全文获取类型
收费全文 | 1072篇 |
免费 | 46篇 |
国内免费 | 59篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 1篇 |
妇产科学 | 1篇 |
基础医学 | 127篇 |
口腔科学 | 4篇 |
临床医学 | 17篇 |
内科学 | 190篇 |
皮肤病学 | 105篇 |
神经病学 | 35篇 |
特种医学 | 17篇 |
外科学 | 102篇 |
综合类 | 82篇 |
预防医学 | 181篇 |
眼科学 | 2篇 |
药学 | 121篇 |
中国医学 | 166篇 |
肿瘤学 | 25篇 |
出版年
2024年 | 5篇 |
2023年 | 28篇 |
2022年 | 59篇 |
2021年 | 80篇 |
2020年 | 51篇 |
2019年 | 81篇 |
2018年 | 48篇 |
2017年 | 51篇 |
2016年 | 31篇 |
2015年 | 39篇 |
2014年 | 69篇 |
2013年 | 84篇 |
2012年 | 61篇 |
2011年 | 65篇 |
2010年 | 49篇 |
2009年 | 54篇 |
2008年 | 38篇 |
2007年 | 38篇 |
2006年 | 37篇 |
2005年 | 40篇 |
2004年 | 20篇 |
2003年 | 25篇 |
2002年 | 17篇 |
2001年 | 11篇 |
2000年 | 11篇 |
1999年 | 13篇 |
1998年 | 7篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 2篇 |
排序方式: 共有1177条查询结果,搜索用时 15 毫秒
1.
A survey of plants used as wild vegetables was conducted in four districts of Botswana in August and September 2005. The objective was to determine which wild plants were used as vegetables in the study area, and to document their cooking and preservation methods. Fourteen species representing seven families were mentioned as wild vegetables. In addition, six species from four families had other uses in traditional medicine. The implications of the documented processing methods on the retention of nutrients in the vegetables are discussed. 相似文献
2.
Sule Jman Redzic 《Ecology of food and nutrition》2006,45(3):189-232
This article presents first systematical procedure results on traditional usage of wild, edible, vitaminous, and aromatic plants in the nutrition of human population in Bosnia and Herzegovina (W. Balkan peninsula; SE Europe). By method of an ethnobotanical interview, which comprised of over 250 persons, whose average age was 55, and by research on edible wild flora all around Bosnia and Herzegovina that extended over many years, detected were 308 plants belonging to 73 plant families that are being used in nutrition and diet of indigenous population. Edible wild plants are used as delicious vegetables, fruits, peer and spices, in either fresh, raw, or dried condition. Plants are being used for the making of cooked food (33%), fresh salads (19%), mush and bread (17%), or as fresh, wild fruits and drinks (13%) or as spices and ethno-pharmacological potions (10%). The majority of identified, wild edible plants may satisfy the daily human need for elementary nutrition material, particularly those of vitamins C and A, and for some minerals, according to the regulations of World Health Organization (WHO). 相似文献
3.
对甘蓝进行热风和微波真空联合干燥试验,目的是缩短热风干燥时间,提高产品质量.结果表明:联合干燥缩短了干燥时间约48.33%,提高了产品的营养成分保存率、叶绿素保存率;微波真空干燥使产品质构疏松. 相似文献
4.
采用原子吸收分光光度法、高效液相色谱等方法对秦巴山区野生与栽培猪苓菌核的氨基酸、水分、灰分、粗蛋白、粗脂肪、粗纤维、矿质元素、猪苓多糖等主要成分及含量进行测定.结果表明,野生和栽培猪苓在所测定的17种氨基酸中,7种必需氨基酸占氨基酸总量的质量分数分别为33.8%,23.6%.每100g野生与栽培猪苓菌核中水分质量分别为13.22g,11.94g;灰分质量分别为2.86g,2.61g;粗蛋白质量分别为6.87g,4.91g;粗纤维质量分别为27.62g,26.02g;粗脂肪质量分别为1.87g,1.71g;每100g野生和栽培猪苓质量分别为1.87g,1.71g;猪苓多糖质量分别为0.51g,0.40g. 相似文献
5.
