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  • Life and Medical Sciences  (2)
  • Pollution  (2)
  • 168-1025C; 168-1027C; 168-1028A; 168-1032A; Aluminium oxide; Calcium oxide; Calculated; Chromium(III) oxide; Comment; Distance; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Event label; Iron oxide, FeO; Joides Resolution; Juan de Fuca Ridge, North Pacific Ocean; Latitude of event; Leg168; Longitude of event; Magnesium oxide; Manganese oxide; Minerals; North Pacific Ocean; Ocean Drilling Program; ODP; Potassium oxide; Rock type; Sample code/label; Sample comment; Sample position; Silicon dioxide; Sodium oxide; Sulfite; Sum; Titanium dioxide  (1)
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  • 1
    facet.materialart.
    Unknown
    (Table 3) Composition of non-oxidative phases (stage 3) of altered rocks with increasing distance across the eastern flank of the Juan de Fuca Ridge, ODP Leg 168 data (1999)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 168-1025C; 168-1027C; 168-1028A; 168-1032A; Aluminium oxide; Calcium oxide; Calculated; Chromium(III) oxide; Comment; Distance; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Elevation of event; Event label; Iron oxide, FeO; Joides Resolution; Juan de Fuca Ridge, North Pacific Ocean; Latitude of event; Leg168; Longitude of event; Magnesium oxide; Manganese oxide; Minerals; North Pacific Ocean; Ocean Drilling Program; ODP; Potassium oxide; Rock type; Sample code/label; Sample comment; Sample position; Silicon dioxide; Sodium oxide; Sulfite; Sum; Titanium dioxide
    Type: Dataset
    Format: text/tab-separated-values, 171 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Unique qualities and special problems of the African Great Lakes (1986)
    Springer
    Environmental biology of fishes 17 (1986), S. 161-183 
    Details
    ISSN: 1573-5133
    Keywords: Meromictic ; Evolution ; Diversity ; Cichlidae ; Productivity ; Aquatic reserves ; Flushing ; Pollution ; Fish introductions ; Lake development ; Limnology ; Fishery management ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The African Great Lakes consist of large, deep rift valley lakes (e.g. Malawi & Tanganyika) and shallower lakes between the Eastern and Western Rifts (e.g. Victoria). They are a group comparable in size to the North American Great Lakes, but are old. Most are seasonally thermally stratified, and wind is the decisive factor that determines the annual cycle of cooling and mixing. Lakes Tanganyika, Malawi and Kivu are meromictic, with deep relict hypolimnia. Large magnitudes and time scales of periodic internal motion, where these have been measured, appear unique among lakes. These lakes harbour the world's richest lacustrine fish faunas, and the family Cichlidae provides the supreme example of geographically circumscribed vertebrate evolution. The lakes provide a unique comparative series of natural laboratories for evolutionary studies. Primary production is generally high, but in the deeper lakes standing stocks of plankton and of small fish species are low. These pelagic populations are characterised by very high P:B ratios. The fisheries are productive and of socio-economic importance. Large-scale mechanised fishing is not compatible with the survival of the diverse fish communities. Cichlids appear especially vulnerable to unselective fishing. Aquatic reserves might offer a means of survival for at least some communities. Various pollution threats exist. Because water retention times are long, extremely long for some deep lakes, and flushing rates are low, the lakes are vulnerable to pollution which would be long-lasting. Introductions of alien fishes have mostly had undesirable or disastrous results. While the faunas are one of the significant natural heritages of mankind, their conservation must realistically be linked to the legitimate development of the lakes for the well-being of the people who live there. Scientific value alone will not protect the lakes. Just as survival of African terrestrial wildlife in extensive reserves depends heavily upon tourism, so also might the cichlid flocks in underwater reserves. Greater interest from the international scientific community is needed to further rational development and conservation of these great lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002094
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Unique qualities and special problems of the African Great Lakes (1986)
    Springer
    Environmental biology of fishes 17 (1986), S. 161-183 
    Details
    ISSN: 1573-5133
    Keywords: Meromictic ; Evolution ; Diversity ; Cichlidae ; Productivity ; Aquatic reserves ; Flushing ; Pollution ; Fish introductions ; Lake development ; Limnology ; Fishery management ; Conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The African Great Lakes consist of large, deep rift valley lakes (e.g. Malawi & Tanganyika) and shallower lakes between the Eastern and Western Rifts (e.g. Victoria). They are a group comparable in size to the North American Great Lakes, but are old. Most are seasonally thermally stratified, and wind is the decisive factor that determines the annual cycle of cooling and mixing. Lakes Tanganyika, Malawi and Kivu are meromictic, with deep relict hypolimnia. Large magnitudes and time scales of periodic internal motion, where these have been measured, appear unique among lakes. These lakes harbour the world's richest lacustrine