It’s possible that I shall make an ass of myself. But in that case one can always get out of it with a little dialectic. I have, of course, so worded my proposition as to be right either way (K.Marx, Letter to F.Engels on the Indian Mutiny)
Wednesday, May 06, 2020
Lyin' eyes: Butterfly, moth eyespots may look the same, but likely evolved separately
FLORIDA MUSEUM OF NATURAL HISTORY
IMAGE: DOSES OF THE BLOOD THINNER HEPARIN ALTERED THE EYESPOT PATTERNS IN IO AND POLYPHEMUS MOTHS. THE FACT THAT THE TWO SPECIES RESPONDED DIFFERENTLY TO HEPARIN SUGGESTS THAT WING PATTERN DEVELOPS... view more
CREDIT: ANDREI SOURAKOV/FLORIDA MUSEUM
GAINESVILLE, Fla. --- The iconic eyespots that some moths and butterflies use to ward off predators likely evolved in distinct ways, providing insights into how these insects became so diverse.
A new study manipulated early eyespot development in moth pupae to test whether this wing pattern develops similarly in butterflies and moths. The results suggest that the underlying development of eyespots differs even among moth species in same family, hinting that moths and butterflies evolved these patterns independently.
Influencing how eyespots form can lead to a better understanding of the respective roles genetics and the environment play in moth and butterfly wing patterns, said lead author Andrei Sourakov.
"Moths stumbled on a very successful evolutionary design over 200 million years ago," said Sourakov, collections coordinator of the Florida Museum's McGuire Center for Lepidoptera and Biodiversity. "That's a long time for evolution to take place. It's easy to assume that things that look the same are the same. But nature constantly finds a way of answering the same question with a different approach."
Sourakov and co-author Leila Shirai, a biologist at the University of Campinas in Brazil, analyzed eyespot development in io and polyphemus moths, two species in the Saturniidae family. The eyespots in the two species responded differently to the study's treatments, though the findings suggest the same signaling pathways were active. The researchers also found moths' wing pattern development, which begins when they are caterpillars, slows just after they enter their pupal stage, a finding that echoes previous butterfly research.
Honing in on the signaling pathways involved in eyespot development - the molecular cascade that produces pigmentation and pattern in moths and butterflies - is central to determining the similarities and differences between moth and butterfly development, Sourakov said. Looking at DNA isn't enough. Instead, scientists need to determine what happens after a gene is expressed to see if seemingly identical wing patterns truly are the same.
"Genetically controlled variation can look identical to environmentally induced variation," Sourakov said. "Variation isn't really produced by genes themselves, but by the intermediate product of the gene - in this case, molecular pathways."
Sourakov and Shirai's research expands on a 2017 study by Sourakov that showed molecules in the blood thinner heparin influenced eyespot development in moths.
In the new study, heparin triggered various changes in moth eyespots, including smudging and a shift in proportion. Despite similar molecular interactions, however, the changes were inconsistent between the io and polyphemus moths, potentially due to the different ways their wing patterns are mapped out by genes.
Sourakov and Shirai were able to detect wing development was likely paused just after pupation by delivering varying doses of heparin to caterpillars and pupae at different developmental stages. They also found eyespot tissue transplanted to a different region of the wing during pupation could induce patterning.
Natural history collections are key resources in revealing which wing patterns took hold genetically and became visible in populations, Sourakov said.
"Collections are where it all starts and where it all ends, frankly," he said. "We can generally look at collections as a window into evolution, helping us understand which changes are just lab results and which ones can actually be observed in nature. Variation in genetics and physical characteristics is the toolbox for the evolution of diversity, and diversity is what we study at the museum. Collections help us understand that."
Sustainable recovery of nutrients from urine
Columbia engineers use a membrane-based technique and a closed-loop system to recover ammonia as a valuable fertilizer product while simultaneously removing it as a pollutant from waste streams
COLUMBIA UNIVERSITY SCHOOL OF ENGINEERING AND APPLIED SCIENCE
IMAGE: URINE, WHICH CONTAINS MOST THE NITROGEN EXCRETED BY HUMANS, CAN BE ISOLATED AT THE SOURCE VIA DRY URINALS AND URINE-DIVERSION TOILETS. THROUGH ISOTHERMAL MD, VOLATILE AMMONIA IN HYDROLYZED URINE IS... view more
CREDIT: NGAI YIN YIP AND CHANHEE BOO/COLUMBIA ENGINEERING
New York, NY--May 6, 2019--Ammonia is a key component of fertilizer and vital in supporting plant growth and ultimately providing food for populations around the world. It is also a major pollutant that, after it is used in the food chain, enters municipal wastewater treatment plants where it is often not adequately removed. It is then released into the environment where it pollutes aquatic settings and damages ecosystems, triggering destructive algal blooms, dead zones, and fish kills.
Ammonia capture is now a critical challenge for the 21st century, especially as city populations are expected to increase dramatically, with a projected urban growth of 2.5 billion people by 2050. At the same time, providing improved sanitation to the 2.3 billion people who are currently unserved globally will entail the installation of new toilets, wastewater facilities, and sanitation infrastructure, putting even more stress on the environment.
