全文获取类型
收费全文 | 865篇 |
免费 | 40篇 |
专业分类
林业 | 94篇 |
农学 | 12篇 |
基础科学 | 1篇 |
87篇 | |
综合类 | 113篇 |
农作物 | 14篇 |
水产渔业 | 66篇 |
畜牧兽医 | 486篇 |
园艺 | 17篇 |
植物保护 | 15篇 |
出版年
2021年 | 15篇 |
2020年 | 10篇 |
2019年 | 20篇 |
2018年 | 16篇 |
2017年 | 14篇 |
2016年 | 8篇 |
2015年 | 16篇 |
2014年 | 19篇 |
2013年 | 37篇 |
2012年 | 45篇 |
2011年 | 52篇 |
2010年 | 20篇 |
2009年 | 19篇 |
2008年 | 39篇 |
2007年 | 27篇 |
2006年 | 36篇 |
2005年 | 38篇 |
2004年 | 29篇 |
2003年 | 38篇 |
2002年 | 33篇 |
2001年 | 27篇 |
2000年 | 20篇 |
1999年 | 20篇 |
1998年 | 14篇 |
1997年 | 8篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1993年 | 6篇 |
1992年 | 10篇 |
1991年 | 18篇 |
1990年 | 12篇 |
1989年 | 10篇 |
1988年 | 17篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 14篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1979年 | 7篇 |
1973年 | 8篇 |
1972年 | 9篇 |
1970年 | 6篇 |
1969年 | 5篇 |
1968年 | 7篇 |
1966年 | 6篇 |
1913年 | 6篇 |
1910年 | 6篇 |
1909年 | 6篇 |
排序方式: 共有905条查询结果,搜索用时 31 毫秒
21.
Wagner WM Kirberger RM Groenewald HB 《Journal of the South African Veterinary Association》2001,72(4):203-208
This study provides a reference for the radiographic anatomy of the thoraco-abdominal cavity of female ostriches as a representative of ratites. One ostrich cadaver, 2 adult and 2 growing ostriches were used. Right lateral radiographs produced by a 6-frame technique and 2 dorsoventral radiographs produced by an adapted 3-frame technique were selected and schematic illustrations of these were labelled to illustrate normal radiographic anatomy. Differences from other avian species and unique features of the ostrich are briefly discussed. 相似文献
22.
Ultrasonographic examinations were performed on 17 clinically healthy adult common marmosets to gain information about the normal abdominal echoanatomy. The marmosets were 1.5-9 years of age and weighed between 328 and 506g. Marked species-specific differences compared with the cat or dog were noted. Good images of the kidneys, bladder, spleen, adrenal glands, liver, and the gastrointestinal tract could be obtained. The pancreas, caecum, and abdominal lymph nodes were not seen. The spleen was the least echogenic organ, followed by the medium echogenic liver and the sometimes isoechoic, but mostly hyperechoic renal cortex. The kidneys had a poor corticomedullary distinction. The prominent right lobes of the liver extended caudally far beyond the costal arch. The gallbladder had a bi- to multi-lobed appearance with a wide, tortuous cystic duct. The pylorus was centrally positioned. The adrenal glands were readily seen, but should not be confused with the adjacent spleen. A statistically significant (P<0.05) difference between female and male kidney, and right adrenal gland length was present. 相似文献
23.
Jonathan H. Foreman D.V.M. Stephen M. Reed D.V.M. Norman W. Rantanen D.V.M. M.S. Richard M. DeBowes D.V.M. M.S. Pamela C. Wagner D.V.M. M.S. 《Journal of Equine Veterinary Science》1983,3(5):154-164
Since the normal absorption of CSF occurs in the cerebral veins and venous sinuses, any obstruction to the normal flow and absorption of CSF will result in accumulation of CSF central to the site of obstruction. Such accumulation within the cranium is defined as hydrocephalus.A foal was presented with an enlarged and an abnormally-shaped skull, but with normal behavior. The filly's condition deteriorated. Radiographs showed a domeshaped cranial vault with compression of the frontal sinus region. Massive hydrocephalus with little normal cerebral tissue left was diagnosed with ultrasound.Surgery was attempted to relieve the pressure. Eventually the foal was euthanized. Post-mortem confirmed the radiographic and ultrasound diagnosis. Since there was a lack of demonstrable obstruction, the authors suspected the foal had suffered from the Arnold-Chiari syndrome. 相似文献
24.
