Wednesday, October 30, 2024

 

New genetic web tool to help restore climate-resilient marine ecosystems




Flinders University
Dr Georgina Wood 

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Flinders University researcher Dr Georgina Wood diving on crayweed restoration site in Sydney, NSW.

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Credit: Photo courtesy John Turnbull





In the face of increased human pressures and climate change, a team of Australian scientists led by Dr Georgina Wood at Flinders University have launched a new online tool to assist marine managers and restoration experts to bolster the resilience of marine habitat-forming species.

The ‘Reef Adapt’ initiative, developed by experts from the NSW Department of Primary Industries and Regional Development (NSW DPIRD), Flinders University and The University of Western Australia (UWA), aims to expand the tools available to promote diverse, adaptable and resilient ecosystems.

Described in a new article in Communications Biology, Reef Adapt harnesses genetic data from diverse marine species – including key reef-building corals and habitat-forming kelps, but with scope to expand to other taxa – to map out areas likely to harbour populations adapted to current and future environmental conditions.

The innovative web platform is designed for the rapid inclusion of genetic, biophysical and environmental data into planning of marine restoration and assisted conservation initiatives.

The tool provides users with maps that identify areas with populations suited to their specific restoration sites under current and future climate scenarios. The platform will initially house data for 27 species collected from 420 sample locations across the globe. Users will also be able to upload their own data to the site, further supporting the conservation of other species and areas.

While guidelines for terrestrial ecosystem restoration seed-sourcing exists, for example, the US National Seed Strategy and Australia’s Florabank, Reef Adapt is one of the first tool of its kind for marine environments.

The project follows similar projects on land, such as Australia’s NSW Restore and Renew program, to remove barriers of access to genetic data and improve restoration and assisted gene flow

Dr Georgina Wood, an Australian Research Council Early Career Industry  Fellow with Flinders University and Adjunct Research Fellow at UWA, says global efforts to restore ecosystems are intensifying, including the Convention on Biological Diversity’s recent adoption of the Kunming-Montreal Global Biodiversity Framework which aims to put 30% of degraded ecosystems under effective restoration by 2030.

“Alongside the increase in scale of marine restoration projects, there is a need ensure that restoration practices keep up with the latest available science, including the use of cutting-edge genomic information to make informed decisions about where to source restoration stock material,” says researcher Dr Wood

“Our world is changing now more rapidly than ever before. Ideally, every restoration project would incorporate climate adaptation into their design, but the data needed for this are typically difficult to access. Reef Adapt puts this information directly into the hands of both managers and practitioners,” she says.

The easy-to-use web platform hosts vital genetic information for government, not-for-profit and community organisations – removing barriers of access to vital information that the team hopes will improve both immediate and long-term restoration outcomes.   

Dr Melinda Coleman, NSW DPIRD Senior Principal Research Scientist, says the Reef Adapt online webtool will help guide marine restoration and assisted adaptation programs now and into the future.

“The revolutionary new Reef Adapt tool will use cutting-edge genomic data and seascape analyses to help marine managers, restoration practitioners and other stakeholders including aquaculture make informed decisions about where to source stock for restoration or aquaculture as well as help select climate proof stock that will withstand future ocean conditions,” explains says Dr Coleman.

“We hope that this webtool will be used broadly across marine and conservation managers, community groups or anyone embarking on marine restoration as well as aquaculture proponents.”

Dr Wood says the new Nature article and user manual give examples, with several case studies of ecologically and evolutionarily diverse taxa, including the staghorn coral (Acropora kentii), cauliflower coral (Pocillopora damicornis), golden kelp (Ecklonia radiata) and crayweed (Phyllospora comosa).

Development of the tool required collection of almost 10,000 reference data points from published population genetic literature, as well as a suite of environmental data and oceanographic models.

The article, ‘Reef Adapt: A tool to inform climate-smart marine restoration and management decisions’ (2024) by GV Wood (Flinders), KJ Griffin (UWA), M van der Mheen (UWA), MF Breed (Flinders), JM Edgeloe (UWA), C Grimaldi (UWA / Australian Institute of Marine Science, Perth), A Minne (UWA), I Popovic (University of Queensland), K Filbee-Dexter (UWA / Institute of Marine Research, Norway), MJH van Oppen (Australian Institute of Marine Science, Townsville / University of Melbourne), T Wernberg (UWA / Institute of Marine Research, Norway) and MA Coleman (UWA / NSW DPI, Fisheries) has been published in Communications Biology DOI: 10.1038/s42003-024-06970-4.

