担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.chemosphere.2024.141685

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Environmental Chemical Engineering  

Biomass-derived polymers are being increasingly utilized as eco-friendly functional materials in fields ranging from medicine and food to agriculture and environmental engineering. In this report, we developed a novel efficient method for improvement of soil materials based on in situ gelation of a polyion complex formed by biomass-derived carboxymethyl cellulose (CMC) and chitosan (CS). Self-organized network of polymer films and microfibers assembled via electrostatic interactions between oppositely-charged polyions interconnects particles of soil material and imparts the resulted composite with a considerable mechanical strength. Treatment of soil even with a high water content (ca. 30%) by a mixture of CMC and CS at m(CMC + CS)/m(soil) ratio of ca. 1% is sufficient to gain up to 150 kPa compression strength that further increases up to ca. 1 MPa after drying. Similar reinforcement effect by CMC-CS complex was observed for sand, and much higher yield strengths were measured for clay. Mechanical properties of soil materials strengthened by CMC-CS complex depended on structure and stability of CMC-CS polyion network and controlled by the polymerization degrees of macromolecules and the charge ratio between them. Being composed entirely of biomass-derived polymers, the proposed soil treatment system is particularly attractive due to environmental friendliness and sustainability and it can be utilized not only for the soil improvement but also for the construction of functional platforms for soil pollution control and remediation.

DOI： 10.1016/j.jece.2023.111676

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Waste Management  

The progressive accumulation of discarded plastic in the environment demands further development of waste management of plastic waste and conversion technologies of such waste to value-added materials. Recently, the conversion of plastic waste to functional materials via chemical recycling has attracted considerable attention. In this report, plastic waste (PET) was utilized for the preparation of a hydrogel-based catalyst via a cross-linking reaction of PET-derived oligo(terephthalamide)s followed by the electroless metallization. The polymeric matrix of PET-derived hydrogel plays multiple roles of (i) an adsorption media for noble metal ions such as Au3+ and Ag+, (ii) a reducing agent of Au3+ and Ag+ ions to Au0 and Ag0, and (iii) a matrix for the controlled growth of Au and Ag nanoparticles (AuNPs and AgNPs). The obtained hybrid hydrogels after metallization contained well-dispersed AuNPs and AgNPs of 6.1 ± 3.7 nm or 6.1 ± 1.4 nm size, respectively. The catalytic activities of the hybrid hydrogels with metal nanoparticles were studied in a model system of p-nitrophenol reduction in an aqueous solution. The hybrid materials of both Au@hydrogel and Ag@hydrogel were catalytically active for the reduction of p-nitrophenol, obeying the first-order kinetics. Importantly, the AuNPs or AgNPs in the hydrogel matrix preserved the original catalytic activity after multiple p-nitrophenol reduction reactions, showing a promising reusability of the catalysts. The proposed here approach aims to broaden the scope of conversion routes of plastic waste to value-added materials as well as to develop new types of polymeric matrices for templating and growth of metal nanoparticles for catalytic applications.

DOI： 10.1016/j.jclepro.2023.139828

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nanomaterials  

Ubiquitous on Earth DNA and other nucleic acids are being increasingly considered as promising biomass resources. Due to their unique chemical structure, which is different from that of a more common carbohydrate biomass polymers, materials based on nucleic acids may exhibit new attractive characteristics. In this study, fluorescent nanoparticles (biodots) were prepared by a hydrothermal (HT) method from various nucleic acids (DNA, RNA, nucleotides, and nucleosides) to establish the relationship between the structure of precursors and fluorescent properties of biodots and to optimize conditions for preparation of the most fluorescent product. HT treatment of nucleic acids results in decomposition of sugar moieties and depurination/depyrimidation of nucleobases, while their consequent condensation and polymerization gives fluorescent nanoparticles. Fluorescent properties of DNA and RNA biodots are drastically different from biodots synthesized from individual nucleotides. In particular, biodots synthesized from purine-containing nucleotides or nucleosides show up to 50-fold higher fluorescence compared to analogous pyrimidine-derived biodots. The polymeric nature of a precursor disfavors formation of a bright fluorescent product. The reported effect of the structure of the nucleic acid precursor on the fluorescence properties of biodots should help designing and synthesizing brighter fluorescent nanomaterials with broader specification for bioimaging, sensing, and other applications.

