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  • Inorganic Chemistry  (292)
  • Life and Medical Sciences
  • 1970-1974  (269)
  • 1950-1954  (45)
  • 1930-1934  (80)
  • 1920-1924  (48)
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  • 1
    Electronic Resource
    Electronic Resource
    Competitive in vivo proliferation of foetal and adult haematopoietic cells in lethally irradiated mice (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 79 (1972), S. 293-298 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The relative proliferative capacity of haematopoietic cell populations derived from 22-week-old adult bone marrow and 14-18 day foetal liver has been studied in lethally irradiated syngeneic recipients by means of chromosome markers. Although starting at a disadvantage in terms of the number of colony-forming units (stem cells) injected, the foetal liver-derived populations steadily increased their relative numbers in the myeloid and lymphoid tissues over a period of several weeks until a plateau was reached. It is suggested that stem cells in foetal liver have, on average, a higher intrinsic capacity for self-renewal than do those in bone marrow, and that this capacity falls to the adult level within about ten weeks of transfer.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040790214
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  • 2
    Electronic Resource
    Electronic Resource
    Lymphopoiesis in the rat. II. The effect of thymectomySupported by grant IC-18A from the American Cancer Society, grant AI-08642 from the National Institute of Allergy and Infectious Disease and grant 211-12-E(13) from the National Tuberculosis and Respiratory Disease Association, Inc. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 80 (1972), S. 13-21 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Lymphopoiesis with respect to recirculating and non-recirculating small lymphocytes was measured simultaneously in rats thymectomized as adults. Removal of the thymus at four to five weeks of age had a profound inhibitory effect upon the production of recirculating cells, whereas the formation of non-recirculating lymphocytes was only slightly depressed. Thymectomy had approximately the same impact of lymphopoiesis as thymectomy and exposure of the animal to a large dose of whole body X- and γ-irradiation. The latter finding, and the failure of a thoracic duct cell transfusion to augment lymphocyte production, accord with the view that the thymus is the principle intermediate source of recirculating small lymphocytes in the normal, unstimulated animal.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040800103
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  • 3
    Electronic Resource
    Electronic Resource
    Lymphopoiesis in the rat. I. The effect of pool size on lymphocyte productionSupported by grant IC-18A from the American Cancer Society, grant AI-08642 from the National Institute of Allergy and Infectious Disease and grant 211-12-E(13) from the National Tuberculosis and Respiratory Disease Association, Inc. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 80 (1972), S. 1-12 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A method is described for measuring lymphopoiesis that enables the production of recirculating and non-recirculating small lymphocytes to be estimated simultaneously. Using this technique, experiments were undertaken to determine whether the production of recirculating cells is influenced by the number present in the recirculating lymphocyte pool. The results suggest that neither a massive lymphocyte transfusion nor depletion of the pool by whole body irradiation or chronic lymph drainage affect the rate at which recirculating small lymphocytes are generated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040800102
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  • 4
    Electronic Resource
    Electronic Resource
    Calcium-mediated effects of calcitonin on cyclic AMP formation and lymphoblast proliferation in thymocyte populations exposed to prostaglandin E1Issued as NRCC 12843. (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 80 (1972), S. 315-328 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The calcitonin (SCT) from salmon ultimobranchial bodies which (like mammalian calcitonins) lowers the plasma calcium concentration in mammals can also affect cyclic AMP (cyclic adenosine 3′,5′-monophosphate) metabolism and proliferation of lymphoblasts in normal and prostaglandin E1 (PGE1)-treated rat thymocyte populations in three different ways. In the first case, low concentrations (0.5-5.0 ng per milliliter) of SCT lower (by a calcium-mediated process) the ability of PGE1 to transiently increase cyclic AMP synthesis, but the reduced surge of cyclic AMP production is still ample to stimulate lymphoblasts in the cell population to initiate deoxyribonucleic acid (DNA) synthesis. Secondly, these low SCT concentrations affect the eventual progression of the PGE1-stimulated, DNA-synthesizing lymphoblasts into mitosis by a calcium-mediated process. Depending on the extracellular calcium concentration and the magnitude of the initial increment in the intracellular cyclic AMP content, SCT can either promote or inhibit the progression of the stimulated cells into mitosis. SCT's third action is a rapid (within 5 minutes), calcium-independent elevation of the cellular cyclic AMP content in otherwise untreated thymic lymphocyte populations exposed to a very high concentration (100 ng per milliliter) of the hormone. This early, transient rise in the cyclic AMP level is followed by a calcium-dependent increase in lymphoblast proliferation. An attempt is made to interrelate and explain the different actions of SCT on cyclic AMP metabolism and mitogenesis.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040800302
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  • 5
    Electronic Resource
    Electronic Resource
    RNA metabolism in thoracic duct lymphocytes from thymectomized ratsSupported by grant IC-18A from the American Cancer Society, grant AI-08642 from the National Institute of Allergy and Infectious Diseases. (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 78 (1971), S. 465-467 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040780316
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  • 6
    Electronic Resource
    Electronic Resource
    Fluoreszenz und Fluoreszenz-Thermochromie bei Alkyl-pyridinokupfer(I)-Halogeniden (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 387 (1972), S. 61-71 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: By adding acetyl halide to solutions of copper(I)acetate in mixtures of acetonitrile and acetic acid, highly pure copper(I) halides can be prepared. These form with pyridine and alkylpyridines (= L) yellow or greenish yellow compounds of the formula Cu(L)3X. Colourless compounds of the formula Cu(L)X can be obtained by thermal decomposition of these compounds. All these compounds exhibit an intensive fluorescence of different colours. Some compounds of the formula Cu(L)X change at low temperatures reversibly the fluorescence colour. It is proposed, to use for this phenomenon the term ‘Fluorescence Thermochromism’.
