全文获取类型
收费全文 | 2794篇 |
免费 | 142篇 |
国内免费 | 4篇 |
专业分类
林业 | 89篇 |
农学 | 76篇 |
基础科学 | 4篇 |
563篇 | |
综合类 | 357篇 |
农作物 | 373篇 |
水产渔业 | 204篇 |
畜牧兽医 | 1083篇 |
园艺 | 39篇 |
植物保护 | 152篇 |
出版年
2022年 | 41篇 |
2021年 | 65篇 |
2020年 | 37篇 |
2019年 | 51篇 |
2018年 | 67篇 |
2017年 | 58篇 |
2016年 | 71篇 |
2015年 | 71篇 |
2014年 | 84篇 |
2013年 | 140篇 |
2012年 | 158篇 |
2011年 | 207篇 |
2010年 | 87篇 |
2009年 | 76篇 |
2008年 | 144篇 |
2007年 | 146篇 |
2006年 | 103篇 |
2005年 | 110篇 |
2004年 | 105篇 |
2003年 | 108篇 |
2002年 | 83篇 |
2001年 | 60篇 |
2000年 | 67篇 |
1999年 | 51篇 |
1998年 | 17篇 |
1997年 | 21篇 |
1996年 | 14篇 |
1994年 | 18篇 |
1993年 | 13篇 |
1992年 | 32篇 |
1991年 | 40篇 |
1990年 | 37篇 |
1989年 | 39篇 |
1988年 | 26篇 |
1987年 | 34篇 |
1986年 | 28篇 |
1985年 | 32篇 |
1984年 | 29篇 |
1983年 | 20篇 |
1979年 | 24篇 |
1978年 | 14篇 |
1977年 | 23篇 |
1974年 | 17篇 |
1973年 | 23篇 |
1972年 | 20篇 |
1971年 | 14篇 |
1970年 | 19篇 |
1969年 | 24篇 |
1968年 | 13篇 |
1966年 | 12篇 |
排序方式: 共有2940条查询结果,搜索用时 15 毫秒
31.
Resistance in the tubers of potato clones with various levels of foliar multigenic resistance toPhytophthora infestans was measured to detect possible correlations between tuber and foliar resistance. A highly significant correlation was found using wound-healed tuber tissues. High levels of tuber resistance were detected in most foliar-resistant clones when inoculations with race 1,2,3,4 were made after 24–48 hours of wound periderm formation at 20 C. The resistance of wound-healed tissues increased as the time between wounding and inoculation increased. This increase in resistance was significantly greater for clones with foliar resistance than for clones with susceptible foliage. 相似文献
32.
Eun Young Park Byung‐Kee Baik Stephen Machado Hero T. Gollany E. Patrick Fuerst 《Cereal Chemistry》2015,92(3):332-338
The effects of no‐till versus conventional farming practices were evaluated on soft wheat functional and nutritional characteristics, including kernel physical properties, whole wheat composition, antioxidant activity, and end‐product quality. Soft white winter wheat cultivar ORCF 102 was evaluated over a two‐year period from three long‐term replicated no‐till versus conventional tillage studies in Oregon. Wheat from the no‐till cropping systems generally had greater test weight, kernel diameter, and kernel weight and had softer kernels compared with wheat from the conventional tillage systems. Compared with the conventional systems, no‐till whole wheat flour had lower protein and SDS sedimentation volume. Ash content as well as most minerals measured (calcium, copper, iron, magnesium, and zinc), except for manganese and phosphorus, were generally slightly lower in no‐till than in conventional wheat. Whole wheat flour from the no‐till cropping systems generally had slightly lower total phenolic content and total antioxidant capacity. Milling properties, including flour yield, break flour yield, and mill score, were not affected by tillage systems. Refined flour from no‐till systems had lower protein, SDS sedimentation volume, and lactic acid and sucrose solvent retention capacities compared with flour from conventional tillage. No‐till wheat generally had greater sugar‐snap cookie diameter than conventionally tilled wheat. In conclusion, no‐till soft white winter wheat generally had slightly reduced nutritional properties (protein, ash, most minerals, and total antioxidant content) compared with wheat from conventionally tilled systems, and it had equivalent or sometimes superior functional properties for baking cookie‐type products. 相似文献
33.
