全文获取类型
收费全文 | 447篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
林业 | 49篇 |
农学 | 6篇 |
基础科学 | 1篇 |
44篇 | |
综合类 | 7篇 |
农作物 | 9篇 |
水产渔业 | 71篇 |
畜牧兽医 | 242篇 |
园艺 | 1篇 |
植物保护 | 26篇 |
出版年
2022年 | 6篇 |
2021年 | 33篇 |
2020年 | 10篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 27篇 |
2014年 | 21篇 |
2013年 | 28篇 |
2012年 | 25篇 |
2011年 | 31篇 |
2010年 | 12篇 |
2009年 | 11篇 |
2008年 | 39篇 |
2007年 | 36篇 |
2006年 | 21篇 |
2005年 | 30篇 |
2004年 | 25篇 |
2003年 | 22篇 |
2002年 | 21篇 |
2001年 | 13篇 |
2000年 | 6篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1989年 | 1篇 |
1979年 | 1篇 |
1953年 | 1篇 |
排序方式: 共有456条查询结果,搜索用时 31 毫秒
91.
Hirofumi Furuita Tatsuya Unuma Kazuharu Nomura Hideki Tanaka Tsuyoshi Sugita & Takeshi Yamamoto 《Aquaculture Research》2009,40(11):1270-1278
This paper describes the relationship between the egg vitamin concentrations and the egg quality in the Japanese eel Anguilla japonica . No notable relation was found between any vitamin and the fertilization rate. Hatching and survival rates of larvae, however, significantly increased with an elevated level of egg vitamin C (VC). In contrast to VC, the relation between vitamins E (VE) and A (VA) concentrations and survival rate showed a clear peak, with a reduced survival rate at both higher and lower vitamin concentrations. The ratio of VE to lipid or highly unsaturated fatty acid (HUFA) in eggs positively correlated with hatching and survival rates of larvae. High-quality (HQ) eggs were determined as eggs that produced larvae having a survival rate higher than 80% at 8 days post hatch, and low-quality (LQ) eggs were determined as eggs that did not hatch. The level of VC of HQ was significantly higher than LQ. The results of this study suggest that HQ eggs, which produce larvae having a high survival rate, must have high levels of VC and VE/HUFA ratio and contain optimum levels of VA and VE in Japanese eel. 相似文献
92.
Vongvichith Bounsong Morioka Shinsuke Sugita Tsuyoshi Phousavanh Nokjalia Phetsanghanh Norkeo Chanthasone Phonaphet Pommachan Phoutsamone Nakamura Satoshi 《Fisheries Science》2020,86(1):145-151
Fisheries Science - The growth of the climbing perch Anabas testudineus reared on lower protein feeds with the replacement of fishmeal (FM) by prepupae of the black soldier fly (BSF) Hermetia... 相似文献
93.
Yasuro Iwashita Nobuhiro Suzuki Hiroyuki Matsunari Tsuyoshi Sugita Takeshi Yamamoto 《Fisheries Science》2009,75(5):1307-1315
To investigate the cause of the changes in intestinal morphology and biliary bile status of rainbow trout Oncorhynchus mykiss fed defatted soybean meal (SBM)-based diets, casein-based semipurified diets supplemented with soya saponin, soya lectin,
and cholyltaurine were fed to rainbow trout for 6 weeks. An unsupplemented control diet and a SBM-based diet were also tested
as references. Poor development of microvilli and pinocytotic vacuoles, and accumulation of large vacuoles in the epithelial
cells were observed in the distal intestine of fish fed diets containing saponin but not cholyltaurine. Hyperplastic connective
tissue in the mucosal folds of the distal intestine was observed in fish fed a diet containing both saponin and lectin but
not cholyltaurine. However, intestinal histological features in fish fed diet supplemented with cholyltaurine and lectin and/or
saponin were similar to those in the control diet group. Liver morphology and biliary bile status were not affected by saponin
and lectin. These results suggest that the abnormal features of the distal intestine of rainbow trout fed SBM-based diets
are caused by the combination of soya saponin and soya lectin, and that supplemental cholyltaurine plays certain roles in
normalizing the intestinal abnormalities caused by the saponin and lectin. 相似文献
94.
Tsuyoshi OZAWA Takashi IJICHI Mitsuya SHIRAISHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(11):1786
Microparticles (MPs) are released from budding plasma membranes into body fluids. The use of flow cytometry for the measurement of MP in canines has not been standardized. In this fundamental study, we compared the effect of anticoagulant agents, such as acid-citrate-dextrose (ACD) and heparin on the measurement of canine MPs in platelet-free plasma (PFP) using flow cytometry. In addition, we used annexin V, carboxyfluorescein succinimidyl ester (CFSE), or calcein tetraacetoxymethyl ester (calcein-AM), and explored the characteristics of the staining reagents in MP detection using flow cytometry. We were able to measure canine MPs in PFP prepared from ACD-anticoagulated blood using flow cytometry, in which the highest positive rate for fluorescent staining was observed when CFSE was used. 相似文献
95.
