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  • 2005-2009  (69)
  • 1985-1989  (49)
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  • 1
    Series available for loan
    Series available for loan
    Geologie de la chaine de Nyimaling aux confins du Ladakh et du Rupshu (NW-Himalaya, Inde) : evolution paleogeographique et tectonique d´un segment de la marge nord-indienne (1988)
    Lausanne
    Associated volumes
    Details Availability
    Call number: SR 90.0059(3)
    In: Memoires de geologie (Lausanne)
    Type of Medium: Series available for loan
    Pages: 149 S.
    Series Statement: Memoires de geologie, Lausanne 3
    Language: French
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Photocurrent spectroscopy of InxGa1−xAs/GaAs multiple quantum wells (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2230-2232 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photocurrent spectra of InxGa1−xAs/GaAs multiple quantum well structures grown by molecular beam epitaxy are studied in the presence of electric fields perpendicular to the heterointerface. Several Δn=0 allowed and Δn≠0 forbidden excitonic transitions are observed. Both negative and positive shifts of exciton transitions are found. Good agreement is found between the photocurrent observations and calculations using a multiband effective-mass approach, taking into account the strain-induced splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101132
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  • 3
    Electronic Resource
    Electronic Resource
    Parametric study of AlAs/GaAs superlattice double-barrier diodes (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 207-209 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quantum well diodes with barriers formed by thin, short-period binary AlAs/GaAs superlattices were fabricated and found to have very high peak-to-valley current ratios. The effects of varying the AlAs and GaAs layers in the barriers are studied. The peak current density is found to decrease by orders of magnitude for monolayer increases in the AlAs layer thicknesses. Tunneling current peaks due to both resonance levels in the quantum well and resonance levels in the superlattice barriers are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100132
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of AlAs/GaAs superlattice barriers using electrical barrier height analysis (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4765-4767 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical barrier height measurements on n+-GaAs–insulator–n-GaAs structures with short-period AlAs/GaAs superlattices forming the insulator show the effective conduction-band discontinuity (ΔEC) of a superlattice barrier (SLB) to be defined by the lowest superlattice energy state. Five structures with different AlAs and GaAs SLB layer thicknesses are investigated. A SLB with GaAs layers greater than 10 monolayers is found to have a ΔEC defined by Γ-valley states in the GaAs layers, while a SLB with GaAs and AlAs layers less than 10 monolayers and with thicker AlAs layers than GaAs layers is found to have a ΔEC defined by X-valley states in the AlAs layers. The SLB with GaAs and AlAs layers less than 10 monolayers and thicker GaAs layers than AlAs layers behaves as a random alloy. Negative differential resistance is observed in the current-voltage characteristic of the sample whose barrier height is defined by Γ-valley states in the GaAs layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341194
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  • 5
    Electronic Resource
    Electronic Resource
    AlGaAs/GaAs double barrier diodes with high peak-to-valley current ratio (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 121-123 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the largest peak-to-valley current (PVC) ratios to date from AlGaAs/GaAs double barrier (either alloy barrier or superlattice barrier) diodes. PVC ratios as high as 3.6 and 21.7 were obtained from an AlAs/GaAs superlattice barrier structure at 300 and 77 K, respectively. In an alloy barrier structure with x=0.42 (x=0.3), PVC ratios of 3.9 (2.2) and 14.3 (7.0) were observed at 300 and 77 K, respectively. We attribute these excellent results to a "two-step'' spacer layer incorporated in the devices studied which facilitated the growth of high material quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98588
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  • 6
    Electronic Resource
    Electronic Resource
    Two-dimensional solid-solution formation of Y-containingα-Si3N4 (1986)
    Springer
    Journal of materials science 5 (1986), S. 335-336 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01748097
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  • 7
    Electronic Resource
    Electronic Resource
    The lower Paleozoic Nyimaling Granite in the Indian Himalaya (Ladakh): New Rb/Sr data versus zircon typology (1987)
    Springer
    International journal of earth sciences 76 (1987), S. 307-315 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract A granitic batholith in the Tso Morari Culmination of the most internal High Himalayan thrust sheets (Ladakh Himalaya, India) has been investigated by Rb/Sr isotopic methods as well as by typological studies on its zircon population (Pupin 1980). The good alignment and spread of the single muscovite and the 6 whole rock data points allow the tracing of a fairly good isochron of 460±8 Ma which may be considered as the granite's crystallisation age. Its Sr initial ratio (I.R.) of 0.7365±2 is very high even in respect to other anatectic granites of this suite known in the Himalayas and in continental blocks to the north. In terms of the lower Cambrian to middle Ordovician ages known for this granitic suite, the Nyimaling Granite is among the youngest. The zircon population perfectly confirms isotope data interpretation and field observations inasmuch as it is characteristic for aluminous, intrusive granites of crustal origin (cf. high Sr I.R.); moreover, the batholith is intrusive into Lower Cambrian metasediments affected by a marked contact metamorphism and a regional overprint of greenschist facies. Its crustal level is thus very high.
