JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
·
IF 2.29
Xiaojie Wang,Shanshan Zhu,Xiaopo Wang
The experimental measurements for liquid viscosities of four fatty acid methyl esters, including methyl hexanoate, methyl heptanoate, methyl caprylate, and methyl nonanoate, were carried out with a falling-cylinder viscometer. For the present measurement, the temperature ranges were from 292 K to 362 K and the pressure was reached to 30 MPa. The combined expanded relative uncertainty of the viscosity measurements was within 0.03 with 0.95 confidence level. The viscosity data for each studied esters were correlated by Andrade-Tait equation, and the average absolute relative deviation between the experimental data and calculated values is 0.31%, 0.44%, 0.38%, and 0.25% for methyl hexanoate, methyl heptanoate, methyl caprylate, and methyl nonanoate, respectively. The maximum absolute relative deviation is 1.09%, 1.28%, 1.28%, and 0.75%.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
BMC PLANT BIOLOGY
·
2025
·Vol. 25
·期 1
·1-19
·
IF 4.8
Zhang Xiaoxiao,Zhu Lili,Xu Zihan,Wang Zhimin,Dai Liping
Background DNA methylation plays a key role in regulating plant growth and development, secondary metabolism, and environmental adaptability and is affected by DNA methyltransferase (C5-MTase) and demethylase (dMTase). However, the response of C5-MTase and dMTase genes to abiotic stress in Isodon rubescens remains largely unknown. Results In this study, eight IrC5-MTase genes and five IrdMTase genes were identified within the genome of I. rubescens . The IrC5-MTases were phylogenetically divided into four subfamilies (CMT, DRM, MET and DNMT2), and the IrdMTase were divided into two subgroups (ROS and DML) on the basis sequence similarity, conserved motif and domain architecture. The IrC5-MTase and IrdMTase genes were unevenly distributed on 5 and 4 chromosomes, respectively. Cis‑acting element analysis revealed that the IrC5-MTase and IrdMTase genes were enriched with multiple light-, phytohormone- and stress-responsive elements. Importantly, the level of DNA methylation in I. rubescens was influenced by different 5-azacytidine (5-azaC) concentrations or light intensities but unaffected by different NaCl concentrations. Accordingly, the expression of IrC5-MTase and IrdMTase genes were significantly upregulated or downregulated in response to different concentrations of 5-azaC or amounts of light stress, however, no conspicuous differences were observed under different degrees of NaCl stress. Expression correlation analysis revealed that the expression of IrCMT2a , IrMET1 , and IrDML4 was most closely related to the DNA methylation level in I. rubescens . Conclusions Our results reveal the characteristics and differential expression of the IrC5-MTase and IrdMTase genes in response to 5-azaC, light or NaCl stresses and will facilitate future epigenetic studies in I. rubescens .
研究领域:
植物学
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遗传学
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表观遗传学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
·
IF 3.178
Xiong Zheng,Yanqiong Bao,Dan Qu,Yu Liu,Guangzhao Qin
Fatty acid methyl esters (FAMEs) are the main component of biodiesels. Before the industrial application of FAMEs, it is essential to investigate the thermophysical properties of FAMEs. Thermal conductivity of fuels is used in various processes, such as the design of the heat transfer system and the determination of the temperature distribution of engines. Thus, it is of great significance to acquire accurate experimental data and develop reliable models for obtaining accurate thermal conductivity data of FAMEs. In this work, thermal conductivities of two short-chain FAMEs, methyl butyrate (MeC4:0) and methyl caproate (MeC6:0) were studied experimentally and theoretically. The thermal conductivities of these two FAMEs were measured by the transient hot-wire method at T = 303 to 523 K and p = 0.1 MPa to 15 MPa, the data were correlated as a polynomial function of temperature and pressure, the AADs are 0.38% for MeC4:0 and 0.42% for MeC6:0, respectively. Moreover, the experimental thermal conductivities agree well with the available data from literature. In addition, three classical models (Latini model, Sastri model, Liu model) were used to represent the present experimental data and the results show that Liu model with re-fitted parameters performs better in the prediction of the thermal conductivity of FAMEs, with regard to accuracy.
