首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   181篇
  免费   9篇
  国内免费   1篇
  191篇
  2023年   4篇
  2022年   5篇
  2021年   7篇
  2020年   5篇
  2019年   5篇
  2018年   7篇
  2017年   5篇
  2016年   11篇
  2015年   12篇
  2014年   14篇
  2013年   6篇
  2012年   13篇
  2011年   23篇
  2010年   10篇
  2009年   3篇
  2008年   9篇
  2007年   2篇
  2006年   7篇
  2005年   3篇
  2004年   4篇
  2003年   1篇
  2002年   3篇
  2001年   1篇
  1999年   7篇
  1998年   1篇
  1996年   1篇
  1992年   2篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1985年   2篇
  1984年   1篇
  1983年   2篇
  1980年   1篇
  1975年   2篇
  1974年   2篇
  1973年   3篇
  1972年   2篇
  1971年   1篇
  1970年   1篇
排序方式: 共有191条查询结果,搜索用时 15 毫秒
81.
IntroductionHusbands can play a crucial role in pregnancy and childbirth, especially in patriarchal societies of developing countries. In Myanmar, despite the critical influence of husbands on the health of mothers and newborns, their roles in maternal health have not been well explored. Therefore, the aim of this study was to identify the factors associated with husbands’ involvement in maternal health in Myanmar. This study also examined the associations between husbands’ involvement and their spouses’ utilization of maternal care services during antenatal, delivery and postnatal periods.MethodsA community-based, cross sectional study was conducted with 426 husbands in Thingangyun Township, Yangon, Myanmar. Participants were husbands aged 18 years or older who had at least one child within two years at the time of interview. Face to face interviews were conducted using a pretested structured questionnaire. Factors associated with the characteristics of husband’s involvement as well as their spouses’ utilization of maternal care services were analyzed by multivariable logistic regression models.ResultsOf 426 husbands, 64.8% accompanied their spouses for an antenatal visit more than once while 51.6% accompanied them for a postnatal visit. Husbands were major financial supporters for both antenatal (95.8%) and postnatal care (68.5%). Overall, 69.7% were involved in decision making about the place of delivery. Regarding birth preparedness, the majority of husbands prepared for skilled birth attendance (91.1%), delivery place (83.6%), and money saving (81.7%) before their spouses gave birth. In contrast, fewer planned for a potential blood donor (15.5%) and a safe delivery kit (21.1%). In the context of maternal health, predictors of husband’s involvement were parity, educational level, type of marriage, decision making level in family, exposure to maternal health education and perception of risk during pregnancy and childbirth. Increased utilization of maternal health services was found among spouses of husbands who accompanied them to antenatal visits (AOR 5.82, 95% CI, 3.34–10.15) and those who had a well birth plan (AOR 2.42, 95% CI, 1.34–4.39 for antenatal visit and AOR 2.88, 95% CI, 1.52–5.47 for postnatal visit).ConclusionThe majority of husbands supported their spouses’ maternal care services use financially; however, they were less involved in birth preparedness and postnatal care. Exposure to maternal health education and their maternal health knowledge were main predictors of their involvement. Women were more likely to use maternal care services when their husbands company them for ANC visits and had a well-birth plan in advance.  相似文献   
82.
83.
84.
M S Tang  H Htun  Y Cheng  J E Dahlberg 《Biochemistry》1991,30(28):7021-7026
We have determined the effect of H-DNA formation on the distributions of two ultraviolet (UV) light induced photoproducts--cyclobutane dipyrimidines and mean value of 6-4 dipyrimidines. A region of DNA containing the sequence (dT-dC)18.(dA-dG)18 was treated under conditions that specifically yield the triple-stranded H-y3 or H-y5 DNA structure and then irradiated with UV. The positions of cyclobutane dipyrimidines and mean value of 6-4 dipyrimidines were determined by T4 endonuclease V cleavage and by hot piperidine cleavage, respectively. Formation of H-DNA structures greatly decreased the photoproduct yield in the (dT-dC)18.(dA-dG)18 region but not elsewhere in the DNA. Suppression of photoproduct formation is greater in half of the repeat, reflecting whether the DNA is in the H-y3 or H-y5 conformation. Within the repeat, the suppression was less in the middle and toward the ends. Models for the suppression of photoproduct formation in H-DNA and the possible utility of our findings are discussed.  相似文献   
85.
Recent survey of the fossiliferous variegated mudstones of the PK1 locality (Sabapondaung) in the late middle Eocene Pondaung Formation (central Myanmar) has led to the recovery of a partial right innominate of a relatively large-bodied primate. Given its size and provenance, this bone probably belongs to the same individual represented by the NMMP 20 primate partial skeleton described previously from the same locality. The new fossil, which preserves the region around the acetabulum and the adjacent part of the ilium, clearly exhibits strepsirrhine rather than anthropoid affinities. This addition to our knowledge of the NMMP 20 partial skeleton allows us to reassess the different locomotor interpretations that have been proposed for this specimen. Aspects of pelvic morphology suggest that the NMMP 20 partial skeleton documents a primate that probably engaged in active arboreal quadrupedalism similar to that practiced by medium-sized Malagasy lemurids rather than lorislike slow moving and climbing. Given the conflicting phylogenetic signals provided by NMMP 39 (a talus showing anthropoid affinities) and NMMP 20 (a partial skeleton bearing adapiform affinities), it appears that two higher-level taxonomic groups of relatively large-bodied primates are documented in the Pondaung Formation. The recent discovery of two taxa of sivaladapid adapiforms from the Pondaung Formation indicates that the assumption that the NMMP 20 partial skeleton belongs to an amphipithecid can no longer be sustained. Instead, this specimen apparently documents a third large-bodied sivaladapid species in the Pondaung Formation.  相似文献   
86.
87.
An elevated level of tumor necrosis factor (TNF)-α is implicated in several cardiovascular diseases including heart failure. Numerous reports have demonstrated that TNF-α activates nuclear factor (NF)-kappaB, resulting in the upregulation of several genes that regulate inflammation, proliferation, and apoptosis of cardiomyocytes. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, a major source of reactive oxygen species (ROS), is also activated by TNF-α and plays a crucial role in redox-sensitive signaling pathways. The present study investigated whether NADPH oxidase mediates TNF-α-induced NF-kappaB activation and NF-kappaB-mediated gene expression. Human cardiomyocytes were treated with recombinant TNF-α with or without pretreatment with diphenyleneiodonium (DPI) and apocynin, inhibitors of NADPH oxidase. TNF-α-induced ROS production was measured using 5-(and-6)-chloromethyl-2’, 7’-dichlorodihydrofluorescein diacetate assay. TNF-α-induced NF-kappaB activation was also examined using immunoblot; NF-kappaB binding to its binding motif was determined using a Cignal reporter luciferase assay and an electrophoretic mobility shift assay. TNF-α-induced upregulation of interleukin (IL)-1β and vascular cell adhesion molecule (VCAM)-1 was investigated using real-time PCR and immunoblot. TNF-α-induced ROS production in cardiomyocytes was mediated by NADPH oxidase. Phosphorylation of IKK-α/β and p65, degradation of IkappaBα, binding of NF-kappaB to its binding motif, and upregulation of IL-1β and VCAM-1 induced by TNF-α were significantly attenuated by treatment with DPI and apocynin. Collectively, these findings demonstrate that NADPH oxidase plays a role in regulation of TNF-α-induced NF-kappaB activation and upregulation of proinflammatory cytokines, IL-1β and VCAM-1, in human cardiomyocytes.  相似文献   
88.

