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  • Springer  (47)
  • Wiley  (9)
  • Springer Nature  (7)
  • National Academy of Sciences  (1)
  • 2020-2024  (1)
  • 1980-1984  (63)
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  • 1
    Digitale Medien
    Digitale Medien
    A comparative study of photoadaptation in four diatoms isolated as endosymbionts from larger foraminifera (1982)
    Springer
    Marine biology 68 (1982), S. 193-197 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Four endosymbiotic diatoms were isolated from 2 species of larger foraminifera collected in the Red Sea and Hawaii. The photoadaptive responses of the cultured diatoms were measured at 312, 19 and 7 μW cm-2. Two of the diatoms (Fragilaria shiloi and Nitzschia laevis), both isolated from Amphistegina lessonii, grew fastest at 312 μW cm-2. The other two diatoms (N. valdestriata and N. panduriformis) which were isolated from Heterostegina depressa, grew best at 19 μW cm-2. Of the four diatoms, F. shiloi grew best at high light levels. Also in F. shiloi, chlorophyll c content per cell was directly proportional to light intensity; in contrast chlorophyll a and carotenoids increased to maxima at 19 μW cm-2. The chlorophyll a and c and carotenoid content of N. valdestriata were also maximal at 19 μW cm-2. Photosynthetic rates, measured by respirometry, suggested that the diatoms were photoinhibited at higher light intensities and did well at moderately low light intensities (175μW cm-2). The photocompensation points of all 4 diatoms were about 2% of the light available in the spring at 1-m depth at Elat on the Red Sea. At Elat the photocompensation point would lie between 40 and 50 m if the algae were free in nature. The amount of attenuation of light by the shells of the host has not yet been measured. Presumably photocompensation of the algae within hosts is reached at depths less than 40 m.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00397606
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Conservation of nonhistone chromosomal proteins through dipteran evolution (1980)
    Springer
    Chromosoma 79 (1980), S. 65-74 
    Details
    ISSN: 1432-0886
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract We have investigated the possibility that some high molecular weight nonhistone chromosomal (NHC) proteins may have been conserved through the evolution of two distantly related diptera-Drosophila melanogaster and Sciara coprophila. Antisera produced against three NHC protein subfractions were analyzed for cross-reactivity with Sciara polytene chromosomes. The indirect immunofluorescent staining technique used couples an assay for immunologic cross-reactivity with an assay for the in situ distribution of the proteins under study. The results indicate that the σ-φ and ϱ NHC protein antigens have been conserved since the divergence of Drosophila and Sciara, while the Drosophila π NHC protein antigen is not present on Sciara chromosomes. In one case, with anti-σ-φ serum, we have identified a highly conserved, very high molecular weight NHC protein (or class of proteins) which appears to interact strongly with all chromatin in a manner which is not DNA sequence-specific. In the second case, with anti-ϱ serum, we have identified an NHC protein which may have evolved an additional function(s) in Sciara relative to its function(s) in Drosophila.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00328473
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Lectin binding sites of the mouse ovary, intraovarian and ovulated ova (1984)
    Springer
    Histochemistry and cell biology 80 (1984), S. 527-533 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Fluorescein isothiocyanate (FITC) labeled lectins were used to study the distribution of specific binding sites in histologic sections of mouse ovaries as well as ovulated ova. Four distinct patterns of reactivity of the components of the follicle (exclusive of the ovum) and the surrounding ovarian stroma were recognized: 1. uniform staining of granulosa cells, theca cells and surrounding stroma; 2. weak to moderate staining of the granulosa cells and strong staining of the theca cells and stromal cells; 3. no reactivity of the granulosa cells coupled with strong reactivity of the theca and stromal cells; 4. no reactivity with any component of thecumulus oophorus. Three lectins (from Triticum vulgare, Arachis hypogaea and Maclura pomifera) distinctly accentuated the basal lamina of thecumulus oophorus. The reaction of lectins with oocytes and zona pellucida revealed six distinct patterns: 1. no reactivity with either structure; 2. weak reactivity with the cytoplasm of the oocyte and no reactivity with the zona pellucida; 3. very strong reactivity with the cytoplasm of the oocyte and no reactivity with the zona pellucida; 4. moderate reactivity with both the oocyte and the zona pellucida; 5. moderate reactivity with the oocyte and very strong reactivity with the zona pellucida; 6. no reactivity with the oocyte and moderate reactivity with the zona pellucida. The same pattern of reactivity was seen in the ovulated ova in the oviduct except for the lectin from Arachis hypogaea, the reactivity of which changed upon ovulation and/or fertilization of the ovum. These data provide a list of lectin markers for distinct components of the mouse ovary.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553712
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Lectin binding sites of the mouse ovary, intraovarian and ovulated ova (1984)
    Springer
