全文获取类型
收费全文 | 6916篇 |
免费 | 288篇 |
国内免费 | 22篇 |
专业分类
林业 | 254篇 |
农学 | 357篇 |
基础科学 | 85篇 |
860篇 | |
综合类 | 442篇 |
农作物 | 258篇 |
水产渔业 | 202篇 |
畜牧兽医 | 3775篇 |
园艺 | 123篇 |
植物保护 | 870篇 |
出版年
2023年 | 31篇 |
2022年 | 46篇 |
2021年 | 64篇 |
2020年 | 83篇 |
2019年 | 93篇 |
2018年 | 104篇 |
2017年 | 111篇 |
2016年 | 121篇 |
2015年 | 98篇 |
2014年 | 143篇 |
2013年 | 511篇 |
2012年 | 310篇 |
2011年 | 375篇 |
2010年 | 196篇 |
2009年 | 208篇 |
2008年 | 346篇 |
2007年 | 334篇 |
2006年 | 281篇 |
2005年 | 280篇 |
2004年 | 296篇 |
2003年 | 258篇 |
2002年 | 255篇 |
2001年 | 239篇 |
2000年 | 221篇 |
1999年 | 198篇 |
1998年 | 54篇 |
1997年 | 56篇 |
1996年 | 57篇 |
1995年 | 64篇 |
1994年 | 38篇 |
1993年 | 46篇 |
1992年 | 108篇 |
1991年 | 116篇 |
1990年 | 135篇 |
1989年 | 111篇 |
1988年 | 100篇 |
1987年 | 84篇 |
1986年 | 67篇 |
1985年 | 71篇 |
1984年 | 66篇 |
1983年 | 44篇 |
1982年 | 30篇 |
1981年 | 41篇 |
1980年 | 44篇 |
1979年 | 45篇 |
1975年 | 25篇 |
1974年 | 25篇 |
1973年 | 26篇 |
1972年 | 35篇 |
1971年 | 32篇 |
排序方式: 共有7226条查询结果,搜索用时 15 毫秒
71.
Hormonal responses to acute exercise, training and overtraining. A review with emphasis on the horse 总被引:1,自引:0,他引:1
de Graaf-Roelfsema E Keizer HA van Breda E Wijnberg ID van der Kolk JH 《The Veterinary quarterly》2007,29(3):82-101
Overtraining is an imbalance between training and recovery leading to symptoms associated with a neuroendocrine dysbalance called the overtraining syndrome, a disease characterized by behavioral, emotional and physical symptoms similar with depression. Although the prevalence of overtraining is high in human and equine athletes, at present no sensitive and specific test is available to prevent or diagnose overtraining. Nowadays, it is believed that combination of different (hormonal) parameters appear to be the best indicators of overtraining. Therefore, this review provides a summary of previous literature examining the response of the hypothalamic-pituitary-adrenal (HPA) axis and the growth hormone-insulin-like growth factor-I (GH-IGF-I) axis to acute and chronic exercise as well as overtraining in humans and horses. The exercise induced hormonal responses seem to be equal for the equine as well as the human athlete, which makes comparisons possible. Repeated bouts of exercise are suggested to provide a way to detect subtle changes in hormonal responses in the individual athlete, which may make them an important tool in detecting early overtraining. This should be combined with corticotropin releasing hormone (CRH) stimulation tests and basal ACTH and GH pulsatility determination. Further research is needed to establish the correct training intensity and rest period for the exercise test in equines. 相似文献
72.
Instructions on how to debone and stuff a turkey are available, but what is the best way to close it up? A randomised trial involving 15 turkeys was performed in order to evaluate skin disruption scores and cosmetic outcomes following the use of different suture patterns. Turkeys were deboned, stuffed and cooked according to guidelines of the US Department of Agriculture Food Safety and Inspection Services. After stuffing, they were randomly assigned to one of five closure groups: simple continuous Lembert; simple continuous Cushing; simple continuous Utrecht; simple continuous; or staples. Turkeys were cooked at 180 °C for two hours ensuring core temperature reached 75 °C. Suture line integrity was evaluated after removal of the sutures and the cosmetic aspect was graded. Before cooking, the Utrecht pattern and skin staples offered the best cosmetic result. After removal of the sutures, the skin remained intact only in the stapled group. All other suture patterns disrupted the skin after removal of the sutures, rendering the turkey less cosmetically appealing for serving. Closure of a stuffed turkey was best performed using skin staples to achieve the best cosmetic results. Using this technique you will be able to impress family and friends at a Christmas dinner, and finally show them your surgical skills. 相似文献
73.
