全文获取类型
收费全文 | 14496篇 |
免费 | 1085篇 |
国内免费 | 78篇 |
专业分类
林业 | 656篇 |
农学 | 847篇 |
基础科学 | 125篇 |
2077篇 | |
综合类 | 1704篇 |
农作物 | 511篇 |
水产渔业 | 1118篇 |
畜牧兽医 | 7195篇 |
园艺 | 233篇 |
植物保护 | 1193篇 |
出版年
2023年 | 90篇 |
2022年 | 72篇 |
2021年 | 97篇 |
2020年 | 127篇 |
2019年 | 209篇 |
2018年 | 378篇 |
2017年 | 355篇 |
2016年 | 341篇 |
2015年 | 313篇 |
2014年 | 340篇 |
2013年 | 617篇 |
2012年 | 495篇 |
2011年 | 585篇 |
2010年 | 475篇 |
2009年 | 431篇 |
2008年 | 580篇 |
2007年 | 600篇 |
2006年 | 501篇 |
2005年 | 547篇 |
2004年 | 431篇 |
2003年 | 474篇 |
2002年 | 381篇 |
2001年 | 775篇 |
2000年 | 740篇 |
1999年 | 604篇 |
1998年 | 176篇 |
1997年 | 169篇 |
1996年 | 129篇 |
1995年 | 153篇 |
1994年 | 160篇 |
1993年 | 120篇 |
1992年 | 323篇 |
1991年 | 351篇 |
1990年 | 295篇 |
1989年 | 268篇 |
1988年 | 275篇 |
1987年 | 319篇 |
1986年 | 246篇 |
1985年 | 193篇 |
1984年 | 170篇 |
1983年 | 151篇 |
1982年 | 94篇 |
1981年 | 85篇 |
1980年 | 80篇 |
1979年 | 142篇 |
1978年 | 96篇 |
1977年 | 75篇 |
1975年 | 77篇 |
1974年 | 79篇 |
1973年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
21.
T Tsuboi Y Kanazawa T Syoji S Tokuhisa 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(6):1179-1181
Bovine follicular oocytes collected from bovine ovaries were exposed to bovid herpesvirus 1 (BHV-1). After washings, these oocytes were cultured to mature. As a result BHV-1 could not be removed from the oocytes and could replicate in the oocytes with cumulus cells, but not in the oocytes without the cells. Moreover, the specific fluorescence for BHV-1 was detected in the cumulus cells by a indirect immunofluorescent technique. Therefore these findings suggested BHV-1 could be absorbed in the oocytes but the replication of BHV-1 was done in the cumulus cells. 相似文献
22.
K Adachi A Yoshimoto T Hasegawa T Shimizu Y Goto S Makimura 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(6):1081-1084
Due to the potential for anti-erythrocyte membrane antibodies as possible enhancers of erythrocyte destruction, the presence of serum anti-erythrocyte membrane antibodies in 31 dogs with Babesia gibsoni infection admitted to a veterinary hospital was investigated by an enzyme linked immunosorbent assay (ELISA) and immunoblotting analyses. This infection resulted in an increase of anti-erythrocyte membrane antibodies in 84% (IgG) and 74% (IgM) of 31 infected dogs, respectively. This was confirmed by the similarity in the protein profiles of the erythrocyte membrane antigens immunoblotted with rabbit antiserum to dog erythrocyte membrane antigens and infected dog serum. These results suggest the production of anti-erythrocyte membrane antibodies was induced by B. gibsoni infection. 相似文献
23.
Characterisation of cross-reactivity of virus neutralising antibodies induced by feline panleukopenia virus and canine parvoviruses 总被引:1,自引:0,他引:1
K. Nakamura Y. Ikeda T. Miyazawa Y. Tohya E. Takahashi M. Mochizuki 《Research in veterinary science》2001,71(3):219-222
It was recently reported that canine parvoviruses (CPV) had entered cat populations and induced disease in infected cats, while they had affected only dogs in the past. It is important to determine whether conventional feline panleukopenia virus (FPLV) vaccines protect against recent CPV infections. In this study, the cross-reactivity of virus-neutralising (VN) and haemagglutinin-inhibition (HI) antibodies in cats induced by FPLV and CPV s were examined. Lower cross-reactivities of VN and HI antibodies against each CPV strain were observed in cats experimentally inoculated with FPLV or vaccinated with an inactivated FPLV vaccine. In addition, we revealed the existence of a novel type of FPLV, which reacted weakly with antibodies induced by the conventional FPLV vaccine. 相似文献
24.
