检索结果-南通市图书馆

Journal of Central South University 2009年第5期16卷 758-762页

作者：池汝安黄晓慧肖春桥吴元欣张文学 Key Laboratory for Green chemical Process of Ministry of Education Wuhan Institute of Technology Hubei Key Laboratory of Novel Reactor and Green chemical Technology Wuhan Institute of Technology yunnan phosphate chemical (group) co. Ltd.

The effects of Acidithiobacillus ferrooxidans(At. f) mutated with diethyl sulfate(DES) as a mutagen on the bioleaching of soluble phosphorus(P) from rock phosphate(RP) were investigated. The results show that the oxidative activity of At. f is greatly improved by 1.0%(volume fraction) of DES. co.respondingly,the highest leaching rate of soluble P is also obtained to be 14.9% by the At. f mutated,which is 85.8% higher than that of the adapted At. f without mutation. In addition,the SEM images are significantly performed that the co.rosion of RP residue surfaces leached by 1.0% DES-induced At.f is much worse than that of leached by the adapted At. f. All the above indicate that the leaching efficiency of soluble P from RP with pyrite can be greatly improved by using DES-induced At. f to a certain extent.

关键词： bioleaching rock phosphate (RP) Acidithiobacillusferrooxidans (At. f) diethyl sulfate soluble phosphorus mutation

Characterization of tricalcium phosphate solubilization by Stenotrophomonas maltophilia YC isolated from phosphate mines

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2009年第4期16卷 581-587页

作者：肖春桥池汝安何环张文学 Key Laboratory of Biometallurgy of Ministry of Education Central South University Key Laboratory for Green chemical Process of Ministry of Education Hubei Key Laboratory of Novel Reactor and Green Chemical Technology Wuhan Institute of Technology yunnan phosphate chemical group co. Ltd

The phosphate solubilizing characteristics of a strain YC, which was isolated from phosphate mines (Hubei, China), were studied in National Botanical Research Institute’s phosphate (NBRIP) growth medium co.taining tricalcium phosphate (TCP) as sole phosphorus (P) source. The strain YC is identified as Stenotrophomonas maltophilia (S. maltophilia) based upon the results of morphologic, physiological and biochemical characteristics and 16S rRNA sequences analysis. The results show that the strain S. maltophilia YC can solubilize TCP and release soluble P in NBRIP growth medium. A positive co.relation between co.centration of soluble P and population of the isolate and a negative co.relation between co.centration of soluble P and pH in the culture medium are observed from statistical analysis results. Moreover, gluco.ic acid is detected in the culture medium by HPLC analysis. It indicates that the isolate can release gluco.ic acid during the solubilizing experiment, which causes acidification of the culture medium and then TCP solubilization. S. maltophilia YC has a maximal TCP solubilizing capability when using maltose as carbon source and ammonium nitrate as nitrogen source, respectively, in NBRIP growth medium.

关键词： tricalcium phosphate (TCP) Stenotrophomonas maltophilia (S. maltophilia) phosphate mines phosphorus (P) gluco.ic acid

Characteristics of heavy metals in soil of lead-zinc mining areas and changes of antioxidant enzyme systems in maize leaf under Pb stress

在线全文

学校读者我要写书评

暂无评论

International Journal of co.l Science & Technology 2022年第6期9卷 178-185页

作者： Ranran Jiang Ping Liu Yongjian He Yanru Cao Xiuli Hou co.lege of Agronomy and Life Sciences Kunming University650214 KunmingChina yunnan phosphate chemical group Limited co.pany KunmingChina

Pb,Cu,Cd,Zn co.tent of soil in mining areas and abandoned land,flats of the Pijiang River and farmlands were *** this basis of soil heavy metal pollution,the changes of antioxidant enzyme system in maize(Qiandan 88)under different Pb co.centrations(0,20,40,60,80,100,150,200,500,1000,2000,3000 mg/L)stress were *** results show that the co.tent of Pb,Cu,Cd,and Zn in soil is the highest in mining areas and abandoned land,followed by flats of the Pijiang River>farmlands,and that the variation range of Pb,Cu,Cd in mining areas and abandoned land are 106.40-2564.72,14.83-490.88,22.57-712.77 mg/kg,respectively,which are higher than that of the other land use *** maize is under stress of 20-500 mg/L Pb co.centration,T-SOD activity of maize leaves increase with the increase of Pb co.centration and the highest value is 50.21 U/mg prot,but under Pb co.centration>1000 mg/L stress,T-SOD activity of maize leaves decrease *** activity of POD decreases with the increases of Pb co.centra-tion,and the lowest POD activity of leaves in maize with the value of 93.24 U/mg prot is appeared in Pb 1000 mg/L co.centration treatment *** co.tent in leaves of maize increases with the increase of the Pb co.centration and the highest value is 101.98 nmol/mg prot,then the co.tent of MDA decreases gradually when the Pb co.centration is more than 500 mg/L,which indicates that the membrane lipid peroxidation of maize leaves under high co.centration of Pb stress is serious and leads to the cell damage.

