منابع مشابه
Rontgen Rays in Dermatology
r The authors of this book on the value of " Rontgen days !" Dermatology," unfortunately for English readers, Ascribe only the different kinds of German apparatus, instead of giving the type of apparatus employed in a particular case. The section on X-ray dermatitis and the biological effects of X-rays is excellent and is illustrated by coloured plates. The chapters deal with the affections of ...
متن کاملThe Movements of the Intestines Studied Means of the Rontgen Rays?
Introduction .......................... The method .......................... The movements of the small intestine ................. Rhythmic segmentation of the intestinal contents .......... Peristalsis ........................ Rhythmic segmentation and the pendulum movement ........ The course of the food in the small intestine ........... The competence of the ileocaecal valve ................
متن کاملSunlight and Vitamin D
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3. Previtamin D3 and vitamin D3 also absorb UV B radiation and are converted into a variety of photoproducts some of which have unique b...
متن کاملSunlight and skin cancer
It is well known that chronic exposure to ultraviolet (UV) radiation present in sunlight is responsible for the induction of most nonmelanoma skin cancer (NMSC) in humans. Wavelengths in the UV-B (290–320 nm) region of the solar spectrum are absorbed into the skin, producing erythema, burns,and eventually skin cancer.NMSC is themost common type of human cancer. Recent surveys indicate that arou...
متن کاملColor Naming and Sunlight
Lindsey and Brown (2002) proposed an intriguing explanation for the existence and geographical distribution of languages that lack a distinct word for the color blue. Many such languages include blue in a color term that also encompasses green, yielding a green-or-blue (‘‘grue’’) term. Others include blue in a color term that also encompasses dark colors such as black, yielding a black-or-blue ...
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ژورنال
عنوان ژورنال: Science
سال: 1896
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.3.62.357-a