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  • 1
    Electronic Resource
    Electronic Resource
    Influence of triazolam on thermal heat balance in poor sleepers (1984)
    Springer
    European journal of clinical pharmacology 27 (1984), S. 173-179 
    Details
    ISSN: 1432-1041
    Keywords: benzodiazepine ; thermoregulation ; sleep ; rectal temperature ; mean skin temperature ; noise ; triazolam ; cortisol excretion ; urinary catecholamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The influence of a benzodiazepine (triazolam) on the body temperature of poor sleepers during nights disturbed by airplane noises has been examined. Subjects were divided into 3 groups each of 8 men. Following a double-blind design, Group A (controls) received a placebo for 6 consecutive nights, Group B received 0.25 mg triazolam, and Group C received 0.5 mg triazolam on nights N3, N4 and N5. On all other nights Group B and C subjects received placebo. For all 3 groups, nights N3 and N5 were disturbed by 32, semi-randomly distributed airplane noises. Air and wall temperatures (To=20°C), and air humidity (Tdp=10°C), were kept constant. Rectal temperature and 4 local skin temperatures were recorded from each subject. Urine samples were collected each morning for measurement of cortisol and catecholamine levels. Noise was found to cause an increase in body heat storage, but only in Group A. Both drug groups showed impairment of body heat balance. The hypothermic action of triazolam could be explained both by a central action of the drug on the thermoregulatory controller and by a peripheral action on blood vessels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544042
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  • 2
    Electronic Resource
    Electronic Resource
    Role of seepage supply in aquatic vegetation dynamics in former river channels: Prediction testing using a hydroelectric construction (1994)
    Springer
    Environmental management 18 (1994), S. 223-234 
    Details
    ISSN: 1432-1009
    Keywords: Allogenic processes ; Groundwater supply ; macrophytes ; Rhône river ; Succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract One predicted impact of the construction of the hydroelectric plant of Brégnier-Cordon (Upper Rhône River, France) was the rise of the water table in the part of the plain situated upstream from the power plant. This impact made it possible to test the hypothesis that the slowing, indeed the halting, of ecological successions occurs in the former channels upstream from the power plant because of the increase of seepage supply through coarse alluvium. The vegetation of two braided former channels, one situated upstream (impacted site) and one downstream (reference site) of the power plant was studied over a period of nine years, before (1981) and after (1985, 1986, 1987, and 1989) the construction of the hydroelectric power-plant. The two sites had similar vegetation and successional stages at the beginning of the study. The seepage supply increases in the impacted site resulted in the establishment ofChara globularis andRiccia fluitans, indicating groundwater influence, but, after halting in 1985–1986, the ecological succession proceeded slowly again in 1987 and 1989, depicted by continuing eutrophication (expressed particularly by the increasing abundance ofCeratophyllum demersum). As expected, ecological succession was not halted in the reference site. Terrestrialization processes were apparent and changes were more rapid at its upstream part.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02393763
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  • 3
    Electronic Resource
    Electronic Resource
    Connectivity and biocomplexity in waterbodies of riverine floodplains (2002)
    Oxford UK : Blackwell Science Ltd.
