Results 251 to 260 of about 209,601 (301)

Ultraviolet Absorption Spectra of Substituted Benzenes

Reviews of Modern Physics, 1942
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Ultraviolet Absorption Spectra of Polyribonucleotides

Journal of the Physical Society of Japan, 1970
The optical absorption spectra of single stranded poly A, poly U, poly G, poly C and double stranded poly A, poly C, poly (A+U), copoly (A-U), poly (G+C), copoly (G-C), RDV-RNA and CPV-RNA in the aqueous solution were measured in the wavelength range from 3100A to 2000A in order to study the electronic structures by comparing these experimental data ...
Seinosuke Onari, Kimitsuna Watanabe
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Ultraviolet Absorption Spectra of Narcotics

Applied Spectroscopy, 1956
The following ultraviolet spectra of narcotics and related compounds were prepared by Drs. C. G. Farmilo, P. M. Oestreicher and L. Levi of the Food and Drug Laboratory, Ottawa, Canada. They were published in the Narcotics Bulletin of the United Nations, 6, 56-69, September-December 1954, and due to the rather limited circulation of this journal, are ...
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Ultraviolet absorption spectra: Some substituted coumarins

Journal of Applied Chemistry and Biotechnology, 1974
AbstractThe u.v. absorption spectra of forty‐one substituted coumarins have been studied in methanol and aqueous methanol over a pH range. The effect of the nature and position of the substituent in the coumarin nucleus is discussed.
K. V. Masrani, H. S. Rama, S. L. Bafna
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Ultraviolet absorption spectra of dihydroindole alkaloids

Proceedings of the Indian Academy of Sciences - Section A, 1960
The ease of protonation of N a of dihydroindole alkaloids is shown to depend not only on the distance from N b , but also on the degree and nature of substitution in the neighbourhood of N a , from a study of their u.v. spectra in acid solution.
T. R. Govindachari, S. Rajappa
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Ultraviolet absorption spectra of some alkylchloramines

Analytica Chimica Acta, 1990
Abstract The ultraviolet spectra of six alkylchloramines are determined between 220 and 320 nm. The wavelengths of maximum absorption are 244 nm (ϵ = 458 l mol −1 cm −1 ) for monochloramine, 252 nm (ϵ = 372 l mol −1 cm −1 ) for methylchloramine, 251 nm (ϵ = 378 l mol −1 cm −1 ) for ethylchloramine, 250 nm (ϵ = 368 l mol −1 cm −1 ) for ...
Michel Ferriol, Josette Gazet, Rosette Rizk-Ouaini   +2 more
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Ultraviolet absorption spectra of vinyl sulfides

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1975
1. It was assumed that in the vinyl alkyl Sulfides the electron transition with νmax ≈ 41,000 cm−1 must be assigned to the π-π* type. 2. In the vinyl alkyl sulfides the UV absorption in the regionν > 43,000 cm−1 is probably caused by the σ-σ* transitions.
Yu. L. Frolov, L. M. Sinegovskaya, N. K. Gusarova, O. A. Zasyadko, S. V. Amosova, B. A. Trofimov   +5 more
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Vacuum ultraviolet absorption spectra of fluoromethanes

The Journal of Chemical Physics, 1973
The electronic absorption spectra of tetrafluoromethane, fluoroform, methylene fluoride, and methylfluoride were measured between 120 and 60 nm. Except for intenstities the spectra are found to be essentially the same as the electron impact spectra published previously by Harshbarger, Robin, and Lassettre.
P. Sauvageau, R. Gilbert, P. P. Berlow, C. Sandorfy   +3 more
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Ultraviolet Absorption Spectra of Mercuric Halides

The Journal of Chemical Physics, 1972
The gas phase transitions of the mercuric halides were observed in the UV region by operating at temperatures above 400 K and at vapor pressures on the order of 0.5 mm. Spectral features exhibited by the chloride, bromide, and iodide of mercury correlate energetically with bands previously designated as intermolecular charge transfer transitions.
P. Templet, J. R. McDonald, S. P. McGlynn, C. H. Kendrow, J. L. Roebber, K. Weiss   +5 more
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Ultraviolet absorption and epidermal‐transmittance spectra in foliage

Physiologia Plantarum, 1994
We examined the UV absorption spectra and the epidermal‐transmittance spectra (280–350 nm) of foliage from 42 plant species. Sun foliage was sampled from naturally growing individuals of seven species in each of six life forms comprising two evergreen groups (gymnosperms and angiosperms) and four deciduous angiosperm groups (trees, shrubs and vines ...
T. A. Day, B. W. Howells, W. J. Rice
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