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  • 1
    Electronic Resource
    Electronic Resource
    Complex burrows of the mud shrimp Callianassa truncata and their geochemical impact in the sea bed (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 619-622 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An interesting underwater landscape created by the mud shrimp, Callianassa truncata, was found in a shallow bay off the coast of the Italian island, Giglio, in the Mediterranean Sea (Fig. 1). Conspicuous mounds and funnels covered the sea bed at an average density of 120 mounds per square metre ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/382619a0
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  • 2
    Electronic Resource
    Electronic Resource
    Visual evoked potentials as an aid in evaluating brain dysfunction following concussional injury: An animal model (1980)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 215 (1980), S. 105-111 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Visuell evozierte Potentiale wurden in dichter Folge vor und nach Kopfbeschleunigungen an Kaninchen über dauernd epidural implantierte Elektroden abgeleitet. Die Amplitude des nach der Läsion abgeleiteten VEPs war vermindert und die Erholungszeit verlängert. Beide Schädigungsfolgen waren umso ausgeprägter, je stärker die Beschleunigung und je deutlicher die später histologisch erfaßbaren Hirnveränderungen waren. In der Erwartung, daß das VEP bei Patienten mit Schädel-Hirnverletzungen wichtige Hinweise auf die Schwere der Verletzung und somit für die Behandlung liefern kann, waren diese Untersuchungen notwendig, um geeignete Untersuchungsmethoden und grundlegende Parameter zu finden.
    Notes: Abstract Visual evoked potentials were recorded sequentially, using permanent epidurally implanted electrodes, before and after accelerating the heads of rabbits. The amplitude of VEP, recorded after lesioning, was diminished and recovery time was prolonged depending on the amount of acceleration and the extent of brain lesions found later in histological examinations. VEP reflected damage to the brain more precisely than EEG or somatosensory evoked potentials, thus giving values for judging the extent of lesions in patients with brain injuries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414468
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  • 3
    Electronic Resource
    Electronic Resource
    Mitochondrial DNA variation in geographic populations of Colorado potato beetle,Leptinotarsa decemlineata (Coleoptera; Chrysomelidae) (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 483-485 
    Details
    ISSN: 1420-9071
    Keywords: Mitochondrial DNA ; RFLP ; Leptinotarsa decemlineata ; Colorado potato beetle ; population genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This study demonstrates variability in restriction enzyme cleavage sites of mitochondrial DNA (mtDNA) among four popalations of Colorado potato beetle (CPB). A suite of three enzymes (EcoRI,HpaI,PstI) was sufficient to discriminate among the populations tested. Individuals heteroplasmic for restriction enzyme patterns were found in some populations. Variability in CPB mtDNA should prove useful in efforts to trace the origin and dispersal of the species in North America.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959950
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration and transport of nitrate by the mat-forming sulphur bacterium Thioploca (1995)
    [s.l.] : Nature Publishing Group
    Nature 374 (1995), S. 713-715 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Thioploca mats, sediment and water chemistry were studied along a shelf transect off the Chilean coast during late summer, March 1994 (Fig. 1). In the densest Thioploca mat, at 87m water depth, the wet weight of sheathed Thioploca reached nearly 1 kg m2, of which the total bacterial ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/374713a0
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  • 5
    Electronic Resource
    Electronic Resource
    Model for genetic control of Heliothis virescens (1979)
    Springer
    Theoretical and applied genetics 54 (1979), S. 225-233 
    Details
    ISSN: 1432-2242
