全文获取类型
收费全文 | 11001篇 |
免费 | 615篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 89篇 |
儿科学 | 210篇 |
妇产科学 | 83篇 |
基础医学 | 1276篇 |
口腔科学 | 313篇 |
临床医学 | 841篇 |
内科学 | 3126篇 |
皮肤病学 | 108篇 |
神经病学 | 757篇 |
特种医学 | 587篇 |
外科学 | 1768篇 |
综合类 | 60篇 |
预防医学 | 265篇 |
眼科学 | 133篇 |
药学 | 595篇 |
中国医学 | 31篇 |
肿瘤学 | 1491篇 |
出版年
2023年 | 161篇 |
2022年 | 284篇 |
2021年 | 482篇 |
2020年 | 245篇 |
2019年 | 301篇 |
2018年 | 400篇 |
2017年 | 262篇 |
2016年 | 295篇 |
2015年 | 271篇 |
2014年 | 392篇 |
2013年 | 425篇 |
2012年 | 718篇 |
2011年 | 764篇 |
2010年 | 431篇 |
2009年 | 357篇 |
2008年 | 615篇 |
2007年 | 618篇 |
2006年 | 574篇 |
2005年 | 556篇 |
2004年 | 543篇 |
2003年 | 527篇 |
2002年 | 466篇 |
2001年 | 171篇 |
2000年 | 176篇 |
1999年 | 151篇 |
1998年 | 134篇 |
1997年 | 117篇 |
1996年 | 108篇 |
1995年 | 63篇 |
1994年 | 59篇 |
1993年 | 68篇 |
1992年 | 94篇 |
1991年 | 86篇 |
1990年 | 97篇 |
1989年 | 78篇 |
1988年 | 60篇 |
1987年 | 68篇 |
1986年 | 53篇 |
1985年 | 42篇 |
1984年 | 47篇 |
1983年 | 29篇 |
1979年 | 27篇 |
1978年 | 20篇 |
1977年 | 19篇 |
1976年 | 23篇 |
1974年 | 21篇 |
1972年 | 26篇 |
1969年 | 20篇 |
1968年 | 25篇 |
1967年 | 19篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Sasaki A Kai S Endo Y Iwaki K Uchida H Shibata K Ohta M Kitano S 《Annals of surgical oncology》2007,14(11):3181-3187
Background Although extrahepatic metastasis occurs rarely after hepatic resection for hepatocellular carcinoma (HCC), the prognosis of
these patients is extremely poor. Predictors of extrahepatic metastasis have not been fully investigated.
Methods To identify predictors of extrahepatic metastasis after resection, we retrospectively investigated 77 patients with HCC tumors
>50 mm in diameter who underwent hepatic resection. We investigated correlations between postoperative extrahepatic metastasis
and clinicopathologic factors as well as extrahepatic metastasis-free survival rate by log rank test and predictors of extrahepatic
metastasis by univariate and multivariate logistic regression models.
Results Hepatitis B surface antigen (HBs-Ag) was found in 25 (32.5%) of 77 patients, and extrahepatic metastasis occurred in 26 (33.8%).
Patients with extrahepatic metastasis showed better liver function and a high occurrence of HBs-Ag positivity than those without.
The 5-year extrahepatic metastasis-free survival rate was worse in patients with HBs-Ag positivity, larger tumors (≥70 mm),
higher alfa-fetoprotein level (≥300 ng/mL), and lower indocyanine green retention rate at 15 minutes (ICGR15) (<15%) than in those without. By univariate logistic regression analysis, HBs-Ag positivity, larger HCC tumor (≥70 mm),
lower ICGR15 (<15%), and lower preoperative lymphocyte count (<1000/mm3) were predictors of extrahepatic metastasis (P < .1). By multivariate analysis, HBs-Ag positivity was an independent predictor of postoperative extrahepatic metastasis
(P = .04).
