全文获取类型
收费全文 | 9902篇 |
免费 | 848篇 |
国内免费 | 9篇 |
出版年
2021年 | 109篇 |
2020年 | 52篇 |
2019年 | 73篇 |
2018年 | 101篇 |
2017年 | 91篇 |
2016年 | 158篇 |
2015年 | 263篇 |
2014年 | 341篇 |
2013年 | 466篇 |
2012年 | 554篇 |
2011年 | 565篇 |
2010年 | 388篇 |
2009年 | 362篇 |
2008年 | 563篇 |
2007年 | 553篇 |
2006年 | 536篇 |
2005年 | 555篇 |
2004年 | 515篇 |
2003年 | 540篇 |
2002年 | 485篇 |
2001年 | 128篇 |
2000年 | 137篇 |
1999年 | 189篇 |
1998年 | 169篇 |
1997年 | 138篇 |
1996年 | 124篇 |
1995年 | 109篇 |
1994年 | 108篇 |
1993年 | 98篇 |
1992年 | 116篇 |
1991年 | 113篇 |
1990年 | 112篇 |
1989年 | 106篇 |
1988年 | 110篇 |
1987年 | 65篇 |
1986年 | 76篇 |
1985年 | 86篇 |
1984年 | 109篇 |
1983年 | 87篇 |
1982年 | 111篇 |
1981年 | 97篇 |
1980年 | 84篇 |
1979年 | 62篇 |
1978年 | 73篇 |
1977年 | 74篇 |
1976年 | 59篇 |
1975年 | 64篇 |
1974年 | 59篇 |
1973年 | 67篇 |
1970年 | 41篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
A time-resolved fluorescence study of ethidium bromide (EB) in the presence of poly(dG-dC) and of poly(dG-dC) modified by chlorodiethylenetriamine platinum(II) chloride is presented under solvent conditions in which these polymers adopt the Z-conformation (high ionic strength). It is shown that these polynucleotides can intercalate a very small quantity of EB. The binding parameters have been determined. The fluorescence lifetime of EB is slightly higher when bound to the Z-conformation (?25 ns) than when bound to the B-conformation (?23.7 ns). The nature of the salt has been checked. In the presence of 2.5M NaClO4, no transition from the Z-conformation to another conformation is observed when EB is added. On the contrary, in the presence of 4.25M NaCl, EB induces a cooperative transition from the Z-conformation to a conformation characterized by a much higher affinity for EB intercalation. In the case of poly(dG-dC) this last conformation is identical to the one observed at low ionic strength (B-conformation), but in the case of the platinated polymer this conformation is slightly different, as judged by the smaller value of the fluorescence lifetime of the intercalated EB. 相似文献
82.
Rémy L''Heureux Trevor Dennis Olivier Curet Bernard Scatton 《Journal of neurochemistry》1986,46(6):1794-1801
The release of endogenous noradrenaline was measured in the cerebral cortex of the halothane-anesthetized rat by using the technique of brain dialysis coupled to a radioenzymatic assay. A thin dialysis tube was inserted transversally in the cerebral cortex (transcortical dialysis) and perfused with Ringer medium (2 microliter min-1). Under basal conditions, the cortical output of noradrenaline was stable over a period of at least 6 h and amounted to 8.7 pg/20 min (not corrected for recovery). Histological control of the perfused area revealed very little damage and normal morphology in the vicinity of the dialysis tube. Omission of calcium from the perfusion medium caused a marked drop in cortical noradrenaline output. Bilateral electrical stimulation (for 10 min) of the ascending noradrenergic pathways in the medial forebrain bundle caused a frequency-dependent increase in cortical noradrenaline output over the range 5-20 Hz. Stimulation at a higher frequency (50 Hz) resulted in a levelling off of the increase in cortical noradrenaline release. Systemic administration of the dopamine-beta-hydroxylase inhibitor bis-(4-methyl-1-homopiperazinylthiocarbonyl) disulfide (FLA 63) (25 mg/kg i.p.) markedly reduced, whereas injection of the monoamine oxidase inhibitor pargyline (75 mg/kg i.p.) resulted in a progressive increase in, cortical noradrenaline output. d-Amphetamine (2 mg/kg i.p.) provoked a sharp increase in cortical noradrenaline release (+450% over basal values within 40 min). Desmethylimipramine (10 mg/kg i.p.) produced a twofold increase of cortical noradrenaline release. Finally, idazoxan (20 mg/kg i.p.) and clonidine (0.3 mg/kg i.p.), respectively, increased and decreased the release of noradrenaline from the cerebral cortex.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
83.
Francis Chaouloff Guy A. Kennett Bernard Serrurrier Daniele Merino Gerald Curzon 《Journal of neurochemistry》1986,46(5):1647-1650
Rats were trained to run on a horizontal treadmill for 2 h at 20 m/min. This activity considerably increased plasma free tryptophan (TRP) (+70%) but did not alter plasma total TRP levels and had little or no effect on plasma concentrations of the other large neutral amino acids (LNAAs) that compete with TRP for entry into the brain. Brain TRP levels increased by 80%. The only other brain LNAA to be affected by exercise was threonine, which rose moderately. The results indicate that increased plasma free TRP was specifically responsible for the increase of brain TRP after 2 h of exercise. Brain lysine was also increased whereas glycine, alanine, and gamma-aminobutyric acid were decreased. The differences between the present findings and those previously obtained following 2 h immobilization stress are discussed. 相似文献
84.
