全文获取类型
收费全文 | 1088篇 |
免费 | 68篇 |
国内免费 | 2篇 |
出版年
2023年 | 19篇 |
2022年 | 30篇 |
2021年 | 72篇 |
2020年 | 43篇 |
2019年 | 39篇 |
2018年 | 35篇 |
2017年 | 43篇 |
2016年 | 59篇 |
2015年 | 67篇 |
2014年 | 65篇 |
2013年 | 88篇 |
2012年 | 110篇 |
2011年 | 70篇 |
2010年 | 35篇 |
2009年 | 30篇 |
2008年 | 32篇 |
2007年 | 36篇 |
2006年 | 34篇 |
2005年 | 26篇 |
2004年 | 30篇 |
2003年 | 24篇 |
2002年 | 24篇 |
2001年 | 11篇 |
2000年 | 6篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1996年 | 3篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1991年 | 6篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1981年 | 4篇 |
1980年 | 8篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1970年 | 3篇 |
1969年 | 5篇 |
1968年 | 3篇 |
1966年 | 4篇 |
1965年 | 3篇 |
1964年 | 2篇 |
1963年 | 2篇 |
1962年 | 3篇 |
排序方式: 共有1158条查询结果,搜索用时 15 毫秒
1.
Fazile Nur Ekinci Akdemir Berna Karagöz Recep Soslu Saleh H. Alwasel 《Journal of enzyme inhibition and medicinal chemistry》2016,31(6):114-118
AbstractThe antioxidant effects of ellagic acid (EA) and hesperidin (HES) against skeletal muscle ischemia/reperfusion injury (I/R) were performed. Hindlimb ischemia has been induced by tourniquet occlusion for 2?h on left hindlimb. At the end of ischemia, the tourniquate has been removed and initiated reperfusion for 2?h. EA (100?mg/kg) has been applied orally before ischemia/reperfusion in the EA?+?I/R group. HES (100?mg/kg) has been given orally in the HES?+?I/R group. The left gastrocnemius muscle has been harvested and stored immediately at??80?°C until assessed for the levels of MDA and antioxidant enzymes activities. MDA level has statistically increased in I/R group (p?<?0.05) compared to other groups. The muscle tissue antioxidant enzymes activities were lower than the other groups in the I/R group (p?<?0.05). EA and HES treatments significantly reversed the damage level in I/R, also activity of tissue SOD increased in the EA?+?I/R and HES?+?I/R groups. 相似文献
2.
The growth response ofCalopogonium caeruleum, a leguminous covercrop in plantation agriculture, to inoculation with two vesicular-arbuscular mycorrhizal (VAM) fungi was
investigated in five phosphorus (P)-deficient soils supplied with various levels of rock phosphate. Significant shoot yield
increases over the uninoculated controls were obtained in most sterilised or unsterilised soils at all applied P levels, although
the inoculant VAM fungi differed in their effectiveness in the soils used. Responses in mycorrhizal root infections, P and
nitrogen (N) concentrations in tops and plant nodulation varied. The results are discussed in relation to the edaphic environment
of the mycorrhizal association. 相似文献
3.
A new saponin, leucasin, has been isolated from Leucas nutans and characterized on the basis of chemical investigation and spectroscopic studies as 3-O-[β-
-glucopyranosyl(1→2)β-
-glucopyranosyl]2,3β-dihydroxylup-20(29)-ene. Lupeol palmitate, sitosterol and stigmasterol were also isolated. 相似文献
4.
A new saponin, leucasin, has been isolated from Leucas nutans and characterized on the basis of chemical investigation and spectroscopic studies as 3-O-[β-
-glucopyranosyl(1→2)β-
-glucopyranosyl]2α,3β-dihydroxylup-20(29)-ene. Lupeol palmitate, sitosterol and stigmasterol were also isolated. 相似文献
5.
Viqar Uddin Ahmad Mohammad Ghani Shah Faryal Vali Mohammad Nargis Ismail Mushtaq Noorwala 《Phytochemistry》1991,30(12)
A new flavone glucoside macrophylloside has been isolated from the whole plant of Primula macrophylla and its structure was determined by spectroscopic methods as 2′-hydroxy-7-O-β-
-glucopyranosyloxyflavone. Sitosterol glucoside was also isolated for the first time from this plant. 相似文献
6.