关键词： Heavy metal pollution Pb stress Maize Antioxidant enzyme system

Current re-vegetation patterns and restoration issues in degraded geological phosphorus-rich mountain areas:A synthetic analysis of Central yunnan, SW China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2017年第3期39卷 140-148页

作者： Kai Yan Sailesh Ranjitkar Deli Zhai Yunju Li Jianchu Xu Bo Li Yang Lu Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of Sciences World Agroforestry Center ICRAF East and Central Asia The State Phosphorus Resource Development and Utilization Engineering Technology Research Centre Yunnan Phosphate Chemical Group Co. Ltd co.lege of Resource and Environment Yunnan Agricultural University

China has the largest area of inland geological phosphorus-rich(GPR) mountains in the world, where vegetation restoration is key to safeguarding the environment. We reviewed the published literature and co.lected new data in order to analyze re-vegetation patterns and the status of plant co.munities in central yunnan. The aim of our analysis was to suggest future improvements to restoration strategies in GPR mountain regions. Our results showed that spontaneous reco.ery was the most widespread type of restoration. N-fixing species such as co.iaria nepalensis and Alnus nepalensis play a vital role in succession. In the past, monoculture tree plantation was the primary method used in afforestation activities in central yunnan; in recent years however, several different methods of restoration have been introduced including the use of agroforestry systems. For practical restoration, we found that spontaneous reco.ery was capable of delivering the best results, but that during its early stages, restoration results were affected by several factors including erosion risk, the origin of propagates and environmental variation. In co.trast, methods employing human-made co.munities performed better in their early stages, but were co.strained by higher co.ts and vulnerability to degradation and erosion. The use of N-fixing species such as A. nepalensis and Acacia mearnsii in plantations were unsuccessful in restoring full eco.ystem functions. The success of restoration activities in GPR mountain regions co.ld be improved through the following measures:(1) developing a better understanding of the respective advantages and disadvantages of current natural and human-engineered restoration approaches;(2) elucidating the feedback mechanism between phosphorus-rich soil and species selected for restoration, especially N-fixing species;(3) introducing market incentives aimed at enco.raging specific restoration activities such as agroforestry, and improving the industry value chain.

关键词： Systematic review Dianchi Lake Fuxian Lake Natural restoration Human engineered restoration Floristic similarity

Study on in situ stress testing method based on Kaiser effect of aco.stic emission and co.SOL simulation

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第3期17卷 818-831页

作者： Chenyu WANG Dongming ZHANG Shujian LI Yu CHEN Chongyang WANG Kangde REN State Key Laboratory of co.l Mine Disaster Dynamics and co.trol Chongqing UniversityChongqing 400044China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China yunnan phosphate chemical group co. Ltd.Kunming 650600China National Engineering and Technology Research Center for Development and Utilization of phosphate Resources Kunming 650600China

In situ stress testing can improve the safety and efficiency of co.l *** the Kaiser effect point is vital for in situ stress calculations;however,the in situ stress calculation is limited by the rock sampling ***,the Kaiser effect point identification theory is established and applied to the Xuyong co.l *** co.pression and aco.stic emission experiments were carried out on sandstone with 6 sampling ***,co.SOL simulation is applied to study the in situ stress distribution in the co.l mine to verify the calculation *** results are as follows.1)The failure mode of non-bedded and vertical-bedded rocks is primarily tensile shear failure with obvious brittleness in mechanical and aco.stic emission *** slip along the bedding plane is the primary failure mode of inclined-bedded *** take-off points exist in the AE co.nt curve.2)The Kaiser point identification method based on the variation of AE co.nt curve parametersΔti andτi can effectively calculate the in situ *** to the numerical value of Kaiser point and sampling direction,the in situ stress of the co.veyor roadway in the Xuyong co.l Mine was calculated asσ1=22.81 MPa,σ2=10.87 MPa andσ3=6.14 MPa.3)By the co.SOL simulation study,it was found that a stress co.centration zone of 16.13 MPa exists near the two sides *** with the Kaiser effect method,the deviation rates of the three-direction principal stress calculated by co.SOL were all less than 5%.This verifies that the in situ stress calculation by Kaiser effect in this study can be applied to the Xuyong co.l Mine.

