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  • Electronic Resource  (59)
  • 1980-1984  (55)
  • 1950-1954  (4)
  • 11
    Electronic Resource
    Electronic Resource
    A Culture Method for Growing Small Free-Living Amœbæ for the Study of their Nuclear Division (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 65-66 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE genera and species among the small free-living, intestinal and parasitic amoebae have been largely created by previous workers on the basis of their nuclear structure and their mode of nuclear division. A review of the literature on the nuclear division in small free-living amoebae clearly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165065a0
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Study of point-defect aggregates in nearly perfect silicion single crystals using a high-resolution diffuse X-ray scattering technique (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 178-182 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: High-resolution diffuse X-ray scattering (DXS) measurements have been made on dislocation-free silicon single crystals of the following types: (1) as-grown specimen with no heat treatment (labelled as NHT); (2) specimen heated at 1273 K under oxygen for 10 h [labelled as HT(1)] and (3) specimen heated at 1273 K under oxygen for 50 h [labelled as HT(2)]. Reciprocal space around the 111 reciprocal-lattice point in (1,-1,1) geometry has been explored using a Cu Kα exploring beam. From the distribution of DXS intensity it was found that for sample NHT, the observed DXS is predominantly due to aggregates of vacancies. Heating the specimen under oxygen produces defect aggregates of interstitial type. Infrared absorption measurements showed that the area under the 9 μm absorption band decreases, suggesting that oxygen ions aggregate into clusters of interstitial type. Transmission X-ray topographs also support these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480000381
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    The antennae and mating behaviour ofDrosophila females (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 237-238 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01945086
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  • 14
    Electronic Resource
    Electronic Resource
    Natural hybridization inDrosophila (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 290-290 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Although at least 159 cases of interspecific hybridization between closely related species ofDrosophila have been obtained under laboratory conditions, only 7 cases of natural interspecific hybridization have been recorded. We report yet another case, concerningD. malerkotliana andD. bipectinata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952281
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  • 15
    Electronic Resource
    Electronic Resource
    Endogenous gibberellins and amylase activity in tall and dwarf strains of rice (Oryza sativa) (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 363-364 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 2 tall and 7 dwarf strains of rice were sprayed with 0 or 40 μg ml−1 GA3, 4 dwarf strains responded to exogenous GA3, and showed a markedly lower endogenous gibberellin content than the tall strains, while 2 dwarf strains did not respond to GA3 application and had considerably higher endogenous gibberellin levels than the tall ones. Amylase activity in germinating seeds showed a significant negative correlation with the endogenous gibberellin content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959863
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    One-sided sexual isolation betweenDrosophila takahashii andDrosophila pseudotakahashii (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 318-318 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01949365
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  • 17
    Electronic Resource
    Electronic Resource
    An inversion within the subterminal inversion inDrosophila ananassae (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 99-100 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF01960651
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  • 18
    Electronic Resource
    Electronic Resource
    Isolation and partial characterization of cuticular collagen from the parasitic nematodeGaigeria pachyscelis (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 719-720 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The cuticle from adultGaigeria pachyscelis was isolated by solubilizing the internal tissues with sodium dodecyl sulphate (SDS) at 37°C. Cuticular protein was extracted with guanidine-HCl and β-mercaptoethanol and purified by ammonium sulphate fractionation and DEAE-cellulose chromatography. SDS-polyacrylamide gel electrophoresis of purified protein revealed 2 polypeptides with apparent mol. wts of 58,000 and 74,000. As judged from their hydroxyproline content both of them are collagenous in nature. Results of gel filtration indicate that cuticular collagen exists in two forms, a non-associated form at low concentration and an associated form at high concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949742
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  • 19
    Electronic Resource
    Electronic Resource
    Hoechst fluorescence pattern of heterochromatin in three closely related members of Drosophila (1982)
    Springer
    Chromosoma 87 (1982), S. 503-506 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Heterochromatin distribution in metaphase chromosomes of three morphologically and karyologically similar members of Drosophila, D. s.sulfurigaster, D. s.bilimbata and D. pallidifrons was studied by the Hoechst 33258 staining method. Comparison showed remarkable uniformity of H-heterochromatin among the three members except for in their Y-chromosomes. On the basis of these observations phylogenetic relationships are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333471
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  • 20
    Electronic Resource
    Electronic Resource
    Radioprotection of euoxic bacteria by phenothiazine drugs (1984)
    Springer
    Radiation and environmental biophysics 23 (1984), S. 279-285 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary Survival studies on irradiated euoxicE. coli B/r cells in presence of various concentrations of four radioprotecting phenothiazine drugs have been carried out. Maximum radioprotection was obtained at a optimal concentration for each drug and it decreased on either side of it. The DNA strand break studies at the maximum protective and non-protective concentrations of chlorpromazine and promethazine revealed that the number of ssbs in DNA were less at the protective concentration which were efficiently repaired by the type-III repair process. On the other hand, at the non-protective concentrations, inhibition of DNA repair was noticed and a higher number of DNA ssbs were detected. We suggest that the membrane is fluidized to a greater extent at the protective concentrations allowing the chemical restitution of damaged sites by NPSH compounds. At the non-protective high concentrations of the drugs, the membrane may be too grossly disorganised to allow any repair and at the same time high concentrations of the drugs or their radicals may also react with radioprotective intracellular sulphhydryls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01407599
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