DOI： doi.org/10.3390/gels9110874

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Applied Catalysis B: Environmental  

We report an electrochemical approach to extract methanol from lignin with a maximum efficiency of 95% under mild conditions of ambient pressure and a temperature of 75 °C. Hydroxyl radicals were generated from water over a platinum-sputtered anode and attacked the syringyl and guaiacyl units of the lignin. Methoxy groups in the units were demethylated to methanol with a yield greater than 40% through the formation of hemiketal intermediates. The electro-oxidation was coupled to cathode reactions that generated hydrogen in a helium flow and electric power in an air flow. Another important aspect of this approach is that no extra energy or effort was required to separate methanol from the reaction system. This technology can accelerate the replacement of fossil organic resources with renewable biomass resources.

DOI： 10.1016/j.apcatb.2023.123328

Scopus

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Waste Management  

The progressive accumulation of discarded plastic in the environment demands further development of waste management of plastic waste and conversion technologies of such waste to value-added materials. Recently, the conversion of plastic waste to functional materials via chemical recycling has attracted considerable attention. In this report, plastic waste (PET) was utilized for the preparation of a hydrogel-based catalyst via a cross-linking reaction of PET-derived oligo(terephthalamide)s followed by the electroless metallization. The polymeric matrix of PET-derived hydrogel plays multiple roles of (i) an adsorption media for noble metal ions such as Au3+ and Ag+, (ii) a reducing agent of Au3+ and Ag+ ions to Au0 and Ag0, and (iii) a matrix for the controlled growth of Au and Ag nanoparticles (AuNPs and AgNPs). The obtained hybrid hydrogels after metallization contained well-dispersed AuNPs and AgNPs of 6.1 ± 3.7 nm or 6.1 ± 1.4 nm size, respectively. The catalytic activities of the hybrid hydrogels with metal nanoparticles were studied in a model system of p-nitrophenol reduction in an aqueous solution. The hybrid materials of both Au@hydrogel and Ag@hydrogel were catalytically active for the reduction of p-nitrophenol, obeying the first-order kinetics. Importantly, the AuNPs or AgNPs in the hydrogel matrix preserved the original catalytic activity after multiple p-nitrophenol reduction reactions, showing a promising reusability of the catalysts. The proposed here approach aims to broaden the scope of conversion routes of plastic waste to value-added materials as well as to develop new types of polymeric matrices for templating and growth of metal nanoparticles for catalytic applications.

DOI： 10.1016/j.wasman.2023.03.037

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Scientific Reports  

Large topologically associated domains (TADs) contain irregularly spaced nucleosome clutches, and interactions between such clutches are thought to aid the compaction of these domains. Here, we reconstituted TAD-sized chromatin fibers containing hundreds of nucleosomes on native source human and lambda-phage DNA and compared their mechanical properties at the single-molecule level with shorter ‘601’ arrays with various nucleosome repeat lengths. Fluorescent imaging showed increased compaction upon saturation of the DNA with histones and increasing magnesium concentration. Nucleosome clusters and their structural fluctuations were visualized in confined nanochannels. Force spectroscopy revealed not only similar mechanical properties of the TAD-sized fibers as shorter fibers but also large rupture events, consistent with breaking the interactions between distant clutches of nucleosomes. Though the arrays of native human DNA, lambda-phage and ‘601’ DNA featured minor differences in reconstitution yield and nucleosome stability, the fibers’ global structural and mechanical properties were similar, including the interactions between nucleosome clutches. These single-molecule experiments quantify the mechanical forces that stabilize large TAD-sized chromatin domains consisting of disordered, dynamically interacting nucleosome clutches and their effect on the condensation of large chromatin domains.

