检索结果-南通市图书馆

Observations of defect propagation in [100]-oriented opal-type photonic crystals

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 Physics B 2008年第4期17卷 1298-1304页

作者：金崇君 Richard M.De La Rue nigel P.Johnson Department of Electronics & Electrical Engineering University of Glasgow School of Physics and Engineering Laboratory of Optoelectronic Materials and TechnologiesSun Yat-Sen University

Charged colloidal suspensions have been used as experimental models for the study of crystal nucleation. Here we propose that the technique of template-assisted colloidal self-assembly can be used to visualize the effects of defect propagation in atomic crystal films produced using epitaxial growth. Templates with periodic line defects were used to grow [100]-oriented three-dimensional photonic crystals by means of the template-assisted colloidal self-assembly method, aided by capillary and gravitational forces. The defect propagation in the [100]-oriented photonic crystal was observed using scanning electron microscopy, both at the surface of the crystal and on cleaved facets. This method is useful in the understanding of defect propagation in the growth of colloidal films on templates - and the same approach may also prove useful for the understanding of atomic crystal growth on substrates with defects. Additionally, the deliberate incorporation of line defects may prove valuable as a way of introducing waveguide channels into three-dimensional photonic crystals.

关键词： photonic crystal colloidal crystal self-assembly

A living foundry for Synthetic Biological Materials:A synthetic biology roadmap to new advanced materials

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthetic and Systems Biotechnology 2018年第2期3卷 105-112页

作者： Rosalind A.Le Feuvre nigel S.Scrutton BBSRC/EPSRC Manchester Centre for Synthetic Biology of Fine and Speciality Chemicals(SYNBIOCHEM) Manchester Institute of BiotechnologyThe University of ManchesterManchester M17DNUnited Kingdom School of Chemistry The University of ManchesterManchester M17DNUnited Kingdom

Society is on the cusp of harnessing recent advances in synthetic biology to discover new bio-based products and routes to their affordable and sustainable *** is no more evident than in the discovery and manufacture of Synthetic Biological Materials,where synthetic biology has the capacity to usher in a new Materials from Biology era that will revolutionise the discovery and manufacture of innovative synthetic biological *** will encompass novel,smart,functionalised and hybrid materials for diverse applications whose discovery and routes to bio-production will be stimulated by the fusion of new technologies positioned across physical,digital and biological *** article,which developed from an international workshop held in Manchester,United Kingdom,in 2017[1],sets out to identify opportunities in the new materials from biology *** considers requirements,early understanding and foresight of the challenges faced in delivering a Discovery to Manufacturing Pipeline for synthetic biological materials using synthetic biology *** challenge spans the complete production cycle from intelligent and predictive design,fabrication,evaluation and production of synthetic biological materials to new ways of bringing these products to *** opportunities are identified that will help foster expertise sharing and infrastructure development to accelerate the delivery of a new generation of synthetic biological materials and the leveraging of existing investments in synthetic biology and advanced materials research to achieve this goal.

关键词： Synthetic biology Materials Biological materials Biomaterials Advanced materials

Experimental Study on the Mobility of Channelized Granular Mass Flow

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第3期90卷 988-998页

作者： ZHOU Gongdan nigel G.WRIGHT SUN Qicheng CAI Qipeng Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences & Ministry of Water Conservancy School of Civil Engineering University of Leeds State Key Laboratory for Hydroscience and Engineering Tsinghua University College of Civil Engineering Huaqiao University

Granular mass flows （e.g., debris flows/avalanches） in landslide-prone areas are of great concern because they often cause catastrophic disasters as a result of their long run-out distances and large impact forces. To investigate the factors influencing granular mass flow mobility, experimental tests were conducted in a flume model. Granular materials consisting of homogeneous sand and non- homogeneous sandy soil were used for studying particle size effects. Run-out tests with variable flow masses, water contents, and sloping channel confinement parameters were conducted as well. The results indicated that granular mass flow mobility was significantly influenced by the initial water content; a critical water content corresponding to the smallest flow mobility exists for different granular materials. An increase in the total flow mass generally induced a reduction in the travel angle （an increase in flow mobility）. Consistent with field observations, the travel angles for different granular materials decreased roughly in proportion to the logarithm of mass. The flume model tests illustrate that the measured travel angles increase as the proportion of fine particles increases. Interestingly, natural terrain possesses critical confinement characteristics for different granular mass flows.