ABSTRACT Coronaviruses (CoVs) mainly cause enteric and/or respiratory signs. Mammalian CoVs including COVID-19 (now officially named SARS-CoV-2) belong to either the Alphacoronavirus or Betacoronavirus genera. In birds, the majority of the known CoVs belong to the Gammacoronavirus genus, whilst a small number are classified as Deltacoronaviruses. Gammacoronaviruses continue to be reported in an increasing number of avian species, generally by detection of viral RNA. Apart from infectious bronchitis virus in chickens, the only avian species in which CoV has been definitively associated with disease are the turkey, pheasant and guinea fowl. Whilst there is strong evidence for recombination between gammacoronaviruses of different avian species, and between betacoronaviruses in different mammals, evidence of recombination between coronaviruses of different genera is lacking. Furthermore, the recombination of an alpha or betacoronavirus with a gammacoronavirus is extremely unlikely. For recombination to happen, the two viruses would need to be present in the same cell of the same animal at the same time, a highly unlikely scenario as they cannot replicate in the same host! 相似文献
6.
An outbreak of trichinellosis in farmed wild boar in Finland 总被引:2,自引:0,他引:2
Oivanen L Mikkonen T Sukura A 《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》2000,108(12):814-818
Nine farmed wild boar out of 25 slaughtered from a single farm were condemned at meat inspection because of trichinellosis. With RAPD-PCR, Trichinella spiralis was identified in all positive wild boar. Out of the available serum samples (n=7), all wild boar which had failed the meat inspection showed seroconversion in ELISA and Western blotting, as did one additional animal which had passed the inspection. The animals became infected during an invasion of rats from an improperly closed dump near the farm. Unfortunately, by the time trichinellosis was discovered in the wild boar, the invasion had already been brought under control; thus, no samples from rats were available. However, having lived through the rat invasion was shown to be a risk factor for trichinellosis in wild boar (relative risk, RR=6.3). In wildlife samples from surrounding areas, sylvatic trichinellosis was found to be very common (74%; n= 19 red foxes). Intriguingly, the prevalent species in trichinella-positive foxes differed from that in wild boar, Trichinella nativa and T. spiralis being found in 12 foxes and in one fox, respectively. 相似文献
7.
Nidhi Sharma Atsushi Ohyabu Yoshiki Murakumo Masahide Takahashl Mitsuhiro Saito Hiroyuki Amo Shin-ichiro Murayama Kyoko Ohno Sen-ichi Oda Mutsushi Matsuyama 《Pathology international》1997,47(7):436-441
The thymoma prone BUF/Mna (B) rat is a useful model for Studying the genes responsible for thymus enlargement during the stage of young growth. Among the strains of rats, B rats have the largest thymuses at al stages of life. A locus, Ten-1 , which contributes to thymus enlargement in back-cross (BC) rats between the B and WKY/NCrj (W) strains, was mapped on chromosome 1. To determine the precise location of the bus, (B×(B×MITE)F1) BC rats were generated by crossing the B strain with the Inbred MITE (M) strain, which was established from captured, Japanese wild rats, and were examined by linkage study using polymerase chain reaction with 67 microsatellite markers. Linkages with thymus enlargements were found In genotypes of seven markers, BSIS, LSN, MYL2, IGF2, PBPC2, D1Mgh11 , and D1Mit6 , by X2- test and Student's t -test, which confirmed the presence of the genetic locus associated with thymus enlargement, Ten-1 , in this region. Paradoxically, a suppressive locus, Tsu-1 , to thymus enlargement was also found on chromosome 3, showing linkages of phenotype of the small thymus with genotypes of SCN2A, CAT D3Mit16 , and D3Mit13 . By analyses of mapmaker/exp and mapmaker/qtl, Ten-1 was mapped at 4.6 cM proximal from IGF2 locus on chromosome 1 and Tsu-1 at 4.0 cM proximal from CAT locus on chromosome 3, respectively. 相似文献
8.
