Monday, October 17, 2022

DECRIMINALIZE DRUGS
Alberta psychedelic regulations could limit patient access, critics say

Author of the article: Anna Junker
Edmonton Journal
Publishing date:Oct 15, 2022 •

Psylocibin mushrooms. Health Canada has said requests for psychedelics will be considered on a case-by-case basis for a 'serious or life-threatening condition' and where other conventional treatments have failed. 

Psychedelic therapy professionals warn new regulations set to roll out next year in Alberta could limit access and add hurdles for patients

Nick Kadysh, board chairman of Psychedelics Canada, a trade association for the legal, medicinal and for-profit segment of the psychedelics industry, said while it’s a good sign the province is making regulatory decisions, they lean heavily on the use of psychiatrists.

“Any clinic has to have a psychiatrist responsible,” he said in a recent interview with Postmedia. “Any patient has to talk to a psychiatrist before getting access to these therapies and we just know that there is an incredibly long wait time for psychiatry services in Alberta. So it becomes a patient access issue.”

The Alberta government announced the new rules on Oct. 5 for psychedelics such as psilocybin, psilocin, MDMA, LSD, mescaline (peyote), DMT, 5 methoxy DMT, and ketamine. The province says they are meant to provide safeguards and medical oversight, coming into effect next January.

While some clinical trials have shown promising results for the use of psychedelics as a treatment for mental health conditions, the drugs are illegal in Canada. However, health practitioners and researchers can apply for permission from Health Canada to use psychedelics in research or for therapeutic use in special circumstances. The same rules still apply in Alberta under the new regulations.

The provincial rules differ based on the level of risk involved. With few exceptions, clinics offering psychedelic-assisted treatment must be licensed and have the medical oversight of a psychiatrist.

With only psychiatrists providing oversight and not other professionals like anesthesiologists, neurologists, and general practitioners, access could be limited, said Liam Bedard, coordinator of Psychedelics Canada.

“There are a number of qualified practitioners that can oversee these therapies and by mandating that only psychiatrists can manage them, it’s creating bottlenecks in accessing these potentially very valuable therapeutic tools,” he said.

In a statement, Alberta mental health and addictions spokesman Eric Engler said the regulation does not limit the prescription of psychedelic drugs to only psychiatrists. Others can prescribe them, after and with ongoing consultation with a psychiatrist.

“A psychiatrist is required to oversee services for psychedelic-assisted psychotherapy, as they are the most highly trained and experienced regulated health professionals in the diagnosis and treatment of psychiatric disorders,” Engler said.

“Alberta is setting a deliberately high bar to protect patients, since the evidence for use of these drugs in the treatment of psychiatric disorder is still emerging and not without risk.”

At SABI Mind, intramuscular injections of ketamine are used to treat people for mental health conditions like trauma, depression, or chronic pain conditions, said Philippe Lucas, president and CEO of the psychedelic-assisted psychotherapy clinic group that has a location opening in Edmonton in November.

The new regulations do not apply to all uses of ketamine, since it is approved for use outside of psychedelic-assisted therapy, such as an anesthetic for pain management.

SABI Mind also has an in-house psychiatrist and therefore won’t be severely affected by the new regulations. However, Lucas said it can currently take between six and 18 months for a patient with a referral to see a psychiatrist in Alberta, a problem paired with the fact that only a handful in the province would be comfortable considering psychedelics as a treatment option.

“When we’re talking about hundreds, if not thousands, of patients needing to now line up to see one of those 10 or 12 psychiatrists that are willing to prescribe or consider psychedelic-assisted psychotherapy, you can see how this will inevitably create bottlenecks,” Lucas said.

Leah Mayo, the Parker Psychedelic Research Chair at the University of Calgary, said the regulations are like “putting the cart before the horse” since the field is still evolving with research still being done on who can be treated, the frequency of treatment, and dosing.

“While it’s good to kind of advance the field and increase access to these compounds, I still think we’re so early on that I mean, we don’t even know what populations should be getting these medications,” she said.

Dr. Robert Tanguay, a psychiatrist specializing in addiction medicine and vice-president of the Newly Institute, a network of medically-assisted psychotherapy clinics, attended the province’s announcement of the new rules on Oct. 5. He said they protect individuals from unregulated individuals providing non-evidenced-based treatment.

“I think at the end of the day, it moves us forward and increasing the amount of access and putting structure behind what we’re supposed to be doing, and most importantly, protecting those individuals who are under the influence while in treatment,” Tanguay said.

In a statement at the time of the announcement, the College of Physicians and Surgeons of Alberta supported innovative approaches to health care and noted protecting the public while guiding regulated members remains a focus to ensure safe, high-quality innovation.