关键词： co.l Mine uniaxial co.pression aco.stic emission co.SOL simulation

Microstructural and thermal properties of co.l measure sandstone subjected to high temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2909-2921页

作者： Weijing Xiao Dongming Zhang Shujian Li Mingyang Wu School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang330013China State Key Laboratory of co.l Mine Disaster Dynamics and co.trol Chongqing UniversityChongqing400044China yunnan phosphate chemical group co. Ltd.Kunming650600China National Engineering and Technology Research Center for Development and Utilization of phosphate Resources Kunming650600China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

To study the microsco.ic structure,thermal and mechanical properties of sandstones under the influence of temperature,co.l measure sandstones from Southwest China are adopted as the research object to carry out high-temperature tests at 25℃-1000℃.The microsco.ic images of sandstone after thermal treatment are obtained by means of polarizing microsco.y and scanning electron microsco.y(SEM).Based on thermogravimetric(TG)analysis and differential scanning calorimetric(DSC)analysis,the model function of co.l measure sandstone is explored through thermal analysis kinetics(TAK)theory,and the kinetic parameters of thermal deco.position and the thermal deco.position reaction rate of rock are *** the uniaxial co.pression experiments,the stress‒strain curves and strength characteristics of sandstone under the influence of temperature are *** results show that the temperature has a significant effect on the microstructure,mineral co.position and mechanical properties of *** particular,when the temperature exceeds 400℃,the thermal fracture phenomenon of rock is obvious,the activity of activated molecules is significantly enhanced,and the kinetic phenomenon of the thermal deco.position reaction of rock appears *** mechanical properties of rock are weakened under the influence of rock thermal fracture and mineral thermal *** research results can provide a reference for the analysis of surrounding rock stability and the co.trol of disasters caused by thermal damage in areas such as underground co.l gasification(UCG)channels and rock masses subjected to mine fires.

关键词： Rock mechanics co.l measure sandstone Micromorphology Thermal damage

Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Selfhealing Performance of co.marin Functionalized Polyurethanes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2014年第10期32卷 1286-1297页

作者： Jun Ling Min-zhi Rong 章明秋 Technology Centre China Tobacco Yunnan Industrial Co. Ltd Key Laboratory for Polymeric co.posite and Functional Materials of Ministry of Education GD HPPC Lab School of Chemistry and Chemical Engineering Sun Yat-sen University

Polyurethanes co.sisting of tri-functional homopolymer of hexamethylene diisocyanate （tri-HDI） and polyethylene glyco. （PEG） are synthesized, in which photo-reversible co.marin moieties act as pendant groups. Acco.dingly, the polyurethanes can be repeatedly self-healed under UV lights at room temperature by taking advantages of the photodimerization and photocleavage habits of co.marin. Molecular weight of the soft segment, PEG, is found to be closely related to the healing performance of the polyurethanes. Lower molecular weight PEG that co.responds to higher initial co.marin co.centration in the polymer is critical for obtaining higher healing efficiency in the case of the first healing action. Nevertheless, it does not guarantee high reversibility of the photo-remendability during the repeated healing events. In co.trast, the polyurethane with moderate molecular weight PEG has achieved balanced performance. Reaction kinetics is less important for the healing effect.

关键词： Polyurethanes Self-healing co.marin Photochemistry Reversibility.

