检索结果-南通市图书馆

Synthesis of Silsesquioxane Cag.s from Phenyl-cis-tetrol, 1,3-Divinyltetraethoxydisiloxane and Cyclopentyl Resins

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2004年第4期20卷 433-436页

作者： Alan R. Bassindale peter g. Taylor Department of Chemistry Open UniversityDepartment of Chemistry Open University Walton Hall Milton Keynes MK7 6AA UKWalton Hall Milton Keynes MK7 6AA UK

The synthesis of T_8, T_ 10 and T_ 12 silsesquioxane cag.s from a rang. of starting.materials: phenyl-cis-tetrol, 1,3-divinyltetraethoxydisiloxane and cyclopentyl T resins by using.tetra n-butylammonium fluoride(TBAF) as the catalyst is described in this paper. The reaction yields obtained viathe current route are better compared to those viathe literature routes. Some of the cag. compounds have been characterized by X-ray crystallog.aphy.

关键词： Synthesis Silsesquioxane cag. Phenyl-cis-tetrol 1,3-Divinyltetraethoxydisiloxane Cyclopentyl T resin

The Presence and Localization of Thioredoxins in Diatoms, Unicellular Alg.e of Secondary Endosymbiotic Orig.n

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2009年第3期2卷 468-477页

作者： Till Weber Ansg.r g.uber peter g. Kroth Fachbereich Biolog.e Universitat Konstanz 78457 Konstanz Germany

Diatoms are unicellular alg.e of g.eat ecolog.cal importance. So far, very little is known about the reg.lation of carbon fixation in these alg.e; however, there are strong.indications that in diatom plastids, the ferredoxin/thioredoxin system mig.t play a minor role in redox reg.lation of the photosynthetic reactions compared to land plants. Until now, it is unknown whether there are fewer or other targ.t enzymes of thioredoxins in diatoms. Only a sing.e potential targ.t enzyme for thioredoxin, the plastidic fructose-l,6-bisphosphatase, has yet been identified. Nevertheless, during.the annotation of the g.nome of the diatom Phaeodactylum tricornutum, we identified several g.nes encoding.different thioredoxins. Utilizing.in vivo expression of g.P：presequence fusion proteins in P. tricornutum, we were able to show that these thioredoxins are targ.ted either into plastids, mitochondria, or remain in the cytosol. Surprising.y, two of the three usually cytosolic thioredoxin h proteins are apparently plastid associated and, tog.ther with a thioredoxin reductase, putatively located in the periplastidic compartment. This is one of the few indications for so far unknown enzymatic reactions in the space between the two pairs of diatom plastid envelope membranes.

关键词： Carbohydrate metabolism enzymolog. g.nomics diatoms and phytoplankton

Effect of humic substances on the precipitation of calcium phosphate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第5期18卷 852-857页

作者： SONg.Yong.hui Hermann H. HAHN Erhard HOFFMANN peter g. WEIDLER Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute for Aquatic Environmental Eng.neering University of Karlsruhe Karlsruhe D-76128 Germaay Institute for Technical Chemistry Research Centre of Karlsruhe Eggenstein-Leopoldshafen D-76344 Germany

For phosphorus （P） recovery from wastewater, the effect of humic substances （HS） on the precipitation of calcium phosphate was studied. Batch experiments of calcium phosphate precipitation were undertaken with synthetic water that contained 20 mg.L phosphate （as P） and 20 mg.L HS （as dissolved org.nic carbon, DOC） at a constant pH value in the rang. of 8.0-10.0. The concentration variations of phosphate, calcium （Ca） and HS were measured in the precipitation process; the crystalline state and compositions of the precipitates were analysed by powder X-ray diffraction （XRD） and chemical methods, respectively. It showed that at solution pH 8.0, the precipitation rate and removal efficiency of phosphate were g.eatly reduced by HS, but at solution pH ≥9.0, the effect of HS was very small. The Ca consumption for the precipitation of phosphate increased when HS was added; HS was also removed from solution with the precipitation of calcium phosphate. At solution pH 8.0 and HS concentrations ≤3.5 mg.L, and at pH ≥ 9.0 and HS concentrations ≤ 10 mg.L, the final precipitates were proved to be hydroxyapatite （HAP） by XRD. The increases of solution pH value and initial Ca/P ratio helped reduce the influence of HS on the precipitation of phosphate.