Conclusions In patients positive for HBs-Ag, radiologic examination of extrahepatic organs should be performed as a part of the postoperative
surveillance. Hepatitis B virus infection may promote establishment of extrahepatic metastasis. 相似文献
72.
Mai Kikumoto Shuichiro Neshige Takeo Shishido Hiroki Ueno Shiro Aoki Koji Iida Hirofumi Maruyama 《Internal medicine (Tokyo, Japan)》2022,61(8):1237
We evaluated a 39-year-old pregnant woman with right temporal lobe epilepsy. During the second trimester, seizure deterioration was responsive to an increased daily dose of levetiracetam (LEV). However, immediately after delivery, new non-habitual seizures emerged along with a sharply increased LEV concentration. The frequency of habitual seizures also slightly increased. The non-habitual seizures completely disappeared, and the frequency of the habitual seizures improved to the baseline level after the LEV dosage was reduced. Thus, a paradoxical effect of an increased LEV blood concentration was assumed to be a potential cause of these events. Peripartum pharmacokinetic fluctuations in LEV levels should be monitored carefully. 相似文献
73.
Hideto Kajitani Hiroki Nishiwaki Toshiharu Ueno Fumihiko Koiwa Shigeki Iwasaki Satoshi Hirade 《Internal medicine (Tokyo, Japan)》2022,61(8):1201
A 64-year-old Japanese man who worked at a butcher shop was hospitalized for a fever, headache, and deafness. We diagnosed him with sepsis and meningitis caused by Streptococcus suis infection. The patient''s renal function declined rapidly, and hemodialysis was performed temporarily. A renal biopsy was performed, and the renal function tended to improve with antimicrobial therapy. This case seemed rather similar to one of staphylococcal-associated nephritis in that it showed mesangial proliferative nephritis with immunoglobulin A deposition, even though the nephritis was caused by streptococci. Similarly, intramembranous electron-dense deposits were characteristic findings. We present new findings of an in vivo renal biopsy in a case of S. suis-associated glomerulonephritis. 相似文献
74.
75.
Maeda N Osuga K Higashihara H Tomoda K Mikami K Nakazawa T Nakamura H Tomiyama N 《Cardiovascular and interventional radiology》2012,35(1):82-89
Purpose
The purpose of this retrospective study was to investigate the efficacy of transarterial chemoembolization (TACE) using cisplatin as a second-line treatment for advanced hepatocellular carcinoma (HCC) unresponsive to TACE using epirubicin–Lipiodol emulsion at our institution. 相似文献76.
Perioperative Oral Administration of Cystine and Theanine Enhances Recovery After Distal Gastrectomy
Tomohiro Miyachi MD Takashi Tsuchiya MD PhD Atsushi Oyama MD PhD Takahiro Tsuchiya MD Naomi Abe RD Atsuko Sato RD Yasumasa Chiba MSc Shigekazu Kurihara PhD Tetsuro Shibakusa PhD Takashi Mikami BVSc 《JPEN. Journal of parenteral and enteral nutrition》2013,37(3):384-391
Background: It has been reported that cystine and theanine, amino acids related to glutathione synthesis, have immunomodulatory effects, such as suppressing inflammation after strenuous exercise. In this study, we examined the effects of oral administration of cystine and theanine during the perioperative period as a pilot study. Methods: Forty‐three cases of distal gastrectomy for cancer conducted in our department were assigned to the cystine and theanine group (CT group) or to the placebo control group (P group), and a randomized, single‐blind, parallel‐group study was then performed. Cystine (700 mg) and theanine (280 mg) or a placebo was administered to participants for 10 continuous days (4 days before to 5 days after surgery). Changes in pre‐ and postoperative interleukin (IL)–6, C‐reactive protein (CRP), albumin, white blood cell (WBC) count, neutrophil count, total lymphocyte count, resting energy expenditure (REE), and body temperature were compared and examined. Results: Ten patients were excluded, leaving 33 patients in the study. The CT group had significantly lower IL‐6 values (postoperative day [POD] 4), CRP levels (POD 7), neutrophil counts (POD 4), and body temperatures (POD 5) than the P group (P < .05). In addition, REE in the P group peaked on day 1 (1.14 ± 0.16 [pre‐ and postoperative ratio]), whereas the CT group did not show any increase on POD 1 (0.99 ± 0.21, P < .05 vs P group). Conclusions: This study suggests that oral administration of cystine and theanine during the perioperative period may alleviate postgastrectomy inflammation and promote recovery after surgery. 相似文献
77.
