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Страница 1 от 860 резултата
Fragmentary gene sequences negatively impact gene tree and species tree reconstruction.
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Species tree reconstruction from genome-wide data is increasingly being attempted, in most cases using a two-step approach of first estimating individual gene trees and then summarizing them to obtain a species tree. The accuracy of this approach, which promises to account for gene tree discordance,
Papillomas of the tracheobronchial tree with malignant degeneration.
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Papillomas are rare tumors of the respiratory tract, which are usually considered benign. We studied a male patient with adult onset of squamous papillomatosis involving both the trachea and the bronchi, with malignant degeneration. When we obtained specimens bronchoscopically, only the bronchial
Searching maximal degenerate motifs guided by a compact suffix tree.
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Compared to a mismatched consensus motif, a degenerate consensus motif is more suitable for modeling position-specific variations within motifs. In the literature, the state-of-art methods using degenerate consensus motifs for de novo motif finding use a naïve enumeration algorithm, which is far
Tree mineral nutrition is deteriorating in Europe.
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The response of forest ecosystems to increased atmospheric CO2 is constrained by nutrient availability. It is thus crucial to account for nutrient limitation when studying the forest response to climate change. The objectives of this study were to describe the nutritional status of the main European
Interlaminar connections of tree shrew visual cortex.
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The intracortical projections of neurons in layers II and upper III of tree shrew visual cortex were studied after terminal lesions in the supragranular layers of area 17. Examination for terminal degeneration was made using ultrastructural techniques. The majority of degenerating terminals were
Tree-structured algorithm for long weak motif discovery.
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BACKGROUND
Motifs in DNA sequences often appear in degenerate form, so there has been an increased interest in computational algorithms for weak motif discovery. Probabilistic algorithms are unable to detect weak motifs while exact methods have been able to detect only short weak motifs. This
Kainic acid-induced terminal degeneration in the dorsal lateral geniculate of tree shrew.
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The dorsal lateral geniculate nucleus of tree shrews is very susceptible to the neurotoxic effects of kainic acid. In addition to neuronal loss, there is a profound loss of retinal terminals that is manifested through a disruption of anterograde transport of WGA/HRP from the retina to the kainic
Fair-balance paradox, star-tree paradox, and Bayesian phylogenetics.
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The star-tree paradox refers to the conjecture that the posterior probabilities for the three unrooted trees for four species (or the three rooted trees for three species if the molecular clock is assumed) do not approach 1/3 when the data are generated using the star tree and when the amount of
Subterranean termites in urban forestry: tree preference and management.
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Urban tree deterioration is a common problem all over the world. Inappropriate plant species choice and inadequate planting may lead to micro and macro organism attacks, such as pests and diseases. Subterranean termite damage is common and may promote tree falls. In order to help urban forestry
Prognostic factors for acute encephalopathy with bright tree appearance.
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OBJECTIVE
To determine the prognostic factors for encephalopathy with bright tree appearance (BTA) in the acute phase through retrospective case evaluation.
METHODS
We recruited 10 children with encephalopathy who presented with BTA and classified them into 2 groups. Six patients with evident
Biological Basis of Tree-Ring Formation: A Crash Course.
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Wood is of crucial importance for man and biosphere. In this mini review, we present the fundamental processes involved in tree-ring formation and intra-annual dynamics of cambial activity, along with the influences of the environmental factors. During wood formation, new xylem cells produced by the
Challenges in Species Tree Estimation Under the Multispecies Coalescent Model.
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The multispecies coalescent (MSC) model has emerged as a powerful framework for inferring species phylogenies while accounting for ancestral polymorphism and gene tree-species tree conflict. A number of methods have been developed in the past few years to estimate the species tree under the MSC. The
[On a family tree with dystrophy-like spinal muscular atrophy (Kugelberg-Welander proximal type)].
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Biomechanical comparison of facet-sparing laminectomy and Christmas tree laminectomy.
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OBJECTIVE
The authors compared differences in biomechanical stability between two decompressive laminectomy techniques for treating lumbar stenosis. A Christmas tree laminectomy (CTL), in which bilateral facetectomies and foraminotomies are performed, was compared with facet-sparing laminectomy
Increase in pulse wavelength causes the systemic arterial tree to degenerate into a classical windkessel.
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Two competing schools of thought ascribe vascular disease states such as isolated systolic hypertension to fundamentally different arterial system properties. The "windkessel school" describes the arterial system as a compliant chamber that distends and stores blood and relates pulse pressure to
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