全文获取类型
收费全文 | 18901篇 |
免费 | 187篇 |
国内免费 | 2篇 |
专业分类
林业 | 3822篇 |
农学 | 1345篇 |
基础科学 | 149篇 |
3197篇 | |
综合类 | 1054篇 |
农作物 | 2194篇 |
水产渔业 | 1984篇 |
畜牧兽医 | 2131篇 |
园艺 | 1174篇 |
植物保护 | 2040篇 |
出版年
2024年 | 5篇 |
2023年 | 27篇 |
2022年 | 46篇 |
2021年 | 78篇 |
2020年 | 91篇 |
2019年 | 112篇 |
2018年 | 2811篇 |
2017年 | 2768篇 |
2016年 | 1275篇 |
2015年 | 137篇 |
2014年 | 123篇 |
2013年 | 132篇 |
2012年 | 980篇 |
2011年 | 2332篇 |
2010年 | 2198篇 |
2009年 | 1325篇 |
2008年 | 1479篇 |
2007年 | 1718篇 |
2006年 | 202篇 |
2005年 | 248篇 |
2004年 | 228篇 |
2003年 | 288篇 |
2002年 | 167篇 |
2001年 | 23篇 |
2000年 | 61篇 |
1999年 | 24篇 |
1998年 | 16篇 |
1997年 | 13篇 |
1996年 | 4篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 18篇 |
1992年 | 14篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1988年 | 12篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 7篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1971年 | 3篇 |
1968年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 272 毫秒
801.
802.
Jiwan P Palta 《Potato Research》2010,53(4):267-275
Calcium plays a major role in plant growth and development and in the maintenance and modulation of various cell functions,
especially related to membrane structure and function and to cell wall structure. Calcium stabilizes cell membranes by bridging
polar head groups of phospholipids at the membrane surface. Calcium is also an integral part of the cell wall where it provides
stable intra-molecular linkages between pectin molecules, resulting in cell wall rigidity. A change in the cytosolic calcium
concentration is also known to provide a cellular signal that regulates metabolism and mediates plant responses to stresses. 相似文献
803.
Objectives: Mechanical evaluation of the equine laryngoplasty. Study Design: Experimental. Animal Population: Cadaveric cricoid (n=36) and arytenoid (46) cartilages. Methods: Arytenoid and cricoid cartilage specimens were embedded for testing. Suture material (2 Ethilon®, 5 Ethibond®, or 5 Fiberwire®) was inserted simulating laryngoplasty procedures. Constructs were evaluated in single or cyclic loading. Single cycle tests recorded load at failure and stiffness. Cyclical tests recorded displacement after 10,000 cycles. ANOVA and t‐tests were used (significance P<.05). Results: The arytenoid Ethibond® (241.10±47.67 N) constructs were stronger in single cycle than Ethilon® (133.85±27.89 N) and Fiberwire® (142.67±32.40 N). The cricoid Ethibond® (220.39±49.11 N) constructs were stronger than Ethilon® (171.93±21.19). The stiffness of Ethilon® constructs was lower in both the arytenoid and cricoid compared with Ethibond® and Fiberwire®. The arytenoids failed at a lower load than the cricoids for Ethilon® and Fiberwire® but not Ethibond® constructs. In cyclic testing complete failure of either cartilage did not occur. Arytenoid Ethibond® constructs (0.43±0.21 mm) had less distraction than Ethilon® (0.92±0.41 mm) and a trend for less compared with Fiberwire® (0.83±0.43 mm; P=.0513). Cricoid Ethibond® constructs (0.45±0.18 mm) had less distraction compared with Ethilon® (1.04±0.30 mm) and Fiberwire® (0.97±0.45 mm). Conclusions: Ethibond® was superior to Ethilon® and Fiberwire® constructs in vitro. Clinical Relevance: Abduction loss after laryngoplasty is a common complication. The results of this study suggest that the use of Ethibond® should minimize abduction loss after surgery relative to the other materials tested. 相似文献
804.
Kimihiko Hyakumura 《Small-Scale Forestry》2010,9(3):349-367
A progressive part of protected area management program in Lao PDR is a land and forest allocation program which contains
critical elements that delegate right of land and forest use to local people. This study analyzes the gap between the original
intent of the program and its actual implementation by local officials in Phou Xang He protected area, and discusses policy
issues that need to be addressed. It appears that several types of non-compliance with regulations by local people have occurred,
with local officials tacitly ignoring infractions. By switching viewpoints, however, it appears that the local officials permit
these infractions as a way of allowing local people to secure their livelihoods. As constraints on the realities of land and
forest use vary widely in and around villages in different locales, there is a need for government to allow local officials
flexibility in implementing policies. 相似文献
805.