Despite criticisms, the Alberta government is credited for trying to get ahead of the curve.

“I think that they are trying to get ahead of the eight-ball and trying to design regulations for these therapies as they progress, which is great. That’s actually very, very forward-thinking,” Kadysh said.

RECOMMENDED FROM EDITORIAL

Alberta to offer high potency opioids in clinics


Edmonton professor aims to treat mental illness with psychadelics through new company



New Alberta opioid program could increase barriers and harm, health professionals say

“We definitely need to watch the risks of diversion, it's very important to reduce diversion. But there's also a duty to ensure that our clients don't have any harm come their way and get destabilized.”

Author of the article: Anna Junker
Edmonton Journal
Publishing date: Oct 16, 2022 
Mike Ellis, associate minister of mental health and addictions, left, listens to Dr. Robert Tanguay, co-chair, Alberta Pain Strategy and co-lead, Rapid Access Addiction Medicine Program, Alberta Health Services. The two were speaking at a news conference to announce new rules for the use of high-potency opioids on Oct. 5, 2022.
 PHOTO BY GREG SOUTHAM /Postmedia, file

Health-care professionals say new provincial regulations for high-potency opioids may increase barriers and harm to patients seeking treatment.

On Oct. 5, the Alberta government announced the narcotics transition services program where opioids such as hydromorphone, diacetylmorphine (heroin) and fentanyl are offered at licensed opioid dependency program (ODP) clinics run by Alberta Health Services.


The changes mean community health professionals can no longer prescribe and pharmacists will no longer be able to dispense high-potency opioids for treatment. Patients must instead be referred to the ODP clinics by a health-care professional or self-refer.

While the goal is to transition the patient to opioid agonist therapy medication, like suboxone, and provide access to other wraparound supports, a patient cannot be discharged from the program if they are unable to make the transition

The province estimates fewer than 350 people in Alberta are currently prescribed high-potency opioids for severe addiction and will be affected by the changes.

Elaine Hyshka, associate professor at the University of Alberta’s School of Public Health, said that means 350 people who are getting treatment and likely doing well will now be abruptly forced to alter their lives.

“You have to change to a new clinic, where you’re going to have to go likely multiple times per day to get your dose and structure your whole life around that new routine,” she said. “And best of luck to you that you continue to be stable and in your recovery. That to me is really fundamentally unfair to those patients.”

Dr. Monty Ghosh, an internist and addiction specialist at the U of A, echoed concerns that clients will have to travel to a brick-and-mortar facility, as opposed to a pharmacy or have a take-home option.

“That would pose a barrier for numerous individuals if they have cognitive concerns, behavioural concerns, developmental delay,” he said. “Having to come three times a day might be problematic for individuals.”

The new program is only for the most severe cases of opioid addiction and is an extremely specialized service, said Eric Engler, spokesman for the mental health and addictions ministry, in a statement.

“The medications that may be provided as part of this program can be extremely dangerous, especially if they are diverted into the community,” Engler said. “This service will only be provided to those with the most severe cases of opioid addiction, in a supervised setting, with no opportunity for diversion of dangerous opioids to the community. The risk of these drugs being diverted is simply too high to offer this service in any other way.

But Hyshka said it’s “very problematic” that the province is “cracking down” on prescribing high-potency opioids when there isn’t a lot of evidence it is causing problems.

Out of the 884 drug poisoning deaths recorded between January and July this year, 20 were from pharmaceutical opioids.

Diversion is still a real concern, Ghosh said. But the crux of the issue is the risks of diversion need to be weighed with the risk of harms associated with destabilization that the new rules may cause.

“We definitely need to watch the risks of diversion, it’s very important to reduce diversion. But there’s also a duty to ensure that our clients don’t have any harm come their way and get destabilized.”

Individuals who treat chronic pain with pharmaceutical opioids are an example of providing take-home high-potency drugs without concerns of diversion, Ghosh said. (Chronic pain patients are not affected by the new regulations.)

“There are some substance users who are more or less the same as well,” he said. “So where does this land for them? And does this create a system of more stigma for these individuals?”

Dr. Ginetta Salvalaggio, an associate professor with the U of A’s department of family medicine, said continuity and relationships help people stay on their medications long term.

“What we’re doing here is a very top-down approach, sending people to people they don’t know,” she said. “This is not the sort of program that would be designed by people who use drugs.”

Engler said clients are encouraged to maintain relations with their existing care team, and the new standards require AHS to take steps to maintain those connections, too.

There are some positives to the program. Hyshka said clinics providing diacetylmorphine is an addition that has not been offered before in Alberta.

