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Search Results: 1 - 10 of 16039 matches for " Rui Tong "
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A comparison of three pH control methods for revealing effects of undissociated butyric acid on specific butanol production rate in batch fermentation of Clostridium acetobutylicum
Xuepeng Yang, Maobing Tu,, Rui Xie, Sushil Adhikari and Zhaohui Tong
AMB Express , 2013, DOI: 10.1186/2191-0855-3-3
Abstract: pH control has been essential for butanol production with Clostridium acetobutylicum. However, it is not very clear at what pH level the acid crash will occur, at what pH level butanol production will be dominant, and at what pH level butyric acid production will be prevailing. Furthermore, contradictory results have been reported about required acidic conditions for initiation of solventogenesis. In this study, with the aim of further understanding the role of undissociated butyric acid in butanol production, we investigated the correlation between undissociated butyric acid concentration and specific butanol production rate in batch fermentation of Clostridium acetobutylicum by comparing three pH control approaches: NaOH neutralization (at 12, 24 or 36 h), CaCO3 supplementation (2, 5, or 8 g/l) and NaOAc buffering (pH 4.6, 5.0 or 5.6). By neutralizing the fermentation pH to ~5.0 at different time, we observed that neutralization should take place at the beginning of exponential phase (12 h), and otherwise resulting in lower concentrations of undissociated butyric acid, cell biomass and final butanol. CaCO3 supplementation extended cell growth to 36 h and resulted in higher butyrate yield under 8 g/L of CaCO3. In the NaOAc buffering, the highest specific butanol rate (0.58 h 1) was associated with the highest undissociated butyric acid (1.92 g/L). The linear correlation of the undissociated butyric acid with the specific butanol production rates suggested the undissociated butyric acid could be the major driving force for butanol production.
Catalytic performance of Fe3O4-CoO/Al2O3 catalyst in ozonation of 2-(2,4-dichlorophenoxy)propionic acid, nitrobenzene and oxalic acid in water