    Notes: Durch Zugabe von Acetylhalogenid zu Lösungen von Kupfer(I)-acetat in Acetonitril/Essigsäuregemischen sind reinste Kupfer(I)-Halogenide darstellbar. Diese bilden mit Pyridin und Alkylpyridinen (= L) gelbe bis grüngelbe Verbindungen der Zusammensetzung Cu(L)3X. Durch thermische Zersetzung können daraus farblose Verbindungen der Zusammensetzung Cu(L)X dargestellt werden. Alle diese Verbindungen zeigen eine intensive Fluoreszenz der verschiedensten Farben. Einige Verbindungen der Zusammensetzung Cu(L)X ändern bei tiefer Temperatur reversibel ihre Fluoreszenzfarbe. Für diese Erscheinung wird der Begriff ‘Fluoreszenz-Thermochromie’ vorgeschlagen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723870108
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Existenz von Manganacetat-Dihydrat (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 409 (1974), S. 345-352 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Existance of Mn (OCOCH3)2 · 2H2OThe existence of manganous acetate dihydrate is predicted and the conditions for its equilibrium existence are proved.The polyterms of solubility of the systems Mn(OCOCH3)2-H2O and Mn(OCOCH3)2- CH3COOH-H2O are studied at 40 and 60°C. The fields of equilibrium existence are determined for the acid manganous acetates of the composition 2 Mn(OCOCH3)2 · CH3COOH · 6H2O and Mn(OCOCH3)2 · CH3COOH · 1.5 H2O at 40°C as well as the fields of the acid salt of the composition Mn((OCOCH3)2 · CH3COOH · H2O a t 60°C. The crystallisation fields of Mn(OCOCH3)2 · 2H2O and Mn(OCOCH3)2 are determined a t 60°C. The results obtained are confirmed by X-ray investigation. The compositions of the solid phases are also determined from thermogravimetric studies.
    Notes: Die Existenz von Mn(OCOCH3)2 · 2 H2O wird vorausgesagt und die Bedingungen für seine Existenz im Gleichgewicht werden bestimmt.Untersucht werden die Löslichkeitsisothermen des Zweistoffsystems Mn(OCOCH3)2-H2O und des Dreistoffsystems Mn(OCOCH3)2-CH3COOH-H2O bei 40 und 60°C. Dabei werden Kristallisationsfelder saurer Acetate folgender Zusammensetzung festgestellt : 2 Mn(OCOCH3)2 · CH3COOH · 6H2O und Mn(OCOCH3)2 · CH3COOH · 1,5 H2O bei 40°C, sowie Mn(OCOCH3)2 · CH3COOH · H2O bei 60°C; bei 60°C ferner Kristallisationsfelder von Mn(OCOCH3)2 · 2H2O und Mn(OCOCH3)2. Diese Ergebnisse wurden auch röntgenographisch und thermogravimetrisch bestätigt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744090311
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  • 8
    Electronic Resource
    Electronic Resource
    Über Kupfer(I)-carboxylate und Chlorocuprate(I) (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 263-271 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In mixtures of 7 vol. acetonitrile and 3 vol. acetic acid, solutions or suspensions of copper(II) acetate can be reduced with hydrazine hydrate to solutions of copper(I) acetate. In this way, purely white copper(I) acetate can be isolated.Other copper(I) carboxylates can be prepared by reduction of copper(II) carboxylates or by reaction of solid carboxylic acids with copper(I) acetate.By adding acetyl chloride to solutions of copper(I) acetate in acetonitrile/acetic acid mixtures, solutions of chlorocuprates(I) are formed. From these, highly pure copper(I) chloride can be obtained.By adding alkali acetate or tetramethyl ammonium chloride to solutions of chlorocuprates(I), the pure compounds Cs3[Cu2Cl5], Rb2[CuCl3] and NMe4[Cu2Cl3] were obtained.
