16 results on '"Futao Yu"'
Search Results
2. Selective Separation of Fluorite, Barite and Calcite with Valonea Extract and Sodium Fluosilicate as Depressants
- Author
-
Zijie Ren, Futao Yu, Huimin Gao, Zhijie Chen, Yongjun Peng, and Lingyun Liu
- Subjects
fluorite ,barite ,calcite ,valonea extract ,sodium fluosilicate ,Mineralogy ,QE351-399.2 - Abstract
Fluorite, barite and calcite are important industry minerals. However, they often co-exist, presenting difficulty in selectively separating them due to their similar surface properties. In this study, valonea extract and sodium fluosilicate were used as depressants to selectively separate them by flotation, with sodium oleate as the collector. The single mineral flotation results showed that valonea extract displayed the strongest depression on calcite, while sodium fluosilicate displayed the strongest depression on barite. These two depressants allowed selective separation of the three minerals through sequential flotation. The flotation of mixed minerals showed that 94% of the calcite was successfully depressed by the valonea extract, and 95% recovery of the fluorite was achieved in the subsequent flotation with sodium fluosilicate depressing barite. The different depressant–mineral interactions were investigated via electro-kinetic studies and molecular dynamics (MD) simulations using the Materials Studio 6.0 program. The valonea extract exhibited the strongest adsorption on the calcite surface, and sodium fluosilicate exhibited the strongest adsorption on the barite surface, which prevented oleate species from reacting with Ca2+ or Ba2+ surface sites. This study provides useful guidance for how to process fluorite, barite and calcite resources.
- Published
- 2017
- Full Text
- View/download PDF
3. Facile preparation of sulfhydryl modified montmorillonite nanosheets hydrogel and its enhancement for Pb(II) adsorption
- Author
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Weijun Peng, Yiheng Miao, Luping Chang, Yijun Cao, Guixia Fan, and Futao Yu
- Subjects
Environmental Engineering ,Scanning electron microscope ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,chemistry.chemical_compound ,Adsorption ,Specific surface area ,Spectroscopy, Fourier Transform Infrared ,Zeta potential ,Environmental Chemistry ,Fourier transform infrared spectroscopy ,0105 earth and related environmental sciences ,Ion exchange ,Public Health, Environmental and Occupational Health ,Hydrogels ,General Medicine ,General Chemistry ,Hydrogen-Ion Concentration ,Pollution ,020801 environmental engineering ,Thermogravimetry ,Kinetics ,Montmorillonite ,chemistry ,Lead ,Bentonite ,Water Pollutants, Chemical ,Nuclear chemistry - Abstract
In the work, sulfhydryl functionalized montmorillonite nanosheets based hydrogel balls were firstly synthesized for Pb(II) adsorption, and then characterized by scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), surface area analyzer (BET), thermogravimetry (TG), and zeta potential. Effects of initial solution pH, adsorbent dosage, contact time, temperature on Pb(II) adsorption of the resulting hydrogel balls were investigated systematically. The experimental results showed that the increase amount of sulfhydryl functionalized montmorillonite nanosheets (MMTNs-SH) maintained the hydrogel balls a better porous structure and bigger specific surface area, endowing it a bigger adsorption capacity. The adsorption process was fitted well with pseudo-second-order kinetics model and Freundlich model, and more than 97% of Pb(II) could be removed under the optimum conditions. Moreover, hydrogel spheres have a certain cycle performance. In addition, the interactions between Pb(Ⅱ) ions and the oxygen atoms in the hydroxyl groups and the sulfur atoms in the sulfhydryl groups, and the ion exchange in MMTNs-SH dominated the adsorption.
