How bacteria adhere to cells: Basis for the development of a new class of antibiotics

Adhesion of Bartonella henselae (blue) to human blood vessel cells (red). The bacterium's adhesion to the host cells could be blocked with the help of what are known as “anti-ligands".
Credit: Goethe University

Researchers from University Hospital Frankfurt and Goethe University Frankfurt have unraveled how bacteria adhere to host cells and thus taken the first step towards developing a new class of antibiotics.

The adhesion of bacteria to host cells is always the first and one of the decisive steps in the development of infectious diseases. The purpose of this adhesion by infectious pathogens is first to colonize the host organism (i.e., the human body), and then to trigger an infection, which in the worst case can end fatally. Precise understanding of the bacteria's adhesion to host cells is a key to finding therapeutic alternatives that block this critical interaction in the earliest possible stage of an infection.

The hawk has landed: braking mid-air to prioritize safety over energy or speed

A Harris hawk braking in mid-air before perching.
Resized image using AI by SFLORG
Credit: Rob Bullingham

New research from the Oxford Flight Group using computer simulations and Hollywood-style motion capture shows how birds optimize their landing maneuvers for an accurate descent.

Researchers at the University of Oxford have found that hawks control their flight to ensure the safest landing conditions when perching, even if it takes longer and more energy to do so. Understanding how birds optimize their landing maneuvers through learning may help in developing small aircraft capable of perching like birds.

In new research published in Nature, four Harris’ hawks wearing tiny retroreflective markers were tracked flying back and forth between two perches. Their precise movements were recorded by 20 motion capture cameras positioned around the room, allowing the research team to reconstruct their flight paths on over 1,500 flights. The research team then used computer simulations to understand why the birds chose their particular path to the perch.

Aircraft have the luxury of using a runway for braking after landing to reduce speed. In contrast, birds must brake before they arrive at the perch – however slowing down to a safe speed while in flight risks stall, leading to a sudden loss of flight control. The researchers discovered that the hawks follow a flight path that slows them down to a safe speed but minimizes the distance from the perch at which they stall.

Shrimps and worms among first animals to recover after largest mass extinction

Reconstructed sea bed scenes (A) Pre-extinction, (B-D) Induan (early Early Triassic), (E) Smithian, (F) Spathian
Credit: Yaqi Jiang

Researchers studying ancient sea bed burrows and trails have discovered that bottom burrowing animals were among the first to bounce back after the end-Permian mass extinction.

In a new study, published today in the journal Science Advances, researchers from China, the USA and the UK, reveal how life in the sea recovered from the event, which killed over 90 percent of species on Earth, from their observations of trace fossils.

Life was devastated by the end-Permian mass extinction 252 million years ago, and recovery of life on Earth took millions of years for biodiversity to return to pre-extinction levels. But by examining trails and burrows on the South China sea bed, the international team were able to piece together sea life’s revival by pinpointing what animal activity was happening when.

Professor Michael Benton from the University of Bristol’s School of Earth Sciences, a collaborator on the new paper, said: “The end-Permian mass extinction and the recovery of life in the Early Triassic are very well documented throughout South China.

“We were able to look at trace fossils from 26 sections through the entire series of events, representing seven million crucial years of time, and showing details at 400 sampling points, we finally reconstructed the recovery stages of all animals including benthos, nekton, as well as these soft-bodied burrowing animals in the ocean.”

Falling stardust, wobbly jets explain blinking gamma ray bursts

A close-up view of the disk (in orange) tilting, causing the jets (in purple) to wobble.
Credit: Ore Gottlieb/Northwestern University

A Northwestern University-led team of astrophysicists has developed the first-ever full 3D simulation of an entire evolution of a jet formed by a collapsing star, or a “collapsar.”

Because these jets generate gamma ray bursts (GRBs) — the most energetic and luminous events in the universe since the Big Bang — the simulations have shed light on these peculiar, intense bursts of light. Their new findings include an explanation for the longstanding question of why GRBs are mysteriously punctuated by quiet moments — blinking between powerful emissions and an eerily quiet stillness. The new simulation also shows that GRBs are even rarer than previously thought.

The new study was published today (June 29) in Astrophysical Journal Letters. It marks the first full 3D simulation of the entire evolution of a jet — from its birth near the black hole to its emission after escaping from the collapsing star. The new model also is the highest-ever resolution simulation of a large-scale jet.

