Low Temperature Spectrophotometry of Biological Materials

Low-temperature spectrophotometry

Photoreactions of the fourth rhodopsin-like pigment, phoborhodopsin (pR480), of Hulobacrerium halobium were studied by low-temperature spectrophotometry. Upon irradiation of pR480 at -80 as well as 170°C with 436 nm light, a new intermediate having a difference absorption maximum at about 520 nm was produced. We designate this intermediate ‘P520’. Prolonged irradiation caused the formation of a...

The determination of copper in biological materials by flame spectrophotometry.

A method for the determination of the copper content of biological materials by flame spectrophotometry is described. The effects of interference by ions such as sodium and phosphate were eliminated by isolating copper as the dithizonate in CCl(4). Results obtained for the urinary excretion of copper by a patient with Wilson's disease before and after treatment with penicillamine are reported.

The determination of magnesium in biological materials by atomic absorption spectrophotometry.

HIGH TEMPERATURE ELASTIC PROPERTIES OF REFRACTORY MATERIALS

Abstract: A pulse-echo technique, based on ultrasonic "long-bar" mode (LBM) velocity measurements, working up to 1700°C is described. Magnetostrictive transducers and ultrasonic lines used in a 40-85 kHz frequency range are detailed. The conditions of choice of fundamental parameters (frequency, line geometry, sample size) are discussed in relation with the nature and the microstructure of ...

Low Temperature Plasma Interaction with Biological Matter

Historical Perspective Following a few preliminary works on the inactivation of bacteria by low temperature plasma (LTP) reported in mid to late 1990’s [1]-[3] AFOSR established a small funded program aiming to evaluate the effects of plasma on biological cells. This program was managed by the Electronics and Physics Directorate of the US Air Force Office of Scientific Research (AFOSR). This pr...