Normal age-matched guinea pig lenses were compared with those exposed to (1) long-term ultraviolet (UV) light (9 months, 353-nm peak) in vivo, and (2) short-term UV light (3.5 hr, 325 nm) in vitro from a helium-cadmium laser. Tryptophan Raman and 457.9-nm-excited fluorescence profiles along the visual axis (VA) were obtained by taking 21 (for tryptophan) or 11 (for fluorescence) successive spec...

A submersible UV/VIS spectrometer was used to monitor a paper mill wastewater treatment plant. It utilises the UV/VIS range (200–750 nm) for simultaneous measurement of COD, filtered COD, TSS and nitrate with just a single instrument. The instrument measures in-situ, directly in the process. Paper mill wastewater shows typical and reproducible spectra at various process measuring points. There ...

The interaction between N,N'-ethylenebis-[2-(o-hydroxyphenolic)glycine] (EHPG) and lanthanum was studied by the difference UV spectra and fluorescence spectra. At pH 7.4, 0.01 M N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid (Hepes), with the addition of 1.0 x 10(-3)M lanthanum, two new peaks were observed at 238 nm and 294 nm by absorptivity spectroscopy compared with blank solution EHPG s...

We present HST (WFPC2 and FOC) images and UV GHRS spectra plus ground-based optical spectra of four Luminous Infrared Galaxies (LIRGs) that have Seyfert 2 nuclei (Mrk 477, NGC 7130, NGC 5135 and IC 3639). The data provide direct evidence of the existence of a central nuclear starburst that dominates the UV and optical light and are dusty and compact. The bolometric luminosity (∼ 1010 L⊙) of the...

The present study focused on the synthesis of silver nanoparticles using the aqueous extract of Ulva flexousa (green seaweed). Ten ml of the aqueous extract of alga was mixed with 90 ml of 1mM aqueous AgNO3 solution for reducing of Ag+ ions. The synthesized silver nanoparticles were characterized by UV-Vis spectra, XRD (X-ray diffraction), TEM (Transmission electron microscopy) and FT-IR (Fouri...

the main purpose of this paper is to detemine the fine spectrum of the generalized difference operator delta_{uv} over the sequence space c0. these results are more general than the fine spectrum of the generalized difference operator delta_{uv} of srivastava and kumar.

six fluorescent compounds were isolated and characterized in rhizomorph of a. mellea and were presented first as: f , f , f , mf , mf and mf . these compounds differed by rf on chromatoplaque, max in uv spectra and ex, em and max in fluorescence spectra. their gc-ms analysis indicated that f has a phenolic moiety and the other five are the benzenic derivatives. f compound was more fluorescent r...

Vacuum UV circular dichroism (CD) spectra were measured down to 175 nm for d(C)10, d(G)10, the d(G)10.d(C)10 duplex, and the d(G)10.d(G)10.d(C)10 triplex. A CD difference spectrum was calculated for d(G)10.d(C)10 giving the change in CD induced by forming the duplex from d(G)10 and d(C)10. The d(G)10.d(G)10.d(C)10 CD difference spectrum gave the CD induced by triplex formation from binding of d...

We have measured the IR and UV spectra of cytosine in a low-temperature argon matrix. An attempt was made to determine the tautomeric ratios existing in the matrix, making use of the matrix-isolation IR spectrum and computed IR intensities of the tautomers in a least squares fitting procedure. The mole fractions are about 0.22 for oxo(-amino) form, 0.26 and 0.44 for the two rotamers, respective...

As p art of a continuing study of the biochemical transform ation of anilide herbicides and chloroanilines to azobenzenes 11 2, it was necessary to syn­ thesize a num ber of chloroazobenzenes 3’ 4 as analy­ tical standards and for use in tests of biological ac­ tivity. The UV and IR spectra of 13 chloroazobenzenes were determ ined to facilitate their identification. Bathochromic UV m axim a pro...