全文获取类型
收费全文 | 15068篇 |
免费 | 801篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 128篇 |
儿科学 | 292篇 |
妇产科学 | 464篇 |
基础医学 | 1811篇 |
口腔科学 | 516篇 |
临床医学 | 1221篇 |
内科学 | 4328篇 |
皮肤病学 | 376篇 |
神经病学 | 1340篇 |
特种医学 | 306篇 |
外科学 | 2187篇 |
综合类 | 96篇 |
一般理论 | 2篇 |
预防医学 | 1089篇 |
眼科学 | 211篇 |
药学 | 795篇 |
中国医学 | 69篇 |
肿瘤学 | 707篇 |
出版年
2024年 | 10篇 |
2023年 | 152篇 |
2022年 | 369篇 |
2021年 | 632篇 |
2020年 | 327篇 |
2019年 | 518篇 |
2018年 | 676篇 |
2017年 | 393篇 |
2016年 | 408篇 |
2015年 | 460篇 |
2014年 | 700篇 |
2013年 | 818篇 |
2012年 | 1285篇 |
2011年 | 1305篇 |
2010年 | 661篇 |
2009年 | 587篇 |
2008年 | 1004篇 |
2007年 | 922篇 |
2006年 | 893篇 |
2005年 | 865篇 |
2004年 | 758篇 |
2003年 | 598篇 |
2002年 | 599篇 |
2001年 | 68篇 |
2000年 | 69篇 |
1999年 | 84篇 |
1998年 | 92篇 |
1997年 | 64篇 |
1996年 | 70篇 |
1995年 | 60篇 |
1994年 | 46篇 |
1993年 | 37篇 |
1992年 | 39篇 |
1991年 | 28篇 |
1990年 | 25篇 |
1989年 | 20篇 |
1988年 | 19篇 |
1987年 | 11篇 |
1986年 | 24篇 |
1985年 | 19篇 |
1984年 | 22篇 |
1983年 | 17篇 |
1982年 | 23篇 |
1981年 | 20篇 |
1980年 | 22篇 |
1979年 | 9篇 |
1978年 | 12篇 |
1974年 | 11篇 |
1973年 | 19篇 |
1972年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
The role of glutamate in conditioned taste aversion was investigated. Both, in the amygdala (AMYG) and in the lateral hypothalamus (LH) extracellular levels of glutamate were assessed by microdialysis and capillary electrophoresis with laser induced fluorescence detection. Rats were conditioned by pairing a novel flavor (strawberry flavor) with an intraperitoneal injection of lithium chloride. When the conditioned stimulus (strawberry flavored solution) was injected into the mouth of conditioned rats, there was an increase of glutamate release in the AMYG, and a decrease in glutamate release in the LH. These results predicted that glutamate release in the AMYG and the LH was involved in CTA. This possibility was tested by MK-801 (glutamate antagonist) and glutamate microinjections. MK-801 injections in AMYG attenuated the rejection of the novel flavor, and in the LH did not cause any effect on CTA. Glutamate microinjections in the AMYG caused CTA. These results suggest that glutamatergic activity in the AMYG might be a relevant neurochemical correlate and cause of conditioned taste aversion. 相似文献
52.
PURPOSE: To assess the dose-dependent effect of low concentrations of isoflurane on respiratory mechanics in normal subjects. METHODS: We studied 12 non-premedicated ASA I patients scheduled for lower abdominal or extremity surgery. After thiopental 5-7 mg*kg(-1) iv and succinylcholine 1 mg x kg(-1) iv, the trachea was intubated and an esophageal balloon was placed optimally by the occlusion test. After introduction of N(2)O and muscle paralysis with vecuronium, we studied 0, 0.6, 0.9 and 1.2% isoflurane. We recorded flow (F), airway opening and esophageal pressures. Signals were amplified, filtered, sampled at 100 Hz, and then fed in a 12-bit analogue-digital converter in a personal computer. Data were collected and analyzed using LABDAT and ANADAT software. Signals were acquired for 60-90 sec during mechanical ventilation (10 mL x kg(-1), 10 breaths x min(-1), I:E ratio 1:2). We estimated respiratory system (RS), lung (L) and chest wall (W) dynamic elastance (E) and resistance (R) by P(t) = EV(T)(t) + RF(t) + K, where t is time, V(T) tidal volume from integration of F, and K an estimation of end-expiratory pressure. ANOVA was used for comparing the basal state with the three concentrations. RESULTS: E and R were statistically lower at 0.6, 0.9 and 1.2% compared to basal values for RS, L and W. Concentrations equal to or higher than 0.6% did not further change respiratory mechanics, except for E(L1.2) compared to E(L0.6,) 12.37 +/- 5.72 and 13.52 +/- 5.64 cm H(2)O.L(-1), respectively. CONCLUSION: Isoflurane concentrations between 0.6-1.2% are not associated to a dose-dependent effect on respiratory mechanics. 相似文献
53.
