全文获取类型
收费全文 | 6301篇 |
免费 | 290篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 54篇 |
儿科学 | 93篇 |
妇产科学 | 21篇 |
基础医学 | 813篇 |
口腔科学 | 162篇 |
临床医学 | 336篇 |
内科学 | 1669篇 |
皮肤病学 | 155篇 |
神经病学 | 314篇 |
特种医学 | 277篇 |
外科学 | 1064篇 |
综合类 | 30篇 |
预防医学 | 241篇 |
眼科学 | 85篇 |
药学 | 427篇 |
中国医学 | 36篇 |
肿瘤学 | 883篇 |
出版年
2023年 | 37篇 |
2022年 | 78篇 |
2021年 | 144篇 |
2020年 | 82篇 |
2019年 | 124篇 |
2018年 | 111篇 |
2017年 | 124篇 |
2016年 | 155篇 |
2015年 | 150篇 |
2014年 | 188篇 |
2013年 | 256篇 |
2012年 | 403篇 |
2011年 | 412篇 |
2010年 | 247篇 |
2009年 | 228篇 |
2008年 | 375篇 |
2007年 | 437篇 |
2006年 | 440篇 |
2005年 | 461篇 |
2004年 | 441篇 |
2003年 | 431篇 |
2002年 | 412篇 |
2001年 | 73篇 |
2000年 | 62篇 |
1999年 | 90篇 |
1998年 | 97篇 |
1997年 | 77篇 |
1996年 | 90篇 |
1995年 | 55篇 |
1994年 | 40篇 |
1993年 | 42篇 |
1992年 | 33篇 |
1991年 | 23篇 |
1990年 | 27篇 |
1989年 | 37篇 |
1988年 | 26篇 |
1987年 | 13篇 |
1986年 | 15篇 |
1985年 | 14篇 |
1984年 | 20篇 |
1983年 | 9篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1975年 | 8篇 |
1968年 | 4篇 |
排序方式: 共有6660条查询结果,搜索用时 15 毫秒
101.
Morinaga S Yamamoto Y Noguchi Y Imada T Rino Y Akaike M Sugimasa Y Takemiya S Takanashi Y 《Hepato-gastroenterology》2003,50(53):1521-1526
BACKGROUND/AIMS: Platelet-derived endothelial cell growth factor (PD-ECGF) is one of the angiogenic factors. The aim of this study was to examine the PD-ECGF concentrations in hepatocellular carcinoma, background liver, and normal liver tissues, and to elucidate their significance on clinicopathological outcomes. METHODOLOGY: The concentration of PD-ECGF in the tissue extract was determined by enzyme-linked immunosorbent assay. RESULTS: PD-ECGF concentrations were significantly higher in hepatocellular carcinoma and background liver tissues compared with normal control liver (p = 0.003, p = 0.001, respectively). PD-ECGF concentrations in hepatocellular carcinoma tissues were positively correlated with intratumoral arteriole densities (r = 0.667, p = 0.009), and were higher in less differentiated carcinomas (p = 0.039). However, tumor PD-ECGF concentration did not affect the patients' disease-free survival rates. Those in the background liver tissues were positively correlated with histological activity index scores (r = 0.650, p = 0.001) and serum alanine aminotransferase levels (r = 0.0452, p = 0.035). CONCLUSIONS: PD-ECGF is up-regulated in hepatocellular carcinoma and the corresponding hepatitis liver. The PD-ECGF concentrations in hepatocellular carcinoma correlated positively with microvessel density, lower differentiation, yet not with patients' prognosis. The concentrations of PD-ECGF in the corresponding hepatitis liver correlated positively with the degree of active hepatitis. 相似文献
102.
A 51-year-old woman presented with flexion contractures of the legs. Physical examination showed decreased passive movements of the bilateral hip and knee joints without muscle spasms or neurological abnormalities. Laboratory evaluation showed no response of ACTH or plasma cortisol to stimulation with CRH or insulin. Diagnosis of isolated adrenocorticotropic hormone deficiency was made. The patient was started on prednisolone 5 mg daily, and flexion contractures of the legs rapidly disappeared. Although the musculoskeletal manifestation of this patient is similar to that of stiff-person syndrome, flexion contracture of the legs associated with adrenocortical insufficiency seems to be a separate disease entity from stiff-person syndrome. 相似文献
103.