关键词： granular mass flow mobility water content flow mass fine particle channel confinement

Endocrine correlates of gender and throat coloration in the southern ground-hornbill(Bucorvus leadbeateri)

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2021年第2期16卷 189-201页

作者： Juan SCHEUN Sophie NELLER nigel CBENNETT Lucy VKEMP Andre GANSWINDT Department of Life and Consumer Sciences University of South AfricaSouth Africa Biodiversity Research Services National Zoological GardensSouth Africa Mammal Research Institute Department of Zoology and EntomologyFaculty of Natural and Agricultural SciencesUniversity of PretoriaPretoriaSouth Africa Mabula Ground Hornbill Project/IUCN Hornbill Specialist Group Bela-BelaSouth Africa Department of Applied Behavioural Ecology&Ecosystem Research University of South AfricaSouth Africa Endocrine Research Laboratory Department of Anatomy&PhysiologyFaculty of Veterinary ScienceUniversity of PretoriaSouth Africa

The southern ground-hornbill(SGH)is a cooperatively breeding bird endemic to eastern and southern Africa,but is endangered in its southern distributional *** national conservation restoration program harvests redundant chicks for captive breeding and reintroduction;with sexing and social grouping of the species evaluated by throat-skin coloration,with adult males displaying a completely red color compared to dark blue within the red observed in adult ***,recent findings indicate that dominant and subordinate adult males exhibit patches of blue *** optimize SGH management practices,it is vital to determine the role of red and blue coloration,as well as the possible drivers *** a prerequisite,an enzyme immunoassay for monitoring fecal androgen metabolite(fAM)concentrations in SGH was *** this,fresh fecal samples were collected from 78 SGH,of various demographics and origin,across 12 captive institutions,to determine whether fAM concentrations differ between blue(B),partially blue(sB),and fully red(R)throat-skin colored ***,fAM concentrations were compared between males housed in different social groups of different age and sex *** median fAM concentrations of B,sB,and R adult males did not differ significantly but were considerably higher in B and sB males compared to R *** dynamics within captivity,for example,dominance,played no role as a driver of male gonadal activity or throat skin *** results of the study indicate that androgens and apparent social dynamics are not primary determinants of throat coloration in male SGH.

关键词： coloration fecal glucocorticoid metabolites non-invasive southern ground-hornbill validation

Natural history of hepatic metastases from colorectal cancer-pathobiological pathways with clinical significance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第14期20卷 3719-3737页

作者： Konstantinos A Paschos Ali W Majeed nigel C Bird Liver Research Group Department of OncologySchool of MedicineRoyal Hallamshire HospitalThe University of Sheffield Department of Surgery General Hospital of Drama

Colorectal cancer hepatic metastases represent the final stage of a multi-step biological *** process starts with a series of mutations in colonic epithelial cells,continues with their detachment from the large intestine,dissemination through the blood and/or lymphatic circulation,attachment to the hepatic sinusoids and interactions with the sinusoidal cells,such as sinusoidal endothelial cells,Kupffer cells,stellate cells and pit *** metastatic sequence terminates with colorectal cancer cell invasion,adaptation and colonisation of the hepatic *** these events,termed the colorectal cancer invasion-metastasis cascade,include multiple molecular pathways,intercellular interactions and expression of a plethora of chemokines and growth factors,and adhesion molecules,such as the selectins,the integrins or the cadherins,as well as enzymes including matrix *** review aims to present recent advances that provide insights into these cell-biological events and emphasizes those that may be amenable to therapeutic targeting.

关键词： Colorectal cancer Metastatic cascade Liver metastasis Liver sinusoids Neovascularization

Truffle-like fungi sporocarps in a eucalypt-dominated landscape: patterns in diversity and community structure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fungal Diversity 2013年第1期58卷 143-157页

作者： Melissa Danks Teresa Lebel Karl Vernes nigel Andrew Ecosystem Management University of New EnglandArmidaleNew South Wales 2351Australia National Herbarium of Victoria Royal Botanic Gardens MelbourneSouth YarraVictoria 3141Australia Centre for Behavioural and Physiological Ecology ZoologyUniversity of New EnglandArmidaleNew South Wales 2351Australia

Truffle-like fungi are highly diverse yet poorly known in *** assess the species richness,biomass,and community assemblages of truffle-like fungi in different habitats we sampled sporocarps of truffle-like fungi in three eucalypt-dominated forest types(grassy woodland,wet sclerophyll forest,and dry sclerophyll forest)once in summer and once in winter,at two sites(Mount Kaputar and New England)in northern New South Wales,*** hundred and eighteen species in 35 genera were collected;over half(51.7%)of the species were *** woodland and wet forest communities had greater species richness and a lower standing crop than dry forest *** richness and standing crop was greater in winter than in ***,species from the family Russulaceae,and the genera Dermocybe,Descomyces,and Hysterangium were *** composition varied among forest types and each forest type exhibited a suite of unique and common species,although much variation was *** in community structure was associated with some habitat attributes;at Mount Kaputar,woody plant species richness,canopy cover,litter depth,soil phosphorous,and elevation helped explain the sporocarp communities of different forest types,while at New England,woody plant species richness,rainfall,topographic aspect,soil texture,and soil nitrogen helped explain *** work contributes to knowledge of trufflelike fungal diversity,the factors affecting sporocarp distribution across landscapes,and the availability of sporocarps as a food resource for mycophagous *** understanding of fungal diversity and mammal-fungal interactions also has important implications for managing forest biodiversity.

