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931.
932.
Lei W Feng XH Deng WB Ni H Zhang ZR Jia B Yang XL Wang TS Liu JL Su RW Liang XH Qi QR Yang ZM 《The Journal of biological chemistry》2012,287(19):15174-15192
Embryo implantation into the maternal uterus is a crucial step for the successful establishment of mammalian pregnancy. Following the attachment of embryo to the uterine luminal epithelium, uterine stromal cells undergo steroid hormone-dependent decidualization, which is characterized by stromal cell proliferation and differentiation. The mechanisms underlying steroid hormone-induced stromal cell proliferation and differentiation during decidualization are still poorly understood. Ribonucleotide reductase, consisting of two subunits (RRM1 and RRM2), is a rate-limiting enzyme in deoxynucleotide production for DNA synthesis and plays an important role in cell proliferation and tumorgenicity. Based on our microarray analysis, Rrm2 expression was significantly higher at implantation sites compared with interimplantation sites in mouse uterus. However, the expression, regulation, and function of RRM2 in mouse uterus during embryo implantation and decidualization are still unknown. Here we show that although both RRM1 and RRM2 expression are markedly induced in mouse uterine stromal cells undergoing decidualization, only RRM2 is regulated by progesterone, a key regulator of decidualization. Further studies showed that the induction of progesterone on RRM2 expression in stromal cells is mediated by the AKT/c-MYC pathway. RRM2 can also be induced by replication stress and DNA damage during decidualization through the ATR/ATM-CHK1-E2F1 pathway. The weight of implantation sites and deciduoma was effectively reduced by specific inhibitors for RRM2. The expression of decidual/trophoblast prolactin-related protein (Dtprp), a reliable marker for decidualization in mice, was significantly reduced in deciduoma and steroid-induced decidual cells after HU treatment. Therefore, RRM2 may be an important effector of progesterone signaling to induce cell proliferation and decidualization in mouse uterus. 相似文献
933.
Kong X Li X Cai Z Yang N Liu Y Shu J Pan L Zuo P 《Cellular and molecular neurobiology》2008,28(4):569-579
(1) Neurogenesis driven by neural stem cells (NSCs) is regulated by physiological and pathological factors. Melatonin (MT)
has profound neurotrophic and neuroprotective effects. Hence, we studied the role of MT in regulating the viability and differentiation
of NSCs derived from rat ventral midbrain. (2) NSCs were isolated from the rat ventral midbrain. The viability of NSCs was
determined by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-ulfophenyl)-2H-tetrazolium assay. The differentiation
of NSCs was examined by analyzing the expression of the neural markers, MT receptors, brain derived neurotropic factor (BDNF)
and glial cell line-derived neurotrophic factor (GDNF) with semi-quantitative RT-PCR, immunofluorescence cytochemistry, and
Western blot. (3) Our results showed that MT could promote the viability of NSCs. In addition, MT could significantly elevate
the mRNA and protein levels of tyroxine hydroxylase (TH), a marker of dopaminergic neurons, and decrease the expression of
the astrocytes maker glial fibrillary acidic protein (GFAP). MT also increased the production of BDNF and GDNF in the cultured
NSCs. Meanwhile, we first found that two subtypes of MT receptors, MT1 and MT2, were expressed in the ventral midbrain NSCs.
(4) These results demonstrated that MT could induce NSCs to differentiate into dopaminergic neurons and decrease astrocyte
production. These findings also suggest that MT could offer a beneficial tool in guiding directional differentiation of NSCs. 相似文献
934.
935.
J. Wang K. D. Liu C. G. Xu X. H. Li Q. Zhang 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1998,97(3):407-412
Wide-compatibility varieties (WCVs) are a special class of rice germplasm that is able to produce fertile hybrids when crossed
to both indica and japonica rice varieties. WCVs may differ greatly in their spectrum and level of compatibility. The objective
of this study was to determine the genetic basis of wide-compatibility conferred by ‘Dular’, a landrace variety from India
that has demonstrated a high level of wide-compatibility in previous studies with a broad range of indica and japonica varieties.
A three-way cross (‘Balilla/Dular//Nanjing 11’) was made and the resulting F1 population evaluated in the field for spikelet fertility. A total of 235 plants from this population was assayed individually
for restriction fragment length polymorphisms (RFLPs) at 159 marker loci covering the entire rice genome at regular intervals.