DOI： 10.1038/s41598-022-19471-3

Web of Science

Scopus

PubMed

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jece.2022.107749

DOI： doi.org/10.1016/j.jece.2022.107749

Web of Science

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Environmental Chemical Engineering  

Mass production and consequent accumulation of plastic wastes in the environment urges the development of technologies for the efficient plastic wastes utilization and valorization to materials and products to support circular economy. Here, we report a novel conversion of PET plastic to a magnetic microparticles adsorbent prepared by co-precipitation of Fe3O4 nanoparticles with oligomeric products of PET aminolysis. The obtained adsorbent represents highly water-dispersible oligo(terephthalamide) particles of several tens μm size embedding magnetic nanoparticles randomly distributed in the organic matrix. The PET-derived magnetic adsorbent was used for the rapid and facile magnetic separation of an anionic dye (Congo Red, CR) from dye simulated water samples. The adsorbent containing plenty of amine groups showed superb adsorption capacity for CR of ca. 780 mg/g which is pH dependent and optimal at pH 6.5. Furthermore, the microparticular, non-aggregative state of the adsorbent coupled with its magnetic functionality provided rapid saturation of the adsorbent with dye by ca. 70% of the equilibrium adsorption capacity within 5 min and possibility of instantaneous removal from solution by a magnet. The proposed here material design addresses simultaneously the problem of plastic wastes utilization and preparation of cost-effective and efficient adsorbents for environmental cleaning purposes.

DOI： 10.1016/j.jece.2022.108055

Web of Science

Scopus

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Environmental Chemical Engineering  

Biomass-derived polymers are being increasingly utilized as eco-friendly functional materials in fields ranging from medicine and food to agriculture and environmental engineering. In this report, we developed a novel efficient method for improvement of soil materials based on in situ gelation of a polyion complex formed by biomass-derived carboxymethyl cellulose (CMC) and chitosan (CS). Self-organized network of polymer films and microfibers assembled via electrostatic interactions between oppositely-charged polyions interconnects particles of soil material and imparts the resulted composite with a considerable mechanical strength. Treatment of soil even with a high water content (ca. 30%) by a mixture of CMC and CS at m(CMC + CS)/m(soil) ratio of ca. 1% is sufficient to gain up to 150 kPa compression strength that further increases up to ca. 1 MPa after drying. Similar reinforcement effect by CMC-CS complex was observed for sand, and much higher yield strengths were measured for clay. Mechanical properties of soil materials strengthened by CMC-CS complex depended on structure and stability of CMC-CS polyion network and controlled by the polymerization degrees of macromolecules and the charge ratio between them. Being composed entirely of biomass-derived polymers, the proposed soil treatment system is particularly attractive due to environmental friendliness and sustainability and it can be utilized not only for the soil improvement but also for the construction of functional platforms for soil pollution control and remediation.

DOI： 10.1016/j.jece.2021.107084

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Applied Polymer Materials  

It has recently been shown that native ds-DNA and chitosan can coassemble without common phase separation and precipitation, forming a translucent homogeneous hydrogel. This simple approach consists of progressive charging of the polysaccharide through gradual acidification of a solution in the presence of DNA, which slowly strengthens the electrostatic interactions between them, ruling out fast and uncontrolled cooperative association, which is a well-known problem associated with coacervation. Homogeneous hydrogels thus fabricated demonstrated mechanical properties characteristic of quite strong physical hydrogels. Extraordinary mechanical strength and elasticity have been observed in aerogels prepared from an original hydrogel and also in hydrogels, which were restored by the rehydration of aerogels. Aerogels match highly cross-linked synthetic polyurethane foams despite DNA with chitosan being bound only via electrostatic interactions without using a toxic cross-linking agent. Owing to their biocompatibility, biodegradability, and available renewable resources, hydrogels and aerogels might replace typical synthetic polymers. The fabrication of bionanocomposites with luminescent, sensing, and photocatalytic functionalities by entrapping quantum dots, titania nanoparticles, and dyes demonstrates some possible applications.