关键词： Basidiomycetes Biodiversity Forest ecology Fungal diversity Mycorrhizal fungi Sequestrate fungi

From source to emplacement:The origin of leucogranites from the Sikkim-Darjeeling Himalayas,India

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第1期15卷 384-401页

作者： Tanya Srivastava nigel Harris Catherine Mottram Kumar Batuk Joshi Nishchal Wanjari Department of Geology Sikkim UniversityGangtokIndia School of Environment Earth&Ecosystem SciencesOpen UniversityMiltonKeynesUK School of the Environment Geography and GeosciencesUniversity of PortsmouthUK National Centre for Earth Science Studies ThiruvananthapuramKeralaIndia

Himalayan leucogranites are important for understanding the tectonic evolution of collision zones in general and the causes of crustal melting in the Himalayan orogen in *** paper aims to understand the melt source and emplacement age of the leucogranites from Sikkim in order to decipher the deep geodynamic processes of the eastern *** U-Pb analysis of the Higher Himalayan Sequence(HHS)metamorphic core reveals a prolonged period of crustal melting between>33 Ma and ca.14 *** and trace element abundances are presented for 27 leucogranites from North Sikkim that are classified into two-mica and tourmaline leucogranite *** are peraluminous in composition,characterized by high SiO2(70.91-74.9 wt.%),Al2O3(13.69-15.82 wt.%),and low MgO(0.13-0.74 wt.%).Elemental abundances suggest that Sikkim Himalayan leucogranites are derived from crustal *** two-mica leucogranites are derived from a metagreywacke source,whereas the tourmaline leucogranites are sourced from metapelitic sources,with inherited zircons indicating an HHS origin for both types.U-Pb zircon geochronology of the two mica leucogranites indicates ages of ca.19-15 Ma,consistent with crustal melting recorded in HHS gneisses from *** from both the two-mica and tourmaline leucogranites yield a crystallization age of ca.15-14 Ma,coeval with movement on the Main Central Thrust and South Tibetan Detachment System which further provides constraints on the timing and mechanism of petrogenesis of leucogranites in the Sikkim Himalayas.

关键词： Leucogranites Gneiss U-Pb geochronology Zircon Monazite Sikkim-Darjeeling Himalayas

Liver resection for the treatment of a congenital intrahepatic portosystemic venous shunt

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2016年第3期15卷 329-333页

作者： michail papamichail amir ali alberto quaglia john karani nigel heaton Department of Hepatobiliary Pancreatic Surgery First Affiliated Hospital:King's Healthcare PartnersKing's College Hos-pital FT NHS Trust Institute of Liver Studies Denmark HillLondon SE5 9RSUK

Intrahepatic portosystemic shtmts （IPSS） are rare congenital anomalies arising from disordered portal vein em- bryogenesis. It has been described in both children and adults and may be asymptomatic or be associated with a variety of neurophysiological and pulmonary complications. When rec- ognized, early intervention to occlude the shunt will reverse the associated complications. Literature review reports of surgical and radiological occlusion of the shunt, but due to its rarity, a standard therapeutic protocol has not been established. A case of a 38-year-old woman with abdominal pain and low grade encephalopathy, diagnosed with an IPSS and treated by right hepatectomy was reported.

关键词： intrahepatic portosystemic shunt liver resection

Understanding development and ripening of fruit crops in an‘omics’ era

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2014年第1期1卷 157-166页

作者： nigel E Gapper James J Giovannoni Christopher B Watkins Department of Horticulture Cornell UniversityIthacaNY 14853USA Boyce Thompson Institute for Plant Research Cornell UniversityIthacaNY 14853USA Plant Soiland Nutrition LaboratoryUS Department of Agriculture/Agriculture Research ServiceIthacaNY 14853USA

Next generation sequencing has revolutionized plant *** only has our understanding of plant metabolism advanced using model systems and modern chromatography,but application of‘omics’-based technology has been widely extended to non-model systems as costs have plummeted and efficiency *** a result,important fundamental questions relating to important horticultural crops are being answered,and novel approaches with application to industry are in *** we review recent research advances on development and ripening of fruit crops,how next generation sequencing approaches are driving this advance and the emerging future landscape.

关键词： crops driving metabolism