Quantitative trait locus (QTL) analysis identified 5 loci, located on chromosomes 1, 3, 5, 6 and 8, as having significant
effects on hybrid fertility, which jointly explained 55.5% of the fertility variation in this population. The QTL on chromosome
5 ( f5) showed the largest effect on hybrid fertility, followed by those on chromosomes 6 ( f6), 3 ( f3) and 1 ( f1), with the one on chromosome 8 ( f8) having the smallest effect. Genotypes each composed of an allele from ‘Dular’ and an allele from ‘Nanjing 11’ at four ( f3, f5, f6 and f8) of the five QTLs contributed to the increase of fertility in the population. In contrast, the genotype composed of alleles
from ‘Balilla’ and ‘Nanjing 11’ at the fifth locus ( f1) was in the direction of increasing fertility. Analysis of variance using marker genotypes at the five QTLs as the groups
detected two interactions involving four of the five loci, a 2-locus interaction between f5 and f8 and a 3-locus interaction among f3, f5 and f6. The level of hybrid fertility is the result of complex interactions among these loci. The implication of the present findings
in the utilization of the wide-compatibility of ‘Dular’ in rice breeding programs is also discussed.
Received: 21 October 1997 / Accepted: 30 December 1997 相似文献
936.
Zhongyin Yang Chen Li Chao Yan Jianfang Li Min Yan Bingya Liu Zhenggang Zhu Yingli Wu Qinlong Gu 《生物化学与生物物理学报:疾病的分子基础》2019,1865(1):181-192
The kinesin family member 14 (KIF14) is a potential oncogene and is involved in the metastasis of various cancers. Nevertheless, its function in gastric cancer (GC) remains poorly defined. The expression of KIF14 was examined in GC cell lines and a clinical cohort of GC specimens by qPCR, western blotting and immunohistochemistry (IHC) staining. The relationship between KIF14 expression and the clinicopathological features was analyzed. The effect of KIF14 on cell proliferation, colony formation, invasion and migration were investigated in vitro and in vivo. The expression of KIF14 was significantly increased in the GC tissues and cell lines. High KIF14 expression was associated with tumor stage, tumor-node-metastasis (TNM) stage and metastasis. KIF14 was an independent prognostic factor for the overall survival of GC, and a higher expression of KIF14 predicted a poorer survival. KIF14 silencing resulted in attenuated proliferation, invasion and migration in human gastric cancer cells, whereas KIF14 ectopic expression facilitated these biological abilities. Notably, the depressed expression of KIF14 inhibited Akt phosphorylation, while overexpressed KIF14 augmented Akt phosphorylation. Additionally, there was a significant correlation between the expression of KIF14 and p?Akt in GC tissues. Importantly, the proliferation, invasion and migration of the GC cells, which was promoted by KIF14 overexpression, was abolished by the Akt inhibitor MK-2206, while Akt overexpression greatly rescued the effects induced by KIF14 knockdown. Our findings are the first to demonstrate that KIF14 is overexpressed in GC, is correlated with poor prognosis and plays a crucial role in the progression and metastasis of GC. 相似文献
937.
丁香酚对致热家兔弓状核及PO/AH区脑组织中PGE2和cAMP含量的影响 总被引:3,自引:0,他引:3
丁香酚是中药丁香油中的主要作用成份,它具有多种复杂的药理作用,尤其在解热降温方面有显著作用.本研究室以往的电生理实验观察到,丁香酚可反转致热原作用下的PO/AH(视前区-下丘脑前部)温度敏感神经元的放电活动,说明丁香酚的解热作用是通过直接或间接地影响PO/AH神经元的放电活动而实现的.近年来,弓状核在体温调节方面的作用倍受观注.本研究室多年的研究表明,弓状核积极地参与了体温调节活动,因为毁损弓状核后大鼠体温发生明显紊乱.本实验对PO/AH与弓状核在体温调节中的作用进行比较性研究,同时观察家兔发热以及丁香酚解热时在家兔弓状核及PO/AH中PGE2和cAMP含量的变化. 相似文献
938.
本文系笔者根据多年来物候观察记载资料,阐述本研究工作自1958年以来,从神农架地区先后多次引进药用植物种类127科566种中,初步看出有38科65属88种高山药用植物引种成功,并能获得具有发芽能力的成熟种子。此外,由于有些植物种类适应性的强弱和范围不同,引进本所植物园栽培后,同时看出不同的反应。这对于今后进一步研究工作可以提供依据和参考。 相似文献
939.
940.
转基因小鼠乳腺表达人瘦蛋白的研究 总被引:8,自引:0,他引:8
利用转基因动物乳腺生产药用蛋白质是近年来研究的热点,在这方面已有不少成功的例子,展现出良好的应用前景[1,2].本研究选择人瘦蛋白基因作为目标基因是因为其表达产物瘦蛋白能对人体内脂肪的蓄积和能量消耗进行有效的反馈调控,美国科学家已将用E.coli表达的人瘦蛋白用于人肥胖症的治疗并取得了良好的治疗效果[3],但尚未见到利用转基因动物乳腺表达这种蛋白质的研究报道. 相似文献