For Ghosh, one of the positives is increased access to high-potency opioids, not just in Edmonton and Calgary, but across the provincial health zones.

“In addition to this, there’s a strong emphasis on providing wraparound services for clients,” he said. “So making sure they get access to other wellness supports to support their housing, their income support, their mental health issues. These are all being provided as part of the service, which is fantastic news.”

The framework also includes a process to protect individuals who can’t transition off the high-potency opioids to more stabilized versions like suboxone.

“That’s really helpful and it really moves us in the right direction and it provides an outlet in some respects for safe supply,” Ghosh said.

RECOMMENDED FROM EDITORIAL
Alberta provincial police question deserves a referendum, rural municipalities say

Anna Junker - Yesterday 

Alberta Premier Danielle Smith.© Provided by Edmonton Journal

The head of a group representing Alberta’s rural municipalities says Premier Danielle Smith should hold a referendum if she wants to go forward with the establishment of a provincial police service .

During her first media availability as premier, Smith said rural policing is a top priority for her government and would like to see provincial police “augment” the RCMP. She said provincial police would be trained to address new policing priorities, like rural property crime fuelled by drug use.

“More than 50 per cent of the calls I’m hearing are mental health and addiction calls and so that will require a different type of training and a different type of officer quite frankly,” Smith said. “We can have the ability to chart a new path by establishing the provincial police.”

But Paul McLauchlin, president of the Rural Municipalities of Alberta, believes the province should hold a referendum on the issue during the provincial election next spring.

He said the province should engage the public and let their voices be heard. This will provide clarity on whether money and energy should be spent pursuing provincial police instead of addressing issues with the RCMP.

“If you’re confident that this is a great idea, Albertans are smart people, respect them and let them make the decision and move forward on that,” McLauchlin said.

McLauchlin said there are concerns with mental health and addictions-related calls in rural areas, but a way to address that is through early intervention and better access to wraparound services.

“We do have a revolving door in our judicial system, we really need to find a way to help these people,” he said.

“Literally, they get caught and released in the same day, and it’s frustrating for our RCMP. So definitely, those pieces are so important that I think any investment this province wants to make (in) mental health, poverty reduction, early intervention, and then us addressing the judicial system, that will solve crime two years from now and 10 years from now.”

Becca Polak, Smith’s press secretary, did not answer specific questions on what a provincial police service could look like and whether the province would hold a referendum. In a statement, she said Smith is committed to ensuring Albertans feel safe, secure and protected in their communities.

“We must have a police service that is well-managed, properly resourced, and is focused on the safety, mental health, and well being of our citizens,” Polak said.

“While our frontline workers are valued by the citizens they serve, the model where policing priorities are made in Ottawa does not always work for Alberta’s communities and we are committed to ensuring policing priorities are set by Albertans. We continue to meet with Albertans, rural municipalities, and other stakeholders to ensure we have a policing model that addresses their concerns.”

In August, Justice Minister and Solicitor General Tyler Shandro released details about a possible model. It is estimated a transition from the RCMP would cost an initial $366 million and an extra $200 million annually.

The model outlines the creation of up to 85 community detachments and 30 “service hubs” that would have between 48 and 192 officers. The hubs would serve as detachments and homes for specialized teams.

Three urban detachments would serve larger communities and function as regional headquarters.

Mount Royal University criminologist Kelly Sundberg said a provincial police service makes sense as long as it is not a copy of the RCMP.

“We need to rethink policing altogether, how police are selected, educated, trained, equipped, governed, held accountable. All of this has to change,” he said.

“There’s enough public concern to warrant the exploring of a new model, as the government has already indicated they want a new provincial police, why not make it a modern example of policing excellence, as opposed to just using the same model we’ve been doing forever.”


– with files from Kellen Taniguchi
ajunker@postmedia.com
Twitter.com/JunkerAnna

Robots monitor the environmental impact of the gas leak

Business Announcement

UNIVERSITY OF GOTHENBURG

Glider 

IMAGE: THE UNDERWATER ROBOTS, CALLED GLIDERS, REGISTER DATA FROM THE SEA BOTTOM TO THE SURFACE NON STOP. view more 

CREDIT: VOTO/ALEKSANDRA MAZUR

The University of Gothenburg has deployed three underwater robots in the Baltic waters around the leaks on the Nord Stream gas pipelines. This is done to be able to follow how chemistry and life in the sea changes over time due to the large release of methane gas. In addition, research vessel Skagerak is set to deploy on a new expedition to the Baltic Sea to test run the large, unmanned vessel Ran.

