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  • Springer  (78)
  • 1975-1979  (78)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The reproduction of some littoral molluscs from Macquarie Island (Sub-Antarctic) (1977)
    Springer
    Marine biology 44 (1977), S. 125-142 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The reproduction of 9 species of littoral molluscs from the sub-Antarctic Macquarie Island was examined. The mode of larval development is reported for all species, and the reproductive patterns for 7 are described from collections taken monthly over a period of 1 year. Two species release gametes for external fertilization, whereas the other 7 have non-pelagic development via brooding or the laying of egg cases; some of these findings were deducted from examination of gonads rather than by direct observation. Features of reproduction important in any correlation between a littoral animal's reproduction and its habitat are discussed, and relationships between pelagic and non-pelagic development of the Macquarie molluscs and (a) distribution in the local environment and (b) habitat are drawn. The widely recognised correlation between species having a non-pelagic development and small number and large size of eggs is considered as a method for predicting the type of larval development (in terms of pelagic versus non-pelagic) from an examination of the ovary. It is suggested that further data on modes of development could be obtained from specimens of marine invertebrates collected throughout southern latitudes and that such data would enhance zoogeographical interpretations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386953
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  • 2
    Electronic Resource
    Electronic Resource
    Breeding systems of dominant perennial plants of two disjunct warm desert ecosystems (1977)
    Springer
    Oecologia 27 (1977), S. 203-226 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A comparison of the floral syndromes, flower biomasses, pollen and total sugar production of the dominant perennial species of two climatically similar but disjunct desert scrub ecosystems was made to assess the degree of convergence in breeding systems. Results indicate that the dominants at the northern site in the Sonoran Desert near Tucson Arizona, USA, possess more diverse floral types, utilize more reproductive methods, produce a greater annual biomass of flowers, provide more rewards for potential pollinators and employ a wider array of pollen vectors than those at the southern site near Andalgalá, Catamarca, Argentina. The discrepancies in these features can be best explained in terms of the differences in the annual dispersion of rainfall at the two sites. However, when compared to the dominant species of two Mediterranean scrub ecosystems, the breeding systems of the dominants of the desert scrub sites proved to be more similar to one another than to those of a neighboring but different ecosystem type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347467
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  • 3
    Electronic Resource
    Electronic Resource
    Cytotoxic T-cell responses to H-Y:Ir genes and associative antigens map inH-2 (1977)
    Springer
    Immunogenetics 5 (1977), S. 453-459 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The secondary cytotoxic responses to the male-specific antigen (H-Y) in mice showH-2 restriction so that the cytotoxic female cell must share the K- and/or D-end antigen with the male target cells. The association with the K and/or D end varies with differentH-2 haplotypes,e.g., H-2 b cytotoxic cells require the H-2Db antigen(s) on the target cells, while cytotoxic cells fromH-2 b/H-2 d F1 mice sensitized toH-2 d male cells kill only male targets having H-2Kd antigen(s). This association of H-Y with appropriate K/D antigens seems to be needed also in the induction of the cytotoxic response. Of the independent haplotypes, onlyH-2 b strains are capable of making secondary anti-H-Y responses and this trait seems to be dominant,i.e., the F1 strains with oneH-2 b parent are able to produce anti-H-Y cytotoxic cells against both theH-2 b parent and the nonresponder parent. The mating of the two nonresponder strains may produce F1 mice which are responders, thus suggestingIr gene complementation. Mapping data indicates that at least one of these complementary genes is located in theI-C region fork/s complementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570504
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  • 4
    Electronic Resource
    Electronic Resource
    Serological properties of anti-Ly-6.2 serum produced by a new immunization schedule (1978)
    Springer
    Immunogenetics 7 (1978), S. 173-178 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01844004
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  • 5
    Electronic Resource
    Electronic Resource
    Observations of sequential changes in bone mass in postmenopausal women: a controlled trial of oestrogen and calcium therapy (1976)
    Springer
    Calcified tissue international 22 (1976), S. 217-224 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064068
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  • 6
    Electronic Resource
    Electronic Resource
    Ectopic calcification in lambs from feeding the plantCestrum diurnum (1979)
    Springer
    Calcified tissue international 29 (1979), S. 245-250 
    Details
    ISSN: 1432-0827
