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  • 1
    Electronic Resource
    Electronic Resource
    Application of otolith analyses to investigate broad size distributions of young yellow perch in temperate lakes (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Otolith analyses were used to back-calculate young-of-the-year (YOY) yellow perch Perca flavescens hatch-date estimates to interpret broad length distributions observed within a small Great Lake, Lake St. Clair, and a small inland lake, Lake Opinicon, during 1998. For the Great Lake, the earliest observed hatch date occurred 2 weeks after suitable water temperatures and latest hatch dates occurred the same week temperatures were considered too warm for spawning. For the inland lake, the earliest hatch date occurred 4 weeks after suitable water temperatures and the latest hatch dates occurred 2 weeks after the water temperatures were considered too warm for spawning. It is inferred that spawning in each lake had a duration of 〉9 weeks. This suggests that natural perch populations can protract their spawning season opportunistically under the appropriate environmental cues. During 1998, these cues involved a shortened winter, earlier spring, and slow warming to typical summer temperatures, caused by the El Niño-Southern Oscillation. Time of YOY hatch determined the absolute opportunity for growth and resulted in a match or mismatch with optimal foraging conditions and contributed to the development of the observed YOY length distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb00512.x
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  • 2
    Electronic Resource
    Electronic Resource
    Length–weight relationship and a relative condition factor equation for lake sturgeon (Acipenser fulvescens) from the St Clair River system (Michigan, USA) (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Several USA state, federal, and Canadian agencies study lake sturgeon (Acipenser fulvescens) within the St Clair River and Lake St Clair, collectively referred to hereafter as the St Clair River (SCR) system. Previously, there has been no set standard for determining condition for SCR system lake sturgeon. Condition measures the variation from the expected weight for length as an indicator of fatness, general well-being, gonad development, etc. The aim of this project was to determine the length–weight relationship of lake sturgeon caught from the SCR system, from which a relative condition factor (Kn) equation could be derived. Total length (TL, mm) and weight (W, kg) were measured for 1074 lake sturgeon (101 males and 16 females were identifiable) collected by setline and bottom trawl from the SCR system in May–September, 1997–2002. Analysis of covariance found no difference in the length–weight relationship between sampling gear or sex. Least-squares regression of log10W × log10TL produced the overall equation logW = 3.365logTL − 9.320. Using the exponential form of the slope and y-intercept, relative condition factor for lake sturgeon from the SCR system can be calculated as Kn = W/[(4.786 × 10−10)(TL3.365)]. Equations for males and females were also developed. Overall, body condition was significantly correlated with both age and girth; no significant difference in Kn by sex was found. In general, the SCR lake sturgeon population was near the upper ends of growth and condition ranges listed in the literature, comparable with those populations that are at similar latitudes. Although condition factors should be interpreted with caution, proper use of a standard equation provides a non-lethal measure of overall fish health that can be used by biologists and managers in ongoing efforts to restore lake sturgeon throughout the Great Lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2004.00635.x
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  • 3
    Electronic Resource
    Electronic Resource
    Abundance, age structure, and spatial distribution of lake sturgeon, Acipenser fulvescens, in the St Clair System (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of applied ichthyology 18 (2002), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2002.00387.x
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  • 4
    Electronic Resource
    Electronic Resource
    Expression of two nuclear genes encoding chloroplast proteins during early development of cucumber seedlings (1987)
    Springer
    Planta 170 (1987), S. 99-110 
    Details
    ISSN: 1432-2048
    Keywords: Chlorophyll a/b-binding protein ; Cucumis (chloroplast protein) ; Gene expression (light dependence) ; Light and gene expression ; Ribulose bisphosphate carboxylase-oxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cloned complementary DNA probes have been used to measure steady-state transcript levels for the small subunit of ribulose bisphosphate carboxylase-oxygenase (SSU) and the chlorophyll a/b-binding protein (LHCP) in cotyledons during early development of cucumber seedlings. Initial accumulation of trancripts to SSU occurs 2d after germination and is independent of light and developmentally programmed. Although transcripts accumulate in dark-grown tissues, their levels increase rapidly in light-grown cotyledons from day 4, coinciding with emergence above the soil, so that by day 6 levels are 2.4 times higher in light-grown compared with dark-grown cotyledons. In contrast, accumulation of transcripts to LHCP occurs only in light-grown cotyledons. Southern blot analysis of genomic DNA indicates that in cucumber there are one and two genes encoding SSU and LHCP, respectively, considerably fewer than in those other plant species that have been examined. Both LHCP genes are expressed in light-grown cotyledons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392386
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  • 5
    Electronic Resource
    Electronic Resource
    The physiological effects of ionic lanthanum on the insect blood-brain barrier (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 720-721 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Lanthanum had a small effect on the barrier, but did not significantly increase its sodium or patossium permeability. There was no effect on nerve conduction unless the barrier was deliberately damaged. The results lend confidence to the use of lanthanum as an extracellular tracer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01919852
