全文获取类型
收费全文 | 410篇 |
免费 | 22篇 |
专业分类
林业 | 20篇 |
农学 | 34篇 |
基础科学 | 1篇 |
62篇 | |
综合类 | 18篇 |
农作物 | 56篇 |
水产渔业 | 32篇 |
畜牧兽医 | 183篇 |
园艺 | 1篇 |
植物保护 | 25篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 13篇 |
2020年 | 10篇 |
2019年 | 14篇 |
2018年 | 15篇 |
2017年 | 11篇 |
2016年 | 12篇 |
2015年 | 19篇 |
2014年 | 18篇 |
2013年 | 17篇 |
2012年 | 26篇 |
2011年 | 29篇 |
2010年 | 26篇 |
2009年 | 22篇 |
2008年 | 28篇 |
2007年 | 16篇 |
2006年 | 22篇 |
2005年 | 16篇 |
2004年 | 21篇 |
2003年 | 22篇 |
2002年 | 17篇 |
2001年 | 25篇 |
2000年 | 8篇 |
1999年 | 12篇 |
1998年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有432条查询结果,搜索用时 46 毫秒
341.
Effects of dietary inclusion of yacon,ginger and blueberry on growth,body composition and challenge test of juvenile rockfish (Sebastes schlegeli) against Edwardsiella tarda
下载免费PDF全文
![点击此处可从《Aquaculture Nutrition》网站下载免费的PDF全文](/ch/ext_images/free.gif)
H.S. Kim K.W. Lee H.S. Jung J. Kim A. Yun S.H. Cho M. Kwon 《Aquaculture Nutrition》2018,24(3):1048-1055
Effects of dietary inclusion of yacon, Polymnia sonchifolia (YC), ginger, Zingiber officinale (GG), and blueberry, Vaccinium ashei (BB), on growth, body composition and challenge test of rockfish against Edwardsiella tarda compared to ethoxyquin were investigated. Three hundred and sixty fish were randomly distributed into 12 flow‐through tanks. Four experimental diets were prepared: the control diet (Con) with 0.1 g/kg ethoxyquin, and YC, GG and BB diets. Each diet was assigned to triplicate tanks of fish and hand‐fed for 8 weeks. Externally normal fish after fourth and eighth weeks of feeding trial were infected with Edwardsiella tarda for challenge test. Weight gain and specific growth rate (SGR) of fish fed the YC diet were greater than those of fish fed all other diets. Feed efficiency, protein efficiency ratio and protein retention of fish fed the YC diet were higher than those of fish fed all other diets. In the both fourth and eighth weeks of infection trials, mortality of fish fed the Con diet was higher than that of fish fed all other diets. In conclusion, dietary inclusion of YC, GG and BB increased weight gain and SGR of fish. YC, GG and BB for 4 and 8 weeks lowered mortality of fish at occurrence of E. tarda. 相似文献
342.
Effect of dietary taurine levels on the conjugated bile acid composition and growth of juvenile Korean rockfish Sebastes schlegeli (Hilgendorf)
下载免费PDF全文
![点击此处可从《Aquaculture Research》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Shin‐Kwon Kim Kyoung‐Gil Kim Kyoung‐Duck Kim Kang‐Woong Kim Maeng‐Hyun Son Michael Rust Ronald Johnson 《Aquaculture Research》2015,46(11):2768-2775
This study was conducted to investigate the effects of different taurine levels on the conjugated bile acid composition and growth of juvenile rockfish. Five taurine level diets were made by the supplementation of taurine (0%, 0.5%, 1.0%, 1.5% and 2.0%) to a basal diet. Fish meal washed with 70% ethanol to exclude taurine was used for the sole protein source. Feeding experiments were accomplished at 15°C using juvenile fish (initial BW: 13.5 g). Fish were fed the experimental diets for 4 months. At the end of experiments, fish were weighed and stored at ?80°C for analysis of free amino acids and conjugated bile acids contents. The growth performance and feed efficiency of Korean rockfish were improved by taurine supplementation in the experimental diets. The taurine contents of the whole body increased with the increase in the taurine supplementation. The primary conjugated bile acids in gall bladder were taurocholic acid (83.5–165.6 mg mL?1) and taurochenodeoxycholic acid (6.3–20.0 mg mL?1). Total bile acids increased with increases in dietary taurine. Taurocholic acid content was more than 95% of the total conjugated bile acids. This indicates that taurine is the sole amino acid to make conjugated bile acid in Korean rockfish. Dietary taurine levels improved the conjugated bile acid composition in juvenile Korean rockfish. 相似文献
343.
