A liquid chromatographic (LC) method with 2 detection systems for determining atropine (hyoscyamine) sulfate in commercial products was tested in a multilaboratory study. Depending on the type of product, sample solutions are prepared in methanol or methanol-water (1 + 1). The standard solution contains about 1.0 mg atropine sulfate/100 mL and is prepared in the same solvent used in sample prep...

Ultraviolet (UV) excitation for laser-induced native fluorescence (LINF) detection in capillary electrophoresis (CE) offers impressive performance figures of merit when assaying peptides containing tyrosine or tryptophan residues, catecholamines, indolamines, and a number of other classes of analytes with appreciable fluorescence when excited by UV radiation. One of the largest drawbacks of nat...

High-sensitivity and visible-blind ultraviolet (UV) photoconductive detectors based on SrTiO(3) single crystal with interdigitated electrodes are reported. The responsivities of photovoltage and photocurrent can reach 2.13x10(5) V/W and 213 mA/W, respectively, at 330 nm at ambient temperature, and the corresponding quantum efficiency eta reaches 80.2%. The dark current is lower than 50 pA at 10...

After hatching, larvae of coral reef fishes experience a pelagic phase during which they are diurnal planktivores. It has been suggested that ultraviolet (UV) vision is beneficial for the detection of planktonic prey. Aims were therefore to investigate whether ocular media of pre-settlement reef fish differ from those of respective adults, and whether larvae have UV-transparent ocular media req...

We report on the use of soft UV nanoimprint lithography (UV-NIL) for the development of reproducible, millimeter-sized, and sensitive substrates for SERS detection. The used geometry for plasmonic nanostructures is the cylinder. Gold nanocylinders (GNCs) showed to be very sensitive and specific sensing surfaces. Indeed, we demonstrated that less than 4 ×10(6) avidin molecules were detected and ...

A low-power laser-UV microbeam of wavelength 257 nm was used for microirradiation of a small part of the nucleus of Chinese hamster cells. Following fixation in interphflse or in the subsequent metaphase indirect immunofluorescent staining was performed with antiserum to photoproducts ofDNA treated with far UV ligh t. The results show that antibodies specific for UVirradiated DNA can be used fo...

The brain is a complex organ, consisting of blood vessels, neurons, neuronal support cells, and meninges. The extracellular space surrounding the neurons is a very complex microenvironment, containing proteins, growth factors, neurotransmitters, and other small molecules. Microdialysis has been extensively used for sampling analytes from extracellular spaces in tissues. The microdialysis membra...

the aim of this study was to develop an easy analytical method for determining flam prop-m- iso propyl residues in honey by high performance liquid chromatography with uv detection (hplc/uv) for routine analysis. chromatographic separation was carried out at room temperature on a zorbax eclipse xdb- c18, 100 å pore size, 5 μm particle size (300 mm × 3 mm i.d.) column using a mobile phase of met...

apigenin is best known as an irreversible inhibitor of monoamine oxidase (mao), an intracellular enzyme associated with the outer membrane of mitochondria. the purpose of this study is to establish a reliable and quick method for the assignment of apigenin in cosmos bipinnatus, apium graveolens and petroselinum crispum by high performance liquid chromatography with ultraviolet detection (hplc-u...

SO2 ultraviolet (UV) camera technology has been successfully applied to the accurate imaging detection of pollutant gas concentration; however, actual ability this not intensively studied, especially accuracy and limit under influence light dilution effect. Here, we theoretically experimentally investigate UV scattering on concentration inversion. The radiation transfer model effect is reconstr...