Variation in cold hardiness and carbohydrate concentration from dormancy induction to bud burst among provenances of three European oak species   总被引：1，自引：0，他引：1  

Morin X  Améglio T  Ahas R  Kurz-Besson C  Lanta V  Lebourgeois F  Miglietta F  Chuine I 《Tree physiology》2007,27(6):817-825

Although cold hardiness is known to be a major determinant of tree species distribution, its dynamics and the factors that regulate it remain poorly understood. Variation in cold hardiness and carbohydrate concentration, from dormancy induction until bud burst, were investigated in populations of two deciduous (Quercus robur L. and Quercus pubescens Willd.) and one evergreen (Quercus ilex L.) European oak. Mean cold hardiness values in January were -56, -45 and -27 degrees C for Q. robur, Q. pubescens and Q. ilex, respectively. Soluble carbohydrate concentrations were closely related to instantaneous cold hardiness, estimated by the electrolyte leakage method, whereas total carbohydrate concentration was related to maximum cold hardiness. Both cold hardiness and carbohydrate concentration showed a close linear relationship with temperatures at the location of the sampled population. Our results show that temporal variation in both the inter- and intraspecific cold hardiness in European oaks can be related to variations in the concentrations of soluble carbohydrates and that these relationships appear to be driven by temperature.  相似文献   

Chemical and biological assessment of Angelicae Sinensis Radix after processing with wine: an orthogonal array design to reveal the optimized conditions     

Zhan JY  Zheng KY  Zhu KY  Bi CW  Zhang WL  Du CY  Fu Q  Dong TT  Choi RC  Tsim KW  Lau DT 《Journal of agricultural and food chemistry》2011,59(11):6091-6098

The roots of Angelica sinensis [Angelica Sinensis Radix (ASR)] have been used as a common health food supplement for women's care for thousands of years in China. According to Asian tradition, ASR could be processed with the treatment of wine, which subsequently promoted the biological functions of ASR. By chemical and biological assessments, an orthogonal array design was employed here to determine the roles of three variable parameters in the processing of ASR, including oven temperature, baking time, and flipping frequency. The results suggested that oven temperature and baking time were two significant factors, while flipping frequency was a subordinate factor. The optimized condition of processing with wine therefore was considered to be heating in an oven at 80 °C for 90 min with flipping twice per hour. Under the optimized processing conditions, the solubilities of ferulic acid and Z-ligustilide from ASR were markedly increased and decreased, respectively. In parallel, the biological functions of processed ASR were enhanced in both anti-platelet aggregation and estrogenic activation; these increased functions could be a result of the altered levels of ferulic acid and Z-ligustilide in wine-processed ASR. Thus, the chemical and biological assessment of the processed ASR was in full accordance with the Chinese old tradition.  相似文献   

Idiopathic arterial aneurysm/rupture causing sudden death in dairy cattle     

Crawshaw T  Wessels M  Howie F  McElroy M  Patterson T  Peperkamp K  Lamm C 《The Veterinary record》2011,169(10):261

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The prevalence of microalbuminuria and proteinuria in cats with diabetes mellitus     

Al-Ghazlat SA  Langston CE  Greco DS  Reine NJ  May SN  Shofer FS 《Topics in companion animal medicine》2011,26(3):154-157

The prevalence of microalbuminuria (MA) and proteinuria was evaluated in 66 cats with diabetes mellitus (DM), 35 nondiabetic cats with other illness, and 11 healthy nondiabetic cats with use of the E.R.D.-HealthScreen Feline Urine Test. The MA prevalence was higher in the diabetic than in the nondiabetic sick and healthy control cats (70%, 39%, and 18% respectively, P < .0001). In addition, prevalence of proteinuria defined by a protein/creatinine ratio (UPC) > 0.4 was significantly higher in the diabetic cat than in the control cats (70%, 35%, and 9% respectively, P < .0001). There was a significant but weak correlation between the results of MA and UPC (P < .0001, r = 0.43). Our results showed that MA is common in cats with DM. Further studies are required to evaluate the prognostic value of the presence and the severity of MA in cats with DM.  相似文献   

