鄂伦春旗林业产业发展的战略思考     

张秋菊  于秀丽  吴迪 《内蒙古林业调查设计》2005,28(Z1):135-137

文章介绍了鄂伦春旗林业产业发展的现状:主要成效、存在问题,影响因素,林业产业发展的前景、地位和作用,林业产业发展的思路与目标及措施等。  相似文献   

新亚欧大陆桥经济带沙区土地利用及环境变迁的时空分析模型     

岳天祥  孔德涌  狄昂照 《世界林业研究》1994,7(4):68-74

本文分析了新亚欧大陆桥经济带及其沙区的发展问题，介绍了国内外对沙漠土地的研究与利用情况，提出了新亚欧大陆桥沙区的经济模式和土地利用及环境变迁的时空分析模型。  相似文献   

Cytotoxic activity of the root extract from Myoschilos oblongum     

Piovano M  Chamy MC  Garbarino JA  Tita B  Vitalone A  Di Fabio A  Nicoletti M 《Fitoterapia》2003,74(5):497-500

The crude methanolic root extract of Myoschilos oblongum exhibited a significant cytotoxic activity against PZ-HPV-7 human prostate cells. Furthermore, two esters of docosanol were isolated from the CH(2)Cl(2) extract.  相似文献   

DIAGNOSTIC SENSITIVITY OF ULTRASOUND,RADIOGRAPHY AND COMPUTED TOMOGRAPHY FOR GENDER DETERMINATION IN FOUR SPECIES OF LIZARDS          下载免费PDF全文

Francesco Di Ianni  Antonella Volta  Igor Pelizzone  Sabrina Manfredi  Giacomo Gnudi  Enrico Parmigiani 《Veterinary radiology & ultrasound》2015,56(1):40-45

Gender determination is frequently requested by reptile breeders, especially for species with poor or absent sexual dimorphism. The aims of the current study were to describe techniques and diagnostic sensitivities of ultrasound, radiography, and computed tomography for gender determination (identification of hemipenes) in four species of lizards. Nineteen lizards of known sex, belonging to four different species (Pogona vitticeps, Uromastyx aegyptia, Tiliqua scincoides, Gerrhosaurus major) were prospectively enrolled. With informed owner consent, ultrasound, noncontrast CT, contrast radiography, and contrast CT (with contrast medium administered into the cloaca) were performed in conscious animals. Imaging studies were reviewed by three different operators, each unaware of the gender of the animals and of the results of the other techniques. The lizard was classified as a male when hemipenes were identified. Nineteen lizards were included in the study, 10 females and nine males. The hemipenes were seen on ultrasound in only two male lizards, and appeared as oval hypoechoic structures. Radiographically, hemipenes filled with contrast medium appeared as spindle‐shaped opacities. Noncontrast CT identified hemipenes in only two lizards, and these appeared as spindle‐shaped kinked structures with hyperattenuating content consistent with smegma. Hemipenes were correctly identified in all nine males using contrast CT (accuracy of 100%). Accuracy of contrast radiography was excellent (94.7%). Accuracy of ultrasound and of noncontrast CT was poor (64.3% and 63.1%, respectively). Findings from the current study supported the use of contrast CT or contrast radiography for gender determination in lizards.  相似文献   

Relationship between three novel SNPs of BRCA1 and canine mammary tumors     

Weidong SUN  Xu YANG  Hengbin QIU  Di ZHANG  Huanan WANG  Jian HUANG  Degui LIN 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(11):1541-1543

The BRCA1 gene plays an important role in the development of human breast cancer, and recent research indicated that genetic variations of BRCA1 are also related to canine mammary tumors (CMTs). Here, using rapid amplification of cDNA ends (RACE), we cloned the 5′- and 3′-UTRs of BRCA1. By direct sequencing of the flanking sequences of the 5′- and 3′-UTRs of BRCA1, three previously unreported single-nucleotide polymorphisms (SNPs) were identified, two (−1228T >C, −1173C >T) in the putative promoter regions and one non-synonymous SNP (63449G >A) in exon 23. Compared with 16 normal samples, the sequences from 34 CMTs suggested that SNP (−1173C >T) was associated with the development of CMTs (odds ratio (OR)=2.57, 95% confidence interval (CI): 1.07–6.15).  相似文献   