Tong Shaoping,Shi Rui,Zhang Hua,Ma Chunan,

环境科学学报(英文版) , 2010,
Abstract: Fe3O4-CoO/Al2O3 catalyst was prepared by incipient wetness impregnation using Fe(NO3)3 9H2O and Co(NO3)2 6H2O as the precursors, and its catalytic performance was investigated in ozonation of 2-(2,4-dichlorophenoxy)propionic acid (2,4-DP), nitrobenzene and oxalic acid. The experimental results indicated that Fe3O4-CoO/Al2O3 catalyst enabled an interesting improvement of ozonation e ciency during the degradation of each organic pollutant, and the Fe3O4-CoO/Al2O3 catalytic ozonation system followed a radical-type mechanism. The kinetics of ozonation alone and Fe3O4-CoO/Al2O3 catalytic ozonation of three organic pollutants in aqueous solution were discussed under the mere consideration of direct ozone reaction and OH radical reaction to well investigate its performance. In the catalytic ozonation of 2,4-DP, the apparent reaction rate constants (k) were determined to be 1.456 10??2 min??1 for ozonation alone and 4.740 10??2 min??1 for O3/Fe3O4-CoO/Al2O3. And O3/Fe3O4-CoO/Al2O3 had a larger Rct (6.614 10??9) calculated by the relative method than O3 did (1.800 10??9), showing O3/Fe3O4-CoO/Al2O3 generated more hydroxyl radical. Similar results were also obtained in the catalytic ozonation of nitrobenzene and oxalic acid. The above results demonstrated that the catalytic performance of Fe3O4-CoO/Al2O3 in ozonation of studied organic substance was universal to a certain degree.
Rescaled Range Analysis Applied to the Study on Intracellular Ca2+
Tong-Han Lan,Jia-Rui Lin
Pakistan Journal of Biological Sciences , 2003,
Abstract: The present study revealed the stimulatory effects of NMDA on intracellular Ca2+ concentration in rat dorsal root ganglion (DRG) neurons. Fura-3/AM, an intracellular calcium fluorescent indicator was used to monitor the fluctuation of [Ca2+]I. Using the Confocal microscopy technique and the rescaled range method, Intracellular Ca2+ concentration variation was studied. The time-related variation of fluorescence intensity was observed. The Rescaled Range analysis showed that there were persistent correlations. The Hurst coefficients were calculated for four kinds of different external solutions which are 0.559 0.0542(n=13) for 0.5 ml of 2 10-4M NMDA and 3.3mM Ca2+ bath solution; 0.8488 0.0805 (n=10) for 0.5 ml of 2 10 4 M NMDA and 6.6 mM Ca2+ bath solution; 0.8924 0.0679 (n=11) for 0.5 ml of 2 10-4 M NMDA and 10mM Ca2+ bath solution; 0.9192 0.037 (n=8) for 0.5 ml of 2 10-4 M NMDA and 0 mM Ca2+ bath solution adding high Ca2+ (10mM). These results indicate that persistent correlation for the long intervals can arise from the fact that the natural system is bounded. It also suggests that the mean and the variance of the intracellular Ca2+ concentration may not be good measures to estimate the intracellular Ca2+ kinetics and to determine the effectiveness of NMDA.
Pentaaqua(5-carboxypyridine-2-carboxylato-κ2N,O2)(pyridine-2,5-dicarboxylato-κ2N,O2)cerium(III) tetrahydrate
Ning Ma,Tong Zhang,Guang-Rui Yang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811052688
Abstract: In the title compound, [Ce(C7H3NO4)(C7H4NO4)(H2O)5]·4H2O, the Ce3+ ion is nine-coordinated by two O atoms and two N atoms from one single and from one double deprotonated pyridine-2,5-dicarboxylate ligand and five water molecules in a distorted monocapped square-antiprismatic geometry. In the crystal, extensive O—H...O hydrogen-bonding interactions result in a three-dimensional supramolecular architecture.
Impact of Glutathione-S-Transferases (GST) Polymorphisms and Hypermethylation of Relevant Genes on Risk of Prostate Cancer Biochemical Recurrence: A Meta-Analysis
Rui Chen, Shancheng Ren, Tong Meng, Josephine Aguilar, Yinghao Sun
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0074775
Abstract: Introduction Accurate prediction of the biochemical recurrence (BCR) is critical for patients after intended curative therapy like radical prostatectomy (RP) or definitive radiotherapy for prostate cancer. Glutathione-S-transferases polymorphisms as well as hypermethylation of GSTP1 and functional genes in carcinogenesis, including tumor suppression gene (APC), hormone receptor that regulates cell growth and differentiation gene (RARbeta) were reported to be associated with BCR. Nevertheless, the reported results are inconsistent. To evaluate the relationship between glutathione-S-transferases polymorphisms and hypermethylation of these genes and the risk of prostate cancer BCR, we carried out a meta-analysis of the published studies. Methods and Materials We performed a search in Medline, Embase and CNKI database with GST, APC, RARbeta in combination with single nucleotide polymorphism, hypermethylation, prostate cancer and recurrence. Languages were restricted to English and Chinese. Results Our study included 4 case-control studies and 7 cohort studies including 12 data sets and 3,037 prostate cancer patients. We confirmed that APC hypermethylation is associated with a modest hazard for biochemical recurrence after RP (HR = 1.85, 95%CI = 1.12–3.06). We also suggest GSTP1 polymorphism and CpG hypermethylation tested in serum are associated with BCR (HR = 1.94, 95%CI = 1.13–3.34). We also identified a possible association between GSTM1 null polymorphism and prostate cancer biochemical recurrence risk with borderline significance (HR = 1.29, 95%CI = 0.97–1.71). Conclusion To our knowledge, this is the first meta-analysis evaluating the relationship of polymorphisms and hypermethylation in GSTs and biochemical recurrence. GSTM1, GSTP1 polymorphisms and hypermethylation of GSTP1, APC may be potential biomarkers for the evaluation of the probability of BCR. Further studies are warranted to validate these findings in larger cohorts with longer follow-up.
Three industries and wastewater and COD discharge of Beijing
WANG Yan,Wang Hong-rui,NING Da-tong,
WANG Yan
,WANG Hong-rui,NING Da-tong

环境科学学报(英文版) , 2000,
Abstract: With the swift development of economy, the water quality of Beijing is becoming worse day by day and hampers the sustainable development obviously. In this paper, the current conditions of the municipal wastewater structure in the industrial sectors are analysed and discussed in terms of the indicators, such as direct wastewater\|discharge coefficient, complete wastewater\|discharge coefficient, direct discharge coefficient of COD and complete discharge coefficient of COD, by taking a year of 1990s as the base year. Some countermeasures are studied and the corresponding recommendations are put forward in order to improve the water environment in Beijing. This provides a scientific ground for coordinating the relationship between the aquatic environment and economic growth in this city.
Adsorptive property of Cu2+-loaded montmorillonite clays for Escherichia coli K88 in vitro
Adsorptive property of Cu^2+-loaded montmorillonite clays for Escherichia coli K_(88) in vitro