Mice in a hybrid breeding colony developed symptoms compatible with a diagnosis of salmonellosis. Salmonella oranienburg was recovered from feces by conventional bacteriological techniques. Active salmonellosis appeared to be precipitated by the stress of pregnancy among breeder female BALB/c mice. Necropsy examination of the BALB/c breeder females revealed diarrhea, roughened hair coats, enlarged spleens, white foci in the liver, and skin abscesses. S. oranienburg was recovered from the spleen, cecum, oropharynx, uterus, and skin abscesses of affected mice. DBA/2N breeder males were asymptomatic and S. oranienburg was recovered from the cecum only. Breeding productivity indices dropped to unacceptable levels in rooms containing infected animals. Relatively normal production was observed among uninfected animals of the same strains in adjacent rooms, thus demonstrating the detrimental effect S. oranienburg had on this breeder colony. 相似文献
25.
26.
27.
Distribution of immunoglobulin-bearing cells in the gut-associated lymphoid tissues of the turkey: effect of antibiotics 总被引:2,自引:0,他引:2
Distribution of immunoglobulin (Ig)-bearing cells in the gut-associated lymphoid tissues of antibiotic treated and untreated control turkeys (Meleagris gallopavo) was compared. Antibiotic treatment was similar to a regimen used in commercial turkey production, which included preincubation dipping of fertile eggs in gentamicin solution, injection of turkeys with gentamicin at hatching, and inclusion of chlortetracycline in the diet. Tissues were examined from turkeys at 3, 7, 14, and 21 days of age with a direct immunofluorescence procedure. Cell distribution in control turkeys was as follows: In the bursa of Fabricius, IgA-carrying cells predominated at 3 days of age, but at later intervals, the 3 classes of Ig-bearing cells were in equal numbers. In the cecal tonsils, IgM- and IgA-bearing cells were in larger numbers at 3 days of age, whereas, the IgG-bearing cells were sparsely distributed. By 7 days of age, IgM cells became more numerous in the cecal tonsils and remained numerous until 21 days of age. At 3 days of age, IgA cells predominated in the small intestines and IgM cells predominated in the large intestine. At 7 and 14 days of age, IgM cells were more numerous in the small and large intestines, but by 21 days of age, IgA cell population equaled that of IgM. The IgG cells were generally sparse in the intestines. Antibiotic treatment often resulted in lower numbers of Ig-positive cells, especially those bearing IgM and IgA. Normal development of the bursa of Fabricius was also retarded in this group. 相似文献
28.
29.
Gallatin LL Irizarry-Rovira AR Renninger ML Holman PJ Wagner GG Sojka JE Christian JA 《Journal of the American Veterinary Medical Association》2003,223(7):1027-32, 986
Two male North American elk from a commercial herd were evaluated because of a sudden onset of lethargy, anorexia, and voiding of red urine. These 2 elk were kept in the same pen as 4 other male elk that had died during the preceding 2 months. Laboratory analyses revealed anemia and intraerythrocytic parasites, later confirmed as Babesia odocoilei (a protozoal hemoparasite of cervids). Of the 240 elk remaining in the herd, 59 were screened for B odocoilei by microscopic evaluation of blood smears, protozoal culture of blood, and immunofluorescent antibody testing of serum. Of those 59 elk, 34 (58%) were infected with B odocoilei. Babesia odocoilei infection in elk can be fatal and should be considered in cases of sudden death or acute hemolytic anemia. Familiarity with the disease in elk is essential for practitioners because of the increasing popularity of commercial elk farming. 相似文献
30.