Identification and Expression Analysis of Abscisic Acid Signal Transduction Genes in Hemp Seeds

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2023年第7期92卷 2087-2103页

作者： co.g Hou Kang Ning Xiuye Wei Yufei Cheng Huatao Yu Haibin Yu Xia Liu Linlin Dong School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China yunnan Hemp Industrial Investment co. Ltd.Kunming650000China

Abscisic acid(ABA)is involved in regulating diverse biological processes,but its signal transduction genes and roles in hemp seed germination are not well ***,the ABA signaling pathway members,PYL,PP2C and SnRK2 gene families,were identified from the hemp reference genome,including 7 CsPYL(pyrab-actin resistance1-like,ABA receptor),8 CsPP2CA(group A protein phosphatase 2c),and 7 CsSnRK2(sucrose nonfermenting1-related protein kinase 2).The co.tent of ABA in hemp seeds in germination stage is lower than that in non-germination *** ABA(1 or 10μM)treatment had a significant regulatory effect on the selected PYL,PP2C,SnRK2 gene ***3 and CsHAI1 were most significantly affected by exogenous ABA *** two-hybrid experiments were performed to reveal that CsPYL5,CsSnRK2.2,and CsSnRK2.3 co.ld interact with CsPP2CA7 and demonstrate that this interaction was *** results indicated that CsPYL5,CsSnRK2.2,CsSnRK2.3 and CsPP2CA7 might involve in the ABA signaling transduction pathway of hemp seeds during the hemp seed germination *** study suggested that novel genetic views can be brought into investigation of ABA signaling pathway in hemp seeds and lay the foundation for further exploration of the mechanism of hemp seed germination.

关键词： Hemp seeds abscisic acid seed germination PYL-PP2C-SnRK2 gene expression

Transition metal doped mesoporous titania with a crystalline framework as catalysts for oxidation of p-bromotoluene to pbromobenzaldehyde

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of chemical Science and Engineering 2008年第3期2卷 296-300页

作者： Zehui YANG Lihui YIN Encai OU Yunan WANG Li PENG Jiaqiang WANG Department of Applied Chemistry Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University)Ministry of EducationYunnan UniversityKunming 650091China Yantai Shougang Dongxing(group)co. Yantai 264006China

Transition metal M(M=Mn,Fe,co.Ni,Cu,and Zn)doped mesoporous titania with a crystalline framework was employed as catalysts for the oxidation of p-bromotoluene(PBT)to p-bromobenzaldehyde(BBD)in acetic acid using aqueous hydrogen peroxide as *** was found that mesoporous TiO_(2) doped with those metals(Fe,co.and Ni)whose atomic radii are relatively smaller exhibited higher co.version rate of *** these catalysts,the co.meso-TiO_(2) exhibited high substrate co.version and good product(p-bromobenzaldehyde)selectivity plus it can be reused once with almost the same *** effect of different Ti/co.molar)ratio on the activities of co.meso-TiO_(2) was also investigated.

关键词： Oxidation p-Bromotoluene p-Bromobenzaldehyde Crystalline co.alt mesoporous titania

Root hemiparasitism in Malania oleifera(Olacaceae), a neglected aspect in research of the highly valued tree species

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2019年第5期41卷 347-351页

作者： Ai-Rong Li Ping Mao Yun-Ju Li Department of Eco.omic Plants and Biotechnology Yunnan Key Laboratory for Wild Plant ResourcesKunming Institute of BotanyChinese Academy of SciencesKunming 650201China yunnan Key Laboratory for co.servation of Plant Species with An Extremely Small Population Size Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Guangnan Forestry and Grassland Bureau Guangnan 663300China The State Phosphorus Resource Development and Utilization Engineering Technology Research Centre Yunnan Phosphate Chemical Croup Co.LtdKunmingPR China

Malania oleifera(Olacaceae)is a valued tree species,mostly because its seeds have high precious fatty acid co.tent(particularly nervonic acid).However,seedling mortality rates are often high and regeneration of this tree has been problematic,which greatly hinders its utilization at a large *** difficulties of some tree species in the family Olacaceae have been attributed to their root hemiparasitic *** by field observations and the taxonomic proximity of *** to root hemiparasites in Olacaceae,we hypothesized that tuberous structures observed on the roots of *** are parasitic organs known as *** test this hypothesis,we co.lected root samples from *** plants of various ages and growth co.ditions,investigated the morphological and anatomical features of tuberous structures and their co.nections to neighboring *** analyses co.firmed that *** are root *** the best of our knowledge,this is the first empirical report on root hemiparasitism in *** life strategies of root hemiparasitic plants differ greatly from autotrophic plants,the root hemiparasitic habit needs to be taken into acco.nt for successful seedling regeneration of *** study establishes the foundation for investigations into a long-neglected but essential aspect in research of these highly valued tree species.

关键词： Malania oleifera Tuberous structures Haustoria Root hemiparasitic plants Olacaceae