Science
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Astronomy Webb telescope reaches L2 orbit The Webb Space Telescope completed its final heading correction and entered the orbit of the second Lagrange Point (L2), which is about 1.5 million kilometers from Earth, at 2 p.m. eastern time on January 24, NASA reported. At present, the primary mirror and secondary mirror of the Webb telescope have been completed. After the telescope enters the L2 point orbit, engineers will begin a three-month complex debugging process to adjust the optical system of the telescope to a precision close to nanometer. The Webb telescope is expected to take the first image of the universe this summer.
By gaisndm Hawkshaw3 years ago in Earth
There is no news in the scientific community today. Maybe this is the biggest news.
If a scientific study brings new discoveries, then its value is self-evident. However, behind these glamorous studies, many studies that have not found significant results are slightly lonely and do not even get the opportunity to be published, although they are also of great value to the development of science. With the joint efforts of scientists and the academic publishing community, this situation is changing.
By gaisndm Hawkshaw3 years ago in Earth
It rains only one day a year at night, but that's not all the wonder of the planet.
WASP-121b is probably the most thoroughly studied exoplanet. It was discovered in 2015, with a mass of 1.18 times that of Jupiter, a radius of 1.81 times that of Jupiter, and an orbit period of 30.6 hours. In 2017, astronomers even found water in its stratosphere. Today, abnormal data in spectral analysis show that the planet will even rain gems.
By jsyeem shekels3 years ago in Earth
Global science
Where does time and space come from? Immunological IMMUNOLOGY When the vaccine is "ineffective" In this epidemic, organ transplant recipients and people with low immunity are faced with a dilemma: the first shot of the vaccine is ineffective, the second dose is effective, but does not provide adequate protection. Because the immune system is damaged or suppressed by drugs, they are unable to produce enough antibodies under the stimulation of the vaccine. Therefore, no matter how effective the vaccine is, it is difficult to help them. But the dilemma is not unsolved, and scientists are working with patients to try different solutions. For example, multiple vaccinations, optimized vaccination strategies, or the use of special antibodies.
By jsyeem shekels3 years ago in Earth
How toxic is nail polish? its ingredient is harmful to reproductive health, but it has been ignored by us.
. How much "poison" does it take to get a manicure? In the new study, led by Canadian scholars, 45 manicurists in Toronto, Canada, were observed, and the researchers placed three kinds of air sampling devices on their shoulders, chest and wrists: an active sampler with an air pump, placed on the manicurist's left shoulder, and two passive samplers made into badges and wristbands, with badges on the right and wristbands on their habitual hands. Within an average of eight hours of sampling time, air samples from the main breathing areas of the manicurists at work and the forefront of exposure to manicure products-the hand area-were brought into the laboratory to be tested by scientists, targeting plasticizers such as phthalates (phthalates) and organophosphates (organophosphate esters) that manicurists may be exposed to. In recent years, more and more evidence shows that they are endocrine disruptors, which will affect human reproductive health and fetal neural development.
By jsyeem shekels3 years ago in Earth
The mother found an answer after she became a scientist when the child died suddenly.
The secret of some children's unexplained death may be hidden in DNA. Some children die for some reason. In the summer of 1997, Maria, the 15-month-old daughter of Laura Gould, had a fever one night. The next morning, the child seemed to be getting better and would dance to the TV. Maria is asleep at noon, and Laura is going to take her to the doctor later. But the child never woke up.
By jsyeem shekels3 years ago in Earth
Global science
Medical science Why are women more likely to suffer from Alzheimer's disease than men? In previous studies, they have found that the activation of C/EBP β / AEP signaling pathway can promote α-amyloid production and Tau protein accumulation, which is a key factor leading to neurodegenerative diseases. In the new study, they found that follicle-stimulating hormone (follicle-stimulating hormone,FSH) significantly affected these signaling pathways in postmenopausal women. In their blood, the concentration of FSH is about 10 times higher than it was before menopause, while the concentration of this hormone in men is only 2-3 times higher. It has been found that when FSH binds to the FSH receptor on neurons, it can activate the C/EBP β / AEP signal pathway, which leads to Alzheimer's disease. Using female mice with hysterectomy, they found that the pathological characteristics and cognitive impairment of mice were alleviated when anti-FSH antibodies were used to reduce the concentration of FSH in the blood or to inhibit the binding of FSH to its receptors in the hippocampus of the brain. In addition, injecting male mice with FSH also increased their risk of developing Alzheimer's disease.
By jsyeem shekels3 years ago in Earth
Global science
Health Less than one hour of muscle intensive training a week can help reduce the risk of death. Recently, a study published in British Journal of Sports Medicine found that 30 to 60 minutes of muscle intensive training per week can reduce the risk of death from all causes of death, cardiovascular disease, diabetes and cancer (10% to 20%), but it is not clear whether more than one hour of training per week will further reduce the risk of death.
By jsyeem shekels3 years ago in Earth
Believe in science
Astronomy There are about 40 million, 000 black holes in the universe. The number of black holes in the universe is one of the urgent questions to be answered in the field of modern astrophysics and cosmology. In a recent study published in the Astrophysical Journal, scientists calculated for the first time that the number of constant-star black holes (with masses ranging from a few to hundreds of solar masses that originated at the end of the life of massive stars). Most black holes in the universe belong to constant-star black holes, and it is estimated that there are about 400 billion black holes in the observable universe.
By gaisndm Hawkshaw3 years ago in Earth