The expedition with R/V Skagerak was not the only measure the university's researchers took when the Nord Stream pipelines began to leak methane gas. With the help of the Voice of the Ocean foundation, VOTO, three remote-controlled underwater robots were placed in the area. They will move around the sea and record water data continuously for the next 15 weeks.
“They are called gliders and are provided by VOTO, who also manages their operation. The robots can give us measurements over a series of time about how the chemistry and quality of the water is affected by the natural gas leak”, says oceanographer Bastien Queste at the University of Gothenburg.

Plenty of data from the area

Since March 2021, VOTO has had two gliders in the area which functions as one of the foundation's ocean observatories and where the water quality is measured non-stop. The robots go down to the bottom and then turn up to the surface, something that is repeated over a preset distance. Every time the glider is at the surface, the latest measurement data is sent to the researchers via satellite. Thus, plenty of data from this area already exists from before. One of the three additional robots that was dropped into the sea last week has been equipped by the manufacturer Alseamar with a special sensor to be able to measure the change in the methane content over the next 15 weeks.

 “Last week's expedition provided valuable data and a snapshot of the state of the ocean immediately after the leakage occurred. With the new robots in place, we receive continuous reports on the state of the water near the Nord stream pipeline leaks. They are deployed solely for this purpose”, says Bastien Queste.

“The point is that we get measurements from the water over a long period of time and over a larger area. We can see how long it takes for the methane to disappear and how the aquatic environment reacts over time. The response in the sea is often delayed. It may take days or weeks before we see a change”, says Bastien Queste.

Even the underwater robots that are usually deployed there, can contribute important data as they measure salinity, temperature, oxygen content and the amount of chlorophyll. This completes the picture of how the water in the Baltic Sea is doing after the gas leak.

Solid scientific documentation

 “Together with the new robots and the expedition's measurements, we researchers will have solid scientific documentation of the impact of the Nord Stream leak. When we add it all up, we have a good picture of both the immediate and the delayed effects. With gliders that continuously measure, we will be able to better understand the processes that were observed then”, says Bastien Queste.

The expedition has barely had time to disembark before preparations for the next trip to the Baltic Sea with Skagerak have started. Polar researcher Anna Wåhlin had, for a long time, planned a trip with the ship precisely to the area east of Bornholm.

“I will test how the large underwater robot Ran behaves in seas with large layers of density and how well it can measure over sediment-rich bottoms. This place is perfect for that. Ran will also be able to contribute to research into gas emissions because it measures the carbon dioxide and nitrate levels in the water”, says Anna Wåhlin.
This is also the first time that Ran departs from Skagerak, which will be an important test of the ship's flexibility.


CAPTION

The underwater robot will work in the area for 15 weeks.

CREDIT

Anna Wåhlin

Ancient invasion can inform modern strategies for wildlife conservation

Animals 446 million years ago also had to contend with invasive species

Reports and Proceedings

UNIVERSITY OF CINCINNATI

Forsythe 

IMAGE: UNIVERSITY OF CINCINNATI GEOLOGY STUDENT IAN FORSYTHE STUDIED THE FOSSIL RECORD IN THE LATE ORDOVICIAN PERIOD TO LEARN MORE ABOUT A PHENOMENON CALLED THE RICHMONDIAN INVASION. view more 

CREDIT: IAN FORSYTHE

We might be inclined to think of invasive species as a modern problem of our own creation or carelessness.

But a University of Cincinnati graduate student says ecosystems around the world have had to contend with new invaders for hundreds of millions of years.

Ian Forsythe studies geology in UC’s College of Arts and Sciences. In his latest work in UC’s Department of Geosciences, he examined the fossil record to examine how one well-known invasion of animals that impacted surrounding animals in the vast shallow seas that covered the Midwestern United States during the Late Ordovician Period.

“We are a catalyst for these things today. But these biotic invasions happened in the past, too,” Forsythe said.

Forsythe presented his findings in October to the annual conference of the Geological Society of America.

Just how he can study changes in species over time is a testament to the amazing fossil record left behind from the Ordovician. Ohio, Indiana and Kentucky were covered in a salty sea filled with starfish, crinoids, brachiopods and other mollusks.

Today, it’s hard to find a rock in any southwestern Ohio creek that doesn’t bear evidence of these ancient marine fossils. Paleontologists from around the world come to Cincinnati to study its fossils.

“We have really incredible fossil deposits here. They’re globally exceptional,” Forsythe said. “The quantity of fossils gives us an awesome window to the past. It’s an amazing natural laboratory.”

Forsythe said one well-known phenomenon called the Richmondian Invasion about 446 million years ago brought a myriad of new species into contact with each other in these shallow seas.

