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The influence of hydrologic condition and peat oxia on phosphorous and nitrogen dynamics of a conifer swamp
Download1993
A massb alancea pproachw as usedt o determinet he factorsi nfluencingp hosphorusa nd nitrogen dynamicsi n wetlandsc ommont o headwaterc atchmentso f the PrecambrianS hield. The relationships of runoff, water level, water temperaturea, nd anoxiat o the annuala nd seasonalt otal phosphorus( TP) and...
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The biosphere as an increasing sink for atmospheric carbon: estimates from increased nitrogen deposition
Download1993
Estimates of carbon uptake and storage based on global nitrogen deposition, C:N ratios for typical terrestrial ecosystems, and recent ecosystem-scale nutrient studies indicate that 1.0- 2.3 Gt C yr-1 of carbon storage may be stimulated by anthropogenically caused increases in nitrogen deposition...
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1993
Crowell, P.A., Reppy, J.D., Wong, G.K.S., Cho, H.
Measurements of the superfluid density and heat capacity in porous aerogel glasses that are completely filled with liquid helium are presented as examples of critical behavior in the presence of a dilute correlated impurity. Longstanding doubts about the existence of critical behavior in...
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1993
If climatic warming occurs, the first impacts on polar bears (Ursus maritirnus) will be felt at the southern limits of their distribution, such as in James and Hudson bays, where the whole population is already forced to fast for approximately four months when the sea ice melts during the summer....
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1993
The onset of anaerobiosis in barley root tissue (Hordeum vulgare L. cv Himalaya) results in the following metabolic responses. There are rapid increases in the levels of pyruvate, lactate, and ethanol. Malate and succinate concentrations increase over the first 12 h, after which they return to...
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Effects of Source of Metacercariae on Experimental Infection of Zygocotyle lunata (Digenea: Paramphistomidae) in CD-1 Mice.
Download1993
Shostak, A.W., Belosevic, M., Dharampaul, S.
Outbred (CD-1 strain) mice were infected experimentally with metacercariae of Zygocotyle lunata obtained from naturally infected Helisoma trivolvis. Growth, survival, and fecundity of the parasite and gross pathology in the host were evaluated. Metacercariae from 5 snail sources produced 3...
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1993
Density-dependent constraints on parasite growth, survival or reproduction are thought to be important in preventing the unchecked increase in parasite numbers within individual hosts or host populations. While it is important to know where, and with what severity, density dependence is acting...
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1993
Cuticle micromorphology from all 21 species of the Southern Hemisphere conifer genus Agathis Salisbury was studied with scanning electron microscopy. External and internal features of abaxial and adaxial cuticles are characterized for the three recognized sections of the genus. External cuticle...