To date, most ammonia capture is done through an extremely energy-intensive technique, the Haber-Bosch process, which is used by industry across the globe to produce fertilizer and accounts for 1-2% of the world's annual energy consumption. A Columbia Engineering team, led by Ngai Yin Yip, assistant professor of earth and environmental engineering, reports today that they have recovered ammonia through a new method that uses a very low level of energy, approximately a fifth of the energy used by the Haber-Bosch process. In addition, because the technique recycles ammonia in a closed loop, the ammonia can be recaptured for reuse in fertilizer, household cleaners, and other industrial products. The findings are published today by ACS Sustainable Chemistry & Engineering.
The management of nitrogen, an essential nutrient for life, has been recognized by the National Academy of Engineering as one of the Grand Challenges of the 21st century. Yip's group, which focuses on advancing sustainable production of both energy and water, wanted to invent a better, more ecological way to produce nitrogen, of which ammonia is a bioavailable form.
"It was clear that we needed a paradigm shift to transition to a circular economy model, where nitrogen is recovered and recycled, instead of the current unsustainable linear approach of costly production, utilization, and then discarding pollutants to the environment," Yip says.
Yip's team has expertise in membrane distillation, a technique that drives the permeation of volatile species, in this case, ammonia, from a feed stream to a collector stream, while the non-volatile species remain in the feed stream. The volatile species are driven across the membrane by a difference in vapor pressure, which is dependent on temperature and concentration. The researchers developed a technique, which they call "isothermal membrane distillation with acidic collector," or IMD-AC, that uses low-temperature heat, and applied it to selectively separate and capture ammonia from the ammonia-rich waste stream of urine (simulated for this project).
"Because our process is driven by moderate temperatures as low as 20-60 degrees Celsius, the energy can be supplied by cheap or even free waste heat from, for instance, cooling tower water, bath water, or solar thermal collectors," Yip says.
Next steps for the team include exploring ways to recover phosphorus, another key ingredient of fertilizer, sustainably and cheaply from urine.
"Now that we've demonstrated the sustainable recovery of nitrogen from urine," Yip adds, "we think that the growing population and sanitation trends present ideal opportunities for the introduction of decentralized urine diversion facilities for nutrient recovery, without costly retrofits or overhauls of the existing system, shifting wastewater management to a more sustainable and efficient paradigm."
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About the Study
The study is titled "Novel Isothermal Membrane Distillation with Acidic Collector for Selective and Energy-Efficient Recovery of Ammonia from Urine."
Authors are: Stephanie N. McCartney, Natalie Williams, Chanhee Boo, Xi Chen, and Ngai Yin Yip, (Department of Earth and Environmental Engineering, Columbia University; Yip is also a member of the Columbia Water Center).
The study was supported by the National Science Foundation INFEWS Award (#1903705).
The authors declare no financial or other conflicts of interest.
Columbia Engineering, based in New York City, is one of the top engineering schools in the U.S. and one of the oldest in the nation. Also known as The Fu Foundation School of Engineering and Applied Science, the School expands knowledge and advances technology through the pioneering research of its more than 220 faculty, while educating undergraduate and graduate students in a collaborative environment to become leaders informed by a firm foundation in engineering. The School's faculty are at the center of the University's cross-disciplinary research, contributing to the Data Science Institute, Earth Institute, Zuckerman Mind Brain Behavior Institute, Precision Medicine Initiative, and the Columbia Nano Initiative. Guided by its strategic vision, "Columbia Engineering for Humanity," the School aims to translate ideas into innovations that foster a sustainable, healthy, secure, connected, and creative humanity.
Workers happy despite crisis and uncertainty
UNIVERSITY OF ZURICH
In general, workers in Switzerland and Germany are coping well with the Covid-19 crisis and the associated social disruption. They are feeling happier and finding it easier to unwind and balance work and private life. They are also more engaged at work than last year, a survey among 600 participants carried out by researchers of the University of Zurich shows.
Workers are currently having to be very flexible: They must come to terms with a new situation at work and changes in their workload, they may have to take on additional childcare duties, and they are facing an uncertain future. Occupational health researchers at the Epidemiology, Biostatistics and Prevention Institute of the University of Zurich have examined the effects these challenges have had on the workers' well-being and health.
Pre- and post-outbreak comparison
The researchers conducted a survey in April 2020 among almost 600 workers who had already participated in a survey in June 2019 about their work conditions, well-being and strategies to improve their situation at work and leisure. This enabled the researchers to compare the situation of the survey participants before and after the outbreak of the Covid-19 pandemic. "We had anticipated that workers would feel more stressed during the crisis than before," says study leader Rebecca Brauchli. The study, however, suggests that the opposite is true, "which once again shows how remarkably adaptable people are."
When asked to give a general assessment of their situation, 29 percent of survey participants said that their work situation had deteriorated after the beginning of the Covid-19 crisis, and only 11 percent said that it had improved. These figures were also reflected in the workers' assessment of their private lives. However, this retrospective general assessment did not coincide with the survey findings gained from comparing specific answers before and after the outbreak of the pandemic.
Work and life in balance
When it comes to specific answers, the researchers found that workers are happier with their professional and private lives than one year ago, and that both spheres of life are perceived as more enriching. According to the survey, the workers are now able to expand their professional skills and learn new things. They feel more supported by their colleagues in their private life and, above all, are better able to control how and when they work. This autonomy in carrying out their work is likely also a reason why workers are currently better at maintaining a balance between work and private life. "There are fewer conflicts between work and private life," says Brauchli. "Significantly so, when it comes to people working from home." They are more actively shaping their free time and work-life balance than a year ago. The same goes for workers affected by short-time working.
