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  • Analytical Chemistry and Spectroscopy  (6)
  • Ethanol  (3)
  • Lycopersicon esculentum  (3)
  • 1
    ISSN: 0168-9452
    Keywords: Lycopersicon esculentum ; Phytophthora capsici ; chlorophylls ; fatty acids ; photosynthesis ; plant-pathogen interaction
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 31 (1992), S. 1961-1967 
    ISSN: 0031-9422
    Keywords: Lycopersicon esculentum ; Phytophthora capsici ; Solanaceae ; fatty acids ; glycoglycerolipids ; oomycete ; phospholipids ; plant-pathogen interactions ; polar lipids.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Phytochemistry 14 (1975), S. 2357-2362 
    ISSN: 0031-9422
    Keywords: Lycopersicon esculentum ; Solanaceae ; carotenoids ; chlorophylls. ; maturation ; plastids ; tomato fruit
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 68 (1980), S. 277-281 
    ISSN: 1432-2072
    Keywords: Drug discrimination ; Ethanol ; Apomorphine ; Salsolinol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of the present study was to investigate the possible generalization to 3-carboxysalsolinol (3C-SAL) in a group of rats trained to discriminate a low dose of ethanol (200 mg/kg IP) from the nondrug condition and in another group trained to discriminate 0.16 mg/kg IP apomorphine (AP) from the nondrug condition using a drug discrimination paradigm. In test sessions, ED50 for ethanol was 52.0 mg/kg and ED50 for AP was 0.01 mg/kg. In the ethanol-trained rats, 1.8 mg/kg 3C-SAL produced drug responses. In the AP-trained rats, 200 mg/kg ethanol produced drug responses whereas 1.8 mg/kg 3C-SAL produced only a partial drug response. The results are in harmony with the hypothesis that salsolinol in the central nervous system of the rat may be responsible for the discriminability of ethanol. The possible involvement of dopaminergic systems is discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 61 (1979), S. 105-106 
    ISSN: 1432-2072
    Keywords: Ethanol ; External stimuli ; Drug-induced stimulus control ; Discrimination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats learned a two-choice operant response by discriminating differences between external stimuli, internal (drug-produced) stimuli, or a combination of these two types of stimuli. Separate groups of rats were used for each stimulus condition. A tactile and visual external cue was superior to the ethanol-saline cue in producing stimulus control, but the group receiving both drug and external stimulus cues performed in a manner very similar to the external cue-only group. The two stimulus sources thus did not “add” to promote more rapid or complete discrimination. After acquisition of discrimination, previously coincident drug and external stimulus states were reversed to determine which stimulus source had more behavioral control. This test for stimulus selectivity indicated that the external stimulus had essentially complete control of response choice.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2072
    Keywords: Ethanol ; Conditioned place preference ; Locomotor activity ; HAS/LAS ; Rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats selectively bred for high alcohol sleep times (HAS) and those that are less affected (LAS) by hypnotic doses (3.0–3.6 g/kg) of ethanol were tested for differential responses to the aversive effects of 1.0 g/kg ethanol in a conditioned place preference task. Likewise, the effects of 0.3–1.0 g/kg ethanol on spontaneous locomotor activity over a 30-min period, as well as the loss of righting reflex with a higher ethanol dose (3.0 g/kg), were determined in these animals. The LAS rats reacted more aversively to 1.0 g/kg during conditioned place aversion testing than the HAS animals and also had a shorter mean sleeping time following 3.0 g/kg ethanol. Furthermore, dose-related depression of spontaneous motor activity was seen in the HAS animals and not in the LAS animals over a 30-min period using doses of 0.3, 0.6, or 1.0 g/kg (10% w/v) ethanol. Taken together, the results indicate that the intoxicating sequelae of high ethanol doses, such as ataxia and sedation, may not be correlated with the aversive effects of low ethanol doses.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 809-814 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The aim of this article was to study the influence of different matrix molecules on the quality of matrix-assisted laser desorption/ionization mass spectra of oligosaccharides. An important criterion was the sample preparation, i.e. the crystallization process leading to the matrix from which the analytes were desorbed and investigated. Quality criteria were, among others, the resulting molecular peak intensity, the mass resolution, and the suppression of unwanted matrix peaks. It was found that a mixture of 2,5-dihydroxy benzoic acid (DHB) and 1-hydroxy isoquinoline (HIC) in a weight ratio of 3:1 was best suited for the analytical investigation of oligosaccharides. In addition, this matrix mixture was found to be quite tolerant against all kinds of buffers, salts, and even additives such as sodium dodecyl sulfate (SDS). Furthermore, we determined the different affinities of the alkaline metals to the carbohydrates and found that cesium and potassium ions ionize oligosaccharides about three times better than sodium ions and therefore have an important influence on the quantum yield.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A Nafion membrane was tested as a new tool for a fast and easy sample pretreatment for matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) measurements. This membrane material was used for ion exchange and carbohydrate purification with minimal quantities of sample solution. An ion exchange method for carbohydrates was developed and demonstrated on a Dextran sample. The cations of the original sample were replaced within minutes by potassium or cesium ions. Another feature of this membrane was the fact that proteins and peptides adsorb on the acid surface. This behavior was investigated as a purification step for carbohydrates with high peptide and protein impurity concentrations. It was found that oligosaccharide libraries from rat- and mouse IgG mass spectra can be obtained clearly in the presence of high peptide impurities.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The chemical shifts of aromatic nitriles of the general structure para-Y—C6H4—X—CN with X = O, S, Se and N(CH3) have been investigated by the 13C NMR technique. For cyanates (X = O) the 14N shifts and for Y = F the 19F shifts were likewise measured. The chemical shifts and the corresponding 13C shift increments Δn have been found to correlate with the appropriate substituent constants σR0, σp0 and σI, as well as with the π-electron densities calculated in the PPP approximation.
    Notes: An aromatischen Nitrilverbindungen der allgemeinen Struktur para-Y—C6H4—X—CN mit X = O, S, Se und N(CH3) wurden die 13C-NMR- sowie für X = O die 14N-NMR-und für Y = F die 19F-NMR-chemischen Verschiebungen bestimmt. Die Meßergebnisse wurden in Zusammenhang mit der elektronischen Struktur der Moleküle (Substituentenkonstanten, π-Elektronendichten in PPP-Näherung) diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 95-97 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbon-13 chemical shifts of several benzimidazole- and benzoxazole derivatives have been measured. The signals of the homonuclear carbon atoms in unsymmetrical benzoheteroazoles can be assigned with the aid of additivity parameters. The structures of compounds obtained from the reaction of benzimidazoline- and benzoxazoline-2-thione with aryl cyanates were elucidated.
    Notes: Für verschiedene Benzimidazol- und Benzoxazolderivate wurden die chemischen Verschiebungen im 13C-NMR-Spektrum bestimmt. Mit Hilfe von Additivitätsparametern lassen sich die 13C-Signale der Benzokohlenstoffatome in unsymmetrischen Benzheteroazolen bestimmen. Die Struktur der Reaktionsprodukte aus Benzimidazolin- und Benzoxazolin-thion-(2) und Arylcyanaten werden abgeleitet.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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