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  • Articles  (21)
  • Other Sources
  • Springer  (15)
  • Institute of Physics  (6)
  • AGU (American Geophysical Union)
  • 2015-2019
  • 1990-1994  (21)
  • 1985-1989
  • 1991  (21)
  • Biology  (12)
  • Physics  (8)
  • Electrical Engineering, Measurement and Control Technology  (2)
  • Architecture, Civil Engineering, Surveying
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  • Articles  (21)
  • Other Sources
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  • 2015-2019
  • 1990-1994  (21)
  • 1985-1989
Year
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  • 1
    Electronic Resource
    Electronic Resource
    Mating behavior and male mating success in wildAnastrepha Ludens (Diptera: Tephritidae) on a field-caged host tree (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 471-487 
    Details
    ISSN: 1572-8889
    Keywords: mating behavior ; courtship ; lek ; mating system ; Mexican fruit fly ; Anastrepha ludens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mating behavior and factors affecting mating success of males were studied using wild Anastrepha ludens on a fieldcaged host tree. The most common courtship sequence had five components: (1) male calls from the underside of a leaf, (2) female arrives to the maleoccupied leaf, (3) male orients to female and stops calling, (4) one or both approach to a face-to-face position 1–3 cm apart, and (5) male mounts female after 1–2 s. Courtship behavior was almost identical to that of laboratoryculture flies observed previously under laboratory conditions. Most malefemale encounters occurred at a height of 1–2m, well inside the outer canopy of the tree. Differential mating success by males occurred. No male mated more than once per day, owing possibly to a very short sexual activity period. Factors favoring mating success of males were survival ability and tendency to join male aggregations and to fight other males. Thorax length and age (9–11 days difference) had no effects on male copulatory success. Overall win/loss percentage was not related to mating success because the males that were most successful at mating fought mostly among themselves, driving their win/loss percentage down. However, these successful males (at mating) won most of their fights against less successful males. Results confirmed a lek mating system: males aggregated, called, and defended territories; territories did not contain femalerequired resources; and females exercised mate choice, apparently through selection of sites within leks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049332
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  • 2
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    Two planetary nebulae in the direction of the Galactic center (1991)
    Institute of Physics
    Details
    Publication Date: 1991-12-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Analytical differentiation of wine fermentations using pure and mixed yeast cultures (1991)
    Springer
    Journal of industrial microbiology and biotechnology 7 (1991), S. 181-189 
    Details
    ISSN: 1476-5535
    Keywords: Saccharomyces cerevisiae ; Torulaspora delbrueckii ; Aroma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Thirty-three fermentations of Pedro Ximénez grapes, collected in three degrees of ripeness, were carried out by inoculation with three types of inoculum: pure cultures ofSaccharomyces cerevisiae races and ofTorulaspora delbrueckii, indigenous yeasts, and mixed cultures of indigenous yeasts enriched with the pure cultures. By means of variance analysis 21 compounds were determined whose final concentrations in the wines significantly depended on the musts, the inocula or both. Eleven products that depended significantly on the inocula were subjected to a discriminant analysis in which most of the pure cultures gathered in a discriminant space area different from that occupied by the indigenous yeasts. The centroids corresponding to most of the mixed cultures were shifted to the central area of the discriminant space, moved away from their corresponding pure cultures and approached the indigenous yeasts. The results show a high similarity between the fermentations carried out with mixed cultures with the addedS. cerevisiae races and those fermentations carried out with the indigenous yeasts, with regard to those compounds which were significantly dependent on the inocula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575881
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  • 4
    Electronic Resource
    Electronic Resource
    Transformation of sterigmatocystin and O-methylsterigmatocystin by aflatoxigenic and nonaflatoxigenic field isolates of the Aspergillus flavus group (1991)
    Springer
    Mycopathologia 116 (1991), S. 71-75 
    Details
    ISSN: 1573-0832
    Keywords: Transformation ; sterigmatocystin ; O-methylsterigmatocistin ; A. flavus ; field isolates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Transformation of sterigmatocystin and O-methylsterigmatocystin (two metabolic aflatoxin precursors) to aflatoxins by aflatoxigenic and nonaflatoxigenic field isolates of Aspergillus flavus was studied. The 24 nonaflatoxigenic isolates investigated failed to transform both precursors. Among the 8 aflatoxin-producing isolates used, 7 transformed both precursors whereas the remaining failed to transform both. According to these results, the usefulness of the measurement of enzymatic activities related to aflatoxin production in understanding the true status of conflictive field isolates is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00436367
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  • 5
    Electronic Resource
    Electronic Resource
    Isolation and ultrastructural characterization of the residual nuclear matrix in a plant cell system (1991)
    Springer
    Chromosoma 100 (1991), S. 110-117 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We isolated the nuclear matrix of proliferative meristematic root cells of Allium cepa bulbs and characterized it ultrastructurally and by one-dimensional SDS-polyacrylamide gel electrophoresis. The general organization of the nuclear matrix in onion root cells is similar to that found in other eukaryotes extracted under the same conditions. There are three main morphological components: the residual pore-lamina complex, the internal matrix and the residual nucleolus. The matrix has a fibrillo-granular structure composed of 5–10 nm fibrils and 20–25 nm granules. The residual protein matrix has a complex pattern, with several polypeptide bands of 12000 to 70000 Mr. The major bands have Mrs of 62000, 56000, 35000 and 27000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418244
