检索结果-南通市图书馆

A New Oviraptorid Dinosaur (theropoda: Oviraptorosauria) from the late Cretaceous of Jiangxi Province, Southern China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第4期87卷 899-904页

作者： WEI Xuefang PU Hanyong XU li lIU Di lü Junchang Institute of Geology Chinese Academy of Geological Sciences Henan Geological Museum

A new oviraptorid dinosaur Jiangxisaurus ganzhouensis gen. et sp. nov., is erected based on a partial skeleton from the Upper Cretaceous Nanxiong Formation of Ganzhou City, Jiangxi Province. the new taxon differs from other oviraptorids in the weakly downturned rostrum of the lower jaw, much-elongated mandible with a height-to-length ratio being about 20% and the length ratio of radius to humerus of about 0.70. this species not only adds a new member to oviraptorid dinosaurs, but also provides more information about oviraptorid paleogeographical distribution in southern China.

关键词： Oviraptoridae Jiangxisaurus Nanxiong Formation Upper Cretaceous Ganzhou Basin,Jiangxi Province

Characterization and three-dimensional Structural Modeling of Humic Acid via Molecular Mechanics and Molecular Dynamic Simulation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第6期29卷 1180-1184页

作者： ZHAO Nan l(U) Yi-zhong lI Guang-jun College of Resources and Environmental Sciences China Agricultural University Beijing 100193 P.R.China School of Chemistry and Environment Beijing University of Aeronautics and AstronauticsBeijing 100191 P.R.China

the humic acid（HA） sample obtained from the alluvial soil was characterized by elemental composition, pyrolysis gas chromatography-mass spectrometry（Py-GC-MS） and solid-state 13C nuclear magnetic resonance （13C NMR） spectroscopy. there is high fat content and a few nitrogen-containing functional groups in HA. Py-GC-MS demonstrates the characterization and structural identification of HA. One long list of identified pyrolysis products was proposed for the construction of conceptual model of HA. Solid-state 13C NMR data indicate there are higher values of alkyl-C, O-alkyl-C and aryl-C in HA. the elemental composition, structural carbon distribution and l3C NMR spectroscopy of simulated HA are consistent with those of experimental HA. HyperChem was used to simulate the three-dimensional molecular structure of the monomer, which was optimized by the molecular mechanics of the optimized potential for liquid simulations（OPlS） force field and molecular dynamics simulation to get the stable and balanced conformation. the deprotonation process study depicts that the degree of ionization of HA gets deeper, while the electronegativity of HA and the energy of van der Waals（vdW） increase. Moreover, the 3D structure of humic acid with -4 charges is the most stable. the deprotonation process is an endothermic process.

关键词： Alluvial soil Humic acid Conceptual model Elemental analysis Pyrolysis gas chromatography-mass spectrometry(Py-GC-MS) 13C nuclear magnetic resonance(13C NMR) Molecular simulation three-dimensional structure Optimized potential for liquid simulatio

tree-ring:a suitable implement for spatial and temporal fire distribution analysis in savanna woodland and dry forest

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 Forestry Research 2015年第2期26卷 435-446页

作者： Franck Sinsin Romain GlèlèKaka? Bettina Orthmann Brice Sinsin laboratoire d’Ecologie Appliquée Faculté des Sciences AgronomiquesUniversité d’Abomey-Calavi03 BP 1974 CotonouBénin laboratory of Biomathematics and Forest Estimations Faculté des Sciences AgronomiquesUniversité d’Abomey-Calavi03 BP 1974 CotonouBénin Institute of Biosciences University of Rostock

Based on 120 stem discs collected during3 months of fieldwork along a 12 km route,the history of fires in the Wari Maro Forest（09 1000 N–02 1000E） over the past century in savanna woodland and dry forest was *** major ecological areas are characterized：one highly burnt zone located between two relative less burnt *** analyzing tree rings,246 fire scars were *** scars were caused by 51 fire years,occurring at a mean interval of 2.23 *** 1890 to1965,only 6 years with fires were recorded from sampled *** 1966,no year has passed without *** fire frequency point scale reached 14 *** was the case of Burkea africana,which has been identified as a species tolerant to fire and could be planted to create a natural *** contrast,Anogeissus leiocarpa is highly sensitive to fire,and in a dry forest ecosystem that burns seasonally,it requires a special conservation *** new concepts are described：the rebarking of trees after fire and Mean Kilometer Fire *** first concept was tested with Daniellia oliveri（Rolfe） Hutch ＆ Dalz trees,and the second concept was used to evaluate spatial fire *** demonstrate that savanna woodland and dry forest were subject to a degradation process caused by destructive fires related to vegetation cover clearance and illegal logging.

