Betula Pendula
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Evaluation of the wood of Betula pendula, Eucalyptus globulus and of hybrid of Eucalyptus grandis x Eucalyptus urophylla as a raw-material for kraft pulp production / Avaliação da madeira de Betula pendula, Eucalyptus globulus e de híbrido de Eucalyptus grandis x Eucalyptus urophylla destinadas à produção de polpa celulósica Kraft
A madeira é a principal variável de custo na produção de polpa celulósica. A polpa celulósica obtida a partir da madeira de folhosas é principalmente utilizada para produção de papéis de escrita e impressão assim como, a produção de papéis para fins sanitários; para estes usos normalmente a polpa celulósica deve ser branqueada. Mundialmente,
Publicado em: 2007
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2. Essential Oil of Betula pendula Roth. Buds
The essential oil of Betula pendula Roth. buds was obtained using both hydrodistillation and microdistillation techniques and their chemical compositions were analyzed using both gas chromatography (GC) and gas chromatography–mass spectrometry (GC-MS). Overall, more than 50 compounds were identified representing 80% and 92% for hydrodistillation and microd
Oxford University Press.
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3. Identification of Genes Differentially Expressed in Extraradical Mycelium and Ectomycorrhizal Roots during Paxillus involutus-Betula pendula Ectomycorrhizal Symbiosis
The development of ectomycorrhizal symbiosis leads to drastic changes in gene expression in both partners. However, little is known about the spatial regulation of symbiosis-regulated genes. Using cDNA array profiling, we compared the levels of expression of fungal genes corresponding to approximately 1,200 expressed sequenced tags in the ectomycorrhizal roo
American Society for Microbiology.
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4. Host-driven population dynamics in an herbivorous insect
Understanding the nature and relative importance of endogenous (density-dependent) and exogenous (density-independent) effects on population dynamics remains a central problem in ecology. Evaluation of these forces has been constrained by the lack of long time series of population densities and largely limited to populations chosen for their unique dynamics
The National Academy of Sciences.
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5. A natural experiment on plant acclimation: lifetime stomatal frequency response of an individual tree to annual atmospheric CO2 increase.
Carbon dioxide (CO2) has been increasing in atmospheric concentration since the Industrial Revolution. A decreasing number of stomata on leaves of land plants still provides the only morphological evidence that this man-made increase has already affected the biosphere. The current rate of CO2 responsiveness in individual long-lived species cannot be accurate
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6. Hydrogen Peroxide Activates Cell Death and Defense Gene Expression in Birch1
The function of hydrogen peroxide (H2O2) as a signal molecule regulating gene expression and cell death induced by external stresses was studied in birch (Betula pendula). Ozone (O3), Pseudomonas syringae pv syringae (Pss), and wounding all induced cell death of various extents in birch leaves. This was temporally preceded and closely accompanied by H2O2 acc
American Society of Plant Physiologists.
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7. Life-history strategies affect aphid preference for yellowing leaves
According to the nutrient-translocation hypothesis, yellowing tree leaves are colonized by aphids at the end of the growing season owing to improved availability of nutrients in the phloem sap after chlorophyll degradation. We measured aphid densities on potted Betula pendula seedlings in a field site where a small proportion of foliage rapidly turned yellow
The Royal Society.
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8. Ethylene Insensitivity Modulates Ozone-Induced Cell Death in Birch1
We have used genotypic variation in birch (Betula pendula Roth) to investigate the roles of ozone (O3)-induced ethylene (ET), jasmonic acid, and salicylic acid in the regulation of tissue tolerance to O3. Of these hormones, ET evolution correlated best with O3-induced cell death. Disruption of ET perception by transformation of birch with the dominant negati
American Society of Plant Biologists.
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9. Exploitation of pollen by mycorrhizal mycelial systems with special reference to nutrient recycling in boreal forests.
Very large quantities of pollen are released annually by wind-pollinated trees, which dominate northern forest ecosystems. Since pollen is enriched in both nitrogen and phosphorus, this recurrent pulse of deposition constitutes a significant potential source of these elements in what are known to be severely nutrient-limited systems. Here, we demonstrate for
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10. The choice of reducing substrate is altered by replacement of an alanine by a proline in the FAD domain of a bispecific NAD(P)H-nitrate reductase from birch.
Differences in the amino acid sequence between the bispecific NAD(P)H-nitrate reductase of birch (Betula pendula Roth) and the monospecific NADH-nitrate reductases of a variety of other higher plants have been found at the dinucleotide-binding site in the FAD domain. To pinpoint amino acid residues that determine the choice of reducing substrate, we introduc
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11. Short-Day Potentiation of Low Temperature-Induced Gene Expression of a C-Repeat-Binding Factor-Controlled Gene during Cold Acclimation in Silver Birch1[w]
Development of winter hardiness in trees is a two-stage process involving sequential perception of distinct environmental cues, short-day (SD) photoperiod and low temperature (LT). We have shown that both SD and LT are recognized by leaves of silver birch (Betula pendula cv Roth) leading to increased freezing tolerance, and thus leaves can be used as an expe
American Society of Plant Biologists.