“These jets are the most powerful events in the universe,” said Northwestern’s Ore Gottlieb, who led the study. “Previous studies have tried to understand how they work, but those studies were limited by computational power and had to include many assumptions. We were able to model the entire evolution of the jet from the very beginning — from its birth by a black hole — without assuming anything about the jet’s structure. We followed the jet from the black hole all the way to the emission site and found processes that have been overlooked in previous studies.”

New Kangaroo Described from Papua New Guinea

Artist's impression of Nombe Rockshelter Megafauna, showing the Nombe kangaroo on the Right.
Image resized using AI by SFLORG
 Credit: Artwork Courtesy Peter Schouten

Australian paleontologists from Flinders University have described a new genus of giant fossil kangaroo from the mountains of central Papua New Guinea.

The new description of the fossil kangaroo has found that, rather than being closely related to Australian kangaroos, it most likely belongs to a unique genus of more primitive kangaroo found only in PNG.

The kangaroo, first described in 1983 by Professor Tim Flannery, is known from fossils around 20,000-50,000 years old. They come from the Nombe Rockshelter, an archaeological and paleontological site in Chimbu Province, Papua New Guinea.

Nombe is already known for multiple extinct species of kangaroo and giant four-legged marsupials called diprotodontids.

Flinders University researchers have renamed the animal Nombe nombe, after the location of its discovery – and plan to return to PNG for further excavations and research next year.

The squat, muscular Nombe lived in a diverse montane rainforest with thick undergrowth and a closed canopy. Here, it evolved to eat the tough leaves from trees and shrubs, with a thick jaw bone and strong chewing muscles.

Cancer drug shows potential as treatment for muscular dystrophy

Dr. Farshad Babaeijandaghi
Source UBC

Researchers at UBC’s School of Biomedical Engineering have discovered that an existing cancer drug could have potential as a treatment for muscular dystrophy.

The researchers found that the drug — known as a colony-stimulating factor 1 receptor (CSF1R) inhibitor — helped slow the progress of Duchenne muscular dystrophy in mice by increasing the resiliency of muscle fibers.

The findings were published today in Science Translational Medicine.

“This is a class of drug that is already being used in clinical trials to treat rare forms of cancer,” says Dr. Farshad Babaeijandaghi, a postdoctoral fellow at UBC and first author on the study. “To find that it could potentially serve a double purpose as a treatment for muscular dystrophy is incredibly exciting. It shows a lot of promise, and with further testing, could help extend and improve quality of life for patients.”

Duchenne muscular dystrophy (DMD) is a severe genetic disorder that leads to progressive muscle weakness and degeneration due to disruptions to the protein dystrophin, which helps keep muscle cells intact. It is the most common congenital disease in Canada, affecting about one out of every 3,500 males, and in rarer cases, females.

DMD symptoms typically appear in early childhood, with patients facing increased loss of muscle function as they age. As the disease progresses, many patients are forced to rely on mobility aids, such as a wheelchair, with the disease eventually impacting heart and lung function. While improvements in cardiac and respiratory care have increased life expectancy in recent decades, there is currently no cure.

New Organomineral Fertilizers Created in the Urals

A new type of fertilizer was created in the Ural.
Credit: Anastasia Mavrenkova

New organomineral fertilizers have been developed in the Ural. They are based on magnesium, sulfur, silicon, calcium and poultry manure. The manure contains organics (carbon), nitrogen, potassium, and phosphorus. These fertilizers are more effective than organic fertilizers and safer than mineral fertilizers. They can be used for growing plants and for soil regeneration. This is a new kind of fertilizer (analogues consist of peat and other mineral components), registered under the trademark "Organomin". With favorable developments, the production of fertilizers on an industrial scale will begin this year. Now the developer, the company Nika PetroTech, a member of the Ural Interregional Research and Education Center, is in the process of registering a patent, which they expect to receive in the fall.

"Often chicken droppings are used as organic fertilizer by the poultry farms themselves. They grow plants for birds and animals in the fields. However, there are two difficulties. Firstly, often manure is put in excessive amounts - 20-30 tons per hectare, which adversely affects the soil and groundwater. Secondly, since manure contains a large amount of pathogenic microflora, it takes up to six months to decompose. In our case, after adding the mineral component, the manure can be used in a day. Moreover, according to preliminary calculations, our fertilizer is not much needed for productive plant growth - no more than one ton per hectare," explains Sergey Yakovlev, Head of the Engineering and Technological Department of Nika PetroTech.

