نتایج جستجو برای: absorbance spectra

تعداد نتایج: 116379  

Journal: :Environmental science. Processes & impacts 2014
Charles M Sharpless Neil V Blough

Absorption of sunlight by chromophoric dissolved natural organic matter (CDOM) is environmentally significant because it controls photic zone depth and causes photochemistry that affects elemental cycling and contaminant fate. Both the optics (absorbance and fluorescence) and photochemistry of CDOM display unusual properties that cannot easily be ascribed to a superposition of individual chromo...

Journal: :Clinical chemistry 2001
H J Duiser F W Roelandse E G Lentjes J van Loon J H Souverijn A Sturk

References 1. Bianchi DW, Flint AF, Pizzimenti MF, Knoll JH, Latt SA. Isolation of fetal DNA from nucleated erythrocytes in maternal blood. Proc Natl Acad Sci U S A 1990;87:3279–83. 2. Lo YMD, Corbetta N, Chamberlain PF, Rai V, Sargent IL, Redman CWG, Wainscoat JS. Presence of fetal DNA in maternal plasma and serum. Lancet 1997;350:485–7. 3. Lo YMD, Tein MSC, Lau TK, Haines CJ, Leung TN, Poon P...

Journal: :Cell calcium 1992
R S Zucker

The fluorescence properties of the calcium indicators Fura-2 and Fluo-3 have been investigated in the presence of the 'caged calcium' photolabile chelators Nitr-5 and DM-nitrophen. The excitation spectra of dilute solutions of these indicators was distorted by the presence of photolabile chelators, owing to differential absorbance of excitation light by the chelators, as well as calcium-depende...

Journal: :Zeitschrift fur Naturforschung. Section C, Biosciences 1974
W Lohmann

The ultraviolet absorption spectra of uracil and its 5-halogenated derivatives have been in­ vestigated in regard to the electron attracting properties of the substituents. It could be shown that the position of the two absorption bands is proportional to the inverse of the electronegativity; the extinction coefficients are a linear function of the electron affinities. In this way, the red shif...

2014
Yu Zhao Hui Li Xu-Jun Liu Lei-Lei Guan Yan-Li Li Jian Sun Zhi-Feng Ying Jia-Da Wu Ning Xu

UNLABELLED Evenly separated crystalline CuIn0.8Ga0.2Se2 (CIGS) nanoparticles are deposited on ITO-glass substrate by pulsed laser deposition. Such CIGS layers are introduced between conjugated polymer layers and ITO-glass substrates for enhancing light absorbance of polymer solar cells. The P3HT:PCBM absorbance between 300 and 650 nm is enhanced obviously due to the introduction of CIGS nanopar...

Journal: :Chemical Society reviews 2013
Kiryl D Piatkevich Fedor V Subach Vladislav V Verkhusha

Near-infrared light is favourable for imaging in mammalian tissues due to low absorbance of hemoglobin, melanin, and water. Therefore, fluorescent proteins, biosensors and optogenetic constructs for optimal imaging, optical readout and light manipulation in mammals should have fluorescence and action spectra within the near-infrared window. Interestingly, natural Bacterial Phytochrome Photorece...

2012
Martine Bertrand Barbara Bereza Esther Dujardin

N A D P H , N A D P + Photoreduction, Etioplasts, Absorbance Difference Spectra, Phaseolus vulgaris It has been investigated if photoreduction of N A D P + (detected by absorption spectroscopy) may take place in lysed plastids within minutes of exposure to light. This process was made possible by removal of oxidants from the reaction mixture. Lysed plastids were suspended in a medium containing...

Journal: :Metal-Based Drugs 1998
Udai P. Singh Sudha Singh Sukh Mahendra Singh

Metal complexes of 5-carboxy-2-thiouracil with Mn(ll), Co(ll), Ni(ll), Cu(ll), Zn(ll) and Cd(ll) ions were synthesized, characterized, and subjected to a screening system for evaluation of antitumour activity against Sarcoma-180 (S-180) tumour cells. The complexes were characterized by elemental analysis, infrared, electronic spectra, room temperature magnetic measurements and powder X-ray diff...

Journal: :Journal of Chemical Education 1995

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