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Search Results: 1 - 10 of 171718 matches for " Li-Dong Lin "
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Carbonyl 17O-NMR Chemical Shifts of Substituted Benzamides
取代苯甲酰胺的羰基17O-NMR化学位移研究

LI Li-dong,LI Lin-sheng,
李利东
,李临生

波谱学杂志 , 2005,
Abstract: This paper provides a equation, δcal(17O)=δ0n+C×Σ Δ, for calculating carbonyl 17O chemical shifts of substituted benzamides, substituted N-methyl benzamides and substituted N, N-dimethyl benzamides. Eleven substituent parameters were obtained by least square linear regression analysis. The equation is checked regressively by 33 carbonyl \{\}\+\{17\}O chemical shifts of these compounds, and the results show that the confidence limit is 99.5% and the calculating errors (Δδ) of more than 90% of the compounds are less than 1.0 (relative errors less than 0.1%).
A Method for Calculating 17O-NMR Chemical Shifts of Carbonyls of Aldehydes and Formic Acid
一般醛和甲酸羰基17O-NMR化学位移的研究

LI Li-dong,LI Lin-sheng,
李利东
,李临生

波谱学杂志 , 2005,
Abstract: This paper presents an equation: δcal=615.0+Δα for calculating 17O-NMR chemical shifts of carbonyls of aldehydes and derivatives of formic acid. Twenty-one substituent parameters for the equation were obtained by linear least square regression analysis. The validity of the equation was checked by 32 aldehydes and derivatives of formic acid. A confidence limit of 99.5% was obtained and the calculating errors for all compounds tested were less than 5.0 (relative errors 0.5%).
The Prognostic Role of RASSF1A Promoter Methylation in Breast Cancer: A Meta-Analysis of Published Data
Yong Jiang, Lin Cui, Wen-de Chen, Shi-hai Shen, Li-dong Ding
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0036780
Abstract: Purpose Epigenetic alterations have been investigated as prognostic indicators in breast cancer but their translation into clinical practice has been impeded by a lack of appropriate validation. We present the results of a meta-analysis of the associations between RASSF1A promoter methylation status and both disease free survival (DFS) and overall survival (OS) in female breast cancer. Methods Eligible studies were identified through searching the PubMed, Web of Science and Embase databases. Studies were pooled and summary hazard ratios (HR) with corresponding confidence intervals (CIs) were calculated. Funnel plots were also carried out to evaluate publication bias. Results A total of 1795 patients from eight studies were included in the meta-analysis. There are eight studies which investigated DFS in 1795 cases. The relative hazard estimates ranged from 1.77–5.64 with a combined HR of 2.75 (95%CI 1.96–3.84). The HR of RASSF1A promoter methylation on DFS adjusted for other potential prognostic factors was 2.54 (95%CI 1.77–3.66). There has been five trials which analyzed the associations of RASSF1A promoter methylation status with OS in 1439 patients. The hazard estimates ranged from 1.21–6.90 with a combined random-effects estimates of 3.47 (95%CI 1.44–8.34). OS reported in multivariate analysis was evaluated in four series comprising 1346 cases and the summarized random-effects HR estimate was 3.35 (95%CI 1.14–9.85). Additionally, no publication bias was detected for both OS and DFS. Conclusion The results of this meta-analysis suggest that RASSF1A promoter hypermethylation confers a higher risk of relapse and a worse survival in patients with breast cancer. Large prospective studies are now needed to establish the clinical utility of RASSF1A promoter methylation.
Microbiology, ecology, and application of the nitrite-dependent anaerobic methane oxidation process
Li-Dong Shen
Frontiers in Microbiology , 2012, DOI: 10.3389/fmicb.2012.00269
Abstract: Nitrite-dependent anaerobic methane oxidation (n-damo), which couples the anaerobic oxidation of methane to denitrification, is a recently discovered process mediated by “Candidatus Methylomirabilis oxyfera.” M. oxyfera is affiliated with the “NC10” phylum, a phylum having no members in pure culture. Based on the isotopic labeling experiments, it is hypothesized that M. oxyfera has an unusual intra-aerobic pathway for the production of oxygen via the dismutation of nitric oxide into dinitrogen gas and oxygen. In addition, the bacterial species has a unique ultrastructure that is distinct from that of other previously described microorganisms. M. oxyfera-like sequences have been recovered from different natural habitats, suggesting that the n-damo process potentially contributes to global carbon and nitrogen cycles. The n-damo process is a process that can reduce the greenhouse effect, as methane is more effective in heat-trapping than carbon dioxide. The n-damo process, which uses methane instead of organic matter to drive denitrification, is also an economical nitrogen removal process because methane is a relatively inexpensive electron donor. This mini-review summarizes the peculiar microbiology of M. oxyfera and discusses the potential ecological importance and engineering application of the n-damo process.
Calculation of 17O NMR Chemical Shifts of the Carboxylic Groups in Substituted Benzoic Acids
取代苯甲酸羧基中的17O NMR 化学位移研究

