In the end, it's the individual advantage that counts

The three phases of exceptional dynamics: (1) Predation on the unprotected bacteria by predators, (2) toxin formation as cooperative defense and recovery of the bacterial population, (3) filament formation as individual defense through evolution and stabilization of densities.
Photo Credit: David Kneis/TU Dresden

Bacteria rely on cooperation and evolution in order to defend themselves against predatory protists

Eating and being eaten is a normal process in nature. These predator-prey dynamics help to stabilize ecosystems. It ensures that individual species do not become too abundant, controls their populations, and prevents damage caused by overpopulation (e.g., browsing by deer in the forest or damage to crops by caterpillars). But how is it that the predators do not simply eat away all the prey, thus breaking down the system? A research team from the Helmholtz Centre for Environmental Research (UFZ) together with scientists from the Technical University (TU) of Dresden and the University of Potsdam has investigated this using bacteria and protists that live in bodies of water and discovered something astonishing. According to an article recently published in ISME Journal, bacteria defend themselves against predatory protists with cooperative behavior and evolution.

In a lake or river, between one and 10 million bacteria live in just 1 ml of water. Such a high density is necessary because bacteria permanently break down organic compounds and pollutants and thus purify the water. However, if there are too many bacteria, this can lead to the spread of pathogens. Preventing this requires predators: microscopic protists of which there are usually between a few hundred and a few thousand individuals in 1 ml of water. They constantly eat bacteria and thus ensure that the bacteria fulfil their cleaning function but do not become too abundant. Using the bacterium Pseudomonas putida and the bacterivorous protist Poteriospumella lacustris, the research team investigated the role of the various defense strategies of the bacteria and how the formation of feeding resistance is related to the dynamics of ecological systems.

Breathing is going to get tougher

Dust rising at Noordoewer, Namibia. Research shows dust will be a major contributor to poor air quality as the climate changes.
Photo Credit: Matthieu Joannon

Not all pollution comes from people. When global temperatures increase by 4 degrees Celsius, harmful plant emissions and dust will also increase by as much as 14 percent, according to new UC Riverside research.

The research does not account for a simultaneous increase in human-made sources of air pollution, which has already been predicted by other studies. 

“We are not looking at human emissions of air pollution, because we can change what we emit,” said James Gomez, UCR doctoral student and lead author of the study. “We can switch to electric cars. But that may not change air pollution from plants or dust.”

Details of the degradation in future air quality from these natural sources have now been published in the journal Communications Earth & Environment. About two-thirds of the future pollution is predicted to come from plants.

All plants produce chemicals called biogenic volatile organic compounds, or BVOCs. “The smell of a just-mowed lawn, or the sweetness of a ripe strawberry, those are BVOCs. Plants are constantly emitting them,” Gomez said.

First patient receives milestone stem cell-based transplant for Parkinson’s Disease

On 13th of February, a transplant of stem cell-derived nerve cells was administered to a person with Parkinson’s at Skåne University Hospital, Sweden. The product has been developed by Lund University and it is now being tested in patients for the first time. The transplantation product is generated from embryonic stem cells and functions to replace the dopamine nerve cells which are lost in the parkinsonian brain. This patient was the first of eight with Parkinson’s disease who will receive the transplant.

“This is an important milestone on the road towards a cell therapy that can be used to treat patients with Parkinson’s disease. The transplantation has been completed as planned, and the correct location of the cell implant has been confirmed by magnetic resonance imaging. Any potential effects of the STEM PD-product may take several years. The patient has been discharged from the hospital and evaluations will be conducted according to the study protocol,” says Gesine Paul-Visse, principal investigator for the STEM-PD clinical trial, consultant neurologist at Skåne University Hospital and adjunct professor at Lund University in Sweden.

There are around eight million people living with Parkinson’s disease globally; a disease which involves loss of dopamine nerve cells deep in the brain, leading to problems in controlling movement. The standard treatment for Parkinson’s disease is medications that replace the lost dopamine, but over time these medications often become less effective and cause side effects. As of today, there are no treatments that can repair the damaged structures within the brain or that can replace the nerve cells that are lost.

Novel Peanut Allergy Treatment Shown to be Safe, Effective, and Lasting

Edwin Kim, MD, MS
A four-year clinical trial led by Edwin Kim, MD, at the UNC School of Medicine, has found that an increased dosage of a unique type of peanut allergy immunotherapy continues to show promise for children.
Photo Credit: Courtesy of UNC School of Medicine

A four-year phase 2 clinical trial demonstrated that a peanut allergy treatment called sublingual immunotherapy, or SLIT, is effective and safe, while offering durable desensitization to peanuts in peanut-allergic children.

SLIT is a treatment using a tiny amount of peanut protein that is the equivalent of only 1/75th of a peanut kernel. It is taken under the tongue, where it is absorbed into the body, as opposed to Palforzia® peanut oral immunotherapy, which requires patients to eat a medical grade peanut flour each day.

Published in the Journal of Allergy and Clinical Immunology, the research led by corresponding author Edwin Kim, MD, associate professor of pediatrics at the UNC School of Medicine, shows that a 4 mg dose of peanut SLIT provides strong desensitization that would be expected to protect against accidental exposures to peanut in the majority of children. And most importantly, the clinical study suggests the treatment is safe.

Researchers find sea urchin die-offs threaten Caribbean coral reefs

The urchin species Diadema antillarum has long been considered the most important grazer in the Caribbean, feeding on algae that would otherwise overrun the reef and make it difficult for coral to thrive.
Photo Credit: Rachel Best

The sustained loss of a once abundant species of sea urchin in the Caribbean could also result in the functional extinction of diverse coral species from the region’s reefs, according to new research from a Florida State University team.

