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Craig Melvin. Craig Delano Melvin[ 1 ] (born May 20, 1979) is an American broadcast journalist and anchor at NBC News and MSNBC. In August 2018, he became a news anchor on NBC's Today and, in October 2018, a co-host of Today Third Hour before being made permanent in January 2019, and Melvin also serves as a fill-in & substitute anchor for Today ...
Cefalexin. Cefalexin, also spelled cephalexin, is an antibiotic that can treat a number of bacterial infections. [4] It kills gram-positive and some gram-negative bacteria by disrupting the growth of the bacterial cell wall. [4] Cefalexin is a β-lactam antibiotic within the class of first-generation cephalosporins. [4]
Today (also called The Today Show) is an American morning television show that airs weekdays from 7:00 a.m. to 11:00 a.m. on NBC. The program debuted on January 14, 1952. It was the first of its genre on American television and in the world, and after 72 years of broadcasting it is fifth on the list of longest-running United States television ...
The cephalosporins (sg. / ˌsɛfələˈspɔːrɪn, ˌkɛ -, - loʊ -/ [ 1 ][ 2 ]) are a class of β-lactam antibiotics originally derived from the fungus Acremonium, which was previously known as Cephalosporium. [ 3 ] Together with cephamycins, they constitute a subgroup of β-lactam antibiotics called cephems.
Contents. Discovery and development of cephalosporins. Cephalosporins are a broad class of bactericidal antibiotics that include the β-lactam ring and share a structural similarity and mechanism of action with other β-lactam antibiotics (e.g. penicillins, carbapenems and monobactams). [ 1 ] The cephalosporins (and other β-lactams) have the ...
Sheinelle Jones. Sheinelle Marie Jones (born April 19, 1978) is an American journalist and a news anchor and correspondent for NBC News. She is one of the hosts of the third hour of Today on weekdays. She is also the host of the educational nature program Wild Child broadcast on The More You Know block on NBC.
The history of penicillin follows observations and discoveries of evidence of antibiotic activity of the mould Penicillium that led to the development of penicillins that became the first widely used antibiotics. Following the production of a relatively pure compound in 1942, penicillin was the first naturally-derived antibiotic.
Dylan Marie Dreyer (born August 2, 1981) [ 1 ] is an American television meteorologist working for NBC News. She is also an anchor on Today's 3rd Hour. Dreyer frequently appears on Today on weekdays as a weather correspondent and as a fill-in for Al Roker and Carson Daly. She also appears on The Weather Channel and on NBC Nightly News.