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Новости за 21.06.2023

What Canadian wildfires signify for climate, public health

Phys.org 

Smoke from hundreds of wildfires in eastern Canada shrouded the Northeast and Midwest in a dense ochre haze this month, and more smoke could return to both regions of the United States this week as the conflagrations continue.

Photonic integration: Transforming the future of chip-scale applications

Phys.org 

In the realm of photonics, the integration of multiple optical devices onto a single substrate holds immense promise for a wide range of applications. This revolutionary approach, known as photonic integration, offers remarkable advantages, including reduced size, cost, and power consumption. Among the major integration technologies in photonics, two stand out: indium phosphide (InP)-based photonic integration and monolithic silicon photonics. Each technology has its unique strengths and weaknesses.

Antarctic ice shelves experienced only minor changes in surface melt since 1980, study finds

Phys.org 

Antarctic ice shelves have experienced only minor changes in surface melt rates over the past four decades, unlike the rapid increase in surface melt experienced by Greenland's glaciers during the same time period, according to new research. The news is not cause for celebration just yet, though—the researchers expect Antarctic ice shelf surface melt rates to increase substantially in the coming decades due to rising global air temperatures.

Heterostructure lets excitons carry more information for quantum applications

Phys.org 

Excitons are electron-hole pairs in semiconductors that are electrostatically bound by strong Coulombic interactions. In ultrathin 2D semiconductors that are a few atoms thick (typically ~0.7 nm), the decreased z-dimension presents strong quantum confinement and reduced dielectric effects that feature a plethora of stable excitonic species (neutral excitons, trions, biexcitons, defect-bound excitons).

Researchers reveal new molecular mechanism for stimulating hair growth

Phys.org 

The process by which aged (senescent) pigment-making cells in the skin cause significant growth of hair inside skin moles, called nevi, has been identified by a research team led by the University of California, Irvine. The discovery may offer a road map for an entirely new generation of molecular therapies for androgenetic alopecia, a common form of hair loss in both women and men.



Biologists document genome-level climate adaptation in endangered bird species

Phys.org 

As the climate changes, living things must adapt to new environmental conditions in one of two ways—either geographically or genetically. While it's relatively simple for scientists to track and record a species' geographic movements, proving their genetic adaptation over time can be much more difficult.

Understanding the cation effect on the CO coupling reaction at the electrochemical interface

Phys.org 

Recently, the National Science Review published research from Prof. Jun Cheng (Xiamen University) and Dr. Jia-Bo Le (Ningbo Institute of Materials Technology and Engineering of Chinese Academy of Sciences). The research team used ab initio molecular dynamics simulation methods to study the microscopic properties of the electrochemical interface, and then applied these findings to understand the mechanism behind the cation effect on the selectivity of C2 products in the electrocatalytic reduction of carbon monoxide.

Detecting and estimating satellite maneuvers more accurately

Phys.org 

Researchers from the Universidad Carlos III de Madrid (UC3M), Polytechnic University of Milan and the company GMV have developed a new methodology for detecting and estimating satellite maneuvers that improves the operation of the systems currently in use. This development, which is already being tested in operational environments, may help reduce the problem of space debris.

New dataset reveals more female diplomats in the world today

Phys.org 

The United Nations has designated 24 June as International Day of Women in Diplomacy. A new dataset was recently published that documents the share of women and men among the world's ambassadors. The research program Gender in Diplomacy (GenDip) at the University of Gothenburg has developed the dataset, which will enable entirely new types of analyzes.

Discovery of novel primitive xeno nucleic acids as alternative genetic polymers adds piece to origin of life puzzle

Phys.org 

The chemical origin of life on Earth is a puzzle that scientists have been trying to piece together for decades. Many hypotheses have been proposed to explain how life came to be and what chemical and environmental factors on early Earth could have led to it. A step required in a number of these hypotheses involves the abiotic synthesis of genetic polymers—materials made up of a sequence of repeating chemical units with the ability to store and pass down information through base-pairing interactions.

DNA can fold into complex shapes to execute new functions

Phys.org 

DNA can mimic protein functions by folding into elaborate, three-dimensional structures, according to a study from researchers at Weill Cornell Medicine and the National Heart, Lung, and Blood Institute, part of the National Institutes of Health.





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