全文获取类型
收费全文 | 236篇 |
免费 | 1篇 |
专业分类
林业 | 16篇 |
农学 | 5篇 |
20篇 | |
综合类 | 3篇 |
农作物 | 3篇 |
水产渔业 | 18篇 |
畜牧兽医 | 135篇 |
植物保护 | 37篇 |
出版年
2021年 | 10篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2016年 | 2篇 |
2015年 | 18篇 |
2014年 | 19篇 |
2013年 | 15篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 4篇 |
2009年 | 10篇 |
2008年 | 13篇 |
2007年 | 11篇 |
2006年 | 21篇 |
2005年 | 25篇 |
2004年 | 17篇 |
2003年 | 18篇 |
2002年 | 15篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1990年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有237条查询结果,搜索用时 15 毫秒
41.
Ganesh B Banyai K Masachessi G Mladenova Z Nagashima S Ghosh S Nataraju SM Pativada M Kumar R Kobayashi N 《Veterinary research》2011,42(1):52
ABSTRACT: Picobirnaviruses (PBV) are small, non-enveloped viruses with a bisegmented double-stranded RNA genome. In this study a PBV strain, PBV/Horse/India/BG-Eq-3/2010, was identified in the faeces of a 10 month old weaned female foal with diarrhoea in January 2010 from Kolkata, India. Surprisingly, sequence comparison and phylogenetic analysis of a short stretch of the RNA dependent RNA polymerase gene revealed close genetic relatedness (> 98% nucleotide identity) to a human genogroup I PBV strain (Hu/GPBV1) detected earlier from the same part of India. Our observations together with earlier findings on genetic relatedness between human and animal PBV warrant further studies on zoonotic potential. 相似文献
42.
Akiyoshi H Sugii S Nahid MA Sone K Tanaka T Zheng C Yijyun L Aoki M Takenaka S Shimada T Shimizu J Kiyomiya K Ohashi F 《Veterinary immunology and immunopathology》2011,144(3-4):255-258
The reactivity of different lectins with crude chromogranin A (CgA) obtained from different animals, namely, cow, horse, dog, pig, and dolphin, was examined to identify lectin(s) that would be useful as coating reagent(s) in a sandwich enzyme-linked immunosorbent assay (ELISA). Of the different lectins studied, the Amaranthus caudatus lectin (ACA), which is specific for the Thomsen-Friedenreich (T)-antigen (Galβ1-3GalNAc), was found to react with the CgA from different animals by western blotting. Purified rabbit anti-bovine CgA antibody was also found to cross-react with the crude CgA preparations. On the basis of these findings, a sandwich ELISA was developed with ACA as the coating reagent and anti-bovine CgA antibody as the probing antibody. Using this method, concentration-dependent curves ranging from 0.003 μg/mL to 25 μg/mL and from 0.02 μg/mL to 25 μg/mL were obtained for bovine CgA and canine CgA, respectively. Similarly, concentration-dependent curves were obtained for the equine, swine, and dolphin crude CgA extracts. Thus, ACA is concluded to be a valuable reagent for CgA detection in crude extracts from different animal species, and for CgA isolation/purification. 相似文献
43.
Mio KOBAYASHI Toshinori YOSHIDA Risako YAMASHITA Ryo ICHIKAWA Junta NAKAHARA Kazuki NAKAMURA Hiromu OKANO Yasunori TAKAHASHI Nanao ITO Makoto SHIBUTANI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(6):994
We encountered a case of cutaneous squamous cell carcinoma (SCC) in a 17-year-old female koala at a zoo. A fragile, papillary, elevated mass was found on the third digit of the right hind limb. SCC was identified histopathologically: squamous cell-like polygonal tumor cells showed a nest-like growth pattern with epidermal down growth, central keratinization and necrotic foci, and invaded dermal connective tissues. Metastatic lesions were observed in various organs, including the lung and axillary lymph node: in the lung, multiple metastatic foci similar to the primary lesion, and in the axillary lymph node, individual polygonal tumor cells infiltrated the sinusoids. Immunohistochemistry revealed that the tumor cells were positive for proliferating cell nuclear antigen, which exhibited 32–33% of labeling indices in the tumor cells. To our knowledge, this is the first report of a case of SCC in a digit of a koala. 相似文献
44.
Detection of Thiophanate-methyl-resistant Strains in Diplocarpon mail, Causal Fungus of Apple Blotch
Shuhei TANAKA Nobue KAMEGAWA Shin-ichi ITO Mitsuro KAMEYA-IWAKI 《Journal of General Plant Pathology》2000,66(1):82-85
Isolates of Diplocarpon mali, causal fungus of apple blotch, collected from four prefectures in Japan in 1997–1998 were tested for sensitivity to thiophanate-methyl.
