The photodegradation of the azobenzene chromophore DR1 {4-[N-ethyl-N-(2-hydroxyethyl)amino]-4(?)-nitroazobenzene]} incorporated as a side chain or as a guest in a poly(methyl) methacrylate host has been evaluated as a function of wavelength, temperature, and the atmospheric environment. The effects of these variables on the lifetime of DR1-based electro-optic devices is quantified.

The aggregation and disaggregation behaviors of red blood cells were investigated in 17 normotensive and 21 hypertensive subjects with a laser reflectometry technique, and simultaneous measurements were taken of blood viscosity with a coaxial viscometer. Increased red blood cell aggregation (26%, p less than 0.001) and disaggregation shear rate (20%, p less than 0.01) and shear stress (18%, p l...

Free radicals are implicated in several diseases of prematurity. The study aimed to correlate plasma antioxidants levels and lipid peroxidation between maternal and cord blood in normal and preterm deliveries. Superoxide dismutase (SOD), Reduced Glutathione (GSH) and Uric acid were the measured antioxidants while Malondialdehyde (MDA) was an index of lipid peroxidation. 32 mothers who delivered...

In this article we describe the structure of a hybrid zone in Argyll, Scotland, between native red deer (Cervus elaphus) and introduced Japanese sika deer (Cervus nippon), on the basis of a genetic analysis using 11 microsatellite markers and mitochondrial DNA. In contrast to the findings of a previous study of the same population, we conclude that the deer fall into two distinct genetic classe...

The success or failure of many organisms to respond to the challenges of habitat destruction and a warming climate lies in the ability of plant species to disperse between isolated habitats or to migrate to new ranges. European semi-natural grasslands represent one of the world’s most species-rich habitats at small scales, but agricultural intensification during the 20th century has meant that ...

However, the popularity of the method, which was initially very high, has declined precipitously.8 Sales of the device fell from 800 per day in the first quarter of 1994 to about 60 per day in April 1995; the U. S. distributor speculated that “adverse publicity and negative word-of-mouth” drove the decline.9 While both the IUD and oral contraceptives have suffered declines in use attributed to ...