检索结果-南通市图书馆

Science China chemistry 2018年第11期61卷 1349-1350页

作者： Shingo Ito division of chemistry and biological chemistry School of Physical and Mathematical Sciences Nanyang Technological University

Coordination-insertion copolymerization of non-polar ole- fins and polar monomers by late transition metal catalysts is a powerful method to synthesize functionalized polyolefins [1]. Seminal successes in this copolymerization have been achieved by using group-10 metal catalysts bearing a bidentate ligand such as phosphine-sulfonate and bisphosphine monoxide （BPMO）（Figure 1）.

关键词：金属催化剂梁结构镍氧化物

gem-Difluorinative 1,2-azide migration of vinyl azides enables an expedient synthesis of β-difluoroalkyl azides

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2020年第8期63卷 1019-1020页

作者： Jia Hao Pang Shunsuke Chiba division of chemistry and biological chemistry School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Organic azides have shown versatile reactivity to induce various organic transformations for the synthesis of nitrogencontaining organic molecules such as 1,3-dipolar cycloadditions with unsaturated bonds,the Curtius rearrangement,and formation of nitrogen-centered radicals,most of which are driven by the entropic loss of molecular dinitrogen[1].

关键词： azide synthesis enable

Nanozymes:Versatile Platforms for Cancer Diagnosis and Therapy

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2022年第6期14卷 165-191页

作者： Xiaodong Zhang Xiaokai Chen Yanli Zhao division of chemistry and biological chemistry School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore

Natural enzymes usually suffer from high production cost,ease of denaturation and inactivation,and low yield,making them difficult to be broadly *** an emerging type of artificial enzyme,nanozymes that combine the characteristics of nanomaterials and enzymes are promising *** the one hand,nanozymes have high enzyme-like catalytic activities to regulate biochemical *** the other hand,nanozymes also inherit the properties of nanomaterials,which can ameliorate the shortcomings of natural enzymes and serve as versatile platforms for diverse *** this review,various nanozymes that mimic the catalytic activity of different enzymes are *** achievements of nanozymes in different cancer diagnosis and treatment technologies are summarized by highlighting the advantages of nanozymes in these ***,future research directions in this rapidly developing field are outlooked.

关键词： Cancer theranostics Catalytic therapy Enzyme mimics Nanozymes Smart nanomedicine

Determination and assessment of total mercury levels in local, frozen and canned fish in Lebanon

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第9期23卷 1564-1569页

作者： Pierre J Obeid Bilal El-Khoury Joanne Burger Samer Aouad Mira Younis Amal Aoun John Hanna El-Nakat University of Balamand Faculty of SciencesDepartment of Chemistry Nelson biological Laboratory Division of Life SciencesRutgers University

Fish is an important constituent of the Lebanese ***,very little attention in our area is given to bring awareness regarding the effect of the toxicity of mercury （Hg） mainly through fish *** study aimed to report analytical data on total mercury levels in several fish species for the first time in thirty years and to also made individuals aware of the presence and danger from exposure to mercury through fish *** samples were selected from local Lebanese markets and fisheries and included 94 samples of which were fresh,frozen,processed,and canned *** values were reported as microgram of mercury per gram of fish based on wet *** level of mercury ranged from 0.0190 to 0.5700 μg/g in fresh samples,0.0059 to 0.0665 μg/g in frozen samples,and 0.0305 to 0.1190 μg/g in canned *** data clearly showed that higher levels of mercury were detected in local fresh fish as opposed to other types thus placing consumers at higher risk from mercury ***,the data revealed that Mallifa （yellowstripe barracuda/Sphyraena chrysotaenia）,Sargous （white seabream/Diplodus sargus）,Ghobbos （bogue/Boops boops）,and shrimp （Penaeus sp.） were among the types containing the highest amounts of *** the other hand,processed fish such as fish fillet,fish burger,small shrimp and crab are found to contain lower levels of mercury and are associated with lower exposure risks to *** population should therefore,be aware to consume limited amounts of fresh local fish to minimize exposure to mercury.

