检索结果-内蒙古大学图书馆

High capacity adsorption of iodine gas by Ag⁰@c/SiO2 derived from rice husk: synergistic effect between c/SiO2 supports and Ag⁰ sites

引用

JOURNAL OF RADIOANALYTIcAL AND NUcLEAR cHEMISTRY 2023年第8期332卷 3059-3068页

作者： Xiong, Yingwei Ai, Yanru Wang, Hongxun Wang, Enchao Dan, Hui Ding, Yi Mianyang TeachersCollege Chuanxibei RHS Construct Mianyang Teachers Coll Si Engn Res Ctr Mianyang 621000 Peoples R China Technol Res Inst Ecol Energy Saving Environm Protect & Low Carbon Mianya Mianyang 621010 Peoples R China Southwest Univ Sci & Technol Sch Natl Def Sci & Technol Mianyang 621010 Peoples R China

A series of Ag-0@c/SiO2 adsorbents were prepared using rice husk-based c/SiO2 as supports and applied to capture iodine gas. The results demonstrated that 50%Ag-0@c/SiO2 reached a record high iodine adsorption capacity (788 +/- 25 mg/g) due to the synergistic effect between c/SiO2 supports and Ag-0 sites. The adsorption data of Ag-0@c/SiO2 can be better fitted with the pseudo first order and Langmuir models. The iodine adsorption process included the physical and chemical adsorption. The adsorption mechanism was that Ag-0 reacted with I-2 to form AgI. Owing to the excellent adsorption capacity, Ag-0@c/SiO2 derived from rice husk could be promising iodine gas adsorbents.

关键词： Iodine gas Silver Rice husk c SiO2 Adsorption

来源：评论

学校读者我要写书评

暂无评论

The response of c/N/S cycling functional microbial communities to redox conditions in shallow aquifers using in-situ sediment as bio-trap matrix

引用

ENVIRONMENTAL TEcHNOLOGY 2024年第18期45卷 3666-3678页

作者： Li, cui chen, Rong Ouyang, Weiwei Xue, chen Liu, Minghui Liu, Hui China Univ Geosci Sch Environm Studies Hubei Key Lab Yangtze Catchment Environm Aquat Sci 388 Lumo Rd Wuhan 430074 Peoples R China China Univ Geosci State Key Lab Biogeol & Environm Geol Wuhan 430078 Hubei Peoples R China Hubei Ecol Polytech Coll Wuhan Peoples R China Wuhan Technol & Business Univ Sch Environm & Biol Engn Wuhan Peoples R China

Microbial communities are fundamental components driving critical biogeochemical carbon (c), nitrogen (N) and sulfur (S) cycles in groundwater ecosystems. The reduction-oxidation (redox) potential is one important environmental factor influencing the microbial community composition. Here, we developed a bio-trap method using in-situ sediment as a matrix to collect aquifer sediment samples and evaluate the response of microbial composition and c/N/S cycling functions to redox variations created by providing sole O-2, joint O-2 and H-2, and sole H-2 to three wells. Illumina sequencing analyses showed that the microbial communities in the bio-trap sediment could respond quickly to redox changes in the wells, demonstrating that this bio-trap method is promising for detecting microbial variation in the aquifer sediment. The microbial metabolic functions related to c, N and S cyclings and organic pollutants degradation were predicted by the Kyoto Encyclopedia of Genes and Genomes (KEGG) approach. It was found that the joint O-2 and H-2 injection produced medium oxidation-reduction potential (ORP -346 and -614 mV) and enhanced more microbial functions than sole O-2 or H-2,H- which mainly include oxidative phosphorylation, most carbon source metabolism, various pollutants degradation, and nitrogen and sulfur metabolism. Moreover, the functional genes encoding phenol monooxygenase, dioxygenase, nitrogen fixation, nitrification, aerobic and anaerobic nitrate reductase, nitrite reductase, nitric oxide reductase, and sulfur oxidation increased. These findings tell us the contaminant bioremediation and N, S metabolism can be promoted by adjusting ORP realised by injecting joint O-2 and H-2.

