During the past fifty years, many investigators have studied the bactericidal activity of ultra violet light, but a review of their reports shows that little has been learned about many essential factors in the reaction. There have been few contributions to a knowledge of the quantitative relations involved. Little precise information is available on differences in resistance of individual bact...

We consider the ultraviolet divergence structure of general noncommutative super-symmetric U (N c) gauge theories, and seek theories which are all-orders finite. September 2001

We treat the action for a bosonic membrane as a sigma model, and then compute quantum corrections by integrating out higher membrane modes. As in string theory, where the equations of motion of Einstein’s theory emerges by setting β = 0, we find that, with certain assumptions, we can recover the equations of motion for the background fields, i.e. Rμν +(1/4)FμαβγμF αβγ ν = 0 and DFαβγ = 0. for t...

A synchrotron light monitor is an essential tool for operating a storage ring. For SPEAR3, the upgrade of the SPEAR storage ring, the light monitor was designed not only for monitoring the beam presence but also to measure beam parameters. To minimize diffraction effects, UV light around 200 nm is used to image the electron source rather than visible light. At 200 nm, the rms diffraction spot i...

Radiation from the sun has different effects upon living organisms. It has been found, for instance, that ultra-violet rays of a certain wavelength present in the radiation from the sun stop the multiplication of bacteria and other micro-organisms. Good use can be made of this, without having to depend upon sunlight, by employing a low-pressure, mercury-vapour lamp emitting rays which have a sp...

Typhoid bacilli are about one two-hundredth as sensitive to ultraviolet light of wave-lengths 2100 to 2800 Angström units as is the photographic plate. This sensitivity then falls off, decreasing rapidly to almost zero sensitivity at about 2970, the beginning of the sun's spectrum.

The normal skin is from 0.5 to 10 millimetres thick, varying from place to place in the body, and consists of two layers, the epidermis and the dermis. The more superficial layer of the skin is the avascular epidermis which consists of stratified epithelium accurately moulded on the papillae of the corium , or true skinThe lowest or the deepest layer of the epidermis is known as the basal layer...

This little book, written in a charming literary style, is an exposition of our knowldege of radiation in general and the application to medicine of the rays of that part of the spectrum known as the ultra-violet region. In his foreword Sir Oliver Lodge says it is a book dealing with a comparatively new and highly promising subject by people with medical training, physical knowledge, and extens...

By a systematic study of the blood of normal rabbits (1), it was found that both the absolute and relative amounts of calcium and inorganic phosphorus exhibited periodic variations and that, among animals living in the laboratory, there was evidence of a tendency toward a progressive increase in calcium and of a decided decrease in inorganic phosphorus of uncertain duration and extent. I t appe...

This paper describes a method of estimating the nucleotides in red blood cells. The technique used is based on that of Cohn and Carter (1950), who have shown that the nucleotides, adenosinemonophosphate (A.M.P.), adenosinediphosphate (A.D.P.), and adenosinetriphosphate (A.T.P.) can be separated by an anion exchange column. Bartlett, Savage, Hughes, and Marlow (1953) have successfully used this ...