DOI： 10.1021/acsapm.1c01585

Web of Science

Scopus

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Environmental Chemical Engineering  

To ensure sustainable use of natural resources and circulation of materials, efficient methods of waste plastic conversion into value chemicals and scenarios for utilization of the latter are increasingly demanded. Here, we propose a method of waste PET bottles conversion to cross-linked hydrogels through PET aminolysis using tri- and tetraamines as a method of plastic waste valorization. Water-soluble oligomeric products of PET aminolysis were cross-linked in water using diglycidyl ether to get mechanically stable hydrogels that show typical polyelectrolyte behavior of polycations. PET-derived hydrogels abundant with amino groups and aromatic moieties were tested as adsorbents for an anionic dye such as Congo Red, and their absorption capacity towards dye was found to be ca. 500 mg/g. Beside demonstrated here application of PET-derived hydrogels for water cleaning from an industrial dye, utilization of such hydrogel materials in fields of environment, agriculture, separation, etc. are also anticipated.

DOI： 10.1016/j.jece.2021.106129

Web of Science

Scopus

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Biosensors  

Nucleic acids that exhibit a high affinity toward noble and transition metal ions have attracted growing attention in the fields of metal ion sensing, toxic metal ion removal, and the construction of functional metal nanostructures. In this study, fluorescent nanoparticles (biodots) were synthesized from DNA, RNA, and RNA nucleotides (AMP, GMP, UMP, and CMP) using a hydrothermal (HT) method, in order to study their metal ion sensing characteristics. The fluorescent properties of biodots differ markedly between those prepared from purine and pyrimidine nucle-obases. All biodots demonstrate a high sensitivity to the presence of mercury cations (Hg2+ ), while biodots prepared from DNA, RNA, and guanosine monophosphate (GMP) are also sensitive to Ag+ and Cu2+ ions, but to a lesser extent. The obtained results show that biodots inherit the metal ion recognition properties of nucleobases, while the nucleobase composition of biodot precursors affects metal ion sensitivity and selectivity. A linear response of biodot fluorescence to Hg2+ concentration in solution was observed for AMP and GMP biodots in the range 0–250 µM, which can be used for the analytic detection of mercury ion concentration. A facile paper strip test was also developed that allows visual detection of mercury ions in solutions.

DOI： 10.3390/bios11090333

Web of Science

Scopus

PubMed

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Nanomaterials  

Ubiquitous on Earth DNA and other nucleic acids are being increasingly considered as promising biomass resources. Due to their unique chemical structure, which is different from that of a more common carbohydrate biomass polymers, materials based on nucleic acids may exhibit new attractive characteristics. In this study, fluorescent nanoparticles (biodots) were prepared by a hydrothermal (HT) method from various nucleic acids (DNA, RNA, nucleotides, and nucleosides) to establish the relationship between the structure of precursors and fluorescent properties of biodots and to optimize conditions for preparation of the most fluorescent product. HT treatment of nucleic acids results in decomposition of sugar moieties and depurination/depyrimidation of nucleobases, while their consequent condensation and polymerization gives fluorescent nanoparticles. Fluorescent properties of DNA and RNA biodots are drastically different from biodots synthesized from individual nucleotides. In particular, biodots synthesized from purine-containing nucleotides or nucleosides show up to 50-fold higher fluorescence compared to analogous pyrimidine-derived biodots. The polymeric nature of a precursor disfavors formation of a bright fluorescent product. The reported effect of the structure of the nucleic acid precursor on the fluorescence properties of biodots should help designing and synthesizing brighter fluorescent nanomaterials with broader specification for bioimaging, sensing, and other applications.

