[\bar 110]\)direction of the surface. From this calculated structure, an STM image was simulated (Fig.1g) that correlates well to the experimental result. One can identify that the adamantane groups reflect the two large lobes of the STM image while the dimethylamine is responsible for the ...
pKa of Acids & Functional Groups | Overview & Examples from Chapter 13 / Lesson 7 41K Explore the concepts of pKa and pH values and how they relate to acids and bases. Learn the trends in pKa value for functional groups, acids, and bases with examples. Related...
They can, however, knock an electron away from an atom altogether. Some of the energy from the X-ray photon works to separate the electron from the atom, and the rest sends the electron flying through space. A larger atom is more likely to absorb an X-ray photon in this way, because...
X-rays come from a change in the electron structure of an atom and are mostly machine-produced. They aren't quite as penetrating as gamma rays, and just a few millimeters of lead can stop them. That's why you wear a "lead apron" when receiving medical X-rays. Overexposure to ionizing...
N-type - In N-type doping, phosphorus or arsenic is added to the silicon in small quantities. Phosphorus and arsenic each have five outer electrons, so they're out of place when they get into the silicon lattice. The fifth electron has nothing to bond to, so it's free to move around...
The scanner uses the energy signatures of those ions and sluggish photons to produce images that identify organic material, like your arms and legs, or nonorganic objects, such as weapons or that belt buckle you forgot to remove before screening. The differences are often easy to see, even to...
In the new study, the authors used macrophage cells and mice infected with a coronavirus to identify PARPs, specifically PARP12 and PARP14, as host-cell ADP-ribosylating enzymes important for the attenuation of macrodomain-mutant viruses. The findings showed that the macrodomain is required to ...
(a negatively charged particle). An anti-hydrogen atom consists of an anti-proton, which has the same mass as a proton, but is negatively charged, and a positron, which has the same mass as an electron, but is positively charged. When matter and antimatter come into contact, they ...
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A photon is produced whenever an electron in a higher-than-normal orbit falls back to its normal orbit. During the fall from high energy to normal energy, the electron emits a photon -- a packet of energy -- with very specific characteristics. The photon has a frequency, or color, that...