Fast light pulse triggers the charge transfer into the water

The study was only made possible by the new laser laboratories in the ZEMOS research building, in which all external interference signals are minimized.
Photo Credit: © RUB, Marquard

With new technology, researchers were able to observe live what happens in the first picosecond when a proton detaches from a dye after light.

In certain molecules, the so-called photoc acids, a proton can be released locally by excitation with light. The solution suddenly changes the pH - a kind of fast switch that is important for many chemical and biological processes. So far, however, it is still unclear what actually happened at the moment of proton release. This is exactly what researchers in the Ruhr Explores Solvation Cluster of Excellence could do RESOLV the Ruhr University Bochum is now experimentally observing using new technology. They saw a tiny quake that only lasted three to five picoseconds before the proton came loose. They report on this in the journal Chemical Sciences.

Scientists Get Closer to Curing Alzheimer's and Parkinson's Diseases

In Russia, the incidence of dementia, Parkinson's disease and Alzheimer's disease will reach the epidemiological threshold of 5%
Image Credit: Gerd Altmann

Prospective compounds for the treatment of neurodegenerative diseases have been synthesized by Russian scientists. The compounds are of great interest for medicinal chemistry, especially for the development of treatments for Alzheimer's and Parkinson's diseases.

According to Timofey Moseev, a member of the group and an employee of the UrFU Chemical Pharmaceutical Center, the researchers managed to test the toxicity of the compounds in vitro on the kidney cells of a healthy human embryo. The researchers used the strategy of nucleophilic hydrogen substitution (a substitution reaction in which the substrate is attacked by a nucleophile, a reagent that carries a pair of unshared electrons). The process does not require metal catalysis, which is particularly important in the production of biologically active compounds, where any metal impurity can significantly distort toxicity and activity data.

To assess the ability of the synthesized molecules to bind to biotargets (proteins that play an important role in a particular disease), the researchers conducted experiments using docking - a molecular modeling technique. Docking allows predicting with a certain probability how a molecule interacts with targeted proteins.

Predatory dinosaurs such as T. rex sported lizard-like lips

A juvenile Edmontosaurus disappears into the enormous, lipped mouth of Tyrannosaurus.
Illustration Credit Dr Mark Witton

A new study suggests that predatory dinosaurs, such as Tyrannosaurus rex, did not have permanently exposed teeth as depicted in films such as Jurassic Park, but instead had scaly, lizard-like lips covering and sealing their mouths.

Researchers and artists have debated whether theropod dinosaurs, the group of two-legged dinosaurs that includes carnivores and top predators like T. rex and Velociraptor, as well as birds, had lipless mouths where perpetually visible upper teeth hung over their lower jaws, similar to the mouth of a crocodile.

However, an international team of researchers challenge some of the best-known depictions, and say these dinosaurs had lips similar to those of lizards and their relative, the tuatara - a rare reptile found only in New Zealand, which are the last survivors of an order of reptiles that thrived in the age of the dinosaurs.

In the most detailed study of this issue yet, the researchers examined the tooth structure, wear patterns and jaw morphology of lipped and lipless reptile groups and found that theropod mouth anatomy and functionality resembles that of lizards more than crocodiles. This implies lizard-like oral tissues, including scaly lips covering their teeth.

Watch nanoparticles grow into crystals

Liquid-phase TEM video of layer-by-layer growth of a crystal with smooth surface from gold concave nanocubes. Surface particles on the growing crystal are tracked (center positions overlaid with yellow dots).

For the first time ever, researchers have watched the mesmerizing process of nanoparticles self-assembling into solid materials. In the stunning new videos, particles rain down, tumble along stairsteps and slide around before finally snapping into place to form a crystal’s signature stacked layers.

Led by Northwestern University and the University of Illinois, Urbana-Champaign, the research team says these new insights could be used to design new materials, including thin films for electronic applications.

The research was published today (March 30) in the journal Nature Nanotechnology. 

