Einstein is right again! LIGO detects gravitational waves emitted by the merger of two unequal mass black holes
Recently, LIGO released a unique gravitational wave signal GW190412, which is generated by two black hole merger events with a mass of about 8 times and 30 times that of the Sun. The fusion of black holes with huge mass differences has allowed researchers to detect high-frequency harmonics of gravitational wave signals for the first time. The huge mass difference means that the properties of the system can be measured more accurately, such as the distance between the black hole and the earth, and how fast the heavy black hole rotates around its axis. This result also verifies for the first time the untested predictions in Einstein's general theory of relativity.
Paper address: https://arxiv.org/pdf/2004.08342.pdf
Viruses carried by bats can make koala "AIDS"
Researchers from the Burnet Institute of Australia and the Australian Federal Scientific and Industrial Research Organization (CSIRO) discovered an endogenous gamma retrovirus associated with koala retrovirus (KoRV) in Australian bats and Asian bats. This virus can cause koala to suffer from AIDS-like diseases, which may lead to the extinction of the latter.
Paper address: https://www.pnas.org/content/early/2020/04/08/1915400117
sugar-free cola has no internal flavor, sugar substitutes cannot deceive the intestine
Columbia University Researchers found that the body can sense the difference between sugar substitutes and sugar. After drinking sugar water, the mice had obvious excitement in the caudal lateral side of the solitary bundle (cNST), while after drinking Aceme (sugar-saccharide) solution and water, this part of the activity was very weak. The caudal part of the solitary nucleus is responsible for receiving information from the digestive tract, respiratory tract and cardiovascular. The researchers infer that the digestive tract that can best sense the difference between sugar and sugar substitutes is the digestive tract.
Paper address: https://www.nature.com/articles/s41586-020-2199-7
Adipocytes can "actively lose weight" to repair skin damage
Recently, the Yale University research team found that after the skin is damaged, the fat in the dermis will self-distribute fatty acids to induce macrophage immunity; the fat cells spit out the inventory and turn into fibroblasts to repair skin damage.
Previously, researchers from the University of Bristol in the UK also used advanced imaging techniques to record how fat cells "heal" us.
Paper address: https://www.cell.com/cell-stem-cell/fulltext/S1934-5909(20)30105-3#%20
Inspiration was exhausted, and it may not be used to drink coffee
The University of Arkansas conducted a study on the impact of caffeine on creative thinking—randomly given 88 volunteers 200 mg of caffeine pills and an equal amount of placebo, thereby conducting standard cognitive tests for aggregated thinking, divergent thinking, and working memory. Research shows that although caffeine can help people improve their problem-solving abilities, it has no effect on creativity.
Paper address:
https://www.sciencedirect.com/science/article/abs/pii/S1053810019303435?via%3Dihub=
Recovered patients with new coronary pneumonia may be infected with secondary
Shandong University and Jinan Infectious Disease Hospital found that the new coronavirus can exist in patients who produce specific antibodies for a long time. It has been found that SARS-CoV-2 and specific IgG antibodies in two patients have been coexisted for up to 50 days. Studies have shown that the production of specific antibodies is not a necessary condition for clearing SARS-CoV-2, and some individuals may not produce antibodies after infection with SARS-CoV-2.
Paper address: https://www.medrxiv.org/content/10.1101/2020.04.13.20040980v1
Crabbit-eating macaques who have been vaccinated with the new coronavirus will also have asymptomatic infections
Dutch Research team inoculated the Crabbit-eating macaques with SARS-CoV-2 virus. It was found that without clinical symptoms, the virus can be excreted from the nose and throat of the macaques and detected in type I and type II lung cells of diffuse alveolar injury lesions and ciliary epithelial cells of the nasal, bronchial and bronchiole mucosa. This can be used as a new model for studying COVID-19 infection.
Paper address: https://science.sciencemag.org/content/early/2020/04/16/science.abb7314
Alcohol-induced DNA damage can be safely repaired
In fact, acetaldehyde accumulation can cause DNA damage, which in turn causes a rare autosomal or X chromosome recessive genetic disease FA, clinical manifestations are progressive bone marrow failure, malignant hematologic tumors, etc. But recently, researchers from the Hubrecht Institute of the Royal Academy of Sciences and the UK MRC Laboratory of Molecular Biology have discovered that alcohol-induced DNA crosslinking can be repaired through two different mechanisms, which is expected to find strategies to treat FA and even reduce the incidence of alcohol-induced cancer.
Paper address: https://www.nature.com/articles/s41586-020-2059-5
" Artificial Brain " is not far from us
Recently, the University of Massachusetts Amherst found an artificial synaptic alternative. When studying protein nanowires, researchers proposed a neuromorphic memory resistor (or "memory transistor") whose working voltage level is in the same range as the brain, and it can be described as an "artificial brain". This resistor can also learn like the human brain.
Paper address: https://www.nature.com/articles/s41467-020-15759-y
A new drone will transform into a mimosa after it loses control and will never hit the wall again
To solve the problem of quadrotor drone hitting the wall after it loses control, professor at City University of Hong Kong Inspired by traditional origami, a deformable anti-collision quadrotor drone was designed. The quadrotor drone folds the rigid fuselage like a mimosa when it is triggered, protecting fragile and important components from subsequent drops to the ground.
Paper address: https://ieeexplore.ieee.org/document/8767926
Software Robot Remote Control New Solution
University of Wisconsin-Madison School of Mechanical Engineering has realized remote control of software robots through a new method of remote sensing of soft composite materials using magnetic fields to rearrange their internal structures into various new styles. Since the use of magnetic fields eliminates the need to contact cables directly, new soft materials may be useful for applications such as medical implants.
Paper address: https://phys.org/news/2020-04-advance-enable-remote-soft-robots.html
Plants are also under pressure. Using the carbon nanotube sensor, you can sense
MIT (MIT) engineers use sensors made by carbon nanotubes to embed the device into plant leaves and report based on hydrogen peroxide signal waves, thereby closely tracking the process of plants facing stress, such as injury, infection and photodamage.
Thesis address: https://www.nature.com/articles/s41477-020-0632-4
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