关键词： Bio-trap microbial community functional genes c N S metabolism redox conditions

来源：评论

学校读者我要写书评

暂无评论

Soil c and N dynamics and maize (Zea may L.) yield as affected by croping systems and residue management in North-western Pakistan

引用

SOIL & TILLAGE RESEARcH 2007年第2期94卷 520-529页

作者： Shafi, Mohammad Bakht, Jehan Jan, Mohammad Tariq Shah, Zahir Agr Univ NWFP Dept Agron Peshawar Pakistan Agr Univ NWFP Dept Soil Sci & Environm Sci Peshawar Pakistan

This paper presents the results of irrigated rotation experiment, conducted in the North West Frontier Province (NWFP), Pakistan, during 1999-2002 to evaluate effects of residues retention, fertilizer N and legumes in crop rotation on yield of maize (Zea mays L.) and soil organic fertility. chickpea (cicer arietinum Q and wheat (Triticum aestivum Q were grown in the winters and mungbean (Vigna radiata) and maize in the summers. Immediately after grain harvest, above-ground residues of all crops were either completely removed (-residue), or spread across the plots and incorporated by chisel plough by disc harrow and rotavator (+residue). Fertlizer N rates were nil or 120 kg ha(-1) for wheat and nil or 160 kg ha(-1) for maize. Our results indicated that post-harvest incorporation of crop residues significantly (p < 0.05) increased the grain and stover yields of maize during both 2000 and 2001. On average, grain yield was increased by 23.7% and stover yield by 26.7% due to residue incorporation. Residue retention also enhanced N uptake by 28.3% in grain and 45.1% in stover of maize. The soil N fertility was improved by 29.2% due to residue retention. The maize grain and stover yields also responded significantly to the previous legume (chickpea) compared with the previous cereal (wheat) treatment. The legume treatment boosted grain yield of maize by 112% and stover yield by 133% with 64.4% increase in soil N fertility. Similarly, fertilizer N applied to previous wheat showed considerable carry over effect on grain (8.9%) and stover (40.7%) yields of the following maize. Application of fertilizer N to current maize substantially increased grain yield of maize by 110%, stover yield by 167% and soil N fertility by 9.8% over the nil N fertilizer treatment. We concluded from these experiments that returning of crop residues, application of fertilizer N and involvement of legumes in crop rotation greatly improves the N economy of the cropping systems and enhances crop produc

关键词： maize N c crop residues cropping systems

来源：评论

学校读者我要写书评

暂无评论

correlation Between Unfolded States of Apocytochrome c and Its Ability to Pass Lipid Bilayer

引用

Science china chemistry 1994年第11期37卷 1341-1349页

作者：王贤树童俊超韩学海杨福愉 National Laboratory of Biomacromolecules Institute of BiophysicsAcademia SinicaBeijing 100101PRC

In contrast to the horse heart apocytochrome c,the chicken heart apocytochrome c under-went a conformational change from random coil to partial folding during a renaturation *** theapocytochrome horse heart and that of chicken heart c were subjected to a translocation assay in vitro usinglarge trypsin-enclosed unilamellar vesicles from soybean phospholipids,the ability of the chicken heart apoc-ytochrome c to penetrate into the liposomes was found to decrease markedly with the renaturation procedure,while that of horse heart apocytochrome c remained relatively *** from circular dichroismmeasurement on the induction of secondary folding of these two species of apocytochrome c upon interactionwith soybean phospholipid vesicles suggested that a more flexible structure of apocytochrome c embedded inthe lipid matrix be required for its efficient translocation across the bilayer.