Described by the researchers as an “experimental tour de force,” the study used a newly optimized form of liquid-phase transmission electron microscopy (TEM) to gain unprecedented insights into the self-assembly process. Before this work, researchers used microscopy to watch micron-sized colloids — which are 10 to 100 times larger than nanoparticles — self-assemble into crystals. They also have used X-ray crystallography or electron microscopy to visualize single layers of atoms in a crystalline lattice. But they were unable to watch atoms individually move into place.

“We know that atoms use a similar scheme to assemble into crystals, but we have never seen the actual growth process,” said Northwestern’s Erik Luijten, who led the theoretical and computational work to explain the observations. “Now we see it coming together right in front of our eyes. By viewing nanoparticles, we are watching particles that are larger than atoms, but smaller than colloids. So, we have completed the whole spectrum of length scales. We are filling in the missing length.”

Was plate tectonics occurring when life first formed on Earth?

Plate tectonics melts and mixes rocks to create magmas with specific chemical makeups. Rochester geologists are using that chemical evidence to unlock information about plate tectonic activity on Earth more than 4 billion years ago.
Photo Credit: Tetiana Grypachevska

Zircon crystals and magmas reveal new information about plate tectonic activity on Earth billions of years ago.

Earth is a dynamic and constantly changing planet. From the formation of mountains and oceans to the eruption of volcanoes, the surface of our planet is in a constant state of flux. At the heart of these changes lies the powerful force of plate tectonics—the movements of Earth’s crustal plates. This fundamental process has shaped the current topography of our planet and continues to play a role in its future.

But what was plate tectonic activity like during early Earth? And was the process even occurring during the time when life is thought to have formed?

“The dynamic tectonic nature of the modern Earth is one of the reasons why life exists today,” says Wriju Chowdhury, a postdoctoral research associate in the lab of Dustin Trail, an associate professor of earth and environmental sciences at the University of Rochester. “Exploring the geodynamics and the lithological diversity of the early Earth could lead to revelations of how life first began on our planet.”

AI predicts enzyme function better than leading tools

An Illinois research team created an AI tool to predict an enzyme’s function from its sequence using the campus network and resource group servers. Pictured, from left: Tianhao You, Haiyang (Ocean) Cui, Huimin Zhao and Guangde Jiang.   
Photo Credit: Fred Zwicky

A new artificial intelligence tool can predict the functions of enzymes based on their amino acid sequences, even when the enzymes are unstudied or poorly understood. The researchers said the AI tool, dubbed CLEAN, outperforms the leading state-of-the-art tools in accuracy, reliability and sensitivity. Better understanding of enzymes and their functions would be a boon for research in genomics, chemistry, industrial materials, medicine, pharmaceuticals and more.

“Just like ChatGPT uses data from written language to create predictive text, we are leveraging the language of proteins to predict their activity,” said study leader Huimin Zhao, a University of Illinois Urbana-Champaign professor of chemical and biomolecular engineering. “Almost every researcher, when working with a new protein sequence, wants to know right away what the protein does. In addition, when making chemicals for any application – biology, medicine, industry – this tool will help researchers quickly identify the proper enzymes needed for the synthesis of chemicals and materials.”

The researchers will publish their findings in the journal Science and make CLEAN accessible online March 31.

Allies or enemies of cancer: the dual fate of neutrophils

Neutrophils infiltrating tumors are heterogeneous and different neutrophil types can have opposing effects on cancer progression. The image shows artistic rendering of a lung tumor nodule (in blue) infiltrated by various neutrophil types (shown in green, orange and red) including some (in red) that are expanded by immunotherapy and are required for tumor elimination.
Illustration Credit: © Mate Kiss, Evangelia Bolli and Mikael Pittet

An international team including scientists from the UNIGE and Harvard has discovered a new type of immune cell whose action is essential for the success of immunotherapies.

Why do cancer immunotherapies work so extraordinarily well in a minority of patients, but fail in so many others? By analyzing the role of neutrophils, immune cells whose presence usually signals treatment failure, scientists from the University of Geneva (UNIGE), from Harvard Medical School, and from Ludwig Cancer Center have discovered that there is not just one type of neutrophils, but several. Depending on certain markers on their surface, these cells can either promote the growth of tumors, or fight them and ensure the success of a treatment. By boosting the appropriate factors, neutrophils could become great agents of anti-tumor immunity and reinforce the effects of current immunotherapies. These results can be read in Cell.