- Published
- 2020
4. Enhanced capacitive deionization of defect-containing MoS2/graphene composites through introducing appropriate MoS2 defect
- Author
-
Futao Yu, Weijun Peng, Yukun Huang, Wei Wang, Mengyao Qi, and Yiheng Miao
- Subjects
Materials science ,Graphene ,Capacitive deionization ,General Chemical Engineering ,Oxide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Desalination ,0104 chemical sciences ,law.invention ,Contact angle ,chemistry.chemical_compound ,chemistry ,law ,Electrode ,Zeta potential ,Composite material ,0210 nano-technology - Abstract
Defect-containing MoS2/ reduced graphene oxide (rGO) composites were moderately prepared via chemical etching. The effects of MoS2 defect on the structure, electrochemical and desalination performance of the defect-containing MoS2/rGO composites were comparatively researched. The results showed that the defect-containing MoS2/rGO composite chemical etched with 5.0 g NaBH4 (dMSG-5) exhibited the advantages of the fewest amount of (002) interplanar layers, the smallest water contact angle and zeta potential, and the most amount of exposed edge sites. etc., which endowed it with the largest specific capacity (305.6 F/g at 1.0 A/g), the lowest interfacial charge transfer resistance and the best CDI performance with the biggest desalination capacity of 25.47 mg/g at the voltage of 0.8 V in 200 mg/L NaCl solution. The results suggested that appropriate MoS2 defect indeed could enhance the electrochemical and desalination performance of dMSG-5 via providing more adsorption sites for Na+ insertion/extraction and ion diffusion channels, and improving the ion accessibility and transport efficiency. Those pave the way for construction of other high-performance electrode materials and making dMSG-5 attractive to the electrode of CDI device.
- Published
- 2021
5. Selective separation of fluorite, barite and calcite with valonea extract and sodium fluosilicate as depressants
- Author
-
Zhijie Chen, Lingyun Liu, Huimin Gao, Futao Yu, Yongjun Peng, and Zijie Ren
- Subjects
lcsh:QE351-399.2 ,Mineral flotation ,Inorganic chemistry ,02 engineering and technology ,Fluorite ,020501 mining & metallurgy ,chemistry.chemical_compound ,Adsorption ,fluorite ,Sodium fluosilicate ,Calcite ,barite ,calcite ,valonea extract ,sodium fluosilicate ,0403 Geology, 0502 Environmental Science and Management, 0914 Resources Engineering and Extractive Metallurgy ,lcsh:Mineralogy ,Geology ,021001 nanoscience & nanotechnology ,Geotechnical Engineering and Engineering Geology ,0205 materials engineering ,chemistry ,Sodium oleate ,0210 nano-technology - Abstract
Fluorite, barite and calcite are important industry minerals. However, they often co-exist, presenting difficulty in selectively separating them due to their similar surface properties. In this study, valonea extract and sodium fluosilicate were used as depressants to selectively separate them by flotation, with sodium oleate as the collector. The single mineral flotation results showed that valonea extract displayed the strongest depression on calcite, while sodium fluosilicate displayed the strongest depression on barite. These two depressants allowed selective separation of the three minerals through sequential flotation. The flotation of mixed minerals showed that 94% of the calcite was successfully depressed by the valonea extract, and 95% recovery of the fluorite was achieved in the subsequent flotation with sodium fluosilicate depressing barite. The different depressant–mineral interactions were investigated via electro-kinetic studies and molecular dynamics (MD) simulations using the Materials Studio 6.0 program. The valonea extract exhibited the strongest adsorption on the calcite surface, and sodium fluosilicate exhibited the strongest adsorption on the barite surface, which prevented oleate species from reacting with Ca2+ or Ba2+ surface sites. This study provides useful guidance for how to process fluorite, barite and calcite resources.