The urchin species Diadema antillarum has long been considered the most important grazer in the Caribbean, feeding on algae that would otherwise overrun the reef and make it difficult for coral to thrive. But two mortality events over the past 40 years have caused much of that urchin population to die off.

New research led by FSU Professor of Biological Science Don Levitan shows that the loss of these algae-free areas due to the sea urchin die-off is threatening the existence of the corals that populate Caribbean reefs.

Levitan, along with collaborator Peter Edmunds, a professor at California State University Northridge, has been collecting data on D. antillarum since his first research trip to St. John, U.S. Virgin Islands, in 1983, recording population density of the species and tracking it through mass mortality events in 1983-1984 and in 2022.

3D bioprinting inside the human body could be possible thanks to new soft robot

The tiny flexible 3D bioprinter developed at UNSW Sydney was able to 3D print a variety of materials with different shapes on the surface of a pig’s kidney.
Photo Credit: Dr Thanh Do

UNSW researchers unveil prototype device that can directly 3D print living cells onto internal organs and potentially be used as an all-in-one endoscopic surgical tool.

Engineers from UNSW Sydney have developed a miniature and flexible soft robotic arm which could be used to 3D print biomaterial directly onto organs inside a person’s body.

3D bioprinting is a process whereby biomedical parts are fabricated from so-called bioink to construct natural tissue-like structures.

Bioprinting is predominantly used for research purposes such as tissue engineering and in the development of new drugs – and normally requires the use of large 3D printing machines to produce cellular structures outside the living body.

The new research from UNSW Medical Robotics Lab, led by Dr Thanh Nho Do and his PhD student, Mai Thanh Thai, in collaboration with other researchers from UNSW including Scientia Professor Nigel Lovell, Dr Hoang-Phuong Phan, and Associate Professor Jelena Rnjak-Kovacina is detailed in a paper published in Advanced Science.

Chaos on the Nanometer Scale

Nanochaos on an asymmetric Rhodium nanocrystal
Illustration Credit: Vienna University of Technology

Sometimes, chemical reactions do not solely run stationary in one direction, but they show spatio-temporal oscillations. At TU Wien, a transition to chaotic behavior on the nanometer scale has now been observed.

Chaotic behavior is typically known from large systems: for example, from weather, from asteroids in space that are simultaneously attracted by several large celestial bodies, or from swinging pendulums that are coupled together. On the atomic scale, however, one does normally not encounter chaos – other effects predominate. Now, for the first time, scientists at TU Wien have been able to detect clear indications of chaos on the nanometer scale – in chemical reactions on tiny rhodium crystals. The results have been published in the journal Nature Communications.

Climate Trends in the West, Today and 11,000 Years Ago

UC Davis students hike in the Grand Canyon, a landscape that has changed dramatically over the past thousands and millions of years.
Photo Credit: Joe Proudman/UC Davis

People often say things like Phoenix has always been dry; Seattle has always been wet; and San Francisco has always been foggy. But “always” is a strong word. 

A study from the University of California, Davis, synthesizes climate trends across the Western U.S. during a relatively young period of Earth’s history — the Holocene Era, which stretches from the present day to the past 11,000 years. This look at the really Old West shows that the hallmarks of California’s climate — the foggy coastlines that gave rise to towering redwoods, the ocean upwelling that spawned productive fisheries, the warm summers and mild winters — began around 4,000 years ago. 

It also reveals a time when the Pacific Northwest was warm and dry and the Southwest was warm and wet.

Mysteries of the Earth: FSU researchers predict how fast ancient magma ocean solidified

An illustration of Earth as it existed during part of its formation billions of years ago, when an ocean of magma covered the surface of the planet and stretched thousands of miles deep into the core. A typical cell from a simulation conducted by FSU researchers with the relative positions of atoms are shown in the left
Illustration Credit: Courtesy of Suraj Bajgain / Lake Superior State University

Early in the formation of Earth, an ocean of magma covered the planet’s surface and stretched thousands of miles deep into its core. The rate at which that “magma ocean” cooled affected the formation of the distinct layering within the Earth and the chemical makeup of those layers.

Previous research estimated that it took hundreds of million years for that magma ocean to solidify, but new research from Florida State University published in Nature Communications narrows these large uncertainties down to less than just a couple of million years.

“This magma ocean has been an important part of Earth’s history, and this study helps us answer some fundamental questions about the planet,” said Mainak Mookherjee, an associate professor of geology in the Department of Earth, Ocean and Atmospheric Science.

When magma cools, it forms crystals. Where those crystals end up depends on how viscous the magma is and the relative density of the crystals. Crystals that are denser are likely to sink and thus change the composition of the remaining magma. The rate at which magma solidifies depends on how viscous it is. Less viscous magma will lead to faster cooling, whereas a magma ocean with thicker consistency will take a longer time to cool.

London falcons ate fewer pigeons during lockdowns

Peregrine falcon
Photo Credit: Jasmin777

The study by King’s researchers suggests that predatory birds in urban spaces are vulnerable to changes in human activities that support prey populations.

Changes in peregrine falcon diets during COVID-19 lockdowns highlight the impact of human behavior on urban predators. The findings are from a new study co-authored by King’s researchers published in the British Ecological Society journal, People and Nature.

Researchers from King’s College London and University of Bristol found that during lockdowns, peregrine falcons in London were forced to change their diet away from pigeons since fewer of these birds were being drawn in by human food supplies such as discarded food waste or direct feeding.

Brandon Mak, a PhD student in the Department of Geography who co-led the study with Ed Drewitt from the University of Bristol, said: “Our results indicate that peregrines in larger, highly urbanized cities like London may be more dependent on, and hence more vulnerable to changes in, human activities which support their prey populations, particularly feral pigeons.”