Ultrasmall swirling magnetic vortices detected in iron-containing material

Simulation capturing the different swirling textures of skyrmions and merons observed in ferromagnet thin film.
Image Credit: University of Edinburgh/based on microscopy images collected by Argonne on samples prepared at MagLab

Microelectronics forms the foundation of much modern technology today, including smartphones, laptops and even supercomputers. It is based on the ability to allow and stop the flow of electrons through a material. Spin electronics, or spintronics, is a spinoff. It is based on the spin of electrons, and the fact that the electron spin along with the electric charge creates a magnetic field.

“This property could be exploited for building blocks in future computer memory storage, brain-like and other novel computing systems, and high-efficiency microelectronics,” said Charudatta Phatak, group leader in the Materials Science division at the U.S. Department of Energy’s (DOE) Argonne National Laboratory.

A team including researchers at Argonne and the National High Magnetic Field Laboratory (MagLab) discovered surprising properties in a magnetic material of iron, germanium and tellurium. This material is in the form of a thin sheet that is only a few to 10 atoms in thickness. It is called a 2D ferromagnet.

The team discovered that two kinds of magnetic fields can coexist in this ultrathin material. Scientists call them merons and skyrmions. They are like miniature swirling storm systems dotting the flat landscape of the ferromagnet. But they differ in their size and swirling behavior.

A key mechanism that controls human heart development discovered

A human cardiac organoid (Cardioid), one of the models the researchers used to reconstruct human cardiac development in 3D. Cardiac mesoderm stage human Cardioid visualizing Phalloidin (grey) and β-catenin (Magenta).
Image Credit: Deniz Bartsch

Writing in ‘Science Advances’ researchers of the University of Cologne describe a key mechanism that controls the decision-making process that allows human embryonic stem cells to make the heart. These discoveries enable better insights into how the human heart forms in an embryo and what can go wrong during heart formation, causing cardiac disease or, in the worst case, embryo termination.

In humans, a specialized mRNA translation circuit predetermines the competence for heart formation at an early stage of embryonic development, a research team at the Center for Molecular Medicine Cologne (CMMC) and the University of Cologne’s Cluster of Excellence in Aging Research CECAD led by Junior Professor Dr Leo Kurian has discovered. While it is well known that cardiac development is prioritized at the early stages of embryogenesis, the regulatory program that controls the prioritization of the development of the heart remained unclear until now. Kurian and his team investigated how the prioritization of heart development is regulated at the molecular level. They found that the protein RBPMS (RNA-binding protein with multiple splicing) is responsible for the decision to make the heart by programming mRNA translation to approve future cardiac fate choice. The study is published under the title ‘mRNA translational specialization by RBPMS presets the competence for cardiac commitment’ in Science Advances.

“Exquisite” sabertooth skull offers clues about Ice Age predator

Dave Easterla, left, Distinguished University Professor Emeritus of Biology at Northwest Missouri State University and Matthew Hill, associate professor of anthropology at Iowa State, with a fossilized complete skull from a sabertooth cat from southwest Iowa.
Photo Credit: Christopher Gannon/Iowa State University.

The recent discovery of a sabertooth cat skull in southwest Iowa is the first evidence the prehistoric predator once inhabited the state.

The chance of finding any fossilized remains from a sabertooth cat is slim, said Matthew Hill, an associate professor of archaeology at Iowa State and expert on animal bones. The remarkably well-preserved skull found in Page County is even rarer, and its discovery offers clues about the iconic Ice Age species before its extinction roughly 12-13,000 years ago.

“The skull is a really big deal,” said Hill. “Finds of this animal are widely scattered and usually represented by an isolated tooth or bone. This skull from the East Nishnabotna River is in near perfect condition. It’s exquisite.”

Hill analyzed the specimen in collaboration with David Easterla, Distinguished University Professor Emeritus of Biology at Northwest Missouri State University. Their findings are newly published in Quaternary Science Reviews.