Comment on "Lévy walks evolve through interaction between movement and environmental complexity"     

Jansen VA  Mashanova A  Petrovskii S 《Science (New York, N.Y.)》2012,335(6071):918; author reply 918

de Jager et al. (Reports, 24 June 2011, p. 1551) concluded that mussels Lévy walk. We confronted a larger model set with these data and found that mussels do not Lévy walk: Their movement is best described by a composite Brownian walk. This shows how model selection based on an impoverished set of candidate models can lead to incorrect inferences.  相似文献   

Secreted kinase phosphorylates extracellular proteins that regulate biomineralization     

Tagliabracci VS  Engel JL  Wen J  Wiley SE  Worby CA  Kinch LN  Xiao J  Grishin NV  Dixon JE 《Science (New York, N.Y.)》2012,336(6085):1150-1153

Protein phosphorylation is a fundamental mechanism regulating nearly every aspect of cellular life. Several secreted proteins are phosphorylated, but the kinases responsible are unknown. We identified a family of atypical protein kinases that localize within the Golgi apparatus and are secreted. Fam20C appears to be the Golgi casein kinase that phosphorylates secretory pathway proteins within S-x-E motifs. Fam20C phosphorylates the caseins and several secreted proteins implicated in biomineralization, including the small integrin-binding ligand, N-linked glycoproteins (SIBLINGs). Consequently, mutations in Fam20C cause an osteosclerotic bone dysplasia in humans known as Raine syndrome. Fam20C is thus a protein kinase dedicated to the phosphorylation of extracellular proteins.  相似文献   

Going to bat for an endangered species     

Florens FB 《Science (New York, N.Y.)》2012,336(6085):1102

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Electroporation improves the immune response induced by a DNA vaccine against pseudorabies virus glycoprotein B in pigs     

Le Moigne V  Cariolet R  Béven V  Keranflec'h A  Jestin A  Dory D 《Research in veterinary science》2012,93(2):1032-1035

This study was performed to determine whether electroporation can be used to enhance the efficacy of a DNA vaccine against pseudorabies virus (PrV) in pigs. Immune responses to PrV were measured in pigs following a single intramuscular injection of plasmids encoding PrV glycoprotein B, with or without electroporation. Plasmid injection coupled with electroporation increased production of specific antibodies against PrV and peripheral blood mononuclear cells proliferated in response to stimulation with PrV glycoproteins. These results show that electroporation can improve the performance of a DNA vaccine against PrV in pigs. However, additional work is required to maximise the effectiveness of the vaccination protocol.  相似文献   

Good quality chicks from disinfected eggs     

Vincent Turblin  CEVA Animal Health 《国外畜牧学(猪与禽)》2012,32(7)

目前,良好的清洗和消毒被广泛地认为是孵化场优化1日龄苗鸡(Day Old Chick,DOC)生产的一种措施.良好的种蛋卫生已证明可提高DOC的存活率和质量.事实上,细菌通过蛋壳侵入种蛋的强穿透能力会影响孵化质量的诸多方面,如早期胚胎死亡率、蛋黄感染、出壳前的DOC死亡率,除此之外还有第1周中苗鸡极高的死亡率和不均匀性.  相似文献   

Improved water repellency of black spruce wood surfaces after treatment in carbon tetrafluoride plasmas   总被引：1，自引：0，他引：1  

Bouddah Poaty  Bernard Riedl  Pierre Blanchet  Vincent Blanchard  Luc Stafford 《Wood Science and Technology》2013,47(2):411-422

Plasma treatments for black spruce wood (Picea mariana (Mill.) B.S.P.), a widespread forest species from Canada, were carried out in order to waterproof the exposed surfaces. Experiments were performed using inductively coupled argon plasma with carbon tetrafluoride as the gaseous precursor for plasma-enhanced chemical vapor deposition of functional fluoropolymer coatings on wood. Analysis of the wettability through water contact angle measurements showed water-repellent characteristics, with static contact angles up to 130° depending on plasma exposure time, CF₄ concentration in the Ar/CF₄ plasma, and plasma source-to-substrate distance. X-ray photoelectron spectroscopy investigations of plasma-treated wood surfaces confirmed the growth of a thin, fluorocarbon layer with fluorine atomic concentrations close to 50 % on highly hydrophobic wood surfaces. Estimation of the thickness of the coatings by stylus profilometry revealed that a minimum layer thickness of about 80 nm is required to obtain water repellant wood surfaces with minimum water uptake. This complete set of data indicates that fluorocarbon-containing plasmas represent a very promising approach for improving the durability of wood products in wet and humid conditions.  相似文献   

