全文获取类型
收费全文 | 7365篇 |
免费 | 336篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 111篇 |
妇产科学 | 105篇 |
基础医学 | 844篇 |
口腔科学 | 227篇 |
临床医学 | 514篇 |
内科学 | 1853篇 |
皮肤病学 | 124篇 |
神经病学 | 603篇 |
特种医学 | 343篇 |
外国民族医学 | 1篇 |
外科学 | 1509篇 |
综合类 | 36篇 |
预防医学 | 239篇 |
眼科学 | 125篇 |
药学 | 513篇 |
中国医学 | 10篇 |
肿瘤学 | 534篇 |
出版年
2022年 | 63篇 |
2021年 | 109篇 |
2020年 | 56篇 |
2019年 | 100篇 |
2018年 | 107篇 |
2017年 | 92篇 |
2016年 | 97篇 |
2015年 | 122篇 |
2014年 | 166篇 |
2013年 | 178篇 |
2012年 | 320篇 |
2011年 | 297篇 |
2010年 | 167篇 |
2009年 | 164篇 |
2008年 | 322篇 |
2007年 | 289篇 |
2006年 | 318篇 |
2005年 | 326篇 |
2004年 | 306篇 |
2003年 | 298篇 |
2002年 | 322篇 |
2001年 | 242篇 |
2000年 | 240篇 |
1999年 | 224篇 |
1998年 | 96篇 |
1997年 | 78篇 |
1996年 | 50篇 |
1995年 | 53篇 |
1994年 | 52篇 |
1992年 | 187篇 |
1991年 | 213篇 |
1990年 | 191篇 |
1989年 | 171篇 |
1988年 | 164篇 |
1987年 | 171篇 |
1986年 | 134篇 |
1985年 | 141篇 |
1984年 | 112篇 |
1983年 | 99篇 |
1982年 | 49篇 |
1979年 | 78篇 |
1978年 | 51篇 |
1975年 | 50篇 |
1973年 | 41篇 |
1971年 | 49篇 |
1970年 | 41篇 |
1969年 | 53篇 |
1968年 | 54篇 |
1967年 | 42篇 |
1966年 | 52篇 |
排序方式: 共有7720条查询结果,搜索用时 31 毫秒
31.
We reported double-dissociation between the visual processing of the edges and the surfaces of objects. Patients with lateral occipital damage showed selective impairment in the perception of edges whereas those with medial ventral occipital damage showed selective impairment in the perception of the 3D structure of the surface. Patients with medial ventral occipital damage also exhibited impaired perception of color, which is also a surface property. Those results were consistent with those from neuroimaging studies. Taken together, those studies suggest that objects may be processed in two separate pathways in the ventral occipital cortex: the edges of objects are processed in the lateral pathway and the surface of objects are processed in the medial pathway. Both edges and surfaces play important roles in object recognition, and both types of perception should be evaluated in patients with visual agnosia. 相似文献
32.
Relevance of inflammatory cell infiltrates for complete atrioventricular block in experimental murine myocarditis. 总被引:2,自引:0,他引:2
BACKGROUND: There are few systemic pathologic studies on myocarditis. This study aimed to clarify the pathologic characteristics of murine myocarditis. METHODS: We recorded serial electrocardiograms in experimental viral myocarditis in mice and then examined their cardiac pathology. After taking baseline electrocardiograms, we inoculated the mice intraperitoneally with the encephalomyocarditis virus. Electrocardiograms were serially recorded until 220 days after the virus inoculation. RESULTS: Serial electrocardiograms revealed ectopic beats, low voltage of the QRS complex, and the appearance of complete atrioventricular (AV) block. Corresponding myocardial lesions were found in the hearts of mice with these ectopic beats. Mononuclear cell infiltrations into the His bundle were most frequently found in mice with complete AV block. CONCLUSIONS: Inflammatory change with cellular infiltrations was the most common pathologic finding in mice with complete AV block. In clinical settings, anti-inflammatory therapy might be recommended for patients with myocarditis complicated with conduction disturbances. 相似文献
33.