K Uchio-Yamada N Manabe M Yamaguchi N Akashi Y Goto Y Yamamoto A Ogura H Miyamoto 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2001,63(11):1171-1178
Fibrotic degeneration was examined in the kidneys of ICR-derived glomerulonephritis (ICGN) mice, a novel inbred mouse line with a hereditary nephrotic syndrome of unknown etiology considered to be a good model of human idiopathic nephrotic syndrome. In the present study, we histochemically revealed changes in accumulation of extracellular matrix (ECM) components and in localization of integrins, cellular receptors for ECM, in the kidneys of ICGN mice with the progression of renal failure. Excessive accumulation of basement membrane (laminin and collagen IV) and interstitial (type III collagen) ECM components were demonstrated in the glomeruli and tubulointerstitum of ICGN mice. Marked deposition of type I collagen and tenascin was seen only in the glomeruli of ICGN mice but not in those of ICR mice as normal controls. Increased expression of integrin alpha1-, alpha2-, alpha5- and beta1-subunits in glomeruli with fibrotic degeneration and abnormal distribution of alpha6-subunit were noted in the kidneys of ICGN mice. Excessive laminin, a ligand of alpha6beta1-integrin, was demonstrated on the tubular basement membrane, but alpha6-subunit diffusely disappeared on the basal side of the tubular epithelial cells. We presumed that abnormal integrin expression in renal tubules causes epithelial cell detachment, and consequently tubular nephropathy, and results in disorder of ECM metabolism causing excessive accumulation of ECM components in the kidneys of ICGN mice. 相似文献
25.
Y. SANTOS I. BANDIN S. NUÑEZ K. GRAVNINGEN A. E. TORANZO 《Journal of fish diseases》1991,14(3):407-411
Abstact. The potency of a whole-cell bacterin (WCB) and a toxoid enriched whole-cell vaccine (WCEB) administered intraperitoncally into rainbow trout, Oncorhynchus mykiss (Richardson), were compared. The most effective vaccine was further evaluated by bathing turbot, Scophthalmus maximus (L.). These vaccines were composed of three strains of V. anguillarun , of the serotypes 01 and 02. Both vaccines conferred the highest protection against strains of serotype 01 within 4 weeks. With the toxoid enriched vaccine giving the best results (77 RPS). When trout were revaccinated after 7 weeks with this vaccine, good protection was achieved against strains of serotypes 01 and 02. Interestingly, when the WCEB was administered by bath to turbot, acceptable levels of protection against strains of both serotypes were obtained after 4 weeks of immunization. 相似文献
26.
27.
The hemolytic effect of onion consumption in dogs with hereditary high erythrocyte reduced glutathione and potassium concentrations (designated HK dogs) was compared with that in clinically normal dogs. Twelve hours after oral administration of boiled onions (200 g/dog), hemoglobin concentration decreased to 84.4% of the initial value in HK dogs; it decreased only to 90.5% in clinically normal dogs. At 24 hours, methemoglobin concentration was significantly (P less than 0.05) higher in HK dogs than in clinically normal dogs. The concentration of erythrocyte oxidized glutathione increased about fivefold at 10 hours in HK dogs, whereas it did not change during the experimental period in clinically normal dogs. In addition, at 12 hours, the proportion of erythrocytes containing Heinz bodies increased to 24.4% in HK dogs, but increased only to 1.2% in clinically normal dogs. Thus, results indicated that HK dogs were more susceptible to the oxidant action of onions than were clinically normal dogs. 相似文献
28.
29.
K Okada A Yamaguchi K Ohshima S Numakunai H Itoh Y Seimiya H Koyama 《Veterinary pathology》1989,26(2):136-143
Biopsies of skin from a 2-year-old heifer with spontaneously regressing dermal leukosis were examined. The heifer was not infected with bovine leukemia virus and was negative for tumor-associated antigens of enzootic bovine lymphosarcoma. By hematological standards for bovine leukemia, the heifer was positive at about 60 days post-occurrence of the disease (POD). At 53 days POD, lymphoblastic neoplastic cells in the dermis reacted with anti-T lymphocyte monoclonal antibody by the avidin biotin peroxidase complex method. The cells had intracytoplasmic clustered dense bodies under electron microscopy. From 53 to 83 days POD, figures of the transepithelial elimination (TE) against neoplastic cells and perivascular infiltration of small lymphocytes were in the dermis. Small lymphocytes reacted with anti-T lymphocyte monoclonal antibody. At necropsy there were no neoplastic lesions; there were flat lymph node-like tissues in the subcutis. Many germinal centers were seen in the lymphatic organs. Blood lymphocytes at 46 days POD were stimulated by phytohemagglutinin-P and concanavalin A. Sera, taken until 75 days POD and at necropsy, showed an inhibitory effect on mitogen-induced blastogenesis of normal bovine lymphocytes. These results suggested the existence of a spontaneous regressive mechanism against neoplastic lesions by TE and tumor immunity. 相似文献
30.
Y Zhou V Moennig C O Coulibaly J Dahle B Liess 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(1):76-80
Monoclonal antibodies against hog cholera and bovine viral diarrhoea viruses were assayed on organ tissue sections of experimentally infected animals. The animals had been infected simultaneously with both viruses. The antibodies were tested using an indirect immunofluorescence test and an indirect enzyme immunoassay with a biotin/streptavidin/peroxidase detection system. A polyclonal hyperimmune serum was used as a control in direct immunofluorescence tests. Both techniques based on monoclonal antibodies were more sensitive and more specific than the conventional test, the enzyme immunoassay being more sensitive than the immunofluorescence test. Small amounts of BVD viral antigen were demonstrable with monoclonal antibodies in most organ tissues. 相似文献