全文获取类型
收费全文 | 1204篇 |
免费 | 42篇 |
国内免费 | 3篇 |
专业分类
林业 | 92篇 |
农学 | 56篇 |
基础科学 | 16篇 |
217篇 | |
综合类 | 79篇 |
农作物 | 121篇 |
水产渔业 | 131篇 |
畜牧兽医 | 395篇 |
园艺 | 24篇 |
植物保护 | 118篇 |
出版年
2023年 | 14篇 |
2022年 | 36篇 |
2021年 | 55篇 |
2020年 | 71篇 |
2019年 | 60篇 |
2018年 | 46篇 |
2017年 | 49篇 |
2016年 | 46篇 |
2015年 | 50篇 |
2014年 | 50篇 |
2013年 | 101篇 |
2012年 | 78篇 |
2011年 | 93篇 |
2010年 | 43篇 |
2009年 | 24篇 |
2008年 | 53篇 |
2007年 | 49篇 |
2006年 | 29篇 |
2005年 | 26篇 |
2004年 | 32篇 |
2003年 | 27篇 |
2002年 | 23篇 |
2001年 | 10篇 |
2000年 | 11篇 |
1999年 | 10篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1991年 | 10篇 |
1990年 | 7篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 6篇 |
1981年 | 6篇 |
1979年 | 5篇 |
1976年 | 4篇 |
1975年 | 7篇 |
1973年 | 4篇 |
1972年 | 4篇 |
1971年 | 5篇 |
1970年 | 5篇 |
1969年 | 4篇 |
1967年 | 2篇 |
1966年 | 3篇 |
排序方式: 共有1249条查询结果,搜索用时 781 毫秒
91.
A separation system has been developed to permit the simultaneous analysis of major anthocyanins and stilbenes from berries of Vitis species in <1 h. The system makes use of separation by HPLC and detection by UV-visible absorption and fluorescence, for anthocyanins and stilbenes, respectively, with the two detection systems linked in series. Monitoring the absorption at 520 nm permits ready identification and quantification of major anthocyanins. Chromatograms derived from fluorescence (330 nm excitation/374 nm emission) produce less clear data for the piceids and resveratrols, which are present in much lower amounts; peaks for these compounds can be verified by means of external or internal standards. 相似文献
92.
Ahmed A. M. Awad Atef A. A. Sweed 《Communications in Soil Science and Plant Analysis》2020,51(8):1101-1113
ABSTRACT The objective of this study was to study the influence of three organic manures, farm yard manure (FYM), poultry manure (PLM), and pigeon manure (PGM), on soil physical and chemical properties on tuber yield of Jerusalem artichoke in a newly reclaimed saline calcareous soil. A field experiment was conducted applying the three manures, alone and/or in different combinations. Soils were investigated at surface (0–30 cm) and subsurface (30–60 cm) layers before and after planting, and analyzed for physical and chemical properties. The results indicated that the application of 31.5 kg ha?1 of PLM+10.5 kg of PGM T7 recorded highest available nitrogen, zinc, copper, and moisture content at the surface layer. The same results were obtained for iron and manganese at both layers. While, applying 21.0 kg ha?1 FYM+21.0 kg ha?1 PLM T10 recorded the best treatment for pH, phosphorus, zinc, copper, moisture content, and saturation percentage at the subsurface layer. Applying 21.0 kg ha?1 PGM + 10.5 kg ha?1 FYM+10.5 kg ha?1 PLM T15 recorded the best treatment for organic matter content and bulk density at surface layer and reduced the electrical conductivity and inulin tuber content at both layers. On the other hand, calcium carbonate and sodium adsorption ratio were reduced in both layers by applying 21.0 kg ha?1 PLM+10.5 kg ha?1 FYM+10.5 kg ha?1 PGM T14. The best treatment for tuber nitrogen content and total yield was obtained with applying 42.0 kg ha?1 PLM T2 only and 31.5 kg ha?1 FYM+10.5 kg ha?1 PLM T4, respectively. 相似文献
93.
Yagoub Ael-G Mohamed BE Ahmed AH El Tinay AH 《Journal of agricultural and food chemistry》2004,52(20):6143-6150
Furundu, a meat substitute, is traditionally prepared by cooking the karkade (Hibiscus sabdariffa L.) seed and then fermenting it for 9 days. Physicochemical and functional properties of raw and cooked seed and of furundu ferments were analyzed. Furundu preparation resulted in significant changes in karkade seed major nutrients. Total polyphenols and phytic acid were also reduced. The increase in total acidity and fat acidity coupled with a decrease in pH indicates microbial hydrolysis of the major nutrients; proteins, carbohydrates, and fats. In vitro digestibility of the seed proteins reached the maximum value (82.7%) at the sixth day of fermentation, but thereafter it significantly decreased. The effect of furundu preparation on N solubility profiles and functional properties, such as emulsification and foaming properties and other related parameters, is investigated in water and in 1 M NaCl extracts from defatted flour samples. The results show that cooking followed by fermentation affects proteins solubility in water and 1 M NaCl. The foaming capacity (FC) from the flour of raw seed decreased as a result of cooking. Fermentation for 9 days significantly increased the FC of the cooked seed, restoring the inherent value. Foam from fermented samples collapsed more rapidly during a period of 120 min as compared to the foam from raw and cooked karkade seeds; stability in 1 M NaCl was lower as compared to those in water. In water, the emulsion stability (ES) from the fermented samples was significantly higher than that of the raw seed flour. Addition of 1 M NaCl significantly decreased the ES of the fermented samples. 相似文献
94.