- Published
- 2017
6. Molecular basis of dihydrouridine formation on tRNA
- Author
-
Akiyoshi Nakamura, Min Yao, Nagisa Hirano, Isao Tanaka, Keitaro Yamashita, Futao Yu, Tsutomu Suzuki, Yoshikazu Tanaka, and Takeo Suzuki
- Subjects
Models, Molecular ,Flavin Mononucleotide ,Stereochemistry ,protein-tRNA complex ,Molecular Sequence Data ,Flavin mononucleotide ,Crystallography, X-Ray ,Protein Structure, Secondary ,chemistry.chemical_compound ,Protein structure ,Bacterial Proteins ,RNA, Transfer ,Amino Acid Sequence ,Uracil ,Uridine ,X-ray crystallography ,Binding Sites ,Multidisciplinary ,Base Sequence ,Sequence Homology, Amino Acid ,biology ,Thermus thermophilus ,substrate recognition ,Active site ,RNA ,Biological Sciences ,biology.organism_classification ,RNA modification ,Protein Structure, Tertiary ,chemistry ,Biochemistry ,Mutation ,Transfer RNA ,Biocatalysis ,biology.protein ,Nucleic Acid Conformation ,Electrophoresis, Polyacrylamide Gel ,Dihydrouridine ,Oxidoreductases ,Oxidation-Reduction ,Protein Binding - Abstract
Dihydrouridine (D) is a highly conserved modified base found in tRNAs from all domains of life. Dihydrouridine synthase (Dus) catalyzes the D formation of tRNA through reduction of uracil base with flavin mononucleotide (FMN) as a cofactor. Here, we report the crystal structures of Thermus thermophilus Dus ( Tth Dus), which is responsible for D formation at positions 20 and 20a, in complex with tRNA and with a short fragment of tRNA (D-loop). Dus interacts extensively with the D-arm and recognizes the elbow region composed of the kissing loop interaction between T- and D-loops in tRNA, pulling U20 into the catalytic center for reduction. Although distortion of the D-loop structure was observed upon binding of Dus to tRNA, the canonical D-loop/T-loop interaction was maintained. These results were consistent with the observation that Dus preferentially recognizes modified rather than unmodified tRNAs, indicating that Dus introduces D20 by monitoring the complete L-shaped structure of tRNAs. In the active site, U20 is stacked on the isoalloxazine ring of FMN, and C5 of the U20 uracil ring is covalently cross linked to the thiol group of Cys93, implying a catalytic mechanism of D20 formation. In addition, the involvement of a cofactor molecule in uracil ring recognition was proposed. Based on a series of mutation analyses, we propose a molecular basis of tRNA recognition and D formation catalyzed by Dus.
- Published
- 2011
7. Investigation of Acrylic Acid Polymerization in Novel Two-Dimensional Molecular Space with Regular Amino Groups of Layered Aminopropylsilica
- Author
-
and Ying Fu, Ken Yao, Liyi Shi, Qingdong Zhong, Futao Yu, Wen Wan, and Xiaoqing You
- Subjects
Nanocomposite ,Materials science ,Polymer nanocomposite ,General Chemical Engineering ,Polyacrylamide ,General Chemistry ,chemistry.chemical_compound ,chemistry ,Polymerization ,Amide ,Polymer chemistry ,Monolayer ,Materials Chemistry ,Layer (electronics) ,Acrylic acid - Abstract
Acrylic acid was used to investigate the capabilities of novel two-dimensional molecular space with regular amino groups (layered aminopropylsilica, ATMS-DS) on influencing and controlling molecular reaction processes. The acrylic acid was regularly fixed in the layer structure of layered aminopropylsilica through the formation of amide between carboxyl of acrylic acid and amino groups of layered aminopropylsilica. The acrylic acid regularly fixed in layered aminopropylsilica was completely polymerized to form a novel organic-inorganic nanocomposite material named as layered polyacryl-amidepropylsilica (ATMS-PAA) with monolayers of polyacrylamide in layer space of layered aminopropylsilica without initiator after being heated at 100 °C for 24 h. It was found that the polymerization of acrylic acid was facilitated in the novel two-dimensional molecular space with regular amino groups compared with free space. The polymeric structure of ATMS-PAA was also found to be decided by the regular structure of layered aminopropylsilica. The novel two-dimensional molecular space with regular amino groups in structure showed a potential of influencing and controlling molecular reaction processes. The formation of a novel hybrid organic-inorganic nanocomposite material (layered polyacrylamidepropylsilica) is also interesting for the research of polymer nanocomposite materials.
