全文获取类型
收费全文 | 291688篇 |
免费 | 16471篇 |
国内免费 | 722篇 |
专业分类
林业 | 23970篇 |
农学 | 14156篇 |
基础科学 | 2994篇 |
45061篇 | |
综合类 | 37344篇 |
农作物 | 17350篇 |
水产渔业 | 17536篇 |
畜牧兽医 | 119138篇 |
园艺 | 6437篇 |
植物保护 | 24895篇 |
出版年
2020年 | 2930篇 |
2019年 | 3721篇 |
2018年 | 4236篇 |
2017年 | 4659篇 |
2016年 | 4958篇 |
2015年 | 4414篇 |
2014年 | 5783篇 |
2013年 | 16354篇 |
2012年 | 7225篇 |
2011年 | 9417篇 |
2010年 | 7752篇 |
2009年 | 8251篇 |
2008年 | 8800篇 |
2007年 | 7880篇 |
2006年 | 8398篇 |
2005年 | 7597篇 |
2004年 | 7461篇 |
2003年 | 7256篇 |
2002年 | 6541篇 |
2001年 | 7430篇 |
2000年 | 7093篇 |
1999年 | 6364篇 |
1998年 | 4278篇 |
1997年 | 4326篇 |
1996年 | 4048篇 |
1995年 | 4655篇 |
1994年 | 4063篇 |
1993年 | 3831篇 |
1992年 | 5176篇 |
1991年 | 5370篇 |
1990年 | 5088篇 |
1989年 | 5091篇 |
1988年 | 4487篇 |
1987年 | 4635篇 |
1986年 | 4630篇 |
1985年 | 4789篇 |
1984年 | 4272篇 |
1983年 | 4024篇 |
1982年 | 3184篇 |
1981年 | 3105篇 |
1980年 | 3010篇 |
1979年 | 3798篇 |
1978年 | 3289篇 |
1977年 | 3016篇 |
1976年 | 2804篇 |
1975年 | 2754篇 |
1974年 | 3142篇 |
1973年 | 3125篇 |
1972年 | 2904篇 |
1971年 | 2838篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
701.
Corneal diseases are common in domestic rabbits. It is important to carefully evaluate the cornea and the entire eye when rabbit present with clinical signs such as squinting, tearing, or conjunctival hyperemia. Complete ophthalmic examination and general physical examination should be performed on all rabbits with corneal disease. Important diagnostic testing include culture and sensitivity, cytology, and fluorescein staining. Breed predispositions do not occur for most corneal problems, although some diseases are selected genetically in research rabbits. Corneal disease can be a primary condition or can occur secondary to other ocular or systemic disease. 相似文献
702.
对新疆地区啤酒花上的土耳其斯坦叶螨 Tetranychus turkestani Ugarov et Nik-lski 的生物学、发生特点及防治对策进行了初步探讨。该螨寄丰广,为害啤酒花叶片和球果。在啤酒花的毛蕊期和球果生长期有2个发生高峰。本文以啤酒花越冬期,营养生长期、生殖生长期害螨和天敌发生特点,提出了不同的防治方法和技术关键。 相似文献
703.
William R. Widmer DVM MS William E. Blevins DVM MS Samuel Jakovljevic DVM MS Robert F. Teclaw DVM PhD Connie M. Han RVT Cheryl D. Hurd RVT 《Veterinary radiology & ultrasound》1992,33(6):327-333
In a blind clinical trial, adverse effects after iohexol and iopamidol myelography were evaluated in 151 dogs. Eighty-one dogs were given iohexol (240 mgI/ml) and 70 dogs were given iopamidol (200 mgI/ml) by pre-determined assignment. Each dog was evaluated postmyelographically for seizures, hyperthermia, prolonged recovery from anesthesia and intensification of pre-existing neural signs. Myelographic quality was evaluated with a subjective scoring method. In comparing iohexol and iopamidol groups, there was not a statistically significant difference in the incidence of adverse effects or in myelographic quality. Iopamidol and iohexol appeared to be equally efficacious for routine canine myelography. 相似文献
704.
Edwin H. Robinson JamesA. Steeby J. Robert Brent 《Journal of the World Aquaculture Society》1989,20(4):256-260
Two 7 day feeding trials were conducted with channel catfish swim-up fry to evaluate growth, feed conversion ratio, and body composition of fish fed one of the following feeds: salmon starter, catfish starter, or trout starter. Fish fed the salmon or trout starter feeds gained 50–75% more weight, converted feed more efficiently, and had higher body fat stores than fish fed the catfish starter feed. This may be related to the higher protein and energy content of these two feeds. It may be advantageous to feed salmonid starter feeds to hatchery reared catfish fry; however, it is not known whether or not the improved performance observed in the hatchery continues once the fish are stocked into nursery and grow out ponds. 相似文献
705.