关键词： total mercury fish Lebanon

Zinc Porphyrin Sensitizers Containing Different Withdrawing and Donating Groups for Dye-sensitized Solar Cells： Design, Synthesis and Photovoltaic Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 2018年第4期37卷 589-602页

作者：宋俊玲陆瑞峰李安 School of Chemical & Material Engineering Jiangnan University division of chemistry and biological chemistry School of Physical & Mathematical SciencesNanyang Technological University

In this work, a series of unsymmetrical push-pull type zinc-porphyrins, in whichmeso-substituted porphyrin core bears an electron-donating group and an electron-withdrawinggroup in the trans positions, have been designed and synthesized to improve the light-harvesting indye-sensitized solar cells （DSSCs）. The electronic structures of these zinc-porphyrin dyes werefirstly screened by using density functional theory （DFT） and time-dependent density functionaltheory （TDDFT） calculations. Among these zinc-porphyrin derivatives, zinc porphyrins bearing aphenyl, diphenyl-benzenamine or 3-nitro-benzoic acid substituent, denoted 1）1, 1）2 or 1）3,respectively, are found to exhibit superior HOMO and LUMO locations which are suitable forDSSCs systems. In particular, the η value of the DSSCs （D2） improved up to 2.3 times whencompared with reference cell （D1） on account of the increase of Jsc, FF and Voc. The enhancement ofcell performance arises from the effective charge separation and decreases the aggregation ofporphyrin dyes.

关键词： aggregation charge separation density functional theory donor-bridge-acceptor

Identification and expression profiling of putative odorant-binding proteins in the malaria mosquitoes, Anopheles gambiae and A. arabiensis

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2004年第6期47卷 567-576页

作者： LI Zhengxi1,Jing-Jiang ZHOU2,SHEN Zuorui1 & Lin FIELD2 1.Department of Entomology,China Agricultural Univeristy,Beijing 100094,China 2.biological chemistry division, Rothamsted Research,Harpenden, Herts. AL5 2JQ, UK Correspondence should be addressed to Li Zhengxi Department of Entomology China Agricultural University Beijing China biological chemistry division Rothamsted Research Harpenden UK

Olfaction plays a major role in host-seeking behaviour of mosquitoes. An informat- ics-based genome-wide analysis of odorant-binding protein (OBP) homologues is under- taken, and 32 putative OBP genes in total in the whole genome sequences of Anopheles gam- biae are identified. Tissue-specific expression patterns of all A. gambiae OBP candidates are determined by semi-quantitative Reverse Transcription (RT)-PCR using mosquito actin gene a internal expression control standard. The results showed that 20 OBP candidates had strong expression in mosquito olfactory tissues (female antennae), which indicate that OBPs may play an important role in regulating mosquito olfactory behaviours. Species-specific expression pat- terns of all putative anopheline OBPs are also studied in two of the most important malaria vec- tors in A. gambiae complex, i.e. A. gambiae and A. arabiensis, which found 12 of the putative OBP genes examined displayed species-differential expression patterns. The cumulative relative expression intensity of the OBPs in A. arabiensis antennae was higher than that in A. gambiae (the ratio is 1441.45:1314.12), which might be due to their different host preference behaviour. While A. gambiae is a highly anthropophilic mosquito, A. arabiensis is more opportunistic (Vary- ing from anthropophilic to zoophilic). So the latter should need more OBPs to support its host selection preference. Identification of mosquito OBPs and verification of their tissue- and spe- cies-specific expression patterns represent the first step towards further molecular analysis of mosquito olfactory mechanism, such as recombinant expression and ligand identification.

关键词： odorant binding protein, A. gambiae, A. arabiensis, olfaction, semi-quantitative RT-PCR.