Atsushi Takai Yoshihiro Okabe Nobuhiro Aoki Mariko Takada Shuji Yamamoto Naoya Kimoto Mikio Fujita Akihiko Okada Chiharu Kawanami Yukinobu Takimoto Akio Orino 《Nihon Shokakibyo Gakkai zasshi》2007,104(10):1498-1503
A 77-year-old man, who underwent segmental pancreatectomy for intraductal papillary mucinous adenoma in 2001, was referred to our hospital with complaints of hematemesis and melena on January, 2004. Emergency upper gastrointestinal endoscopy showed a pulsating submucosal protrusion in the duodenal bulb, which was identified as a gastroduodenal arterial aneurysm measuring 1.5cm on abdominal CT imaging. Transcatheter arterial embolization of the aneurysm with metallic coils was successfully performed. Periodically repeated endoscopic examination has revealed the coils protruding into the duodenal lumen without any serious complication. 相似文献
34.
A 61 year-old right-handed man, a president of a company fell downstairs and was found unconscious on January 1, 1985. He was admitted to a hospital and he had been unresponsive for 10 days. As he recovered from the consciousness disturbance, he complained of difficulties in discrimination of common objects and in recognition of familiar faces. The patient was admitted to our hospital for the closer examination on July 29, 1985. There was no abnormality in the general physical examination on admission. Neurological examinations revealed no significant deficits except visual field disturbance. In the results of WAIS, the verbal IQ was 108, but the performance IQ was unmeasurable because of a presence of object agnosia. His spontaneous speech was fluent without paraphasia, perseveration or dysprosody. His auditory comprehension of spoken language and repetition were spared. Neuropsychological examinations revealed an impairment in the recent verbal memory, alexia, agraphia, object agnosia, color naming difficulty, prosopagnosia and visuospatial constructional disability. The patient exhibited three major neuropsychological characteristics. Firstly, the recognition of the objects which were presented by the photograph or line drawing was more severely impaired than the real objects. Secondly, the object naming difficulty was more pronounced in the presentation at an unusual angle than in the free presentation. Thirdly, the patient made poor performance in reproduction of the models by photographic presentation as compared with the presentation of the real models in the three-dimensional block construction test. The CT scan performed on January 4, 1985 demonstrated subcortical hematomas with surrounding edema in the temporo-occipital regions of both hemispheres.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
35.
T Nishiura K Suzuki T Kawaguchi H Nakao N Kawamura M Taniguchi Y Kanayama T Yonezawa S Iizuka N Taniguchi 《Cancer letters》1992,62(3):211-215
We measured the serum levels of manganese-superoxide dismutase (Mn-SOD) in acute myeloid leukemia (AML) and acute lymphoid leukemia (ALL). Serum Mn-SOD level for normal subjects was 94.1 +/- 23.5 ng/ml (mean +/- S.D.), the levels for AML and ALL patients were 159.6 +/- 77.1 ng/ml and 154.4 +/- 77.0 ng/ml, respectively. The serum Mn-SOD levels were unrelated to individual intracellular Mn-SOD levels, but correlated well with serum lactate dehydrogenase values. Regression of the leukemia was accompanied by decrease in the serum level of Mn-SOD. Serum Mn-SOD may thus serve as a measure of the activity of the disease. 相似文献
36.
Yasunori Utsunomiya Toshiyuki Imasawa Aya Abe Keita Hirano Tetsuya Kawamura Ryuji Nagasawa Tetsuya Mitarai Naoki Maruyama Osamu Sakai 《Clinical and experimental nephrology》1997,1(2):83-91
Background The purpose of this study was to examine the effects of bacterial suporantigens, which can derange the immune response and
contribute to the renal lesions of immunoglobulin A (lgA) nephropathy.
Methods Twenty-five micrograms of a bacterial superantigen, staphylococcal enterotoxin B (SEB), was injected into IgA nephropathy-prone
ddY mice intrathymically when they reached 6 weeks of age. Evaluation included measurement of albumin excretion in urine,
immunoglobulin concentration, and lymphokine production in vitro, as well as analysis of T-cell receptor expression in splenic
T-cell subsets and examination of renal histology by light and fluorescence microscopy.