More engaged, more relaxed, but less optimistic
In general, survey participants said they were better able to unwind from work. The general workload has decreased slightly, as have signs of burnout. "However, this doesn't mean that workers have been less engaged at work," emphasizes Brauchli. Quite the opposite, in fact: Across all groups, workers have been significantly more engaged at work.
The survey shows a slight deterioration when it comes to the workers' assessment of their own psychological and physical health. According to Brauchli, it is worth taking a closer look at the specific questions here. In terms of their own optimism and feeling of being close to others, respondents gave significantly lower ratings than in the previous survey. Physical exercise also decreased somewhat, in frequency and especially in intensity. At the same time, the survey respondents felt more relaxed and reported being able to think more clearly.
Greater burden for workers looking after children
Despite the generally positive developments in the professional and private lives of workers, the researchers found some exceptions in subgroups, especially among workers who also take care of small children. In contrast to other groups, these workers feel a slightly increased burden at home. Unlike the other survey respondents, they are not benefiting from the recreational effects and reduced workload, and generally feel less supported by their colleagues than a year ago. The latter, with slight variation, also applies to people working from home: They are more likely to be overwhelmed in terms of work content, "probably because they lack the support of their line managers or colleagues when facing a problem," suspects Rebecca Brauchli.
Favorable effects of flexibility and autonomy
Workers report feeling unsettled and steamrollered by recent events, which according to Brauchli could be a reason for their slightly downbeat overall retrospective assessment: "As the world has gone awry, they probably don't really trust their own positive feelings." A comparison of their answers to specific questions from one year ago and now, however, shows that many workers are significantly happier with their professional and private lives, and are mostly benefiting from the slower pace of life and resulting calm. "Increased flexibility and autonomy in particular appear to have a positive effect on the worker's well-being," says Brauchli. "This could also be something we can learn from for the future of work."
Composition of sample
The survey was conducted among 597 workers (54% men and 46% women) in Switzerland and Germany, with an average age of 49. 4% of survey respondents hold an executive role, and 24% are line managers. 29% live alone, 68% with a partner or their family, and 3% in a shared flat or house. 44% do not have to take care of children or other people, while almost 25% have at least one child under the age of 20. Around one quarter of survey participants were affected by short-time working. Workload has increased for 11% and decreased for 34% of respondents since the beginning of the crisis. While 24% worked from home to at least some extent before the crisis, this figure rose to 45% after the outbreak of the pandemic. For 17% of respondents, childcare duties have increased since the beginning of the crisis.
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TRANSHUMANISM
Controlling your home by the power of thought
DEUTSCHES PRIMATENZENTRUM (DPZ)/GERMAN PRIMATE CENTER
Walking across the room to switch on a light - such a simple everyday activity involves enormously complex computations by the brain as it requires interpretation of the scene, control of the gait and planning upcoming movements such as the arm movement to the light switch. Neuroscientists at the German Primate Center (DPZ) - Leibniz Institute for Primate Research have now investigated in which brain areas the movements are coded for reaching distant targets that require both arm and walking movements, and how the movements are planned in the brain before execution. For this purpose, they have created a novel experimental environment, the "Reach Cage". First results with rhesus monkeys show that distant movement targets, which the animals have to walk to, are encoded in the same areas of the brain as close targets, even before the animal starts walking. This means that movement goals, near and far from the body, can be obtained from the same brain areas no matter if the goal requires walking or not. These findings could be harnessed to develop brain-machine interfaces that control smart homes (eLife).
Our highly developed nervous system enables versatile and coordinated movement sequences in complex environments. We only notice the impact on our daily life when we are no longer able to perform certain actions, for example, as a result of a paralysis caused by a stroke. A novel approach to put the patient back in control would be brain-computer interfaces that are able to read signals from the brain. Such signals can be used as control signals not only for neuroprosthetic devices, which aim at directly replacing the lost motor function, but also for any computerized devices such as smartphones, tablets or a smart home.
The development of brain-computer interfaces builds on decades of basic research on the planning and control of movements in the cerebral cortex of humans and animals, especially non-human primates. Up to now, scientists performed such experiments mostly to investigate the planning of controlled hand and arm movements to nearby targets within immediate reach. However, those experiments are too constrained to study action planning in large realistic environments, such as a one's home. For example, turning on the light switch on the opposite wall involves different types of overlapping movements with coordination of multiple parts of the body.
Experimental constraints so far prevented scientists from studying neural circuits involved in action planning during whole-body movements, since animals must be able to move freely during the brain recordings. Observing a combination of walking and reaching movements, such as in the case of distant targets, required a completely new experimental environment that was not available yet. The so-called "Reach Cage" provides a test environment that allows to register and interpret the movement behavior, and to link it to the related brain activity while the animals are able to move freely under highly controlled conditions.
