Organic luminescent materials have been highlighted as an exciting research topic owing to their prominent potentials in light-emitting diodes, fluorescent sensors, optoelectronic devices, in vivo imaging, anti-counterfeiting, data storage, and information encryption. However, applications of tunable fluorescent materials in the solid states have been largely hampered because these luminescent systems generally require time-consuming organic synthesis procedures and suffer from reduced photoluminescence (PL) owing to the notorious aggregation caused quenching. Aggregation-induced ...

As an elementary type of collective excitation, plasmon has been found to dominate the optical properties of metals. The collective behavior of electrons in plasmons reflects the important difference between condensed matter and molecule-like ones. It is of great significance to study the evolution of plasmonic response and find out the boundary. Controversy exists on such interesting questions as the division between the nanoparticle and molecules, and the physics of mesoscopic and microscopic plasmonic evolution. A unified understanding covering the small and large size limit, namely macro / meso / micro scales with sufficiently atomic precision is thus required. Clusters, as the transition from atomic molecules to condensed matter, are the ideal candidate for studying the evolution ...

Making people stand in front of a scanner to have their body temperature read can result in a large number of false negatives, allowing people with Covid-19 to pass through airports and hospitals undetected. A new study argues that taking temperature readings of a person's fingertip and eye would give a significantly better and more reliable reading and help identify those with fever. The study, co-led by human physiologist and an expert in temperature regulation, Professor Mike Tipton, is published in Experimental Physiology. Professor Tipton, ...

Dinitrogen (N2) fixation is considered as one of the most essential tasks in basic science, providing straightforward methods to produce ammonia and nitrogen-containing molecules. Exploring the reactivity of N2 units of transition metal-nitrogen complexes is of great significance and challenging in the chemistry. Since the first Ru-N2 complex was prepared in 1965, important progress has been made in the synthesis and reactivity of transition metal nitrogen complexes. In many cases, terminal end-on M-N2 complexes as the most prevalent bonding mode were proved ...

In a new study, an international research team led by Sebastian Stumpf from the University of Vienna describes an exceptionally well-preserved skeleton of the ancient shark Asteracanthus. This extremely rare fossil find comes from the famous Solnhofen limestones in Bavaria, which was formed in a tropical-subtropical lagoon landscape during the Late Jurassic, about 150 million years ago. The almost complete skeleton shows that Asteracanthus was two-and-a-half meters long in life, which makes this ancient shark one of the largest of its time. The study is published in the journal Papers in Palaeontology. Cartilaginous fishes, which include sharks and rays, are one of the most successful vertebrate groups still ...

Climate and changes in it have direct impacts on species of plant and animals - but climate may also shape more complex biological systems like food webs. Now a research group from the University of Helsinki has investigated how micro-climate shapes each level of the ecosystem, from species' abundances in predator communities to parasitism rates in key herbivores, and ultimately to damage suffered by plants. The results reveal how climate change may drastically reshape northern ecosystems. Understanding the impact of climatic conditions on species interactions is imperative, as these interactions include such potent ecological forces as herbivory, pollination and parasitism. Lead researcher Tuomas Kankaanpaa from the Faculty of Agriculture and Forestry, University of Helsinki, investigated ...

Astronomers using images from Kitt Peak National Observatory and Cerro Tololo Inter-American Observatory have created the largest ever map of the sky, comprising over a billion galaxies. The ninth and final data release from the ambitious DESI Legacy Imaging Surveys sets the stage for a ground-breaking 5-year survey with the Dark Energy Spectroscopic Instrument (DESI), which aims to provide new insights into the nature of dark energy. The map was released today at the January 2021 meeting of the American Astronomical Society. For millennia humans have used maps to understand and navigate our world and put ourselves in context: we rely on maps to show us where we are, where we came from, and where we're going. Astronomical maps continue this tradition on a vast scale. They ...

University of Otago researchers have added another piece to the puzzle about how best to translocate New Zealand lizards for conservation purposes - confine them. In a paper just published in the New Zealand Journal of Ecology, the Department of Zoology researchers outlined how they translocated 19 barking geckos to Mana Island, using the method of penned release - enclosing them in a 100m² pen for three months so they get used to the site and hopefully establish a breeding population. It was the first time such a method had been used with the species and the researchers found it worked well. The geckos' area use decreased over time, indicating ...

