全文获取类型
收费全文 | 56178篇 |
免费 | 2813篇 |
国内免费 | 5600篇 |
专业分类
林业 | 6050篇 |
农学 | 8227篇 |
基础科学 | 4724篇 |
8487篇 | |
综合类 | 15018篇 |
农作物 | 2674篇 |
水产渔业 | 1977篇 |
畜牧兽医 | 12346篇 |
园艺 | 1668篇 |
植物保护 | 3420篇 |
出版年
2024年 | 153篇 |
2023年 | 603篇 |
2022年 | 1420篇 |
2021年 | 2136篇 |
2020年 | 2055篇 |
2019年 | 1934篇 |
2018年 | 1473篇 |
2017年 | 1966篇 |
2016年 | 1860篇 |
2015年 | 2557篇 |
2014年 | 2445篇 |
2013年 | 2975篇 |
2012年 | 3387篇 |
2011年 | 3650篇 |
2010年 | 3405篇 |
2009年 | 3263篇 |
2008年 | 2922篇 |
2007年 | 2857篇 |
2006年 | 2756篇 |
2005年 | 2726篇 |
2004年 | 1337篇 |
2003年 | 1137篇 |
2002年 | 995篇 |
2001年 | 1032篇 |
2000年 | 1149篇 |
1999年 | 1465篇 |
1998年 | 1367篇 |
1997年 | 1189篇 |
1996年 | 1101篇 |
1995年 | 1033篇 |
1994年 | 1009篇 |
1993年 | 925篇 |
1992年 | 887篇 |
1991年 | 730篇 |
1990年 | 670篇 |
1989年 | 522篇 |
1988年 | 377篇 |
1987年 | 333篇 |
1986年 | 149篇 |
1985年 | 152篇 |
1984年 | 134篇 |
1983年 | 117篇 |
1982年 | 72篇 |
1981年 | 32篇 |
1980年 | 31篇 |
1979年 | 10篇 |
1978年 | 12篇 |
1977年 | 12篇 |
1965年 | 9篇 |
1963年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
952.
ObjectivesTo determine normal resting values for cardiac troponin I (cTnI) in healthy Standardbred, Thoroughbred and Warmblood horses and investigate if racing has an influence on cTnI concentrations.BackgroundMeasuring cTnI concentrations in plasma is the gold standard for detecting myocardial injury in humans. Cardiac troponin I is highly conserved between species and has gained interest as a marker for cardiac injury in horses. Increased levels of cTnI have been reported in association with endurance and short-term strenuous exercise on a treadmill in horses. However, the effect of true racing conditions has not yet been reported.Animals, materials and methodsBlood samples for analysis of cTnI concentrations in plasma were collected from 67 Standardbred racehorses, 34 Thoroughbred racehorses and 35 Warmblood dressage horses at rest. Blood samples were also collected prior to and after racing in 22 Standardbred racehorses and 6 Thoroughbred racehorses.ResultsAll horses except one had resting plasma cTnI concentrations <0.022 μg/L. Mild increases in cTnI concentrations were seen in some horses 1–2 h after the race (1/17 Standardbreds and 2/6 Thoroughbreds) as well as 10–14 h after the race (4/21 Standardbreds and 1/6 Thoroughbreds).ConclusionsResting cTnI concentrations in horses are low but mildly elevated cTnI concentrations may be detected in some horses 1–14 h after racing. These findings could be of importance when evaluating horses with suspected cardiac disease that recently have performed hard exercise. 相似文献
953.
Melinda H. MacDonald DVM PhD Anthony M. Tesch BS Hilary P. Benton PhD Neil H. Willits PhD 《Journal of Equine Veterinary Science》2002,22(1)
Objective: To characterize the impact of age, gender, location and individual animal variation on the composition of articular cartilage from the metacarpophalangeal joint of horses. Design: Cartilage specimens were obtained from the metacarpophalangeal joints of 28 male, female and castrated male horses ranging in age from one day to 27 years of age. Cartilage samples from the distal metacarpus, proximal first phalanx and proximal sesamoids were analyzed separately. Chondrocyte number, DNA content, proteoglycan concentration and total collagen content were determined for each animal and joint location. Results: Age and joint location had a significant effect on chondrocyte number and DNA content with higher cell counts and DNA content detected in cartilage from the youngest age groups and in cartilage from the metacarpus and proximal sesamoids. The influence of age on chondrocyte numbers was not significant in horses over two years of age. Both age and joint location also influenced total proteoglycan and collagen content. Lower proteoglycan and collagen concentrations were detected in younger horses, and cartilage from the metacarpus had lower proteoglycan and collagen concentrations than that from other joint locations. Gender did not appear to influence chondrocyte number or matrix content of equine articular cartilage. However, there was significant residual variation in cellularity, proteoglycan levels and collagen content between individual animals that could not be explained by the signalment factors considered in this study. Conclusions: Future studies examining equine articular cartilage should avoid direct morphologic comparisons between animals of different ages, and any comparisons made between individuals should be interpreted cautiously. In addition, in vitro tissue culture models should avoid the use of cartilage pooled from different animals or from different locations within the same joint. 相似文献
954.