    Abstract: Résumé Le Granite de Nyimaling (Ladakh méridional, Inde) dans l'ouest de la Culmination du Tso Morari (zone des racines des nappes du Haut-Himalaya) a été l'objet d'une étude géochronologique Rb/Sr ainsi que d'une étude typologique des zircons. Nos résultats isotopiques permettent pour les 6 échantillons de roche totale et la muscovite, de tracer une isochrone de 460±8 Ma, considérée comme l'âge de cristallisation du granite. Le rapport initial du Sr de nos échantillons est très élevé (0,7365±2) et mÊme supérieur encore aux rapports initiaux déjà élevés des autres granites d'anatexie de cette génération connus dans la croûte gondwanienne dans et au nord de l'arc himalayen. Son âge est l'un des plus jeunes parmi ces granitoÏdes d'âge cambrien inférieur à ordovicien moyen. L'étude morphologique des zircons selonPupin (1980) confirme les données isotopiques et de terrain: la population ainsi définie est celle d'un granite alumineux intrusif d'origine crustale. Sur le terrain, le granite occupe une position intrusive très élevée dans des métasédiments du Cambrien inférieur affectés par un métamorphisme de contact et un métamorphisme régional de faciès schistes verts.
    Notes: Zusammenfassung Der Nyimaling-Granit im Westen der Tso Morari-Kulmination (internste Teile der High Himalaya-Decken; Ladakh Himalaya, Indien) wurde mit der Rb/Sr-Isotopenmethode untersucht; gleichzeitig konnte seine Zirkon-Population typologisch nachPupin (1980) bestimmt werden. Die eine Muskowitsowie die 6 Gesamtgesteinsproben reihen sich gut zu einer Isochrone von 460±8 Ma, deren Alter als Kristallisationsalter des Granits interpretiert werden darf. Das Initial-VerhÄltnis des Sr (0,7365±2) ist im Vergleich zu andern anatektischen Graniten dieser Generation in Gondwana-Krustenanteilen des Himalaya und nördlicherer Kontinentalblöcke sehr hoch. Ebenso ist er sehr jung; die bekannten Alter anderer GranitoÏde erstrecken sich vom unteren Kambrium ins mittlere Ordovizium. Die Zirkon-Population bestÄtigt die Interpretation der Isotopen-Daten sowie die Feldbeobachtungen: ihre Typologie ist charakteristisch für krustenanatektische, intrusive Granite. Der Nyimaling-Granit intrudiert unterkambrische Metasedimente, die eine Kontaktmetamorphose sowie eine regionale, alpidische metamorphe überprÄgung in Grünschiefer-Fazies zeigen. Er hÄlt somit eine relativ hohe Position innerhalb der Kruste inne.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01821076
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  • 8
    Electronic Resource
    Electronic Resource
    Euglena gracilis chloroplast DNA: analysis of a 1.6 kb intron of the psb C gene containing an open reading frame of 458 codons (1986)
    Springer
    Current genetics 11 (1986), S. 35-39 
    Details
    ISSN: 1432-0983
    Keywords: Euglena gracilis ; Chloroplast genome ; psb C ; Intron ORF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We retrieved a 1.6 kbp intron separating two exons of the psb C gene which codes for the 44 kDa reaction center protein of photosystem II. This intron is 3 to 4 times the size of all previously sequenced Euglena gracilis chloroplast introns. It contains an open reading frame of 458 codons potentially coding for a basic protein of 54 kDa of yet unknown function. The intron boundaries follow consensus sequences established for chloroplast introns related to class II and nuclear pre-mRNA introns. Its 3′-terminal segment has structural features similar to class II mitochondrial introns with an invariant base A as possible branch point for lariat formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389423
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  • 9
    Electronic Resource
    Electronic Resource
    The chloroplast genome of Euglena gracilis: the mosaic structure of a DNA segment linking the extra 16S rRNA gene with the rrn operon A (1985)