For the experiment, two rhesus monkeys were trained to touch targets close to or distant from their body. For distant targets, a walking movement was required to bring the target within reach. Illumination of individual targets instructed the animals which target they should touch. Using multiple video cameras, the movements were observed in 3D with high temporal and spatial precision. So called deep-learning algorithms were used to automatically extract the movements of their head, shoulder, elbow and wrist in 3D from the video images. Simultaneously, brain activity was recorded wirelessly so that the animals were not restricted in their movements at any time. By measuring the activity of hundreds of neurons from 192 electrodes in three different brain regions, it is now possible to draw conclusions about how movements are planned and executed in parallel.
Over the course of the training the monkeys performed reaching and walking movements with increasing confidence and optimized their behavior to reach high precision even when the targets were at a greater distance. "In the video analysis we can track the movements very accurately. The wirelessly recorded brain signals are so precise and clear that the activity of individual neurons can be studied and linked to behavior", says Michael Berger.
The results show that motor planning areas of the brain process information about the goal of specific movements even if the goal is at the other end of the room and a whole-body movement is first required to get there. Alexander Gail, head of the Sensorimotor Group, adds: "Such knowledge is not only important to understand the deficits of patients who have difficulty in planning and coordinating actions. The new insights also might turn out particularly useful when developing brain-computer interfaces for controlling smart homes for which goals, such as doors, windows or lights, are distributed throughout a complex environment."
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This research is part of "Plan4Act", an EU-funded project to develop brain-machine interfaces for smart homes with project partners in Germany, Spain and Denmark.
Solar and wind energy sites mapped globally for the first time
UNIVERSITY OF SOUTHAMPTON
IMAGE: THIS IS A WIND FARM IN CAITHNESS, SCOTLAND. view more
CREDIT: SEB DUNNETT
Researchers at the University of Southampton have mapped the global locations of major renewable energy sites, providing a valuable resource to help assess their potential environmental impact.
Their study, published in the Nature journal Scientific Data, shows where solar and wind farms are based around the world - demonstrating both their infrastructure density in different regions and approximate power output. It is the first ever global, open-access dataset of wind and solar power generating sites.
The estimated share of renewable energy in global electricity generation was more than 26 per cent by the end of 2018 and solar panels and wind turbines are by far the biggest drivers of a rapid increase in renewables. Despite this, until now, little has been known about the geographic spread of wind and solar farms and very little accessible data exists.
Lead researcher and Southampton PhD student Sebastian Dunnett explains: "While global land planners are promising more of the planet's limited space to wind and solar energy, governments are struggling to maintain geospatial information on the rapid expansion of renewables. Most existing studies use land suitability and socioeconomic data to estimate the geographical spread of such technologies, but we hope our study will provide more robust publicly available data."
While bringing many environmental benefits, solar and wind energy can also have an adverse effect locally on ecology and wildlife. The researchers hope that by accurately mapping the development of farms they can provide an insight into the footprint of renewable energy on vulnerable ecosystems and help planners assess such effects.
The study authors used data from OpenStreetMap (OSM), an open-access, collaborative global mapping project. They extracted grouped data records tagged 'solar' or 'wind' and then cross-referenced these with select national datasets in order to get a best estimate of power capacity and create their own maps of solar and wind energy sites. The data show Europe, North America and East Asia's dominance of the renewable energy sector, and results correlate extremely well with official independent statistics of the renewable energy capacity of countries.
Study supervisor, Professor Felix Eigenbrod of Geography and Environmental Science at the Southampton comments: "This study represents a real milestone in our understanding of where the global green energy revolution is occurring. It should be an invaluable resource for researchers for years to come, as we have designed it so it can be updated with the latest information at any point to allow for changes in what is a quickly expanding industry."
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Notes to Editors
1) The paper Harmonised global datasets of wind and solar farm locations and power DOI: 10.1038/s41597-020-0469-8 is published in the Nature journal Scientific Data and can be found at: https://go.nature.com/2Wfoicj
2) The University of Southampton drives original thinking, turns knowledge into action and impact, and creates solutions to the world's challenges. We are among the top 100 institutions globally (QS World University Rankings 2019). Our academics are leaders in their fields, forging links with high-profile international businesses and organisations, and inspiring a 22,000-strong community of exceptional students, from over 135 countries worldwide. Through our high-quality education, the University helps students on a journey of discovery to realise their potential and join our global network of over 200,000 alumni. http://www.southampton.ac.uk
Public health training in climate change: What are prospective employers thinking?
COLUMBIA UNIVERSITY'S MAILMAN SCHOOL OF PUBLIC HEALTH
May 4, 2020 -- Researchers at Columbia University Mailman School of Public Health found that 92 percent of employers who responded to a survey on climate change and public health reported need for public health professionals with training in climate change will very likely increase in the next 5 to 10 years. While graduates of public health programs who focus on climate change are in demand in the current job market as well, these positions appear to be just a small proportion of the total number of jobs available in the field of public health. The findings are published online in the International Journal of Environmental Research and Public Health.
"It is clear from our analysis that current employers value a host of skills and competencies such as knowledge of climate mitigation, health equity and climate justice, pollution-health consequences and causes, risk assessment, and policy analysis, among others," said Heather Krasna, MS, assistant dean and director, Career Services at Columbia Mailman School. "At the same time, we recognize that predicting future workforce needs with historical data or surveys does not give a complete picture of the disruptive reality created by climate change. We cannot model the emerging future from prior trends only, but also must adopt new paradigms of education."