Mary R. Arkoosh Joseph P. Dietrich Mary Beth Rew Wendy Olson Graham Young Frederick W. Goetz 《Aquaculture Research》2018,49(1):205-216
Wild sablefish, Anoplopoma fimbria, are a valuable commercial species whose populations are declining. Fortunately, sablefish are excellent species for commercial aquaculture. Sablefish raised under high‐density conditions in the marine environment require the use of efficacious vaccines to control disease. Sablefish impacted by disease in net pens may have poor flesh quality and high mortality during grow‐out. As a result, disease can cause financial hardship for sablefish aquaculture operators. The efficacy of a multivalent vaccine preparation for sablefish, administered either by intraperitoneal (i.p.) injection or by immersion, against atypical and typical Aeromonas salmonicida, the causative agents of atypical and typical furunculosis, respectively, was examined. A. salmonicida can affect sablefish at any age and size. Consequently, an efficacious vaccine that can be appropriately and optimally administered to all life stages is desirable. Sablefish vaccinated by immersion at ~1.5 or ~4.5 g with a whole‐cell multivalent vaccine were not protected against either typical or atypical A. salmonicida. Factors that may have contributed to the ineffectiveness of the immersion vaccine are discussed. By contrast, the relative per cent survival (RPS) or potency of the whole‐cell multivalent vaccine injected i.p. in juvenile sablefish at ~50 g against typical and atypical A. salmonicida was 94.3% and 81.7% respectively. The high RPS values indicated that the vaccine successfully initiated an immune response in sablefish upon a second encounter with the pathogen. 相似文献
34.
Tae Hwan Jun Min Ji Kim Sungyoun Kim Young Hwa Jung Hak-Ryong Moon Kwang-Soo Kim 《Water, air, and soil pollution》2017,228(3):110
Activated carbon-coated electrode was developed and applied in electrostatic precipitator to remove volatile organic compound gases simultaneously with dust particles from a contaminated air. The activated carbon coating mixture was made up of powdered activated carbon (AC), carbon black (CB), and polyvinyl acetate (PVA), and methanol was added as a solvent to control the thickness of the mixture for best coating performance. During the coating process, the Brunauer-Emmett-Teller (BET) surface decreased to 86% of the original AC while pore volume percentages of macro pore increased, compared to micro- and meso-sized pores. The adsorption isotherm of benzene, toluene, ethyl benzene, and xylene (BTEX) gases onto the original AC and AC coating mixture (AC thoroughly mixed with PVA and methanol for coating and powdered again after dry) were tested and compared to each other, and it was found that both isotherm were best fitted to Freundlich and Langmuir isotherm with the order of adsorption capacities; ethyl benzene?>?m-xylene?>?toluene?>?benzene. The difference between adsorption capacities was clearer with the absorbent AC but became little with the AC coating mixture. In removing BTEX at increasing linear velocities up to 6.7 cm/s, it appeared that the surface area of AC electrode was directly proportional to its removal rate of BTEX. The thermal desorption was applied to regenerate the AC electrode, and 200 °C was found to be most efficient for benzene desorption, but higher temperature would be required for entire BTEX gases desorption. 相似文献
35.
Skin lesions on the ears and inguinal and axillary regions of a number of adult animals within a captive population of the endangered bridled nailtail wallaby ( Onychogalea fraenata ) were associated with the trombiculid mite, Eutrombicula hirsti . The local inflammatory response of these Australian marsupials is described. 相似文献
36.
正Many proteins are regulated by post-translational modifications,such as the reversible covalent attachment of ubiquitin and ubiquitin-like proteins in eukaryotes(Kerscher et al, 2006). Post-translational modification of proteins by the SUMO protein family is involved in diverse cellular processes, including development, hormonal responses, and biotic and abiotic stress signaling(Park et al, 2011). SUMO modification can modulate protein-protein interactions, intracellular localization or the activities of the protein(Gareau and Lima, 2010). 相似文献
37.