Background

Ewing''s sarcoma (ES) and desmoplastic small round cell tumors (DSRCT) are small round blue cell tumors driven by an N-terminal containing EWS translocation. Very few somatic mutations have been reported in ES, and none have been identified in DSRCT. The aim of this study is to explore potential actionable mutations in ES and DSRCT.

Methodology

Twenty eight patients with ES or DSRCT had tumor tissue available that could be analyzed by one of the following methods: 1) Next-generation exome sequencing platform; 2) Multiplex PCR/Mass Spectroscopy; 3) Polymerase chain reaction (PCR)-based single- gene mutation screening; 4) Sanger sequencing; 5) Morphoproteomics.

Principal Findings

Novel somatic mutations were identified in four out of 18 patients with advanced ES and two of 10 patients with advanced DSRCT (six out of 28 (21.4%));KRAS (n = 1), PTPRD (n = 1), GRB10 (n = 2), MET (n = 2) and PIK3CA (n = 1). One patient with both PTPRD and GRB10 mutations and one with a GRB10 mutation achieved a complete remission (CR) on an Insulin like growth factor 1 receptor (IGF1R) inhibitor based treatment. One patient, who achieved a partial remission (PR) with IGF1R inhibitor treatment, but later developed resistance, demonstrated a KRAS mutation in the post-treatment resistant tumor, but not in the pre-treatment tumor suggesting that the RAF/RAS/MEK pathway was activated with progression.

Conclusions

We have reported several different mutations in advanced ES and DSRCT that have direct implications for molecularly-directed targeted therapy. Our technology agnostic approach provides an initial mutational roadmap used in the path towards individualized combination therapy.  相似文献   
89.
90.
?12 fatty acid desaturase (FAD2) is a key enzyme for linoleic acid and linolenic acid biosynthesis. Perilla frutescens is a special oil plant species with highest linolenic acid content. In this study, based on RACE, two alleles for one FAD2 gene were isolated from P. frutescens cultivar C2: the 3956 bp PfFAD2a and the 3959 bp PfFAD2b, both with a full-length cDNA of 1526 bp, and both encoding a 382aa basic protein. The alleles have identities of over 98%, and their encoded proteins differ only by substitution of a strongly similar residue. Saccharomyces cerevisiae heterologous expression suggested that PfFAD2a/b both encode a bio-functional FAD2 enzyme. Phylogenetic analyses indicated that PfFAD2 shows the highest homologies to FAD2 genes from dicots such as Boraginaceae and Burseraceae. PfFAD2a/b expressions are mainly restricted to developing seeds. PfFAD2a/b expression in the seedling leaf is upregulated by cold (4 °C) and repressed by heat (42 °C). Each of the eight cultivars contains two alleles for one PfFAD2 and 40 SNP sites are found. One allelic gene in cultivars C1 and P1 is pseudogene because of premature stop codon mutation in 5′ coding region. All other normal PfFAD2 genes/allelic genes encode identical or very similar proteins. PfFAD2a/b expression level in developing seeds also varies among the eight cultivars. This study provides systemic molecular and functional features of PfFAD2 and enables its application in the study of plant fatty acids traits.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号