关键词： Fire ecology tree-rings Savanna woodland Dry forest Conservation strategies

Optomechanically induced transparency in a spinning resonator

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2017年第4期5卷 367-371页

作者： HAO lü YAJING JIANG YU-ZHU WANG HUI JING Key laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Physics Henan Normal University Key laboratory of low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University

We study optomechanically induced transparency in a spinning microresonator. We find that in the presence of rotation-induced Sagnac frequency shift, both the transmission rate and the group delay of the signal are strongly affected, leading to a Fano-like spectrum of transparency. In particular, tuning the rotary speed leads to the emergence of nonreciprocal optical sidebands. this indicates a promising new way to control hybrid light–sound devices with spinning resonators.

关键词： rate

Structure modification and recovery of amorphous Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 magnetic ribbons after autoclave treatment:SAXS and thermodynamic analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & technology 2019年第1期35卷 118-126页

作者： l.Y.Guo X.Wang K.C.Shen K.B.Kim S.lan X.l.Wang W.M.Wang Key laboratory for liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Department of Nanotechnology and Advanced Materials Engineering Sejong University Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Department of Physics City University of Hong Kong

the structure, crystallization kinetics and magnetic property of as-quenched Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 amorphous ribbon(R0) as well as ribbons after autoclave treatment at 100°C and 150°C(R1 and R2) have been systematically studied by various techniques. With increasing autoclave treatment temperature,the measured structural, kinetic and magnetic parameters of samples increase firstly, i.e. R0 then decrease or recover to the as-quenched sample, i.e. R2 these results indicate that the SROs in R1 samples increased by transforming from fcc to bcc structure during the autoclave treatment and that the autoclave treatment can decrease the large radius(r_M) MRO(medium range order),but increase the small rMMRO. the measured structural, thermal and magnetic parameters of R2 sample have a tendency to recover toward as-quenched R0 sample. the thermal and magnetic parameters of samples after solely annealing treatment at higher temperature have no obvious recover *** uneven actions of pressure and temperature in autoclave treatment may be helpful for us to search a new method to improve the magnetic properties of Fe-based glasses.

关键词： SAXS (small-angle X-ray scattering) Fe-based glass thermodynamic Magnetic ribbon DSC (differential scanning calorimetry)

Genome-wide screening and transcriptional profile analysis of desaturase genes in the European corn borer moth

在线全文

学校读者我要写书评

暂无评论

Insect Science 2012年第1期19卷 55-63页

作者： Bingye Xue Alejandro P. Rooney Wendell l. Roelofs Department of Entomology NYSAES-Comell University Geneva NY Crop Bioprotection Research Unit National Centerfor Agricultural Utilization Research Agricultural Research Service U.S. Department of Agricuiture Peoria IL USA

Acyl-coenzyme A （Acyl-CoA） desaturases play a key role in the biosynthesis of female moth sex pheromones. Desaturase genes are encoded by a large multigene family, and they have been divided into five subgroups on the basis of biochemical functionality and phylogenetic affinity. In this study both copy numbers and transcriptional levels of desaturase genes in the European corn borer （ECB）, Ostrinia nubilalis, were investigated. the results from genome-wide screening of ECB bacterial artificial chromosome （BAC） library indicated there are many copies of some desaturase genes in the genome. An open reading frame （ORF） has been isolated for the novel desaturase gene ECB ezi-A11~ from ECB gland complementary DNA and its functionality has been analyzed by two yeast expression systems. No functional activities have been detected for it. the expression levels of the four desaturase genes both in the pheromone gland and fat body of ECB and Asian corn borer （ACB）, O. furnacalis, were determined by real-time polymerase chain reaction. In the ECB gland, All is the most abundant, although the amount of A14 is also considerable. In the ACB gland, A14 is the most abundant and is 100 times more abundant than all the other three combined. the results from the analysis of evolution of desaturase gene transcription in the ECB, ACB and other moths indicate that the pattern of A 11 gene transcription is significantly different from the transcriptional patterns of other desaturase genes and this difference is tied to the underlying nucleotide composition bias of the genome.