关键词： apocytochrome c translocation unfolded state

来源：评论

学校读者我要写书评

暂无评论

The effect of Ru/c and Mgcl2 on the cleavage of inter- and intra-molecular linkages during cornstalk hydrolysis residue valorization

引用

cELLULOSE 2020年第2期27卷 799-823页

作者： Lv, Wei Liao, Yuhe Zhu, Yuting Liu, Jing Zhu, changhui Wang, chenguang Xu, Ying Zhang, Qi chen, Guanyi Ma, Longlong Chinese Acad Sci Guangzhou Inst Energy Convers CAS Key Lab Renewable Energy Guangdong Prov Key Lab New & Renewable Energy Res 2 Nengyuan Rd Guangzhou 510640 Peoples R China Tianjin Univ Sch Environm Sci & Engn 92 Weijin Rd Tianjin 300000 Peoples R China Katholieke Univ Leuven Ctr Surface Chem & Catalysis Celestijnenlaan 200F B-3001 Heverlee Belgium Key Lab Biomass Energy & Mat 16 5th Suojin Village Nanjing 210018 Jiangsu Peoples R China

The cleavage of linkages of lignocellulose is important for its valorization. The linkage cleavage of cornstalk hydrolysis residue was investigated over catalysts (Ru/c + Mgcl2) in EtOAc/H2O solvents. The results show that almost hydrogen bonds, c-c bonds, ether and ester bonds in the matrix of lignin and cellulose were broken, accompanying 80.6% of lignin and 98.5% of cellulose conversion, and obtaining 37.5% of aromatic monomers and 28.8% of lignin oligomers. In the reaction system, biphasic EtOAc/H2O solvents exhibited an effect on cleaving the intermolecular linkages between lignin and cellulose. Mgcl2 showed limited abilities of breaking the alpha-O-4 and beta-O-4 linkages in lignin and limited beta-1, 4-glycosidic and hydrogen bonds in cellulose were cleaved over Ru/c catalyst. The cleavage of c-O linkages (alpha-O-4, beta-O-4, 4-O-5) and c-c bonds (alpha-beta, beta-5) in lignin were mainly dependent on Ru/c catalyst. Much c-O and the stubborn c-c linkages of beta-5, beta-1 and 5-5 were significantly disrupted by the synergistic effect between Mgcl2 and Ru/c. However, Mgcl2 exhibited great contribution to breakage of beta-1, 4-glycosidic linkage, hydrogen bonds and sugar ring of cellulose. The linkage of beta-1, 4-glycosidic, hydrogen bonds and c-c in c5/c6 sugars were significantly broken. The increased yield of products was evidently due to the synergistic effect of Ru/c combined with Mgcl2.

关键词： cleavage of linkage Biphasic EtOAc H2O solvents Ru c Mgcl2 cornstalk hydrolysis residue (cHR) Valorization

来源：评论

学校读者我要写书评

暂无评论

Acinetobacter sp. mediated synthesis of AgNPs, its optimization, characterization and synergistic antifungal activity against c. albicans

引用

JOURNAL OF APPLIED MIcROBIOLOGY 2019年第2期127卷 445-458页

作者： Nadhe, S. B. Singh, R. Wadhwani, S. A. chopade, B. A. Savitribai Phule Pune Univ Dept Microbiol Pune Maharashtra India SIES Coll Arts Sci & Commerce Dept Biotechnol Mumbai Maharashtra India Dr Babasaheb Ambedkar Marathwada Univ Aurangabad 431004 Maharashtra India

Aims To synthesize silver nanoparticles (AgNPs) with cell free extract of Acinetobacter sp. and evaluate antifungal activity against planktonic and biofilm of candida. Also, to study mechanism of antifungal action of AgNPs. Methods and Result Acinetobacter spp were screened for synthesis of AgNPs. Physio-chemical parameters were optimized to obtained monodispersed nanoparticles. Optimized nanoparticles were characterized using spectroscopic, microscopic and diffraction techniques. Antifungal and biofilm disruption activity of AgNPs (10 +/- 5 nm) were investigated against c. albicans. Mechanism of antifungal activity of nanosilver was deduced by growth curve, reactive oxygen species generation, thiol interaction and microscopic analysis. Acinetobacter sp. GWRFH 45 gave maximum synthesis of AgNPs. At optimized condition monodispersed, spherical nanoparticles were obtained which were crystalline with negative surface charge. AgNPs exhibited antifungal activity against planktonic cells and biofilm of candida. AgNPs showed synergistic effect with amphotericin B as well as fluconazole against biofilm disruption. AgNPs were found to affect growth of candida, generate reactive oxygen species and disrupt cellular morphology. conclusions cell free extract of A. calcoaceticus GWRFH 45 has ability to synthesize AgNPs. AgNPs alone and in combination with drugs have potential to inhibit c. albicans. Significance and Impact of the Study This is the first report of bacteriogenic AgNPs used in combination with antifungal drugs against candida.