The influence of the tracer injection–acquisition interval on the distribution of 99mTc-ECD in the brain of laboratory cats     

Tim Waelbers  Kathelijne Peremans  Simon Vermeire  André Dobbeleir  Vincent Boer  Hendrik de Leeuw  Maarten Vente  Koen Piron  Myriam Hesta  Ingeborgh Polis 《Journal of Veterinary Behavior: Clinical Applications and Research》2013,8(6):444-449

Single-photon emission computed tomography (SPECT) can be used to study the regional distribution of the cerebral blood flow in the feline brain without interference of anesthetics. When the tracer, ^99mtechnetium-ethyl cysteinate dimer (^99mTc-ECD), is injected in the awake animal, the acquisition can be performed afterward under general anesthesia, whereas the tracer distribution still represents the regional cerebral blood flow (rCBF) in the awake animal. The aim of this study was to look at the in vivo stability of ^99mTc-ECD in the feline brain. For this purpose, 6 cats (n = 6) were used, and 3 serial acquisitions were performed starting at 40 (T40), 60 (T60), and 85 (T85) minutes after tracer injection. Total counts and perfusion indices (PIs), normalized to the total brain and to the cerebellum, were calculated. When T85 was compared with T40, total counts decreased, depending on the brain region, with 29% (left thalamus) to 51% (bulbus olfactorius). These regional differences in tracer clearance resulted in significantly altered PIs at T85 as compared with T40. This study shows that ^99mTc-ECD SPECT can be used in cats for studying the rCBF and that the clearance of ^99mTc-ECD in the feline brain is region dependent. As a result, the acquisition should be started between 40 and 60 minutes after tracer injection.  相似文献   

Aeta Magbukún of Mariveles: Traditional Indigenous Forest Resource Use Practices and the Sustainable Economic Development Challenge in Remote Philippine Regions     

Vincent S. Balilla  Julia Anwar-McHenry  Mark P. McHenry  Riva Marris Parkinson  Danilo T. Banal 《Journal of Sustainable Forestry》2013,32(7):687-709

The Aeta Magbukún of Mariveles are one of the least known and researched Indigenous peoples remaining on the fringe of the bay, and within the remaining forests in Bataan province on Luzon Island in the Philippines. This work describes the unique cultural systems and language of the Aeta Magbukún tribe in Biaan, Mariveles, and both the traditional forest resource use and the evolving new subsistence practices developed to adapt to the encroachment of non-Indigenous peoples onto ancestral lands. The Aeta's forest resource use practices are discussed from a sustainable Indigenous development context within unique socioeconomic, cultural, and environmental circumstances in Bataan.  相似文献   

Effect of shade on biomass accumulation and partitioning for Eucalyptus camaldulensis sprouts     

Ciro Abbud Righi  Vincent S. J. A. Couderc  Carlos Rodrigues Pereira  Hilton Thadeu Zarate do Couto  Luciana Duque Silva 《Journal of Sustainable Forestry》2013,32(1):75-87

ABSTRACT

Eucalyptus is widely cultivated in homogeneous monocultures throughout the world alongside plants of the same age. Furthermore, the productivity of forest stands is highly dependent on how solar radiation is intercepted and used. Meanwhile, it is possible to consider cultivating trees of different ages in the same area, and thus under different regimes of available solar radiation, creating a sequence of plantings and harvestings and to develop Eucalyptus-based agroforestry systems. We have examined biomass accumulation of Eucalyptus camaldulensis along a shade gradient. Eucalyptus trees presented power-law responses to increasing irradiance for biomass, indicating it has low plasticity and is unable to maintain growth under lower irradiance levels. Biomass partitioning showed no dependence on available irradiation. Leaf density presented very little increase toward sunnier places meaning that an increment in Eucalyptus biomass would be mostly due to its increase in size and thus higher radiation interception. Careful management of shade will be a key consideration for the integration of Eucalyptus into agroforestry. With knowledge of the growth habits of different species, we will have the potential to propose more perennial ways in which to manage land and reduce anthropogenic disturbances by avoiding clear-cuts of areas that removes all plant structures.  相似文献   

Genuine concurrent muscular subvalvular subaortic stenosis and muscular infundibular stenosis of the right ventricle in the heart of the pig     

C. J. van Nie  J. Vincent 《The Veterinary quarterly》2013,33(3):160-165

Summary

Two cases of genuine concurrent muscular subvalvular aortic and muscular infundibular pulmonary stenosis in pigs are reported. The character of this morphophy‐siological syndrome is discussed.

The morphology of the heart of the pig predisposes this animal to the syndrome.  相似文献