Dr. Pedro J. Morgado M.D. José A. Suárez M.D. Luis G. Gómez M.D. Pedro J. Morgado Jr. M.D. 《Diseases of the colon and rectum》1988,31(6):474-480
The present classification of first, second, and third grade hemorrhoids only reflects variation in size of a normal human tissue and does not relate to "hemorrhoidal disease." Cross-sections and coronal sections of the anal canal in 32 fetuses, with ages ranging from 28 to 38 weeks of development, were studied and the following fundamental facts were found: in the lumen of the anal canals of fetuses, there are prominences of mucosa formed by conjunctive and muscular tissue, arterial and venous vessels and glands, arranged without following any particular pattern, which resemble similar formations found in the adult that protrude equally in the inside of the canal, known as hemorrhoids. The muscular tissue, smooth or striated, is grouped in bundles, and bunches of collagen fibers of homogeneous, nonfragmented, and regular aspect are found between them. Blood vessels have an ample lumen with a defined structure of collagen tissue as well as muscular tissue in its walls. Prominences of mucosa are connected to the remainder of the intestinal wall by defined conjunctive thick, nonfragmented fibers, that permit firm adherence. In healthy adults, the findings were similar but there was an evident degenerative process in the collagen fibers. In 100 surgical specimens of hemorrhoidectomies, the histologic investigation demonstrated a severe inflammatory reaction that especially affected the blood vessel wall and conjunctive tissue, which probably produced an ischemic lesion of the mucosa that could condition the onset of a vascular thrombosis, allowing displacement of the mucosa and its protrusion through the anus. The files of 815 patients suffering from hemorrhoidal disease were also studied. The main physical findings were bleeding, thrombosis of the internal hemorrhoidal plexus, prolapse of the anal cushions, or a combination of these. The authors propose to classify hemorrhoidal disease as bleeding, prolapsing, thrombotic, and mixed hemorrhoidal disease, aiming toward a rational treatment. 相似文献
54.
Busse A Sánchez MA Monterroso V Alvarado MV León P 《American journal of medical genetics. Part A》2004,(2):190-194
Four affected siblings in a Costa Rican family presented an aggressive polyneuropathy with widespread involvement of many visceral organs and onset during the third decade of life with rapid loss of muscle mass in the lower limbs and severe dysautonomy. The medical histories include vitreous opacity, cardiac enlargement, dermal and gastrointestinal infiltration, and autonomic dysfunction including circulatory compromise and gastrointestinal disturbances. Histological studies using Congo red stain and immunohistochemical assays with antibodies against the transthyretin (TTR) protein showed widespread deposition of amyloid in extracellular areas, including dermis and gastrointestinal lamina propia, endo- and perineural spaces, and vascular walls. A mutation search in the transthyretin (ttr) gene was performed seeking the cause of this severe form of familial amyloidotic polyneuropathy (FAP). We applied single-stranded conformational polymorphism (SSCP)-analyses followed by sequencing of the four exons of the ttr gene, revealing a point mutation in exon 3, a G to A transition that causes a Glu54Lys codon change. Western blots of plasma proteins incubated with anti-transthyretin antibodies after gel electrophoresis provided separation of wild-type and mutant TTR protein in affected family members. 相似文献
55.
PTOV-1, a novel protein overexpressed in prostate cancer,shuttles between the cytoplasm and the nucleus and promotes entry into the S phase of the cell division cycle 下载免费PDF全文
Santamaría A Fernández PL Farré X Benedit P Reventós J Morote J Paciucci R Thomson TM 《The American journal of pathology》2003,162(3):897-905
PTOV1 was recently identified as a novel gene and protein during a differential display screening for genes overexpressed in prostate cancer. The PTOV1 protein consists of two novel protein domains arranged in tandem, without significant similarities to known protein motifs. By immunohistochemical analysis, we have found that PTOV1 is overexpressed in 71% of 38 prostate carcinomas and in 80% of samples with prostate intraepithelial neoplasia. High levels of PTOV1 in tumors correlated significantly with proliferative index, as assessed by Ki67 immunoreactivity, and associated with a nuclear localization of the protein, suggesting a functional relationship between PTOV1 overexpression, proliferative status, and nuclear localization. In quiescent cultured prostate tumor cells, PTOV1 localized to the cytoplasm, being excluded from nuclei. After serum stimulation, PTOV1 partially translocated to the nucleus at the beginning of the S phase. At the end of mitosis, PTOV1 exited the nucleus. Transient transfection of chimeric green fluorescent protein-PTOV1 forced the entry of cells into the S phase of the cell cycle, as shown by double fluorescent imaging for green fluorescent protein and for Ki67, and also by flow cytometry. This was accompanied by greatly increased levels of cyclin D1 protein in the transfected cells. These observations suggest that overexpression of PTOV1 can contribute to the proliferative status of prostate tumor cells and thus to their biological behavior. 相似文献
56.