Terminal associations occur commonly between meiotic homologues of the two smallest (S10, S11) chromosomes in the northern race of Cryptobothrus chrysophorus when they are either heterozygous or homozygous for distal supernumerary heterochromatic segments. A detailed examination of the origin and behaviour of these associations provides convincing evidence that they are non-chiasmate in character and so cannot be explained by either pseudoterminalisation or terminalisation. The same is true of the terminal associations involved in the persistent pseudomultiples that develop between non-homologues of Heteropternis obscurella when one or both of these carry distal heterochromatic segments. In both situations the C-bands involved in such terminal associations are entire and are never interrupted by non-banded material. In Cryptobothrus, similar associations can also develop between centromere regions when these are heterozygous or homozygous for proximal supernumerary heterochromatic segments. 相似文献
85.
M Bernard P Menasche P Canioni E Fontanarava R P Geyer A Piwnica P Cozzone 《Archives internationales de physiologie et de biochimie》1985,93(5):97-105
Using 31P-NMR and haemodynamical measurements, this work assesses different aspects of myocardial preservation improvement during a global ischaemia, based on a simultaneous and correlated study of high-energy phosphorylated compounds, intracellular pH and left ventricular function. Isolated perfused working rat hearts were subjected to 2 or 3 h of hypothermic ischaemia followed by 30 or 45 min of reperfusion. A study of the influence of pH and buffer used in cardioplegic solutions has demonstrated a better preservation of high-energy phosphates and an improved functional recovery when using a pH 7.0, glutamate - containing solution. Protection provided by cardioplegia can be enhanced by the appropriate use of a fluorocarbon-oxygenated cardioplegic reperfusate. The use of nifedipine, a calcium antagonist, in the cardioplegic solutions, does not provide any additional protection under hypothermic conditions. 相似文献
86.
H-2-linked Ir gene control of T cell recognition of the Sm nuclear autoantigen and the aberrant response of autoimmune MRL/Mp-+/+ mice 总被引:3,自引:0,他引:3
N F Bernard R A Eisenberg P L Cohen 《Journal of immunology (Baltimore, Md. : 1950)》1985,134(6):3812-3818
We have examined T cell recognition of the nuclear autoantigen Sm. Rabbit Sm-primed cells from autoimmune MRL/Mp-+/+ (+/+) mice and from all normal strains tested were able to proliferate to rabbit Sm in vitro. In contrast, the reactivity of normal strains to Sm of murine origin was genetically restricted; only H-2f strains B10.M and A.CA, and H-2s strains B10.S and A.SW could recognize mouse Sm, suggesting that responsiveness to mouse Sm was under the control of H-2-linked Ir genes. Although five Iak-bearing normal strains (B10.A, B10.A(2R), B10.BR, A/Sn, and CBA) did not recognize mouse Sm, autoimmune +/+ (Iak) mice were responders. The responsiveness of the +/+ mice to Sm was probably not due to differences in their Iak region, compared with other strains, because the Iak region of normal strains and the autoimmune +/+ strain were indistinguishable by interstrain MLC, immune response gene product function, and recognition by anti-Iak mAb. Inhibition of Sm-induced proliferation by mAb demonstrated that T cells from autoimmune +/+ mice, responder normal strains, and nonresponder normal strains recognized rabbit and mouse Sm in the context of I region-encoded products. The T cell response to Sm antigen in normal mice is therefore Ia region restricted and, for the murine antigen, under Ir gene control. Autoimmune mice that spontaneously make anti-Sm antibodies (+/+) also perceive Sm in an Ia-restricted manner, but their responder status abrogates H-2-linked Ir gene control. 相似文献
87.
Pythium pythioides (Roze & Cornu) Ramsbottom is recorded from Algeria. Since its original discovery in 1869 this species had not been found back. A brief history is given and morphological and reproductive characters are discussed. 相似文献
88.
89.
S. Bernard D. C. Jewell 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1985,70(5):474-483
Summary Maize was crossed with sorghum, Tripsacum and millet with the aim of introgressing desirable alien characteristics into maize. The products of crosses were analyzed as to their level of differentiation following pollination; their further development on artificial culture medium was compared. In spite of a stimulation rate close to 5%, no evidence of hybridization between maize and sorghum or millet could be obtained. The plants recovered proved to be of maternal origin. However, with an appreciable frequency, stimulation leading to hypertrophic growth of nucellar tissue was observed. This phenomenon is bound to pollination, never occurring in non-pollinated ears. In crosses involving Tripsacum, more than 140 true hybrids were isolated. The influence of the genotypes used as well as factors such as climatic conditions or in vitro techniques are discussed. Except for one haploid maize plant, all the plants recovered proved to be classical hybrids, most of them showing the expected complement of chromosomes from each parent (10 + 36 chromosomes), a few others being slightly hyperploid (2n = 47 to 50 chromosomes). No non-classical hybrids constituted by a nonreduced female gamete and a reduced male gamete were obtained. 相似文献
90.
M. Bernard S. Bernard 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1985,70(4):390-399
Summary Two F5 strains of tetraploid triticale (2n= 4x=28), obtained from 6x triticaleX2 rye progenies, were crossed with diploid and tetraploid rye, some durum and bread wheats, and various 8x and 6x triticale lines. Meiosis in the different hybrid combinations was studied. The results showed that the haploid complement of these triticales consists of seven chromosomes from rye and seven chromosomes from wheat. High frequencies of PMCs showing trivalents were observed in hybrids involving the reference genotypes of wheat and triticale. These findings proved that several chromosomes from the wheat component have chromosome segments coming from two parental wheat chromosomes. The origin of these heterogeneous chromosomes probably lies in homoeologous pairing occurring at meiosis in the 6x triticaleX2x rye hybrids from which 4x triticale lines were isolated. A comparison among different hybrids combinations indicated that the involvement of D-genome chromosomes in homoeologous pairing is quite limited. In contrast, meiotic patterns in 4x triticale X 2x rye hybrids showed a quite high pairing frequency between some R chromosomes and their A and B homoeologues. 相似文献