Fuminori Kobayashi Hisayo Kojima Tsuyoshi Tanaka Mika Saito Chikako Kiribuchi-Otobe Toshiki Nakamura 《Plant Breeding》2020,139(1):93-106
Yellow mosaic disease, caused by wheat yellow mosaic virus (WYMV), is one of the most serious diseases of winter wheat in Japan and China. A single major QTL for WYMV resistance in the Japanese wheat variety 'Yumechikara', designated Q.Ymym, has been mapped on a 43.6 cM linkage block between the two markers Xcfd233 and Xgwm349 on chromosome 2D. We were able to obtain two recombinants within the block, which facilitated reducing the size of the linkage block. The pseudomolecule sequence of 'Chinese Spring' (CS) indicated that the original Q.Ymym region of 43.6 cM corresponded to 68.5 Mb and the narrowed Q.Ymym region represents a size of 27.3 Mb. The sequence features of the Q.Ymym region were unique in comparison with CS sequences, which may have led to the low recombination rate within the block. The Q.Ymym haplotype block was detected in other WYMV-resistant varieties but not in the susceptible varieties used in this study. The unique sequence structure of the Q.Ymym region allowed the development of co-dominant markers for use in marker-assisted selection. 相似文献
96.
97.
98.
Kaoru YAMAZAKI Takehito SUZUKI Mitsuyuki SHIRAI Tatsuya TAKIZAWA Tadashi SHINODA Toshio MASAOKA Fumiaki AKAHORI Hidetoshi MORITA 《Animal Science Journal》2008,79(3):391-400
The effect of the endocrine-disrupting chemical 3,3',4,4',5-pentachlorobiphyenl (PCB 126) on intestinal microbiota after oral administration, and the improvement of intestinal microbiota and feces quantity by the subsequent administration of Lactobacillus acidophilus or Lactobacillus reuteri was investigated. All the rats were given 100 μg/kg bodyweight of PCB 126. The changes in bacterial counts were confirmed using a culture method. The administration of PCB 126 tended to decrease the bacterial counts of lactobacilli (109.6 −1010.2 to 108.8 −109.2 ) and bifidobacteria (105.3 −106.1 to 103.6 −104.2 ), and to increase those of Enterobacteriaceae (108.2 −109.1 to 109.4 −1010.3 ) and staphylococci (106.6 −107.4 to 107.2 −108.4 ) compared to no PCB 126 administration. After administration of PCB 126, L. acidophilus or L. reuteri orally administered to rats caused Enterobacteriaceae and staphylococci counts to decrease, suggesting that the intestinal microbiota was improved by the lactobacilli. The administration of L. acidophilus and L. reuteri improved the balance of intestinal microbiota, and defecation volume returned to its normal level. L. acidophilus and L. reuteri have a remedial effect on intestinal microbiota affected by PCB 126 and can function to lessen accumulated PCB 126 volume. 相似文献
99.
Data on 380 Duroc boars from seven generations, and 1026 Landrace pigs (341 boars and 685 gilts) from six generations were used to estimate genetic parameters for daily gain (DG), backfat thickness (BF), metabolic weight (MWT), daily feed intake (FI), feed conversion ratio (FCR) and residual feed intake (RFI). Two measures of RFI were estimated as the difference between actual feed intake and that predicted from models that included initial test age and weight and DG (RFI1); and initial test age and weight, DG and BF (RFI2). Heritability estimates for DG, MWT and FI were moderate for both breeds. BF estimates were high for both the breeds. The measures of feed efficiency (FCR and RFI) were moderately heritable. Genetic correlations of BF with measures of RFI were stronger when BF was not included in the estimation of RFI (0.40 and 0.46 for Duroc and Landrace, respectively (for RFI1), compared with 0.05 and 0.06 for Duroc and Landrace, respectively (for RFI2)). Genetic correlations of MWT with measures of RFI were all negative and low. Genetic and phenotypic correlations between DG and measures of RFI were close to zero, which indicated that selection for reduced RFI could be made without adversely affecting DG. BF should also decrease, and MWT should increase under selection for reduced RFI. The reduction in BF would depend on the measure of RFI used. 相似文献
100.
Tsuyoshi Ito Yoshitaka Katoh Yuko Shimada Aya Ohnuma-Koyama Naofumi Takahashi Maki Kuwahara Takanori Harada 《Journal of toxicologic pathology》2016,29(1):39-43
Extraskeletal osteosarcoma is extremely rare in mice. This case report demonstrates a spontaneous murine extraskeletal osteosarcoma that exhibited various histological growth patterns in an ICR mouse. At necropsy, the tumor mass was located in the abdominal wall and was 45 × 30 × 25 mm in size. Histopathologically, the tumor showed the following four growth patterns: a solid pattern of polygonal cells embedded in an osteoid eosinophilic matrix with calcification, an irregular sheet pattern of short spindle cells accompanying some eosinophilic multinucleated cells, a fascicular pattern of spindle cells and a cystic pattern lined by short spindle cells. Immunohistochemically, most of the tumor cells were positive for vimentin, proliferating cell nuclear antigen and osterix. The multinucleated cells mentioned above were desmin positive and were regarded as regenerative striated muscles but not tumor cells. Since no clear continuity with normal bone tissues was observed, the tumor was diagnosed as an “extraskeletal osteosarcoma.” 相似文献