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  • 1980-1984  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 237-238 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The females ofDrosophila bipectinata andD. malerkotliana are able to discriminate between their own and alien males in the absence of antennae. Thus mate recognition seems to depend on contact chemoreceptors in these 2 species.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 318-318 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In order to elucidate the phylogenetic relationships betweenD. takahashii andD. pseudotakahashii, 2 closely related allopatric species, sexual isolation was studied by the male-choice method. The present data indicate that there is a one-sided mating preference between these species. On a basis of the results, their evolutionary sequence is discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 39 (1983), S. 99-100 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An inversion within the subterminal inversion in 2L ofDrosophila ananassae has been detected in a laboratory strain originating from Kuala Lumpur, Malaysia. The break points of inversion have been located in the reference map of salivary chromosomes. The data on the frequencies of different karyotypes indicate that inversion heterozygotes exhibit heterosis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 18 (1980), S. 5-13 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Les oxydes hydratés formés lors de l'addition du bicarbonate d'ammonium à une solution de Zn(NO3)2 et de Fe(NO3)2 suivie du séchage du précipité à 110°, sont l'hydroxy-carbonate de zinc(I) et le gel de l'oxyde de fer(III) (II). On a utilisé une nouvelle technique de thermogravimétrie en dérivation, ainsi que les méthodes d'ATD et TGD conventionnelles, pour étudier la réaction entre (I) et (II) dans le système à deux composants. Un mélange de (I) et de (II), soumis au broyage, donne environ 16 p.c. de ferrite de zinc «précurseur», tandis qu'un échantillon préparé par coprécipitation à partir de la solution des nitrates mixtes et séchage à 110°, en donne environ 70 p.c. La formation du spinelle de ferrite de zinc décrite comme ayant lieu, dans des cas similaires, à des températures faibles, paraît être en rapport avec la formation du «précurseur» ainsi qu'avec la réactivité et la température de la transformation de phase de Fe2O3.
    Abstract: Zusammenfassung Die durch Zugabe von Ammoniumbicarbonat zu einer Lösung von Zn(NO3)2 und Fe(NO3)3 und Trocknung des Niederschlags bei 110° gebildeten hydratisierten Oxide sind Zinkhydroxycarbonat (I) bzw. Eisen(III)oxidgel (II). Eine neue derivierte derivative thermogravimetrische Kurve wurde gemeinsam mit den konventionellen DTA und DTG Methoden zum Studium der Reaktion zwischen (I) und (II) in Zweikomponentensystemen eingesetzt. Das Gemisch von (I) und (II) ergibt beim Mahlen etwa 16% Zinkferrit »Prekursor«. In einer durch Mitfällung der gemischten Nitrate und Trocknung bei 110° erhaltenen Probe wurde fast 70 % »Prekursor« gebildet. Die Bildung von Zinkferritspinell, über dessen Entstehung in solchen Fällen bei niedrigen Temperaturen berichtet wird, scheint mit der Bildung des »Prekursors« verbunden zu sein, sowie mit der Reaktivität und der Phasenübergangstemperatur in Fe2O3.
    Notes: Abstract The hydrated oxides which are formed by the addition of ammonium bi-carbonate to a solution of Zn(NO3)2 and Fe(NO3)3, and drying the precipitates at 110° are zinc hydroxy carbonate(I) and iron(III) oxide gel(II), respectively. A new, derived derivative thermogravimetric curve along with conventional DTA and DTG methods have been used to study the reaction between (I) and (II) in two components system. A mixture of (I) and (II) subjected to grinding yields about 16% zinc ferrite ‘precursor’. In a sample prepared by coprecipitation from the mixed nitrate solution and drying at 110°, nearly 70% ‘precursor’ is formed. The formation of zinc ferrite spinel reported to take place at low temperature in such cases appears to be related with the formation of the ‘precursor’, and reactivity and phase transformation temperature in Fe2O3.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 57 (1981), S. 139-142 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Crosses were made between strains of Drosophila ananassae, homozygous for the ST or AL gene sequences in the second chromosome, and originating from geographically distant localities in India. All interracial crosses were maintained separately in culture bottles for ten generations. After ten generations it was observed that the inversion heterozygotes were heterotic. Thus it was found that interracial hybridization does not lead to breakdown of heterosis. Therefore, it has been suggested that localised coadaptation is absent in the natural populations of Indian D. ananassae. Thus D. ananassae does not show the pattern of some other species.