Videos and photos: Please credit video courtesy Stefan Andrews from Great Southern Reef Foundation. Photo  captions included.

Dr Georgina (‘George’) Wood will present on the use of digital tools to progress marine restoration at the 10th Western Society of Naturalists’ annual meeting in Oregon, US in November.

 

Turning silver to gold: A diacetylene derivative-based metallic luster materials



Researchers developed a sustainable metal-free material that changes its color under external stimulus




Chiba University

From silver to gold luster 

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UV irradiation of diacetylene crystals obtained by forming a unique array structure changes the luster from silver to gold.

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Credit: Michinari Kohri from Chiba University




Societies of the past and present have given high regard to precious metals like gold and silver. Both metals remind us of nobility and luxury. However, they are quite expensive, which restricts their applications. Therefore, materials with attractive but artificial gold- and silver-like metallic lusters are popular, finding use in jewelry, reflective materials, inks, and cosmetics.

 

Unfortunately, typical metallic luster materials cause environmental harm, rendering them unsustainable. Thus, scientists are actively searching for metal-free alternatives. In this direction, the research fraternity has examined organics such as thiophene, pyrrole, porphyrin, azobenzene, and stilbene derivatives and found some success in creating materials whose colors can be tuned by external stimuli while maintaining the metallic luster. However, the task still remains challenging.

 

Recently, a group of researchers from Chiba University, led by Professor Michinari Kohri and Kyoka Tachibana from the Graduate School of Engineering, in collaboration with scientists from Mitsubishi Pencil Co., Ltd., Tokyo University of Science, Keio University, and Yamagata University, has demonstrated the preparation of a metallic luster material that changes color from silver to gold under UV irradiation. Their findings were published in ACS Applied Materials & Interfaces on September 14, 2024.

 

Highlighting the motivation behind this study, Prof. Kohri says, “Expanding on our earlier findings on biomimetic metallic luster materials, we conducted a targeted search for molecular structures capable of transitioning between silver and gold. This effort resulted in the identification of a novel material with desirable properties.”

 

In this study, researchers developed diacetylene (DA) derivative-based luster materials incorporating stilbenes via linkers at both ends, denoted as DS-DAn (where n represents the linker carbon number, ranging from 1 to 6). Varying n yielded diverse metallic luster and color change behaviors.

 

After several innovative experimental trials, the researchers observed that the stacked structure of platelet crystals comprising DS-DA1, the derivative with the shortest linker carbon chain, had a silver look. Its luster notably turned to gold upon UV irradiation, a remarkable external stimulus-based behavior. The team attributed this to the unique crystal structure of DS-DA1 with two coexisting assembled states, revealing that partial topochemical polymerization (a polymerization method performed by monomers that are aligned in the crystal state) of DA within the structure modified its color tone from silver to gold.

 

The silver luster material developed in this study can express a golden luster selectively in specific areas using only light irradiation. It is also possible to add gradation colors of gold and silver. Thus, it has the potential to be useful in a variety of applications, such as decorative items, printing inks, and cosmetics.

 

“By eliminating metal components, our innovative material minimizes environmental footprint and weight. Moreover, its suitability for UV laser-based drawing techniques opens up new possibilities for high-end decorative printing. Further exploration of molecular structures may make it possible to express a wider variety of glossy colors,” concludes Prof. Kohri, optimistically.  

In summary, this work advances the fundamental science of DA polymerization and unlocks new opportunities for metallic luster materials with desirable properties in photomask patterning and UV laser lithography.

 

 

About Professor Michinari Kohri
Michinari Kohri obtained a Ph.D. in Engineering from Tohoku University in 2007. He currently holds the title of Professor at the Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University. His research is centered around polymer chemistry, colloid chemistry, and functional materials, with a particular focus on structural colors, biomass upcycling, and soft magnetic materials. He has published over a hundred papers on these topics and is a member of various scientific societies, including The Chemical Society of Japan, The Society of Polymer Science (Japan), and The Japanese Liquid Crystal Society.