- Published
- 2007
8. An enzymatic [4+2] cyclization cascade creates the pentacyclic core of pyrroindomycins
- Author
-
Peng Sun, Yan Yan, Shuaixiang Zhou, Xinying Jia, Wen Liu, Zhuhua Wu, Qingfei Zheng, Attila Mándi, Hua Zhang, Dandan Chen, Zhenhua Tian, Futao Yu, and Tibor Kurtán
- Subjects
DNA, Bacterial ,Stereochemistry ,Cyclohexene ,Stereoisomerism ,Alkenes ,Catalysis ,chemistry.chemical_compound ,Természettudományok ,Cyclohexenes ,Molecule ,Intramolecular Lyases ,Kémiai tudományok ,Molecular Biology ,chemistry.chemical_classification ,Biological Products ,Molecular Structure ,Alkene ,Cell Biology ,Pyrrolidinones ,Recombinant Proteins ,Streptomyces ,Cycloaddition ,Chemistry ,Enzyme ,Models, Chemical ,chemistry ,Cyclization ,Mutation ,Stereoselectivity ,Macrolides ,Natural Products Chemistry ,Plasmids - Abstract
The [4+2] cycloaddition remains one of the most intriguing transformations in synthetic and natural products chemistry. In nature, however, there are remarkably few enzymes known to have this activity. We herein report an unprecedented enzymatic [4+2] cyclization cascade that has a central role in the biosynthesis of pyrroindomycins, which are pentacyclic spirotetramate natural products. Beginning with a linear intermediate that contains two pairs of 1,3-diene and alkene groups, the dedicated cyclases PyrE3 and PyrI4 act in tandem to catalyze the formation of two cyclohexene rings in the dialkyldecalin system and the tetramate spiro-conjugate of the molecules. The two cyclizations are completely enzyme dependent and proceed in a regio- and stereoselective manner to establish the enantiomerically pure pentacyclic core. Analysis of a related spirotetronate pathway confirms that homologs are functionally exchangeable, establishing the generality of these findings and explaining how nature creates diverse active molecules with similar rigid scaffolds.
- Published
- 2015
9. Spiroketal formation and modification in avermectin biosynthesis involves a dual activity of AveC
- Author
-
Qunfei Zhao, Qinglin Zhang, Zhuhua Wu, Yan Wang, Peng Sun, Yinyan Wang, Futao Yu, Wen Liu, and Hua Zhang
- Subjects
Models, Molecular ,Biological Products ,Ivermectin ,biology ,Molecular Structure ,Chemistry ,Stereochemistry ,General Chemistry ,Crystallography, X-Ray ,Biochemistry ,Catalysis ,chemistry.chemical_compound ,Polyketide ,Colloid and Surface Chemistry ,Stereospecificity ,Biosynthesis ,Biosynthetic process ,Dehydratase ,Polyketide synthase ,Mutation ,biology.protein ,Stereoselectivity ,Spiro Compounds ,Avermectin - Abstract
Avermectins (AVEs), which are widely used for the treatment of agricultural parasitic diseases, belong to a family of 6,6-spiroketal moiety-containing, macrolide natural products. AVE biosynthesis is known to employ a type I polyketide synthase (PKS) system to assemble the molecular skeleton for further functionalization. It remains unknown how and when spiroketal formation proceeds, particularly regarding the role of AveC, a unique protein in the pathway that shares no sequence homology to any enzyme of known function. Here, we report the unprecedented, dual function of AveC by correlating its activity with spiroketal formation and modification during the AVE biosynthetic process. The findings in this study were supported by characterizing extremely unstable intermediates, products and their spontaneous derivative products from the simplified chemical profile and by comparative analysis of in vitro biotransformations and in vivo complementations mediated by AveC and MeiC (the counterpart in biosynthesizing the naturally occurring, AVE-like meilingmycins). AveC catalyzes the stereospecific spiroketalization of a dihydroxy-ketone polyketide intermediate and the optional dehydration to determine the regiospecific saturation characteristics of spiroketal diversity. These reactions take place between the closures of the hexene ring and 16-membered macrolide and the formation of the hexahydrobenzofuran unit. MeiC can replace the spirocyclase activity of AveC, but it lacks the independent dehydratase activity. Elucidation of the generality and specificity of AveC-type proteins allows for the rationalization of previously published results that were not completely understood, suggesting that enzyme-mediated spiroketal formation was initially underestimated, but is, in fact, widespread in nature for the control of stereoselectivity.
