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Presentation of twins in Der Rosengarten ("The Rose Garden"), a German standard medical text for midwives published in 1513. In obstetrics, the presentation of a fetus about to be born specifies which anatomical part of the fetus is leading, that is, is closest to the pelvic inlet of the birth canal.
The Adrian Flatt hand collection is a collection of plaster and bronze casts of human hands on display at the Baylor University Medical Center in Dallas, Texas.The casts were created by orthopedic surgeon Dr. Adrian Flatt (1921—2017), and the collection features the hands of various former United States presidents, actors, athletes, scientists, musicians, artists, astronauts, and other ...
A distinctive feature of the Walloon sword is the presence of a thumb-ring, and it was therefore not ambidextrous. The most common hilt type featured a double shell guard and half-basket, though examples exist with hand protection ranging from a shell and single knuckle-bow to a full basket. [26]
Hand sanitizer (also known as hand antiseptic, hand disinfectant, hand rub, or handrub) is a liquid, gel, or foam used to kill viruses, bacteria, and other microorganisms on the hands. [ 3 ] [ 4 ] It can also come in the form of a cream, spray, or wipe. [ 5 ]
Shoulder presentations are uncommon (about 0.5% of births) [1] since, usually, toward the end of gestation, either the head or the buttocks start to enter the upper part of the pelvis, anchoring the fetus in a longitudinal lie. It is not known in all cases of shoulder presentation why the longitudinal line is not reached, but possible causes ...
The d- and l-isomers are the same compound but are called enantiomers. An equimolar mixture of the two optical isomers, which is called a racemic mixture, will produce no net rotation of polarized light as it passes through. [19] Left handed molecules have l- prefixed to their names; d- is prefixed to right handed molecules.
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Chemical compounds that come as mirror-image pairs are referred to by chemists as chiral or handed molecules. [1] Each twin is called an enantiomer. Drugs that exhibit handedness are referred to as chiral drugs. Chiral drugs that are equimolar (1:1) mixture of enantiomers are called racemic drugs and these are obviously devoid of optical rotation.