DOI： 10.3390/nano11092265

Web of Science

Scopus

PubMed

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Applied Bio Materials  

DOI： 10.3390/gels7030112

DOI： 10.3390/gels7030112

Scopus

その他リンク： https://www.mdpi.com/2310-2861/7/3/112/pdf

担当区分：最終著者,　責任著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Applied Bio Materials  

DOI： 10.1021/acsabm.0c01533

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Biophysical Journal  

DOI： 10.1016/j.bpj.2020.10.018

Web of Science

Scopus

PubMed

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Soft Matter  

DOI： 10.1039/d0sm00162g

Web of Science

Scopus

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Biophysical Journal  

DOI： 10.1016/j.bpj.2019.04.010

Web of Science

Scopus

PubMed

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00396-018-4432-6

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Hazardous Materials  

DOI： 10.1016/j.jhazmat.2018.08.067

Scopus

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ACS Omega  

DOI： 10.1021/acsomega.8b02865

Web of Science

Scopus

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.cej.2018.03.115

Web of Science

Scopus

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.chemosphere.2018.07.037

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.bpj.2018.04.012

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：CELL PRESS  

DOI： 10.1016/j.bpj.2017.11.3273

Web of Science

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/C7EW00283A

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1093/nar/gkx1135

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.matlet.2017.09.091

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1134/S1811238217010155

Web of Science

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11356-017-9213-0

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.langmuir.7b00448

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.5004/dwt.2017.20824

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/cnma.201600012

Web of Science

担当区分：筆頭著者   記述言語：英語  

DOI： 10.1016/j.cis.2016.02.005

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1246/cl.160180

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1063/1.4950749

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11051-016-3480-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.mencom.2016.07.007

記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：大学等環境安全協議会  

大学の教育研究活動に伴って生じる廃棄物の削減と再利用・資源化を進めるために、2009年度から2012年度の４年間に、名古屋大学から不要試薬として排出処分された化学物質廃棄物中に含まれていた貴金属またはレアメタルからなる未使用化学物質の実体について、排出記録と回収現場の調査に基づき研究した。明らかになった名古屋大学の現状を基に、有害物質の分別、リユースを基本とした化学物質廃棄物の削減と有効利用、研究費の無駄使いにつながる試薬購入の問題点について考察した。さらに、改善方法の例として化学物質ストック情報の共有、希少元素ライブラリーの創設、有価物としての売却について提案した。

DOI： 10.11162/daikankyo.15g1101

CiNii Research

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/masy.201500062

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

CiNii Research

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

本論文では、材料科学や環境科学など生命科学以外の分野でもDNAの高次構造制御の有用性を示した。水産廃棄物から調製された安価なDNAが重金属と形成した不溶な安定錯体を形成するとこにより、重金属を除去する方法を開発した。

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fluorescence microscopic observation on individual T4 DNA molecules revealed that MukBEF complex (bacterial condensin) and its subunit MukB (a member of SMC superfamily) homodimer of Escherichia coli shrunk markedly large DNA molecules in the presence of hydrolysable ATP. Contrary, in the presence of ADP or ATP-γS, the conformation of DNA was almost not changed. This suggests that the ATPase activity of subunit MukB is essential to shrink large DNA molecules. Stretching experiment on the shrunken DNA in the presence of ATP and MukBEF indicated cross bridging interaction between DNA molecules.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

We have shown that upon UV irradiation of silver(I) ion solutions containing alcohol as reduction agents, metal nanoparticles are grown on a DNA polymer chain. This metallization is independent of the DNA double-helicity and is controlled by the chemical structure of alcohol as well as by the wavelength of the light source.

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語  

担当区分：筆頭著者   記述言語：英語  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Fluorescence microscopy is used for visualizing the release of double-stranded DNA from its interpolyelectrolyte complex with positively charged poly(allylamine hydrochloride) though exchange reaction with added polyanion, poly(sodium styrenesulfonate). The switching of pathway of DNA release is due to the screening of electrostatic repulsion in charged sequences of naked DNA and the decrease of the osmotic pressure of counterions.