The researchers analyzed 16 years' worth of public health job postings for their projections of the skills needed for this future workforce using keyword searches, and survey responses from prospective employers of public health graduates focusing on climate change. In addition to searching keywords or a combination of terms on Indeed.com and LinkedIn, the authors were provided access to 32,093 job postings on the free job board managed by the Association of Schools and Programs of Public Health (ASPPH). The researchers found a statistically significant increase in the number of jobs in the ASPPH job board which mentioned climate change or global warming over the last 16 years.
A search of keywords "climate change" OR "global warming" on Indeed.com in mid-December 2019, found 2423 results, of which 159 also mentioned "public health." Thus, approximately 6.6 percent of the search results on the job board related to climate change had an overlap with public health (159 of 2423). An Indeed.com search for ("public health" OR "environmental health" OR epidemiology OR "health policy") in late December, found 37,490 public health-related jobs, of which approximately 0.4 percent also mentioned climate change or global warming. Using the National Cancer Institute's SOCcer (Standardized Occupation Coding for Computer-assisted Epidemiological Research) system the researchers analyzed organizations, job titles and descriptions.
To assess the views of current employers who are likely to need candidates with training in both public health and climate change, the researchers consulted with experts in both climate change and public health education, and included survey questions regarding specific competencies based on the current curriculum of Columbia University's Climate and Health Certificate program.
"For those institutions creating new training programs focusing on both climate change and public health, it will be important to assess whether their graduates will be in demand in the labor market, and if so, which sectors are most interested in hiring candidates with these skills," noted Krasna.
While the Mailman School research team describes the current state of the job market for public health graduates with climate change training as "emerging," there are relatively few roles currently available specifically for a graduate with a master's level public health degree and a focus in climate change. Notwithstanding, it is likely that graduates would benefit from training in climate change-related competencies, they noted, especially as we face the enormity of unpredictable global issues such as climate change.
"The scope and framing of our study focused primarily on the role of educational institutions in preparing graduates to solve the problems of today, and to meet the demands of today's employers," said Krasna. "However, we believe that universities provide much more than education, research, and service to their communities; they also take on an essential role moving our world toward sustainability."
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Co-authors are Katarzyna Czabanowska, Maastricht University; Shan Jiang, Simran Khadka, Haruka Morita, Julie Kornfeld and Jeffrey Shaman, Columbia Mailman School of Public Health.
Columbia University Mailman School of Public Health
Founded in 1922, the Columbia University Mailman School of Public Health pursues an agenda of research, education, and service to address the critical and complex public health issues affecting New Yorkers, the nation and the world. The Columbia Mailman School is the seventh largest recipient of NIH grants among schools of public health. Its nearly 300 multi-disciplinary faculty members work in more than 100 countries around the world, addressing such issues as preventing infectious and chronic diseases, environmental health, maternal and child health, health policy, climate change and health, and public health preparedness. It is a leader in public health education with more than 1,300 graduate students from 55 nations pursuing a variety of master's and doctoral degree programs. The Columbia Mailman School is also home to numerous world-renowned research centers, including ICAP and the Center for Infection and Immunity. For more information, please visit http://www.mailman.columbia.edu.
Study shows how microorganisms survive in harsh environments
U.S. ARMY RESEARCH LABORATORY
IMAGE: IN NORTHERN CHILE'S ATACAMA DESERT, ONE OF THE DRIEST PLACES ON EARTH, MICROORGANISMS LIVE BENEATH THIN LAYERS OF ROCK TO GAIN SOME PROTECTION FROM HARSH WINDS AND SOLAR RADIATION. WATER,... view more
CREDIT: (COURTESY DAVID KISAILUS, UNIVERSITY OF CALIFORNIA - IRVINE)
RESEARCH TRIANGLE PARK, N.C. -- In northern Chile's Atacama Desert, one of the driest places on Earth, microorganisms are able to eke out an existence by extracting water from the rocks they colonize.
An Army-funded project by researchers at the University of California, Irvine, Johns Hopkins University and University of California, Riverside gained an in-depth understanding of the mechanisms by which some cyanobacteria, an ancient group of photosynthetic microbes, survive in harsh environments.
The new insights, published in Proceedings of the National Academy of Sciences, demonstrate how life can flourish in places without much water in evidence - including Mars - and how people living in arid regions may someday be able to procure hydration from available minerals.
"The Army has a strong interest in how microorganisms well-adapted to extreme environments can be exploited for novel applications such as material synthesis and power generation within these harsh fielded environments," said Dr. Robert Kokoska, program manager, Army Research Office, an element of U.S. Army Combat Capabilities Development Command's Army Research Laboratory. "This study provides valuable clues for uncovering the evolved design strategies used by these native desert-dwelling microbes to maintain their viability in the face of multiple environmental challenges."
Through work in the field and laboratory experiments, the research team focused on the interactions of Chroococcidiospsis, a desiccation-resistant species of cyanobacteria that is found in deserts around the world, and gypsum, a water containing calcium sulfate-based mineral. The colonizing lifeforms exist beneath a thin layer of rock that gives them a measure of protection against the Atacama's extreme temperature, high solar irradiance and battering winds.
Co-author Jocelyne DiRuggiero, JHU associate professor of biology, traveled to the remote desert to collect gypsum samples and brought them back to her labs in the United States. She cut small pieces, where microorganisms could be found, and sent them to UCI for materials analysis.
