نتایج جستجو برای: dbh

تعداد نتایج: 1627  

2006
Thomas G. Cole John J. Ewel

Four tree species were harvested periodically over a 13-year period from plantations in the humid lowlands of Costa Rica: Cedrela odorata, Cordia alliodora, Hyeronima alchorneoides, and Euterpe oleracea. The soil was a well-drained, volcanic alluvium, and high fertility coupled with 4 m of annual rainfall and high temperatures led to rapid growth rates; at age 13 many individual were >30 cm dbh...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1979
G Teitelman H Baker T H Joh D J Reis

We sought to determine, in rat embryo, when and at what site in their migration cells derived from the neural crest differentiate into sympathetic neuroblasts. This has been accomplished by immunocytochemical detection, within the cells, of the enzymes catalyzing catecholamine biosynthesis-tyrosine hydroxylase [TH; tyrosine 3-monooxygenase, L-tyrosine, tetrahydropteridine:oxygen oxidoreductase ...

2001
WILLIAM F. LAURANCE G. BRUCE WILLIAMSON PATRICIA DELAMÔNICA ALEXANDRE OLIVEIRA THOMAS E. LOVEJOY CLAUDE GASCON LUCIANO POHL

Little is known about how climatic variability affects fragmented forests and their abrupt edges. We contrasted effects of the 1997 El Niño drought between fragmented and continuous forests in central Amazonia, using long-term data on tree mortality. For 23 permanent 1-ha plots, annualized mortality rates of trees 10 cm diameter at breast height (dbh) were compared among a ‘baseline’ interval o...

Journal: :Remote Sensing 2022

The accurate measurement of diameter at breast height (DBH) is one the essential tasks for biomass estimation an individual tree scale. This paper aims to explore potential unmanned aerial vehicle (UAV) based light detection and ranging (LiDAR) trunk point extraction direct DBH measurement. First, cloud each extracted on UAV LiDAR data by multiscale cylindrical method. Then, directly measured f...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2009
Ai-Jun Li Qing Wang Thu T Dinh Sue Ritter

Previous data have strongly implicated hindbrain catecholamine/neuropeptide Y (NPY) coexpressing neurons as key mediators of the glucoprivic feeding response. Catecholamine/NPY cell bodies are concentrated in the A1 and caudal C1 cell cluster (A1/C1) in the ventrolateral medulla, a region highly sensitive to glucoprivic challenge. To further investigate the importance of this catecholamine subp...

Journal: :American journal of physiology. Heart and circulatory physiology 2007
James E Faber Caroline L Szymeczek Susanna Cotecchia Steven A Thomas Akito Tanoue Gozoh Tsujimoto Hua Zhang

Excessive proliferation of vascular wall cells underlies the development of elevated vascular resistance in hypoxic pulmonary hypertension (PH), but the responsible mechanisms remain unclear. Growth-promoting effects of catecholamines may contribute. Hypoxemia causes sympathoexcitation, and prolonged stimulation of alpha(1)-adrenoceptors (alpha(1)-ARs) induces hypertrophy and hyperplasia of art...

2008
Moses Azong Cho Andrew K. Skidmore Istiak Sobhan

11 12 The objective of this study was to assess the utility of hyperspectral data in 13 estimating and mapping forest structural parameters including mean diameter-at14 breast-height (DBH), mean tree height and tree density of a closed canopy beech 15 forest (Fagus sylvatica L). Airborne HyMap images and data on forest structural 16 attributes were collected from the Majella National Park, Ital...

Journal: :The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society 1997
J C Meltzer P C Grimm A H Greenberg D M Nance

We have developed enhanced immunohistochemical protocols for detecting autonomic nerve fibers and splenocyte-associated proteins in rat spleen. This includes norepinephrine-synthesizing enzymes (dopamine-beta hydroxylase (DBH) and tyrosine hydroxylase (TH)), neuropeptide Y (NPY), tumor necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma), c-fos protein, inducible nitric oxide synthas...

Journal: :Southern Journal of Applied Forestry 2005

Background Attention deficit hyperactivity disorder (ADHD) is a common behavioral disorder that affects 8-12% of school-age children. Several environmental and genetic factors play a role in the etiology of this disease. One of the genetic factors involved is dopamine beta-hydroxylase (DBH) gene, which plays an essential role in catecholamine synthesis by converting dopamine into norepinephrine...

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