研究领域:
能源科学
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物理化学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
·
IF 2.631
Jing Fan,Zixuan Zhu,Xiaopo Wang,Fenhong Song,Lihui Zhang
One of the attempts to reduce the consumption of fossil fuels is to replace them with renewable and clean fuels. Among these fuels, biodiesel has been considered as a promising alternative to petroleum diesel fuel. Thermal conductivity of biodiesel is a very important thermophysical property for its applications. In this work, the liquid thermal conductivity of three saturated fatty acid methyl esters (methyl myristate, methyl laurate and methyl caprate), usually the significant biodiesel components, was measured with the temperature ranging within (304–402) K, (283–402) K, (267–400) K, respectively. The total standard uncertainty of the experimental results was estimated to be less than 2% and the repeatability was better than ± 0.5%. The thermal conductivity data of each substance were fitted as a function of temperature, and the average absolute relative deviation and maximum absolute relative deviation between the experimental data and calculated results were 0.13% and 0.44% for methyl myristate, 0.21% and 0.53% for methyl laurate, 0.28% and 0.80% for methyl caprate, respectively.
研究领域:
能源科学
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物理化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
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IF 2.323
Chenyang Wen,Xianyang Meng,Kaixin Wei,Jiangtao Wu
The compressed liquid viscosities of 2-methylpentane, 3-methylpentane, and 2,3-dimethylbutane were measured using a vibrating-wire viscometer over the temperature range of (273 to 343) K and at pressures up to 40 MPa. The combined expanded uncertainty of the reported viscosity is about 2% with a confidence level of 0.95 (k = 2). An empirical Andrade–Tait equation was used to correlate the viscosity as a function of temperature and pressure with average absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2016
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IF 0.661
Haidong Liu,Bo Chen,Jin Cai,Junqing Chen,Min Ji
Eleven trifluoromethylated amines were synthesised in high yield (up to 98%) under metal-free and oxidant-free conditions using iminium salts as starting material and the addition of trifluoromethyltrimethylsilane in dimethylformide containing potassium fluoride.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
·
IF 2.888
Jing Fan,Shuangshuo Liu,Qinglong Meng,Fenhong Song
In order to provide the basic thermophysical property data for the research of alternative clean fuels, the liquid thermal conductivity of methyl myristate, methyl laurate and methyl caprate which are considered as the main compounds of biodiesel was reported. The measurements of three fatty acid esters, covering a temperature range from (292 to 372) K and pressure up to 15 MPa, have been performed by a transient hot-wire technique with a bare platinum hot wire. The relative uncertainty of the experimental results was estimated to be ± 2.0% (in the 0.95 confidence level). The present thermal conductivity data were correlated as a polynomial function of temperature and pressure for the purpose of interpolation.
研究领域:
能源科学
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物理化学
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DOI
高影响因子
FLUID PHASE EQUILIBRIA
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2014
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IF 2.241
Changshen Ye,Xiaolian Dong,Wenjie Zhu,Dongren Cai,Ting Qiu
Isobaric vapor–liquid equilibrium (VLE) data for three binary systems (PM + PMA, MeAc + PM and MeOH + PMA) at 101.3 kPa were measured in a double circulating still of modified Othmer type. The thermodynamic consistency of the experimental data was checked by Herington method. The experimental data were correlated with NRTL and Wilson models. The binary interaction parameters of both models have been obtained by simplex method. The root mean square deviations (RMSD) for the vapor phase fraction and the boiling temperature are less than 0.01 and 0.5 K, respectively. The results indicate that the calculated values by NRTL and Wilson models are in good agreement with the experimental data and no azeotropic behavior has been found in the three binary systems. The research findings would provide basic data for the design and analysis of distillation process.
研究领域:
化学工程
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热力学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2019
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IF 3.372
Jun Zhang,Kaijun Dong,Weimin Luo
A facile and mild method for the catalytic production of 2,5-dimethylfuran (DMF) from 5-hydroxymethylfurfural (HMF) was developed, which utilized commercial PdCl 2 as the catalyst together with the green, non-toxic and low-cost hydride source, polymethylhydrosiloxane (PMHS). A synergistic effect among hydrogen donor, in situ generated metallic Pd 0 species and acid site HCl in the reaction played a key role in DMF formation. Gratifyingly, the desirable yield of hydrodeoxygenation product DMF as high as 89.7% from HMF was attained at room temperature (298 K) in 0.5 h. Meanwhile, biomass derived sugars also could be converted into DMF in relative high efficiency via a one-pot reaction in the present system. A plausible pathway for the hydrodeoxygenation of HMF into DMF in the present system was also proposed. The study thus highlights a new perspective for a simple, green, and efficient hydrodeoxygenation of biomass derivatives under milder conditions, employing a readily available, inexpensive and practical catalytic system of PdCl 2 -PMHS-ethanol, but without any external hydrogen supplies and pre-reduction treatments.