Sohee Kim Tu Cam Le Sang-Ah Han Prima F. Hillman Ahreum Hong Sunghoon Hwang Young Eun Du Hiyoung Kim Dong-Chan Oh Sun-Shin Cha Jihye Lee Sang-Jip Nam William Fenical 《Marine drugs》2022,20(1)
Analysis of the chemical components from the culture broth of the marine bacterium Saccharomonospora sp. CNQ-490 has yielded three novel compounds: saccharobisindole (1), neoasterric methyl ester (2), and 7-chloro-4(1H)-quinolone (3), in addition to acremonidine E (4), pinselin (5), penicitrinon A (6), and penicitrinon E (7). The chemical structures of the three novel compounds were elucidated by the interpretation of 1D, 2D nuclear magnetic resonance (NMR), and high-resolution mass spectrometry (HRMS) data. Compound 2 generated weak inhibition activity against Bacillus subtilis KCTC2441 and Staphylococcus aureus KCTC1927 at concentrations of 32 μg/mL and 64 μg/mL, respectively, whereas compounds 1 and 3 did not have any observable effects. In addition, compound 2 displayed weak anti-quorum sensing (QS) effects against S. aureus KCTC1927 and Micrococcus luteus SCO560. 相似文献
38.
Inja Yeon Mi Young SongMyoung Ho Sohn Hak Jin HwangYang Jae Im Do Hoon KimHee Won Park Chang Ik Zhang 《Fisheries Research》2011,112(3):179-188
Landings in the blue crab, Portunus trituberculatus, fishery in Korean waters of the Yellow Sea have declined substantially from 11,000 t in the 1980s to 2,300 t in 2004. Blue crab habitat quality in the Yellow Sea has been degraded by anthropogenic activities including sand mining, land reclamation, and coastal pollution. Various traditional management measures have been implemented, including closed seasons during spawning and size limits, but these measures alone have been unsuccessful to conserve blue crab stocks. Consequently, a total allowable catch and a stock-rebuilding program using an ecosystem-based management approach were implemented in 2003 and 2006, respectively to rebuild blue crab stocks and restore habitats. This program involved assessment of both blue crab stock status and trammel-net fishery impacts at an ecosystem-level using an ecosystem-based fisheries assessment method (
[Zhang et al., 2009] and [Zhang et al., 2010]), which considered fishery data from catch and effort time-series, crab population biology, and ecosystem characteristics, including habitats and environmental conditions. Recent (2008) management status indices have shown significant positive change compared to conditions in 2000 with respect to sustainability of the stock and fishery and with regards to biodiversity and ecosystem habitat quality. 相似文献
39.
The biochemical and gel properties of Pacific sardine and Pacific mackerel were characterized as affected by preparation and cooking methods. Four to eight times more salt soluble proteins were extracted from water-washed paste than fish protein isolate (FPI) paste. Higher total sulfhydryl content was measured in FPI, indicating the exposure of sulfhydryl groups during alkaline extraction. Comparing gel properties based on two cooking methods (slow and fast), the two pelagic fish proteins performed quite differently. Heating rate did not differentiate between surimi and FPI gels from sardine. However, mackerel exhibited higher texture values when using the fast cooking method, indicating the presence of high levels of proteolytic enzymes. Water-washed surimi gels were whiter than FPI for both species. Water retention ability appeared to be higher with mackerel than sardine, regardless of isolation and cooking method. Sodium dodecyl sulfate polyacrylamide gel eletrophoresis (SDS-PAGE) also supported a difference in processing chemistry and thermal behavior between two methods for protein isolation and cooking, respectively. 相似文献
40.
This study investigates the effects of embryonic exposure to two different antioxidants on growth and development in fish. Zebrafish (Danio rerio) embryos (100 per group) were exposed to lipoic acid (LA, 6–12 μM) or ascorbic acid (AA, 100–200 μM) and the hatching rate, standard lengths (SL) at hatching, development and growth post‐hatching monitored. The SLs at hatching were increased (P<0.05) in both antioxidant‐exposed groups relative to the controls, with no effect on yolk reserves. This enhanced development persisted up to 15 days post hatching. At hatching, cell proliferation rates (P<0.0005) and basic fibroblast growth factor (P<0.001), were greater in the antioxidant‐exposed fish than in the controls (0 μM antioxidant); no oxidative DNA damage was detected (P>0.05). Activity of the endogenous antioxidant enzyme superoxide dismutase was greater (P<0.001) in LA‐treated fish than in the controls. The results suggest that embryonic treatment of zebrafish with LA or AA during embryogenesis enhanced cell proliferation, leading to increased somatic growth in the larval stages, persisting into the juvenile stage. The findings support the treatment of embryonic fish with antioxidants for enhanced results in aquaculture. 相似文献