 

New study shows that university students experienced increased psychological distress during COVID-19, but utilized fewer support services



Underrepresented students, particularly women of color, were less likely to receive mental health services during the pandemic



George Mason University

Elaine C. Russell, MPH 

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Elaine C. Russell, MPH

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Credit: Elaine C. Russell, MPH





PhD in Public Health candidate Elaine Russell and her mentor Kenneth Griffin, professor in the department of Global and Community Health, in George Mason University’s College of Public Health, worked with Tolulope Abidogun, also a PhD in Public Health student, and former Global and Community Health professor Lisa Lindley, now of Lehigh University, to analyze data from the American College Health Association National College Health Assessment (ACHA-NCHA III) in an effort to understand how university students’ mental health needs changed during the COVID-19 pandemic.

“More U.S. college students suffered from mental health concerns during the pandemic, but fewer received necessary mental health treatment,” says Russell.

This study is the first to use a national dataset to examine changes in university students’ psychological well-being and their utilization of mental health services from pre-COVID-19 to peak pandemic. Russell and the research team found that, consistent with prior research related to diverse populations, racial/ethnic, gender, and sexual minority groups were at a greater risk of suffering from poor mental health during the pandemic. Additional findings revealed that during the pandemic, students of color, especially female students of color, were less likely to receive mental health services. 

“When developing innovative approaches to improving mental health outcomes on college campuses, it is important to be culturally sensitive and understand the diverse needs of the specific student population,” says Russell.

The study used data from before the COVID-19 pandemic (Fall 2019 and early Spring 2020) and during the pandemic (Spring 2021) to examine mental health symptoms and utilization of mental health services among university students. The sample was limited to full-time undergraduate students aged 18-24 attending four-year universities in the United States. In addition to analyzing the entire sample of university students, the team examined demographic subgroups based on race/ethnicity, sexual orientation, and gender identity.

Several validated psychological testing scales were used in the study to indicate students’ self-reported levels of psychological distress, loneliness, overall stress, psychological well-being, and resilience. Additional survey questions asked about COVID-19 specific stressors, including the students’ concern over themselves or their loved ones getting COVID-19 and being unable to spend time with the people they care about due to the pandemic lockdowns. Students’ use of mental health services within the 12 months preceding the survey was also assessed.

“These findings are important to better understand sub-groups who disproportionally suffer from severe psychological distress but may not be accessing the necessary care,” the study reports. While issues such as a lack of access to mental health services and discrimination within the healthcare system are undoubtedly factors in students’ reluctance to seek mental health care, the stigma surrounding mental health is also prohibitive.

“Improvements in mental health resources must also address stigma and empower students to access necessary care,” Russell says, specifying the use of peer health educators and making efforts to normalize mental health treatment may be effective prevention strategies.

Russell concludes by calling for future research to increase understanding of the barriers to mental health service use among high-risk university students.

“Impact of the COVID-19 pandemic on university students’ psychological distress, well-being, and utilization of mental health services in the United States: Populations at greatest risk” will be published online in Frontiers in Public Health October 30, 2024.

The authors are: Elaine Cooper Russell, George Mason University; Tolulope M. Abidogun, George Mason University; Lisa L. Lindley, Lehigh University; Kenneth W. Griffin, George Mason University.

About College of Public Health at George Mason University

The College of Public Health at George Mason University is the first College of Public Health in Virginia and a national leader in inclusive, interprofessional, public health research, education, and practice. The College is comprised of public health disciplines, health administration and policy, informatics, nursing, nutrition, and social work. The College offers a distinct array of degrees to support research and training of professionals dedicated to ensuring health and well-being for all. The College’s transdisciplinary research seeks to understand the many factors that influence the public’s health and well-being throughout the lifespan. Areas of focus include prevention and treatment of infectious and chronic diseases, inequalities and marginalized communities, environmental health and climate change, nutrition, violence, mental and behavioral health, informatics, and health technologies. With more than 500 partners, the College serves the community through research, practice, and clinical care with a focus on the social determinants of health and health equity.

The College enrolls more than 1,900 undergraduate and 1,300 graduate students in our nationally-recognized programs, including 5 undergraduate degrees, 7 master’s degrees, and 4 doctoral degrees, and 10 certificate programs. Our graduates are uniquely prepared to thrive in an increasingly multicultural, multidisciplinary, community-focused public health landscape.

 

Researchers aim to spark action to address rising homelessness among older people




To improve services and meet community needs policy makers and other professionals need a clearly defined and comprehensive understanding of what late life homelessness entails



University of Toronto





Homelessness among people over the age of 50 is on the rise, a phenomenon formal housing strategies often overlook -- but researchers from the University of Toronto and McGill hope to prevent this oversight in the future. 