N E Forsberg M A Ilian A Ali-Bar P R Cheeke N B Wehr 《Journal of animal science》1989,67(12):3313-3321
The objectives of this study were to examine effects of a beta-adrenergic agonist (cimaterol) on growth and muscle development in rabbits and to examine cimaterol's effects on myofibrillar protein degradation (MPD) and on activities of several proteolytic enzymes including the calcium-dependent proteinases (CDP). Twelve New Zealand White rabbits were assigned to either control diets or to diets containing cimaterol for 35 d, after which they were killed and effects on performance and tissue weight gains were determined. Urine was collected from d 21 through 28 from each rabbit for assessment of N tau-methylhistidine (NMH) excretion. Cimaterol increased rates of gain, efficiency of gain and skeletal muscle weights. Enhancement in muscle weight was associated with an increase in total DNA and with a reduction in NMH. Cimaterol did not affect activities of cathepsin B, cathepsin D or neutral serine proteinase, but it reduced activities of the millimolar and micromolar forms of the CDP by 58 and 57%, respectively, and it reduced activity of the inhibitor of the CDP (calpastatin) by 52%. Cimaterol-dependent myofibrillar protein accretion was likely mediated, at least in part, by a reduction in MPD. The change in MPD was associated with a reduction in muscle CDP activities. Cimaterol-dependent muscle hypertrophy therefore may involve changes in calcium-dependent proteolysis of myofibrillar proteins. The significance of the effects of cimaterol on calpastatin activity is not known. 相似文献
706.
R. A. S. White 《The Journal of small animal practice》1989,30(10):543-549
Sixty-two dogs with laryngeal paralysis were presented over a three year period. Presenting clinical signs included inspiratory stridor (100 per cent), exercise intolerance or syncopal episodes (81 per cent), loss or alteration in phonation (48 per cent) and coughing or gagging when eating (29 per cent). Causes of the paralysis were determined as traumatic (two dogs), neoplastic (two dogs), iatrogenic (two dogs), congenital (one dog) and idiopathic (55 dogs). Unilateral arytenoid lateralisation was performed in all dogs. The perioperative complication rate was approximately 10 per cent, while the success rate as judged by owners one year postoperatively was greater than 90 per cent. The technique avoided many of the recorded complications of intralaryngeal surgery. Operative times were short and the requirement for postoperative monitoring was minimal. Increasing familiarity with the technique favourably influenced the incidence of complications and the success rate. 相似文献
707.
J. C. Scott-Moncrieff G. S. Elliott A. Radoveky W. E. Blevins 《The Journal of small animal practice》1989,30(12):696-699
A 14-year-old domestic shorthaired cat was presented because of swelling of the digits and lameness. A solitary lung mass was observed on thoracic radiographs. Clinical and pathological evaluation confirmed a primary pulmonary squamous cell carcinoma metastatic to a single digit on each foot. Other metastatic lesions were present in the left popliteal lymph node and in the left iliac vein. 相似文献
708.
M. C. HAMPSON 《EPPO Bulletin》1989,19(3):425-429
Research includes studies on germination of resting spores, substances affecting infection, eradication, bioassay for Synchytrium endobioticum, and sub-surface vectoring of the fungus. The sequence of events in germination has been exposed and the mechanisms of germination are currently being studied. Chitin and in particular crabshell induce zero infection, and there is promise in using these materials as eradicants. Using the bioassay so far developed, it is possible to assay for 0.1 spore per g of soil. There is evidence that the fungus can migrate in soil through the agency of vector animals. Problems long posed by this disease now seem soluble. 相似文献
709.
Summary Crystallization experiments starting from highly concentrated solutions of cellulose in trifluoroacetic acid (TFA) resulted
in white crystalline particles with diameters of as much as 0.5 mm. The plate-like particles consist of lamellae arranged
perpendicular to the surface. The lamellae are grown from thin scale-like platelets showing clear diffraction reflexes and
an internal parallel structure. Parallel structures were also detected in partially hydrolyzed cellulose. It is concluded
that cellulose chains of low DP tend to rearrange themselves by a side by side accumulation of extended molecules. 相似文献
710.
Three strip test kits which measure calcium and/or magnesium in mares' mammary secretions were compared and assessed for their accuracy in:- 1) measuring these electrolytes compared to standard laboratory measurements, and 2) predicting the time of parturition. Daily samples of mammary secretions were obtained pre-partum from 35 Thoroughbred mares and allocated a score. Measurement of mammary secretion calcium and/or magnesium by the strip tests and laboratory methods correlated significantly (P less than 0.001). The results obtained for prediction of parturition were analysed by two methods. Method i) indicated that the majority of mares had a maximum score on the day of birth. However, the second method of analysis included all prepartum scores and this demonstrated that maximum scores occurred on more occasions prior to the day of birth than on the day of birth itself. The number of nights spent attending mares, and the percentage of occasions when foaling was missed, were also calculated for given strip test scores. The results indicate that the test kits are not particularly accurate in predicting time of parturition although they are a reliable means of measuring mammary secretion calcium and/or magnesium. It is suggested that the test kits may be more helpful by indicating when it is not necessary to attend mares at night. 相似文献