LI Lin-sheng,LI Li-dong,LAN Yun-jun,XIONG Jing,
李临生

波谱学杂志 , 2006,
Abstract: 提出了计算取代苯甲酸羧基17O-NMR化学位移的公式δcal(17O)=250.0 Δo Δm Δp,通过线性回归法确定了8种取代基参数.经回归检验表明该公式计算结果置信度为99.5%,羧基17O-NMR化学位移计算值与实验值的偏差Δδ全部在2.0以内.
Calculation of 17O-NMR Chemical Shifts of Carbonyl Groups in Substituted Methyl Benzoates
取代苯甲酸甲酯羰基17O-NMR化学位移研究

LI Lin-sheng,LI Li-dong,LAN Yun-jun,XIONG Jing,
李临生
,李利东,兰云军,熊静

波谱学杂志 , 2006,
Abstract: 提出了计算取代苯甲酸甲酯类化合物羰基17O-NMR化学位移的公式:cδal(17O)=337.3 Δo Δm Δp,根据52种取代苯甲酸甲酯类化合物的52个羰基17O-NMR化学位移数据,通过线性回归法结合最小二乘法求得22个用于该公式的取代基参数,回归检验表明采用该公式计算结果的置信度为99.5%,计算值与实验值的偏差Δδ在5.0以内的~100%.
Calculation of 17O-NMR Chemical Shifts of Carbonyl Groups in Carboxylic Methyl and Ethyl Esters
羧酸甲乙酯中羰基17O-NMR化学位移研究

LI Lin-sheng,LI Li-dong,LAN Yun-jun,XIONG Jing,
李临生
,李利东,兰云军,熊静

波谱学杂志 , 2006,
Abstract: 提出了计算羧酸甲乙酯中羰基17O-NMR化学位移的公式:cδal(17O)=360.0 Δα Δβ Δγ,通过线性回归法确定了22种取代基参数.经回归检验表明该公式计算结果置信度为99.5%,与实验值的偏差Δδ在5.0以内的羰基17O-NMR化学位移计算值~100%.
Calculation of 17O Chemical Shifts of Carboxylic Groups in Carboxylic Acids
羧酸羧基中17O-NMR化学位移的研究

LI Lin-sheng,LI Li-dong,LAN Yun-jun,
李临生
,李利东,兰云军

波谱学杂志 , 2006,
Abstract: 提出了计算羧酸羧基17ONMR化学位移的公式:δcal=253.0 Δα Δβ Δγ,通过线性回归法确定了17种取代基参数.经回归检验表明该公式计算结果置信度为99.5%,与实验值的偏差Δδ在5.0以内羧酸的羧基17ONMR化学位移计算值在95%以上.
Calculation of 17O-NMR Chemical Shifts of Carbonyl Groups in Substituted Benzoyl Halides
取代苯甲酰卤羰基17O-NMR化学位移的研究

LI Li-dong,LI Lin-sheng,LAN Yun-jun,
李利东
,李临生,兰云军

波谱学杂志 , 2005,
Abstract: 按照苯甲酰氯、苯甲酰氟和苯甲酰溴三类化合物,提出了一个计算这三类化合物羰基17O-NMR化学位移的公式:δcal=δ0n C×(△o △m △p),通过线性回归法确定了13种取代基参数,经回归检验表明该公式的置信度为99.5%,与实验值的偏差△δ在5.0以内的羰基17O-NMR化学位移计算值在90%以上.
Calculation of 17O-NMR Chemical Shifts of Carbonyl Groups in Substituted N-phenylamides
N-苯基酰胺中羰基17O-NMR 化学位移的研究

LI Li-dong,LI Lin-sheng,LAN Yun-jun,
李利东
,李临生,兰云军

波谱学杂志 , 2005,
Abstract: 按照N-苯基乙酰胺、N-苯基苯甲酰胺、N-苯基邻羟基苯甲酰胺和N-苯基氨基甲酸甲酯四类化合物,提出了一个计算这四类化合物羰基17O-NMR化学位移的公式:δcal=δ0n C×(△o △m △p),通过线性回归法确定了13种取代基参数,经回归检验表明该公式的置信度为99.5%,与实验值的偏差△δ在3.0以内的羰基17O-NMR化学位移计算值在95%以上.
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