A new study published in The Gerontologist now provides a clear definition of late life homelessness informed by the lives and experiences of older adults. Drawing on interviews with older people who are unhoused and community workers in Montreal, Canada, the researchers aim to spark action and changes in policy and practice.

“We became interested in late life homelessness in 2011 when local service organizations told us that they were witnessing increasing numbers of older people in shelters and that they felt ill prepared to address their complex needs,” says Amanda Grenier, a social work professor at the University of Toronto’s Factor-Inwentash Faculty of Social Work and researcher at Baycrest Hospital. “We soon realized that the experiences of older people were absent from Canadian housing initiatives.”

The researchers’ definition of late-life homelessness points to a host of interconnected systemic issues that restrict access to support and contribute to increased inequalities, exclusion, and unmet needs. For example, the configurations of service for seniors are organized based on age, but people who are unhoused may experience reduced mobility or health concerns in their 50s. At the same time, community services without age criteria can overlook needs that are typically associated with aging. 

The accumulation of disadvantage over time is another factor that defines late-life homelessness. Intersecting forms of oppression are well documented in research on homelessness among younger people, but often overlooked when it comes to older demographics. The researchers point to policy strategies that focus on physical health but ignore the cumulative impact of disadvantages experienced by an individual over time -- due to racism, colonialism or sexism, for example -- making the ability to bounce back from income, housing, or care setbacks a bigger challenge.

Space and place or the built form of our buildings and cities is a third component of what makes late-life homelessness unique. Older people without a residential address face challenges accessing community-based homecare programs. Additionally, programs for those who are homeless often take place in inaccessible settings. Changing mobility needs can impact the physical endurance needed to travel to shelters and safely navigate between spaces of support, leaving older people to age in places that most would consider ‘undesirable’.

The final characteristic of late-life homelessness includes patterns of non-response or inaction on the part of programs and policy that leave older people with histories of homelessness to suffer unmet needs. This includes examples of health and social systems that require clients to have an address and the practice of shuffling older people who are homeless between different programs because those programs aren’t able to address their intersecting needs. 

Grenier and her co-author, Tamara Sussman from McGill University’s School of Social Work, argue that to effectively address late-life homelessness, policy makers and other professionals need a clearly defined and comprehensive understanding of what late life homelessness entails. To this end, they propose the following definition based on research with older people and in community settings:

Late life homelessness is an experience of unequal aging produced through age-based structures and social relations that restrict access to supports, reflect disadvantages over time, is lived in places that are not conducive to aging well and result in exclusion, non-recognition and unmet need.

“While attention to late life homelessness is starting to increase, older people still often remain overlooked in official strategies and policy response,” says Grenier. “Recognition and inclusion will require continued vigilance.”

 

Amanda Grenier is the author of Late-Life Homelessness: Experiences of Disadvantage and Unequal Aging. 

 AMERIKA


Up to half of Medicare beneficiaries lack financial resources to pay for a single hospital stay



American College of Physicians






Below please find summaries of new articles that will be published in the next issue of Annals of Internal Medicine. The summaries are not intended to substitute for the full articles as a source of information. This information is under strict embargo and by taking it into possession, media representatives are committing to the terms of the embargo not only on their own behalf, but also on behalf of the organization they represent.         
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1. Up to half of Medicare beneficiaries lack financial resources to pay for a single hospital stay

Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-24-00787

URL goes live when the embargo lifts          

A nationally representative study of Medicare beneficiaries with modest incomes found that up to half of them may not have sufficient funds to cover out-of-pocket costs associated with a single hospital stay. This financial precarity was more prevalent among Black and Hispanic beneficiaries, beneficiaries with lower levels of education, and those with multiple chronic conditions. The findings are published in Annals of Internal Medicine.

 

Researchers from the University of Pennsylvania Perelman School of Medicine used data from the 2018 wave of the Health and Retirement Study (HRS) to identify Medicare-enrolled respondents who would face financial precarity if exposed to the Medicare Part A hospital deductible of $1,600. The researchers focused on respondents making greater than 100% to 400% or less of the federal poverty level, or the so-called “economic middle” of Medicare recipients. This group includes people who earn too much to qualify for Medicaid but still may qualify for financial assistance in other programs. Financial precarity was defined as having insufficient funds to pay the Medicare hospital deductible and examined across 4 scenarios that considered checking and savings account balances, total liquid assets (with a reserve for future living costs), and supplemental insurance. 