- Published
- 2013
10. Crystallization and preliminary X-ray crystallographic analysis of dihydrouridine synthase from Thermus thermophilus and its complex with tRNA
- Author
-
Shiho Yamamoto, Nagisa Hirano, Futao Yu, Min Yao, Akiyoshi Nakamura, Shunsuke Kita, Isao Tanaka, and Yoshikazu Tanaka
- Subjects
Biophysics ,Crystallography, X-Ray ,Biochemistry ,law.invention ,chemistry.chemical_compound ,RNA, Transfer ,Structural Biology ,law ,Genetics ,Crystallization ,biology ,Thermus thermophilus ,Resolution (electron density) ,RNA ,Space group ,Condensed Matter Physics ,biology.organism_classification ,Crystallography ,chemistry ,Crystallization Communications ,Transfer RNA ,X-ray crystallography ,Dihydrouridine ,Oxidoreductases - Abstract
Dihydrouridine synthase (Dus) is responsible for catalyzing dihydrouridine formation in RNA by the reduction of uridine. To elucidate its RNA-recognition mechanism, Dus from Thermus thermophilus (TthDus) and its complex with tRNA were crystallized. Diffraction data sets were collected from crystals of native and selenomethionine-substituted TthDus to resolutions of 1.70 and 2.30 Å, respectively. These crystals belonged to space group P1. Preliminary X-ray crystallographic analysis showed that two molecules of TthDus were contained in an asymmetric unit. In addition, diffraction data were collected to 3.51 Å resolution from a crystal of selenomethionine-substituted TthDus in complex with tRNA, which belonged to space group P4(1)2(1)2. Preliminary structural analysis showed that the asymmetric unit contained two TthDus-tRNA complexes.
- Published
- 2011
11. Two-dimensional molecular space with regular molecular structure
- Author
-
Wen Wan, Jianming Chen, Xiaoqing You, Futao Yu, Ken Yao, and Liyi Shi
- Subjects
Butylamine ,Stereochemistry ,Reactive intermediate ,Alcohol ,Surfaces and Interfaces ,Condensed Matter Physics ,Space (mathematics) ,Grafting ,Organic molecules ,chemistry.chemical_compound ,chemistry ,Reagent ,Polymer chemistry ,Electrochemistry ,Molecule ,General Materials Science ,Spectroscopy - Abstract
A novel two-dimensional molecular space (layered carboxylpropylamidephenylsilica, CPAPhS) with regular carboxyl groups was successfully synthesized through grafting carboxyl groups in the structure of layered (aminophenyl)silica using butanedioic anhydride. The carboxyl groups regularly arranged in the layered CPAPhS can react with various organic molecules with amino and hydroxyl groups through formation of reactive intermediate with catalyzers, such as SOCl2. In this research, an example was used to prove the reaction properties of regular carboxyl groups in layered CPAPhS. The layered CPAPhS was reacted with SOCl2 to form layered acyl chloridepropylamidephenylsilica (ACPAPhS) and then reacted with n-butylamine and n-butyl alcohol to form layered n-butylamidepropylamidephenylsilica (BAPAPhS) and n-butylesterpropylamidephenylsilica (BEPAPhS) with regular molecular structures. Layered CPAPhS showed the potential as a starting material for formation of a series of novel two-dimensional molecular space with various regular molecular structures, and as a solid acceptor for chemical reagent with amino and hydroxyl groups for chemical processes.
- Published
- 2007
12. Reactive two-dimensional layered material with regular chlorine groups
- Author
-
Xiaoqing You, Wen Wan, Ken Yao, Futao Yu, Ying Fu, and Liyi Shi
- Subjects
Substitution reaction ,Inorganic chemistry ,chemistry.chemical_element ,Grafting ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Functional importance ,Functional group ,Polymer chemistry ,polycyclic compounds ,Chlorine ,Chloroacetamide ,Layer (electronics) - Abstract
A novel reactive layered two-dimensional molecular space material [layered chloroacetamide phenyl silica (CAAPhS)] with regular chlorine groups was synthesized by grafting chlorine groups into the layer structure of layered aminophenyl silica. The reactive activity of chlorine groups regularly arranged in the layer structure of layered CAAPhS was confirmed through a substitution reaction with n-butylamine. Layered CAAPhS showed potential as a starting material for the formation of a series of two-dimensional layered materials with various regular functional molecules and organic-inorganic composite materials.