OBJECTIVES: This study evaluated the significance of perfusion defects demonstrated by thallium-201 and age in the prognosis of patients with idiopathic dilated cardiomyopathy. METHODS: Seventy-four dilated cardiomyopathy patients underwent thallium scintigraphy as well as clinical and hemodynamic examination. RESULTS: Abnormal perfusion defects were present in 23 of 38 patients aged < 60 years (61%) and in 26 of 36 elderly patients aged > or = 60 years (72%; NS). Univariate analysis showed that such perfusion defects were a significant predictor of cardiac death only in patients aged < 60 years (p = 0.015). Stepwise discriminant analysis also revealed that perfusion defects were a significant predictor in patients aged < 60 years (Wilks' lambda 0.499, chi-square test 20.2, p = 0.003). Perfusion defects were not more important than the history of syncope or stroke in elderly dilated cardiomyopathy patients. Twenty-one patients died of disease-related causes during 58 +/- 43 months. The five-year survival rate was better in patients aged < 60 years without than in those with perfusion defects (100% vs 58.4%, respectively), but not affected in patients aged > or = 60 years (66.7% vs 62.2%). CONCLUSIONS: Thallium scintigraphy is valuable for the prognosis of patients with dilated cardiomyopathy aged < 60 years who are usually candidates for heart transplantation. Absence of thallium perfusion defects may indicate good long-term prognosis. 相似文献
104.
Tanaka Y Takakura Y Taniguchi A Sugimoto K Kumai T Fukui A 《Modern rheumatology / the Japan Rheumatism Association》2004,14(2):130-134
Partial intertarsal joint arthrodesis was performed on 12 feet of 11 patients as a surgical treatment for planovalgus deformity of the foot and lesions of the intertarsal joints caused by rheumatoid arthritis. Single arthrodesis was performed on the talocalcaneal joint in eight feet, two of which underwent simultaneous total ankle arthroplasty, and on the talonavicular joint in two feet. Double arthrodesis was done on the talocalcaneal and talonavicular joints in one foot and on the talonavicular and calcaneocuboid joints in one foot. Screws or staples were used for fixation. Patients were followed for 2 years to 8 years 7 months (average 4 years 3 months). Osseous fusion was achieved in all feet, and satisfactory pain relief was obtained in all cases except one. We performed this surgery in patients who were relatively active, and the results indicated that arthrodesis of a small number of joints that caused pain and deformity was effective in reducing pain and correcting the deformity. We concluded that partial tarsal arthrodesis should be performed on a limited number of joints during the early stages of planovalgus deformity of the foot because more joints are found to be fixed during the advanced stages. However, progression of the osteoarthritis was found in the neighboring joints. Close follow-up observation is needed. 相似文献
105.
Four types of Ipsilateral Breast Tumor Recurrence (IBTR) after breast‐conserving surgery: Classification of IBTR based on precise pathological examination 下载免费PDF全文
Takehiko Sakai Seiichiro Nishimura Akiko Ogiya Masahiko Tanabe Kiyomi Kimura Hidetomo Morizono Kotaro Iijima Yumi Miyagi Masujiro Makita Yoshinori Ito Masahiko Oguchi Rie Horii Futoshi Akiyama Takuji Iwase 《Pathology international》2015,65(3):113-118
We classified ipsilateral breast tumor recurrences (IBTRs) based on strict pathological rules. Ninety‐six women who were surgically treated for IBTR were included. IBTRs were classified according to their origins and were distinguished based on strict pathological rules: relationship between the IBTR and the primary lumpectomy scar, surgical margin status of the primary cancer, and the presence of in situ lesions of IBTR. The prognosis of these subgroups were compared to that of new primary tumors (NP) in the narrow sense (NPn) that occurred far from the scar. Distant‐disease free survival of IBTR that occurred close to the scar with in situ lesions and a negative surgical margin of the primary cancer (NP occurred close to the scar, NPcs) was similar to that of NPn. In contrast, IBTR that occurred close to the scar without in situ lesions (true recurrence (TR) that arose from residual invasive carcinoma foci, TRinv) had significantly poorer prognosis than NPn. IBTR that occurred close to the scar with in situ lesions and a positive surgical margin of the primary cancer (TR arising from a residual in situ lesion, TRis) had more late recurrences than NPcs. Precise pathological examinations indicated four distinct IBTR subtypes with different characteristics. 相似文献
106.
