نتایج جستجو برای: ultraviolet detection
تعداد نتایج: 603871 فیلتر نتایج به سال:
Analytical methods to check the purity of active pharmaceuticals have been described in pharmacopeias. HPLC-UV detection is the most common analytical liquid chromatography technique for impurity profiling in QC laboratories because of its ease-of-use, robustness, and reliability. However, there are many occasions where ultraviolet (UV) detection has limitations, including cases where analytes ...
Immunochromatographic assays are widely used to detect many analytes. CagA is proved to be associated closely with initiation of gastric carcinoma. Here, we reported that a charge-coupled device (CCD)-based test strip reader combined with CdS quantum dot-labeled lateral flow strips for quantitative detection of CagA was developed, which used 365-nm ultraviolet LED as the excitation light source...
We describe an improved reversed-phase liquid-chromatographic method for concurrent measurement of tryptophan and eight of its metabolites in serum. These were separated by gradient elution and detected both by ultraviolet absorption at 254 nm and amperometrically at an oxidation potential of +0.700 V vs Ag/Cl. Detection limits for the electrochemically-detected compounds were between 100 pg an...
The auroras on Jupiter and Saturn can be studied with a high sensitivity and resolution by the Hubble Space Telescope (HST) ultraviolet (UV) and far-ultraviolet (FUV) Space Telescope imaging spectrograph (STIS) and Advanced Camera for Surveys (ACS) instruments. We present results of automatic detection and segmentation of Jupiter’s auroral emissions as observed by HST ACS instrument with VOrono...
We report the detection of intense emission from magnesium and iron in Mars’ atmosphere caused by a meteor shower following Comet Siding Spring’s close encounter with Mars. The observations weremade with the Imaging Ultraviolet Spectrograph, a remote sensing instrument on the Mars Atmosphere and Volatile EvolutioN spacecraft orbiting Mars. Ionized magnesium caused the brightest emission from th...
در این پروژه هدف طراحی و ساخت fluorescence detection systemجهت آشکارسازی مولکول های dna می باشد. در روش pcr، طی چندین چرخه دمایی، مولکول های dna کپی می شوند و سپس با استفاده از روش fluorescence detection، مولکول های بر انگیخته شده dna آشکارسازی می شوند. پس از آشکارسازی می توان به کپی و یا عدم کپی dnaها پی برد.می توان برای جداسازی مولکول های dna بر اساس طولشان، از روش gel electrophoresis استفاده...
We present a small data base of homogeneously derived photospheric element abundances of DZ white dwarfs and related objects. Our previous investigations are supplemented with the analysis of ultraviolet spectra for nine white dwarfs. Of particular interest is the detection of Lα absorption in van Maanen 2 and a determination of the effective temperature of this star. The new value is about 100...
Human urine, blood serum, cerebrospinal fluid, and amniotic fluid have been analyzed by high-resolution chromatographic systems under development at the Oak Ridge National Laboratory. These systems, or analyzers, consist of heated, high-pressure anion.exchange columns for chromatographic separation of the constituents and continuous-flow ultraviolet spectrophotometry or phenol-sulfuric acid col...
Development of wide-bandgap III-nitride semiconductors has been a subject of intense focus since the 1990s, primarily driven by the quest for blue lasers and high-brightness light-emitting diodes (LEDs). In parallel, III-nitrides have been studied extensively for use in ultraviolet (UV) photodetectors because they offer intrinsic visibleor solar-blind detection, which would eliminate the need f...
MassTag polymerase chain reaction (PCR) is a platform that enables microbe detection using primers labeled through a photocleavable link with tags that vary in molecular weight. After multiplex PCR, tags are released by ultraviolet irradiation and analyzed by mass spectroscopy. The identification of a microbe in a sample is determined by its cognate tags. Here we describe establishment and impl...
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