全文获取类型
收费全文 | 5756篇 |
免费 | 342篇 |
专业分类
林业 | 1048篇 |
农学 | 165篇 |
基础科学 | 10篇 |
1209篇 | |
综合类 | 553篇 |
农作物 | 145篇 |
水产渔业 | 212篇 |
畜牧兽医 | 2228篇 |
园艺 | 120篇 |
植物保护 | 408篇 |
出版年
2023年 | 35篇 |
2022年 | 37篇 |
2021年 | 82篇 |
2020年 | 81篇 |
2019年 | 44篇 |
2018年 | 187篇 |
2017年 | 177篇 |
2016年 | 159篇 |
2015年 | 137篇 |
2014年 | 155篇 |
2013年 | 373篇 |
2012年 | 326篇 |
2011年 | 351篇 |
2010年 | 164篇 |
2009年 | 148篇 |
2008年 | 287篇 |
2007年 | 315篇 |
2006年 | 308篇 |
2005年 | 263篇 |
2004年 | 257篇 |
2003年 | 277篇 |
2002年 | 219篇 |
2001年 | 184篇 |
2000年 | 177篇 |
1999年 | 107篇 |
1998年 | 38篇 |
1997年 | 37篇 |
1996年 | 48篇 |
1995年 | 74篇 |
1994年 | 43篇 |
1993年 | 23篇 |
1992年 | 27篇 |
1991年 | 23篇 |
1990年 | 32篇 |
1989年 | 26篇 |
1988年 | 29篇 |
1987年 | 16篇 |
1986年 | 33篇 |
1985年 | 34篇 |
1984年 | 24篇 |
1983年 | 23篇 |
1982年 | 15篇 |
1980年 | 27篇 |
1979年 | 15篇 |
1978年 | 16篇 |
1977年 | 25篇 |
1973年 | 19篇 |
1966年 | 16篇 |
1955年 | 14篇 |
1941年 | 14篇 |
排序方式: 共有6098条查询结果,搜索用时 31 毫秒
991.
992.
A. Göttlein H. Rodenkirchen K. H. Häberle R. Matyssek 《European Journal of Forest Research》2009,128(2):129-134
Since the year 2000 mature beech and spruce trees were treated in a field experiment with double ambient ozone concentrations.
Elevated ozone had no influence on average single leaf biomass and there were also no ozone effects on leaf nutrient concentrations
in climatic normal years. However, the extraordinary dry summer 2003 triggered significant differences between the fumigated
and control trees. For beech in the year after the drought event the control trees surprisingly had significantly lower foliar
levels of K and P than in former years, whereas the ozone exposed trees showed no significant nutritional effects. There are
indications, that the trees exposed to double ambient ozone were already adapted to higher ozone values, whereas the control
trees experienced extraordinary high ambient ozone concentrations in the dry and sunny summer 2003. For spruce in autumn 2003
and 2004 ozone treated trees had significantly higher foliar levels of K in current year needles than control trees, an effect
which cannot be thoroughly interpreted yet on the basis of the dataset available.
This article belongs to the special issue „Growth and defence of Norway spruce and European beech in pure and mixed stands“. 相似文献
993.
Marc O. Schäfer Wolfgang Ritter Jeff S. Pettis Peter E. A. Teal Peter Neumann 《Journal of pest science》2009,82(3):283-287
In honeybee, Apis mellifera, colonies infested with larval and adult small hive beetles (SHB), hive material, and in particular honey, tends to ferment,
probably due to SHB-associated yeasts such as the predominant Kodamaea ohmeri. Here, we test the effects of organic acids on K. ohmeri and on SHB-infested honey/pollen combs. Organic acids were applied at standard concentrations used by beekeepers to control
other pests. In laboratory tests, the growth of K. ohmeri was significantly inhibited by lactic, formic and acetic acids. Treatments of SHB-infested honey/pollen combs (N = 18 colonies) with acetic acid significantly increased mortality of adult SHB and treatments with formic acid significantly
reduced larval infestation. Our data suggest that treatment of honeybee colonies and storage rooms with organic acids could
also help in reducing SHB damage. 相似文献
994.
