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  • Chemistry  (6)
  • Cell & Developmental Biology  (4)
  • Life and Medical Sciences  (4)
  • 1975-1979  (10)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 625-633 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Derivatives of Halogenated Aldehydes. XIV. Reactions of 1,2,2,2-Tetrachloroethyl Isocyanate1,2,2,2-Tetrachloroethyl isocyanate 2 reacts with alcohols or phenols to form the N-tetrachloroethyl-O-alkyl(aryl) urethanes 3-6. With thioalcohols and thiophenols the corresponding thiourethanes 11-12 are obtained. In these compounds the chlorine in position 1 can be substituted by treatment with a nucleophilic compound in the presence of a base by way of an elimination addition mechanism. In these reactions the compounds 7-10 and 13-14 are formed. Amines attack 2 at both active centres to give the substituted ureas 15-18. Diphenyl amine, some carboxylic acid amides and benzazoles, however, react only with the isocyanate group to form the compounds 19-25. Reactions of 2-amino-benzazoles, 2-amino-pyridine and amidines with 2 yield the heterocyclic compounds 26-31.
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  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stable Mercury(I)-Selenium Compounds, 1. Synthesis and Structure of Tetrakis(diphenylseleno)dimercury(I) Diperchlorate, Synthesis of Bis(diphenylseleno)dimercury(I) DinitrateThe new compounds 1 and 2 have been prepared by the reaction of diphenyl selenide with mercury(I) nitrate or perchlorate in methanolic solution. As shown by an X-ray analysis the structure of compound 1 contains the groups [(C6H5)2Se]2Hg-Hg[Se(C6H5)2]2 and O-coordinated ClO4⊖-anions. Compound 2 contains only 2 mol of diphenyl selenide for 1 mol of Hg2(NO3)2.
    Notes: Durch Umsetzung methanolischer Lösungen von Quecksilber(I)-nitrat bzw. -perchlorat mit Lösungen von Diphenylselenid in Methanol wurden die neuen Verbindungen 1 und 2 dargestellt. Nach röntgenographischen Untersuchungen liegen in 1 die Gruppen [(C6H5)2Se]2Hg—Hg[Se(C6H5)2]2 neben über ein O-Atom koordinierten ClO4⊖-Anionen vor. Die Verbindung 2 enthält nur 2 mol Diphenylselenid auf 1 mol Hg2(NO3)2.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 86 (1975), S. 653-661 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The electrophysiological properties of guinea pig peritoneal macrophages cultured in vitro were studied using standard intracellular recording techniques. The mean transmembrane potential, input resistance and time constant recorded from these cells were - 13.1 mV, 140 Mohms, and 18 msec respectively. The majority of macrophages exhibited spontaneous hyperpolarizations (HA) of 4-8 seconds in duration and 10-50 mV in amplitude. Mouse peritoneal macrophages and human monocyte-derived macrophages manifested similar HA. HA could be induced by either mechanical stimulation or application of hyperpolarizing currents of 2-8 namps. HA had a mean reversal potential of - 53 mV. Increasing the extracellular [K+] 10-fold resulted in a 50 mV shift in reversal potential. Addition of EGTA (1.5 mM) inhibited both spontaneous and evoked macrophage HA in the presence of excess Mg++. The divalent cation ionophore, A23187 induced prolongation of HA at low concentration (0.6 × 10-6 M) and resulted in sustained hyperpolarization at higher concentration (2.0 × 10-6 M). Addition of EGTA to cells treated with A23187 abolished HA. These data indicate that: (1) cultured macrophages from a variety of species exhibit spontaneous and induced HA, (2) development of HA is related to an increase in membrane permeability to K+, and (3) Ca++ may regulate the spontaneous and evoked electrical activity of the macrophage membrane presumably by affecting K+ permeability.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 93 (1977), S. 31-39 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Monolayer cultures of fetal rat myocardial cells can be utilized to examine substrate preferences and interactions. The specific activity of glucose oxidation by myocardial cell cultures was high in sparse cultures but decreased with increased cell density. In contrast, palmitate oxidation was independent of initial cell density. Palmitate inhibited glucose oxidation by 50% in rat heart cultures. Glucose had only a slight sparing effect on palmitate oxidation. This suggests that fetal and newborn rat myocardial cells in culture preferentially oxidize palmitate similar to adult heart. The sparing effect of palmitate on glucose oxidation is accounted for by inhibition of the glycolytic-aerobic pathway and not by inhibition of the pentose phosphate pathway. Data on oxidation of 14C-pyruvate specifically labelled suggest that palmitate or a product of its oxidation such as acetyl-CoA may be acting directly to inhibit the pyruvate dehydrogenase complex. Palmitate oxidation per mg of cell protein was constant from 15 days gestational age to 2 days postnatal age. The observed differences between cultured cells and the intact heart may relate to decreased aerobic metabolism in monolayer cell culture and suggest that the increase in fatty acid oxidation observed in vivo is controlled by the oxygen environment of the cell. These studies show that heart cells in monolayer culture can be utilized to obtain metabolic information similar to an adult organ perfusion model.