Two types of photoreceptors are found in the median ocellus of Limulus. One type is maximally sensitive to ultraviolet (UV) light, the other to green light; they are called UV and VIS cells, respectively. Biphasic receptor potentials, consisting of a small initial hyperpolarizing phase and a later slow depolarizing phase, can be recorded from both receptor types. These biphasic responses are el...

Ultra-violet (UV) and middle wavelength sensitive (M) cone responses were identified in the ERG of normal and Rpe65 -/- mice using chromatic flashes and selective chromatic adaptation. In normal mice, the UV-cone response was as large as, or larger, in the presence of a bright yellow adapting light than it is in the presence of a dim white light. The M-cone response became undetectable in the p...

UV light provoked stress can evoke antioxidant defence system and consequently induces the synthesis of several phytochemical compounds. Th e aim of the present study was to investigate the infl uence of UV-B light irradiation on surface colour and synthesis of some bioactive compounds in apples skin of cultivars ‘Elstar’ and ‘Jonagold’. Half of each apple was shaded with aluminium foil to comp...

Our objective was to determine whether a stabilized form of nitric oxide (NO) such as an S-nitrosothiol, rather than NO itself, is the vasoactive metabolite produced when glyceryl trinitrate (GTN) interacts with vascular smooth muscle. In a control study, NO formation was measured by a chemiluminescence-headspace gas method during the incubation of a prototype S-nitrosothiol, namely, S-nitroso-...

Ultraviolet (UV) irradiation inhibited sulfur oxidation by cells of Thiobacillus thiooxidans. Sulfur-oxidizing activity decreased as the exposure time to UV light increased. A loss of the ability of cells of fix CO(2) paralleled the loss of sulfur-oxidizing activity. UV light photoinactivated ubiquinone purified from T. thiooxidans. The same percentage of sulfur-oxidizing activity and ubiquinon...

Further Investigation Into the Risk of Skin Cancer AssociatedWith theUse of UVNail Lamps Use of UV radiation in nail salons for drying and curing polishes has come under scrutiny owing to concerns for carcinogenesis.1,2 A few recent studies evaluated potential irradiation scenarios and concluded that UV nail polish drying lamps pose only a small risk to clients.3 However, these studies lacked r...

Although the power conversion efficiency of perovskite solar cells has increased from 3.81% to 22.1% in just 7 years, they still suffer from stability issues, as they degrade upon exposure to moisture, UV light, heat, and bias voltage. We herein examined the degradation of perovskite solar cells in the presence of UV light alone. The cells were exposed to 365 nm UV light for over 1,000 h under ...

Abstract:  The optimum dose of UV irradiation to produce gynogenesis rainbow trout, Oncorhynchus mykiss with emphasis of Hertwing effect and photoreactivation (PR) was investigated. For this purpose, the sperm of rainbow trout were inadiated with UV at 2010±200 µw.cm-2 intensity in different alternatives of 0, 1, 3, 5, 8, 10, 15, 20, 25, 35 and 45 minutes and allowed to ferti...

The fate of ultraviolet-induced, thymine-containing dimers in the deoxyribonucleic acid (DNA) of Bacillus subtilis was investigated in both the wild type (UV(R)) and an ultraviolet light-sensitive (UV(S)) mutant. During incubation in the dark, dimers were excised from the DNA of the UV(R)B. subtilis, but remained in the DNA of the UV(S) mutant. About 40% of the excised dimers recovered in the w...

In Arabidopsis, the circadian clock regulates UV-B-mediated changes in gene expression. Here it is shown that circadian clock components are able to inhibit UV-B-induced gene expression in a gene-by-gene-specific manner and act downstream of the initial UV-B sensing by COP1 (CONSTITUTIVE PHOTOMORPHOGENIC 1) and UVR8 (UV RESISTANCE LOCUS 8). For example, the UV-B induction of ELIP1 (EARLY LIGHT ...