This article investigates the role of local knowledge in the policy approach of neo-endogenous rural development, which may be held by local and regional actors such as municipal and county level politicians, local and regional level administration, entrepreneurs as well as local third sector representatives. The main question addressed is whether local knowledge under this approach is merely mobilised or if rural development processes are even based on such knowledge, placing it at the centre of such policy. The relevance of this approach to forestry is also explored. The types of forest owners for which the neo-endogenous rural development approach is appropriate and the types that may have difficulties in coping with this cross-sectoral and area-based approach are especially examined. Using a case study design on the German Active Regions funding program it is shown that the neo-endogenous approach is most relevant to large private forest owners and small-scale corporate enterprises, but also has potential for small- and medium-sized private owners. Concerning the role of knowledge held by local and regional actors, the approach is shown to largely build on the use of local expertise, and hence policy acceptance increases. However, scientific knowledge as well as politics are found to play a major role in the use, production and interpretation of local knowledge. 相似文献
995.
Cell wall degradation is a crucial process within the malting process of barley. Therefore, the haplotype diversity of genes for two cell wall degrading enzymes, (1 → 3),(1 → 4)-β-d-Glucan-4-glucanohydrolase and (1 → 4)-β-Xylan-endohydrolase 1, was investigated and associations to malting quality parameters were performed. The (1 → 3),(1 → 4)-β-d-Glucan-4-glucanohydrolase gene glb2 had two major haplotypes defined by three SNPs and one INDEL, which explained 8.9 and 9.5% of the total variation of malt extract content and viscosity in the spring barley gene pool, respectively. The most significant associations of (1 → 4)-β-Xylan-endohydrolase 1 gene X-1 were found for diastatic power, saccharification VZ45 and soluble nitrogen with 18, 12 and 8% of the total variation explained by SNP3 in the spring barleys. High-throughput markers were developed for both genes which can be used for marker assisted selection. 相似文献
996.
L. Heermann M. Emmrich M. Heynen M. Dorow U. König J. Borcherding R. Arlinghaus 《Fisheries Management and Ecology》2013,20(2-3):187-200
Angling catch records are frequently used to reveal fish population developments. It is therefore important to understand the determinants of angling catches. This study focused on angler‐related, biotic and abiotic factors influencing catchability of Eurasian perch, Perca fluviatilis L. A multi‐lake (21 lakes) study based on angling diaries collected in Mecklenburg‐Vorpommern, Germany (2006/2007), found that angler‐related factors such as fishing experience, species preference and bait/lure type had a large impact on perch catch rates. Additionally, environmental conditions (nutritional status and water transparency) affected either the size or the number of perch caught by anglers. Catch rates varied seasonally, which was confirmed by an experimental fishery on a gravel pit (2008). This portion of the study showed that altered food availabilities in the course of the year caused food limitation in perch, which in turn facilitated high catch rates and female‐biased exploitation in autumn. It is concluded that both angler‐related and abiotic factors interact affecting perch catch rates and size of perch captured in recreational angling. 相似文献
997.
S. O. Handeland A. K. Imsland B. Th. Björnsson S. O. Stefansson M. Porter 《Fish physiology and biochemistry》2013,39(5):1079-1088
Melatonin implants were used to override natural melatonin rhythm in groups of juvenile Atlantic salmon, Salmo salar, raised at simulated natural photoperiod (SNP) and constant light (LL) from mid-March until end of August. The experiment contained also both sham control (with non-melatonin implants) and control (no implants). No differences were found in the experimental variables between these two control groups. Growth and food intake were negatively affected by melatonin implantation. Overall, higher GH levels were observed in the SNP melatonin-implanted group, whereas no differences in GH levels were seen between the SNP control, LL control, or the LL melatonin-implanted groups. Highest food intake was seen in the LL control group. No differences in food intake were recorded between the LL melatonin-implanted and SNP control groups. Gill Na+, K+, ATPase (NKA) activity was influenced by time as well as the interaction between photoperiod and time. No differences in gill NKA activity or plasma chloride levels following transfer to seawater were seen between the groups with melatonin implants and their controls. Based on the present results, it seems apparent that melatonin does play a role in regulating food intake and growth in Atlantic salmon smolts. 相似文献
998.