In one of the most striking findings of the study, the researchers learned that the microorganisms change the very nature of the rock they occupy. By extracting water, they cause a phase transformation of the material - from gypsum to anhydrite, a dehydrated mineral.
According to DiRuggiero, the impetus for the published work came when Wei Huang, a UCI post-doctoral scholar in materials science & engineering, spotted data showing an overlap in concentrations of anhydrite and cyanobacteria in the gypsum samples collected in the Atacama.
"Our analysis of the regions of rock where microbes were colonized revealed a dehydrated phase of calcium sulfate, suggesting that they extract water from the rock to survive," said David Kisailus, lead author and UCI professor of materials science & engineering. "We wanted to do some more controlled experiments to validate that hypothesis."
DiRuggiero's team then allowed the organisms to colonize half-millimeter cubes of rocks, called coupons, under two different conditions, one in the presence of water, to mimic a high-humidity environment, and the other completely dry. In the midst of moisture, the gypsum did not transform to the anhydrite phase.
"They didn't need water from the rock, they got it from their surroundings," Kisailus said. "But when they were put under stressed conditions, the microbes had no alternative but to extract water from the gypsum, inducing this phase transformation in the material."
Kisailus' team used a combination of advanced microscopy and spectroscopy to examine the interactions between the biological and geological counterparts, finding that the organisms bore into the material like tiny miners by excreting a biofilm containing organic acids, Kisailus said.
Huang used a modified electron microscope equipped with a Raman spectrometer to discover that the organisms used the acid to penetrate the rock in specific crystallographic directions - only along certain planes where they could more easily access water existing between faces of calcium and sulfate ions.
Kisailus said the project was a great demonstration of interdisciplinary research between microbiologists and materials scientists that may, one day, open doors to other forms of scientific discovery.
"Scientists have suspected for a long time that microorganisms might be able to extract water from minerals, but this is the first demonstration of it," DiRuggiero said. "This is an amazing survival strategy for microorganisms living at the dry limit for life, and it provides constraints
Life on the rocks helps scientists understand how to survive in extreme environments
JOHNS HOPKINS UNIVERSITY
IMAGE: MICROORGANISMS IN GREEN COLONIZE GYPSUM ROCK TO EXTRACT WATER FROM IT. JOHNS HOPKINS AND UCI RESEARCHERS RAN LAB EXPERIMENTS TO UNDERSTAND THE MECHANISMS OF SURVIVAL FOR THESE CYNANOBACTERIA, CONFIRMING THAT... view more
CREDIT: DAVID KISAILUS / UCI
BY STUDYING HOW THE TINIEST ORGANISMS IN THE ATACAMA DESERT OF CHILE, ONE OF THE DRIEST PLACES ON EARTH, EXTRACT WATER FROM ROCKS, RESEARCHERS AT THE JOHNS HOPKINS UNIVERSITY, UNIVERSITY OF CALIFORNIA, IRVINE, AND U.C. RIVERSIDE REVEALED HOW, AGAINST ALL ODDS, LIFE CAN EXIST IN EXTREME ENVIRONMENTS.
A report of the findings published today in Proceedings of the National Academy of Sciences show how life can flourish in places without much water - including Mars, which has an environment similar to the Atacama - and how people living in arid regions may someday be able to procure hydration from available minerals.
"Scientists have suspected for a long time that microorganisms might be able to extract water from minerals, but this is the first demonstration of it," says Jocelyne DiRuggiero, associate professor of biology at the Johns Hopkins University and the paper's co-author.
"This is an amazing survival strategy for microorganisms living at the dry limit for life, and it provides constraints to guide our search for life elsewhere."
The research team focused on Chroococcidiospsis, a species of cyanobacteria that is found in deserts around the world, and gypsum, a calcium sulfate-based mineral that contains water. The colonizing lifeforms exist beneath a thin layer of rock that gives them protection against the Atacama's extreme temperature, battering winds and blistering sun.
DiRuggiero traveled to the remote desert to collect gypsum samples, which she brought back to her lab, cut into small pieces where the microorganisms could be found and sent to David Kisailus, professor of materials science & engineering at UCI, for materials analysis.
In one of the most striking findings of the study, the researchers learned that the microorganisms change the very nature of the rock they occupy. By extracting water, they cause a phase transformation of the material - from gypsum to anhydrite, a dehydrated mineral.
According to DiRuggiero, the study's inspiration came when Wei Huang, a UCI post-doctoral scholar in materials science & engineering, spotted data showing an overlap in concentrations of anhydrite and cyanobacteria in the gypsum samples collected in the Atacama.
DiRuggiero's team then allowed the organisms to colonize half-millimeter cubes of rocks, called coupons, under two different conditions: one in the presence of water, to mimic a high-humidity environment, and the other completely dry. In the presence of moisture, the gypsum did not transform to the anhydrite phase.
"They didn't need water from the rock, they got it from their surroundings," said Kisailus. "But when they were put under stressed conditions, the microbes had no alternative but to extract water from the gypsum, inducing this phase transformation in the material."
Kisailus' team used a combination of advanced microscopy and spectroscopy to examine the interactions between the biological and geological counterparts, finding that the organisms bore into the material like tiny miners by excreting a biofilm containing organic acids, Kisailus said.