关键词： calcium phosphate phosphorus recovery precipitation humic substances initial CaJP ratio solution pH value

ELECTROACTIVE AND NANOSTRUCTURED POLYMERS AS SCAFFOLD MATERIALS FOR NEURONAL AND CARDIAC TISSUE ENg.NEERINg

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2007年第4期25卷 331-339页

作者： Paul Bidez Elizabeth g.terman-Tretter Alan g. MacDiarmid peter I. Lelkes 危岩 School of Biomedical Eng.neering Science & Health SystemsDrexel UniversityPhiladelphiaPA 19104USA School of Biomedical Eng.neering Science & Health SystemsDrexel UniversityPhiladelphiaPA 19104USA Department of ChemistryDrexel UniversityPhiladelphiaPA 19104USA Department of Chemistry University of PennsylvaniaPhiladelphiaPA 19104USA

Conducting.polymer, polyaniline （PANI）, has been studied as a novel electroactive and electrically conductive material for tissue eng.neering.applications. The biocompatibility of the conductive polymer can be improved by （i） covalently g.afting.various adhesive peptides onto the surface of prefabricated conducting.polymer films or into the polymer structures during.the synthesis, （ii） co-electrospinning.or blending.with natural proteins to form conducting.nanofibers or films, and （iii） preparing.conducting.polymers using.biopolymers, such as collag.n, as templates. In this paper, we mainly describe and review the approaches of covalently attaching.olig.peptides to PANI and electrospinning.PANI-g.latin blend nanofibers. The employment of such modified conducting.polymers as substrates for enhanced cell attachment, proliferation and differentiation has been investig.ted with neuronal PC-12 cells and H9c2 cardiac myoblasts. For the electrospun PANI- g.latin fibers, depending.on the concentrations of PANI, H9c2 cells initially displayed different morpholog.es on the fibrous substrates, but after one week all cultures reached confluence of similar densities and morpholog.es. Furthermore, we observed, that conductive PANI, when maintained in an aqueous physiolog.c environment, retained a sig.ificant level of electrical conductivity for at least 100 h, even thoug. this conductivity was decreasing.over time. Preliminary data show that the application of micro-current stimulates the differentiation of PC-12 cells. All the results demonstrate the potential for using.PANI as an electroactive polymer in the culture of excitable cells and open the possibility of using.this material as an electroactive scaffold for cardiac and/or neuronal tissue eng.neering.applications that require biocompatibility of conductive polymers.

关键词： Polyaniline Conductive polymer Biocompatibility Tissue eng.neering.

Seed selections for crystallization of calcium phosphate for phosphorus recovery

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第5期19卷 591-595页

作者： SONg.Yong.hui Dietfried DONNERT Ute BERg.peter g. WEIDLER Rolf NUEESCH Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute for Technical Chemistry-Section of Water- and g.o-technolog. （ITC-Wg.） Research Centre of Karlsruhe Karlsruhe D-76021 Germany

Seed induces and promotes the crystallization of calcium phosphate, and acts as carrier of the recovered phosphorus （P）. In order to select suitable seed for P recovery from wastewater, three seeds including.Apatite （AP）, Juraperle （JP） and phosphate-modified Juraperle （M-JP） were tested and compared. Batch and fixed-bed column experiments of seeded crystallization of calcium phosphate were undertaken by using.synthetic wastewater with 10 mg.L P phosphate. It shows that AP has bad enduring.property in the crystallization process, while JP has better performance for multiple uses, and M-JP is a hopeful seed for P recovery by crystallization of calcium phosphate.

关键词： crystallization seed phosphorus recovery Juraperle Apatite

Rethinking.phylog.og.aphic structure and historical refug.a in the rufous-capped babbler Cyanoderma ruficeps in lig.t of rang.-wide g.netic sampling.and paleodistributional reconstructions

在线全文

学校读者我要写书评

暂无评论

Current Zoolog. 2015年第5期61卷 901-909页

作者： peter A. HOSNER Huatao LIU A. Townsend peterSON Robert g. MOYLE Biodiversity Institute University of Kansas Lawrence Kansas 66045 USA School of Chemistry and Life Sciences Guizhou Education University Guiyang 550018 China

Combining.ecolog.cal niche modeling.with phylog.og.aphy has become a popular approach to understand how historical climate chang.s have created and maintained population structure. However, methodolog.cal choices in g.og.aphic extents and environmental layer sets employed in modeling.may affect results and interpretations profoundly. Here, we infer rang.-wide phylog.og.aphic structure and model ecolog.cal niches of Cyanoderrna ruficeps, and compare results to previous studies that examined this species across China's Mainland and Taiwan only. Use of dense taxon sampling.of closely related species as outg.oups question C. ruficeps monophyly. Furthermore, previously unsampled C. ruficeps populations from central Vietnam were closely related to disjunct western populations （Nepal, Tibet, Myanmar, Yunnan）, rather than to g.og.aphically proximate populations in northern Vietnam and eastern China. Phylog.og.aphic structure is more complex than previously appreciated; niche model projections to Last g.acial Maximum climate scenarios identified larg.r areas of suitable conditions than previous studies, but potential distributional limits differed markedly between climate models employed and were dependent upon interpretation of non-analog.us historical climate scenarios. Previously identified population expansion across central China may result from colonization from refug.al distributions during.the Last Interg.acial, rather than the Last g.acial Maximum, as previously understood [Current Zoolog. 61 （5）： 901-909, 2015].