    Springer
    Current genetics 9 (1985), S. 221-227 
    Details
    ISSN: 1432-0983
    Keywords: Chloroplast DNA ; Euglena gracilis ; rrn operons ; DNA deletion/insertion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have completed the analysis of a DNA segment of the chloroplast genome of Euglena gracilis Klebs, Z-strain, which links the 3′ end of the extra 16S rRNA gene with the 5′ end of the 16S rRNA gene of the rrn operon A. This region is a mosaic of several structural elements and contains an intact rrn interoperon spacer of 1,080 bp, an extra 5S rRNA gene, an open reading frame for 406 codons (ORF 406) which is flanked by short inverted repeats and a short direct repeat originating from the rrn interoperon spacer. It seems that a once complete rrn operon underwent in the past an insertion/deletion event leaving intact the 16S and 5S rRNA but totally excising the 16S-23S intergenic spacer and the 23S rRNA gene. Instead a protein coding gene of yet unknown function was inserted along with other structural elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420315
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  • 10
    Electronic Resource
    Electronic Resource
    Discrimination of alfalfa weevil strains by allozyme analysis (1985)
    Springer
    Entomologia experimentalis et applicata 37 (1985), S. 113-121 
    Details
    ISSN: 1570-7458
    Keywords: Hypera postica ; alfalfa weevil ; allozyme analysis ; Coleoptera ; Curculionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les allozymes d'Hypera de l'est des USA (Beltsville, Maryland; Washington Co., Illinois), de l'ouest des USA (Logan et St Georges, Utah) et ‘égyptiens’ (Yuma, Arizona; Westmorland, Californie) ont été analysés par électrophorèse sur gel d'acrylamide. L'étude a porté sur 22 loci de 12 enzymes (ACPH, ADH, AMY, AO, EST, GOT, G-6PDH, MDH, ME, SOD, TYR, XDH). L'hétérozygotie moyenne de la population était 0.231, avec une moyenne de loci polymorphes de 0.536. La distance génétique moyenne de l'ensemble des populations était de 0.033 et l'indice de fixation de 0.024. Des loci caractéristiques ont été trouvés qui pourraient permettre de distinguer les Hypera occidentaux des orientaux et des ‘égyptiens’. La faible distance génétique entre les Hypera orientaux et ‘égyptiens’ suggère qu'ils appartiennent à la même souche et sont certainement différents des occidentaux. A partir de cela et d'autres éléments, nous concluons que tous les Hypera des USA sont H. postica Gyllenhal et que l'utilisation d'H. brunneipennis Boheman pour désigner les Hypera ‘égyptiens’ d'Amérique du Nord doit être abandonnée.
    Notes: Abstract Allozyme profiles of eastern weevils (Beltsville, Maryland; Washington Co., Illinois), western weevils (Logan and St. George, Utah), and Egyptian weevils (Yuma, Arizona; Westmorland, California) were compiled by acrylamide gel electrophoresis. Twenty-two gene loci from 12 enzymes (ACPH, ADH, AMY, AO, EST, GOT, G-6PDH, MDH, ME, SOD, TYR, XDH) were analyzed. Mean heterozygosity of these populations was 0.231, with an average proportion of polymorphic loci of 0.536. The mean genetic distance of all weevil populations was 0.033 and the fixation index was 0.024. Diagnostic loci were found which could distinguish western weevils from eastern and Egyptian weevils. The small genetic distance between the eastern and Egyptian weevils suggests that they may be the same strain and are certainly different from the western weevil strain. Based on this and other evidence, we conclude that all weevil strains in the United States are Hypera postica (Gyllenhal), and that the use of H. brunneipennis (Boheman) for the Egyptian alfalfa weevil of North America should be discontinued.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188198
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