Chemiluminescence of bromine vapor under pulsed lamp pumping

2006 ◽  
Vol 101 (5) ◽  
pp. 678-682
Author(s):  
V. V. Tarasenko
Keyword(s):  
Bromine Vapor ◽  
Lamp Pumping

Direct Fluorescent Detection of Organothiophosphorus Pesticides and Some of Their Sulfur-containing Breakdown Products After Thin Layer Chromatography

1967 ◽  
Vol 50 (5) ◽  
pp. 1088-1098
Author(s):  
Mohamed Tawfik H Ragab
Keyword(s):  
Thin Layer ◽  
Ethyl Acetate ◽  
Thin Layer Chromatography ◽  
Ultraviolet Light ◽  
Congo Red ◽  
Fluorescent Detection ◽  
Bromine Vapor ◽  
Layer Chromatography ◽  
Sulfur Containing ◽  
Dark Blue

Abstract A rapid, simple, convenient, and widely applicable method for the direct fluorescent detection of organothiophosphorus pesticides and some postulated breakdown products of these compounds is presented. The coinpounds were spotted on thin layer chromatographic sheets, developed in ethyl acetate :nhexane, and made visible by exposure to bromine vapor followed by spraying with ferric chloride and 2-(o-hydroxy phenyl) benzoxazole. Of the 47 compounds tested, 32 compounds produced fluorescent blue spots vinder longwave ultraviolet light; these consisted of 25 organothiophosphorus pesticides, 5 sulfur-containing breakdown products, and phosphoric and hypophosphorous acids. A superimposed Congo red spray destroyed the fluorescence and resulted in dark blue spots against a red backgrovind. The sensitivity of this method is in the range of 0.2 to 5.0 μg, depending on the specific compound.

Ti:sapphire laser with long-pulse lamp pumping

1992 ◽  
Author(s):  
Michael P. Koselja ◽  
Jiri Kubelka ◽  
Jiri Kvapil
Keyword(s):  
Pulse Lamp ◽  
Ti:Sapphire Laser ◽  
Long Pulse ◽  
Lamp Pumping

scholarly journals A METHOD FOR INTRACELLULAR AUTORADIOGRAPHY IN THE ELECTRON MICROSCOPE

1961 ◽  
Vol 10 (4) ◽  
pp. 577-587 ◽  
Author(s):  
M. H. Silk ◽  
A. O. Hawtrey ◽  
I. M. Spence ◽  
J. H. S. Gear
Keyword(s):  
Electron Microscope ◽  
Osmium Tetroxide ◽  
Red Light ◽  
Kidney Cells ◽  
Sodium Thiosulphate ◽  
Aqueous Sodium ◽  
Fine Wire ◽  
Ultrathin Sections ◽  
Bromine Vapor ◽  
Silver Metal

A technic is described for high resolution intracellular autoradiography in the electron microscope. Cultures of LLC-MK2 monkey kidney cells were incubated for 72 hours in a medium containing 0.4 µcurie per ml of thymidine-H3. After labeling, the cells were fixed with osmium tetroxide and embedded in methacrylate. Ultrathin sections of the labeled tissue were taken up on Formvar-coated and carbon-stabilized electron microscope grids. A 150 to 450 A layer of silver metal was then evaporated onto the tissue. The coated grids were exposed to bromine vapor for 1.5 to 2 minutes under red light, allowed to dry for 1 minute, and then covered with a thin film of 1 per cent aqueous gelatin applied by means of a fine wire loop lowered over the grid supported on a glass peg. For autoradiographic exposure, the grids were stored 50 days in a light-proof container at 4°C with calcium chloride desiccant. Development was carried out for 5 minutes at 20°C in Promicrol (May and Baker, England) diluted 1:1 with water, followed by a 1 minute water wash and fixation for 2.5 minutes in 15 per cent aqueous sodium thiosulphate. After removal of the gelatin by immersion for 16 hours in water at 37°C, the autoradiograms were dried and examined in the electron microscope. Ultrastructural detail was fairly well defined and the cytoplasm of each labeled cell was covered with an electron opaque deposit of silver, suggesting that a polynucleotide containing thymidine may be synthesized in the cytoplasm. The matter is discussed.

Effect of photodecay on the generation of a dyestuff laser with lamp pumping

1973 ◽  
Vol 19 (2) ◽  
pp. 1008-1011 ◽  
Author(s):  
F. Pinter ◽  
I. Ketskemety ◽  
�. Farkash ◽  
L. Kozma
Keyword(s):  
Lamp Pumping

Coumarin‐4 laser efficiency up to 0.14% under coaxial flash‐lamp pumping

1987 ◽  
Vol 61 (3) ◽  
pp. 1217-1219
Author(s):  
Fu Geng Zhang ◽  
Chuang Lian Yu
Keyword(s):  
Flash Lamp ◽  
Laser Efficiency ◽  
Coaxial Flash Lamp ◽  
Lamp Pumping

FATTY ACIDS AND THEIR ESTERS: III. IODINE VALUES BY THE BROMINE VAPOR METHOD

1936 ◽  
Vol 14b (6) ◽  
pp. 237-242 ◽  
Author(s):  
H. N. Brocklesby ◽  
K. F. Harding
Keyword(s):  
Fatty Acids ◽  
Iodine Value ◽  
Close Agreement ◽  
Wijs Method ◽  
Iodine Values ◽  
Bromine Vapor ◽  
Value Determination ◽  
Vapor Method

A modified bromine vapor method for iodine value determination that allows of the determination of substitution is described. For non-conjugated unsaturated oils free from oxidation or polymerization products, values are obtained that are in close agreement with those found by Wijs' method. The unsaturation of conjugated esters can be determined satisfactorily. Owing to substitution, the unsaturation of oxidized or polymerized esters cannot be determined by this method.

. Reaction of Protolignin with Bromine Vapor

1958 ◽  
Vol 61 (9) ◽  
pp. 1073-1077
Author(s):  
Tokuro Nakamura ◽  
Jun-ichi Okuma ◽  
Ikuo Sasaki ◽  
Sadao Kitaura
Keyword(s):  
Bromine Vapor
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