955.
956.
[目的]估计莱西市奶牛布鲁氏菌病的流行率和地理分布,分析奶牛养殖场间布鲁氏菌病的传播风险因素。[方法]对莱西市1803个养殖户30119头应检奶牛,全部采样,采用虎红平板凝集和试管凝集垂直试验,同时开展奶牛布鲁氏菌病问卷调查。利用GIS、Epi Infor TM 7和SPASS软件,开展横断面研究和case-control研究,分析莱西市奶牛布鲁氏菌病阳性场户的空间分布、布鲁氏菌病流行率和养殖场间的风险因素分析。[结果]莱西市布鲁氏菌病的场户血清流行率是2.55%,个体血清流行率为0.38%;单因素分析发现存栏量、养殖模式、养殖环境、是否有专用产犊场地、挤奶方式、运奶方式、粪污是否分开处理、是否使用机械处理粪便等8个因素与奶牛布鲁氏菌病发生有一定关系(p<0.2);多因素logistic回归分析表明,存栏量少(10只以下)(OR=4.58,95%CI:1.87-11.23,p=0.001)和散养户集中村饲养(OR=2.21,95%CI:1.05-4.63,p=0.036)与该病发生相关。 相似文献
957.
Imogen C. Johns BVSc DACVIM Anne Desrochers DVM DACVIM Kathryn L. Wotman DVM DACVIM Raymond W. Sweeney VMD DACVIM 《Journal of Veterinary Emergency and Critical Care》2011,21(3):273-278
Objective – To describe the clinical presentation, case management, and outcome in 2 foals with Rhodococcus equi infection associated with presumptive severe immune‐mediated hemolytic anemia. Series Summary – Two foals diagnosed with R. equi pneumonia on the basis of tracheal wash cultures, thoracic radiographs, and thoracic ultrasonography were concurrently diagnosed with hemolytic anemia. Both foals required whole blood transfusions, and were treated with the antimicrobial combination of rifampin and a macrolide (eg, clarithromycin, erythromycin, or azithromycin). Dexamethasone was used to prevent further hemolysis in both foals, and to treat acute lung injury/acute respiratory distress syndrome in 1 of the foals. Both foals survived, and required prolonged antimicrobial therapy. New or Unique Information Provided – Although extra‐pulmonary disorders are commonly diagnosed in foals infected with R. equi, hemolytic anemia is rarely described. Dexamethasone is considered the treatment of choice for immune‐mediated hemolytic anemia, but may be contra‐indicated in foals with severe bacterial infections. In these foals, a relatively low dose and short duration of dexamethasone was utilized in an attempt to minimize immune suppression, although early discontinuation in 1 foal precipitated a second hemolytic crisis. 相似文献
958.
959.
完善有效的法规体系,是美、欧、澳根除牛结核病等动物疫病的基础保障。其要点主要包括:健全法律制度,强化财政支持,减少利益方抵触行为;规范检测方法,对屠宰牛进行全部检疫;对阳性牛实施严格追溯制度,并分类实施标识制度;建立病牛扑杀的基本标准,选择性采取扑杀措施;推行区域化管理制度,建立差异性市场准入标准;实施野生动物隔离及监测制度,防止野生动物向家养动物传播疫情;强化利益方的宣传教育,营建群防群控氛围。这些策略和措施,对我国健全结核病防治策略具有一定借鉴意义。 相似文献
960.
Intracavitary Cisplatin Chemotherapy Experience with Six Dogs 总被引:1,自引:0,他引:1
Antony S. Moore MVSc Claudia Kirk DVM Aglaia Cardona DVM 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1991,5(4):227-231
Six dogs with a median age of 7 years (range = 5-14 years) were presented for signs referable to thoracic or abdominal effusion associated with neoplasia of the body cavities. Intracavitary cisplatin was administered at 50 mg/m2 every 4 weeks for a median of 2.5 treatments (mean = 3, range = 1-6). Three dogs with pleural mesothelioma had complete resolution of effusion for 289, 129, and greater than 306 days without evidence of tumor growth. Resolution of effusion occurred after one treatment in two dogs and after two treatments in one dog. In three dogs with carcinomatosis of unknown origin, complete responses was seen in two dogs after one treatment for 255 and greater than 807 days, respectively. Intracavitary chemotherapy with cisplatin was associated with palliation and control of malignant pleural and/or abdominal effusion in five of six dogs. Toxicity was minimal, and this method of therapy should be further explored in dogs with similar malignancies. 相似文献