betula alnoides/atrofija

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Elevated CO2 reduces field decomposition rates of Betula pendula (Roth.) leaf litter.

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Ielogoties Reģistrēties

The effect of elevated atmospheric CO2 and nutrient supply on elemental composition and decomposition rates of tree leaf litter was studied using litters derived from birch (Betula pendula Roth.) plants grown under two levels of atmospheric CO2 (ambient and ambient +250 ppm) and two nutrient regimes

Regeneration of Betula albosinensis in strip clearcut and uncut forests of the Qinling Mountains in China.

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Ielogoties Reģistrēties

To contribute to a better understanding of the regeneration strategy of Betula albosinensis forests and the likely reasons behind either the successful recovery or failure after strip clearcutting, we compared the population structures and spatial patterns of B. albosinensis in eight B. albosinensis

Rapid wound-induced resistance in white birch (Betula pubescens) foliage to the geometrid Epirrita autumnata: a comparison of trees and moths within and outside the outbreak range of the moth.

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Ielogoties Reģistrēties

Two strains of a geometrid defoliator, Epirrita autumnata, were used in bioassays to test existence and relative efficacy of rapid, wound-induced foliage resistance in two provenances of the white birch. One birch and one moth strain originated in the outbreak range of the moth and another outside

Regeneration and coexistence of two Abies species dominating subalpine forests in central Japan.

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Ielogoties Reģistrēties

The mechanism of coexistence of the dominant firs Abies veitchii and A. mariesii is described in relation to regeneration patterns for climax subalpine forests of the northern Yatsugatake Mountains, central Honshu, Japan. Two mature stand types, pure conifer stands of Abies spp., and mixed stands of

Evaluation of the antioxidant activity of Betula pendula leaves extract and its effects on model foods.

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Ielogoties Reģistrēties

BACKGROUND Betula pendula Roth (Betulaceae) exhibits many pharmacological activities in humans including anticancer, antibacterial, and antiviral effects. However, the antioxidant activity of BP towards lipid degradation has not been fully determined. OBJECTIVE The BP ethanol and methanol extracts

Biological and environmental predictors of heterogeneity in neurocognitive ageing: Evidence from Betula and other longitudinal studies

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Ielogoties Reģistrēties

Individual differences in cognitive performance increase with advancing age, reflecting marked cognitive changes in some individuals along with little or no change in others. Genetic and lifestyle factors are assumed to influence cognitive performance in aging by affecting the magnitude and extent

Free Recall Episodic Memory Performance Predicts Dementia Ten Years prior to Clinical Diagnosis: Findings from the Betula Longitudinal Study.

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Ielogoties Reģistrēties

OBJECTIVE Early dementia diagnosis is a considerable challenge. The present study examined the predictive value of cognitive performance for a future clinical diagnosis of late-onset Alzheimer's disease or vascular dementia in a random population sample. METHODS Cognitive performance was

Induced resistance in mountain birch: defence against leaf-chewing insect guild and herbivore competition.

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Ielogoties Reģistrēties

The effect of leaf damage simulating the feeding of early season insect herbivore species, e.g. Epirrita autumnata, to mountain birch, Betula pubescens ssp. tortuosa, on the performance of insect larvae was studied with eleven leaf-chewing sawfly species. I found variation in the results that was

Stability of specific IgE antibodies to common food and inhalant allergens.

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Ielogoties Reģistrēties

OBJECTIVE To determine the optimum storage temperature for serum allergen specific IgE antibodies (sIgE) to common food and inhalant allergens. METHODS Patient sera with sIgE concentrations ≥0.7kIUA/l were pooled accordingly: pool 1-peanut and hazelnut, pool 2-egg white, cow's milk and cod fish,

[Developmental instability of the organism as a result of pessimization of environment under anthropogenic transformation of natural landscapes].

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Ielogoties Reģistrēties

The value of fluctuating asymmetry is considered to be an indicator of the developmental instability of the organism. The consequences of activities of the mining industry plants, which are characterized by alienation and transformation of large areas of natural landscapes, are analyzed as an

A 700-year paleoecological record of boreal ecosystem responses to climatic variation from Alaska.

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Ielogoties Reģistrēties

Recent observations and model simulations have highlighted the sensitivity of the forest-tundra ecotone to climatic forcing. In contrast, paleoecological studies have not provided evidence of tree-line fluctuations in response to Holocene climatic changes in Alaska, suggesting that the forest-tundra

Sawfly poisoning in sheep and goats.

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Ielogoties Reģistrēties

In September 1984 some sheep in a flock of 250 suffered depression, anorexia, incoordination and difficulty in rising; 50 ewes and weaners died. Post mortem examination revealed petechial bleeding, massive acute liver necrosis and in some animals degeneration of the kidney tubules. The rumen and gut

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