GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • Canadian Science Publishing  (5)
  • 1990-1994  (5)
Material
Publisher
  • Canadian Science Publishing  (5)
Person/Organisation
Language
Years
  • 1990-1994  (5)
Year
FID
Subjects(RVK)
  • 1
    Online Resource
    Online Resource
    Characterization of the Tokamak de Varennes ohmic plasma in equilibrium
    Canadian Science Publishing ; 1990
    In:  Canadian Journal of Physics Vol. 68, No. 12 ( 1990-12-01), p. 1353-1358
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 68, No. 12 ( 1990-12-01), p. 1353-1358
    Abstract: Experimental results obtained on the Tokamak de Varennes during a series of reproducible ohmic discharges are presented. Profiles of basic plasma parameters are constructed and compared with theoretical predictions. In particular, the measured plasma resistivity agrees with the neoclassical scaling rather than with Spitzer resistivity. The study of electron-density fluctuations indicates a linear dispersion relation with a propagation velocity of 3.0 × 10 4  cm s −1 . Particle transport investigations are initiated, giving experimental diffusion and convection coefficients across the plasma radius for electrons and impurity ions.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p90-194
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1990
    detail.hit.zdb_id: 2021497-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Mechanisms of Impact of an introduced Crayfish ( Orconectes rusticus ) on Littoral Congeners, Snails, and Macrophytes
    Canadian Science Publishing ; 1991
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 48, No. 10 ( 1991-10-01), p. 1853-1861
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 48, No. 10 ( 1991-10-01), p. 1853-1861
    Abstract: Since its introduction 30 yr ago, Orconectes rusticus has displaced O. propinquus and O. virilis and reduced macrophytes in several northern Wisconsin lakes. Since 1973, rate of displacement by O. rusticus varied among lakes, but relative abundance of O. rusticus increased in all nine lakes sampled in 1988 (eight of which were sampled in 1973 or 1975 and 1980). Using long-term field data and laboratory experiments, we explored mechanisms of differential impact of O. rusticus (relative to congeners) on benthic community structure. Displacement of O. propinquus (but not O. virilis) by O. rusticus increased mean crayfish size. Congener feeding preference did not differ among morphologically different macrophytes or between different-sized snails; however, weight-specific consumption and destruction rates did. Orconectes rusticus consumed more snails than its congeners and sublethally damaged more snails than O. virilis. Orconectes rusticus consumed more macrophyte biomass than O. propinquus; however, O. rusticus did not destroy (consumption plus fragmentation) more macrophyte biomass than its congeners. Changes in benthic community structure after displacement of congeners by O. rusticus may result from larger size (which probably lowers resource depression in the presence of size-selective fish predators) and greater weight-specific reductions of prey.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f91-219
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Effect of decreased pH on force and phosphocreatine in mammalian skeletal muscle
    Canadian Science Publishing ; 1991
    In:  Canadian Journal of Physiology and Pharmacology Vol. 69, No. 2 ( 1991-02-01), p. 305-310
    Details
    In: Canadian Journal of Physiology and Pharmacology, Canadian Science Publishing, Vol. 69, No. 2 ( 1991-02-01), p. 305-310
    Abstract: Phosphocreatine (PCr) and intracellular pH changes were monitored by 31 P-NMR spectroscopy in isolated, arterially perfused cat biceps and soleus muscles, while the pH of the CO 2 –bicarbonate buffered perfusate was decreased from 7.1–7.4 to 6.4–6.7 by increasing the CO 2 in the equilibrating gas from 5 to up to 70%. In biceps (fast twitch) muscles, intracellular pH decreased from 7.0 to 6.6 (30% CO 2 , 30 °C), peak tetanic force decreased by 8%, but the rise and relaxation times of tetani were not significantly changed. In soleus muscles, intracelluar pH decreased from 7.0 to 6.6 (30% CO 2 , 30 °C), peak tetanic force was unchanged, but the rise and relaxation times of tetani were increased by 27 and 112%, respectively. In both muscles greater decreases in tetanic force were observed during repetitive or ischemic stimulation, which resulted in intracelluar pH similar to that produced by hypercapnia. Contrary to previous reports, there was no significant decrease in PCr level in either muscle type with decreased intracellular pH. In the soleus at 30 °C there was a significant increase in PCr level with decreased pH.Key words: cat, biceps brachii, soleus, 31 P-nuclear magnetic resonance spectroscopy, fatigue.