U Nur 《Theoretical population biology》1974,5(2):143-147
An equation is derived giving the changes per generation in the frequency of alleles affecting the sex ratio. The alleles considered are assumed to be those of an autosomal locus and to act only in one sex. The results indicate that alleles determining the production of more males should always be more common in males than in females. 相似文献
7.
Uzi Nur 《Chromosoma》1961,12(1):272-279
Summary Unequal bivalents were found in two of four populations of the short horned grasshopper, Calliptamus palaestinensis
bdhr. sampled in Israel.The inequality of the homologues was due to an extra segment which was heterochromatic and apparently terminal. Pairing configurations at pachytene and position of chiasmata at later stages revealed however that the extra segment was interstitial, and the long member terminated in a minute segment homologous to the terminal part of its normal partner. The percentage of reductional divisions at anaphase I corresponded well with the percentage of terminal chiasmata (i.e. distal to the extra segment) observed at diakinesis.The assumption of an interstitial position of the extra segment would explain the previously puzzling examples of unequal bivalents in Orthoptera whose reductional divisions have not been readily accounted for otherwise. 相似文献
8.
Nadav Nur 《Evolution; international journal of organic evolution》1988,42(2):351-362
To determine how the cost of reproduction varies with brood size, a population of blue tits (Parus caeruleus) breeding in Wytham Wood, England, was manipulated over a three year period. Two hundred sixteen pairs were randomly assigned 3, 6, 9, 12, or 15 nestlings; nestlings were exchanged soon after hatching. Survival of adult females (as measured by the proportion recaptured in the following winter and/or spring) declined significantly with increasing brood size in two out of three years; there was significant year-to-year variation in the relationship of recapture rate to brood size. Mean female recapture rates (averaged over the three years) declined in a linear fashion (P < 0.01). There was no significant linear or curvilinear relationship between male-recapture rate and brood size in any of the three years nor was there a significant linear or curvilinear relationship for the data averaged over the three years. Nevertheless, recapture proportions for males differed significantly with respect to brood size (χ2 test, P < 0.05). The possibility that experimental brood size influences subsequent dispersal (and therefore biases measures of survival based on recapture rates to differing degrees) was examined by comparing distances moved by breeding adults from one year to the next. There was no relationship between brood size and dispersal distance within the study area for either sex, except that females given broods of three were significantly more likely to move more than 300 m than were those given broods of 6–15 young. Both males and females showed evidence of a cost with respect to future fecundity: as brood size increased, the number of surviving offspring produced in the following year decreased from 1.5–1.6 (for adults that had reared 3–6 young) to 0.4 (for those that had reared 15 young). The relationship of future reproductive success to experimental brood size did not differ among years or between the sexes. The number of eggs laid and number of young hatched in year n + 1 did not differ significantly with respect to brood size in year n; rather, differences in future fecundity reflected differences in the survival prospects of young reared in year n + 1. 相似文献
9.
Ersilia Cassano Marco Macchia Mahmud Hamdan Paolo Rovero 《Letters in Peptide Science》1996,3(3):117-120
Summary We describe a new solid-phase strategy for the selective reduction of the C=N bond in peptide oximes using a trialkylsilane in trifluoroacetic acid. The reduction is performed directly on the resin-bound peptide, with concomitant cleavage of the peptide from the resin and deblocking of protected side chains. 相似文献
10.
Azospirillum brasilense was attracted to capillaries containing either phosphate buffer, distilled water, or saline. The number of bacteria in these capillaries was 3–4×104, after 1 h of incubation. In the presence of phosphate buffer + attractants, the number of cells accumulated in the capillary increased only to 5×104–1.1×105 cells. It was not possible, therefore, to measure chemotaxis inA. brasilense as distinct from aerotaxis by the capillary method. Chemotaxis was observed in semi-solid agar plates and was determined by a growth band oriented towards the attractant. Positive chemotactic response was obtained with peptone, tryptone, yeast extract, amino acids, organic acids, arabinose and galactose. 相似文献