Laboratory and Greenhouse Evaluation of Ultraviolet Light Absorption Methods of Estimating Nitrogen Supplying Capacity of Calcareous Soils

2004 ◽  
Vol 35 (1-2) ◽  
pp. 219-232 ◽  
Author(s):  
J. Yasrebi ◽  
N. Karimian ◽  
M. Maftoun ◽  
A. Abtahi ◽  
A. Ronaghi ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Light Absorption ◽  
Calcareous Soils ◽  
Greenhouse Evaluation

THE STUDY OF HYDROGEN BONDING AND RELATED PHENOMENA BY ULTRAVIOLET LIGHT ABSORPTION: PART IV. INTERMOLECULAR HYDROGEN BONDING IN ANILINES AND PHENOLS

1960 ◽  
Vol 38 (6) ◽  
pp. 896-910 ◽  
Author(s):  
J. C. Dearden ◽  
W. F. Forbes
Keyword(s):  
Hydrogen Bonding ◽  
Ultraviolet Light ◽  
Light Absorption ◽  
Intermolecular Hydrogen Bonding ◽  
Solvent Molecules

Intermolecular hydrogen bonding in anilines and phenols can be subdivided into bonding involving solute molecules only, and into bonding involving both solute and solvent molecules. Interactions which do not involve hydrogen bonding are also possible between solute and solvent molecules. Spectral effects which may be associated with each of these interactions are described and discussed for anilines and phenols. By noting the effects of substituents on the various interactions, tentative conclusions can be deduced concerning the nature of these interactions.

A Comparison of Reduced-NAD Preparations from Four Commercial Sources

1968 ◽  
Vol 14 (8) ◽  
pp. 754-763 ◽  
Author(s):  
R B McComb ◽  
Royal J Gay
Keyword(s):  
Ultraviolet Light ◽  
Light Absorption ◽  
Phosphorus Content ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Ldh Isoenzymes ◽  
Activity Measurements ◽  
Commercial Sources ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The physical and chemical properties of several commercial sources of reduced NAD were examined. Properties compared included physical appearance, sodium and phosphorus content, ultraviolet light absorption at 260 and 340 nm, and relative rates of oxidation with two human LDH isoenzymes. Major differences between individual preparations were noted with respect to physical and chemical properties, as well as in the activity measurements. The commercial reduced-NAD preparations most rapidly oxidized by LDH were white, free-flowing substances with 260 nm:340 nm absorbance (A260:A340) ratios below 2.45. Detectable amounts of an LDH inhibitor were found in all preparations examined. A strong LDH inhibitor, which had the same properties as the inhibitor present in commercial reduced NAD, was isolated by column chromatography. This LDH inhibitor was found to produce the same degree of inhibition toward four LDH isoenzymes.

Real Time Oil Concentration Measurement in Automotive Air Conditioning by Ultraviolet Light Absorption

1991 ◽  
Author(s):  
Kiyoharu Kutsuna ◽  
Yoshimitsu Inoue ◽  
Takehito Mizutani ◽  
Eiichi Sudo ◽  
Toshimi Araga
Keyword(s):  
Real Time ◽  
Ultraviolet Light ◽  
Light Absorption ◽  
Air Conditioning ◽  
Concentration Measurement ◽  
Automotive Air Conditioning ◽  
Oil Concentration

The Ultraviolet Light Absorption of Ethyl Alcohol Purified by Different Methods

1931 ◽  
Vol 53 (8) ◽  
pp. 3017-3019 ◽  
Author(s):  
Philip A. Leighton ◽  
R. W. Crary ◽  
L. T. Schipp
Keyword(s):  
Ultraviolet Light ◽  
Ethyl Alcohol ◽  
Light Absorption
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