    Keywords: Heliothis virescens ; Genetic control ; Population model ; Hybrid sterility ; Tobacco budworm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A model was developed which corrects and extends an earlier one proposed for the control of the tobacco budworm, Heliothis virescens (F.), through hybrid male sterility. Population suppression is effected through the release into natural populations of the backcross progeny of a hybrid between H. virescens and a related species. Thereafter, the system perpetuates itself in nature through continual backcrossing of the fertile backcross females to native H. virescens males. When the proportion of backcross hybrid females in the total population is large enough to draw off the insemination potential of the native males, the native females fail to replace themselves. The present model demonstrated that the ratio of released backcross hybrids to natural H. virescens remains constant in a closed population. Furthermore it was shown that the release ratio necessary to achieve extinction of a closed population is related to the number of females that a male can inseminate and to the population growth rate. Release ratios required to slow natural population growth and to lessen the impact damage of releases on crop plants were also examined. Effects of selection against the backcross females on the predictions of the model were explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00267712
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  • 6
    Electronic Resource
    Electronic Resource
    A non-Darcy model for recirculating flow through a fluid-sediment interface in a cylindrical container (1997)
    Springer
    Acta mechanica 123 (1997), S. 75-87 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A numerical investigation has been undertaken to characterize the axisymmetric laminar flow generated by a rotating disk inside a cylinder with an open top, containing a viscous fluid above as layer of fluid-saturated porous medium. The mathematical model is based on a continuum approach for both fluid and porous regions. Attention is focussed on conditions favouring steady, stable, axisymmetric solutions of the Darcy-Brinkman-Lapwood equation. The accuracy of the method is verified by solving some vortex flow problems in disk-cylinder geometries and comparing the results with: (a) existing numerical solutions and, (b) experimental pressure measurements in a similar geometry. Calculations are performed to investigate the fluid exchange between the porous region (porewater) and the overlying water. Results indicate that flow through composite (fluid-sediment) systems can be handled with good accuracy by the method presented here. With our approach the magnitude of advective porewater transport in sediments may be predicted. This finding is important for improved designs of flux chambers and also for understanding advective transport phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178402
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  • 7
    Electronic Resource
    Electronic Resource
    Genetic regulation of sex pheromone production and response (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 2047-2061 
    Details
    ISSN: 1573-1561
    Keywords: 11-Tetradecenyl acetate ; population genetics behavioral genetics ; Ostrinia nubilalis European corn borer ; Lepidoptera ; Pyralidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The sex pheromone communication system of the European corn borer moth varies intraspecifically. Analyses of pheromonal extracts of wild females, collected in a region where the types (each producing a different isomeric proportion ofZ- andE-11-tetradecenyl acetate) are sympatric, showed that theZ pheromone-production allele frequency was ca. 4 times greater than theE allele. The paucity ofE production and response alleles in the population indicates that moths inheriting those alleles concomitantly inherit some undefined disadvantage. The types interbreed, but the frequency of heterozygous pheromone-production types among wild females was less than predicted by Hardy-Weinberg equilibrium and was evidence of positive assortative mating. Rates of male captures in field traps baited with females of the three pheromonal types also evidenced assortative mating in the population. Progeny tests with males captured in the traps provided circumstantial evidence that pheromone response and production functions in the species are regulated by separate genetic loci and that the loci are not always complementary; i.e., a male can carry an allele coding for production of one pheromonal isomer ratio but can be genetically predisposed to respond to another.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014249
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  • 8
    Electronic Resource
    Electronic Resource
    The amplitude of the c wave in the human ERG as a function of the luminous energy of the stimulus (1981)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 217 (1981), S. 299-307 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Von 4 Probanden wurden Gleichspannungs-Elektroretinogramme abgeleitet. Die c-Welle zeigte eine erhebliche Abhängigkeit von unterschiedlichen Stimulushelligkeiten und Stimuluslängen. Blieb jedoch die Reizlichtmenge konstant, so konnten innerhalb einer Stimuluslänge von 0,05–4 s weitgehend amplitudengleiche c-Wellen abgeleitet werden. Da kurze helle Reize von den Patienten als angenehmer empfunden wurden als lange dunklere, bietet sich eine Reizdauer zwischen 2 und 4 s für klinische Untersuchungen an, ohne daß eine schlechtere Auswertbarkeit der Ableitungen hingenommen werden muß.