    Keywords: Tissue calcification ; Cestrum diurnum ; Lambs ; Plant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Hypercalcemia and ectopic calcification were induced in 5 lambs by supplementing the diet with the dried leaves of the plantCestrum diurnum, for 8 to 9 weeks. Lambs developed mineralization of blood vessels, heart, kidneys, and lungs. These tissues were examined by light and electron microscopy. In the vascular tissue there was calcification of elastic fibers in the hyperplastic intima and the media, along with mineralization of mitochondria of aortic smooth muscle cells. Myocardial cells and their mitochondria were mineralized. In the kidney, there was calcification of the epithelium of the distal convoluted tubules and collecting tubules, Bowman’s capsule, and the mesangial cells of the glomeruli. In the lung, there was mineralization of the alveolar septal walls and the bronchi and bronchioles. Feeding of the calcinogenic plant to lambs caused extensive soft tissue calcification. Results of the study indicated that degeneration was the early soft tissue lesion in this plant toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02408087
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  • 7
    Electronic Resource
    Electronic Resource
    1α-Hydroxycholecalciferol in renal osteodystrophy (1976)
    Springer
    Calcified tissue international 22 (1976), S. 105-111 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064049
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  • 8
    Electronic Resource
    Electronic Resource
    On the biosyntheses of artemisia ketone and bakuchiol (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 1121-1122 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary New biosynthetic pathways for the irregular terpenes, artemisia ketone and bakuchiol, are proposed. It is suggested that 2-(1-hydroxy-3-methylbutyl)thiamine and 2-(1-hydroxy-2-phenylethyl) thiamine are key intermediates in the biosyntheses of artemisia ketone and bakuchiol, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922903
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  • 9
    Electronic Resource
    Electronic Resource
    Isolation of temperature sensitive mutations blocking clone development inDrosophila melanogaster, and the effects of a temperature sensitive cell lethal mutation on pattern formation in imaginal discs (1975)
    Springer
    Development genes and evolution 178 (1975), S. 247-275 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A method of isolating temperature-sensitive (ts) mutations blocking clone development, based on the analysis of twin spots produced by X-ray induced somatic recombination is reported. From this screen 10 ts mutations were recovered which caused an absence of the lethal-bearing clone at the restrictive temperature. Eight of these mutations were analyzed. Seven proved to be autonomous ts cell lethals and one was an autonomous ts mutation which reversibly affected cell division and growth of imaginal disc cells and growth of larval cells. The effects on development of one of the cell lethal mutations,l(1)ts-504, are described. Heat pulses (29°C) 24–72 hrs long caused a high frequency (up to 90%) of morphologically abnormal animals. The abnormalities observed were of two major kinds: deficiencies and duplications of imaginal disc derivatives. In addition, alterations of tarsal segmentations occurred. Heat pulses to larvae also delayed pupariation and eclosion by as much as four days. In general, longer pulses led to a greater delay in pupariation and eclosion and a higher frequency of deficiencies and duplications than shorter pulses. Exposure to restrictive temperature early in larval development delayed pupariation and resulted in mostly normal animals; exposure during the second and early third larval instar also delayed pupariation and led to a high frequency of duplications; exposure later in larval life, i.e. mid and late third larval instar, caused no delay in pupariation but led to a high frequency of deficiencies. These results can be explained by the occurrence of areas of cell death, which can be seen in the imaginal discs of larvae exposed to restrictive temperature by staining with trypan blue. This conclusion is further supported by the observation in gynandromorphs of duplications of female nonmutant tissue. These results are discussed in relation to current theories of pattern formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848432
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  • 10
    Electronic Resource
    Electronic Resource
    A temperature sensitive mutation that reduces mitotic rate inDrosophila melanogaster (1976)
    Springer
    Development genes and evolution 179 (1976), S. 215-236 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A temperature-sensitive cell autonomous mutation ofDrosophila, l(1)ts-1126 (1–16±2), that affects the rate of cell division is described. When mutant animals are exposed to the restrictive temperature of 29°C during the first and second larval stages, the growth rate of the larvae is retarded. A delay in pupariation occurs during which larvae reach their full size, and the resulting flies are normal. When mutant animals are exposed to restrictive temperature during the third larval stage, growth is also retarded but no delay in pupariation occurs, and the resulting flies are reduced in size. Their small size is due in part to a decreased number of cells and in part to a smaller size of the cells. X-ray induced, marked, homozygousl(1)ts-1126 clones in an otherwise normal animal, are smaller in animals exposed to pulses of restrictive temperature when compared to clones in animals kept at permissive temperature of 22°C. Clone size decreases as pulse length increases. Clones on the wing blade induced 24 h after oviposition are smaller than clones induced at 48 h in animals grown at restrictive temperature. This result is interpreted as an inability of the slower dividingl(1)ts-1126 cells to survive when in competition with wildtype cells. The distribution of survivingl(1)ts-1126 clones in gynandromorphs grown at restrictive temperature supports this conclusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848647
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