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  • 6
    Electronic Resource
    Electronic Resource
    High permeability of insect blood-brain barrier to alcohols demonstrated by an electrophysiological technique (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 1194-1196 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using the anaesthetic effects of the alcohols to measure their concentration within the cockroach central nervous system, it is shown that the lower homologues have access half-times of only a few seconds. Slower access of the higher homologues is interpreted in terms of a reservoir effect resulting from their higher liposolubility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326789
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  • 7
    Electronic Resource
    Electronic Resource
    Morphology and tectonics of the Romanche Transform and its environs (1994)
    Springer
    Marine geophysical researches 16 (1994), S. 427-453 
    Details
    ISSN: 1573-0581
    Keywords: Romanche ; transform fault ; equatorial Atlantic ; tectonics ; morphology ; GLORIA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We describe the results of GLORIA surveys of the Romanche Transform and neighbouring areas of the Equatorial Atlantic Ocean. These surveys have imaged the whole of the Romanche Transform Fault, the eastern end of the Saint Paul Transform, the spreading centre joining them, and the northern part of the spreading centre between Romanche and Chain transforms. They have also imaged representative parts of the off-axis seafloor structure in these areas, and have facilitated preparation of a new bathymetric map, which is presented here. Contrary to previous descriptions of the area, we have found that there is ‘normal’ spreading fabric (volcano-tectonic lineaments trending NNW-SSE orthogonal to the spreading direction) between these major equatorial fracture zones. This implies that normal seafloor spreading processes have operated there. The Romanche Transform Domain, within which normal spreading fabric is either absent or heavily modified, and transform-related structures predominate, is about 100 km wide. There are multiple transform faults within Saint Paul Fracture Zone, of which we have imaged the active traces of the two southernmost ones. These transforms are joined by short but otherwise normal spreading segments. The Romanche Transform is shorter than previously thought, with a length of 840 km. This is equivalent to an age offset of about 50 Ma. The transform has a complex system of short normal and oblique spreading centres at its eastern intersection, forming an overall oblique section of ridge which may have recently cut off the corner of an earlier, simple, orthogonal ridge-transform intersection. The recent complex system appears to have developed at about 1.5 Ma. An oblique valley is mapped south of the western end of Romanche Transform, and is thought to be the fracture zone trace of an old transform offset between Romanche and Chain transforms. This transform disappeared at about chron 8 (26.9 Ma), as its trace is not seen between 20° W and the spreading centre.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01270518
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  • 8
    Electronic Resource
    Electronic Resource
    Microelectrode amplifier with improved method of input-capacitance neutralisation (1977)
    Springer
    Medical & biological engineering & computing 15 (1977), S. 450-454 
    Details
    ISSN: 1741-0444
    Keywords: High-impedance amplifier ; Capacitance neutralisation ; Noise ; Input current
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Décrit un circuit permettant d'utiliser la capacité d'entrée d'un circuit intégré comme capacité de feedback pour neutraliser la capacité totale d'entrée et également pour injecteur des pulsations de courant à l'entrée. Comparé avec la méthode conventionnelle consistant à ajouter des condensateurs discrets pour effecter ces fonctions, ce dispositif a une capacité totale plus faible à l'entrée, ce qui réduit les bruits de haute fréquence produits par l'amplificateur et facilite l'obtention d'une capacité efficace faible. Une version modifiée dotée d'un courant d'entrée très faible (0,1 pA) ce qui permet son utilisation avec des microélectrodes sensibles aux ions, est également décrite.
    Abstract: Zusamenfassung Es wird eine Schaltung beschrieben, welche die Verwendung der Eingangskapazität einer integrierten FET-Eingangsschaltung sowohl als Rückkopplungskapazität zur Neutralisation der Gesamteingangskapazität, wie auch zum Anlegen von Stromimpulsen in den Eingang gestattet. Verglichen mit der konventionellen Methode der Hinzufügung gesonderter Kondensatoren zur Ausführung dieser Funktionen führt diese Konzeption zu einer niedrigeren Gesamtkapazität am Eingang, wodurch das durch den Verstärker verursachte HF-Rauschen reduziert und die Erzielung einer niedrigen effektiven Kapazität erleichtert wird. Ein abggewandelte Version mit einem ultraniedrigen (0·1 pA) Eingangsstrom für Verwendung mit ionen-empfindlichen Mikroelektroden wird ebenfalls beschrieben.
    Notes: Abstract A circuit is described which allows the input capacitance of an f.e.t. input integrated circuit to be used both as the feedback capacitance to neutralise the total input capacitance and to inject current pulses into the input. Compared with the conventional method of adding discrete capacitors to perform these functions, this design results in a lower total capacitance at the input, which reduces the high-frequency noise generated by the amplifier and facilitates the achievement of a low effective capacitance. A modified version having an ultralow (0·1pA) input current, for use with ion-sensitive microelectrodes, is also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458001
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