Influence of race and crossbreeding on casein micelles size          下载免费PDF全文

Denise R. Freitas  Leorges M. Fonseca  Fernando N. Souza  Cristiane V. G. Ladeira  Soraia A. Diniz  João Paulo A. Haddad  Diêgo S. Ferreira  Mônica M. O. P. Cerqueira 《Animal Science Journal》2015,86(5):553-556

Casein (CN) micelles are colloidal aggregates of protein dispersed in milk, the importance of which in the dairy industry is related to functionality and yield in dairy products. The objective of this work was to investigate the correlation of milk CN micelles diameter from Holstein and Zebu crossbreds with milk composition (protein, fat, lactose, total and nonfat solids and milk urea nitrogen), somatic cell count (SCC), age, lactation stage and production. Average casein micelles diameters of milk samples obtained from 200 cows were measured using photon correlation spectroscopy and multiple regression analysis was used to find relationship between variables. CN micelle diameter, SCC and nonfat solids were different between animals with different Holstein crossbreed ratios, which suggests influence of genetic factors, mammary gland health and milk composition. Overall, results indicate the potential use of CN micelle diameter as a tool to select animals to produce milk more suitable to cheese production.  相似文献   

Assessment of coagulation utilizing thromboelastometry in dogs undergoing orthopedic surgery          下载免费PDF全文

Barbara Bruno DVM  Cristiana Maurella DVM  Sara Falco DVM  Alberto Tarducci DVM  Renato Zanatta DVM  PhD  Paola Gianella DVM  PhD  DACVIM  Antonio D'Angelo DVM  PhD  DECVN  DECBHM  Lisa Piras DVM  PhD  Andrea Di Bella DVM  MRCVS  Antonio Borrelli DVM  PhD  MS 《Journal of Veterinary Emergency and Critical Care》2015,25(3):358-363

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关岭牛MyoD Ⅰ基因在不同组织和时期中的表达分析     

桓聪聪  许厚强  陈伟  陈祥  赵佳福  张雯  周迪  夏丹 《中国畜牧兽医》2015,42(4):782-788

为研究MyoDⅠ基因在关岭牛不同组织表达量的差异及在肌肉发育过程中的表达情况,试验采用实时荧光定量PCR技术对关岭牛背最长肌、大腿肌、心脏、肝脏、脂肪、小肠6个组织的MyoDⅠ基因相对表达量进行检测。同时分析关岭牛胎儿、18月龄、30月龄时期背最长肌组织中MyoDⅠ基因的表达规律。结果显示,MyoDⅠ基因在背最长肌中表达量最高,在出生后的关岭牛肌肉组织中也具有较高的表达量,且随着出生时间的推移呈上升趋势。推测可能由于背最长肌是肌肉富集地方,因此基因表达量较高,随着年龄增大,肌肉丰满度增加,基因表达量也随着增加。  相似文献   

A disaggregated dynamic model for predicting volume,biomass and carbon stocks in even-aged pedunculate oak stands in Galicia (NW Spain)     

Esteban Gómez-García  Felipe Crecente-Campo  Marcos Barrio-Anta  Ulises Diéguez-Aranda 《European Journal of Forest Research》2015,134(3):569-583

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曲轴摆缸式阀配流水液压马达工作特性研究     

满家祥  赵继云  王云飞  黄笛  刘磊  于鸣泉 《农业机械学报》2023,54(1):450-458

为解决盘配流和轴配流低速大扭矩水液压马达配流副存在的磨损和泄漏问题,提出一种新型阀配流结构的低速大扭矩水液压马达,柱塞配流通过配流凸轮控制配流阀的通断实现。研究柱塞运动学规律和马达输出扭矩形成,揭示配流阀推杆位移、阀芯通断、柱塞进回液间的对应关系,分析马达角排量波动随转角、结构设计参数K的变化规律,当结构设计参数K为0.13时,马达输出扭矩波动率为6.59%。在AMESim中建立了配流阀及单柱塞配流过程的仿真模型,分析配流阀的工作特性及单柱塞动态配流性能,工作中配流阀产生最大压降为0.08MPa,进/回液配流阀无高低压串液。为验证阀配流结构在水液压马达中的工作性能,建立阀配流单柱塞试验台,并研究不同工况下的配流工作特性。试验结果表明,配流阀在马达转速0~60r/min、压力0~21MPa的工况下稳定配流,进液阀口压力在柱塞腔进回液转换时存在瞬间小幅压力波动,但对配流过程基本无影响,阀配流结构能够满足曲轴摆缸式马达柱塞的配流需求,为低速大扭矩水液压马达的配流提供了思路。  相似文献