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  • 1
    Electronic Resource
    Electronic Resource
    Sequential co-operative load transport in the seed-harvesting ant Messor barbarus (1999)
    Springer
    Insectes sociaux 46 (1999), S. 119-125 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Granivorous ants, foraging, cooperation, seed mass, Messor barbarus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: A mechanism for co-operative load transport was detected in the seed-harvesting ant Messor barbarus. Workers co-operated sequentially, transferring the load from one to another and thus forming what might be termed a transport chain. Although most of the colony's workers could have transported loads unaided, co-operation was prompted by the appearance of high loading ratios in the vicinity of the food source. The first worker in such a chain tended to be small or medium-sized, with a high loading ratio, while the last was larger, and had a correspondingly lower loading ratio. This strategy was of major benefit to the colony, in that it considerably reduced the time required for transport to the nest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050121
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptability of foraging trails inMessor barbarus (1986)
    Springer
    Insectes sociaux 33 (1986), S. 249-257 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Le but de cette étude est de montrer la capacité d'adaptation de l'espèceM. barbarus face aux nouvelles conditions du système de pistes suite aux changements produits dans l'environnement par le feu. On constate que les pistes établies après le feu sont très différentes de celles existant auparavant. Tous les nids ne reconstruisent pas de pistes après le feu car certains d'entre eux réutilisent les précédentes. Il existerait un rapport entre la largeur moyenne de la piste et la densité de la végétation, ainsi qu'avec l'augmentation de la linéarité et la longueur des pistes après le feu.
    Notes: Summary This paper studies the ability of the speciesMessor barbarus to adapt to new trail system conditions, with particular reference to the extreme changes in the environment caused by fire. It was observed that trails established after the fire differed significantly from those used by the colony previously. Not all nest established new trails after the fire, since some re-used former trails. Similarly, a close relationship was observed between average trail width and density of vegetation, together with an increase in linearity and length of trails after the fire.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224244
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  • 3
    Electronic Resource
    Electronic Resource
    The nature of the voltage-dependent conductance of the hemocyanin channel (1975)
    Springer
    The journal of membrane biology 25 (1975), S. 163-181 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The electrical responses of individual hemocyanin channels in oxidized cholesterol membranes demonstrate that the voltage-dependent conductance of many-channel membranes arises from two different mechanisms. These are the voltage-dependent redistribution of channels among several discrete single-channel conductance states and the continuously voltage-dependent conductance of the single-channel states themselves. The relaxation time for the discrete conductance changes is of the order of seconds and the relaxation time of the continuous conductance changes is of the order 10−4 seconds. As salt concentration in the bathing medium is increased, the single-channel conductance first increases linearly and then saturates. The characteristics of the saturation curves suggest that the continuous conductance changes occur at the edges of the channel and that the mean time an ion spends in the channel is 4 nanoseconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868573
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration-Dependent Photoluminescence and Raman of p-Type GaAs Grown in a Metallic-Arsenic-Based-MOCVD System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 587-588 (June 2008), p. 283-287 
    Details
    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
    Notes: This work presents the optical and structural characterization of p-type GaAs epilayers.The gallium precursor was the organometallic compound trimethylgallium (TMG). The influence ofthe doping in the optical and structural properties of the GaAs layers has been studied byphotoluminescence (PL) and Raman dispersion measurements. The range of analyzed holeconcentration was from 1017 to 1019 cm-3 as measured by the Hall-van der Pauw method. Forcarrying out doping p-type, it was necessary to modify the hydrogen activity in the growthatmosphere with the control of a H2+N2 mixture, which was used like transporting gas. Thephotoluminescence response and Raman dispersion of the layers are strongly dependence of thegrowth temperature, which were investigated based on the hole concentration. The PL response ofthe layers shows two radiative transitions, band-to-band and band-to-C-acceptor at low holeconcentration and disappears at high concentrations. Raman scattering spectra show LO mode at270 cm-1 for low doped samples and a LO-like mode at 290 cm-1 produced by the phonon-holeplasmoncoupling for high doped samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.283.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Amiloride fluxes across erythrocyte membranes
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 734 (1983), S. 99-104 
    Details
    ISSN: 0005-2736
    Keywords: (Human blood) ; Amiloride flux ; Erythrocyte membrane ; Na^+ transport
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(83)90080-9
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  • 6
    Electronic Resource
    Electronic Resource
    Membrane actions of male contraceptive gossypol tautomers
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 863 (1986), S. 101-109 
    Details
    ISSN: 0005-2736
    Keywords: Gossypol tautomer ; Membrane interaction ; Membrane potential ; Oxidative phosphorylation ; Phosphorylation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(86)90391-3
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis, reactivity and crystal structure of [Rh(C"6H"5Me){P(OPh)"3}"2]ClO"4
    Amsterdam : Elsevier
    Inorganica Chimica Acta 42 (1980), S. 75-84 
    Details
    ISSN: 0020-1693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0020-1693(00)88889-1
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  • 8
    Electronic Resource
    Electronic Resource
    Enhanced urinary spontaneous luminescence in duchenne muscular dystrophy
    Amsterdam : Elsevier
    Free Radical Biology and Medicine 16 (1994), S. 851-853 
    Details
    ISSN: 0891-5849
    Keywords: Duchenne muscular dystrophy ; Free radicals ; Oxidative stress ; Urinary luminescence
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0891-5849(94)90203-8
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  • 9
    Electronic Resource
    Electronic Resource
    Model for the electrorheological effect in flowing polymeric nematics (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 8197-8204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An analytical model to study the response of a polymeric nematic confined in a rectangular cell, to a dc electric field is presented. The effect of a pressure-driven plane Poiseuille flow and its competition with the electric field is explicitly considered. For the final stationary state where the induced reorientation of the director has already occurred, an aligned structure with a greatly enhanced viscosity (electrorheological effect) is produced. For this same state the first normal stress difference is calculated as a function of position and of the applied field. For this quantity, regions of negative and positive values develop along the direction of the velocity gradient and an increase in the electric field or the flow causes an augmented effect in its profiles. The net force between the plates is also calculated. As the Reynolds number increases, it is found that it also changes sign from positive to negative, and the effect is more pronounced as the strength of the electric field increases. Finally, the paper is closed by discussing the scope and limitations of the model and methods employed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478721
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  • 10
    Electronic Resource
    Electronic Resource
    Indium phosphide vapor phase epitaxy at high growth rates, growth kinetics, and characterization (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 1572-1578 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: InP epitaxial layers have been grown at high growth rates by vapor phase reactive transport. A systematic study of the influence of growth conditions on the growth rate, surface morphology, and photoluminescence properties of the grown materials has been performed. The results show that the growth rate can be controlled at least between 0.3 and 75 μm per hour, the latter being over 75 times of the growth rate obtained with the usual techniques. The changes of the surface morphology of the layers with the growth conditions have been understood and layers having mirror-like surfaces can be grown for any growth rate. The mass transport mechanism occurs through three chemical reactions whose activation energies have been determined and a reliable model for the growth rate as a function of the growth conditions is now available. Double diffraction x-ray measurements demonstrate that the layers are characterized by a peak whose width at half maximum is 18 arcsec, even for the highest growth rates. Low temperature luminescence exhibits transitions involving free and bound excitons, and shallow donors and acceptors. C and Zn are identified as the only residual acceptors and no radiative deep levels are detected. Depending on the growth conditions, C or Zn are incorporated preferentially as the dominant acceptor. The intensity ratio of the excitonic transition to the transition involving Zn as acceptor varies exponentially with the growth temperature. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368225
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