Results from mycelial growth tests showed that MIC values of the fungicide were 0.19 μg/ml against all isolates from Akita,
Nagano and Saga prefectures but 100 or 200 μg/ml against all isolates from the Tokusa area in Yamaguchi prefecture. Detached
apple leaves sprayed with the fungicide developed severe symptoms when inoculated with the isolate from Tokusa, but developed
no symptoms with the isolate from Nagano. These results are the first confirmation of thiophanate-methyl-resistant strains
in D. mali.
Received 1 September 1999/ Accepted in revised form 15 October 1999 相似文献
45.
46.
Alternating dominance of postlarval sardine and anchovy caught by coastal fishery in relation to the Kuroshio meander in the Enshu-nada Sea 总被引:2,自引:1,他引:1
In the mid 1970s, the fishery catch of postlarval Japanese anchovy (Engraulis japonica) in a shelf region of the Enshu‐nada Sea, off the central Pacific coast of Japan, started to decline corresponding to a rapid increase of postlarval sardine (Sardinops melanostictus). In late 1980s, sardine started to decline, and it was replaced by anchovy in the 1990s. This alternating dominance of postlarval sardine and anchovy corresponded to the alternation in egg abundance of these two species in the spawning habitat of this sea. It was also noteworthy that during the period of sardine decline, sardine spawning occurred in April–May, a delay of two months compared with spawning in the late 1970s. The implication of oceanographic changes in the spawning habitat for the alternating dominance of sardine and anchovy eggs was explored using time‐series data obtained in 1975–1998, focusing on the effect of the Kuroshio meander. Large meanders of the Kuroshio may have enhanced the onshore intrusion of the warm water into the shelf region and contributed to an increase in temperature in the spawning habitat. This might favour sardine, because its egg abundance in the shelf region was more dependent on the temperature in early spring than was that of anchovy. In addition, enhanced onshore intrusion could contribute to transport of sardine larvae from upstream spawning grounds of the Kuroshio region. On the other hand, anchovy egg abundance was more closely related to lower transparency at the shelf edge, which may indicate the prevalence and prolonged residence of the coastal water, and therefore higher food availability, frequently accompanying non‐meandering Kuroshio. The expansion/shrinkage of the spawning habitat of sardine and anchovy in the shelf region, apparently responding to the change in the Kuroshio, possibly makes the alternation in dominance of postlarval sardine and anchovy most prominent in the Enshu‐nada Sea, in combination with changes in the abundance of spawning adults, which occurred almost simultaneously in the overall Kuroshio region. The implication of this rather regional feature for the alternating dominance of sardine and anchovy populations on a larger spatial scale is also discussed. 相似文献
47.
YUGO SHIMIZU KAZUTAKA TAKAHASHI SHIN-ICHI ITO SHIGEHO KAKEHI HIROAKI TATEBE ICHIRO YASUDA AKIRA KUSAKA TOMOHARU NAKAYAMA 《Fisheries Oceanography》2009,18(5):312-327
The lateral transport of organic carbon in large grazing copepods ( Neocalanus cristatus, Neocalanus flemingeri, Neocalanus plumchrus and Eucalanus bungii ) from the Oyashio area to the mixed water region (MWR) by the coastal Oyashio intrusion was estimated using the data of VMPS (vertical multiple plankton sampler) and 1500 dbar-referred geostrophic transport from the CTD (conductivity temperature depth sensor) data of five cruises during June 2001 to April 2002 on a repeat observation section OICE (Oyashio Intensive observation line off Cape Erimo), which extends southeastward from Hokkaido Island, Japan. The transport to MWR by the coastal Oyashio intrusion was estimated to be 5.3 × 1011 g C for the four species. Data from profiling floats also indicated that the copepods were advected from OICE to MWR by the coastal Oyashio intrusion within about 2 months. This transport is considered to be one of the significant sources of organic carbon in MWR as it is larger than the amount of large zooplankton consumed by Pacific saury ( Cololabis saira ) in MWR, one of the dominant copepod predators in this region. 相似文献
48.
49.
中国南部天然常绿阔叶林的地上生物量、净初级生产力、养分分布和养分利用效率 总被引:1,自引:0,他引:1
在中国南部的江西九连山自然保护区,观测研究了天然常绿阔叶林的地上生物量、地上NPP(净初级生产力)、养分的积累和分布,以及不同生活型树种的养分利用效率.在两个样地,用相对生长回归法和收获法测定了地上生物量,数值各约为340和270t/hm2,其中叶生物量约为9.6t/hm2.地上NPP约为年9.9t/hm2,其中叶生产力占44%.各种一般养分(N,P,K,Ca,Mg,Na)在森林生态系统中积累的特点是,Na和N在矿质土壤中有高的相对分布,K和Mg属中间地位,Ca和P则高分布于地上生物量中.氮的养分利用效率(NUE)、平均停留时间(MRT)和年生产力(A)表明,针叶树是氮的最高效的利用者,常绿阔叶树次之,落叶树在氮的利用上是最低效的. 相似文献
50.