But unlike some invaders like brown tree snakes that have wiped out entire populations of birds in places like Guam, the ocean invaders did not cause widespread extinctions, Forsythe said.

Instead, the native species were generalists that didn’t need specialized habitats or food requirements and were able to adapt and make room for the newcomers, he said.

“Generalists are more successful during invasions because they can contract their niche to accommodate novel competitors,” he said.

Since the invaders were low on the food chain, they didn’t cause a widespread disruption, he said.

Forsythe began the project at Ohio University in the lab of Alycia Stigall, now a professor at the University of Tennessee in Knoxville.

“The Richmondian invasion is one of the most intensively studied fossil invasion events in terms of ecosystem and species impacts,” Stigall told the Geological Society of America. “But Ian’s work is truly groundbreaking; he was able to examine changes at the community level at a very fine temporal level of a few thousand years and relate this directly to changes in sea level and the timing of the invaders’ arrival.”

Still, there is a lot we can learn about the resilience of today’s ecosystems by studying these changes millions of years ago, Forsythe said.

“That’s what drew me to invasion science. It’s a big issue today with so many outstanding questions,” he said. “We can’t answer how these things play out in longer timescales without a long data set.”

Forsythe said invaders higher on the food chain present a greater existential threat to native species, particularly those with specialized dietary or habitat needs.

“It’s a guiding principle for what imperiled species might require attention first,” Forsythe said.


New walking robot design could revolutionize how we build things in space

Peer-Reviewed Publication

FRONTIERS

Researchers have designed a state-of-the-art walking robot that could revolutionize large construction projects in space. They tested the feasibility of the robot for the in-space assembly of a 25m Large Aperture Space Telescope. They present their findings in Frontiers in Robotics and AI. A scaled-down prototype of the robot also showed promise for large construction applications on Earth.

Maintenance and servicing of large constructions are nowhere more needed than in space, where the conditions are extreme and human technology has a short lifespan. Extravehicular activities (activities done by an astronaut outside a spacecraft), robotics, and autonomous systems solutions have been useful for servicing and maintenance missions and have helped the space community conduct ground-breaking research on various space missions. Advancements in robotics and autonomous systems facilitate a multitude of in-space services. This includes, but is not limited to, manufacturing, assembly, maintenance, astronomy, earth observation, and debris removal.

With the countless risks involved, only relying on human builders is not enough, and current technologies are becoming outdated. 

“We need to introduce sustainable, futuristic technology to support the current and growing orbital ecosystem,” explained corresponding author Manu Nair, PhD candidate at the University of Lincoln.

“As the scale of space missions grows, there is a need for more extensive infrastructures in orbit. Assembly missions in space would hold one of the key responsibilities in meeting the increasing demand.” 

In their paper, Nair and his colleagues introduced an innovative, dexterous walking robotic system that can be used for in orbit assembly missions. As a use case, the researchers tested the robot for the assembly of a 25m Large Aperture Space Telescope (LAST).

Assembling telescopes in orbit

Ever since the launch of the Hubble Space Telescope and its successor, the James Webb Space Telescope, the space community has been continuously moving towards deploying newer and larger telescopes with larger apertures (the diameter of the light collecting region).

Assembling such telescopes, such as a 25m LAST, on Earth is not possible with our current launch vehicles due to their limited size. That is why larger telescopes ideally need to be assembled in space (or in orbit).

“The prospect of in-orbit commissioning of a LAST has fueled scientific and commercial interests in deep-space astronomy and Earth observation,” said Nair.

To assemble a telescope of that magnitude in space, we need the right tools: “Although conventional space walking robotic candidates are dexterous, they are constrained in maneuverability. Therefore, it is significant for future in-orbit walking robot designs to incorporate mobility features to offer access to a much larger workspace without compromising the dexterity.”

E-Walker robot

The researchers proposed a seven degrees-of-freedom fully dexterous end-over-end walking robot (a limbed robotic system that can move along a surface to different locations to perform tasks with seven degrees of motion capabilities), or, in short, an E-Walker.

They conducted an in-depth design engineering exercise to test the robot for its capabilities to efficiently assemble a 25m LAST in orbit. The robot was compared to the existing Canadarm2 and the European Robotic Arm on the International Space Station. Additionally, a scaled down prototype for Earth-analog testing was developed and another design engineering exercise performed. 

“Our analysis shows that the proposed innovative E-Walker design proves to be versatile and an ideal candidate for future in-orbit missions. The E-Walker would be able to extend the life cycle of a mission by carrying out routine maintenance and servicing missions post assembly, in space” explained Nair.

