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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 570-573 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 9305-9308 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 255-257 (Sept. 1997), p. 608-610 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary A study of the ant population in a sector of the Sierra Morena (South Spain) has been made. The objective of this work is to study the influence that a biotic factor (vegetation) and an abiotic one (exposure) may have on the distribution of these species. In order to carry out these experiments a stratified sampling in the main existing combinations between the vegetation units and their exposure was made. The analysis of the correspondances has made it possible to distinguish the indicative species of the main kinds of vegetation of the studied area (pasture, pine plantation and zone exposed to flooding). Through the analysis of the data, when the samples of the zone exposed to flooding are excluded, it is possible to distinguish the indicative species of areas where the bushwood or the pasture are dominant, as well as the ones indicative of areas with different exposure. It is not possible to distinguish indicative species of the previously established sectors in the repopulated zone. This could be interpreted as a consequence of the homogeneization due to human management.
    Abstract: Resumen Se ha realizado un estudio de las poblaciones de hormigas de un sector de Sierra Morena central (Sur de España). El trabajo tiene como objetivo estudiar la influencia que un factor de tipo abiótico (exposición) y otro biótico (vegetacion) tienen sobre la distribución de estas especies. Para ello se ha realizado un muestreo estratificado en las principales combinaciones existentes entre las unidades de vegetación presentes en la zona de estutio y su exposición. El análisis de correspondencias ha permitido, en primer lugar, separar las especies indicadoras de los principales tipos de vegetación de la zona (pastizal, repoblación de pinos y zona inundable del río). En el análisis efectuado, cuando se suprimen los inventarios de la zona inundable, se pueden distinguir las especies indicadoras de zonas donde predomina el matorral, ó el pasto herbáceo, así como las que son indicadoras de zonas con exposición a solana ó umbría. Dentro de la zona repoblada no es posible distinguir especies indicadoras de los sectores previamente establecidos, lo que puede interpretarse como una consecuencia de la homogeneización debida al manejo humano.
    Notes: Resume Le but de ce travail est d'étudier l'influence d'un facteur biotique (la végétation) et d'un facteur abiotique (l'exposition) sur la distribution des espèces de fourmis dans une zone de la Sierra Morena Centrale (Sud de l'Espagne). Pour cela, on a réalisé des échantillonnages stratifiés dans chaque unité de végétation, en soulane et en ombrée. L'analyse des correspondances a permis d'abord de séparer les espèces trouvées dans les principaux types de végétation de la zone d'étude (pâturage, reboisement de pins et zone inondée le long d'une rivière). Quand on supprime les relevés des endroits inondables, on peut distinguer les espèces indicatrices des zone où prédominent soit le maquis («matorral») soit le pâturage («dehesa»), ainis que celles des zones exposées en soulane ou en ombrée. Dans la zone reboisée, il est impossible de distinguer des espèces indicatrices des associations végétales caractéristiques du milieu, ce qui peut s'interpréter comme une conséquence de l'homogénéisation due aux pratiques culturales.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Annales geophysicae 16 (1998), S. 1445-1454 
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We present some results of the analytical integration of the energy rate balance equation, assuming that the input energy rate is proportional to the azimuthal interplanetary electric field, Ey, and can be described by simple rectangular or triangular functions, as approximations to the frequently observed shapes of Ey, especially during the passage of magnetic clouds. The input function is also parametrized by a reconnection-transfer efficiency factor α (which is assumed to vary between 0.1 and 1). Our aim is to solve the balance equation and derive values for the decay parameter τ compatible with the observed Dst peak values. To facilitate the analytical integration we assume a constant value for τ through the main phase of the storm. The model is tested for two isolated and well-monitored intense storms. For these storms the analytical results are compared to those obtained by the numerical integration of the balance equation, based on the interplanetary data collected by the ISEE-3 satellite, with the τ values parametrized close to those obtained by the analytical study. From the best fit between this numerical integration and the observed Dst the most appropriate values of τ are then determined. Although we specifically focus on the main phase of the storms, this numerical integration has been also extended to the recovery phase by an independent adjust. The results of the best fit for the recovery phase show that the values of τ may differ drastically from those corresponding to the main phase. The values of the decay parameter for the main phase of each event, τm, are found to be very sensitive to the adopted efficiency factor, α, decreasing as this factor increases. For the recovery phase, which is characterized by very low values of the power input, the response function becomes almost independent of the value of α and the resulting values for the decay time parameter, τr, do not vary greatly as α varies. As a consequence, the relative values of τ between the main and the recovery phase, τm/τr, can be greater or smaller than one as α varies from 0.1 to 1.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0428