    Histochemistry and cell biology 80 (1984), S. 527-533 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Fluorescein isothiocyanate (FITC) labeled lectins were used to study the distribution of specific binding sites in histologic sections of mouse ovaries as well as ovulated ova. Four distinct patterns of reactivity of the components of the follicle (exclusive of the ovum) and the surrounding ovarian stroma were recognized: 1. uniform staining of granulosa cells, theca cells and surrounding stroma; 2. weak to moderate staining of the granulosa cells and strong staining of the theca cells and stromal cells; 3. no reactivity of the granulosa cells coupled with strong reactivity of the theca and stromal cells; 4. no reactivity with any component of thecumulus oophorus. Three lectins (from Triticum vulgare, Arachis hypogaea and Maclura pomifera) distinctly accentuated the basal lamina of thecumulus oophorus. The reaction of lectins with oocytes and zona pellucida revealed six distinct patterns: 1. no reactivity with either structure; 2. weak reactivity with the cytoplasm of the oocyte and no reactivity with the zona pellucida; 3. very strong reactivity with the cytoplasm of the oocyte and no reactivity with the zona pellucida; 4. moderate reactivity with both the oocyte and the zona pellucida; 5. moderate reactivity with the oocyte and very strong reactivity with the zona pellucida; 6. no reactivity with the oocyte and moderate reactivity with the zona pellucida. The same pattern of reactivity was seen in the ovulated ova in the oviduct except for the lectin from Arachis hypogaea, the reactivity of which changed upon ovulation and/or fertilization of the ovum. These data provide a list of lectin markers for distinct components of the mouse ovary.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02400967
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Pregnancy-Related changes in the mouse oviduct and uterus revealed by differential binding of fluoresceinated lectins (1983)
    Springer
    Histochemistry and cell biology 79 (1983), S. 365-375 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The binding of 20 fluorescein isothiocyanate (FITC)-labeled lectins to various portions of the pregnant and non-pregnant murine oviduct and uterus was studied by fluorescence microscopy. Five lectins (from Ricinus communis (RCA-I), Maclura pomifera (MPA), Triticum vulgare (wheat germ-WGA), Bauhinia purpurea (BPA), and Ulex europeus (UEA-I)) reacted differentially with the epithelium of pregnant as compared with the non-pregnant uterus. The binding of RCA-I, MPA and WGA delineated pregnancy-related changes in the distal oviduct and colliculus tubaris. WGA recognized also pregnancy related changes in the proximal oviduct. The reactivity of the remaining 15 lectins did not distinguish the pregnant and non-pregnant oviduct and uterus, although some of them served to identify specific components of the mouse genital tract. Thus, Soybean lectin (SBA) reacted almost exclusively with the colliculus tubaris. UEA-I alone reacted exclusively with the epithelium of the non-pregnant uterus. RCA-II reacted preferentially with the epithelium of the oviduct and uterus as compared with its weak reactivity with the stroma. Two lectins (from Pisum sativum and Lens culinaris) reacted selectively with stromal cells of the uterus and oviduct. Present data indicate that the differential binding properties of these FITC-labeled lectins can be exploited to identify certain components of the mouse oviduct and uterus and to indicate changes in the cell surface and/or cytoplasm in these structures during pregnancy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00491772
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    An alpha globin pseudogene is located within the mouse t complex (1984)
    Springer
    Immunogenetics 19 (1984), S. 368-368 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00345413
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Reevaluation of the evidence for the generation of new lethal t haplotypes by mutation (1983)
    Springer
    Immunogenetics 18 (1983), S. 91-96 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00401359
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    An alpha globin pseudogene is located within the mouse t complex (1984)
    Springer
    Immunogenetics 19 (1984), S. 125-130 
    Details
    ISSN: 1432-1211
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Restriction fragment length polymorphisms have been identified in the α-globin pseudogene carried on chromosome 17. Different inbred strains of mice carry one of two forms of the sequence, whereas all complete t haplotypes carry a third form. With the use of partial t haplotypes, the α-ψ44 sequence has been mapped to the distal end of the t complex. This sequence appears to be closely linked to the tufted locus in the t complex.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00387855
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Single crystal elastic constants of tungsten monocarbide (1982)
    Springer
    Journal of materials science 17 (1982), S. 2657-2660 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The elastic constants of single crystal tungsten monocarbide were determined using highfrequency (20 to 50 mHz) ultrasonic pulse-echo measurements. The measured values from this study are a full order of magnitude lower than the previously reported values estimated from X-ray elastic constants. The elastic modulus of polycrystalline tungsten carbide was also measured to verify the accuracy of the ultrasonic method used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00543901
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Effects of higher education on achievement for blacks and whites (1983)
    Springer
    Research in higher education 19 (1983), S. 3-9 
    Details
    ISSN: 1573-188X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Wissenschaftskunde und Wissenschaftsorganisation, Hochschul- und Universitätswesen, Museumswissenschaft
    Notizen: Abstract This study assesses the impact of college on knowledge of vocabulary and mathematics. Unlike many previous studies, this one is able to control for precollege abilities in these academic areas, which presumably tend to select people into or out of college. The results indicate that college attendance has a strong impact on improved performance on these tests, and that these effects are similar for whites and blacks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00977335
    Standort Signatur Erwartet Verfügbarkeit
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