    Type of Medium: Online Resource
    ISSN: 0008-4212 , 1205-7541
    URL: Article
    DOI: 10.1139/y91-047
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1991
    detail.hit.zdb_id: 2004356-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Body size, age distribution, and reproduction in a northern population of wood turtles ( Clemmys insculpta )
    Canadian Science Publishing ; 1992
    In:  Canadian Journal of Zoology Vol. 70, No. 3 ( 1992-03-01), p. 462-469
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 70, No. 3 ( 1992-03-01), p. 462-469
    Abstract: A population of the wood turtle (Clemmys insculpta) was studied on the east side of Algonquin Provincial Park, Ontario, from 1987 to 1990. A total of 77 adults (56 females, 21 males) and 13 juveniles were captured, measured, and individually marked. Age at maturity was 17–18 years at a minimum carapace length of 185 mm for females and 199 mm for males. Our data supported the hypothesis that turtles in northern populations are larger and older at maturity than are those in southern populations. For 21 nests, mean clutch size was 8.8 eggs and egg mass was 96 g. Predators destroyed 15 of 17 nests in 1990, and had injured 60% of adult turtles observed. Therefore, our population had low recruitment, few juveniles, and high levels of predation on nests and adults. Comparisons among females refuted two predictions from optimal egg size theory. Mean width and mass, but not length, of eggs correlated positively with female size, and correlated positively with clutch size, even after effects of body size were removed by partial correlation. However, smaller females in the population had relatively longer eggs than did larger females, whereas the Algonquin females have absolutely smaller eggs than do much smaller females in a New Jersey population.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/z92-070
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1992
    detail.hit.zdb_id: 1490831-1
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Modeling the potential for boron amelioration of aluminum toxicity using the Weibull function
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Botany Vol. 72, No. 8 ( 1994-08-01), p. 1187-1196
    Details
    In: Canadian Journal of Botany, Canadian Science Publishing, Vol. 72, No. 8 ( 1994-08-01), p. 1187-1196
    Abstract: Several recent reports have suggested that boron (B) may alleviate the toxic effects of aluminum (Al) on plant growth, providing improved plant performance on acid soils. To test this hypothesis, an Al-sensitive cultivar of Triticum aestivum L. (cv. Neepawa) was grown in solution culture with 10 concentrations of Al (0–300 μM), in the presence of deficient (0 μM), sufficient (6 μM), luxury (75 μM), or toxic (750 μM) concentrations of B. The effects of both Al and B on the response of roots and leaves to Al was accurately modeled (R 2   〈  0.99) using a modified Weibull function. Comparison of best fit function parameters for the response to Al under varying conditions of B supply failed to reveal any evidence of B amelioration of Al toxicity. The combined effects of Al and B were adequately explained by a multiplicative model. Although formation of stable Al-borate complexes could occur in growth solutions under our experimental conditions, varying the supply of B had little effect on accumulation of Al in roots and leaves. In contrast, increasing Al concentrations in solution resulted in increased immobilization of B in roots and decreased accumulation of B in leaves. Growth of plants with elevated B supply resulted in higher concentrations of B in roots and leaves without improving growth. We suggest that previous reports of B amelioration of Al toxicity must reflect the unique characteristics of soil-based media, and (or) differences among species in internal requirements for B and the effects of Al on B nutrition. Key words: amelioration, aluminum, boron, toxicity, Weibull function, wheat.
    Type of Medium: Online Resource
    ISSN: 0008-4026
    URL: Article
    DOI: 10.1139/b94-145
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 218116-2
    detail.hit.zdb_id: 1481926-0
    SSG: 12
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...