The concept of continuity/discontinuity is applied to the riparian vegetation of the corridor of the River Adour (S.W. France), in order to precisely define longitudinal structure, and to test the degree of floristic continuity of the fluvial axis. The measure of floristic connectance along the river course is based on presence/absence data, and is applied to successive stretches of the river, at various resolution levels. This analysis shows that the River Adour corridor cannot be assumed to be floristically continuous. The observed discontinuities may correspond to two types of change in the riparian vegetation: zones of slow change (high level of floristic connectance) or zones of sharp change (low level of floristic connectance). 相似文献
806.
In a feeding experiment with 48 growing pigs 16% high glucosinolate rapeseed meal (HGRSM) (136 mumol glucosinolates + aglucones/kg dry matter, DM) or low glucosinolate (LG) RSM (48 mumol glucosinolates + aglucones/kg DM) in the feed were compared with 14% soya-bean meal (SBM) in each case. It were established 24 pairs of animals, which received the same quantity of the isonitrogenous but not isocaloric diets with SBM and the both RSM (pair fed). Four of the 2.12 animal pairs were not given supplementary I, four received 0.25 mg supplementary I/kg feed. Further four animals which were fed on LGRSM or HGRSM were provided with 0.0625 or 1 mg supplementary I/kg feed. In case of high glucosinolate intake (HGRSM) the lacking I supplementation decreased feed intake and growth and led to remarkable I deficiency symptoms from the fifth week onwards. The 2/3 lower glucosinolate dosage of the LGRSM diet also decreased performance and provoked I deficiency, however significantly later. The investigated I dosages (greater than 0.0625 mg/kg feed) did not effect the performance. In the experiment the eight animals which received LGRSM with supplementary I consumed 13% more feed than animals fed on HGRSM (P less than 0.05). The additional weight gain was 20% (P less than 0.05). Comparing the live weight gain of the SBM and RSM fed animals (pair fed) there was a significant increase of 9% versus the HGRSM groups and 5% versus the LGRSM groups. 相似文献
807.
808.
Relationships between landcover proportion and indices of landscape spatial pattern 总被引:10,自引:0,他引:10
Recent studies have related percolation theory and critical phenomena to the spatial pattern of landscapes. We generated simulated
landscapes of forest and non-forest landcover to investigate the relationship between the proportion of forest (Pi) and indices of patch spatial pattern. One set of landscapes was generated by randomly assigning each pixel independently
of other pixels, and a second set was generated by randomly assigning rectilinear clumps of pixels. Indices of spatial pattern
were calculated and plotted against Pi. The random-clump landscapes were also compared with real agricultural landscapes.
The results support the use of percolation models as neutral models in landscape ecology, and the performance of the indices
studied with these neutral models can be used to help interpret those indices calculated for real landscapes. 相似文献
809.
In three experiments with fattening pigs the supplementation of a ration with 8% rapeseed oilmeal (RSO) with 1 mg J/kg resulted in an increased weight gain per day of 31, 94 and 87%. On the other hand, only 83, 76 and 84% of the weight gain of the soybean oilmeal control groups were achieved. The additional supply with 250 mg Cu (experiments II and III) increased the weight gain to 84 and 96% in comparison to the unsupplemented control groups. The combination of J + Cu + Zn lead to the same performance as that of J + Cu (experiment III). In the RSO groups without J-supplement changes in body proportions and parakeratosis could be observed after approximately equal to 7 weeks. After the sole supplementation of Cu these symptoms occurred approximately equal to 4 weeks later. In vitro, the supplementation of RSO with a CuSO4 solution resulted in a decrease of vinylthiooxazolidon and isothiocyanate in line with the CuSO4-concentration. 0.2 mg J/kg feed (experiment III) resulted in the same fattening performance as the supplementation of the ration with 1 mg J and outwardly visible deficiency symptoms. The results show that Cu, depending on its quota, results in a decrease of goitrogenics in the feed and that J and Cu supplementation to rations with rapeseed oilmeal have an additive effect and that parakeratosis can be prevented by J-supplementation. 相似文献
810.