关键词： Acinetobacter sp AgNPs antifungal biofilm c albicans disrupt morphology reactive oxygen species

来源：评论

学校读者我要写书评

暂无评论

Parameters Optimization of Laser-Grinding chain for Processing Groove of 2.5-Dimensional c/Sic composites

引用

MATERIALS 2023年第13期16卷 4761-4761页

作者： Liu, Guoyue Wang, Jian chen, Bing Guo, Bing Zhang, Hua Wang, Zhaohui Hunan Univ Sci & Technol Sch Mech Engn Hunan Prov Key Lab High Efficiency & Precis Machin Xiangtan 411201 Peoples R China Hunan Taijia New Mat Technol Co Ltd Changsha 410203 Peoples R China Harbin Inst Technol Ctr Precis Engn Sch Mechatron Engn Harbin 150001 Peoples R China Wuhan Univ Sci & Technol Coll Mech Automat Wuhan 430081 Peoples R China

Aiming at problems such as poor precision of laser processing c/Sic composites, low efficiency of grinding c/Sic composites, and serious wear of grinding wheel, a method of laser-grinding chain processing c/Sic composite groove was proposed in this paper. The method combined the high efficiency characteristic of laser ablating and the high precision characteristic of grinding. The relationship between laser processing parameters and the characteristics of ablative grooves was investigated, and the appropriate laser processing parameters were optimized, and then, to further improve the processing quality of the grooves, the grinding parameters optimization experiments of the grooves of c/Sic composites were carried out. The results showed that the c/Sic composites could be quickly removed by laser processing, and the grooves with relatively good size and shape accuracy could be obtained by laser parameters optimization experiments, but the side wall of the groove still had a certain inclination and the surface quality of the groove was yet poor;meanwhile, the size accuracy, shape accuracy, and surface quality of the grooves were greatly improved by further grinding. In addition, then, through the laser and grinding optimization experiments, the optimized parameters were obtained, where the laser power was 80 W, the scanning speed was 300 mm/s, the scanning frequency was 50 kHz, the scanning spacing was 25 & mu;m, the depth of cut was 30 & mu;m, the liner speed of wheel was 62.832 m/min, and the feed speed was 10 mm/min. With these parameters, the time used to process the groove with the laser-grinding chain was about 23/40 of the grinding process, and the quality of grooves could be guaranteed. Therefore, combined with the optimized process parameters, the laser-grinding chain processing scheme could be used to achieve high efficiency and precision grinding of c/Sic composite grooves.

关键词： c Sic composite laser-grinding chain processing groove feature parameter optimization

来源：评论

学校读者我要写书评

暂无评论

Regenerated LiFePO4/c for scrapped lithium iron phosphate powder batteries by pre-oxidation and reduction method

引用

IONIcS 2022年第5期28卷 2125-2133页

作者： Zhang, Hao Wang, Lihua chen, Yongzhi Wen, Xu Changsha Univ Coll Mech & Elect Engn Changsha 410022 Peoples R China Hunan Inst Sci & Technol Coll Mech Engn Yueyang 414006 Peoples R China

The cathode materials of scrapped lithium-iron phosphate battery are mainly composed of LiFePO4/c, conductive agent and PVDF, etc. Unreasonable disposal will cause serious environmental pollution and waste of scarce resources. In this paper, cathode materials were regenerated by pre-oxidation and reduction method. Impurities such as carbon coating, conductive agent, and PVDF were removed and LiFePO4/c was converted to Fe2O3 and Li3Fe2(PO4)(3) by pre-oxidation. After the addition of sucrose, regeneratedLiFePO(4)/c was synthesized under reduction process. The effects of calcination temperature and sucrose addition on the microstructure and electrochemical properties of regenerated LiFePO4/c were studied. The regenerated LiFePO4/c had excellent cycling stability when the sucrose addition was 12% and calcined at 700 celcius. The initial discharge specific capacity of regenerated LiFePO4/c was 145.51 mAh g(-1) at 0.5 c. After 200 cycles, the discharge specific capacity was 145.25 mAh g(-1) (capacity retention rate: 99.82%). It provides a new inspiration for the high-value recycling and regeneration of the other scrapped lithium-ion batteries.

