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  • 1975-1979  (6)
  • 1950-1954  (3)
  • 1975  (6)
  • 1953  (3)
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Years
  • 1975-1979  (6)
  • 1950-1954  (3)
Year
  • 1
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 6 (1953), S. 365-366 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 31 (1975), S. 654-660 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The topotaxy of the reaction of single crystals of periclase, MgO, and β-Ga2O3 to form the spinel MgGa2O4 was investigated by optical and X-ray diffraction techniques after reaction at 1600°C. Three different reaction couples were studied, namely the (001) face of β-Ga2O3 contacting the (001), (110) and (111) surfaces of MgO. The three-dimensional coherency of the oxygen arrangement and packing between each constituent oxide and the spinel reaction product was demonstrated. In both cases the close-packed oxygen planes in the spinel product were aligned parallel to the close-packed oxygen planes in the respective reactant. The topotaxies between the spinel product and the parent crystals were: (a) (111)sp||(013)ga1, [1{\bar 1}0]sp||[100]gai; (b) (111)sp||(111)p, [1{\bar 1}0]sp||[1{\bar 1}0]p. The data for the topotaxy of the spinel reaction product with respect to β-Ga2O3 is fully consistent with an earlier study of the precipitation of β-Ga2O3 from a spinel crystalline solution. This study verified a Wagner-type reaction mechanism where the close-packed oxygen anion structure remains essentially unchanged while the reaction proceeds by a counter diffusion of Mg2+ and Ga3+ ions through the spinel layer formed at the interface. This method of solid-state crystal growth for binary oxide systems at a temperature far below the solidus temperature (∼ 2000°C) can find application in the growth of crystals that decompose or melt ineongruently or that have an undesirable polymorph when solidified directly from the melt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 953-953 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The accompanying table gives the number and length of the tracks studied. Element No. of tracks Positron Electron 1 Length of tracks (cm.) Positron Electron Nitrogen Argon 174 263187 282 1,652-9 3,183-2 2,169-2 3,257-6 Only those positrons and electrons the energy of which lies between 0-18 MeV. ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 360-361 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the present experiment, we have investigated the distribution of the angles between the direction of the emission of the oc-particles and of the conversion electrons by employing a continuously sensitive diffusion chamber operated at atmospheric pressure. Proper control of the vapour source, a ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 31 (1975), S. 537-538 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé On a mesuré l'effet de la vitamine E sur l'induction du gonflement causé par le glutathion sur les mitochondries isolées du foie de souris qui avaient été nourries de 3-Mc-DAB pendant 12 semaines. Le 3-Me-DAB n'a pas influencé le gonflement des mitochondries; l'absence de vitamine E a produit une réduction du gonflement.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 24 (1975), S. 511-516 
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It has been found that long palea, an easily identifiable trait, is attributable to two duplicate recessive genes designated lp 1 and lp 2. A new character, uneven kernel has been described, the espression of which is controlled by two dominant complementary genes, Un a and Un b. Two dominant complementary genes, Cl a and Cl b have been found controlling clustered habit. One of the complementary genes for clustered habit, Cl a was linked with one of the complementary genes for uneven kernel, Un a with a c.o. value of 22.1 per cent. This linkage has been assigned to I linkage group in indica rice. The long glume gene g showed 22.2 per cent linkage with oed rice gene, Rc. It was further found linked with one of the complementary genes for uneven kernel, Un b (17.8 per cent) and one of the duplicate recessive genes for long palea, lp 1 (30.2 per cent). The cross-over value between Ub b and lp 1 was 11.5 per cent. The gene order appeared to be lp 1-Un b-g-Rc. These linked genes have tentatively been assigned to IV linkage group in indica rice.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Induced tetraploidy restores fertility in sterile cultivars of Bougainvillea. However, like the fertile diploid cultivars induced tetraploids are self-incompatible, but set seeds readily on crossing. Diploid progenitors show irregular meiosis, while in tetraploid counterparts there is predominant bivalent pairing. Low frequency of quadrivalents at 4x level implies that pairing at diploid level is between chromosomes heterozygous for cryptic structural changes. This also accounts for lower number of chiasmata per chromosome in diploids in comparison with their tetraploid counterparts. Sterility at 2x level appears to be due to recombination of cryptic structural differences and/or unequal distribution or aberrant behaviour of univalents. Predominant bivalent pairing accompanted by high fertility is a strong pointer towards preferential pairing in induced tetraploids.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Tropical animal health and production 7 (1975), S. 45-50 
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'action molluscicide du N-tritylmorpholone (Frescon) à 0,025 ppm et du sulfate de cuivre à 10 ppm, sur les escargots aquatiques communs dans des eaux stagnantes en citernes a été étudiée. L'application de ces produits chimiques n'a pas été continue. Les effets d'un traitement unique et d'un traitement renouvelé une nouvelle fois au bout de deux semaines sont exposés. Les résultats montrent que le Frescon est supérieur au sulfate de cuivre, ce molluscicide étant plus sûr, à action plus prolongée, comme l'indique le faible taux de repeuplement par les escargots après traitement, d'absence de phytotoxicité et de toxicité pour les poissons. Des différences de sensibilité à ces deux molluscicides chez les trois espèces d'escargots présentes ont été observées.
    Abstract: Resumen Se estudiaron los efectos molucicidas del N-tritilmorfoline en concentraciones de 0·025 ppm y del sulfato de cobre en concentraciones de 10 ppm en caracoles acuáticos comunes en aguas estáticas de tánques experimentales. La aplicación de los químicos no fue contínua. Se presentaron los resultados de aplicaciones sencillas y múltiples con intervalo de dos semanas. Los resultados indican que el Frescon fue superior al sulfato de cobre, en cuanto el quimico fue más seguro con mayor efector residual, como lo indican la baja repoblación de caracoles después del tratamiento, la ausencia de fitotoxicidad y de efectos tóxicos en peces nativos. Se observó variación en la susceptibilidad de las tres especies de caracoles a los dos molucicidas utilizados.
    Notes: Summary The molluscicide effects of N-tritylmorpholine (Frescon) at 0·025 ppm and copper sulphate at 10 ppm, on common aquatic snails in static waters in tanks were studied2. The application of these chemicals was not continuous. The actions of single treatment and of treatment repeated once at an interval of 2 weeks are recorded. The results indicate that Frescon was superior to copper sulphate in that the molluscicide was safer with a more prolonged effect, as indicated by low repopulation of snails after treatment, absence of phytotoxicity and lack of toxicity to native fish. Variation in susceptibility of the three species of snails to the two molluscicides was observed.
    Type of Medium: Electronic Resource
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