Новости за 25.01.2021

Gonadotropins are any hormones that are released from the anterior pituitary to stimulate the gonads, or sex glands, to carry out their reproductive functions. The gonadotropin-releasing hormone (GnRH) is therefore fundamental for mammalian reproduction. In a healthy reproductive system GnRH is produced by the brain in pulses. Reports suggest that at least 25% of ovarian disorders are due to dysfunction of the brain mechanism controlling the release of gonadotropins, which is a kind of reproductive disorder associated with the hypothalamus.

A survey of dog owners from across the U.S. shows that when it comes to seeking veterinary care for dogs, barriers to access—including a lack of trust—have more effect on the decision-making process than differences in race, gender or socioeconomic status. The results could aid veterinarians in developing outreach strategies for underserved communities.

A new theory that could explain how unconventional superconductivity arises in a diverse set of compounds might never have happened if physicists Qimiao Si and Emilian Nica had chosen a different name for their 2017 model of orbital-selective superconductivity.

Scientists at Tokyo Institute of Technology (Tokyo Tech), Imperial and High Energy Accelerator Research Organization (KEK) Institute of Materials Structure Science, discover new Ba7Nb4MoO20-based materials with high oxygen-ion (oxide-ion O2-) conductivities—"the hexagonal perovskite-related oxides"—and shed light on the underlying mechanisms responsible for their conductivity. Their findings lead the way to uncovering other similar materials, furthering research on developing low-cost and scalable renewable energy technologies.

President Joe Biden teed up a slew of clean air and carbon issues as top environmental priorities for his administration in a new executive order signed this week.

A team of researchers at the University of California, San Diego, has developed a deep neural network system to identify features that may predict transcription factor binding. In their paper published in the journal Nature Machine Intelligence, the group describes their system possible uses for better understanding transcription-factor-based diseases.

A team of researchers from the University of California, Lawrence Berkeley National Laboratory, the Nuclear Research Center—Negev and the National High Magnetic Field Laboratory has developed a way to isolate antiferromagnet (AFM) heterostructures in the absence of a ferromagnet (FM) to study the coupling that occurs between AFM order parameters and spin-glass parameters. In their paper published in the journal Nature Physics, the group describes an exchange bias set in a spin-glass phase that could arise in a disordered antiferromagnet. Читать дальше...

Optical investigations and manipulations often form the core of biological experiments. In a new report now published in Science Advances, Kazuki Okamato and a team of scientists in pharmaceutical sciences, neuroscience, medicine, physics and artificial intelligence at the University of Tokyo, Japan, introduced a new borosilicate glass material containing a rare-earth ion terbium (III) (Tb3+). The material emitted green fluorescence upon blue light excitation, much like green fluorescent protein... Читать дальше...

Quantum key distribution (QKD) is a technique that enables secure communications between devices using a cryptographic protocol that is partly based on quantum mechanics. This communication method ultimately allows two parties to encrypt and decrypt messages they send to each other using a unique key that is unknown to other parties.

Using the Suzaku satellite, astronomers have examined a very high energy (VHE) blazar known as PKS 2155−304. They found that the source exhibits an X-ray intraday variability, which could improve the understanding of its nature. The finding is reported in a paper published January 15 on arXiv.org.