A two-month-old female Tibetan terrier was re-presented with an incomplete closure of the patent ductus arteriosus. Following a second attempt to close the shunt by coil embolisation, arterial embolisation occurred. The successful removal of the embolised coil is described. 相似文献
74.
75.
Kovalik M Thoday KL Evans H van den Broek AH Mellanby RJ 《Veterinary journal (London, England : 1997)》2012,192(2):212-216
The aim of this study was to assess the effects of a standard therapeutic protocol of prednisolone (Pred) on glucose homeostasis in atopic dogs and compare it with previously published data for ciclosporin A (CsA). The central aim of the study was to assess and compare the effects of standard therapeutic protocols of prednisolone (Pred) and ciclosporin A (CsA) on glucose homeostasis in dogs with atopic dermatitis (CAD). Both treatments significantly reduced the physical signs of CAD, as determined by the canine atopic dermatitis extent and severity index version 3 (CADESI-03) and the Edinburgh Pruritus Scale (EPS). Post-treatment plasma glucose concentrations were not significantly different in the two groups, but serum insulin concentrations were significantly higher following Pred therapy (P<0.05). Serum fructosamine concentrations were not significantly different pre- and post-treatment with Pred, although previous studies had shown that CsA treatment increased fructosamine concentrations (P<0.005). The two treatment groups were recruited in a similar timeframe, were numerically matched and there were no differences in CADESI-03 and EPS scores between the CsA and Pred groups either before or after treatment. Thus, both CsA and Pred treatment were associated with mild disturbances in glucose metabolism, but only CsA therapy resulted in a significant increase in fructosamine concentrations. This information may be relevant to clinicians when considering therapeutic options for dogs with atopic dermatitis which already have impaired glucose homeostasis. 相似文献
76.
77.
The effect of clenbuterol on the incidence of abomasal lesions in veal calves was studied in two fattening units. Some of the calves in each unit were treated with 1.6 micrograms clenbuterol/kg bodyweight/day from the seventh until the 23rd week of the fattening period. In one unit the calves were fed milk replacer only and 176 of the 236 calves were treated with clenbuterol. In the other unit the calves were fed roughage pellets in addition to milk replacer and 92 of the 194 calves were treated with clenbuterol. Only in the second unit did the calves treated with clenbuterol have significantly fewer abomasal lesions. 相似文献
78.
Summary Twenty four maiden heifers were bred by natural route by a specific immunotolerant bull, that was persistently infected with Bovine Viral Diarrhoea virus (BVD virus). The quality of the bull's semen was normal. Twelve heifers became pregnant in the first oestrus cycle and the remaining twelve in the second oestrus cycle. This leads to the conclusion that such persistently infected bulls may have good fertilisation results. Nevertheless, it is felt that bulls persistently infected with the BVD virus must be excluded from artificial insemination centres because of the risk of introducing BVD virus in a herd by the semen. 相似文献
79.
J. Kirpensteijn R.J. Maarschalkerweerd I. van der Gaag H.S. Kooistra F.J. van Sluijs 《The Veterinary quarterly》2013,33(2):67-70
Summary The macroscopic and histological appearance of jejunal antimesenteric incisions approximated with two different absorbable suture materials (monofilament versus multifilament) and three closure techniques (appositional single layer, crushing single layer, and double layer) were compared in healthy dogs at 14 or 28 days, postoperatively. No significant differences between the two suture materials were observed for most of the macroscopic or histological variables. However, the monofilament suture material caused significantly more fibrous tissue reaction in the muscular layer of the jejunum than did the multifilament suture material. Of the three enterotomy closure techniques used in this study, the appositional single‐layer method proved to be the best. The double‐layer closure method caused a significant decrease in the incisional circumference, the relative circumference, and volume of the jejunum, and a significant increase in jejunal wall thickness. Our findings suggest that canine jejunal enterotomy incisions can be closed using an appositional suture pattern with relatively rapidly absorbable monofilament suture material. The use of double‐layer suture patterns for closure of jejunal enterotomy incisions should be avoided because the size of the intestinal lumen may be reduced. 相似文献
80.
Nycticeius schlieffenii is a monestrous species that breeds during the spring months in the northern parts of the Kruger National Park. During spring 1983 the average number of corpora lutea in 11 Nycticeius schlieffenii females was 3,1 (range 1 -4), with the average number of fetuses recorded 2,8. In the present study this bat has been found to be a polyovular seasonal breeder, giving birth to as many as three young per estrous cycle. 相似文献