Huang used a modified electron microscope equipped with a Raman spectrometer to discover that the organisms used the acid to penetrate the rock in specific crystallographic directions - only along certain planes where they could more easily access water existing between faces of calcium and sulfate ions.
"Does it mean there is life on Mars? We cannot say, but it gives us an idea of how crafty microorganisms can be," says DiRuggiero.
The findings may also help researchers develop other practical applications for defense. "The Army has a strong interest in how microorganisms well-adapted to extreme environments can be exploited for novel applications such as material synthesis and power generation within these harsh fielded environments," adds Robert Kokoska, program manager, Army Research Office, an element of U.S. Army Combat Capabilities Development Command's Army Research Office.
"This study provides valuable clues for uncovering the evolved "design strategies" used by these native desert-dwelling microbes to maintain their viability in the face of multiple environmental challenges."
Funding for this project was provided by the Army Research Office and NASA.
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Already vulnerable, gig economy workers in SF suffer during pandemic, survey finds
Unique in-person survey establishes new baseline, while online survey provides a snapshot of pandemic's effects
UNIVERSITY OF CALIFORNIA - SANTA CRUZ
IMAGE: A NEW SURVEY OF APP-BASED RIDE-HAILING AND FOOD AND GROCERY-DELIVERY WORKERS IN SAN FRANCISCO UNDERSCORES THE FINANCIAL VULNERABILITY OF WORKERS IN THE GIG ECONOMY--AND THE CORONAVIRUS HAS MADE THEIR PLIGHT... view more
CREDIT: UC SANTA CRUZ
A new survey of app-based ride-hailing and food and grocery-delivery workers in San Francisco underscores the financial vulnerability of workers in the gig economy--and the coronavirus has made their plight much worse, according to findings released today (Tuesday, May 5) by researchers at the University of California, Santa Cruz.
The unique, in-person survey reached 643 workers with Uber, Lyft, Doordash, GrubHub, Instacart, and Shipt early this year. When the shelter-in-place order took effect, researchers developed an additional two-week, online survey to capture the effects of the pandemic on app-based workers--a growing population that enjoys little job security and few employment rights.
The baseline survey reveals a workforce that is 56% immigrant, mostly male, and that struggles to make ends meet, with many relying on public assistance despite working an average of 40 hours per week. Since the pandemic, the online survey revealed, more than half have lost 75-100% of their income. The findings were published in a report titled, "On-demand and on-the-edge: Ride-hailing and Delivery Workers in San Francisco."
"This is an incredibly vulnerable workforce, and many were just on the edge before the coronavirus crisis," said lead researcher Chris Benner, a professor of environmental studies and sociology and the director of the Institute for Social Transformation at UCSC. "The crisis has put them over the edge. Because of their employment status, they fall through a lot of cracks in the relief packages that have been approved by the state and federal governments."
The initial survey was conducted over six weeks from February 1 through mid-March. Survey takers recruited participants through the apps themselves by hiring workers and asking if they'd like to participate. The 20-minute survey was administered in person, and those who participated received a $20 gift card. The response rate was 70% among ride-hailing workers and 15% among food-delivery workers.
The outbreak of the coronavirus crisis prompted the research team to pivot to an online survey, which was conducted the second and third weeks of April. Participants were recruited through organized networks, including closed Facebook groups, and a total of 219 app-based workers responded.
"We surveyed the same workforce at two different points in time," said Benner. "The first gives us a picture of these workers under normal work circumstances, and the second is a snapshot of the impacts of COVID on this workforce."
Full-time work but not enough to get by
The baseline survey, which reached 407 ride-hailing workers and 236 food-delivery workers, revealed a workforce on the margins:
21% of participants have no health insurance, and another 30% depend on public insurance sources, such as Covered California or Medi-Cal
15% receive some form of public assistance, including 13% of food-delivery workers who depend on food stamps
45% report they could not handle a $400 emergency expense without borrowing money
Half the participants report working 40 or more hours per week in app-based work, and nearly 40% have worked more than two years for their "survey app"--they app they were working on when recruited for the survey.
"This is not a 'gig.' This is full-time work for the majority of these workers," said Benner. "More than one-third are supporting children and nearly half are supporting other adults."
Respondents reported median weekly earnings of $900 for ride-hailing workers and $500 for food-delivery workers, but those earnings drop considerably when adjusted for expenses such as gas, vehicle service, and cleaning. And the gap between workers' own estimates of expenses, compared to per-mile expenses allowed by the IRS, is considerable: When using the IRS estimates, fully 21% of workers net zero for their labor, said Benner.
"We estimate that twenty percent of ride-hailing workers are actually losing money to drive, when you account for all of their expenses," said Benner.
Impacts of the coronavirus pandemic
Preliminary findings of the online survey, including the drop in income, were shared with the San Francisco Local Agency Formation Commission (SF LAFCo), which commissioned the baseline survey, on April 21.
"With the shelter-in-place order in effect, ride-hailing workers were earning a fraction of what they'd made in February, but these workers were living on the edge financially already, so anything they can bring in is necessary," said Benner.
The coronavirus crisis prompted 18% of surveyed ride-hailing workers to shift to food delivery, but the biggest impact was on those who were not working at all: 24% had stopped working by mid-April, for fear of contracting the virus or other reasons.