S-Shaped Fused Azacorannulene Dimer:Structural and Redox Properties

在线全文

学校读者我要写书评

暂无评论

CCS chemistry 2023年第5期5卷 1108-1117页

作者： Weifan Wang Fiona Hanindita Richard D.Webster Shingo Ito division of chemistry and biological chemistry School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371

Because of their unique structural and chemical properties,buckybowl molecules have attracted considerable attention in a wide range of scientific *** importance and utility of buckybowl molecules significantly increases once they acquire largerπ-surface area and/or *** fusion of buckybowl molecules has emerged as a new strategy to extend theπ-surface of polycyclic aromatic compounds;however,theπ-extension of heteroatom-embedded buckybowls by the fusion strategy is still *** we report the synthesis and propeties of a fused azacorannulene dimer bearing a C62N2 core(1a),which can also be regarded as a double aza[5]*** to the steric repulsion between two azapentabenzocorannulene moieties,this molecule shows a rigid S-shaped structure where the two azacorannulene bowls face in opposite *** chemical oxidation of 1a resulted in the formation of the corresponding radical cation(1a^(+))and dication(1a^(2+)),providing an important insight into their *** fusion of heteroatom-embedded buckybowls provides a powerful way to synthesizeπ-extended polycyclic aromatic molecules.

关键词： azacorannulenes buckybowl dimer redox chemistry structure elucidation cycloadditions

Pulsed Corona Discharges and Their Applications in Toxic VOCs Abatement

维普期刊数据库评论

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 Chemical Engineering 1999年第4期7卷 351-362页

作者： Muhammad Arif Malik Salman Akbar Malik Applied chemistry division PINSTECHPO NiloreIslamabadPakistanDepartment of Biological SciencesQuaid-i-Azam UniversityIslamabadPakistan

Plasma processes are among the emerging technologies for volatile organic compounds (VOCs) abatement[1]. Both thermal plasmas and non-equilibrium plasmas (cold plasmas) are being developed for VOCs cleanup[2,3]. Particularly, pulsed corona discharges offer several advantages over conventional VOCs abatement techniques[4-7]. To optimize the existing technology and to develop it further, there is need to understand the mechanisms involved in plasma chemical reactions. Furthermore, it is strongly desirable to be able to predict the behavior of new VOCs in non-equilibrium plasma environment from the data known for a few representative compounds. Pulsed corona discharge technique is introduced here with citation of relevant literature. Fundamental principles, useful for predicting the VOCs' decomposition behavior, have been worked out from the published literature. Latest developments in the area, targeted to minimize the energy losses, improve the VOCs destruction efficiency and reduce the generation of unwanted organic and inorganic by-products, are presented.

关键词： corona discharges volatile organic compounds air purification water purification nonequilibrium plasma

Five-dimensional tracking of single nanoparticles in living cells

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2018年第1期7卷 911-912页

作者： Xiangzhao Ai Bengang Xing division of chemistry and biological chemistry School of Physical&Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

An innovative approach to achieve dynamic fivedimensional tracking of single nanoparticles under simple microscopic inspection by human eyes was presented;this approach provided an effective means to investigate the c... 详细信息

关键词： dimensional innovative inspection

Recent advancements in 2D nanomaterials for cancer therapy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China chemistry 2018年第10期61卷 1214-1226页

作者： Menghuan Li Zhong Luo Yanli Zhao division of chemistry and biological chemistry School of Physical and Mathematical Sciences Nanyang Technological University College of Life Science Chongqing University School of Materials Science and Engineering Nanyang Technological University

Since mechanical exfoliation of graphene in 2004, unprecedented scientific and technological advances have been achieved in the development of two-dimensional(2 D) nanomaterials. These 2 D nanomaterials exhibit various unique mechanical, physical and chemical properties on account of their ultrathin thickness, which are highly desirable for many applications such as catalysis, optoelectronics, energy storage/conversion, as well as disease diagnosis and therapeutics. In this review, we summarized recent progress on the design and fabrication of functional 2 D nanomaterials capable of being applied for the cancer treatment including drug delivery, photodynamic therapy, and photothermal therapy. Their anticancer mechanisms were discussed in detail, and the related safety concerns were analyzed based on current research developments. This review is expected to provide an insight in the field of 2 D nanostructured materials for anticancer applications.

关键词： 2D nanomaterials cancer therapy drug delivery photodynamic therapy photothermal therapy