1. The kinetics of the inactivation of photosynthesis by 2537 A in Chlorella pyrenoidosa and Scenedesmus D(1) indicate that, while the destruction process is largely a first order effect, higher order effects also occur, which become evident at low exposures. In agreement with previous observations, endogenous respiration is insensitive to exposures which inactivate photosynthesis. 2. In Scened...

Bee bread is a food product obtained by fermenting bee pollen with honey and storing it in honeycomb cells. In this fermentation, phenolic compounds remain unaffected unchanged. contains approximately; there are 35% sugar, 24-35% carbohydrate, 20-22% protein, 3.5% lactic acid, 2.43% mineral, 1.6% lipid fat. Within the scope of study, biocompatible iron nanoparticles were synthesized (BB@FeNPs) ...

Background and purpose: Despite growing use of energy-saving lamps or compact fluorescent lamps (CFLs), there are concerns about ultraviolet radiation in their output. In this study, the output of CFLs available in Iranian market in the range of infrared, visible, and ultraviolet were measured and the possibility of hydroxyl radical production by their radiation was evaluated. Materials and me...

The present study was undertaken to study the sunscreen activity of herbal formulation. There is no evidence of the sun protection factor (SPF) studies on essential oil of Calendula flowers (Calendula officinalis L., Asteraceae). The study investigates the in vitro SPF by ultraviolet specrtophotometry method of Calendula flower oil in a cream formulation. Calendula oil was isolated by Clavenger...

Hill, Ruth F. (Columbia University, New York, N.Y.). Relationship between ultraviolet sensitivity and ability to propagate ultraviolet-irradiated bacteriophage. J. Bacteriol. 88:1283-1287. 1964.-Mutants with a reduced ability to propagate ultraviolet-damaged bacteriophage T(1) were isolated from Escherichia coli strain B/r. The change in this ability varied from a slight to a very marked loss; ...

N Habrobracon, unfertilized eggs develop normally and become haploid males; I fertilized eggs become diploid females. It has been observed that when newlylaid eggs from virgin females are exposed to ultraviolet radiation on the nuclear (convex) surfaces, embryo hatchability decreases as the exposure time is increased (VON BORSTEL and MOSER 1956; VON BORSTEL and WOLFF 1955). Most of the deaths o...

Ultraviolet radiation-induced cataract has been believed to be associated with degradation of cellular components. We report that, in cultured human lens epithelial cells, UV radiation analogous to H2O2 treatment down-regulates desmosomal protein desmoglein-2. UV radiation induces generation of reactive oxygen species and transiently activates epidermal growth factor receptor, which in turn ind...

The incidence of melanoma and nonmelanoma skin cancers is increasing worldwide. Ultraviolet light exposure is the most important risk factor for cutaneous melanoma and nonmelanoma skin cancers. Nonmelanoma skin cancer includes basal cell carcinoma and squamous cell carcinoma. Constitutive skin color and genetic factors, as well as immunological factors, play a role in the development of skin ca...

We report on the operation of a novel laser system delivering high-energy pulses in the near-infrared region. The pulses are nearly Fourier-transform limited ~time-bandwidth product of 0.48!, providing narrow-band radiation (;1.5 GHz), with an energy of 225 mJ and 10 Hz repetition rate. The pulse duration of 320 ps covers the intermediate region between Q-switched and mode-locked lasers, and pr...