Yoshinori Hashimoto Ayano Ikeda Yusuke Tokuyasu Hiromi Omura Takayuki Tanaka 《Journal of infection and chemotherapy》2018,24(12):983-986
Although hematopoietic stem cell transplantation (HSCT) may increase the curability of refractory hematologic diseases, it requires complication management due to a long-term immunocompromised state. We experienced a case who received an autologous peripheral blood stem cell transplantation (Auto-PBSCT) for POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy, and skin changes) and developed cutaneous Mycobacterium chelonae infection. It is clear that attention needs to be paid to prevent bacterial, fungal and viral infection after HSCT. It is also important to keep in mind that tuberculous and nontuberculous mycobacteria (NTM), in rare cases, lead to lethal complications. 相似文献
107.
108.
Kohki Nakamura MD PhD Takehito Sasaki MD Yutaka Take MD PhD Kentaro Minami MD Mitsuho Inoue MD Chisa Asahina MD Wataru Sasaki MD Shohei Kishi MD Shingo Yoshimura MD Yoshinori Okazaki MD Hiroyuki Motoda MD PhD Katsura Niijima MD PhD Yuko Miki MD PhD Koji Goto MD PhD Kenichi Kaseno MD PhD Eiji Yamashita MD PhD Keiko Koyama MD PhD Nobusada Funabashi MD PhD Shigeto Naito MD PhD 《Journal of cardiovascular electrophysiology》2021,32(1):16-26
109.
Sahara N Ihara M Ono T Tamashima S Matsui H Takeshita A Ohno R 《American journal of hematology》2000,64(4):311-313
A 70-year-old woman presented with monoclonal gammopathy, pancytopenia, and renal insufficiency, which were initially refractory to combination chemotherapy by VMMD (vincristine, ranimustine, melphalan, and dexamethasone) and MP (melphalan and prednisolone) regimens. The myeloma cells, which consisted of 73% of bone marrow nucleated cells, expressed CD38(+), CD19(+), CD56(-), CD45(-), CD49e(-), and MPC-1(+) phenotypes by flow cytometric analysis and showed the rearranged immunoglobulin heavy chain (IgH) gene by Southern blotting. By immunostaining, the myeloma cells were positive for cytoplasmic immunoglobulin light chain kappa. These results suggest that myeloma cells can express CD19(+)CD56(-), the phenotype considered to be expressed on only normal plasma cells. 相似文献
110.
Background We developed and evaluated the clinical usefulness of a scoring system that subclassified type Vi pit patterns.
Methods We studied 119 colon cancer lesions (pTis, n = 26; pT1, n = 93) and 22 tubular adenoma lesions with severe atypia in which a type Vi pit pattern was visible under a stereomicroscope. Four type Vi pit pattern formation appearances (existing pits, marginal irregularities of the gland duct, narrowing of the gland duct
lumen, and unclear outline of the gland duct) were defined, and the relationship between each appearance and the invasive
depth of the cancer was evaluated.
Results When the four type Vi pit pattern appearances were considered in a logistic regression analysis, the odds of a more invasive submucosal cancer
were significantly increased by the appearance of marginal irregularities, a narrowed lumen, and an unclear outline. In the
logistic regression analysis results, when 0.63 was used as the cutoff score for prediction of a more invasive submucosal
cancer, 80 cases in the less invasive group were classified correctly (specificity, 1.0), whereas 53 (86.9%) of the 61 cases
in the more invasive group were classified correctly (sensitivity, 0.869).
Conclusions It is important first to understand the usability and limitations of objective scoring of type V pit pattern findings and
then to apply this score to the determination of cancer depth in order to accurately identify lesions suitable for endoscopic
treatment. 相似文献