关键词： Scrapped lithium-ion batteries Regenerated LiFePO4 c Pre-oxidation and reduction

来源：评论

学校读者我要写书评

暂无评论

DEcARBURIZATION OF FE-cR-c STEELS DURING HIGH-TEMPERATURE OXIDATION

引用

OXIDATION OF METALS 1988年第5-6期29卷 419-433页

作者： HAJDUGA, M KUcERA, J CZECHOSLOVAK ACAD SCI INST PHYS METCS-61662 BRNOCZECHOSLOVAKIA

Isothermal oxidation treatments were carried out on Fe-cr-c steels. The steels containing 0.08, 0.15, 0.17, 0.88, 1.51, and 12.77wt.% cr and 0.10, 0.49, 1.19, 0.18, 1.05, and 1.63 wt.% c were oxidized in ambient air at temperatures of 900, 1000, and 1200°c. Steels containing 13.22, 12.90, 12.52, and 12.77wt.% cr and 0.15, 0.30, 0.50, and 1.63 wt.% c were heated (1100°c/3hr) in a flowing atmosphere of O_class="a-plus-plus">2-N_{class="a-plus-plus">2}-He in a SETARAM thermobalance. Evidence of decarburization of the steels is given by metallographic observations, by direct measurements of carbon diffusivities from the decarburization profiles in the oxidized samples, and by the results of kinetics measurements.^{class="a-plus-plus">3} carbon diffusion coefficients were measured by the standard sectioning method in the samples oxidized in air. A. generalized equation for carbon diffusivity in Fe-cr-c alloys is developed in terms of N_{class="a-plus-plus">cr}[wt.%], N_{class="a-plus-plus">c}[wt.%], and T[K].

关键词： Oxidation decarburization carbon diffusivity effect of oxidation atmosphere Fe cr c

来源：评论

学校读者我要写书评

暂无评论

Storage of c, N, and P affected by afforestation with Salix cupularis in an alpine semiarid desert ecosystem

引用

LAND DEGRADATION & DEVELOPMENT 2018年第1期29卷 188-198页

作者： Hu, Yu-Fu Shu, Xiang-Yang He, Jia Zhang, Yu-Lin Xiao, Hai-Hua Tang, Xiao-Yan Gu, Yun-Fu Lan, Ting Xia, Jian-Guo Ling, Jing chen, Guang-Deng Wang, chang-Quan Deng, Liang-Ji Yuan, Shu Sichuan Agr Univ Coll Resources Chengdu 611130 Sichuan Peoples R China Harbin Inst Technol Shenzhen Shenzhen Key Lab Organ Pollut Prevent & Control Shenzhen 518055 Peoples R China

Few systemic assessments have evaluated the success of these afforestation programs in alpine semiarid desert ecosystems in the Qinghai-Tibet Plateau. In this study, we investigated the influences of three Salix cupularis plantation age classes (6, 18, and 34years) on the carbon (c), nitrogen (N), and phosphorus (P) storages and stoichiometry of the soil-plant ecosystem. The consequences of *** plantation induced soil spatial heterogeneity. The soil-plant ecosystem c storage increased after the plantation. The N storage showed an increasing trend from 6 to 18years and then slightly decreased. The P storage presented a continuously declining trend. The result indicated that the imbalance in soil N, P, c occurred with plantation age because of the imbalance of their inputs. The N and P uptakes from subsoil and redistribution to topsoil by *** may contribute to meet N and P demands for the understory plants. Leaf N:P ratios varied from 8.3 to 17.5. These results imply that N and P status are the main factors limiting plant growth in the alpine-cold desert ecosystem. Thus, we recommend adding N and P fertilizers during plant growth.

关键词： afforestation alpine semiarid desert soil-plant system stoichiometry c N and P storage salix plantations

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：