Jacobus H. Schuurmans Stekhoven Jr Inés Isabel Silva Pedro San Román 《Parasitology research》1957,17(6):490-509
Ohne ZusammenfassungMit 2 Textabbildungen 相似文献
57.
Paul Kruszka Tommy Hu Sungkook Hong Rebecca Signer Benjamin Cogné Betrand Isidor Sarah E. Mazzola Jacques C. Giltay Koen L. I. van Gassen Eleina M. England Lynn Pais Charlotte W. Ockeloen Pedro A. Sanchez‐Lara Esther Kinning Darius J. Adams Kayla Treat Wilfredo Torres‐Martinez Maria F. Bedeschi Maria Iascone Stephanie Blaney Oliver Bell Tiong Y. Tan Marie‐Ange Delrue Julie Jurgens Brenda J. Barry Elizabeth C. Engle Sarah K. Savage Nicole Fleischer Julian A. Martinez‐Agosto Kym Boycott Elaine H. Zackai Maximilian Muenke 《American journal of medical genetics. Part A》2019,179(10):2075-2082
Zinc finger protein 462 (ZNF462) is a relatively newly discovered vertebrate specific protein with known critical roles in embryonic development in animal models. Two case reports and a case series study have described the phenotype of 10 individuals with ZNF462 loss of function variants. Herein, we present 14 new individuals with loss of function variants to the previous studies to delineate the syndrome of loss of function in ZNF462. Collectively, these 24 individuals present with recurring phenotypes that define a multiple congenital anomaly syndrome. Most have some form of developmental delay (79%) and a minority has autism spectrum disorder (33%). Characteristic facial features include ptosis (83%), down slanting palpebral fissures (58%), exaggerated Cupid's bow/wide philtrum (54%), and arched eyebrows (50%). Metopic ridging or craniosynostosis was found in a third of study participants and feeding problems in half. Other phenotype characteristics include dysgenesis of the corpus callosum in 25% of individuals, hypotonia in half, and structural heart defects in 21%. Using facial analysis technology, a computer algorithm applying deep learning was able to accurately differentiate individuals with ZNF462 loss of function variants from individuals with Noonan syndrome and healthy controls. In summary, we describe a multiple congenital anomaly syndrome associated with haploinsufficiency of ZNF462 that has distinct clinical characteristics and facial features. 相似文献
58.
59.
60.
Moyle GJ DeJesus E Cahn P Castillo SA Zhao H Gordon DN Craig C Scott TR;Ziagen Once-Daily in Antiretroviral Combination Therapy 《Journal of acquired immune deficiency syndromes (1999)》2005,38(4):417-425
The long intracellular half-life of abacavir (ABC) supports its once-daily use, and this would be expected to simplify treatment if ABC could be given as part of a complete once-daily regimen. A randomized double-blind clinical trial compared the efficacy and safety of 600 mg of ABC administered once daily (n = 384) versus 300 mg of ABC administered twice daily (n = 386) in combination with 300 mg of lamivudine (3TC) and 600 mg of efavirenz (EFV) administered once daily in antiretroviral-naive patients over 48 weeks. The baseline median plasma HIV-1 RNA level was 4.89 log10 copies/mL (44% with viral load >100,000 copies/mL), and the median CD4 cell count was 262 cells/mm. ABC administered once daily was non-inferior to the twice-daily regimen, with 66% and 68% of patients in these respective treatment arms achieving a confirmed plasma HIV-1 RNA level <50 copies/mL (95% confidence interval: -8.4%, 4.9%). The ABC once-daily and twice-daily regimens were similar with respect to infrequency of virologic failure (10% vs. 8%), emergence of resistance mutations, CD4 cell increases from baseline (median, 188 vs. 200 cells/mm), safety profile, and incidence of ABC-related hypersensitivity reactions (9% vs. 7%). ABC administered once daily in combination with 3TC and EFV administered once daily was non-inferior to the ABC twice-daily dosing schedule when combined with 3TC and EFV over 48 weeks. 相似文献