 

The researchers found that between 34.6% and 50.7% of the beneficiaries studied would face financial precarity if hospitalized because they would not have sufficient resources or supplemental insurance to cover associated out-of-pocket costs. While the prevalence of financial precarity varied by scenario, the proportion of beneficiaries who could not pay their hospital bill across all four scenarios exceeded 30%. Considering that just one hospitalization could deplete the financial resources of a large proportion of Medicare beneficiaries, these findings suggest a need to broaden financial protections for those with moderate incomes and limited assets. 

 

Media contacts: For an embargoed PDF, please contact Angela Collom at acollom@acponline.org. To speak with corresponding author Paula Chatterjee, MD, MPH, please email pchat@pennmedicine.upenn.edu.

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2. Novel blood-based screening for colorectal cancer less effective, less cost-effective compared to colonoscopies or stool tests

Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-24-00910

URL goes live when the embargo lifts   

A projected impact and cost-effectiveness analysis estimated reductions in colorectal cancer (CRC) incidence and mortality with novel blood-based and stool-based CRC screening tests versus established alternatives. The results revealed that first-generation novel cell free blood DNA (cf-bDNA) tests have the potential to meaningfully decrease the incidence and mortality of CRC compared with no screening, but substantially less profoundly than colonoscopy or stool tests. The findings can inform the implementation of novel screening methods in clinical practice. This study is published in Annals of Internal Medicine

 

Despite the emergence of multiple noninvasive screening methods, screening adherence among eligible people and follow up colonoscopy rates after an abnormal screen remain low. Researchers from Stanford University School of Medicine and colleagues used the Model of Screening and Surveillance for Colorectal Cancer (MOSIAC) to estimate the long-term clinical and economic impacts of novel CRC screening tests. The researchers compared CRC cases, CRC deaths, quality-adjusted life-years (QALYs), and costs among patients using established screening methods of fecal immunochemical tests (FIT), colonoscopies or multitarget stool DNA test (Exact Sciences Cologuard) vs. four emerging screening methods: two novel cell-free DNA blood tests (Guardant Shield and Freenome), an enhanced, next generation multitarget stool test, and a novel FIT-RNA test (Geneoscopy ColoSense). The researchers modeled idealized 100% adherence and colonoscopy completion after an abnormal noninvasive screening, as well as multiple dimensions of non-ideal participation in CRC screening. They also included the possibility of the blood test being taken by those who consistently declined colonoscopy or stool tests as well as substituting the blood test for other screening alternatives. 

 

The researchers found that assuming 100% participation in all steps of screening, colonoscopy and FIT yielded reductions of more than 70% in CRC incidence and 75% in CRC mortality versus no screening. CRC incidence and mortality reductions were 68% and 73% with a multi-target stool DNA test, and similar rates were found for the enhanced multi-target stool DNA test and FIT-RNA test compared with no screening. The blood tests saw CRC incidence and mortality reductions of 42% and 56%. FIT and colonoscopy were more effective and less costly than blood and multi-target stool DNA tests, and the multi-target stool DNA test was more effective and less costly than the blood test. Participation rates through the various steps in the screening continuum substantially affected the estimated benefits. Achieving blood-based screening among persons unwilling or unable to undergo stool-based screening or colonoscopy improved population-level outcomes.  However, substituting first generation blood-based screening in persons who would otherwise undergo stool-based screening or colonoscopy worsened population-level outcomes.

 

These findings suggest that consideration of all the attributes of novel screening methods, including performance and cost, and the need for colonoscopy follow-up after an abnormal noninvasive screening test must be emphasized when determining the best screening options in clinical settings. 

 

Media contacts: For an embargoed PDF, please contact Angela Collom at acollom@acponline.org. To speak with corresponding author Uri Ladabaum, MD, MS please email Lorraine Benigno Ibana at  libana12@stanford.edu.

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3. Rosuvastatin associated with better cardiovascular and mortality benefits compared to atorvastatin

Abstract: https://www.acpjournals.org/doi/10.7326/M24-0178  

URL goes live when the embargo lifts   

A real-world study comparing the effectiveness and safety of rosuvastatin versus atorvastatin found that initiation of rosuvastatin treatment was associated with slightly lower risks of mortality, major adverse cardiovascular events (MACEs), and major adverse liver outcomes (MALOs). While the differences between treatments are relatively small, clinicians may want to consider these outcomes when prescribing one of these drugs to individual patients. The findings are published in Annals of Internal Medicine.