Physicists confront the neutron lifetime puzzle

To solve a long-standing puzzle about how long a neutron can “live” outside an atomic nucleus, physicists entertained a wild but testable theory positing the existence of a right-handed version of our left-handed universe. They designed a mind-bending experiment at the Department of Energy’s Oak Ridge National Laboratory to try to detect a particle that has been speculated but not spotted. If found, the theorized “mirror neutron” — a dark-matter twin to the neutron — could explain a discrepancy between answers from two types of neutron lifetime experiments and provide the first observation of dark matter.

“Dark matter remains one of the most important and puzzling questions in science — clear evidence we don’t understand all matter in nature,” said ORNL’s Leah Broussard, who led the study published in Physical Review Letters.

Neutrons and protons make up an atom’s nucleus. However, they also can exist outside nuclei. Last year, using the Los Alamos Neutron Science Center, co-author Frank Gonzalez, now at ORNL, led the most precise measurement ever of how long free neutrons live before they decay, or turn into protons, electrons and anti-neutrinos. The answer — 877.8 seconds, give or take 0.3 seconds, or a little under 15 minutes — hinted at a crack in the Standard Model of particle physics. That model describes the behavior of subatomic particles, such as the three quarks that make up a neutron. The flipping of quarks initiates neutron decay into protons.

Shining some light on the obscure proteome

Group Leader in Chemical Proteomics, Dr. Guillaume Médard, and his research group in the lab.
 Credit: Uli Benz / TUM

Mass-spectrometry based proteomics is the big-data science of proteins that allows to monitor the abundances of thousands of proteins in a sample at once. It is therefore a particularly well suited readout to discover which proteins are targeted by any small molecule. An international research team has investigated this using chemical proteomics.

Histone deacetylase (HDAC) inhibitors are a class of drugs used in oncology. An international research team involving scientists at the Technical University of Munich (TUM), Cornell University in Ithaca (USA), the German Cancer Research Center (DKFZ) in Heidelberg and Martin Luther University of Halle-Wittenberg has now investigated the effects of some HDAC drugs in more detail. The scientists wanted to know whether those epidrugs engage proteins other than the HDACs which they are designed to inhibit.

“To do so, target deconvolution by chemical proteomics is the method of choice. Hence, we first made new chemical tools - the so called affinity matrices - that would allow us to systematically profile the HDACs,” explains Dr. Guillaume Médard, group leader for chemical proteomics at the TUM chair of Proteomics and Bioanalytics led by Prof. Bernhard Küster.

“I profiled 53 drugs”, details Severin Lechner, doctoral candidate at the TUM School of Life Sciences. “Most of them, but not all, hit their intended HDAC target. However there were some surprises. Drugs used in hundreds of scientific studies were not as selective as assumed. Many had additional targets that were not previously known.

Research brings new light to unsolved genetic diseases in children

Asst Prof Xue and her team in NUS study the effects of maternal SMCHD1 gene mutations on offspring.
Source: National University of Singapore

The study highlights the role of genes inherited from mothers in genetic diseases in children, and improves the understanding of such diseases

The development of an embryo is a well-orchestrated string of processes, ensuring correct formation and positioning of vital organs of the growing organism. At the molecular level, these processes are controlled in a precise manner by switching on or off specific factors such as genes or proteins. Any errors in these processes could result in physical defects or disease in the newborn organism.

A team of scientists from the National University of Singapore (NUS) led by Assistant Professor Xue Shifeng from the Department of Biological Sciences has discovered a new way to interpret unsolved Mendelian diseases – diseases inherited from either parent due to gene mutations in the developing egg or sperm – through studying the inheritance of a protein known as SMCHD1 which is coded by the SMCHD1 gene. Mutations in the SMCHD1 gene can cause diseases such as facioscapulohumeral muscular dystrophy (FSHD) which is a muscle degenerative disorder, and Bosma arhinia microphthalmia syndrome (BAMS) which causes abnormalities of the nose and eyes.

The researchers found that SMCHD1 from mothers controls the expression of a group of genes in offspring, known as the HOX genes, which determines the position of body parts in an embryo along the axis from its head to tail. The researchers also found that the inactivation of SMCHD1 in female zebrafish results in alterations to HOX gene expression leading to skeletal defects in their offspring.

The study led by NUS researchers, in collaboration with A*STAR, Yale-NUS and Aix-Marseille University, was published in Nature Communications.