ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    Blood oxygen tension and content in carp, Cyprinus carpio L., during hypoxia and methaemoglobinaemia (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 23 (1992), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Carp respond to water hypoxia with an evaluation in the rate of gill ventilation. In order to characterize closer the adequate stimulus for the increase in respiratory drive specimens of carp, Cyprinus carpio L., were exposed simultaneously to moderate environmental hypoxia (PwO2˜ 75mmHg, 10kPa) and elevated water nitrite concentration (089 ± 0-lmmol/l) for 24h. The differential effects of these treatments were utilized to distinguish between the responses to an immediate reduction in water and arterial Poa (P,O2), and to the slowly developing reduction of arterial oxygen content (CaO2) and functional oxygen saturation (SaO2). After onset of hypoxia gill ventilation quickly increased, leading to a reduction in PaCO2. Slowly rising blood methaemoglobin levels resulted in a gradual decline in CaO2 and SaO2 over 24h, whereas P002 remained steady for the entire exposure period. This pattern of lowered Paco2 and PaO2, essentially constant for 24 h, together with the lack of any correlation with changes in CaO2, suggests PO2 (Pa,O2 and/or Pwo2) as the primary stimulus in the regulation of ventilation of carp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1992.tb00811.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cardio-respiratory synchronization and myocardial function in hypoxic carp, Cyprinus carpio L. (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 39 (1991), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Moderate hypoxia (Pio2, = 50 mmHg) caused tachycardia in carp, Cyprinus curpio Linnaeus, whereas severe hypoxia (Pio2, from 30 to 5 mmHg) coincided with bradycardia accompanied by alterations of the waveforms of the electrocardiogram. A cardio respiratory synchronization developed during hypoxia and was maintained during bradycardia. The data raised the question: Does hypoxic bradycardia in part result from myocardial dysfunction or only from regulatory adjustments?
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1991.tb04352.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The effects of temperature and hyperoxia on arterial PO2 and acid-base status in Piaractus mesopotamicus (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of hyperoxia and change of temperature (range 20–30° C) on blood gases were studied in the teleost fish Piaractus mesopotamicus, native to several major river systems in Brazil. Large hyperoxia-induced increases of arterial Po2 (Pao2) indicated that true branchial blood shunts are negligible in relation to total gill perfusion. This implies that blood gases will be influenced by ventilation rather than by shunts. Acute variations of temperature (t) were accompanied by changes of arterial blood pH (on the average ΔpHaΔt−1 of — 0·015 units °C−1), due mainly to alterations of Paco2: 2·4 mmHg at 20° C, 5·0 mmHg at 30° C. Concomitantly, Pao2 declined from 116 mmHg (20° C) to 89 mmHg (30° C). The data suggest that temperature-induced changes of acid-base status depend mainly on gill ventilation and that the decrease of Pao2 with higher temperature is a result of this regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01661.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Respiratory responses to hypoxia in relation to mode of life of two erythrinid species (Hoplias malabaricus and Hoplias lacerdae) (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 41 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Predominantly, Hoplias malabaricus inhabits stagnant O2 poor environments, whereas Hoplias lacerdae occurs in well-aerated streams. The present study evaluates the influence of mode of life on O2 uptake and gill ventilation in equally-sized (300 g) specimens of this genus at 25° C. Comparing the species, H. lacerdae was characterized by the highest O2 uptake and gill ventilation combined with a relatively higher cost of breathing and a lower O2 extraction. Both species substantially increased ventilation in response to hypoxia with the difference that H. malabaricus exclusively augmented tidal volume, whereas H. lacerdae also increased breathing frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02708.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Effects of environmental hypercapnia on pulmonary ventilation of the South American lungfish (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: Aquatic hypercapnia at PCO2 of 55 mmHg significantly increased pulmonary ventilation in the South American lungfish Lepidosiren paradoxa, whereas no significant increases occurred when hypercapnia was applied to the gas phase with or without concomitant aquatic hypercapnia. On return from gas phase hypercapnia to inspiration of air there was a marked transient increase of ventilation. This post-hypercapnic response is discussed in relation to the possible presence of upper airway or pulmonary CO2 receptors that inhibit pulmonary ventilation during hypercapnia. Post-hypercapnic hyperpnea has been reported for various groups of reptiles and for anuran amphibians. The occurrence of post-hypercapnic hyperpnea in Lepidosiren adds new information related to the evolution of respiratory regulation in vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb00564.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Oxygen and acid-base status related drives to gill ventilation in carp (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Gill ventilation in carp Cyprinus carpio increased 50% with a reduction of [O2]a to 60% of the control value. Small decreases of inspired PO2 also increased ventilation, which occurred without any significant changes of the blood gas picture. Ventilation increased with hypercapnia but only if [O2]a became reduced by concomitant Bohr and Root shifts. Consistently, hypercapnia failed to increase ventilation when combined with hyperoxia. Therefore, it was not possible to ascribe any ventilatory response to specific CO2/pH receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb00753.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Ventilatory control of arterial PO 2 in the turtleChrysemys picta bellii: Effects of temperature and hypoxia (1983)
    Springer