There are many components to aging, both mental and physical. When it comes to the infrastructure of the human body - the musculoskeletal system that includes muscles, bones, tendons and cartilage - age-associated decline is inevitable, and the rate of that decline increases the older we get. The loss of muscle function -- and often muscle mass -- is scientifically known as sarcopenia or dynapenia. For adults in their 40s, sarcopenia is hardly noticeable -- about 3% muscle mass is lost each decade. For those aged 65 years and older, however, muscle decline can become much more rapid, with an average loss of 1% muscle mass each year. More importantly, sarcopenia is also marked by a decrease ...

Since 2013, China has implemented the strictest ever air pollution control policies, which resulted in substantial reductions in aerosol concentrations. However, extreme and persistent haze events frequently occur during wintertime in China. In winter haze events, aerosol-related reductions of surface solar radiation (SSR) have comparable impacts on clouds over eastern provinces. Recently, researchers from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences and the Pacific Northwest National Laboratory of the United States (PNNL) and their collaborators conducted a study to further understand the underlying chemical mechanisms driving winter haze events and how ...

A new type of stem cell - that is, a cell with regenerative abilities - could be closer on the horizon, a new study led by UNSW Sydney shows. The stem cells (called induced multipotent stem cells, or iMS) can be made from easily accessible human cells - in this case, fat - and reprogrammed to act as stem cells. The results of the animal study, which created human stem cells and tested their effectiveness in mice, was published online in Science Advances today - and while the results are encouraging, more research and tests are needed before any potential translation ...

Males are more likely to test positive for COVID-19, more likely to have complications and more likely to die from the virus than females, independent of age, according to a new study published this week in the open-access journal PLOS ONE by Farhaan Vahidy of Houston Methodist Research Institute, US, and colleagues. As the COVID-19 pandemic unfolds and evolves across the globe, researchers have identified population sub-groups with higher levels of disease vulnerability, such as those with advanced age or certain pre-existing conditions. Small studies from China and Europe have indicated that males tend to experience higher disease ...

KAIST metabolic engineers presented the bio-based production of multiple short-chain primary amines that have a wide range of applications in chemical industries for the first time. The research team led by Distinguished Professor Sang Yup Lee from the Department of Chemical and Biomolecular Engineering designed the novel biosynthetic pathways for short-chain primary amines by combining retrobiosynthesis and a precursor selection step. The research team verified the newly designed pathways by confirming the in vivo production of 10 short-chain primary amines by supplying the precursors. Furthermore, the platform Escherichia ...

Women who are young, "conventionally attractive" and appear and act feminine are more likely to be believed when making accusations of sexual harassment, a new University of Washington-led study finds. That leaves women who don't fit the prototype potentially facing greater hurdles when trying to convince a workplace or court that they have been harassed. The study, involving more than 4,000 participants, reveals perceptions that primarily "prototypical" women are likely to be harassed. The research also showed that women outside of those socially determined norms ...

WASHINGTON -- Women who do not fit female stereotypes are less likely to be seen as victims of sexual harassment, and if they claim they were harassed, they are less likely to be believed, according to research published by the American Psychological Association. "Sexual harassment is pervasive and causes significant harm, yet far too many women cannot access fairness, justice and legal protection, leaving them susceptible to further victimization and harm within the legal system," said Cheryl Kaiser, PhD, of the University of Washington and a co-author of the study published in the Journal of Personality and Social Psychology. "Our research found that a claim was deemed less ...

In experiments in mouse tissues and human cells, Johns Hopkins Medicine researchers say they have found that removing a membrane that lines the back of the eye may improve the success rate for regrowing nerve cells damaged by blinding diseases. The findings are specifically aimed at discovering new ways to reverse vision loss caused by glaucoma and other diseases that affect the optic nerve, the information highway from the eye to the brain. "The idea of restoring vision to someone who has lost it from optic nerve disease has been considered science fiction for decades. ...

DALLAS - Jan. 13, 2021 - A new treatment that combines two existing medications may provide long-sought relief for many battling debilitating methamphetamine use disorder, according to a study to be published tomorrow in The New England Journal of Medicine. The article, based on a multisite study funded by the National Institutes of Health (NIH), describes how combining an injectable drug currently used to treat alcohol and opioid addictions (naltrexone), and a commonly prescribed antidepressant (bupropion) produced positive results in 13.6 percent of the 403 patients treated, significantly higher than the 2.5 percent response in placebo ...