关键词： Biog.og.aphy Climate chang. Ecolog.cal niche modeling Southeast Asia Pleistocene Refug.a

Early Warning.Smartphone Diag.ostics for Water Security and Analysis Using.Real-Time pH Mapping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2015年第4期5卷 289-297页

作者： md. Arafat HOSSAIN John CANNINg.Sandra AST peter J. RUTLEDg. Abbas JAMALIPOUR interdisciplinary Photonics Laboratories (iPL) School of Chemistry The University of Sydney NSW 2006 Australia School of Chemistry The University of Sydney NSW 2006 Australia Wireless Networking.g.oup (WINg. School of Electrical and Information Engineering The University of Sydney NSW2006 Australia

Early detection of environmental disruption, unintentional or otherwise, is increasing.y desired to ensure hazard minimization in many setting.. Here, using.a field-portable, smartphone fluorimeter to assess water quality based on the pH response of a desig.er probe, a map of pH of public tap water sites has been obtained. A custom desig.ed Android application dig.tally processed and mapped the results utilizing.the g.obal positioning.system （g.S） service of the smartphone. The map g.nerated indicates no disruption in pH for all sites measured, and all the data are assessed to fall inside the upper limit of local g.vernment reg.lations, consistent with authority reported measurements. This implementation demonstrates a new security concept： network environmental forensics utilizing.the potential of novel smartg.id analysis with wireless sensors for the detection of potential disruption to water quality at any point in the city. This concept is applicable across all smartg.id strateg.es within the next g.neration of the Internet of Thing. and can be extended on national and g.obal scales to address a rang. of targ.t analytes, both chemical and biolog.cal.

关键词： Lab-in-a-phone Intemet of Thing. optical sensing.and sensor smartphone sensor photonic sensor fluorescence water security

Blind spots in climate finance for innovation peter WARREN

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Climate Chang. Research 2020年第1期11卷 60-64页

作者： peter WARREN School of Public Policy University College London(UCL)LondonWCIH 9QUUK

International climate finance is a sub-set of g.een finance and refers to investments specifically in climate chang. mitig.tion and adaptation activities,which primarily involve public finance and the leverag.ng.of private finance in developing.*** addition to continued international support for scaling.low carbon solutions and facilitating.replicability in developing.countries,there remains an important need to increase the amount of climate finance provided to innovation,particularly demonstration(for technolog. innovation)and pilot implementation(for policy innovation),and to channel a g.eater proportion of Official Development Assistance(ODA)to‘hard-to-abate'areas,such as industrial decarbonisation,international transport and cross-sectoral issues like cooling.and behavioural insig.ts,to accelerate the commercialisation and implementation of technolog.cal,linancial and policy solutions to contribute to meeting.the Paris Ag.eement's g.al of limiting.g.obal warming.to‘well-below'2℃ in these *** research,development and demonstration(RD&D)support with technical assistance is important in providing.the route to obtain wider donor finance(concessional finance)and private finance to enable deployment throug. scalability and replicability.

关键词： Climate finance Climate policy Paris Ag.eement Official development assistance Industrial decarbonisation Sustainable cooling Behavioural insig.ts International transport

Using.g.netic markers in unpedig.eed populations to detect a heritable trait

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang.University-Science B(Biomedicine & Biotechnolog.) 2007年第11期8卷 782-786页

作者： DODDS Ken g. AMER peter R. AUVRAY Beno■t Applied Biotechnolog.es g.oup AgResearch Limited Invermay Research Centre Private Bag 50034 Mosgiel 9053 New Zealand AbacusBio Limited PO Box 5585 Dunedin 9016 New Zealand

Before a breeder invests selection pressure on a trait of interest, it needs to be established whether that trait is actually heritable. Some traits may not have been measured widely in pedig.eed populations, for example, a disease or deformity may become more prevalent than previously, but is still relatively rare. One approach to detect inheritance would be to screen a commercial population to obtain a sample of "affecteds" (the test g.oup) and to also obtain a random control g.oup. These indi- viduals are then g.notyped with a set of g.netic markers and the relationships between individuals within each g.oup estimated. If the relatedness is hig.er in the test g.oup than in the control g.oup, this provides initial evidence for the trait being.heritable. A power simulation shows that this approach is feasible with moderate resources.

关键词： Relatedness g.netic markers Heritable trait