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141.
本研究报道沙棘(胡颓子科)对雄性白化病白鼠由铬诱导氧化胁迫的抗氧化活性。氧化胁迫通过对小白鼠进行强制性喂养30 d,以浓度为30 m g/kg的铬相对体重比例的重铬酸钾盐实现。铬促使体重下降,而却明显增加了器官与体重比例。铬处理明显减少了谷胱甘肽的降低,增加了丙二醛和肌氨酸磷酸激酶的水平;而且它还加强了血清中谷氨酸草酰乙酸转移酶和谷氨酸丙酮酸转移酶的浓度。用不同剂量的沙棘叶子提取物(乙醇提取)对保护铬元素诱导的氧化胁迫进行了评估,结果表明叶子提取物在浓度为100到250 m g/kg铬与体重比的情况下可以明显保护动物避免由铬所诱导的氧化伤害。 相似文献
142.
Pritam Singh 《Forest Pathology》1989,19(3):129-143
This article describes the most important biotechnological research in major tree diseases of Canadian forests and discusses the role of biotechnology in the management of forest diseases. A brief information on Canada's forest resources and the damage caused by these diseases is also included. 相似文献
143.
Priyanka Pal Narpinder Singh Parmeet Kaur Amritpal Kaur Amardeep Singh Virdi Naincy Parmar 《Cereal Chemistry》2016,93(6):584-592
Physical characteristics, amino acids composition, protein profiling, pasting characteristics, and phenolic compounds of brown rice (BR) and germinated brown rice (GBR) from different paddy cultivars (PB1, PS44, PB1509, PB1121, and PS5) were investigated. L* (lightness) decreased, but a* (redness and greenness) and b* (yellowness and blueness) increased with germination. Protein and ash content increased, whereas fat and amylose contents decreased with germination. GBR showed lower hardness and gumminess than BR. Foam stability and water absorption capacity from GBR flour were higher compared with BR flour. Accumulation of γ‐aminobutyric acid, histidine, arginine, proline, methionine, and acidic amino acids increased significantly with germination, and increase was related to change in accumulation of glutelin and prolamins. The accumulation of prolamins and glutelin acidic and basic subunits decreased with germination. GBR flour showed lower pasting viscosities compared with BR flour. Ferulic acid, p‐coumaric acid, and quercetin were present in both fractions of the bound form. GBR showed improved nutritional quality that varied in different cultivars. PB1121 was observed to be the best for producing GBR owing to greater changes brought in protein content, essential amino acids, catechin, chlorogenic acid, protocatechuic acid, vanillic acid, and foam stability. 相似文献
144.
V. Sivakumar R. Anandalakshmi R. R. Warrier B. G. Singh Mulualem Tigabu P. C. Odén 《New Forests》2007,34(3):281-291
The germination of Casuarina equisetifolia Forst seed lots is low (40–50%) even when freshly collected. This study aimed at upgrading the germination performance by
removing non-germinable seeds using petroleum flotation technique. Seeds collected from 19 individual trees in seedling seed
orchards in India were assessed using X-ray to determine the proportion of different seed lot fractions. The feasibility of
petroleum ether as a separation medium was tested. Morphological characters of floating and sunken seeds were further studied
using image analysis technique to examine their effects on the separation efficiency. The X-ray analysis revealed a large
quantity of shrivelled, empty and insect-damaged seeds, altogether accounting 50%, which were the causes of low percentage
germination of un-graded seed lots (48%). Petroleum flotation resulted in 90% germination in the sunken fraction and 4% in
the floating fraction. The separation was distinct for most seed lots, except few seed lots that had relatively low germination
in the sunken fractions and more than 10% germination in the floating fractions. As a whole, petroleum flotation appears to
be a feasible technique to upgrade the germination of C. equisetifolia seed lots, and its efficacy is influenced by wing surface area, seed density and wing quotient of filled and empty seeds. 相似文献
145.
Seven sterols and triterpenoids have been isolated from H. ellipticum and tested for their antimicrobial activity. 相似文献
146.