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 85 (1975), S. 235-242 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Studies were carried out on confluent cultures of human fibroblasts to explore the effect of insulin on basal and hormone-induced elevations of intracellular cyclic AMP content during short-term incubations in serum-free medium. Insulin tended to decrease basal levels of cyclic AMP but this was not statistically significant. Similarly, insulin was unable to block the elevations of intracellular cyclic AMP content induced by PGE1, epinephrine and glucagon. Paradoxically, when cells were preincubated with insulin, PGE1-stimulated cyclic AMP elevation was potentiated, possibly because insulin was conserving factors needed for a maximal PGE1 stimulus or retarding the leakage of cAMP itself. The results indicate that insulin has little or no direct effect on cyclic AMP metabolism in cultured human fibroblasts and is consistent with the known insensitivity of these cells to insulin for other parameters.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 95 (1978), S. 275-285 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The relationship between plasminogen activator levels and the expression of the transformed phenotype was studied in a 5-bromodeoxyuridine (BrdUrd) dependent mutant of Syrian hamster melanoma cells. In terms of cell morphology and cellular interactions, the BrdUrd dependent cells resemble transformed cells when grown in the presence of BrdUrd but resemble untransformed cells when grown in the absence of BrdUrd. It was found that the BrdUrd dependent cells release significant levels of plasminogen activator only when cultured in the absence of BrdUrd. In the presence of BrdUrd, the release of plasminogen activator by the dependent cells is suppressed, and the decreased level of plasminogen activator released in the presence of BrdUrd seems to be due to decreased production of active enzyme. Growth tests revealed that the BrdUrd dependent cells, when attached to a substrate, required BrdUrd in order to attain high densities. Furthermore, the cells are able to grow well in soft agar only in the presence of BrdUrd. These results suggest that the production and release of high levels of plasminogen activator are not related (either as cause or effect) to the expression of the transformed phenotype in the BrdUrd dependent cellsThe effect of dog serum (as a plasminogen source) on the BrdUrd dependent cells also was tested. It was found that cells cultured in medium containing dog serum exhibit a morphological alteration, but only in the absence of BrdUrd. The morphological response of the cells to dog serum resembles that previously observed with virus-transformed cells. In the BrdUrd dependent cells, the morphological response to dog serum appears correlated with the release of plasminogen activator but separated from other transformed characteristics.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 1-19 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of several naturally occuring Sceletium alkaloids, as well as several synthetic variants, have been investigated. Techniques used include high resolution mass measurements, analysis of metastable transitions by the technique of ion defocusing and specific deuterium labeling in conjunction with low resolution mass spectrometry. Characteristic major fragmentation pathways have been determined for four basic structure types studied: the cis-3a-aryl-octahydroindole ring system, exemplified by mesembrine; its 2,3-pyrido analog, Sceletium A4; the seco series of pyridine bases, represented by tortuosamine; and the seco analog of the mesembrine-type represented by tortuosamine; and the seco analog of the mesembrine-type represented by dehydrojoubertiamine.
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 333-336 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of cations based on substituted pyrrolidines and piperidines has been investigated by NMR in low dielectric solvents. Non-equivalent cation methylene protons are selectively shifted by paramagnetic anions; the size of the shift depends directly on the ability of the anion to approach closely the group in question. The assignments resulting from the shift data have been compared with the work of other authors.
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  • 9
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method for the identification of Δ9-tetrahydrocannabinol by gas chromatography mass spectrometry has been developed, and this method has been compared with other techniques, such as detection via thin-layer chromatography using tritium labeled Δ9-tetrahydrocannibinol and a dual gas chromatographic method. The gas chromatographic mass spectrometric method was found to be equal or superior to other techniques and has the added advantage of being highly specific for the compound analyzed. An alternate approach using chemical ionization is also described; however, this procedure does not show significant advantages over the electron impact method. These methods show a practical lower detection limit of 500 pg ml-1 of plasma in clinical practice.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 458 (1979), S. 69-73 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ligand Field Spectrum of Chromium(III)tris(dimethylphosphonium-bismethylide)The spectrum of the chromium(III)tris(dimethylphosphonium-bismethylide), [Cr{(CH2)2P(CH3)2}3], in heptane has been recorded under strictly anaerobic conditions, and the ligand field parameters derived from it, have been compared with the parameters of analogous complexes. The Δ value is nearly the same as with the [Cr(CH3)6]3--ion, and the comparatively smaller Racah parameter B probably can be attributed to a trigonal distortion from the ligand.
    Notes: Das Spektrum des Chrom(III)-tris(dimethylphosphonium-bismethylids), [Cr{(CH2)2P(CH3)2}3], in Heptan wurde unter anaeroben Bedingungen aufgenommen und die hieraus abgeleiteten Ligandenfeldparameter mit denen analoger Komplexe verglichen. Der Δ-Wert gleicht weitgehend dem des [Cr(CH3)6]3--Ions, der der vergleichsweise kleinere Racah-Parameter B ist dagegen vermutlich auf eine durch die Ligandenstruktur bedingte trigonale Störung des Ligandenfeldes zurückzuführen.
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