記述言語：英語   掲載種別：研究論文（学術雑誌）  

The compaction of long duplex DNA by cationic nanoparticles (NP) used as a primary model of histone core particles has been investigated. We have systematically studied the effect of salt concentration, particle size, and particle charge by means of single-molecule observations-fluorescence microscopy (FM) and transmission electron microscopy (TEM)-and molecular dynamics (MD) simulations. We have found that the large-scale DNA compaction is progressive and proceeds through the formation of beads-on-a-string structures of various morphologies. The DNA adsorbed amount per particle depends weakly on NP concentration but increases significantly with an increase in particle size and is optimal at an intermediate salt concentration. Three different complexation mechanisms have been identified depending on the correlation between DNA and NPs in terms of geometry, chain rigidity, and electrostatic interactions: free DNA adsorption onto NP surface, DNA wrapping around NP, and NP collection on DNA chain.

担当区分：筆頭著者   記述言語：英語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

本研究成果は、DNA による極めて選択的な不斉分子識別能力を示しただけでなく、DNAの折り畳み／解きほぐしに基づくオン／オフ転移を異なる凝縮剤の添加で制御できることおよび、分子デザインを用いて凝縮剤とDNA との様々なタイプの分子間相互作用を独立して制御できる可能性を実証した点で高く評価された。

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

開催年月日： 2023年8月 - 2023年9月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：プラハ   国名：チェコ共和国  

その他リンク： http://isp2023.com/home/#invitation

開催年月日： 2023年5月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：ドレスデン   国名：ドイツ連邦共和国  

開催年月日： 2022年8月

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開催地：オンライン   国名：アメリカ合衆国  

開催年月日： 2021年12月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：アメリカ合衆国  

開催年月日： 2021年11月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年6月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2021年3月

記述言語：日本語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2020年11月

記述言語：英語   会議種別：ポスター発表  

国名：日本国  

開催年月日： 2020年3月

記述言語：英語   会議種別：ポスター発表  

国名：日本国  

開催年月日： 2019年11月

記述言語：英語   会議種別：口頭発表（招待・特別）  

開催地：Okinawa, Japan   国名：日本国  

開催年月日： 2018年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2018年3月

記述言語：英語   会議種別：口頭発表（一般）  

国名：シンガポール共和国  

開催年月日： 2016年6月 - 2016年7月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：ロシア連邦  

開催年月日： 2011年12月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：日本国  

開催年月日： 2011年6月

記述言語：日本語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2009年11月

記述言語：日本語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2009年9月

記述言語：英語   会議種別：ポスター発表  

開催年月日： 2009年3月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2008年11月

記述言語：英語   会議種別：口頭発表（一般）  

開催年月日： 2008年6月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2008年1月

記述言語：英語   会議種別：口頭発表（一般）  

DOI： 10.1109/ICBBE.2008.714

Scopus

開催年月日： 2007年11月

記述言語：英語   会議種別：口頭発表（招待・特別）  

Zinchenko Anatoly

開催年月日： 2006年3月

記述言語：英語   会議種別：口頭発表（一般）  

開催年月日： 2005年6月

記述言語：英語   会議種別：口頭発表（招待・特別）  

記述言語：英語   会議種別：口頭発表（招待・特別）  

開催地：Okinawa, Japan  

記述言語：英語   会議種別：口頭発表（一般）  

記述言語：英語   会議種別：口頭発表（招待・特別）  

記述言語：英語   会議種別：ポスター発表  

記述言語：日本語   会議種別：口頭発表（一般）  

記述言語：英語   会議種別：口頭発表（一般）  

記述言語：英語   会議種別：口頭発表（招待・特別）  

記述言語：英語   会議種別：ポスター発表  

開催地：東京理科大学 野田キャンパス  

記述言語：英語   会議種別：口頭発表（一般）