Because app-based companies continue to classify their workers as independent contractors, despite the passage in 2019 of California Assembly Bill 5 designed to make them employees, workers are not typically able to access unemployment benefits. Although the federal CARES Act expanded eligibility to some independent contractors, app-based workers have trouble providing the required documentation of their previous earnings, said Benner.
Policy implications
The two-pronged survey results shed light on the needs of app-based workers, particularly in a city like San Francisco, which has some of the most progressive fair-labor standards in the country, said Benner. "These workers need and deserve greater economic security," he said.
Policymakers must ensure that city and state employment laws are enforced, including minimum wage laws, and that ride-hailing and delivery workers have access to health insurance and unemployment benefits, said Benner. He added that the pandemic has exposed a need for improved safety and health protection of workers and paid sick leave, as well as stronger public health protections.
Meanwhile, owners of app-based companies are backing a ballot initiative that would exempt them from employer regulations. "At a time when these companies should be providing sanitizer, gloves, masks, and information about how to prevent the spread of the virus, they haven't been, because that would undermine their claim that these workers aren't their employees," said Benner. "Food and grocery delivery has been deemed essential work, and these workers are putting themselves at risk, but they are not getting adequate support or protection."
Assessing workers in the gig economy
The surge of app-based workers has raised questions about their well-being, their relationship to the companies they work for, and the future of the labor force. The baseline survey is among the most robust efforts to assess the circumstances of ride-hailing and grocery and meal-delivery workers.
"A survey like this is extremely rare, because it's expensive and labor-intensive," said Benner. "We paid the surveyors and the cost of the ride and meal, regardless of whether the worker was willing to participate in the survey." Benner acknowledged support from the San Francisco Foundation, ReWork the Bay, the Ford Foundation, the Annie E. Casey Foundation, Chavez Family Foundation, and SF LAFCo.
The survey was administered by UC Santa Cruz in partnership with San Francisco Jobs With Justice, Jobs With Justice Education Fund, and the Driver's Seat Cooperative. SF LAFCo commissioned the research. "This is a true example of community-engaged scholarship," said Benner.
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Winter warm spells see an increase in duration and frequency in UK temperature records
Warm winter spells have increased in frequency and duration two- to three times over since 1878, according to scientists led by the University of Warwick
UNIVERSITY OF WARWICK NEWS RELEASE 6-MAY-2020 PROFESSOR SANDRA CHAPMAN OF THE UNIVERSITY OF WARWICK DEPARTMENT OF PHYSICS. view more CREDIT: UNIVERSITY OF PHYSIC
Analysis of historical temperature data led by University of Warwick shows warm spells in winter occurring more often and for longer periods Uses over a hundred years of data from the Central England Temperature (CET) record Has implications for ecology, sustainability and agriculture
Warm winter spells have increased in frequency and duration two- to three times over since 1878, according to scientists led by the University of Warwick.
In a new analysis of historical daily temperature data published in the Journal of Applied Meteorology and Climatology, scientists from the Department of Physics at the University of Warwick, the British Antarctic Survey, and at the London School of Economics and Political Science examined data from the Central England Temperature (CET) record, the longest available instrumental record of temperature in the world. They focused on warm spells during the winter months, defined as sustained periods of time above a fixed temperature threshold.
The conclusions do not rely on identifying and counting winter warm spells directly but instead use observations of daily temperatures to show how the likelihood of different temperatures has changed. By applying a method called crossing theory to these probabilities, the scientists have provided information on the changing relationship between frequency, duration and intensity of these warm spells.
The researchers focused on the maximum daily temperatures in December, January and February in observations from 1878. Week-long warm intervals that return on average every 5 years now consistently exceed 13 degrees C. In the 1850s, a winter warm spell lasting more than 5 days with a daily maximum temperature above 12-13°C would typically take at least 5 years to reoccur. Nowadays they occur more often, typically every 4 years or less.
Climate variability is expected to increase as the global climate warms, and the increase of extended warm spells during winter can have an important impact on agriculture and the sustainability of ecosystems. However, ecosystems are not uniformly sensitive to changes at different temperatures. They are instead vulnerable to changes around critical temperature thresholds and these thresholds may be far from the distribution mean.
Lead author Professor Sandra Chapman of the University of Warwick Department of Physics said: "Our results show that it is possible to focus on warm spells above specific temperature thresholds that are critical for individual species and ecosystem functioning. It thus can be of direct value in supporting our understanding and assessment of climate change impacts.
Professor Stainforth from the Grantham Research Institute at the London School of Economics and Political Science said: "Sustained periods of warm weather can have a significant impact on agriculture and ecosystems even when they don't involve record-breaking extremes. The changing frequency and characteristics of such events may have substantial impacts and this new work demonstrates a novel and flexible method for deducing how they are changing. It provides a valuable new approach for studying the less obvious consequences of climate change."
Professor Eugene Murphy, Science Leader of the Ecosystems Team at British Antarctic Survey said: "Unusually extended periods of warm weather in winter can disrupt biological processes causing changes in the development of populations of plants and animals during the following spring. These changes can affect the biological balance that sustains ecosystems and the diverse biological communities they support, potentially reducing their resilience and capacity to cope with future change."
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* 'Trends in Winter Warm Spells in the Central England Temperature Record' is published in Journal of Applied Meteorology and Climatology, DOI: 10.1175/JAMC-D-19-0267.1
