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991.
992.
993.
Kobayashi K Ishii S Kume K Takahashi T Shimizu T Manabe T 《The European journal of neuroscience》1999,11(4):1313-1316
From pharmacological studies, platelet-activating factor (PAF) has been proposed as a retrograde messenger for long-term potentiation (LTP) in the hippocampal CA1 region. We re-examined a possible contribution of PAF to LTP with a more specific approach using mice deficient in the PAF receptor. The PAF receptor-deficient mice exhibited normal LTP and showed no obvious abnormality in excitatory synaptic transmission. We also performed pharmacological experiments on the wild-type mice. Two structurally different antagonists of PAF receptors had no effects on LTP. Furthermore, the application of PAF itself caused no detectable changes in excitatory synaptic transmission. Thus, we conclude that the PAF receptor is not required for LTP in the CA1 region. Introduction 相似文献
994.
Association Study of Parathyroid Hormone Gene Polymorphism and Bone Mineral Density in Japanese Postmenopausal Women 总被引:16,自引:1,他引:15
Hosoi T Miyao M Inoue S Hoshino S Shiraki M Orimo H Ouchi Y 《Calcified tissue international》1999,64(3):205-208
Association of BST B1 restriction fragment length polymorphism (RFLP) of the parathyroid hormone (PTH) gene with bone mineral density (BMD)
was examined in 383 healthy postmenopausal women in Japan who were unrelated. The RFLP was represented as B or b, the capital
letter signifying the presence of and the small letter the absence of restriction site for BST B1. The frequency of each genotype—BB, Bb, and bb—was 82.5%, 16.7%, and 0.8%, respectively. When we statistically compared
age, years after menopause, body height, and body weight between the BB genotype and the Bb genotype groups, there was no
significant difference between the groups. However, the lumbar BMD and the score of BMD adjusted for age and body weight (Z
score) were significantly lower in the group of genotype Bb than in the BB: 0.859 ± 0.019 g/cm2 versus 0.925 ± 0.011 (mean ± SE, P= 0.01) and −0.412 ± 0.138 versus 0.067 ± 0.082 (mean ± SE, P= 0.01). In addition, the Z score of total body BMD in the Bb genotype group was lower than that in the BB group. Comparison
of serum and urinary biochemical bone metabolic markers suggested that the subjects with Bb genotype might be in a relatively
higher state of bone turnover than those with BB genotype. These results suggest that the polymorphism in the PTH gene would
be a useful genetic marker for lower BMD and the susceptibility for osteoporosis.
Received: 19 March 1998 / Accepted: 24 June 1998 相似文献
995.
Screening for mutations in candidate genes for hypospadias 总被引:2,自引:0,他引:2
Nordenskjöld A Friedman E Tapper-Persson M Söderhäll C Leviav A Svensson J Anvret M 《Urological research》1999,27(1):49-55
Hypospadias, a condition with a frontally placed urethral orifice on the penis, is the most common malformation in males.
During fetal development several components are necessary for normal male genital development. Testosterone and dihydrotestosterone
act via the androgen receptor but a defective receptor function results in different degrees of genital malformations. Testosterone-5α-reductase
converts testosterone to dihydrotestosterone, which is crucial for normal differentiation, and a total lack of this enzyme
results, in syndromes with hypospadias. The Wilms' tumour 1 (WT1) gene is expressed in the fetal gonad and genital malformations
can occur due to WT1 gene mutations. These genes are therefore strong candidate genes for hypospadias. We have analysed 35
boys with hypopadias and one girl diagnosed as with complete androgen insensitivity syndrome, using exon by exon polymerace
chain reaction (PCR) amplification of the AR, WT1 and 5α-reductase genes and screened for point mutations and performed subsequent
DNA sequencing. No mutations in any of these genes were found in the 26 patients with isolated hypospadias. Two patients with
severe hypospadias with cryptorchidism were found to carry mutations in the androgen receptor gene. Also the girl with clinically
diagnosed complete androgen insensitivity was found to be homozygous for a splice mutation in the 5α-reductase gene. In summary,
mutations in the WT1, AR and 5α-reductase genes are not common causes of isolated hypospadias.
Received: 1 October 1997 / Accepted: 4 May 1998 相似文献
996.
目的: 研究1,25-二羟维生素D3 对结肠癌细胞系Caco-2 细胞中报告基因表达的作用,并探讨在报告载体pGL2 序列中存在潜在的抑制性维生素D应答元件(VDRE)的可能性。方法: 采用磷酸钙沉淀法将报告载体转染入Caco-2 细胞。Caco-2细胞经不同浓度1,25-二羟维生素D3 处理后测定细胞裂解液中表达的荧光素酶活性。结果: 应用pGL2 报告载体时,当用pSG5-VDR表达载体共转染后,1,25-二羟维生素D3显著地抑制Caco-2 细胞荧光素酶的表达(P< 0.05);而未使用该表达载体共转染则无抑制作用(P> 0.05)。应用pGL3 报告载体时,不同浓度的1,25-二羟维生素D3 对pLG3转染后Caco-2 细胞表达的荧光素酶活性均无显著抑制作用(P> 0.05),该作用不依赖是否存在有pSG5-VDR表达载体共转染。结论:1,25-二羟维生素D3 对报告载体PGL2 荧光素酶表达具有抑制作用,而对pGL3 则否;类似人类PTH基因中的潜在抑制性VDRE存在于报告载体pGL2,在pGL3 中该VDRE业已改变。 相似文献
997.
998.
免疫状态对Fv—4基因抗Friend MuLV作用的影响 总被引:1,自引:0,他引:1
通过检测免疫抑制的F1小鼠和杂合子F2裸鼠对Friend小鼠白血病病毒(Fr.MuLV)感染的敏感性,探讨免疫状态对Fv-4基因(特别是对Fv-4基因杂合子)抗FriendMuLV作用的影响,经腹腔接种Fr.MuLV病毒液攻击小鼠或F2裸鼠后,检查其计中Fr.MuLV的增主其发病情况,结果表明,免疫抑制的F1小鼠和杂合子F1裸鼠都可被Fr.MuLV脾脏中有病毒增殖,并用约2/3的杂合子F2裸鼠与B 相似文献
999.
氯化甲基汞对大鼠脑神经细胞凋亡及P^53基因表达的影响 总被引:6,自引:0,他引:6
选用Wistar系雄性大鼠,经皮下注射给予10mg/Kg体重氯化甲基汞(CH3HgCl),连续7天,第15天取其脑组织,利用细胞和分子生物学技术进行DNA电泳和流式细胞术(FCM)分析。实验结果,染毒组大鼠脑组织DNA电泳呈现特征性梯形电泳带;FCM分析染毒组大鼠脑神经细胞的凋亡率、P53基因表达率显著高于对照组(P<0.05)。结果表明:CH3HgCl以诱导凋亡方式导致脑神经细胞损伤,P53基因参与CH3HgCl诱导脑神经细胞凋亡的基因调控过程。 相似文献
1000.
目的:为获得与天然鲑鱼生长激素一致的基因工程产物,对已构建的鲑鱼生长激素基因分泌型表达质粒pOsGH153进行改造,删除所编码表达产物氨基端多余的9个碱基,方法:采用PALTER系统进行寡聚核苷酸指导下的基因定点缺失突变。突变质粒pOsGH158经限制性酶切图谱及Southern印迹杂交分析加以证,结果:含有表达质粒pOsGH158的大肠杆菌株经IPTG诱导后提取周质帽白,经SDS-PAGE及免疫 相似文献