全文获取类型
收费全文 | 3434篇 |
免费 | 183篇 |
国内免费 | 18篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 112篇 |
妇产科学 | 38篇 |
基础医学 | 298篇 |
口腔科学 | 109篇 |
临床医学 | 274篇 |
内科学 | 840篇 |
皮肤病学 | 46篇 |
神经病学 | 170篇 |
特种医学 | 158篇 |
外国民族医学 | 1篇 |
外科学 | 687篇 |
综合类 | 80篇 |
一般理论 | 1篇 |
预防医学 | 281篇 |
眼科学 | 85篇 |
药学 | 230篇 |
中国医学 | 16篇 |
肿瘤学 | 185篇 |
出版年
2023年 | 31篇 |
2022年 | 59篇 |
2021年 | 117篇 |
2020年 | 60篇 |
2019年 | 85篇 |
2018年 | 111篇 |
2017年 | 67篇 |
2016年 | 72篇 |
2015年 | 61篇 |
2014年 | 136篇 |
2013年 | 166篇 |
2012年 | 198篇 |
2011年 | 264篇 |
2010年 | 151篇 |
2009年 | 144篇 |
2008年 | 182篇 |
2007年 | 186篇 |
2006年 | 187篇 |
2005年 | 181篇 |
2004年 | 150篇 |
2003年 | 157篇 |
2002年 | 152篇 |
2001年 | 71篇 |
2000年 | 75篇 |
1999年 | 51篇 |
1998年 | 23篇 |
1997年 | 10篇 |
1996年 | 19篇 |
1995年 | 18篇 |
1994年 | 17篇 |
1993年 | 14篇 |
1992年 | 33篇 |
1991年 | 37篇 |
1990年 | 36篇 |
1989年 | 28篇 |
1988年 | 31篇 |
1987年 | 35篇 |
1986年 | 26篇 |
1985年 | 27篇 |
1984年 | 14篇 |
1983年 | 10篇 |
1981年 | 8篇 |
1979年 | 15篇 |
1978年 | 13篇 |
1973年 | 11篇 |
1970年 | 9篇 |
1969年 | 13篇 |
1968年 | 8篇 |
1967年 | 7篇 |
1966年 | 9篇 |
排序方式: 共有3635条查询结果,搜索用时 15 毫秒
101.
Raghu Ram EV Kumar A Biswas S Kumar A Chaubey S Siddiqi MI Habib S 《Molecular and biochemical parasitology》2007,154(1):30-39
The DNA replication machinery of the Plasmodium falciparum apicoplast is a validated drug target. Nuclear-encoded gyrase subunits are predicted to play a critical role in maintaining DNA topology during the D-loop/bi-directional ori replication process of the parasite. We show the presence of P. falciparum gyrase subunits in parasite lysates by using antibodies generated against recombinant gyrase A and B. The ATPase activity of PfGyrB was inhibited by novobiocin that also caused parasite death in culture. Reduction of apicoplast/nuclear DNA ratio in the presence of novobiocin indicated that the drug targets apicoplast DNA replication. Molecular modeling of gyrase A and B subunits revealed extensive fold conservation with the Escherichia coli counterparts as well as the presence of a long disordered loop adjacent to the ATPase domain of PfGyrB. Our results have implications for development of PfGyrB as a drug target against malaria. 相似文献
102.
Mousli M Turki I Kharmachi H Saadi M Dellagi K 《Journal of virological methods》2007,146(1-2):246-256
The purpose of this study was to design a novel in vitro tool by using recombinant protein technology to qualify the whole reagent preparation procedure, to be used to quantify rabies viral antigen preparation in a simple and rapid format for potency control of rabies vaccines. 50AD1 is a neutralizing monoclonal antibody directed against the rabies virus glycoprotein that binds to native conformational antigenic site III. In the present study, the DNA fragments encoding the variable domains of 50AD1 were inserted into a prokaryotic expression vector so as to produce a single-chain Fv antibody fragment (scFv) genetically fused to the bacterial alkaline phosphatase (AP). The recombinant fusion protein preserved both the AP enzymatic activity and the antigen-binding activity against the rabies virus glycoprotein nearly identical to the parental antibody, and was used successfully in different assays including ELISA, dot-blot and cell culture tests. The present study shows that the genetic fusion protein provides a new tool for one-step rabies virus immunodetection, which can be produced in homogeneous bifunctional reagent, easily, quickly and reproducibly. In addition, this recombinant immunoconjugate is a promising alternative reagent for applications involving immunodetection, it presents a similar sensitivity and specificity to that obtained with classical reagents. 相似文献
103.