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In river corridors, water plays a key role in connecting various landscape patches. This `hydrological connectivity' operates on the four dimensions of fluvial hydrosystems: longitudinal, lateral, vertical, and temporal. The present review focuses on: (1) lateral connectivity that links the main course of a river with floodplain waterbodies; and (2) vertical connectivity, the exchanges between the surface and groundwater via infiltration into the alluvial aquifer and exfiltration of phreatic water from the hillslope aquifer.2. The biocomplexity of fluvial hydrosystems results from interactions between processes operating at various spatial and temporal scales. Differences in the nature and intensity of hydrological connectivity contribute to the spatial heterogeneity of riverine floodplains, which results in high alpha, beta and gamma diversity. Differences in connectivity also provide complementary habitats that are required for the parts of life cycles and life-cycles of some species. Hydrological connectivity also produces antagonistic effects, even within the same waterbody.3. Two temporal scales are distinguished in connectivity dynamics. River level fluctuations within years lead to a pulsing connectivity that drives the functioning of floodplain ecosystems, namely the exchange of organic matter and inorganic nutrients and the shift between production and transport phases. On the scale of decades to centuries, the interactions between various processes increase the biocomplexity of floodplains; for example, river dynamics, which create highly connected waterbodies, compensate for succession that tends towards disconnection. Alternatively, river-bed incision leads to the reduction of fluvial dynamics and to the disconnection of waterbodies, although river incision may increase vertical connectivity where waterbodies are supplied by the hillslope aquifer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00905.x
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  • 4
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    Unknown
    El feminismo: senda no transitada de la Ilustración (1990)
    Madrid : Periodicals Archive Online (PAO)
    Isegoría. 1 (1990:mayo) 139 
    Details
    ISSN: 1130-2097
    Topics: Philosophy
    Notes: NOTAS Y DISCUSIONES
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:n083-1990-001-00-000009
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  • 5
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    Unknown
    Presentación (1992)
    Madrid : Periodicals Archive Online (PAO)
    Isegoría. 6 (1992:nov.) 5 
    Details
    ISSN: 1130-2097
    Topics: Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:n083-1992-000-06-000001
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of triazolam on heart rate level and on phasic cardiac response to noise during sleep (1988)
    Springer
    Psychopharmacology 96 (1988), S. 188-193 
    Details
    ISSN: 1432-2072
    Keywords: Benzodiazepine ; Triazolam ; Human ; Heart rate ; Respiratory rate ; Sleep ; Noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The influence of triazolam on cardiac and respiratory activity of healthy male subjects was examined during nights disturbed by airplane noises and during undisturbed nights. Twenty-four subjects, divided into three groups of eight, slept in the laboratory for 7 nights (N0–N6). Following a double blind design, group A (control group) received a placebo every night. Group B received 0.25 mg triazolam and group C received 0.5 mg on nights N3, N4 and N5. On the other nights, they received a placebo. For all three groups, the nights N0, N3 and N5 were disturbed by 32 semi-randomly distributed airplane noises. Air and wall temperatures (20° C) and air humidity (10° C, 52%) were kept constant. Sleep measures, heart rate and respiratory rate were continuously recorded. Results showed that the largest dose of hypnotic drug produced an increase in tonic heart rate in the first part of each night throughout the treatment period (N3, N4, N5). When compared to baseline disturbed night N0, the phasic cardiac response to the noises was significantly attenuated on only the 1st treatment night (N3). Triazolam had no significant effect on nocturnal respiratory rate. No after-effects of the drug were observed for cardiac and respiratory activity on the withdrawal night (N6). The results suggest that, with regard to the drug action, there was either an increase in arousal threshold or a dissociation between long-lasting and short-lasting modifications of heart rate. Contrary to the single night attenuation of phasic cardiac responses, there was no drug tolerance for the hypnotic-related increase in tonic heart rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177559
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  • 7
    Electronic Resource
    Electronic Resource
    Ecological succession in a former meander of the Rhône River, France, reconstructed by Cladocera remains (1991)
    Springer
    Journal of paleolimnology 6 (1991), S. 113-122 
    Details
    ISSN: 1573-0417