Comparative stability studies of poly(2-methyl-2-oxazoline) and poly(ethylene glycol) brush coatings
Pidhatika B Rodenstein M Chen Y Rakhmatullina E Mühlebach A Acikgöz C Textor M Konradi R 《Biointerphases》2012,7(1-4):1
Non-fouling surfaces that resist non-specific adsorption of proteins, bacteria, and higher organisms are of particular interest in diverse applications ranging from marine coatings to diagnostic devices and biomedical implants. Poly(ethylene glycol) (PEG) is the most frequently used polymer to impart surfaces with such non-fouling properties. Nevertheless, limitations in PEG stability have stimulated research on alternative polymers that are potentially more stable than PEG. Among them, we previously investigated poly(2-methyl-2-oxazoline) (PMOXA), a peptidomimetic polymer, and found that PMOXA shows excellent anti-fouling properties. Here, we compare the stability of films self-assembled from graft copolymers exposing a dense brush layer of PEG and PMOXA side chains, respectively, in physiological and oxidative media. Before media exposure both film types prevented the adsorption of full serum proteins to below the detection limit of optical waveguide in situ measurements. Before and after media exposure for up to 2 weeks, the total film thickness, chemical composition, and total adsorbed mass of the films were quantified using variable angle spectroscopic ellipsometry (VASE), X-ray photoelectron spectroscopy (XPS), and optical waveguide lightmode spectroscopy (OWLS), respectively. We found (i) that PMOXA graft copolymer films were significantly more stable than PEG graft copolymer films and kept their protein-repellent properties under all investigated conditions and (ii) that film degradation was due to side chain degradation rather than due to copolymer desorption. 相似文献
999.
ABSTRACTYogurt is a traditional dairy product widely consumed all over the world. Syneresis, which is a result of lower water holding capacity, is a big concern and an important quality parameter. In this study, the efficiency of locust bean gum and different gelatins (fish skin, fish scale, and bovine skin) in preventing syneresis was investigated. Samples were stored at 4°C for 2 weeks, a typical shelf life of yogurt, and analyzed periodically for quality parameters. Syneresis, viscosity, and water holding capacity of the control and gum added samples were almost identical, while gelatin added samples were generally significantly improved (p < 0.05). 相似文献
1000.
K. Köprücü 《Aquaculture Nutrition》2012,18(6):662-672
In the present study, it was examined whether variability in chemical composition of different cottonseed (Nazilli‐M39, Nazilli‐84 and Çukurova‐1518) meals (CSMs) and sunflower (Sanbro, Isera and Coban) meals (SFMs) had any effects on digestibility when fed to grass carp. Protein and energy digestibility of CSMs (83.2–86.8%; 88.7–92.5%) and SFMs (78.9–83.1%; 88.4–92%) had a coefficient of variation of 1.96% (CSMs) and 1.52% (SFMs) for protein and 1.93% (CSMs) and 1.82% (SFMs) for energy digestibility. Sum of amino acids digestibility of CSMs (83.1–86.5%) and SFMs (78.9–83.4%) had a coefficient of variation of 1.85% and 2.47%, respectively. Protein and energy digestibility of CSMs and SFMs was significantly positive affected by a range of compositional features including protein or sum of amino acids and phosphorus content, and significantly negative affected by fiber and carbohydrate contents in the test ingredients. This suggested that fiber and carbohydrate contents of CSMs and SFMs may also be influencing the nutritional value of its own protein or sum of amino acids. In conclusion, the relationship between plant protein meals protein content and its digestible value provides a good support for the development of a system of grain segregation by protein content and ingredient pricing according to that protein content. 相似文献