Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    The effect of hypoxia on locomotor performance and behaviour during escape in Liza aurata (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Escape performance was investigated in the golden grey mullet Liza aurata exposed to various levels of oxygen: 〉85 (i.e. normoxia), 50, 20 and 10 % air saturation. Since the golden grey mullet performed aquatic surface respiration when air saturation approached 15–10 %, escape performance was tested at 10 % air saturation with and without access to the surface (10 % S and 10 % C, respectively). Various locomotor and behavioural variables were measured, such as cumulative distance, maximum swimming speed, acceleration, responsiveness (per cent of responding fish), response latency and directionality. Golden grey mullet showed a decrease in responsiveness when the oxygen level was reduced to 10 % air saturation, whether the surface access was obstructed or not. Hypoxia did not have any effect on the response latency. Cumulative distance and maximum swimming speed over a fixed time were significantly different between normoxic conditions and 10 % C, while no differences were found in maximum acceleration. While the fish's ‘C-bend’ was mainly directed away from the stimulus in normoxia, the proportion of away and towards ‘C-bend’ was random when the oxygen was ≤20 % air saturation. This suggested an impairment of the left-right discrimination at the initiation of the fast start. Hypoxia affected golden grey mullet escape performance mainly through an impairment of responsiveness and directionality, while locomotor performance was affected only in severe hypoxia when the surface was obstructed. The study showed that, in addition to forcing the fish to the surface as shown by previous studies, hypoxia may also reduce fish elusiveness facing a predator by directly impairing its escape performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2005.00884.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cardiorespiratory status of triploid brown trout during swimming at two acclimation temperatures (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 60 (2002), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: At 14° C, standard metabolic rate (75·1 mg O2 h−1 kg−1), routine metabolic rate (108.8 mg O2 h−1 kg−1), active metabolic rate (c. 380 mg O2 h−1 kg−1), critical swimming speed (Ucrit 1·7 BL s−1), heart rate 47 min−1), dorsal aortic pressure (3·2 kPa) and ventilation frequency (63 min−1) for triploid brown trout Salmo trutta were within the ranges reported for diploid brown trout and other salmonids at the same temperature. During prolonged swimming (c. 80%Ucrit), cardiac output increased by 2·3-fold due to increases in heart rate (1·8-fold) and stroke volume (1·2-fold). At 18° C, although standard and routine metabolic rates, as well as resting heart rate and ventilation frequency increased significantly, active metabolic rate and certain cardiorespiratory variables during exercise did not differ from those values for fish acclimated to 14° C. As a result, factorial metabolic scope was reduced (2·93-fold at 18° C v. 5·13-fold at 14° C). Therefore, it is concluded that cardiorespiratory performance in triploid brown trout was not unusual at 18° C, but that reduced factorial metabolic scope may be a contributing factor to the mortality observed in triploid brown trout at temperatures near 18° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2002.tb02390.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    In vitro cardiac performance in triploid brown trout at two acclimation temperatures (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 60 (2002), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The maximum values for heart rate (fH), stroke volume (VH), cardiac output (Q) and myocardial power output, measured in vitro with a perfused heart preparation, as well as the isometric force-frequency relationship for atrial and ventricular muscle strips, in triploid brown trout Salmo trutta were all comparable with established information for diploid rainbow trout Oncorhynchus mykiss. Therefore, it was concluded that triploidy is not associated with a major deficiency in maximum cardiac performance. However, a heightened sensitivity to ryanodine was discovered, which indicated an enhanced role for the sarcoplasmic reticulum in excitation-contraction coupling in these triploid fish. It is suspected that the enhanced role of the ryanodine receptor may be a cellular compensation related to larger cardiac myocytes. It was also clearly established that there was a plateau in maximum cardiac performance between 14 and 18° C and this plateau might be a contributing factor to the reduced factorial aerobic scope and increased fish mortality observed at 18° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2002.tb02391.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Anaphylactoid and anaphylactic reactions to iodinated contrast material (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 54 (1999), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1999.tb04742.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Cardiac disorders in farmed adult brown trout, Salmo trutta L. (2000)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 23 (2000), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: During summer in Brittany, France, sea farmed brown trout, Salmo trutta L., regularly experience a high mortality rate which is associated, at least in part, with cardiac disorders (aneurysms and infarcts). The present study is preliminary to a more extensive research programme, the objective of which is to determine to what extent the physiological performance of the cardiovascular system of brown trout is affected by the environmental conditions the fish experience in farm cages. We conducted a 2-week in situ experiment during which the heart rate of eight sea water acclimatized individuals was telemetered using acoustic tags. During the experimental period, water temperature ranged from 16.0 to 17.6 °C. Water oxygen saturation was above 80% at all times and salinity was very high (35.5‰) but stable. Although they were unfed and not active, seven of out the eight tagged animals displayed near maximum heart beat frequencies, which ranged between 83 and 98 beats per minute (bpm). On the other hand, the eighth animal exhibited medium-range heart rates (50–70 bpm). Using phase delay maps, we established that the maximum heart rate of brown trout at 17 °C was in the range of 96–100 bpm. This result suggests that in our experimental conditions, the heart rate of most of our inactive fish was between 85 and 100% of maximum myocardial performance. We hypothesize that the cardiac failures observed in brown trout during summer are most likely a result of strenuous workloads imposed on the cardiovascular system by a combination of elevated temperature, high salinity and possibly season-related decreased hypo-osmoregulatory abilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.2000.00237.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Evidence of a progressive degranulation of basophil in subjects operated on without adverse reaction (1992)
    Springer
    Inflammation research 36 (1992), S. C199 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have studied the effect of surgery under general anaesthesia on whole blood histamine (WBH) and on basophil morphology in patients operated on without adverse reaction. In 10 patients administered a muscle relaxant and other anaesthetic drugs, WBH decreased significantly the day after surgery and returned to normal within 5 days. Basophils were examined after Percoll gradient concentration: after surgery, the granules were paler and located at the periphery of the cell in a great number of cell. Twentyfour hours later, the number of basophils was reduced and they often did not stain. The morphology returned to normal within 5 days. The variations of WBH were significantly related to the variations of the staining intensity and inversely related to the percent of basophils with peripheral granules. These findings indicate that surgery and/or general anaesthesia leads to a progressive release of mediators by basophils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997332
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Sexual and somatic hybridization in the genusLycopersicon (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 533-546 
    Details
    ISSN: 1432-2242
    Keywords: Lycopersicon ; Sexual hybridization ; Somatic hybridization ; Cybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In recent years, a large number of reports have been published on the recovery of somatic hybrids in the genusLycopersicon and their potential use as a tool in plant breeding programs. Somatic hybridization as a way of enabling the incompatibility barriers which exist within the genusLycopersicon to be bypassed has attracted great interest. WildLycopersicon species harbor numerous interesting agronomic characteristics, which could be transferred to tomato by somatic hybridization. In particular, the production of asymmetric hybrids is explored as an approach to obtain the transfer of only a part of the nuclear genome of wildLycopersicon species. Considerable information is available on the fate of chloroplasts and mitochondria in fusion products inLycopersicon, and unfortunately, cybridization (transfer of chloroplasts and/or mitochondria) seems often difficult to achieve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00838706
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...