Results At 40 weeks of age, the serum level of IgA in these mice was substantially increased and the number of Vβ8+ CD4+splenic T-cells was significantly decreased compared with measurements in untreated controls. Both control and SEB-treated
mice excreted less than 30 μg/mL of urinary albumin. In mice given SEB, the amount of interleukin 2 (IL-2) and tumor necrosis
factor-α (T helper 1 [Th1]-type cytokines) produced by the in vitro-stimulated lymphocytes significantly decreased. whereas
that of interleukin 4 (IL-4) and interleukin 6 (IL-6) (Th2-type cytokines) markedly increased compared with measurements in
control mice. At 40 weeks of age, mice given SEB showed marked glomerular hypercellularity and enhanced glomerular C3 deposition
by renal histology, compared with control mice.
Conclusion These results suggest that bacterial superantigen SEB may modify glomerular lesions through activating Th2 cells, while inducing
deletion of Th1 cells in this experimental model. 相似文献
37.
Haruo Ito Zengo Kataumi Shigeyuki Yanagi Kenji Kawamura Hidenori Sumiya Hideki Fuse Jun Shimazaki 《International journal of andrology》1986,9(3):161-169
Testicular development was studied in prepubertal boys with retractile testes. Testicular volume, the diameter of the seminiferous tubules and the number of spermatogonia in the tubules were decreased in cases of unilateral retractile testis, when compared with values for the contralateral normally descended testis. On the other hand, in patients with a unilateral retractile testis and contralateral inguinal testis, there was no difference in the developmental parameters between the two testes. These results suggest that the retractile testis has developmental failures characteristic of a cryptorchid testis and therefore requires orchiopexy. 相似文献
38.
S Kawamura Y Sakata Y Chiba Y Yoshida T Kanazawa S Kawazu M Tsuge K Tanabe H Nara M Aizawa 《The Japanese journal of antibiotics》1986,39(5):1250-1258
Clinical evaluation of cefmenoxime (CMX, Bestcall) was performed against infections associated with hematological, respiratory tract and other disorders. Clinical effectiveness of CMX against severe infections with hematological disorders including sepsis, pneumonia, pyelitis and so on was 74.4% for good responses and against the respiratory tract infections, 96.2% for good responses was obtained. Neither objective or subjective side effects nor extreme abnormalities in laboratory tests were observed in these patients. It can be concluded, therefore, that CMX is one of the most useful drugs against infectious diseases associated with hematological disorders, respiratory tract and other disorders. 相似文献
39.
Analyses of T-cell differentiation from hemopoietic stem cells in the G0 phase by an in vitro method. 总被引:1,自引:0,他引:1 下载免费PDF全文
J Toki T Kumamoto H Ogata M Kawamura M Fukumoto Cherry Y Yamamoto S Than M Inaba Y Himeno et al. 《Proceedings of the National Academy of Sciences of the United States of America》1991,88(17):7548-7551
Using differential radiation sensitivity of components of mouse embryonal thymus, an in vitro method for studying T-cell differentiation from hemopoietic stem cells (HSCs) in the G0 phase was established. Intrathymic T-cell precursors present in embryonal thymus were found to be quite radioresistant (up to 20 Gy), and consequently 25-Gy-irradiated embryonal thymic lobes were used. Thymic lobes (25-Gy irradiated) taken from mouse fetuses (gestation day 15) were placed in Millipore-HA culture plates supported on squares of gelatin foam sponge in 24-well culture plates in which neonatal thymus stromal cells were cultured. HSCs (10(5) cells per well) in the G0 phase were added to these thymic lobes and cocultured at 37 degrees C in a 5% CO2/95% air incubator. Half the culture medium was changed every week. After 3 weeks, a large number of colonies had formed. Immunohistochemical studies and fluorescence-activated cell sorter analyses revealed that the colonizing cells regularly develop and exhibit surface markers characteristic of T cells (Thy-1, IL-2R, L3T4, Lyt-2, etc.). In situ hybridization analyses revealed that mRNA expression for T-cell receptor (TCR) beta chains occurred within colonizing cells. Using a monoclonal antibody (F23.1), expression of TCR beta-chain variable domain (V beta 8) on the surface of these developing T cells was demonstrated. These cells responded to interleukin 2 and/or anti-CD3 monoclonal antibody, indicating functional T cells. This method will be useful in studying T-cell differentiation pathways from pluripotent HSCs and in clarifying the mechanisms involved in negative and positive selection of T cells within the thymus. 相似文献
40.