 

Researchers from Southern Medical University in Guangzhou, China studied data from 285,680 patients using the China Renal Data System (CRDS) and UK Biobank (UKB) databases to compare the real-world effectiveness and safety of rosuvastatin and atorvastatin. The researchers compared all-cause mortality, MACEs, MALOs, development of chronic kidney disease (CKD), development of type 2 diabetes mellitus (T2DM) and occurrence of other statin-related adverse effects between the two treatments using nationally available data. The researchers found that compared with atorvastatin initiation, participants with rosuvastatin initiation had lower risk for all-cause mortality, MACEs and MALOs, but no important differences were observed for risks for developing CKD and other statin-related adverse effects. In the UKB database, initiation of rosuvastatin led to a higher risk of T2DM compared to atorvastatin initiation. The results suggest that clinical outcomes associated with starting rosuvastatin differ from the outcomes associated with starting atorvastatin, and clinicians should consider these differences when prescribing to individual patients. However, many differences were relatively small and did not meet traditional standards for statistical significance, and further research is warranted to use these findings confidently in clinical practice.

  

Media contacts: For an embargoed PDF, please contact Angela Collom at acollom@acponline.org. To speak with corresponding authors Sheng Nie, MD, please email niesheng0202@126.com or Xin Xu, MD, PhD, please email xux007@163.com

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4. VA and DoD publish revised headache treatment advice to include recently approved therapeutics

Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-24-00551

URL goes live when the embargo lifts       

The U.S. Department of Veterans Affairs (VA) and U.S. Department of Defense (DoD) have updated their clinical practice guidelines for the management of headache to include several treatments recently approved by the U.S. Food and Drug Administration (FDA). The guidelines were revised earlier than the standard 5-year cycle due to the unprecedented expansion of headache medicine and therapeutics that took place since 2020 when the last guidelines were issued. A summary of these guidelines relevant to internal medicine physicians is published in Annals of Internal Medicine.

 

Researchers reviewed evidence from systematic reviews and studies published between 2019 and 2022 on the benefits and harms of drugs and nondrug options for the prevention and treatment of all types of headaches. The group considered the strength and quality of the evidence, input about value and care from a patient focus group and benefits versus harms on critical outcomes before making consensus recommendations. Since the last guideline update in 2020, two new classes of medications and several devices have been approved for headache indications by the FDA. The revised guidelines include 52 recommendations on evaluation, pharmacotherapy, invasive interventions, and nonpharmacologic interventions for selected primary and secondary headache disorders, including 17 new recommendations.

 

For acute migraines, primary care clinicians can consider triptans, aspirin-acetaminophen-caffeine, and newer CGRP inhibitors (gepants). To prevent episodic migraines, options include angiotensin-receptor blockers, lisinopril, topiramate, valproate, eptinezumab, and atogepant. AbobotulinumtoxinA is recommended for chronic migraines, but not for episodic migraines. Gabapentin is not recommended for episodic migraine prevention. Ibuprofen (400 mg) and acetaminophen (1000 mg) are suggested for treating tension-type headaches, with amitriptyline for chronic tension headache prevention. Aerobic exercise or physical therapy can also help manage tension headaches and migraines. Clinicians should work with their patients in crafting treatment plans that account for headache type or types, comorbid conditions, values and preferences.

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Also new in this issue:

A New Horizon: The Promise of the National Institutes of Health’s Landmark Designation of Persons With Disabilities as a Population With Health Disparities

Shahin A. Saberi, BS; Angela Zhang, BA; and Dorothy W. Tolchin, MD, EdM

Ideas and Opinions

Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-24-00676

 

What animal societies can teach us about ageing




University of Leeds







Red deer may become less sociable as they grow old to reduce the risk of picking up diseases, while older house sparrows seem to have fewer social interactions as their peers die off, according to new research which shows humans are not the only animals to change our social behaviour as we age. 

A collection of 16 studies, including six from the University of Leeds, have been published today as part of a special issue of the Philosophical Transactions of the Royal Society, investigating ageing and society across the natural world.   