“The analysis of the scaled-down prototype identifies it to also be an ideal candidate for servicing, maintenance, and assembly operations on Earth, such as carrying out regular maintenance checks on wind turbines.”

Yet a lot remains to be explored. The research was limited to the design engineering analysis of a full-scale and prototype model of the E-Walker. Nair explained: “The E-Walker prototyping work is now in progress at the University of Lincoln; therefore, the experimental verification and validation will be published separately.”

 

How scientist summarized the development of space robotic technologies for on-orbit assembly?


How to find the future research direction of space machine on-orbit assembly?

Peer-Reviewed Publication

BEIJING INSTITUTE OF TECHNOLOGY PRESS CO., LTD

Heterogeneous space robots assemble large space structures on orbit. 

IMAGE: HETEROGENEOUS SPACE ROBOTS ASSEMBLE LARGE SPACE STRUCTURES ON ORBIT. view more 

CREDIT: SPACE: SCIENCE & TECHNOLOGY

The construction of large structures is one of the main development trends of the space exploration in the future, such as large space stations, large space solar power stations, and large space telescopes. However, due to their large size, such structures cannot be carried directly into space by rockets or spacecraft. Therefore, these large structures need to be broken down into multiple modular units, which are brought into space by a launch vehicle and then assembled. This is an important task of on-orbit servicing (OOS): on-orbit assembly. It is one of important development tendency, which aims to make full use of space robots to assemble space structures autonomously in the aerospace industry. In a review paper recently published in Space: Science & Technology, Qirong Tang from Tongji University and Delun Li and other experts and engineers from China Academy of Space Technology summarized the development status of space robot technology and the relevant space robot on-orbit assembly technology in recent decades.

First of all, the author introduced the research status of on-orbit assembly of space robots. The aerospace industry had been researching and practicing on-orbit service technology for decades. It was known that the space on-orbit assembly task could be completed by space robots and astronauts in collaboration. Although manual assembly by astronauts had proven to be an effective method for constructing space structures, this method had many limitations. Therefore, it was very necessary to use space robots to autonomously complete on-orbit assembly tasks. In general, space on-orbit assembly technology has gradually developed from manual operation to autonomous work. The way of working has shifted from simple assisted astronaut operations to autonomous assembly and maintenance. Mission scenes have also changed from a single small object to a large spatial structure. However, in terms of the development of space-in-orbit assembly technology, it has not yet matured and applied. However, as far as the development of space on-orbit assembly technology was concerned, it had not yet been matured and applied. Moreover, as the size of the object becomes larger, the flexible vibration becomes stronger, and the assembly accuracy becomes higher during the assembly process, the research on multi robot cooperation to complete high-precision operation needs to be in-depth.

Afterwards, the author discusses the key technologies of space-on-orbit assembly, including assembly sequence planning, space robot motion planning, on-orbit assembly, and vibration suppression and compliance control methods. Firstly, based on the space robot motion planning and assembly sequence planning, the development of space robot planning algorithms was introduced. The planning of assembly sequences described the details of assembly operations in how different parts should be placed in a product. The traditional assembly planning method was greatly affected by human factors. At the same time, the increasing complexity of assembly structure and the diversification of assembly evaluation criteria also brought difficulties to assembly sequence planning. Computer intelligent assembly methods, such as virtual reality technology, could make up for this deficiency and improve the efficiency and reliability of assembly sequence planning. As for the motion planning, it was of great significance to the on-orbit operation of space robots. When a space robot performs on-orbit assembly in space, a basic task was to move the spacecraft from one point to another in the state space. For the spacecraft itself, its state space was the displacement and rotation of the spacecraft in the Cartesian coordinate system. Therefore, the traditional Dijkstra, A∗, and other algorithms can be used as path planning methods. Besides, commonly used intelligent bionic algorithms, including genetic algorithm, ant colony algorithm, and particle swarm algorithm were also applied. Secondly, the space robot assembly method was summarized. The artificial potential field method, machine vision method, neural network learning method and so on were developed and applied in important scenarios, i.e. assembling the large space truss and performing space multirobot multitask. At last, from the control point of view, how to solve the vibration suppression and compliant assembly of on-orbit assembly is reviewed. Due to the microgravity conditions in space, it was easy to cause vibration of large structures. Analysis of single and multiple robot assembly strategies, as well as the hybrid method of branch and bound and improved ant colony algorithm, could suppress the vibration disturbance. In the assembly contact process, there was direct contact between the targets, and a certain amount of force (moment) would be generated, so compliance control was also very necessary. The current compliance control methods are mainly divided into two categories: active compliance and passive compliance. Passive compliance was completely dependent on the properties of the material, cannot be controlled, and had high uncertainty. And active compliance referred to obtaining contact force information through sensors, using the information as a feedback input to the controller, and performing feedback control of the robotic arm to reduce the contact force and achieve the purpose of compliance control. Active force position control generally adopted traditional “force-position” hybrid control, impedance control, and other methods.