A W Ahmed V N Mallet M J Bertrand 《Journal of the Association of Official Analytical Chemists》1989,72(2):365-367
Methods are described for the determination of acidic herbicides and related compounds in water and soil. Eight acidic herbicides and related compounds were extracted from water using either dichloromethane or an XAD-2 resin column. The acidic moieties were derivatized with 2-cyanoethyldimethyl(diethyl)aminosilane. The derivatized compounds were separated using capillary gas chromatography and quantitated using a nitrogen-phosphorus detector. Extraction from water using dichloromethane or an XAD-2 resin column resulted in recoveries greater than 90% at 0.1 ppb with an average coefficient of variation (CV) of 6%. In soils extracted with aqueous acetonitrile-acetic acid and partitioned into dichloromethane, recoveries at 500 ppb were greater than 75% with an average CV of 3.3%. The methods are rapid and there are few interferences. 相似文献
95.
Muhammad Abdullah Jia Li Sidra Ghazanfar Jaleel Ahmed Imran Khan Mazhir Nadeem Ishaq 《东北农业大学学报(英文版)》2015,(2):80-86
Under the umbrella of WTO, the reduction in trade barriers has forced the policy makers to focus on the export competitiveness. Rice is an important source for foreign exchange earnings for the economy of Pakistan, keeping in mind of this fact, the competitiveness of Pakistan’s rice with other major exporters was examined by applying revealed competitive advantage. The domestic consumption trends of rice among the major rice exporting countries were also analyzed in the current study. The results revealed that as compare to other major exporters of rice in the world, Pakistan had high competitive and comparative advantage in the production of rice. The comparison of the movements in comparative advantage indices for Pakistan with the major world rice competitors/exporters showed that Pakistan possessed relatively high comparative and competitive advantages in rice production. The declining domestic per capita consumption of rice and increasing trends in competitiveness for Pakistan clearly revealed the expected potential of higher growth which meant that rice exports from Pakistan could continue to play an important role for the earnings of foreign exchange. In order to exploit the potential benefits of rice exports, we need to strengthen the competitiveness in rice sector of Pakistan. 相似文献
96.
Effect of soil drying on mucilage exudation and its water repellency: a new method to collect mucilage 下载免费PDF全文
Mutez A. Ahmed Maire Holz Susanne K. Woche Jörg Bachmann Andrea Carminati 《植物养料与土壤学杂志》2015,178(6):821-824
Despite the importance of mucilage for soil–plant relations, little is known about the effect of soil drying on mucilage exudation. We introduce a method to collect mucilage from maize growing in wet and dry soils. Mucilage was collected from brace roots. The amount of mucilage exuded did not change with soil water content and transpiration rate. Mucilage exuded in dry soils had a higher degree of hydrophobicity, suggesting that the wetting properties of mucilage change in response to soil drying. 相似文献
97.
Monica Rogers DVM Robert E. Cartee DVM MS William Miller DVM Ahmed K. Ibrahim MVSc PhD 《Veterinary radiology & ultrasound》1986,27(1):24-29
B-mode ultrasonography using a 7.5 megahertz (MHz ) transducer was performed on 95 equine cadaver eyes submerged in a water bath. Identification and measurement of the anterior to posterior diameters of the intraocular structures and of the axis bulbi was done. The dorsal ventral axis of the eye was also measured. The eyes were then frozen, sectioned in a saggital plane and the same measurements were made using calipers. Two sets of measurements were then compared statistically.
With the exception of the cornea and the dorsal ventral axis measurements of male horses there was no statistically significant difference in the measurements obtained by the two methods.
The use of B-mode ultrasonography at a frequency of 7.5 MHz to examine the architecture of the equine eye is suggested as a valuable clinical tool. Biometry of the intraocular structures at this frequency may be reasonably accurate. 相似文献
With the exception of the cornea and the dorsal ventral axis measurements of male horses there was no statistically significant difference in the measurements obtained by the two methods.
The use of B-mode ultrasonography at a frequency of 7.5 MH
98.
99.
Male and female Japanese quail (Coturnix coturnix japonica) were given intraperitoneal injections of [14C]DDT in ethanol at a rate of 13.4 mg/kg body wt. Fifty-six days later the tissues and droppings were analysed for total 14C and metabolites. The rate of loss of 14C in droppings was very similar in males and females. The maximal rate was reached on the third day, and 65–66% of the injected dose was voided by the fifty-sixth day. Ninety-three to ninety-four percent of the 14C in droppings and 83–90% of the 14C in tissues were extracted by solvents. Combined extracts from males and females were used for determination of DDT and its metabolites. Expressing all results as percentages of injected dose, the following were isolated from droppings: DDA (24%), DDT (3%), DDD (5.1%), DDE (11%), and uncharacterised polar metabolites (17%). Twenty-five percent of the dose was retained in the tissues and this was largely accounted for as DDT (10.4%) and DDE (10.5%). Of the total metabolites found 31% was DDE (almost equally divided between tissues and droppings) and 35% was DDA (almost entirely in droppings). Since DDD was not found in significant quantities in tissues, the substantial quantities in droppings were probably produced from DDT by the action of microorganisms. 相似文献
100.
Despite the intensive management and husbandry precautions, exotic pregnant heifers imported to the Gezira, Sudan, suffered excessive stress. Four of five heifers aborted due to stress. Death was due to pasteurellosis, babesiosis and heart water. 相似文献