Many residues involved in polymorphic antibody-binding epitopes on class II molecules are located on the -helix of DRβ chains. Although they have received less attention, residues in the peptide-binding groove and second domain of the DRβ chain may also be critical for polymorphic anti-DR antibody epitopes. In this study, we used transfectants expressing site-directed mutations at positions in the HLA-DR β1 and β2 domains and flow cytometry to define the epitopes of several polymorphic anti-DR antibodies. Both DR(β 1*0403) residues 14 and 25 were shown to be involved in the epitopes of mAbs DA6. 164, HU-20, Q5/6, and 50D6, and DR(β 1*0701) residue 14 was shown to be critical for the epitopes of two DR7-specific mAbs, SFR16-DR7M and TAL 13. 1. Unlike most other residues shown to be important in antibody-binding epitopes, residue 14 is located in the floor of the peptide-binding groove and residue 25 is in an outer loop, each with their side chains pointing down, such that antibodies may directly contact these residues from below the binding groove. Two residues in the β2 domain, β180 and β181, were also shown to be involved in the epitopes of three polymorphic anti-DR mAbs, NFLD.D1, NFLD.M1, and LY9. Although these two residues are close to the transmembrane domain in the linear sequence, their solvent accessibility in the DR1 structures is quite impressive. Our data provide new evidence that residues accessible under the peptidebinding groove contribute to polymorphic antibody-binding epitopes. 相似文献
9.
Two polymeric autosomal loci, Ten1 and Ten2, regulate thymus enlargement in BUF/Mna (B) rats. Previously, we mapped Ten1 on chromosome (Chr) 1 to a 20 cM region between Myl2 and D1Mgh11, and Ten2 on Chr 13. To further characterize the precise position of Ten1, 34 and 37 microsatellite markers, that have a polymorphism between the B and WYK (W) and between the B and MITE (M) strains, were used for linkage analysis of thymus enlargement in 105 (WBF1 x B) blackcross (BC) and 78 (B x BMF1) BC rats, respectively. Our data showed that the D1Rat168, D1Rat112, D1Rat323, D1Got186, D1Got187 and D1Got188 markers each gave a peak logarithm of odds (LOD) score of 10.68 for linkage to the thymus ratio in (WBF1 x B) BC rats, and that the D1Rat168, D1Rat197, D1Got184, D1Got186 and D1Got188 markers each gave a peak LOD score of 7.82 in (B x BMF1) BC rats. The two LOD score peaks are coincident in the position of the rat genetic map. All of the markers mentioned above are located in the region between Igf2 and D1Mgh11, in which synteny is conserved with human 11q15.5 and the distal end of mouse Chr 7 or with human 11q13 and the proximal end of mouse Chr 19. Genes existing in these regions are discussed as candidate genes for Ten1. 相似文献
10.
Chris Vogliano Jessica E. Raneri Josephine Maelaua Jane Coad Carol Wham Barbara Burlingame 《Nutrients》2021,13(1)
Indigenous Solomon Islanders, like many living in Pacific Small Island Developing States (PSIDS), are currently experiencing the global syndemic—the combined threat of obesity, undernutrition, and climate change. This mixed-method study aimed to assess nutrition transitions and diet quality by comparing three geographically unique rural and urban indigenous Solomon Islands populations. Participants in rural areas sourced more energy from wild and cultivated foods; consumed a wider diversity of foods; were more likely to meet WHO recommendations of >400 g of non-starchy fruits and vegetables daily; were more physically active; and had significantly lower body fat, waist circumference, and body mass index (BMI) when compared to urban populations. Urban populations were found to have a reduced ability to self-cultivate agri-food products or collect wild foods, and therefore consumed more ultra-processed foods (classified as NOVA 4) and takeout foods, and overall had less diverse diets compared to rural populations. Clear opportunities to leverage traditional knowledge and improve the cultivation and consumption of underutilized species can assist in building more sustainable and resilient food systems while ensuring that indigenous knowledge and cultural preferences are respected. 相似文献