Then, in order to simulate the space assembly scene on the ground, the author introduced the development of ground verification experiments and provided ideas for the effective verification of space on-orbit assembly technology. Due to the high cost of space on-orbit construction, the space manipulator and its related control system and other environments must be verified on the ground to ensure that all equipment can operate normally before the space on-orbit assembly. The biggest difference between the ground and space was whether there was gravity, so how to simulate zero-microgravity conditions was the key and focus of ground test verification. At present, there were five commonly used ground verification methods, namely, air flotation method, water flotation method, force compensation method, parabola method, and free fall method. The space administrations or space institutes of various countries had established corresponding laboratories, especially the air flotation experimental platform and the gravity compensation experimental platform with the purpose of completing the “space-ground consistency” experiment on the ground and ensuring the accuracy and feasibility of the experiment.

Finally, the author summarized opportunities and challenges of on-orbit assembly in the future.

On-orbit assembly relies on space multirobot coordination and a super presence and the support intelligent interaction capabilities such as brain control, voice control, and eye control are worthy being developed.

More intelligent on-orbit assembly technology is boosting, including the autonomous decision-making functions, fault diagnosis and self-repair functions, autonomous mission planning, autonomous work, and learning capabilities.

Diversified capabilities of space robots are potential. The robots not only need to have long-distance transfer and movement functions, but also need to have the ability to complete high-precision operations and flexible operations including clamping, rotating, pulling, cutting, connector operation, and even own functions of robot group reconstruction, robot task reconstruction, and configuration reconstruction.

How fluctuating oxygen levels may have accelerated animal evolution

Peer-Reviewed Publication

UNIVERSITY OF LEEDS

Early animal fossil 

IMAGE: FOSSIL RECORDS OF EARLY ANIMALS FROM MISTAKEN POINT ECOLOGICAL RESERVE IN CANADA. view more 

CREDIT: DR EMILY. G. MITCHELL – UNIVERSITY OF CAMBRIDGE

How fluctuating oxygen levels may have accelerated animal evolution

Oxygen levels in the Earth’s atmosphere are likely to have “fluctuated wildly” one billion years ago, creating conditions that could have accelerated the development of early animal life, according to new research.  

 
Scientists believe atmospheric oxygen developed in three stages, starting with what is known as the Great Oxidation Event around two billion years ago, when oxygen first appeared in the atmosphere. The third stage, around 400 million years ago, saw atmospheric oxygen rise to levels that exist today.  

 
What is uncertain is what happened during the second stage, in a time known as the Neoproterozoic Era, which started about one billion years ago and lasted for around 500 million years, during which time early forms of animal life emerged.   

 
The question scientists have tried to answer is - was there anything extraordinary about the changes to oxygen levels in the Neoproterozoic Era that may have played a pivotal role in the early evolution of animals – did oxygen levels suddenly rise or was there a gradual increase?  

 
Fossilised traces of early animals - known as Ediacaran biota, multi-celled organisms that required oxygen - have been found in sedimentary rocks that are 541 to 635 million years old.  

  

To try and answer the question, a research team at the University of Leeds supported by the Universities of Lyon, Exeter and UCL, used measurements of the different forms of carbon, or carbon isotopes, found in limestone rocks taken from shallow seas. Based on the isotope ratios of the different types of carbon found, the researchers were able to calculate photosynthesis levels that existed millions of years ago and infer atmospheric oxygen levels.  

 
As a result of the calculations, they have been able to produce a record of oxygen levels in the atmosphere over the last 1.5 billion years, which tells us how much oxygen would have been diffusing into the ocean to support early marine life. 

 

Fossil records of early animals from Mistaken Point Ecological Reserve in Canada

CREDIT

Dr Emily. G. Mitchell – University of Cambridge

Dr Alex Krause, a biogeochemical modeller who completed his PhD in the School of Earth and Environment at Leeds and was the lead scientist on the project, said the findings give a new perspective on the way oxygen levels were changing on Earth.  

 
He added: “The early Earth, for the first two billion years of its existence, was anoxic, devoid of atmospheric oxygen. Then oxygen levels started to rise, which is known as the Great Oxidation Event.   