研究领域:
化学工程
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可再生能源
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催化化学
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2013
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IF 5.437
Yunlei Zhou,Zhenning Xu,Mo Wang,Bing Sun,Huanshun Yin,Shiyun Ai
DNA methylation has important roles in gene regulation and relates to some diseases, especially cancers. Because DNA methylation is catalyzed by DNA methyltransferases (MTase), it is important to detect the activity of DNA MTase . In this work, we developed a novel visible light-activated photoelectrochemical (PEC) biosensor for DNA MTase activity assay, whereby bismuth oxyiodide (BiOI) nanoflake was synthesized as photoactive electrode material , M. SssI MTase as methylation reagent and methyl binding domain protein (MBD1 protein) as methylation recognition element. After cytosine methylation event occurred at the site of 5′-CG-3′, it could be probed by MBD1 protein and this protein could be combined tightly with methylated cytosine, which would lead to a decreased photocurrent due to the hindrance towards electron donor transferring to electrode surface by huge-volume protein. The decreased photocurrent was proportional to M. SssI MTase concentration from 0.1 to 50 unit/mL with the detection limit of 0.035 unit/mL (S/N=3). This detection limit was lower than that in some previous reports. This PEC biosensor showed high selectivity and good reproducibility for M. SssI MTase assay. Moreover, this method was successfully applied also to screen DNA MTase inhibitors, indicating that this PEC biosensor could be an alternative platform in anti-cancer pharmaceuticals discovery.
研究领域:
生物化学
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分子生物学
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癌症研究
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分析化学
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产品关联
DOI
PubMed
高影响因子
Energies
·
2024
·Vol. 17
·期 23
·5811
·
IF 3
Qing Zou,Zhenhui Chen,Siwen Ding,Jimin Xu,Maogang He,Xiangyang Liu
As a renewable energy source and potential substitute for fossil fuels, biodiesel plays an increasingly important role in both energy security and environmental protection. Accurate thermal conductivity data of biodiesels and their mixture with diesel are critical to engine design to achieve high combustion efficiency. This study measured the thermal conductivity of binary mixtures of heptane and biodiesel components, specifically methyl myristate, methyl laurate, and methyl caprate, over a temperature range of 298.15–328.15 K, using the two-wire 3ω method. Based on the experimental data, the effect of mass fraction, temperature, and carbon chain length of the fatty acid ester on the thermal conductivity was analyzed. The second-order Scheffé polynomial model, Flippov equation, Jamieson equation, and Chen equation were used to correlate the experimental data and compare to find a better one. The Flippov equation shows the lowest absolute average relative deviation of 0.80% for the binary mixtures of heptane with methyl myristate, methyl laurate, and methyl caprate.
研究领域:
能源科学
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环境科学
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化学工程
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2018
·Vol. 219
·期 18
·1800266
·
IF 2.492
Jing Zheng,Mengxiang Zhu,Gaia Ferracci,Nam-Joon Cho,Bae Hoon Lee
Gelatin methacryloyl (GelMA; GM) is a promising nature-derived photocurable material that can mimic the extracellular matrix because GelMA features tailorable mechanical properties, proteolytic degradation, and good cell adhesion. GelMA contains not only methacrylamide but also methacrylate. However, the hydrolytic stability of methacrylamide and methacrylate groups of GelMA in aqueous solutions has not been scrutinized. Here, the structural change of GelMA through hydrolysis is investigated for the first time. The structural change of hydrolyzed GelMA is quantitatively identified using colorimetric and 1 H NMR methods. The methacrylate groups decompose markedly at high pH solutions, but the methacrylamide groups remain stable. Further, pure gelatin methacrylamide is successfully decoupled from GelMA for a better understanding of GelMA structure and future use for biomedical applications.
研究领域:
生物材料学
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组织工程学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）