- Published
- 2007
13. Spiroketal Formation and Modification in Avermectin Biosynthesis Involves a Dual Activity of AveC.
- Author
-
Peng Sun, Qunfei Zhao, Futao Yu, Hua Zhang, Zhuhua Wu, Yinyan Wang, Yan Wang, Qinglin Zhang, and Wen Liu
- Published
- 2013
- Full Text
- View/download PDF
14. Molecular basis of dihydrouridine formation on tRNA.
- Author
-
Futao Yu, Tanaka, Yoshikazu, Yamashita, Keitaro, Suzuki, Takeo, Nakamura, Akiyoshi, Hirano, Nagisa, Suzuki, Tsutomu, Min Yao, and Tanaka, Isao
- Subjects
- *
TRANSFER RNA , *URACIL , *FLAVINS , *CRYSTAL structure , *GENETIC mutation - Abstract
Dihydrouridine (D) is a highly conserved modified base found in tRNAs from all domains of life. Dihydrouridine synthase (Dus) catalyzes the D formation of tRNA through reduction of uracil base with flavin mononucleotide (FMN) as a cofactor. Here, we report the crystal structures of Thermus thermophilus Dus (TthDus), which is responsible for D formation at positions 20 and 20a, in complex with tRNA and with a short fragment of tRNA (D-loop). Dus interacts extensively with the D-arm and recognizes the elbow region composed of the kissing loop interaction between T- and D-loops in tRNA, pulling U20 into the catalytic center for reduction. Although distortion of the D-loop structure was observed upon binding of Dus to tRNA, the canonical D-loop/T-loop interaction was maintained. These results were consistent with the observation that Dus preferentially recognizes modified rather than unmodified tRNAs, indicating that Dus introduces D20 by monitoring the complete L-shaped structure of tRNAs. In the active site, U20 is stacked on the isoalloxazine ring of FMN, and C5 of the U20 uracil ring is covalently cross linked to the thiol group of Cys93, implying a catalytic mechanism of D20 formation. In addition, the involvement of a cofactor molecule in uracil ring recognition was proposed. Based on a series of mutation analyses, we propose a molecular basis of tRNA recognition and D formation catalyzed by Dus. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
15. Two-Dimensional Molecular Space with Regular Molecular Structure.
- Author
-
Ken Yao, Xiaoqing You, Liyi Shi, Wen Wan, Futao Yu, and Jianming Chen
- Published
- 2008
- Full Text
- View/download PDF
16. Investigation of Acrylic Acid Polymerization in Novel Two-Dimensional Molecular Space with Regular Amino Groups of Layered Aminopropylsilica.
- Author
-
Futao Yu, Ken Yao, Liyi Shi, Wen Wan, Qingdong Zhong, Ying Fu, and Xiaoqing You
- Subjects
- *
ACRYLIC acid , *AMINO group , *POLYACRYLAMIDE , *POLYMERIZATION - Abstract
Acrylic acid was used to investigate the capabilities of novel two-dimensional molecular space with regular amino groups (layered aminopropylsilica, ATMS-DS) on influencing and controlling molecular reaction processes. The acrylic acid was regularly fixed in the layer structure of layered aminopropylsilica through the formation of amide between carboxyl of acrylic acid and amino groups of layered aminopropylsilica. The acrylic acid regularly fixed in layered aminopropylsilica was completely polymerized to form a novel organic−inorganic nanocomposite material named as layered polyacrylamidepropylsilica (ATMS-PAA) with monolayers of polyacrylamide in layer space of layered aminopropylsilica without initiator after being heated at 100 °C for 24 h. It was found that the polymerization of acrylic acid was facilitated in the novel two-dimensional molecular space with regular amino groups compared with free space. The polymeric structure of ATMS-PAA was also found to be decided by the regular structure of layered aminopropylsilica. The novel two-dimensional molecular space with regular amino groups in structure showed a potential of influencing and controlling molecular reaction processes. The formation of a novel hybrid organic−inorganic nanocomposite material (layered polyacrylamidepropylsilica) is also interesting for the research of polymer nanocomposite materials. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
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