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  • 1
    Electronic Resource
    Electronic Resource
    Maternal factors and the evolution of developmental mode: Evolution of oogenesis in Heliocidaris erythrogramma (1999)
    Springer
    Development genes and evolution 209 (1999), S. 275-283 
    Details
    ISSN: 1432-041X
    Keywords: Key words Echinoid ; Oogenesis ; Development ; Evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Evolutionary change in developmental mode in sea urchins is closely tied to an increase in maternal provisioning. We examined the oogenic modifications involved in production of a large egg by comparison of oogenesis in congeneric sea urchins with markedly different sized oocytes and divergent modes of development. Heliocidaris tuberculata has small eggs (95 µm diameter) and the ancestral mode of development through feeding larvae, whereas H. erythrogramma has large eggs (430 µm diameter) and highly modified non-feeding lecithotrophic larvae. Production of a large egg in H. erythrogramma involved both conserved and divergent mechanisms. The pattern and level of vitellogenin gene expression is similar in the two species. Vitellogenin processing is also similar with the gonads of both species incorporating yolk protein from coelomic and hemal stores into nutritive cells with subsequent transfer of this protein into yolk granules in the developing vitellogenic oocyte. Immunocytology of the eggs of both Heliocidaris species indicates they incorporate similar levels of yolk protein. However, H. erythrogramma has evolved a highly divergent second phase of oogenesis characterised by massive deposition of non-vitellogenic material including additional maternal protein and lipid. Maternal provisioning in H. erythrogramma exhibits recapitulation of the ancestral vitellogenic program followed by a novel oogenic phase with hypertrophy of the lipogenic program being a major contributor to the increase in egg size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004270050253
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  • 2
    Electronic Resource
    Electronic Resource
    Thermoelastic stresses and strains in a gravitating earth (1963)
    Springer
    Pure and applied geophysics 55 (1963), S. 21-30 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The stress and strain fields in various earth models are studied under the assumption of an elastic mantle and the existence of thermal stresses which are proportional to the difference between the initial and present temperatures. The thermoelastic equilibrium equation for a 49-layered earth with spherical symmetry is integrated and programmed for various combinations of velocities, densities and temperatures. Results show that the strains in the upper mantle depend to a great extent on the thermal model. Central radial strain ranges from 5.2 to 7.3 per cent and the central pressure ranges between 3.1 and 3.7×1012 dynes/cm2 for all models. It is established that the thermal history of the earth could not have changedBullen's pressures by more than 0.4×1012 dynes/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02011211
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  • 3
    Electronic Resource
    Electronic Resource
    Focal epithelial hyperplasia: human-papillomavirus-induced disease with a genetic predisposition in a Venezuelan family (1993)
    Springer
    Human genetics 〈Berlin〉 91 (1993), S. 386-388 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A study on the presence of human papillomavirus (HPV) DNA sequences and focal epithelial hyperplasia (FEH) in a family of Venezuelan ancestry has revealed that FEH is an HPV-induced disease presenting familial aggregation. The genealogical evidence indicates a genetic predisposition to the disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217363
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  • 4
    Electronic Resource
    Electronic Resource
    Coeficient of relationship (RI) within and between four black venezuelan populations (1997)
    Springer
    International journal of anthropology 12 (1997), S. 55-62 
    Details
    ISSN: 1824-3096
    Keywords: Coefficient Ri ; Isonymy ; Population Structure ; Venezuelan populations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The coefficient of relationship by isonymy Ri was obteined using paternal and maternal surnames of individuals in four black Venezuelan populations. The analysis of eight Ri values obtained from different combinations of surnames within each population and between population in two periods of time (1900–1920 and 1944–1967) show that: 1) Higher values of Ri are those that include combinations of maternal surnames, 2) Ri values of the second period are higher than those shown in the first, 3) No correlation was observed between Ri values and geographic distance. These results indicate that there is a tendency towards matrilocal behavior and show agreement with the degree of isolation of each population. The use of four surnames for estimating the coefficient of relationship by isonymy Ri, permits better comparisons of the relationship between and within groups and gives detailed information of the population structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447897
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of the mast cell disruptor B.W. 48/80 on dietary atherosclerosis in the male rabbit (1967)
    Springer
    Cellular and molecular life sciences 23 (1967), S. 68-69 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Mit Cholesterin ernährte Kaninchen, denen gleichzeitig Compound 48/80 injiziert wurde, wiesen gegenüber nur mit Cholesterinzusatz gefütterten Tieren geringere Atheromatose des Aortenbogens auf. Compound 48/80 rief auch eine Verminderung des Serumcholesteringehaltes hervor. Unter dem Einfluss von Compound 48/80 schien ein beschleunigter Abbau der atheromatösen Plaques einzusetzen bevor noch eine Verminderung des Serumcholesterins auftrat. Es wird vermutet, dass der Schutz von Compound 48/80 gegen die durch Diät erzeugte Atheromatose des Kaninchens auf einer Veränderung des arteriellen Glykosaminglykans beruht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02142275
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  • 6
    Electronic Resource
    Electronic Resource
    Report of the work group on savannas and shrublands (1982)
    Springer
    Plant and soil 67 (1982), S. 409-413 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182790
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  • 7
    Electronic Resource
    Electronic Resource
    Nitrogen in litterfall and precipitation and its release during litter decomposition in the Chilean piedmont matorral (1982)
    Springer
    Plant and soil 67 (1982), S. 359-365 
    Details
    ISSN: 1573-5036
    Keywords: Chile ; Lithraea caustica ; Litterfall ; N-cycling ; Piedmont-matorral ; Quillaja saponaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumen En el matorral premontano de Chile se estudiaron algunas partes del ciclo de nitrógeno de dos de sus dominantes (Lithraea caustica y Quillaria saponaria) durante 15 meses. Los análisis mostraron que los ingresos de nitrógeno por lluvia y deposición seca fueron de 8,5 kg N ha−1 año−1; este valor podría ser mayor si se considera el ingreso adicional por impactación de compuestos nitrogenados sobre la vegetación (no medido). Debido a su mayor cobertura porcentual,L. caustica contribuyó con mas hojarasca queQ. saponaria obteniendose valores de 1089 y 737 kg ha−1 materia seca año−1 respectivamente. Sin embargo, al considerar el area bajo los individuos,Q. saponaria produjo mas hojarasca queL. caustica (640vs 350 g materia seca m−2 año−1. Durante la descomposición de la hojarasca,L. caustica liberó 2,61 g N kg−1 hojarasca seca año mientras queQ. saponaria liberó 0,60 g N kg−1 hojarasca seca año−1.
