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Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>
The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>
Caring for the health of our pets is an important aspect of the life of every dog owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>
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Bacterial vampirism
28.04.2024
Some of the deadliest bacteria react to human blood and rush to it, since its serum contains substances that serve as food for them. American scientists studied this phenomenon, which was called “bacterial vampirism.”
The Enterobacteriaceae family of bacteria includes both representatives of the normal microflora of the human body and a large number of pathogens, including salmonella and E. coli.
Some enterobacteriaceae are associated with gastrointestinal bleeding and bacteremia and are considered a leading cause of death from sepsis in people with inflammatory bowel disease. However, the behavior of these microorganisms and the mechanisms that encourage them to enter the bloodstream are not well understood. A team of specialists from the University of Washington and the University of Oregon (both in the USA) took on the task of filling the gap.
Researchers have found that blood serum attracts at least three types of pathogenic bacteria: Salmonella enterica, Escherichia coli and Citrobacter koseri. One of the substances attractive to them was the amino acid L-serine present in the blood, which is involved in the construction of almost all natural proteins. By the way, it is often included in protein shakes.
Using an experimental setup called the Chemosensory Injection Rig Assay (CIRA), developed by one of the authors, the researchers simulated intestinal bleeding outside a living organism and used a powerful microscope to observe in real time the reaction of pathogens to tiny injections of blood serum. It took the bacteria less than a minute to find a “food source.”
In addition, the study revealed that Salmonella bacteria have a special protein receptor Tsr, which allows them to hear blood serum and be directed to it. Using protein crystallography, the scientists were able to see how the chemoreceptor atoms bind to L-serine. It is through this mechanism that bacteria recognize the amino acid and then consume it.
By mapping the phylogenetic distribution of the Tsr chemoreceptor, the researchers discovered its presence not only among Enterobacteriaceae, but also in the families Morganelliaceae and Yersiniaceae. This suggests that other pathogenic microorganisms are also capable of reacting to blood serum.
By understanding how bacteria can detect the source of bleeding, a new drug that blocks this ability could be developed in the future. Such drugs will help improve the lives and health of patients with inflammatory bowel disease, who are at high risk of bloodstream infections.
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