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  • 6
    Electronic Resource
    Electronic Resource
    The ΔF508 mutation and RFLP-linked loci in Spanish cystic fibrosis families (1991)
    Springer
    Human genetics 〈Berlin〉 87 (1991), S. 516-517 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197182
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  • 7
    Electronic Resource
    Electronic Resource
    Fire intensity and herbivory effects on postfire resprouting of Adenostoma fasciculatum in southern California chaparral (1991)
    Springer
    Oecologia 85 (1991), S. 429-433 
    Details
    ISSN: 1432-1939
    Keywords: Adenostoma fasciculatum ; California chaparral ; Fire intensity ; Herbivory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Resprouting is the main regeneration mechanism after fire in Mediterranean-type ecosystems. Herbivores play an important role in controlling postfire seedling establishment, but their influence on regeneration by resprouting is less well known. To study the effects of fire intensity on resprouting of Adenostoma fasciculatum in southern California chaparral, and its interaction with herbivory, we conducted an experimental burn at three levels of fire intensity. We found that increasing fire intensity increased plant mortality, reduced the number of resprouts per plant, and delayed the time of resprouting. Herbivory increased with fire intensity, and was related to the time of resprouting. Plants resprouting later in the season and out of synchrony with the main flush were attacked more readily by herbivores. Post-resprouting mortality also increased with fire intensity and was significantly associated with herbivory in the higher fire intensity plots. Fire intensity effects on chaparral regeneration by resprouting may be farreaching through effects on the population structure, resprout production, and growth of Adenostoma fasciculatum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00320621
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  • 8
    Electronic Resource
    Electronic Resource
    Seed set after pollination with in-vitro-matured, isolated pollen of Triticum aestivum (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 576-580 
    Details
    ISSN: 1432-2242
    Keywords: Pollen culture ; Pollen maturation ; Pollination ; Triticum aestivum ; Gliadins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Immature pollen of two varieties of Triticum aestivum, at the stage right after the first pollen mitosis, was isolated from individual anthers and cultured in microcultures of microliter droplets. In a specifically designed medium, some of the pollen grains developed to maturity. These were applied to excised stigmas on agar, where they produced pollen tubes. Application to flowers in vivo led to seed set. Pollen was matured in vitro from a variety that produced a different protein banding pattern on SDS-PAGE as compared to the variety that was pollinated. The protein banding in the produced seeds showed the hybrid pattern, demonstrating that the seeds were not produced by self-pollination in this in-breeding species but by pollination with the in-vitro-matured pollen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226721
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  • 9
    Electronic Resource
    Electronic Resource
    Efficient expression of a Trypanosoma cruzi antigen in Escherichia coli and Staphylococcus aureus and its rapid purification (1991)
    Springer
    World journal of microbiology and biotechnology 7 (1991), S. 316-323 
    Details
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A Trypanosoma cruzi antigen gene was closed into a fusion vector based on the IgG binding domain of Staphylococcus aureus protein A. This vector transformed into Escherichia coli or Staphylococcus aureus and produced about 12 mg fusion protein/l culture. In E. coli, the product remained intracellular while in S. aureus it was excreted into the growth medium. The hybrid protein was purified by IgG Sepharose affinity chromatography. The presence of a cleavage site for enterokinase between protein A and the T. cruzi antigen in the fusion protein allowed the efficient release of the unfused antigen by enzymatic treatment. Further affinity chromatography through IgG Sepharose resulted in the production of the T. cruzi antigen free of protein A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329397
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  • 10
    Electronic Resource
    Electronic Resource
    Linear pseudosystolic array for partitioned matrix algorithms (1991)
    Springer
    The journal of VLSI signal processing systems for signal, image, and video technology 3 (1991), S. 201-214 
    Details
    ISSN: 1573-109X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We describe a class-specific linear pseudosystolic array, withK processing elements, suitable for partitioned execution of matrix algorithms. This array achieves high efficiency, exploits pipelining within cells in a simple manner, has off-cells communication rate lower than computation rate, a small storage inside each cell (whose size is independent of the size of problems), and external storage. This array has been derived from the application of the multimesh graph (MMG) method to a large class of matrix algorithms. Processing elements (cells) use the decoupled access/execute model of computation, which requires two programs in each cell: one controlling the execution of operations and the other the data transfers. All storage modules in the array are accessed as FIFO queues, without the need for addressing mechanisms. We describe the proposed instruction set, which includes single-instruction loops with no overhead, and block-loops with just one extra instruction. Moreover, cells can nest up to three loops with no added overhead. These features are needed for mapping algorithms with the MMG method. Mapping onto this array is illustrated using the LU-decomposition algorithm, and results obtained with other algorithms are also given. Estimates of performance indicate that it is possible to achieve over 85% efficiency, with low requirements in communication bandwidth and storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00925831
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