    Journal of comparative physiology 151 (1983), S. 145-153 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ventilation, pulmonary O2 uptake, arterial blood gases and pH were measured in fresh water turtles,Chrysemys picta bellii, during voluntary diving and surfacing at temperatures of 10, 20 or 30°C. At each temperature, the animals were also exposed to declining levels of inspired O2 concentration with blood samples taken at various stages of breath holding and during episodes of breathing. The breathing pattern ofChrysemys consists of a series of breaths followed by a breath hold period which usually coincides with a period of submergence. The ventilatory response to hypoxia at all temperatures involved a decrease in the diving time as well as an increase in the tidal volume. The breathing frequency during ventilatory periods decreased slightly during severe hypoxia. The increase of ventilation in response to hypoxia was most pronounced at 30°C; ventilation approximately doubled as arterialP O 2 decreased from 60 to 30 Torr and increased more than tenfold as arterialP O 2 approached 10 Torr. In comparison, the ventilatory response of animals at lower temperatures occurred at much lower levels of arterialP O 2; at 10°C ventilation did not increase relative to normoxic control values until arterialP O 2 fell to about 5 Torr. The observed reduction in the ventilatory response to environmental hypoxia at lower temperatures can probably be attributed to the sevenfold reduced pulmonary O2 uptake at 10°C as compared to 30°C in combination with the shift inP 50 of the blood oxygen dissociation curves from 29 (30°C) to 5 Torr (10°C). The present data suggest that desaturation of the blood during hypoxia is a leading factor for the increase in ventilation as an attempt to maintain normal O2 uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Oxygen transport in the green sea turtle (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 275-280 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Green sea turtles (Chelonia mydas) are well known as endurance swimmers and divers. Physiological correlates of these traits were studied in 9 adult sea turtles (mean body mass=87 kg) at a body temperature of 25°C. The respiratory properties of the blood were similar to those of other turtles except for a higher oxygen affinity (P 50=18.2 Torr, pH 7.6), which may be an allometric function. Resting, systemic blood flow, calculated from the Fick principle was 21.5 ml·kg−1. min−1, similar to values reported for other turtles. Pulmonary blood flow, measured by mass spectrometry of acetylene uptake in the lungs was 24.0 ml·kg−1·min−1, not significantly different from the calculated systemic flow. Other evidence of a small (net) intracardiac shunt is the high arterial saturation (ca. 90%) of arterial blood. This distinctive feature of O2 transport inC. mydas provides an $$[Ca_{O_2 } - C\bar \upsilon _{O_2 } ]$$ content difference of 4.1 ml· dl−1. This results in a relatively low blood convection requirement at rest $$\dot Q_t /\dot V_{O_2 }$$ =24.4 mlbtps·mlstpd −1), similar to that for many mammals. This would favor a high maximum O2 uptake, as measured by others in this species. The relatively high O2 affinity of blood in this species could be adaptive to “loading” O2 during intermittent breathing while swimming and to utilizing the lung O2 store during the progressive hypoxia of diving.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464407
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Pulmonary diffusing capacity in reptiles (Relations to temperature and O2-uptake) (1981)
    Springer
    Journal of comparative physiology 142 (1981), S. 509-514 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pulmonary CO-diffusing capacity (D l CO), lung volume, pulmonary perfusion and O2-uptake were measured by non-invasive techniques in the lizardsVaranus exanthematicus andTupinambis teguixin (mean body weight 2.2 kg for both species). The CO-diffusing capacity was at 25–27°C 0.059 mlstpd·kg−1·min−1·Torr−1 inVaranus, which is 47% greater than the value of 0.040 mlstpd·kg−1·min−1·Torr−1 inTupinambis. The lung volume ofVaranus was 36 ml·kg−1 and that ofTupinambis 20 ml·kg−1. At 35–37°C the diffusing capacity of lizard lungs are about 25% of those for mammals of comparable size. InVaranus pulmonary CO-diffusing capacity increased with temperature from 0.027 mlstpd·kg−1·min−1·Torr−1 at 17–19 °C to 0.075 mlstpd·kg−1·min−1·Torr−1 at 35–37 °C. This change closely matched a concomitant increase of O2-uptake. Pulmonary perfusion increased from 27 ml·kg−1·min−1 to 55 ml·kg−1·min−1 within this temperature range. The study emphasizes that pulmonary diffusing capacity cannot be fully evaluated without information on pulmonary perfusion and O2-uptake. In reptiles and other ectotherms diffusing capacity must be reported at specified body temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688983
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Functional mitochondria in snake Bothrops alternatus erythrocytes and modulation of HbO2 affinity by mitochondrial ATP (1993)
    Springer
    Journal of comparative physiology 163 (1993), S. 614-619 
    Details
    ISSN: 1432-136X
    Keywords: Erythrocyte mitochondria ; Oxidative phosphorylation ; Mitochondrial respiration ; HbO2 affinity Snake, Bothrops alternatus ; ATP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Digitonin was applied to permeabilize the plasma membrane of Bothrops alternatus erythrocytes to study respiration, oxidative phosphorylation and Ca2+ transport by mitochondria in situ. These mitochondria oxidized added NAD-linked substrates, succinate and N,N,N′, N′-tetramethyl-p-phenylenediamine. Respiration was sensitive to rotenone and cyanide but not to antimycin A. This indicates that Bothrops mitochondria possess the respiratory complexes NADH-ubiquinone, succinate-ubiquinone, and ferrocytochrome c-oxygen oxidoreductases, although the lack of sensitivity to antimycin A raises doubt about the composition of the ubiquinol cytochrome c-reductase complex. An ability to build up and sustain a membrane potential was documented by their capacity to accumulate tetraphenylphosphonium and Ca2+ through an uncoupler-sensitive mechanism. Addition of ADP caused a transient decrease in the membrane potential, indicating that this is the predominant driving force for ATP synthesis as in most types of mitochondria. Uncoupling of phosphorylation from the oxidative process increased hemoglobin O2 affinity, which suggests that ATP production by mitochondria may participate in modulation of O2 transport by hemoglobin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302122
    Location Call Number Expected 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...