    Keywords: Key words IDDM, MHC, tumour necrosis factor alpha, polymorphism.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Insulin-dependent diabetes mellitus (IDDM) is associated with class II molecules of the MHC on chromosome 6, in particular HLA-DR and -DQ alleles, but a pathogenic role for TNF-α in the class III region of the MHC has also been implied. We therefore tested whether there was any independent association between a biallelic TNF polymorphism and IDDM. The TNF2 allele was present in 61 of 114 (54 %) IDDM patients compared to 101 of 253 (40 %) control subjects (odds ratio 1.73; p〈0.02). Stratification analysis in individuals matched for HLA-DR3 revealed, however, that this association was not independent of HLA-DR3 and is most likely to be a result of linkage disequilibrium between these alleles. [Diabetologia (1994) 37: 500–503]
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 169 (1984), S. 167-176 
    ISSN: 1432-0568
    Keywords: Cerebellum ; Cerebellar afferents ; Cerebellar efferents ; Inferior olive ; Xenopus laevis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the present study the cerebellar afferents in the clawed toad Xenopus laevis have been analysed with the horseradish peroxidase (HRP) technique. In addition, data on the efferent connections of the cerebellum could be gathered, based on the phenomenon of anterograde transport of HRP. Cerebellar afferents in Xenopus laevis appear to arise mainly in the vestibular nuclear complex, in a primordial inferior olive and in the spinal cord. Both primary (arising in the ipsilateral vestibular ganglion) and secondary vestibulocerebellar projections were found. A distinct crossed olivocerebellar projection to the molecular layer of the cerebellum was found. Two spinocerebellar pathways are present in Xenopus laevis, as in other anurans, viz. an ipsilateral dorsal spinocerebellar tract, presumably arising in dorsal root ganglion cells, and a larger ventral pathway, bilaterally arising in the spinal gray matter. The latter tract mainly originates in the ventrolateral and ventromedial spinal fields. Furthermore, a secondary trigeminocerebellar projection arising in the descending trigeminal nucleus, a cerebellar projection arising in the dorsal column nucleus, a small projection arising in a possible primordium of the mammalian nucleus prepositus hypoglossi, a raphecerebellar projection, and a small cerebellar projection originating in the ipsilateral mesencephalic tegmentum were demonstrated. Cerebellar efferents in Xenopus laevis are mainly aimed at the vestibular nuclear complex. A distinct ipsilateral cerebellovestibular projection present throughout the vestibular nuclear complex presumably arises in Purkyně cells, a smaller contralateral projection in the cerebellar nucleus. In addition, a small primordial brachium conjunctivum, projecting to the red nucleus, was noted. The basic pattern of cerebellar connections as suggested for terrestrial vertebrates (ten Donkelaar and Bangma 1984) is also found in the permanently aquatic anuran Xenopus laevis.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-072X
    Keywords: Key words Laccase ; Coriolopsis gallica ; Decolorization ; Alkali lignin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The basidiomycete Coriolopsis gallica decolorizes alkaline paper effluents efficiently. In this work, we found that C. gallica produces laccase during this decolorization process. This enzymatic activity was produced in all media studied; however, the highest enzymatic activity was obtained in a medium containing paper effluent, where laccase was detected on the 2nd day of the experiment. The laccase activity of C. gallica was purified and characterized. The amino-terminal sequence of this protein showed the highest similarity with the laccase I of the basidiomycete PM1 and with Coriolus hirsutus laccase.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 139 (1997), S. 442-445 
    ISSN: 0942-0940
    Keywords: Gamma knife ; radionecrosis ; spacial misregistrations ; posteroventral pallidotomy ; thalamotomy ; physiologic target ; localization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report a case of gamma knife pallidotomy resulting in a permanent contralateral homonymous hemianopsia and transient contralateral hemiparesis with some improvement in contralateral parkinsonian symptoms. This case illustrates the risk of gamma knife pallidotomy which precludes physiologic target localization and can subject structures surrounding the target to a significant radiosurgical dose. Until noninvasive physiologic target localization is available gamma knife pallidotomy and thalamotomy should be limited to patients with an unacceptably high risk for stereotactic percutaneous thermocoagulation.
    Type of Medium: Electronic Resource
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