 
“Up until now, scientists had thought that after the Great Oxidation Event, oxygen levels were either low and then shot up just before we see the first animals evolve, or that oxygen levels were high for many millions of years before the animals came along. 

 
“But our study shows oxygen levels were far more dynamic. There was an oscillation between high and low levels of oxygen for a long time before early forms of animal life emerged. We are seeing periods where the ocean environment, where early animals lived, would have had abundant oxygen - and then periods where it does not.  

 

Dr Benjamin Mills, who leads the Earth Evolution Modelling Group at Leeds and supervised the project, said: “This periodic change in environmental conditions would have produced evolutionary pressures where some life forms may have become extinct and new ones could emerge.”  

 
Dr Mills said the oxygenated periods expanded what are known as “habitable spaces” – parts of the ocean where oxygen levels would have been high enough to support early animal life forms.  

 
He said: “It has been proposed in ecological theory that when you have a habitable space that is expanding and contracting, this can support rapid changes to the diversity of biological life.  

 
“When oxygen levels decline, there is severe environmental pressure on some organisms which could drive extinctions. And when the oxygen-rich waters expand, the new space allows the survivors to rise to ecological dominance.  

 

“These expanded habitable spaces would have lasted for millions of years, giving plenty of time for ecosystems to develop.”

END

Discovery of family of hormones may be key to increased crop yields


Peer-Reviewed Publication

NAGOYA UNIVERSITY

PSY 

IMAGE: PSY RECEPTOR MUTANT (RIGHT) AND WILD TYPE (LEFT). PSY RECEPTOR MUTANT IS LESS STRESS TOLERANT, BUT ITS GROWTH IS FACILITATED. view more 

CREDIT: DR. YOSHIKATSU MATSUBAYASHI

Crops often face harsh growing environments. Instead of using energy for growth, factors such as disease, extreme temperatures, and salty soils force plants to use it to respond to the resulting stress. This is known as the “growth-stress response trade-off". Now, a group of researchers from Nagoya University has discovered a previously unknown pathway that regulates whether a plant uses its resources for growth or stress tolerance. This discovery could enable the stress response to be controlled under agricultural conditions, increasing crop yields. They published the findings in the journal Science

A research group, led by Professor Yoshikatsu Matsubayashi and Assistant Professor Mari Ohnishi of the Graduate School of Science at Nagoya University in Japan, investigated the role of hormones and their receptors in the plant stress response. They focused on three receptors for which the corresponding hormone had not yet been identified. Using thale cress (Arabidopsis thaliana), a small flowering plant, they discovered the PSY family, which functions as a hormone, binding to these receptors and mediating the switch between the stress response and growth.  

When the researchers investigated the pathway involved, they made an unexpected discovery. Usually, receptors and hormones function like locks and keys, with the hormone (in this case, a peptide PSY hormone) acting as a key that is necessary to start a biological process. However, in this study, plant cells that did not produce PSY nonetheless had an active stress response. Therefore, this suggests that instead of activating the stress response, the presence of the PSY ‘key’ in the receptor ‘lock’ keeps it switched off. 

To test the nature of stress responses, the researchers grew plants under extremely stressful conditions using heat, salt, and also infected them with bacteria. Plants that were either deficient in PSY receptors or were continuously fed the hormone PSY failed to respond adequately to stress, resulting in reduced survival. The scientists concluded that stressed plants stop releasing PSY, the absence of which induces stress response genes. 

To explain this phenomenon, the researchers proposed a mechanism in which damaged cells reduce the concentration of PSY hormones in the cell layers next to the damaged sites. This lack of PSY triggers the stress response. Importantly, this may explain why even damaged plants can send messages. Rather than using their limited resources to create a new signal, an impaired plant cell may instead stop the release of the PSY hormone, activating the stress response. Such a mechanism would balance stress tolerance with associated energy costs. As a result, even under the most stressful environmental conditions, plants can still grow by managing their limited resources. 

“Most of the mechanisms found in Arabidopsis are found in other plants. Therefore, our results apply to all crops,” explained Matsubayashi. “This mechanism makes it possible to artificially control the balance between stress tolerance and yield, which is a trade-off relationship. In recent years, an increasing number of crop plants have been grown in plant factories. When crops are grown indoors, it is a low-stress environment and the stress response system that is needed to withstand the fluctuating natural outdoor environment is not always necessary. Generating cultivars with reduced PSY receptor activity in plant factories may lead to higher yields in these controlled environments.”  

//Funding// 
This research was supported by Grant-in-Aid for Scientific Research (S) (project number 18H05274), which started in FY2008, and by Grant-in-Aid for Scientific Transformation (A) (project number 20H05907), which started in FY 2020.