关键词： bacterial artificial chromosome (BAC) library desaturase European corn borer G+C sex pheromone

Calmodulin Bound Aquaporin-0 Reveals two Distinct Energy Profiles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Molecular Bioscience 2016年第4期6卷 66-79页

作者： l. K. Balcziak t. H. Bach l. R. Montgomery M. E. Warwick U. Akgun Physics Department Coe College Cedar Rapids IA USA

Aquaporin-0 (AQP0) contributes to the nurturing and cleaning of the eye lens of waste products. It is a tetrameric protein composed of four identical monomers, each of which has its own water pore. AQP0 water conduction is regulated by pH, Ca2+ concentration, and the phosphorylation of serine residues at the C-terminal. High cellular Ca2+ concentration enhances the binding of Calmodulin (CaM), a Ca2+ dependent protein, to AQP0 from cytoplasm. this study focuses on determining the differences between the AQP0-CaM and the open AQP0 systems, by using Molecular Dynamics (MD) methods. the water conduction energy profiles are measured with two separate MD simulation techniques revealed two distinct channel profiles for the AQP0-CaM combined model. While the CaM bound channels’ energy barriers exceed the 6 kcal/mol, the no CaM bound AQP0 energy profile stays below 3 kcal/mol. the structural analysis of these different pores during the free equilibrations also supported this conclusion with distinct pore diameters. Unlike the previous report, this study observed Phe75 and His66 taking role in stabilizing the CSII restriction site in CaM bound AQP0.

关键词： Aquaporin-0 Calmodulin Water Channel MD Simulations

In search of a pan-coronavirus vaccine:next-generation vaccine design and immune mechanisms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2024年第2期21卷 103-118页

作者： S.Cankat M.U.Demael l.Swadling Division of Infection and Immunity Institute of Immunity and TransplantationUniversity College LondonPears BuildingLondon NW32PPUK

Members of the coronaviridae family are endemic to human populations and have caused several epidemics and pandemics in recent *** this review,we will discuss the feasibility of and progress toward the ultimate goal of creating a pan-coronavirus vaccine that can protect against infection and disease by all members of the coronavirus *** will detail the unmet clinical need associated with the continued transmission of SARS-CoV-2,MERS-CoV and the four seasonal coronaviruses(HCoV-OC43,Nl63,HKU1 and 229E)in humans and the potential for future zoonotic *** will highlight how first-generation SARS-CoV-2 vaccines and natural history studies have greatly increased our understanding of effective antiviral immunity to coronaviruses and have informed next-generation vaccine *** will then consider the ideal properties of a pan-coronavirus vaccine and propose a blueprint for the type of immunity that may offer ***,we will describe a subset of the diverse technologies and novel approaches being pursued with the goal of developing broadly or universally protective vaccines for coronaviruses.

关键词： Vaccine Coronavirus Cross-reactive immunity Cross-protection Universal

Upgrade of three municipal wastewater treatment lagoons using a high surface area media

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2012年第2期6卷 288-293页

作者： John WANC Peng JINt Paul l.BISHOP Fuzhi lI Meridian Aquatic technology LLC.4061 Powder Mill RoadSuite 100CalvertonMD 20705USA Department of Civil and Environunental Engineering University of CincinnatiCincirmatiOH 45221USA Institute of Nuclear and New Energy technology Tsinghua UniversityBeijing 100084China

Abstract lagoon-based municipal wastewater treatment plants （WWtPs） are facing difficulties meeting the needs of rapid population growth as well as the more stringent requirements of discharge permits. three municipal WWtPs were modified using a high surface area media with upgraded fine-bubble aeration systems. Performance data collected showed very promising results in terms of five-day biochemical oxygen demand （BOD5）, ammonia （NH3） and total suspended solids （tSS） removal. two-year average ammonia effluents were 4.1 mg. l-1 for Columbia WWtP, 4 mg. l-1 for larchmont WWtP and 2.1 mg. l-1 for laurelville WWtE respectively. two- year average BOD5 effluents were 6.8, 4.9 and 2.7 ***, and tSS effluents were 15.0, 9.6 and 7.5 mg.l-l the systems also showed low fecal coliform （FC） levels in their effluents.

关键词： wastewater lagoons wastewater biologicaltreatment ammonia removal high surface area media,fine bubble aeration