Demetrius M. Kokkinakis S. Clifford Schold Jr. Hiroki Hori Tsutomu Nobori 《Nutrition and cancer》2013,65(3):195-204
Depletion of plasma methionine is expected to inhibit or reverse growth of methionine‐dependent tumors; however, modulation of methionine and other sulfur amino acids is not a trivial task in experimental animals. l‐Methioninase from Pseudomonas putida at 1,000 U/kg causes acute reduction of plasma methionine by 80% in mice, but recovery occurs within 14 hours. Restriction of dietary choline and replacement of dietary methionine with homocystine results in 50% chronic reduction of plasma methionine. A >70% reduction can be accomplished with a diet deficient in methionine, homocystine, and choline, but ultimately this diet is lethal. Plasma methionine can be lowered to a steady state of <5 μM in mice with a combination of dietary restriction of methionine, homocysteine, and choline and synchronous treatments with intraperitoneal injections of 1,000 U/kg L‐methioninase and 25–50 mg/kg homocystine, each administered at 12‐hour intervals. Modulation of plasma methionine by this means causes no weight loss or pathologies in liver or pancreas, and it does not markedly alter levels of cysteine, homocysteine, or glutathione in plasma or in hepatic tissue. When this procedure is applied to athymic mice bearing human medulloblastoma (Daoy) tumors subcutaneously, tumor growth is inhibited. Methionine deprivation arrests mitosis by blocking the cell cycle in G2 and induces apoptosis. Tumor stasis was achieved in 100% of treated animals within 4 days of treatment, and regression was seen in one‐third of animals after a 10‐day period. These data strongly support the use of methionine‐depleting regimens for tumor treatments. 相似文献
78.
Yuriko Watanabe Agnes Shiel D. Lindsay McLellan Masaki Kurihara Kentaro Hayashi 《Disability and rehabilitation》2013,35(9):370-378
Purpose: To ascertain the views of families living with TBI patients about the nature of the problems experienced as a result of TBI, and to compare the views of Japanese family members (J-FM) and British family members (B-FM) in order to find out whether there were cultural differences in family response to TBI. Methods: Family members involved in providing care were identified by the patients. Face to face interviews were conducted with all 18 carers in B-FM and four carers in J-FM. The remaining eight carers in J-FM participated in the postal questionnaire. Questionnaires were developed to explore the nature of problems and the involvement of family such as social embarrassment. Results: Problems arising in families were almost the same reported from both groups. However families in B-FM were likely to know more about how to cope with these problems. Family members in J-FM reported more statistically significant increases in social embarrassment than those in B-FM. Conclusion: The preliminary results showed that family members living with TBI patients in both groups had experienced problems. Appropriate rehabilitation services should be developed to help families as well as TBI patients in Japan. 相似文献
79.
80.
Nobuaki Miyazono M.D. Hiroki Inoue Akira Hori Ichiroh Kanetsuki Jurio Shimada Masayuki Nakajo 《Cardiovascular and interventional radiology》1994,17(1):36-37
We present a 44-year-old woman in whom a bronchialto-coronary artery communication via the conus branch was discovered after distal bronchial artery embolization with gelatin sponge for hemoptysis. If this bronchial-to-coronary artery anastomosis, not visible prior to embolization, had been inadvertently embolized, the patient could have developed a myocardial infarction. To reduce the likelihood of a serious complication, the possibility of this anastomosis should be kept in mind and angiography should be repeated before attempting proximal bronchial artery embolization. 相似文献