Agroforestry trees are now well known to play a central role in the build up of nutrients pools and their transformations
similar to that of forest ecosystem, however, information on the potential of homegarden trees accumulating and releasing
nitrogen (mineralization) is lacking. The present study reports seasonal variations in pool sizes of mineral N (NH4+-N and NO3−-N), and net N-mineralization rate in relation to rainfall and temperature under coconut (Cocos nucifera L.), clove (Eugenia caryophyllata Thunb) and nutmeg (Myristica fragrans Houtt. Nees) trees in a coconut-spice trees plantation for two annual cycles in the equatorial humid climate of South Andaman
Island of India. Concentration of NH4+-N was the highest during wet season (May–October) and the lowest during post-wet season (November–January) under all the
tree species. On the contrary, concentration of NO3−-N was the lowest in the wet season and the highest during the post-wet season. However, concentrations of the mineral N were
the highest under the nutmeg and the lowest under the coconut trees. Like the pool sizes, mean annual mineralization was the
highest under the nutmeg (561 mg kg−1 yr−1) and the lowest under the coconut trees (393 mg kg−1 yr−1). Rate of mineralization was the highest during the post-wet season and the lowest during the dry season (February–April)
under all the tree species. High rainfall during the wet season, however, reduced the rate of nitrification under all the
tree species. The mean annual mineralization was logarithmically related with rainfall amount and mean monthly temperature. 相似文献
147.
Pritam Singh 《Forest Pathology》1980,10(7):420-431
Inoculation of five softwood provenances have revealed that they vary considerably with regard to their percent infection, percent mortality, severity of disease symptoms and progress of infection. Sitka spruce was the most susceptible species and served as a better substrate for further development of mycelium and rhizomorphs as compared to Norway and black spruces and Scots pine. The fungus always entered through uninjured surface of root collar and/or roots, the latter with more than 2 mm diameter. There was a conspicuous reduction m the total and annual growth in height in A. mellea-infected seedlings. 相似文献
148.
A new phorbol diester, 13-O-myristyl-20-O-acetyl-12-deoxyphorbol (1), has been isolated from the benzene extract of the heartwood of Aleurites moluccana. In addition, hentriacontane, 6,7-dimethoxycoumarin, 5,6,7-trimethoxycoumarin and beta-sitostenone are being reported for the first time from this species. 相似文献
149.
We used a null-balance porometer to measure leaf conductance of mature and primary leaves of natural seedlings, saplings,
and trees ofPinus roxburghii (chir) during autumn at four sites at 1,320–1,930 m elevation in the central Himalaya of India. Our hypothesis that primary
leaves had higher leaf conductance than mature leaves (needles in fascicles), based on measurements in other pines, was rejected.
Comparisons on the same saplings and seedlings showed lower leaf conductance for primary leaves than for mature leaves. Primary
leaves on seedlings and saplings also did not consistently have higher leaf conductance than mature leaves on near-by trees.
Mature leaves on seedlings, however, did often have higher conductance than mature leaves on nearby trees. Mean values for
leaf conductance (mmol m−2 s−1, based on total leaf surface area) ranged from 42–82 for mature leaves on trees, 60–121 for mature leaves on seedlings, and
28–67 for primary leaves on seedlings. Compared to published values for other pine species, conductance of mature leaves ofP. roxburghii is relatively low.
Funding for this study was provided by grants from the United States National Science Foundation, INT-9312052 and INT-9404043.
We appreciate the review of an early draft by Barbara Bond. 相似文献
150.
In 1991 and 1992 studies on Dalbergia sissoo Roxb. showed the availability of ample amount of viable seed from November to May. Viability of seeds collected from December to March was more than 90 per cent. There was a slight but significant decrease in germination from March to may. Again germination per cent was slightly and significantly decreased from May to July. Thereafter, seed availability and viability were got drastically reduced. Sufficient viable seed of Dalbergia sissoo Roxb. can be collected at any time from November to July. 相似文献