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 60 (1983), S. 231-235 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Drosophila ananassae, three cosmopolitan inversions are very common in natural populations. Chromosomal polymorphism due to these inversions often persists when strains are maintained in the laboratory. A chromosomal analysis of a number of strains was made. Data on the frequencies of different gene sequences will be described separately. During the present investigation the same data have been analyzed in order to test the intra- and interchromosomal interactions in D. ananassae. The results reveal that interchromosomal interactions do not occur with respect to viability as unlinked inversions are associated randomly. However, the linked inversions of the third chromosome show non-random associations maintained by epistatic gene interaction and suppression of crossing over.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 59 (1982), S. 151-156 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Strains of Drosophila ananassae, each descended from a single inseminated female collected in nature, were maintained in laboratory cultures for 10 to nearly 50 generations. The chromosomal analysis of these strains was made immediately after their capture and chromosomal inversions were detected. The same strains were re-examined and it was found that all the strains remained polymorphic during the course of time. Although some of the strains did not show the same chromosomes which were ascertained at the original examination, they failed to become homozygous in all the chromosomes. Some old strains maintained for more than 100 generations but not established by the author were also examined and showed a persistence of inversion polymorphism. The strains were maintained by transferring between 20 and 40 flies to fresh food bottles in each generation and with this breeding system the strains should have become homozygous with respect to most of the unfixed genetic variants which they contained originally. But the strains remained chromosomally polymorphic, which shows that the inversion heterozygotes exhibit heterosis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 63 (1984), S. 49-52 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Inversion polymorphism has been studied in three natural populations of Drosophila ananassae. The three cosmopolitan inversions have been detected in all the three populations analysed. Some quantitative variations in the inversion frequencies seem to exist and the level of inversion heterozygosity varies between the different populations.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 64 (1984), S. 221-224 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Based on the differences in the gene arrangement frequencies average genetic distance has been estimated among natural populations of Drosophila ananassae. Genetic distance obtained by pairwise comparison ranges from 0.002 to 0.371. The most differentiated populations are those from the Andaman and Nicobar Islands. Although the populations from localities separated by a small geographic distance show less genetic distance, the relation between genetic distance and geographic distance does not seem to be positive.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 27 (1983), S. 263-273 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das thermische Zersetzungsverhalten des Hemihydrats von Kupferoxalat, sowie Scine Komplexe mit verschiedenen Aminen wurden mit den TG- und DTA-Methoden in Nitrogen- und Luft-Atmosphere untersucht. Die Komplexe CuC2O4 · 0.5 H2O, CuC2O4(NH3)2 und CuC2O4(py) ergaben nach der Zersetzung Cu2O als Endprodukt, wogegen eine andere Gruppe der Komplexe, d.h. CuC2O4(EtNH2)2. CuC2O4(MeNH2)2. CuC2O4(en)2 und CuC2O4(An)2 ein Endprodukt von CuO ergaben. All diese Komplexe zersetzten sich keine isolierbare, stabile Zwischenprodukte geformt zu haben, mit einer Ausnahme des CuC2O4(en)2, welches ein binukleares Zwischenkomplex, das [CuC2O4en]2 bildete.
    Abstract: Резюме Методами ТГ и ДТА изуч ено в атмосфере кислорода и азота тер мическое разложение полугидрата оксалат а меди и его комплексо в с различными аминами. П ри разложении комплексов CuC2O4 · O.5 H2O, CuC2O4(NH3)22 и CuC2O4(py) в качестве конечного продукта реакции обр азуется Cu2O, тогда как пр и разложении комплекс ов CuC2O4(EtNH2)2, CuC2O4(MeNH2)2, CuC2O4(en)2 и CuC2O4(An)2 — qoбразуется CuO. Все комплексы разлагают ся без образования ка ких-либо выделяемых стабильн ых промежуточных продуктов. Исключени е составлял комплекс CuC2O4(еn)2, который образует двухядерный комплек с (CuC2O4еn]2.
    Notes: Abstract The thermal decomposition behaviour of copper oxalate hemihydrate and its complexes with different amines has been studied by TG and DTA methods in nitrogen and air atmospheres. The complexes CuC2O4 · 0.5 H2O, CuC2O4(NH3)2 and CuC2O4(py) produced Cu2O as final residue after decomposition, whereas, another group of complexes, CuC2O4(EtNH2)2, CuC2O4(MeNH2)2, CuC2O4(en)2 and CuC2O4(An)2, gave a final residue of CuO. All the complexes decomposed without forming any isolable stable intermediate; an exception was CuC2O4(en)2, which formed a binuclear intermediate complex, [CuC2O4en]2.
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