Men now have one more compelling reason to get a COVID-19 vaccine—doctors suspect the new coronavirus could make it hard to perform in the bedroom.
May 13, 2021
1
693
Propranolol, a drug that is efficacious against infantile haemangiomas ("strawberry naevi," resembling birthmarks), can also be used to treat cerebral cavernous malformations, a condition characterized by misshapen blood ...
Feb 23, 2021
0
222
科学家们at EPFL have used a snap-freezing method to reveal the true structure of the connections that join neurons together in the adult brain.
Jan 18, 2021
0
160
Researchers at Umeå University in Sweden have for the first time at the atomic level succeeded in mapping what a virus looks like that causes diarrhea and annually kills about 50,000 children in the world. The discovery ...
2021年1月11日,
0
209
科学家们have for the first time identified the structure of a protein fiber linked to early-onset type 2 diabetes.
Sep 14, 2020
0
96
Some people are better protected than others against urinary tract infections. This may be because their bodies produce more of a protein called uromodulin. An interdisciplinary research team has now found out exactly how ...
Jul 02, 2020
0
220
Researchers from the Center for Precision Disease Modeling at the University of Maryland School of Medicine (UMSOM) have uncovered a mechanism that appears to explain how certain genetic mutations give rise to a rare genetic ...
Apr 03, 2020
0
24
Many foods—whether it's the mozzarella on your favorite pizza, the olive oil in salad dressing or hollandaise sauce during asparagus season—contain lots of fat. The fatty acids in these foods are among the essential nutrients ...
Mar 17, 2020
0
292
China has been the origin of several major viral epidemics over recent decades, with the current outbreak of a new deadly coronavirus emerging in the central city of Wuhan.
Jan 22, 2020
0
5
Electron cryomicroscopy (cryoEM)—which won the 2017 Nobel prize—could be made 10 times cheaper by reducing the energy of the microscope and creating better detectors for imaging low energy electrons, according to a proof-of-principle ...
Jan 03, 2020
0
2
Anelectron microscopeis a type of microscope that uses a particle beam of electrons to illuminate a specimen and create a highly-magnified image. Electron microscopes have much greater resolving power than light microscopes that use electromagnetic radiation and can obtain much higher magnifications of up to 2 million times, while the best light microscopes are limited to magnifications of 2000 times. Both electron and light microscopes have resolution limitations, imposed by the wavelength of the radiation they use. The greater resolution and magnification of the electron microscope is because the wavelength of an electron; its de Broglie wavelength is much smaller than that of a photon of visible light.
The electron microscope uses electrostatic and electromagnetic lenses in forming the image by controlling the electron beam to focus it at a specific plane relative to the specimen. This manner is similar to how a light microscope uses glass lenses to focus light on or through a specimen to form an image.
This text uses material fromWikipedia, licensed underCC BY-SA
