Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 33 (1961), S. 317-318 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 27 (1980), S. 265-275 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume La convergence évolutive deZacryptocerus varians et deCamponotus (Colobopsis) sp. est manifeste dans trois domaines: 1-une convergence de structures (ouvrières major dont la tête est structurée pour la défense; grands œufs); 2-une convergence de structure comportementale (taux élevé de trophallaxies orales; échanges de boulettes infra-buccales); 3-une convergence de répertoire comportemental (nombre d'items comportementaux en commun; distance comportementale). Les méthodes d'analyse de convergence du répertoire comportemental, qui utilisent des techniques dérivées de la taxonomie numérique, peuvent être particulièrement utiles pour obtenir des mesures quantitatives des effets relatifs de la phylogenèse et de l'écologie dans le comportement social des insectes. Par contraste avec la convergence comportementale des ouvrières minor, les ouvrières major ne présentent pas cette convergence. Les ouvrières major deColobopsis n'ont pas un comportement aussi spécialisé que les ouvrières major deZ. varians et sont relativement plus nombreuses, conformément à la théorie ergonomique habituelle. Nous nous sommes efforcés de rendre compte des convergences et divergences dans les aspects de la sociobiologie des deux espèces.
    Notes: Summary The convergence ofZacryptocerus varians andCamponotus (Colobopsis) sp. is manifest in three ways: i) Structural convergence (shield-headed major workers, large eggs), ii) Qualitative behavioral convergence (high rate of oral trophallaxis, traffic in infrabuccal pellets, iii) Repertoire convergence (number of behavioral categories in common, behavioral distance). Methods of analyzing repertoire convergence using techniques borrowed from numerical taxonomy may be especially useful in obtaining quantitative measurements of the relative effects of phylogeny and ecology in social insect behavior. In constrast to the behavioral convergence of the minor workers, the major workers do not show this convergence. The major workers ofColobopsis are not as behaviorally specialized as the major workers ofZ. varians and in accordance with current ergonomic theory are relatively more numerous. An effort is made to account for the areas of convergence and divergence in features of their sociobiology.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 31 (1984), S. 403-407 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume La composition des colonies deLeptothorax allardycei (Mann) est étudiée. L'importance numérique du couvain augmente linéairement avec le nombre d'ouvrières dans la colonie. Il n'y a pas de preuve d'un “reproductivity effect” chez cette espèce. Le rendement des colonies reste constant malgré l'augmentation de la population. Les conséquences pour la croissance de la colonie sont brièvement analysées.
    Notes: Summary The composition of colonies ofLeptothorax allardycei (Mann) is examined. The number of total brood increases linearly with the number of workers in the colony. There is no evidence of the reproductivity effect inL. allardycei. The relative efficiency of colonies remains constant with increases in colony size. The implications for colony size are briefly discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 35 (1988), S. 198-205 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume On étudie le modèle spatial de l'escalade de l'agression chez la FourmiLeptothorax allardycei. 973 interactions agressives furent observées, puis classées en fonction du niveau d'agression et en rapport avec les types de couvain présent. L'agression est plus probable en présence du couvain qu'en l'absence de celui-ci, et une escalade de l'agression se montre encore plus probable en présence des œufs. Un schéma présente l'enchaînement des décisions impliquées dans le commencement de l'agression et dans son escalade consécutive.
    Notes: Summary The spatial pattern of escalated aggression is examined in the antLeptothorax allardycei. A total of 973 aggressive interactions were observed, categorized according to the level of aggression achieved and the type of nearby brood. Aggression is more likely to occur in the presence of brood, and escalated aggression is most likely to occur in the presence of the eggs. A model for the decision involved in the initiation of aggression and its subsequent escalation is presented.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 41 (1994), S. 401-410 
    ISSN: 1420-9098
    Keywords: Nest structure ; temperature ; brood movement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure and thermal environment produced by the nest cones of the western harvester ant,Pogonomyrmex occidentalis, are investigated. The nest cone is oriented so that the longest slope faces towards the southeast ad the nest entrance faces the southeast. The temperature of the soil was monitored at thirty-six locations within the nest in order to measure the daily temperature change as a function of depth, aspect and radial distance from the center of peak of the cone. The occupancy of the nest cone by workers and by brood was assessed by core samples taken at different times of day in different portions of the cone. The brood are only present during the midmorning sample and are present in greatest numbers on the eastern side of the cone. The adult workers are present in the cone in highest numbers during the midmorning, virtually absent from the cone during mid-afternoon and returning in smaller numbers at dusk, apparently spending the night near the surface on the eastern side of the mound. The eastern and southern portions of the cone are occupied most frequently while the western side of the cone is nearly vacant. The nest cone is an adaptation which magnifies the amplitude of daily temperature fluctation. By moving to appropriate areas of the nest cone, the ants can take advantage of the increased range of temperature.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 113 (1992), S. 219-225 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A flume system and protocol for measuring the filtration rate of infaunal bivalves is described. Assemblages of multi-sized clams, at natural densities and in normal filter-feeding positions, removed phytoplankton suspended in a unidirectional flow of water. The free-stream velocity and friction velocity of the flow, and bottom roughness height were similar to those in natural estuarine waters. Continuous variations in phytoplankton (Chroomonas salinay) cell density were used to measure the filtration rate of the suspension-feeding clam Potamocorbula amurensis for periods of 2 to 28 h. Filtration rates of P. amurensis varied from 100 to 580 liters (gd)-1 over a free-stream velocity range of 9 to 25 cm s-1. Phytoplankton loss rates were usually constant throughout the experiments. Our results suggest that suspension-feeding by infaunal bivalves is sensitive to flow velocity.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Postharvest Biology and Technology 4 (1994), S. 135-146 
    ISSN: 0925-5214
    Keywords: Anaerobic volatile ; Controlled atmosphere ; Nectarine ; Peach ; Prunus persica
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1217-1219 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the successful growth of ZnTe on nearly lattice-matched III-V buffer layers of InAs (0.75%), GaSb (0.15%), and on GaAs and ZnTe by molecular beam epitaxy. In situ reflection high-energy electron diffraction measurements showed the characteristic streak patterns indicative of two-dimensional growth. Photoluminescence measurements on these films show strong and sharp features near the band edge with no detectable luminescence at longer wavelengths. The integrated photoluminescence intensity from the ZnTe layers increased with better lattice match to the buffer layer. The ZnTe epilayers grown on high-purity ZnTe substrates exhibited stronger luminescence than the substrates. We observe narrow luminescence linewidths (full width at half maximum ≈1–2 A(ring)) indicative of uniform high quality growth. Secondary-ion mass spectroscopy and electron microprobe measurements, however, reveal substantial outdiffusion of Ga and In for growths on the III-V buffer layers.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 868-868 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We became acutely aware of these problems when PPLO were isolated from a strain of hamster kidney cells (BHK 21 013)2 in use in this laboratory. Two factors led us to believe that infection was intracellular. PPLO could rarely be isolated from the supernatant medium from cell cultures grown in the ...
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...