    Notes: Abstract Variation of the stimulus intensity and duration over a wide range causes a change in amplitude of the c wave. If the energy of the applied stimulus is kept constant, however, stimuli of 0.05–4 s duration effected c waves that were nearly equal in amplitude. As patients consider shorter stimuli with higher intensities to be more comfortable in ERG recording, stimuli of a duration of 2–4 s seem most appropriate for clinical testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429290
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  • 9
    Electronic Resource
    Electronic Resource
    Comparative life history and respiratory activity of “wild” and colonized Caribbean fruit flies [Dipt.: Tephritidae] (1976)
    Springer
    BioControl 21 (1976), S. 353-357 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les insectes élevés au laboratoire et destinés à être utilisés dans des programmes de lutte biologique doivent présenter des comportements similaires à ceux des insectes sauvages. De façon à étudier les modifications de comportement ainsi que les adaptations aux conditions d'élevage, deux souches de la Mouche antillaise des fruitsAnastrepha suspensa (Loew) ont été comparées. L'une recueillie dans la nature et l'autre adaptée aux conditions d'élevage ont été suivies pendant 5 générations au cours desquelles ont été étudiés la fertilité des œufs, le poids et le nombre de pupes formées, la longévité, le sex-ratio, la fréquence des accouplements, la fécondité et la production de CO2 chez les insectes parfaits. Pendant les 5 génerations les insectes issus de la nature ont présenté par rapport aux insectes d'élevage une fécondité réduite de 51% une durée de développement supérieure de 16% et une production de CO2 pendant la photophase diminuée de 16%.
    Notes: Abstract Insects that are colonized for use in biological control programs must be behaviorally functional with respect to target field populations. To quantify adaptation during colonization and identify some of the behavioral changes that occur during the process, comparable colonies of field-collected and laboratory-adapted Caribbean fruit flies,Anastrepha suspensa (Loew) were monitored through 5 generations for fertility of eggs, weights and yields of pupae, and viability, sex ratio, insemination frequency, fecundity and CO2 production of adults. After five generations, the wild strain still produced 57% fewer eggs, required 6–7 extra days per cycle (16% longer), and produced 16% less CO2 per generation
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371633
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  • 10
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    Pore-water advection and solute fluxes in permeable marine sediments (I): Calibration and performance of the novel benthic chamber systemSandy (2005)
    In:  EPIC3Limnology and Oceanography, 50(3), pp. 768-778, ISSN: 00243590
    Details
    Publication Date: 2017-03-06
    Description: This contribution introduces the benthic chamber system Sandy that was developed for studying in situ solute fluxes in permeable sandy sediments where advective pore-water transport can dominate solute exchange across the sediment-water interface. The Sandy system can be deployed at the seafloor, where it autonomously performs measurements of sediment-water solute fluxes. The innovative features include an insertion mechanism that permits gentle and deep penetration of the chamber into hard consolidated sands with minimum disturbance, and an adjustable stirrer that generates a rotationally symmetric pressure gradient between the center and the circumference of the enclosed sediment surface. In contrast to similar systems, Sandy takes advective pore-water exchange into account. Through adjustment of the stirring rate, defined pressure gradients can be established that are similar in shape and magnitude to natural pressure gradients that develop at topographical structures of current-exposed sediment surfaces. Solute fluxes measured in the chamber at a specific “advective” stirrer setting can be compared with those obtained at reduced stirring, where pressure gradients are absent and solute exchange therefore is restricted to diffusion and bioirrigation. Rates of pore-water exchange that were determined by means of tracer experiments at different stirrer settings in natural coarse-grained North Sea deposits demonstrate the feasibility of this approach. This permits, for the first time, an evaluation of the contribution of advective exchange to the total interfacial solute flux in situ and makes Sandy a valuable tool to study advection-related processes in permeable shelf sediments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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