Structures of the bacterial ribosome at 3.5 A resolution   总被引：1，自引：0，他引：1  

Schuwirth BS  Borovinskaya MA  Hau CW  Zhang W  Vila-Sanjurjo A  Holton JM  Cate JH 《Science (New York, N.Y.)》2005,310(5749):827-834

We describe two structures of the intact bacterial ribosome from Escherichia coli determined to a resolution of 3.5 angstroms by x-ray crystallography. These structures provide a detailed view of the interface between the small and large ribosomal subunits and the conformation of the peptidyl transferase center in the context of the intact ribosome. Differences between the two ribosomes reveal a high degree of flexibility between the head and the rest of the small subunit. Swiveling of the head of the small subunit observed in the present structures, coupled to the ratchet-like motion of the two subunits observed previously, suggests a mechanism for the final movements of messenger RNA (mRNA) and transfer RNAs (tRNAs) during translocation.  相似文献   

Evidence for precipitation on Mars from dendritic valleys in the Valles Marineris area     

Mangold N  Quantin C  Ansan V  Delacourt C  Allemand P 《Science (New York, N.Y.)》2004,305(5680):78-81

Dendritic valleys on the plateau and canyons of the Valles Marineris region were identified from Thermal Emission Imaging System (THEMIS) images taken by Mars Odyssey. The geomorphic characteristics of these valleys, especially their high degree of branching, favor formation by atmospheric precipitation. The presence of inner channels and the maturity of the branched networks indicate sustained fluid flows over geologically long periods of time. These fluvial landforms occur within the Late Hesperian units (about 2.9 to 3.4 billion years old), when Mars was thought to have been cold. Our results suggest a period of warmer conditions conducive to hydrological activity.  相似文献   

Changes implemented in Tree Physiology     

Oren R  Kennedy C 《Tree physiology》2011,31(1):i

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Erratum to: Organochloride pesticides in California sea lions revisited     

Burney?J?Le BoeufEmail author  John?P?Giesy  Kurunthachalam?Kannan  Natsuko?Kajiwara  Shinsuke?Tanabe  Cathy?Debier 《BMC ecology》2003,3(1):2

There has been an error in the publication of this paper [1]; the title should read: 'Organochlorine pollutants in California sea lions revisited'.  相似文献   

Organochloride pesticides in California sea lions revisited     

Burney J Le Boeuf  John P Giesy  Kurunthachalam Kannan  Natsuko Kajiwara  Shinsuke Tanabe  Cathy Debier 《BMC ecology》2002,2(1):11-8

Background  

Dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyls (PCBs) are ubiquitous environmental contaminants that have been banned in most countries, but considerable amounts continue to cycle the ecosphere. Top trophic level predators, like sea birds and marine mammals, bioaccumulate these lipophilic compounds, reflecting their presence in the environment.  相似文献   

Urinalysis interpretation: how to squeeze out the maximum information from a small sample     

Reine NJ  Langston CE 《Clinical Techniques in Small Animal Practice》2005,20(1):2-10

The urinalysis is an essential part of the diagnostic evaluation for all urinary and many metabolic diseases. Its assessment includes evaluation of physical characteristics (color, clarity, and volume), biochemical parameters (urine pH, blood, glucose, ketones, bilirubin, urobilinogen, and protein) and microscopic sediment evaluation (RBC, WBC, organisms, epithelial cells, crystals, and casts). Many of these parameters are influenced by collection method and therefore, it is essential to interpret accordingly. Knowledge of factors that can interfere with the accuracy of some test results can decrease improper interpretation. When all of these parameters are evaluated in combination with clinical signs, physical examination, thorough history and other laboratory tests, a diagnosis will often be attained.  相似文献