Sabrina Iuglio Habib Chaudhury Susan E. Slaughter Christina Lengyel Jill Morrison 《Journal of nutrition in gerontology and geriatrics》2018,37(2):82-104
Long-term care (LTC) physical and psychosocial mealtime environments have been inconsistently assessed due to the lack of a standardized measure. The purpose of this study was to examine the construct validity of a new standardized observational measure, the Mealtime Scan (MTS), using the Making Most of Mealtimes data collected on 639 residents in 82 dining rooms in 32 LTC homes. The MTS includes physical, social, and person-centered care summary scales scored from 1 to 8. Mean ratings on these summary scales were moderate for physical (5.6 SD 0.9), social (5.0 SD 0.9), and person-centered care (PCC; 5.5 SD 0.8). Regression analyses determined which items within the MTS were associated with these summary scales: physical – music (B?=?0.27, p?=?0.04), number of staff passing food (B?=??0.11, p?=?0.03), number of residents (B?=??0.03, p?=?0.01); social – social sound (B?= 0.31 p?0.0001), number of residents requiring eating assistance (B?=?0.11, p?=?0.02); PCC – lighting (B?=?0.01 p?=?0.04), and total excess noise (B?=?0.05, p?0.0001). The Mealtime Relational Care Checklist (M-RCC) was associated positively with ratings on all three summary scales. Correlations revealed that the MTS summary scales were associated with other constructs: Dining Environment Audit Protocol functionality scale, resident and dining room level M-RCC, Mini Nutritional Assessment- Short Form, and resident Cognitive Performance Scale. These results demonstrate that the MTS summary scales exhibit construct validity, as the ratings were associated with expected observed mealtime characteristics and correlated with dining room and resident level constructs in anticipated directions. 相似文献
104.
105.
106.
J. K. Jewer M. J. Wong S. J. Bird A. S. Habib R. Parker R. B. George 《Anaesthesia》2020,75(2):254-265
We conducted a Cochrane systematic review on the effectiveness of supplemental intravenous crystalloid administration in preventing postoperative nausea and vomiting. We included randomised controlled trials of patients undergoing surgery under general anaesthesia and given supplemental peri-operative intravenous crystalloid. Our primary outcomes were the risk of postoperative nausea and the risk of postoperative vomiting. We assessed the risk of bias for each included study and applied the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) framework for the certainty of evidence. We included 41 studies. We found that the intervention probably reduces the overall risk of postoperative nausea, the risk ratio (95%CI) being 0.62 (0.51–0.75) (I2 = 57%, p < 0.00001, 18 studies; 1766 participants; moderate-certainty evidence). It also probably reduces the risk of postoperative nausea within 6 h of surgery, with a risk ratio (95%CI) of 0.67 (0.58 to 0.78) (I2 = 9%, p < 0.00001, 20 studies; 2310 participants; moderate-certainty evidence) and by around 24 h, the risk ratio (95%CI) being 0.47 (0.32–0.69) (I2 = 38%, p = 0.0001, 17 studies; 1682 participants; moderate-certainty evidence). Supplemental intravenous crystalloid probably also reduces the overall risk of postoperative vomiting, with a risk ratio (95%CI) of 0.50 (0.40–0.63) (I2 = 31%, p < 0.00001, 20 studies; 1970 participants; moderate-certainty evidence). The beneficial effect on vomiting was seen both within 6 h and by around 24 h postoperatively. 相似文献
107.