H.C. Kwon S.H. Choi Y.U. Kim S.O. Son J.Y. Kwon 《Fish physiology and biochemistry》2003,28(1-4):351-352
Immature eels positively responded to estradiol-17β (E2) injection in terms of vitellogenin (Vg) synthesis but not to growth hormone (GH) or 17α-methyltestosterone (MT) injection. However, injection of MT or GH combined with E2 strongly increased Vg synthesis. In in vitro experiments, eel hepatocytes treated with E2, GH, or MT alone did not produce detectable amount of Vg, whereas the combination of E2 with GH or MT, or both greatly increased Vg synthesis in the hepatocytes. 相似文献
344.
345.
346.
347.
To improve pig cloning efficiency, the present study evaluated the effect of ovulation status, seasonality and embryo transfer (ET) method on in vivo development of cloned porcine embryos. Cloned embryos were transferred to surrogate mothers on the same day of somatic cell nuclear transfer. In pre‐ovulation stage (PO), pregnancy rate (PR) and delivery rate (DR) were 36.3% and 9.4%, respectively. In post‐ovulation stage, 22.7% PR and 2.1% DR were recorded (both PR and DR are significantly higher in PO). When ET was performed during winter (December–February), spring (March–May), summer (June–August) and autumn (September–November), the PRs were 13.4%, 37.3%, 24.6% and 51.0%, while DRs were 0%, 12.7%, 4.3% and 7.8%, respectively. The highest PRs were recorded in autumn groups. However, DRs were significantly lower in autumn (7.8%) group compared with spring (12.7%) group. The PR was the lowest and no piglets were born in winter group, which might be because of the effect of low temperature during ET. To overcome the low PR in winter group, 0.25 ml straws were used for ET to minimize exposure time of embryos to ambient temperature. The straw ET group showed significantly higher PR in the winter group (23. 9%) compared with the conventional catheter‐loading group (7.7%). We suggest that using PO recipient and ET in spring is the best condition for pig cloning. In addition, alternative method to reduce cold shock during ET in winter is necessary. 相似文献
348.
349.
Identification of gamma ray and electron-beam irradiated wheat after different processing treatments
Photostimulated luminescence (PSL) and thermoluminescence (TL) methods were employed to monitor radiation-induced markers in gamma ray and electron-beam irradiated wheat after steaming (100 °C, 30 min) & puffing (1.176 MPa, 15 min) treatments. Steamed wheat samples, regardless of radiation source, gave photon counts (PCs) below 700 (negative) for non-irradiated samples whereas irradiated samples gave PCs in the range of 13,564–29,959 (positive) showing the effectiveness of PSL as a screening test. However, puffed irradiated wheat samples gave PCs in the range of 1100–2138 (intermediate) showing the more drastic effect of puffing treatment than steaming. In TL analysis, the most drastic effect on TL glow curve intensity was also found by puffing treatment, but for all other samples, identification was possible as a maximum peak for irradiated samples appeared in the range of 150–250 °C. TL ratio (TL1/TL2) was calculated after 1 kGy re-irradiation of TL1-tested minerals, to enhance the reliability of TL1 results. For the non-irradiated steamed samples, regardless of radiation source, TL ratio was less than 0.1 whereas ratios were more than 0.1 for all irradiated samples except puffed ones. The results proved the potential of luminescence techniques to characterize irradiated samples; however heat processing conditions showed an apparent effect on luminescence properties of irradiated samples. 相似文献
350.
Deok Ho Kwon Jeong Joon Ahn J. Marshall Clark 《Pesticide biochemistry and physiology》2010,96(1):36-42
Molecular mechanisms of monocrotophos resistance in the two-spotted spider mite (TSSM), Tetranychus urticae Koch, were investigated. A monocrotophos-resistant strain (AD) showed ca. 3568- and 47.6-fold resistance compared to a susceptible strain (UD) and a moderately resistant strain (PyriF), respectively. No significant differences in detoxification enzyme activities, except for the cytochrome P450 monooxygenase activity, were found among the three strains. The sensitivity of acetylcholinesterase (AChE) to monocrotophos, however, was 90.6- and 41.9-fold less in AD strain compared to the UD and PyriF strains, respectively, indicating that AChE insensitivity mechanism plays a major role in monocrotophos resistance. When AChE gene (Tuace) sequences were compared, three point mutations (G228S, A391T and F439W) were identified in Tuace from the AD strain that likely contribute to the AChE insensitivity as predicted by structure analysis. Frequencies of the three mutations in field populations were predicted by quantitative sequencing (QS). Correlation analysis between the mutation frequency and actual resistance levels (LC50) of nine field populations suggested that the G228S mutation plays a more crucial role in resistance (r2 = 0.712) compared to the F439W mutation (r2 = 0.419). When correlated together, however, the correlation coefficient was substantially enhanced (r2 = 0.865), indicating that both the F439W and G228S mutations may work synergistically. The A391T mutation was homogeneously present in all field populations examined, suggesting that it may confer a basal level of resistance. 相似文献