One study into red deer shows that as older female deer become less and less social with age, cutting down on competition and reducing their risk of parasite infection. The study used data from a long-running project tracking a wild herd on the Scottish island of Rum. 

Dr Josh Firth from the University of Leeds’ School of Biology, an editor of the Special Issue, said that while previous research has often considered the process of becoming less social with age, known as “social ageing,” as potentially negative, these studies show changing habits could in fact bring benefits. 

Dr Firth said: “These kinds of effects might be expected across societies, where individuals might avoid social interactions as they become more vulnerable to the costs of infection. 

“Animal populations are a great way of considering the fundamental rules of how ageing may shape societies.” 

Like older humans who cut down their social interactions to avoid infections like Covid-19 – “shielding” during the pandemic in 2020 and 2021 – the less sociable older does are less likely to pick up certain parasite infections. 

“Wild animals provide a good model system for considering the costs and benefits of changing social behaviour with age, and in this case may provide an example of ageing individuals reducing their social connections to avoid disease,” Dr Firth added. 

The special edition is an international collaboration and looks at how individuals of different species age, how this shapes their social interactions, and what this means for their societies. 

Dr Greg Albery from Trinity College Dublin, a co-editor on the Special Issue, said: "Because ageing is a universal process, and all animals live in some sort of social context, the topics that we discuss in detail can have really far-ranging implications. The hope is that in understanding the diversity of ageing and sociality across lots of different species, we can shine a light on the processes governing our own society in a time when understanding ageing is particularly important.” 

Even the common garden bird the house sparrow changes its social behaviour as it ages, according to another paper in the collection. Co-author of this research, Dr Jamie Dunning said: 

“Our study is one of the first to suggest that birds, like mammals, also reduce the size of their social network as they age. Specifically, the number of friendships, and how central a bird is to the wider social network, declined with age.” 

The results may be driven by existing friends of same cohort groups dying as they age, and because it takes more effort for older birds to make friendships with fewer same-age individuals available to bond with. Conversely, the benefits of social connections may be lower than they are for younger individuals, who may come to rely on those connections for things like reproduction or information later in life, Dr Dunning added.  

The house sparrow study was led by Dr Julia Schroeder at Imperial College London, the academic lead of the long-term house sparrow study on the English island of Lundy. With no sparrows either arriving in the remote island population or leaving it, researchers can monitor the whole population from birth to death and everything in between in exceptional detail. In future, Dr Schroeder said they are interested in investigating how and when individual friendships are formed. 

The research collection shows that the social effects of ageing are a very general biological phenomenon, extending even to fruit flies. 

The new Special Issue also considers the social lives of insects. Research leader Professor Amanda Bretman3 said: “In humans, a poor social environment can have the same level of impact as smoking or obesity on healthy ageing. We also know that the same is true for other animals, but most of the work is focussed on animals we think have complex societies like chimps or bees. We systematically reviewed evidence that even in insects we don’t usually think of as having complex social lives, their social environment has some big impacts on their lifespan and ageing.” 

The studies reveal interesting patterns, she added, showing that sexes can respond differently, that the social environment during development or adulthood can have different impacts, and that the age of social partners is important. 

The subjects Prof Bretman’s team worked with, Drosophila fruit flies, were easy to manipulate in the laboratory meaning they could get a much more detailed and mechanistic understanding of why social ageing happens, which could eventually lead to new interventions to support healthy ageing in humans. 

Animal systems are now widely considered as well placed for developing our fundamental understanding of ageing societies, Dr Firth added. 

Dinosaurs thrived after ice, not fire, says a new study of ancient volcanism


The Triassic-Jurassic extinction was a very sudden event, researchers assert




Columbia Climate School

End times 

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Deposits in Morocco associated with the Triassic-Jurassic mass extinction, 201.6 million years ago. Red sediments in many locations around the world contain Triassic-era fossils. The white band on top of them is where the sediments were altered by massive volcanism, as evidenced by the gray/black basalt layers topping the assemblage.

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Credit: Paul Olsen/Lamont-Doherty Earth Observatory




201.6 million years ago, one of the Earth's five great mass extinctions took place, when three-quarters of all living species suddenly disappeared. The wipeout coincided with massive volcanic eruptions that split apart Pangaea, a giant continent then comprising almost all the planet's land. Millions of cubic miles of lava erupted over some 600,000 years, separating what are now the Americas, Europe and North Africa. It marked the end of the Triassic period and the beginning of the Jurassic, the period when dinosaurs arose to take the place of Triassic creatures and dominate the planet.