    Notes: In Mischungen von 7 Vol. Acetonitril und 3 Vol. Essigsäure lassen sich Lösungen oder Suspensionen von Kupfer(II)-acetat mit Hydrazinhydrat zu Kupfer(I)-acetat-Lösungen reduzieren. Daraus kann rein weißes Kupfer(I)-acetat isoliert werden. Weitere Kupfer(I)-carboxylate können analog durch Reduktion der Kupfer(II)-carboxylate oder durch doppelte Umsetzung einer festen Carbonsäure mit Kupfer(I)-acetat dargestellt werden. Bei Zugabe von Acetylchlorid zu Lösungen von Kupfer(I)-acetat in Acetonitril/Essigsäure-Mischungen entstehen Lösungen von Chlorocupraten(I). Daraus kann reinstes Kupfer(I)-chlorid gewonnen werden.Bei Zugabe von Alkaliacetat bzw. Tetramethylammoniumchlorid zu Chlorocuprat(I)-Lösungen werden Chlorocuprate(I) der Zusammensetzung Cs3[Cu2Cl5, Rb2[CuCl3] und NMe4[Cu2Cl3] in reiner Form erhalten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713830306
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Chemie in Schmelzlösungen. VI. Präparative Darstellung von Übergangsmetall-Manganaten in Salzschmelzen (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 288-296 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition metal manganates with spinel structure are prepared by joint decomposition of MnSO4 and MeSO4 (Me = Co, Zn, Cu, Ni) about 1000°C in the fused sodium potassium sulfate eutectic. Complete series of mixed oxides MexMn3-xO4+γ have been observed within the limits: Co: 0 〈 x 〈 3; Zn: 0 〈 x 〈 1,5; Cu: 0 〈 x 〈 1; Ni: 0 〈 x 〈 1. The compounds Co2.2Mn0.8O4 to Co1.9Mn1.1O4, ZnMn2O4, Zn1.25Mn1.75O4 may be prepared in high yield and as single-phase compounds. The oxygen deficit of the manganates has the limits 0,02 〉 γ 〉 -0.08. The lattice constants of the spinels are compared with literature dates.
    Notes: Durch gemeinsame Zersetzung von MnSO4 und MeSO4 (Me = Co, Zn, Cu, Ni) in der eutektischen K—Na-Sulfat-Schmelze bei Temperaturen um 1000°C sind grobkristalline Übergangsmetall-Manganate darstellbar. Dabei wurden lückenlose Reihen im Spinellgitter kristallisierender Mischoxide MexMn3-xO4+γ in folgenden Grenzen erhalten: Co: 0 〈 x 〈 3; Zn: 0 〈 x 〈 1,5; Cu: 0 〈 x 〈 1; Ni: 0 〈 x 〈 1. Folgende Verbindungen lassen sich mit definierter Zusammensetzung in guter Ausbeute darstellen: Co2,2Mn0,8O4 bis Co1,9Mn1,1O4, ZnMn2O4 und Zn1,25Mn1,75O4. Das Sauerstoffdefizit der Manganate lag zwischen 0,02 〉 γ 〉 -0,08. Die Gitterkonstanten der Spinelle werden mit Literaturangaben verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713860307
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  • 10
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Schwefels. 113. Der Einfluß von Verunreinigungen auf die elektrische Leitfähigkeit des flüssigen Schwefels (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 77-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Sulphur. 113. The Effect of Impurities on the Electrical Conductivity of Molten SulphurThe electrical conductivity of molten sulfur in the range up to 200°C was analysed on samples which were specially purified as well as doped with paraffin, phenanthrene, benzidine, benzil, bromine, and iodine.The current flow below 160°C results from electrophoretically migrating impurities and by interaction with the impurities ionized molecules, whereas at higher temperatures conduction is caused by electrons. At the minimum of viscosity of the molten sulfur (154,5°C) the conductivity shows a maximum, which is shifted by impurities especially halogens up to 10°C towards lower temperatures. The relation between the electrophoretic conduction in the sulfur melt and the viscosity, which determines the mobility of the charged particles, is discussed.
    Notes: Die elektrische Leitfähigkeit des flüssigen Schwefels im Temperaturbereich bis 200°C wurde an nach verschiedenen Verfahren gereinigten und an mit Paraffin, Phenanthren, Benzidin, Benzil, Methandithiol sowie Brom und Jod dotierten Proben untersucht. Während bei höheren Temperaturen Elektronenleitung vorliegt, erfolgt der Ladungstransport unterhalb von 160°C, und zwar auch bei den reinsten heute darstellbaren Schwefelproben, durch elektrophoretisch wandernde Verunreinigungsteilchen bzw. In Wechselwirkung mit den Verunreinigungen ionisierte Schwefelmolekeln. Im Bereich des Viskositätsminimums der Schwefelschmelze (154,5°C) besitzt die Leitfähigkeit ein Maximum, das jedoch durch Beimengungen, insbesondere von Halogenen, auf bis zu 10°C niedrigere Temperaturen verschoben wird. Der Zusammenhang zwischen der elektrophoretischen Leitung im Schwefel und der die Beweglichkeit der geladenen Teilchen bestimmenden Zähigkeit der Schmelze wird diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733990111
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