Hussain A. Isma’eel George E. Sakr Robert H. Habib Mohamad Musbah Almedawar Nathalie K. Zgheib Imad H. Elhajj 《European journal of clinical pharmacology》2014,70(3):265-273
Background
The unpredictability of acenocoumarol dose needed to achieve target blood thinning level remains a challenge. We aimed to apply and compare a pharmacogenetic least-squares model (LSM) and artificial neural network (ANN) models for predictions of acenocoumarol dosing.Methods
LSM and ANN models were used to analyze previously collected data on 174 participants (mean age: 67.45 SD 13.49 years) on acenocoumarol maintenance therapy. The models were based on demographics, lifestyle habits, concomitant diseases, medication intake, target INR, and genotyping results for CYP2C9 and VKORC1. LSM versus ANN performance comparisons were done by two methods: by randomly splitting the data as 50 % derivation and 50 % validation cohort followed by a bootstrap of 200 iterations, and by a 10-fold leave-one-out cross-validation technique.Results
The ANN-based pharmacogenetic model provided higher accuracy and larger R value than all other LSM-based models. The accuracy percentage improvement ranged between 5 % and 24 % for the derivation cohort and between 12 % and 25 % for the validation cohort. The increase in R value ranged between 6 % and 31 % for the derivation cohort and between 2 % and 31 % for the validation cohort. ANN increased the percentage of accurately dosed subjects (mean absolute error ≤1 mg/week) by 14.1 %, reduced the percentage of mis-dosed subjects (mean absolute error 2-3 mg/week) by 7.04 %, and reduced the percentage of grossly mis-dosed subjects (mean absolute error ≥4 mg/week) by 24 %.Conclusions
ANN-based pharmacogenetic guidance of acenocoumarol dosing reduces the error in dosing to achieve target INR. These results need to be ascertained in a prospective study. 相似文献108.
Habib MOHAMMADZADEH HAJIPIRLOO Arezoo BOZORGOMD Shahram SHAHABI Khosrow HAZRATI TAPPEH Seyed Ahmad KARAMATI 《Iranian Journal of Parasitology》2014,9(3):311-318
Background
Naltrexone, an opioid receptor antagonist shifts the immune response toward a Th1 profile. In the current study, we evaluated the efficacy of the mixture of NTX and alum, as a new adjuvant, to enhance immune response and induce protection against Leishmania major in a mouse model.Methods
BALB/c mice were immunized three times either autoclaved L. major promastigotes’ antigens alone or in combination with the adjuvant alum, naltrexone or the alum–naltrexone mixture. Both humoral and cellular immune responses were assessed two weeks after the last immunization and compared with control mice.Results
The administration of alum- NTX in combination with the parasite antigen, significantly increased production of IFN-γ IFN-γ /IL-5 ratio, lymphocyte proliferation and improved DTH response against L. major. There was no significant difference in survival following challenge among groups.Conclusion
Immunization with the alum– naltrexone mixture as an adjuvant, in combination with the autoclaved L. major promastigotes antigens, can enhance cellular immunity and shift the immune responses to a Th1 pattern. 相似文献109.
Role of endoscopic ultrasound and cyst fluid tumor markers in diagnosis of pancreatic cystic lesions
Hussein Hassan Okasha Abeer Abdellatef Shaimaa Elkholy Mohamad-Sherif Mogawer Ayman Yosry Magdy Elserafy Eman Medhat Hanaa Khalaf Magdy Fouad Tamer Elbaz Ahmed Ramadan Mervat E Behiry Kerolis Y William Ghada Habib Mona Kaddah Haitham Abdel-Hamid Amr Abou-Elmagd Ahmed Galal Wael A Abbas Ahmed Youssef Altonbary Mahmoud El-Ansary Aml E Abdou Hani Haggag Tarek Ali Abdellah Mohamed A Elfeki Heba Ahmed Faheem Hani M Khattab Mervat El-Ansary Safia Beshir Mohamed El-Nady 《World journal of gastrointestinal endoscopy》2022,14(6):402-415
110.
Mahim Khan Waqar Rauf Fazal-E- Habib Moazur Rahman Mazhar Iqbal 《World journal of hepatology》2022,14(7):1528-1529
Retraction note: Khan M, Rauf W, Habib F, Rahman M, Iqbal M. Screening and identification of bioactive compounds from citrus against non-structural protein 3 protease of hepatitis C virus genotype 3a by fluorescence resonance energy transfer assay and mass spectrometry. World J Hepatol 2020; 12(11): 976-992 PMID: 33312423 DOI: 10.4254/wjh.v12.i11.976. The online version of the original article can be found at https://www.wjgnet.com/1948-5182/full/v12/i11/976.htm. 相似文献