fish faunas, and the family Cichlidae provides the supreme example of geographically circumscribed vertebrate evolution. The lakes provide a unique comparative series of natural laboratories for evolutionary studies. Primary production is generally high, but in the deeper lakes standing stocks of plankton and of small fish species are low. These pelagic populations are characterised by very high P:B ratios. The fisheries are productive and of socio-economic importance. Large-scale mechanised fishing is not compatible with the survival of the diverse fish communities. Cichlids appear especially vulnerable to unselective fishing. Aquatic reserves might offer a means of survival for at least some communities. Various pollution threats exist. Because water retention times are long, extremely long for some deep lakes, and flushing rates are low, the lakes are vulnerable to pollution which would be long-lasting. Introductions of alien fishes have mostly had undesirable or disastrous results. While the faunas are one of the significant natural heritages of mankind, their conservation must realistically be linked to the legitimate development of the lakes for the well-being of the people who live there. Scientific value alone will not protect the lakes. Just as survival of African terrestrial wildlife in extensive reserves depends heavily upon tourism, so also might the cichlid flocks in underwater reserves. Greater interest from the international scientific community is needed to further rational development and conservation of these great lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698196
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The natural history of African lungfishes (1986)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 190 (1986), S. 163-179 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Remarkably little is known about the biology of the four Protopterus species, apart from certain detailed studies on their nesting behavior and estivating habits. What information we do have indicates that the species are essentially omnivorous carnivores (especially as predators on molluscs) and that they occupy a wide variety of habitats both lentic and lotic. As obligatory air-breathers able to survive temporary and sometimes extended desiccation of a habitat, lungfishes are often permanent residents in areas from which most actinopterygian fishes are excluded.All four species are able to survive prolonged dry periods. The methods they employ in so doing are varied, and include the secretion of subterranean cocoons, lying-up in water-filled subsurface burrows, or simply burrowing into moist regions of the substrate. Some populations of at least two species live in permanent water and so do not estivate, although they apparently retain the ability to do so.Three of the four species spawn in some form of seemingly constructed or prepared nest. The architecture of these nests shows marked inter- and intraspecific variability and is likely to be determined largely by various environmental factors. All three species show some type of parental care. The breeding biology of the fourth species, P. amphibius, is still unknown.Other aspects of the breeding biology and behavior of Protopterus require a great deal more investigation, as does the biology of the young.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051900412
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Tissue-Specific variation in the length of the 5′ untranslated region of the βa-inhibin mRNA in sheep (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 40 (1995), S. 1-8 
    Details
    ISSN: 1040-452X
    Keywords: Activin ; Expression ; Fecundity gene ; FecB ; Primer extension ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The 5′ untranslated region (UTR) of βA inhibin mRNA was compared in a variety of sheep tissues, using primer extension. Considerable variation in the length and number of 5′ extended products were noted between tissues. Specific bands were noted in ovarian follicular RNA, which were also present in samples from corpora lutea, stroma, and placental cotyledon RNA. Other extended products were observed in RNA from corpora lutea, stroma, cotyledon, pituitary, bone marrow, frontal cortex, medial basal hypothalamus, adrenal, liver, and kidney, which were not present or weakly represented in follicular RNA, Additional tissue-specific bands were noted in testis and bone marrow RNA. No specific differences in the lengths of the 5′ UTR of the βA inhibin mRNA were observed in sheep homozygous for the Booroola fecundity gene FecB, in any tissue studied. The coding region of ovine βA inhibin cDNA was sequenced and a genetic polymorphism confirmed within or close to the ovine βA inhibin gene.We conclude that the βA inhibin gene is expressed widely in the sheep. Furthermore there is variation in the length of the 5′ UTR of βA inhibin mRNA between male and female gonads and other tissues, implying that expression of this gene is differentially controlled. However, the FecB mutation does not affect mRNA splicing events or the initiation site used in ovarian transcription. The mechanism by which the FecB mutation influences the amounts of βA inhibin mRNA, follicle-stimulating hormone (FSH) secretion and ovulation rate has still to be elucidated. © 1995 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080400102
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