    Notes: Abstract Parts of the nitrogen cycle involving two dominants (Lithraea caustica andQuillaja saponaria) in the Chilean piedmont matorral have been studied over a 15-month period. Analyses showed that 8.2 kg N ha−1 yr−1 entered the system in rainfall and dry deposition, though impaction of N-containing compounds on vegetation (not measured) may elevate this value.L. caustica, by virtue of its greater percent cover, contributed more leaf litter than didQ. saponaria to the system (1089,vs 737 kg dry matter ha−1 yr−1, respectively), although on an individual basisQ. saponaria produced more litter (640,vs 350 g dry leaf litter m−2 yr−1 rL. caustica). This plus the greater nitrogen release ofL. caustica leaf litter during decomposition (2.61,vs 0.60 g N kg dry litter−1 yr−1 forQ. saponaria) andQ. saponaria's higher N-content of dropped leaves (0.54,vs 0.37% N forL. caustica) may indicate a more external cycling of nitrogen inQ. saponaria relative to that inL. caustica. These two species may therefore represent two different strategies of individual nitrogen cycling, external and internal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182783
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  • 8
    Electronic Resource
    Electronic Resource
    Organellar DNA restriction fragment length polymorphism (RFLP) and nuclear random amplified polymorphic DNA (RAPD) analyses of morphotypes of Gracilaria (Gracilariales, Rhodophyta) from Chile (1996)
    Springer
    Hydrobiologia 326-327 (1996), S. 229-234 
    Details
    ISSN: 1573-5117
    Keywords: Gracilaria ; morphotypes ; RAPD analysis ; RFLP analysis ; seaweed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extreme phenotypic variability recognized among the species of Gracilaria has highlighted the need for the application of refined methods to help solve taxa identifications. In Chile, there still exists uncertainty about the exact number of Gracilaria species. Our investigations are centered on DNA analyses of morphotypes collected from different geographical locations, namely Lenga and Isla Santa María, Region VIII (36°00′ S to 38°00′ S), and Maullín, Region X (39°30′ S to 43°40′ S). These two regions of Chile are considered as areas of confluence of G. chilensis, G. verrucosa, and a species of Gracilariopsis. In this study four morphotypes, from a natural bed located in Maullín, were analyzed for RFLP of plastid DNA and the results compared with data of four morphotypes from a bed in Lenga. The DNA banding patterns from each enzyme digest were identical irrespective of morphotypes and/or locations. In an attempt to unravel the nature of the morphological differences found among Lenga and Maullín morphotypes, RAPD analyses of nuclear DNA were also performed; however, no polymorphism has been found yet. Therefore, the data of this study, as well as concurrent data from preliminary interfertility tests, suggest that all morphotypes belong to a single taxon, Gracilaria chilensis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047812
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  • 9
    Electronic Resource
    Electronic Resource
    Familial correlations of variables from the craniofacial complex in a Venezuelan isolate of African origin (1986)
    Springer
    International journal of anthropology 1 (1986), S. 205-213 
    Details
    ISSN: 1824-3096
    Keywords: Familial aggregation ; Craniofacial complex ; Venezuelan Isolate ; African Origin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Familial aggregation for 33 different variables from the craniofacial complex was estimated through intraclass correlation coefficients for four different relationships: parent-offspring paris, sibs, cousins and unrelated pairs. The population chosen for the study was La Sabana, D.F., a Venezuelan isolate of Negroid origin. The general tendency observed among the different correlations was as anticipated: sibs show higher correlations than cousins and these were higher than for unrelated pairs. Parent-offspring correlations were lower than expected. The significant correlations observed among sibs for 17 of the variables indicate aggregation due to genetic and/or common environmental factors. On the other hand, little genetic determination was detected for sella-C point distance or for upper dental arch depth both of which show intraclass sib correlations ≤0.1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442034
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  • 10
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    Noisy CO oxidation on Iridium(111) surfaces (2014)
    Springer
    Details
    Publication Date: 2014-01-01
    Print ISSN: 1951-6355
    Electronic ISSN: 1951-6401
    Topics: Physics
    Published by Springer
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