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  • 1
    Electronic Resource
    Electronic Resource
    Diversity of soft-bottom benthos in a tropical estuary: Gulf of Nicoya, Costa Rica (1984)
    Springer
    Marine biology 81 (1984), S. 97-106 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The community structure of soft-bottom infauna is described for the Gulf of Nicoya, Costa Rica, Central America, with special reference to the relationship between diversity and a tropical estuary. Of the 205 species of invertebrates collected in July, 1980, polychaetes comprised 58.6% by number of species and 68.1% by number of individuals. Density ranged from zero to 8 744 m-2 with a mean of 1 269 m-2 per station, and biomass ranged from zero to 10.986 g m-2 with a mean of 2.010 g m-2. Numerical analysis indicated considerable faunal homogeneity, characterized by polychaetes. Five major polychaete feeding guilds were recognized. From measures of diversity we concluded that the soft-bottom community of the Gulf of Nicoya was not rich for a tropical estuary. Physical processes (riverine runoff and frontal systems) mainly influenced community structure and function in the lower Gulf whereas biological processes (predation) seemed to prevail in the upper Gulf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397631
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  • 2
    Electronic Resource
    Electronic Resource
    Interannular diastereoselectivity in the hydroboration of functionalized 1-cyclohexylcyclohexenes (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 1978-1987 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00269a042
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  • 3
    Electronic Resource
    Electronic Resource
    Synthetic and mechanistic studies of the retro-Claisen rearrangement. 2. A facile route to medium-ring heterocycles via rearrangement of vinylcyclopropane- and cyclobutanecarboxaldehydes (1993)
    s.l. : American Chemical Society
    The @journal of organic chemistry 58 (1993), S. 1295-1297 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00058a001
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  • 4
    Electronic Resource
    Electronic Resource
    Cationic synthesis of macromers (1980)
    Springer
    Polymer bulletin 3 (1980), S. 83-89 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Unsaturated oxocarbenium salts were used to initiate the polymerization of THF. The macromers obtained were characterized carefully, and it was found that these species are well defined, of narrow molecular weight distribution, and fitted quantitatively with end standing polymerizable double bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263209
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  • 5
    Electronic Resource
    Electronic Resource
    Seismic strength of adobe masonry (1986)
    Springer
    Materials and structures 19 (1986), S. 253-258 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Résumé On examine d’abord les caractéristiques de résistance essentielles de la maçonnerie de terre. Ensuite, en s’appuyant sur le savoir acquis, on étudie l’influence de certains adjuvants naturels. On propose enfin quelques essais in situ simples, conçus pour identifier les matériaux les plus adéquats pour la construction de terre et faciles à faire connaître au constructeur potentiel.
    Notes: Abstract The most important soil characteristies from the viewpoint of the strength of adobe masonry are first studied. Subsequently, based on the acquired knowledge, the effect of some natural additives to the soil is investigated. Simple field tests, devised to identify the most adequate materials for adobe construction and to be easily transmitted to the potential adobe builder are finally proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472107
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  • 6
    Electronic Resource
    Electronic Resource
    Variability of chloroplast DNA and nuclear ribosomal DNA in cassava (Manihot esculenta Crantz) and its wild relatives (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 719-727 
    Details
    ISSN: 1432-2242
    Keywords: Cassava ; Wild Manihot species Chloroplast DNA ; Nuclear ribosomal DNA ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chloroplast DNA (cp) and nuclear ribosomal DNA (rDNA) variation was investigated in 45 accessions of cultivated and wild Manihot species. Ten independent mutations, 8 point mutations and 2 length mutations were identified, using eight restriction enzymes and 12 heterologous cpDNA probes from mungbean. Restriction fragment length polymorphism analysis defined nine distinct chloroplast types, three of which were found among the cultivated accessions and six among the wild species. Cladistic analysis of the cpDNA data using parsimony yielded a hypothetical phylogeny of lineages among the cpDNAs of cassava and its wild relatives that is congruent with morphological evolutionary differentiation in the genus. The results of our survey of cpDNA, together with rDNA restriction site change at the intergenic spacer region and rDNA repeat unit length variation (using rDNA cloned fragments from taro as probe), suggest that cassava might have arisen from the domestication of wild tuberous accessions of some Manihot species, followed by intensive selection. M. esculenta subspp flabellifolia is probably a wild progenitor. Introgressive hybridization with wild forms and pressures to adapt to the widely varying climates and topography in which cassava is found might have enhanced the crop's present day variability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223711
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of polytetrahydrofurane macromers by cationic deactivation (1982)
    Springer
    Polymer bulletin 7 (1982), S. 277-282 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256793
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  • 8
    Electronic Resource
    Electronic Resource
    Spontaneous para-Lorentzian conserved-vector and nonconserved-axial weak currents (1982)
    Springer
    Foundations of physics 12 (1982), S. 765-779 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy-momentum relationship is obtained in para-Lorentzian dynamics. It is shown that the well-known correspondence rule for the operators energy and momentum holds in any inertial system if it is assumed to hold in the preferred reference frame. The new Dirac equation is obtained. Some qualitative features of the new theory are given; one of then is the spontaneous appearance of conserved-vector and nonconserved-axial weak currents. Finally one evaluates the convenience of further developments of the present theory in view of the excellent agreement of QED with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731689
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  • 9
    Electronic Resource
    Electronic Resource
    Nonrelativistic para-Lorentzian mechanics (1981)
    Springer
    Foundations of physics 11 (1981), S. 235-278 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After reviewing the foundations of special relativity and the room left for rival theories, a set of nonrelativistic para-Lorentzian transformations is derived uniquely, based on (a) a weaker first principle, (b) the requirement that the transformations sought do not give rise to the clock “paradox” (in a refined version), and (c) the compliance of the transformations with the classical experiments of Michelson-Morley, Kennedy-Thorndike, and Ives-Stilwell. The corresponding dynamics is developed. Most of the experimental support of special relativity is reconsidered in the light of the new theory. It is concluded that the relativity of simultaneity has so far not been tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00726268
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  • 10
    Electronic Resource
    Electronic Resource
    Red deer (Cervus elaphus hispanicus) management in the dehesa system in Central Extremadura, Spain (1995)
    Springer
    Agroforestry systems 29 (1995), S. 77-89 
    Details
    ISSN: 1572-9680
    Keywords: antlers ; dehesa ; red deer (Cervus elaphus) ; Spain ; wildlife habitat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Resumen En el presente trabajo se estudia la dehesa como hábitat del ciervo (Cervus elaphus hispanicus). Se ha tomado como referencia una finca cerrada de 4300 ha de ST situada en la Sierra de San Pedro, en Extremadura, España. Se describen los sistemas de gestión actuales del ciervo en cuanto a hábitat, modo de explotación, alimentación, control de población y producción de bienes y servicios. Concluyendo con la necesidad de fomentar este tipo de explotaciones cinegéticas de dehesa que ayudan a conservar y potenciar el medio ambiente en zonas despobladas y deprimidas
    Notes: Abstract In this paper we report the results of a study on the suitability of the dehesa (Mediterranean woodlands) as habitat of red deer (Cervus elaphus hispanicus) in a closed country estate of about 4300 ha total surface situated in the San Pedro Mountain, in Central Extremadura, Spain. We have described the deer management with respect to habitat, exploitation mode, deer feeding, population control and production of goods and services. It is concluded that the dehesa system is a rich natural resource that preserves and improves the degraded environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711283
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