Lithium-ion batteries (LIB) are widely used for daily products in our life, such as hybrid cars, cell phone, etc. but their charge/discharge process is not fully understood yet. To understand the process, behaviors of lithium ion, distribution and chemical composition and state, should be revealed. A research group in Institute for Molecular Science noticed on a scanning transmission X-ray microscope (STXM, shown in Fig. 1) as a powerful technique to perform X-ray absorption spectroscopy (XAS) with high spatial resolution. By using absorption edge of a specific ...

Researchers led by Tokyo Medical and Dental University (TMDU) find that certain oral pathogens are more prevalent in esophageal cancer patients, and could be used as a novel diagnostic tool Tokyo, Japan - It is increasingly clear that the trillions of bacteria that make themselves at home in and on the human body are more than just casual observers along for the ride. Gut bacteria in particular have been shown to have an enormous influence on human health, with studies suggesting they play a role in illnesses ranging from autoimmune disorders to anxiety and depression. The oral cavity is another rich source of microbial diversity, ...

A research group from Kumamoto University, Japan has developed a highly sensitive technique to quantitatively evaluate the extent of cytoskeleton bundling from microscopic images. Until now, analysis of cytoskeleton organization was generally made by manually checking microscopic images. The new method uses microscopic image analysis techniques to automatically measure cytoskeleton organization. The researchers expect it to dramatically improve our understanding of various cellular phenomena related to cytoskeleton bundling. The cytoskeleton is a ...

Data from the DESI (Dark Energy Spectroscopic Instrument) Legacy Imaging Surveys have revealed over 1200 new gravitational lenses, approximately doubling the number of known lenses. Discovered using machine learning trained on real data, these warped and stretched images of distant galaxies provide astronomers with a flood of new targets with which to measure fundamental properties of the Universe such as the Hubble constant, which describes the expanding Universe. Astronomers hunting for gravitational lenses utilized machine learning to inspect the vast dataset known as the DESI Legacy Imaging Surveys, uncovering 1210 new lenses. The data were collected at Cerro Tololo Inter-American Observatory (CTIO) and Kitt Peak National Observatory (KPNO), ...

URBANA, Ill. ¬- Illinois residents value efforts to reduce watershed pollution, and they are willing to pay for environmental improvements, according to a new study from agricultural economists at the University of Illinois. Nutrient runoff from agricultural production is a major cause of pollution in the Mississippi River Basin and contributes to hypoxia - limited oxygen to support sea life in the Gulf of Mexico. The U.S. Environmental Protection Agency (EPA) set up action plans to reduce pollution in 12 midwestern states and reduce transmissions of nitrate-nitrogen and phosphorus by 45% in 2040. Illinois agencies have established the Illinois Nutrient Loss Reduction Strategy (INLRS) to ...

Recently there has been a reemergence of interest in optical computing platforms for artificial intelligence-related applications. Optics/photonics is ideally suited for realizing neural network models because of the high speed, large bandwidth and high interconnectivity of optical information processing. Introduced by UCLA researchers, Diffractive Deep Neural Networks (D2NNs) constitute such an optical computing framework, comprising successive transmissive and/or reflective diffractive surfaces that can process input information through light-matter interaction. These surfaces are designed using standard deep learning techniques ...

CORVALLIS, Ore. - Researchers at Oregon State University have found that the blue orchard bee, an important native pollinator, produces female offspring at higher rates in the aftermath of wildfire in forests. The more severe the fire had been, the greater percentage of females - more than 10% greater in the most badly burned areas relative to areas that burned the least severely. "This is one of the first studies that has looked at how forest fire severity influences bee demography," said Jim Rivers, an animal ecologist with the OSU College of Forestry. "Sex ratio varied under different fire conditions but the number of young produced did not, which indicates bees ...

A first-of-its-kind, international study of 107,000 children finds that higher temperatures are an equal or even greater contributor to child malnutrition and low quality diets than the traditional culprits of poverty, inadequate sanitation, and poor education. The 19-nation study is the largest investigation of the relationship between our changing climate and children's diet diversity to date. It is believed to be the first study across multiple nations and continents of how both higher temperatures and rainfall--two key results of climate change--have impacted children's diet diversity. "Certainly, future climate changes have been predicted to affect malnutrition, but it surprised ...