    Keywords: Bosminidae ; Chydoridae ; environmental change ; oxbow lake ; paleolimnology ; river system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract A former meander of the Upper Rhône River, France, is completely filled with silt and occurs as a forested wetland. Bosminidae and Chydoridae (Crustacea, Cladocera) remains are analysed from a 6-m sediment core that reaches coarse sand and gravel layers deposited by running water. The lower layer of fine sediment, deposited by still water after the meander had been cut off, was dated at 1666±211 BC. The likely end of aquatic succession was dated at 800±150 AD. The results, processed using Factorial Correspondence Analysis, suggest 3 phases during the aquatic succession. Phase I, corresponding to open water conditions, is very short. The following phases, indicating the development of macrophyte stands, then a decrease in depth, extend much longer. The unexpectedly long duration (1000–2000 years) of these macrophyte-dominated and marshy phases may be explained by a progressive rise in the mean water level of the Rhône River. The causes of this water level rise may be related to climatic and/or fluvial dynamics changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153736
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  • 8
    Electronic Resource
    Electronic Resource
    A simple device for quantitative pseudoperiphyton sampling (1980)
    Springer
    Hydrobiologia 68 (1980), S. 243-246 
    Details
    ISSN: 1573-5117
    Keywords: Quantitative-sampling ; pseudoperiphyton ; Cladocera ; Copepoda
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A description and a drawing are given for a very simple device for quantitative sampling of small invertebrates living among aquatic macrophytes. It consists essentially of a vertical translucide tube closed down by a bottom sediment core. Some results are given about cladocerans and copepods sampled among littoral vegetation of a fishpond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018833
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  • 9
    Electronic Resource
    Electronic Resource
    The unique headpore of Monospilus dispar (Cladocera, Chydoridae) is not lonesome: new record of minute lateral pores (1992)
    Springer
    Hydrobiologia 232 (1992), S. 145-148 
    Details
    ISSN: 1573-5117
    Keywords: headshield ; phylogeny ; SEM ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The headshield of Monospilus dispar (Cladocera, Chydoridae, Aloninae) was characterized by the presence of a unique headpore. Scanning Electron Microscopy shows the occurrence of minute pores close to the main headpore. The intimate structure of the main headpore is formed by concentric lamellae. This new information leads to new considerations about phylogeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017473
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  • 10
    Electronic Resource
    Electronic Resource
    Recovery of riverine vegetation after experimental disturbance: a field test of the patch dynamics concept (1996)
    Springer
    Hydrobiologia 321 (1996), S. 53-68 
    Details
    ISSN: 1573-5117
    Keywords: river plants ; spatial heterogeneity ; temporal heterogeneity ; floods ; ecosystem resilience ; strategies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Patch Dynamics Concept predicts different recovery patterns of communities after disturbance according to the spatial and temporal heterogeneity of the habitat. The aim of this study was to test the predictions arising from the Patch Dynamics Concept on the recovery of macrophyte communities after an experimental disturbance. The test was based on the comparison of the vegetation recovery in three stations located on former channels of the Rhône River, France, differing by their temporal heterogeneity, which was estimated by the frequency of flood scouring. In each station the experimental disturbance was set up by uprooting the aquatic plants in three experimental sets comprising four 1 m2-plots. The aquatic plants were surveyed in these sets as well as in their reference sets from July to November 1991. As predicted, the most frequently disturbed station recovered its species richness (19 species) and its vegetation cover in less than two months. The biological traits of the species occurring in this station are considered as r-strategies. The species colonizing the experimental sets were not necessarily present on the sets before the disturbance, but occurred regularly on other sites station. The rapidity of the community recovery demonstrates the high resilience of this ecosystem. According to the unpredictable character of its recolonization, the macrophyte community of this station could be said to be ‘founder controlled’ with competitive lottery for establishment. The station with intermediate temporal heterogeneity was overgrown by some r-selected species but the community recolonization was predictable and this station had intermediate resilience. Its species richness was low (6 species). The less frequently disturbed station presented low resilience with a slow recovery of its community (more than 5 months); the species richness (4 species) and the traits of some species were related to K-strategies while others were related to r-strategies. The macrophyte community of this station could be said to be ‘dominance controlled’. Different patterns of recovery of the macrophyte communities of former channels of the Rhône River could be depicted according to their temporal heterogeneity; these patterns were consistent with the hypotheses arising from the Patch Dynamics Concept. However, the competitive lottery appeared to be limited at the scale of our experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018677
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