Tong Guo,Shoujun Cao,Rui Su,Zhiqiang Li,Ping Hu,Zirong Xu,
Tong Guo
,Shoujun Cao,Rui Su,Zhiqiang Li,Ping Hu,Zirong Xu

环境科学学报(英文版) , 2011,
Abstract: The adsorption properties of Cu2+-loaded montmorillonite clays (MMT-Cu) for Escherichia coli K88 as a function of time, bacteria concentrations, pH, ionic strength and temperature were investigated. The results showed that the bacteria adsorption onto MMT-Cu surface reached equilibrium after 90 min. The percentages of E. coli K88 adsorbed onto the surfaces of MMT-Cu and montmorillonite clays (MMT) at equilibrium were 88.9% and 56.5%, respectively. Scanning electron microscopy revealed that a lot of E. coli K88 adhered to the surface of MMT-Cu. The zeta potential of MMT-Cu was relatively high as compared to that of MMT. The adsorptive ability of MMT-Cu for E. coli K88 was higher than that of MMT (P < 0.05). Moreover, pH, ionic strength and temperature produced a strong influence on the extent of E. coli K88 adsorption to surface of MMT-Cu and MMT. The mechanism of adsorption of E. coli onto MMT-Cu may involve electrostatic attraction and physiochemical properties of bacterial cell walls and minerals surfaces.
Inoculations with Arbuscular Mycorrhizal Fungi Increase Vegetable Yields and Decrease Phoxim Concentrations in Carrot and Green Onion and Their Soils
Fa Yuan Wang,Rui Jian Tong,Zhao Yong Shi,Xiao Feng Xu,Xin Hua He
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016949
Abstract: As one of the most widely used organophosphate insecticides in vegetable production, phoxim (C12H15N2O3PS) is often found as residues in crops and soils and thus poses a potential threat to public health and environment. Arbuscular mycorrhizal (AM) fungi may make a contribution to the decrease of organophosphate residues in crops and/or the degradation in soils, but such effects remain unknown.
A New Natural Ceramide from Trollius chinensis Bunge
Ru-Feng Wang,Rui-Ning Liu,Tong Zhang,Tao Wu
Molecules , 2010, DOI: 10.3390/molecules15107467
Abstract: A new natural product named trolliamide was isolated from Trollius chinensis Bunge. Its structure was determined as 2-hydroxy-tetracosanoic acid(2,3-dihydroxy-1-hydroxymethyl-heptadec-7-enyl)-amide by spectroscopic methods, including UV, IR, MS and NMR. This is the first report of a ceramide isolated from Trollius chinensis.
Electronic Structure and Substituent Effect of o-, m- and p-C6H4INCS
ompSheng-Rui Tong, Mao-Fa Ge, Li YaoLin Duo-, m-ppp
The Open Chemical Physics Journal , 2008, DOI: 10.2174/1874412500801010012]
Abstract: Aromatic isothiocyanates are interesting pseudohalides molecules which are widely existed in healthy intact plants. However, few attempts were made to analyze their structures and correlate their electronic structure with other properties (e.g., chemical reactivity). In this paper, the electronic structures and substituent effects of o-, m-, and p-iodophenyl isothiocyanates were studied by the ultraviolet photoelectron spectroscopy and discussed through the careful analysis of ionization potentials corresponding to π and n orbitals. Owing to the effects of the iodine atom and the NCS group, the first ionization potentials of iodophenyl isothiocyanates are lower than that of iodobenzene and phenyl isothiocyanate. And the energetic order of the first six MOs is π3 > π2 > nS > n > πNCS > n┴. The energy and electron density of the topmost occupied molecular orbitals of iodophenyl isothiocyanates were analyzed. It has been found that the ionization energy of πNCS orbital electrons in p-iodophenyl isothiocyanate is the lowest of the three iodophenyl isothiocyanates, which indicates the chemical reactivity of p-iodophenyl isothiocyanate is the highest.
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