Results 151 to 160 of about 911 (180)
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Photophysical behavior of norharmane related to proximity effect
Journal of Luminescence, 1990Abstract Solvent and temperature effects of fluorescence and its polarization characteristics for norharmane were studied. From the results obtained it is concluded that the fluorescent state changes from the φφ ∗ -type in a polar solvent (EPA) to nφ ∗ -type in a nonpolar solvent (MC), and also that lowest singlet excited states (φφ ∗ -type and nφ ∗
A. Olba, F. Tomas, I. Zabala
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Cyclodextrins modify the proton transfer photoreactions of norharmane
Journal of Photochemistry and Photobiology A: Chemistry, 2005Abstract Excited state proton transfer reactions of norharmane have been investigated in the presence of cyclodextrins (CDs): β-CD and modified β-CDs at pH values of 4.0, 7.8, 10.0 and 13.0. The spectral shape and the species present in the equilibria depend on the CDs and the pH of the media.
José L. Prados +4 more
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The Role of Harmane and Norharmane in In Vitro Dopaminergic Function
Journal of Drug and Alcohol Research, 2015Background. Nicotine is one of the most frequently used drugs of abuse. It has long been speculated that in addition to nicotine, tobacco contains other compounds that reinforce addiction. Two promising candidates are the tobacco smoke constituents, harmane and norharmane. Purpose.
Susan M. Lantz +5 more
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Co-mutagenic effect of norharman with N-nitrosamine derivatives
Mutation Research, 1981The mutagenicities of 14 nitrosamine compounds were tested on Salmonella typhimurium TA98 and TA100 in the presence of the co-mutagen norharman. N-Nitrosophenyl compounds, such as N,N-diphenylnitrosamine, N-methyl-N-phenylnitrosamine, N-ethyl-N-phenylnitrosamine and N-phenyl-N-benzylnitrosamine, were mutagenic when norharman was added to the incubation
K, Wakabayashi +3 more
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Plasma harman and norharman in Parkinson's disease.
Journal of neural transmission. Supplementum, 1996Several lines of evidence suggest that endogenous and exogenous toxins may play a major role in the pathogenesis of Parkinson's disease (PD). In the brain aromatic beta-carbolines, like harman or norharman, may be formed by cyclization of indoleamines. Because of the structural similarity to MPTP, beta-carbolines have been proposed as endogenous toxins.
W, Kuhn +3 more
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Neuroactive β-Carbolines Norharman and Harman in Coffee
2015Coffee is among the highest sources of norharman and harman in the human diet. Their presence in coffee has increased the conflictive and inconclusive list of compounds with possible biological activity in this popular beverage. Because regular coffee consumption has been epidemiologically associated with a reduced risk for Parkinson disease and ...
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Norharman - is it an Exclusively Endogenous Modulator of Behavior?
Pharmacopsychiatry, 1999openaire +2 more sources