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  • 2005-2009  (1)
  • 1980-1984  (6)
  • 1955-1959  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 50 (2005), S. 0 
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Historical nutrient changes in Grasmere were investigated using a 300-year record derived from six sediment cores. One core was investigated at high resolution for diatoms, total sedimentary phosphorus, and loss-on-ignition (LOI), and was dated using 210Pb and 137Cs. Six other cores were scanned for magnetic susceptibility, diatoms and LOI to confirm the stratigraphic integrity of the primary record.2. A rise in nutrient levels occurred after 1855 AD. This event was marked by a shift away from benthic diatom assemblages and a rise in Asterionella formosa. The onset of eutrophication from 1855 corresponds to the expansion of the local and tourist population in the area.3. The replacement of A. formosa with Cyclotella spp. ca 1945–65 indicates reduced nutrient loads, possibly because of enhanced flushing brought about by the seasonal rainfall distribution.4. After 1965 a step-wise increase in both absolute and relative amounts of Asterionella was found. High sedimentary P and diatom inferred TP confirmed the high nutrient loading of the lake. Nutrient increase is attributable to problems with the Grasmere village sewage system and the installation of a wastewater treatment works (WwTW) on the River Rothay in 1971. Modifications to the WwTW in 1982 caused an initial improvement, but have not led to a full recovery to pre-1965 ecological conditions.5. The diatom record indicates a further improvement after 1990 by a return toward Achnanthes minutissima.6. The sedimentary archive of sensitive sites provides important benchmarks against which to judge the attainment of water quality targets.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    R & D management 14 (1984), S. 0 
    ISSN: 1467-9310
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper is based on a critical review of the proceedings of the Second International Conference on Interdisciplinary Research held in 1981 in Manchester, England. Two sets of issues important for the management of collaborative research are identified. One is the need to remove ambiguities from the meanings of commonly used terminology, for which more precise definitions are proposed. Cross-disciplinary is used to describe only the nature of the task; multi- and inter-disciplinary are seen as describing alternative organizational ways of executing it. Which way should be used depends objectively on the circumstances.The other set of issues is concerned with the effect institutional setting could have on the possibility of carrying out effective cross-disciplinary activity. Six different settings are identified and broad concepts of group dynamics are used to identify theoretical and practical problems and their possible solutions. The paper concludes with a survey of the practical implications for those managing cross-disciplinary research.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SUCCESS in stabilizing a pinched toroidal discharge was first achieved in the apparatus known as ZETA at the Atomic Energy Research Establishment1. The stabilization was produced by applying a toroidal magnetic field (Bz) to a gas discharge combined with a metal-walled tube. A discharge similarly ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 78 (1984), S. 315-324 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Strings of moored sediment traps were deployed in a 150 m water column over a period covering the growth and collapse of the spring bloom (4 April–3 June 1976) in an area of the northern North Sea. The efficiency of collection of material in the moored traps was compared to collections in free-drifting traps in the same area of deployment. The ways in which the data from the trap collections may be interpreted was considered at some length and a best estimate of the flux of organic carbon and nitrogen to the sediment was made. For the period prior to the spring bloom (4–23 April) this flux was 50 mg C m−2 d−1 (about 20% of primary production). During the bloom (24 April–19 May) it was about 185 mg C m−2 d−1 (35% of production) and during early summer (20 May–3 June) it was 115 mg C m−2 d−1, about 25% of the overlying production. The organic carbon and nitrogen content of the material collected was measured and the material was examined microscopically. There was evidence of a large settlement of diatoms immediately after the spring bloom which was reflected in changes in the C:N and C:chlorophyll ratios of the material collected. This change in biochemical composition of the material may affect its nutritional quality and have a stimulatory effect on the growth and reproduction of the animals living in the sediment.