The exact mechanisms of the End Triassic Extinction have long been debated, but most prominent: Carbon dioxide surfaced by the eruptions built up over many millennia, raising temperatures to unsustainable levels for many creatures, and acidifying the oceans. But a new study says the opposite: cold, not warmth was the main culprit. The study presents evidence that instead of stretching over hundreds of thousands of years, the first pulses of lava that ended the Triassic were stupendous events lasting less than a century each. In this condensed time frame, sunlight-reflecting sulfate particles were spewed into the atmosphere, cooling the planet and freezing many of its inhabitants. Gradually rising temperatures in an environment that was hot to begin with—atmospheric carbon dioxide in the late Triassic was already three times today's level—may have finished the job later on, but it was volcanic winters that did the most damage, say the researchers.

"Carbon dioxide and sulfates act not just in opposite ways, but opposite time frames," said lead author Dennis Kent of the Columbia Climate School's Lamont-Doherty Earth Observatory. "It takes a long time for carbon dioxide to build up and heat things, but the effect of sulfates is pretty much instant. It brings us into the realm of what humans can grasp. These events happened in the span of a lifetime."

The study was just published in the journal Proceedings of the National Academy of Sciences.

The Triassic-Jurassic extinction has long been thought tied to the eruption of the so-called Central Atlantic Magmatic Province, or CAMP. In a groundbreaking 2013 study, Kent and colleagues provided perhaps the most definitive link. Kent, who studies paleomagnetism, identified a consistent polarity reversal in sediments just below the initial CAMP eruptions, which showed they all happened at the same time across what are now widespread parts of the world. Colleagues then used radioactive isotopes to date the start of volcanism to 201,564,000 years ago, give or take a few tens of thousands of years. Scientists were unable to say how big the initial eruptions were, but it was assumed by many that the massive CAMP deposits must have taken many millennia to build up.

In the new study, Kent and colleagues correlated data from CAMP deposits in the mountains of Morocco, along Nova Scotia's Bay of Fundy, and New Jersey's Newark Basin. Their key evidence: the alignments of magnetic particles in the rocks that recorded the past drifting of Earth's magnetic pole at the time of the eruptions. Due to a complex set of processes, this pole is offset from the planet's unchanging axis of rotation—true north—and to boot, changes position by a few tenths of a degree each year. (The reason that compasses do not point exactly north.) Because of this phenomenon, magnetic particles in lavas that were emplaced within a few decades of each other will all point in the same direction, while ones emplaced, say, thousands of years later will point 20 or 30 degrees in a different direction.

What the researchers found was five successive initial CAMP lava pulses spread over about 40,000 years—each with the magnetic particles aligned in a single direction, indicating the lava pulse had emerged in less than 100 years, before drift of the magnetic pole could manifest itself. They say that these huge eruptions released so many sulfates so quickly that the sun was largely blocked out, causing temperatures to plunge. Unlike carbon dioxide, which hangs around for centuries, volcanic sulfate aerosols tend to rain out of the atmosphere within years, so resulting cold spells don't last very long. But due to the rapidity and size of the eruptions, these volcanic winters were devastating. The researchers compared the CAMP series to sulfates from the 1783 eruption of Iceland's Laki volcano, which caused widespread crop failures; just the initial CAMP pulses were hundreds of times greater, they say.

In sediments just below the CAMP layers lie Triassic-era fossils: large terrestrial and semiaquatic relatives of crocodiles, strange tree lizards, giant, flat-headed amphibians, and many tropical plants. Then they disappear with the CAMP eruptions. Small feathered dinosaurs had been around for tens of millions of years before this, and survived, eventually to thrive and get much larger, along with turtles, true lizards, and mammals, possibly because they were small and could survive in burrows.

"The magnitude of the environmental effects are related to how concentrated the events are," said study coauthor Paul Olsen, a paleontologist at Lamont-Doherty. "Small events spread out over [tens of thousands of years] produce much less of an effect than the same total volume of volcanism concentrated in less than a century. The overarching implication being that the CAMP lavas represent extraordinarily concentrated events."

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The study was coauthored by Huapei Wang of China University of Geosciences, Morgan Schaller of Rensselaer Polytechnic Institute and Mohammed Et-Touhami of Morocco's Université Mohamed Premier.