    Type of Medium: Electronic Resource
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  • 5
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    Unknown
    Provincetown, Mass., etc. : Periodicals Archive Online (PAO)
    Journal of Psychology. 41 (1956) 47 
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  • 6
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We report an example of four generation familial retinoblastoma in which there are three distinct categories of RB gene expression: frank retinoblastoma, unilateral or bilateral; retinoma; and no visible evidence of retinal pathology other than normal degeneration with age. Two large sibships derived from matings informative for RB and EsD provide strong confirmatory evidence for tight linkage between these loci (P=0.0002), and thus assignment of RB to chromosome 13q14. There is a striking difference (P(2%) in RB penetrance between the two principal generations, which suggests that an additional epistatic, host-resistance gene may also be segregating within the family.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European biophysics journal 6 (1980), S. 235-251 
    ISSN: 1432-1017
    Keywords: Alcohols ; Induced photoreceptor noise ; Phototransduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Intracellular potentials are recorded from photoreceptors in a superfused preparation of the retina of a locust compound eye. Chloral hydrate and alkyl alcohols induce a rapid, superfusing reversible depolarization of these photoreceptors when dissolved in the saline. Analysis of voltage noise accompanying depolarization by chloral hydrate suggests that depolarizing ionic pathways are opened briefly and randomly in time in the photoreceptor membranes. This conclusion is supported by measurements of the cell resistance and of voltage noise amplitude as a function of membrane potential. Replacement of superfusate sodium by choline reversibly reduces the effects of chloral hydrate, suggesting that the ionic pathways opened are permeable by sodium. The voltage noise induced by chloral hydrate is compared to that during depolarization by steady illumination of the same cell. As the illumination intensity is increased, the amplitude and the shape of the power spectrum of light-induced voltage noise approach those of drug-induced noise at the same depolarization level. The possibility that these phenomena represent alterations in the mechanism of phototransduction is discussed.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Tropical animal health and production 14 (1982), S. 75-80 
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une étude sérologique a été faite dans l'état du Salvador, en Amérique centrale pour déterminer la répartition et la fréquence relative d'Anaplasma marginale, Babesia bigemina etBabesia bovis. Les résultats suggèrent que ces parasites sont largement répandus dans ce pays avec des taux atteignant 78,5 p. 100 pourA. marginale; 70,5 p. 100 pourB. bigemina à 73,5 p. 100 pourB. bovis. Les études d'épidémiologie montrent que l'infection initiale par ces trois hémoparasites se situe, chez la plupart des animaux, durant les 7 premiers mois de leur vie. En dépit de ces faits qui indiquent une région d'enzootie stabilisée, des foyers de maladie clinique sont fréquemment signalés. 22 de ces foyers ont fait l'objet d'études particulières et les facteurs prédisposant à l'apparition de cas cliniques ont été discutés.
    Abstract: Resumen Se llevó a cabo una encuesta serológica en la república de El Salvador, para determinar al distribución y prevalencia deAnaplasma marginale, Babesia bigemina yBabesia bovis. Los resultados de la encuesta sugirieron que los hemoparásitos se encuentran ampliamente distribuidos en todo el país, con prevalencias de 78.5% paraA. marginale, 70.5% paraB. bigemina y 73.5% paraB. bovis. El conteo de garrapatas efectuado durante el estudio sugiere queBoophilus microplus es el principal vector. Estudios epidemiológicos mostraron que la infección inicial on los 3 parásitos se produjo durante los primeros 7 meses de vida. A pesar de que los resultados del estudio muestran un área de estabilidad enzoótica, se investigaron 22 brotes causados por hemoparásitos. Se discuten en el trabajo factores de manejo implicados en la ocurrencia de los mismos.
    Notes: Summary A serological survey was carried out in the Central American state of El Salvador to determine the distribution and prevalence ofAnaplasma marginale, Babesia bigemina andBabesia bovis. The results suggest that the parasites are widely distributed throughout the country and prevalence rates of 78.5% forA. marginale, 70.5% forB. bigemina and 73.5% forB. bovis were obtained. Tick counts suggest thatBoophilus microplus is the main blood parasite vector. Epidemiological studies showed that initial infection with the 3 blood parasites occurs in most animals during the first 7 months of life. Notwithstanding these facts which indicate an area of enzootic stability outbreaks of clinical disease were frequently reported. Twenty-two such outbreaks were investigated and management factors predisposing to outbreaks of clinical disease are discussed.
    Type of Medium: Electronic Resource
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