检索结果-南通市图书馆

Non-escaping frost tolerant QTL linked genetic loci at reproductive stage in six wheat DH populations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2022年第1期10卷 147-165页

作者： Jingjuan Zhang md Shahidul Islam Yun Zhao Masood Anwar Zaid Alhabbar Maoyun She Rongchang Yang Angela Juhasz Guixiang Tang Jiansheng Chen Hang Liu Yanjie Jiang Shengnan Zhai Xin Hu Junkang Rong Yingquan Zhang Yebo Qin Qier Liu Zitong Yu Yujuan Zhang Sadegh Balotf Mirza Dowla Sonia Afrin Nandita Roy md Resad Mallik md Atik Us Saieed Shanjida Rahman Nigarin Sultana Sarah Al-Sheikh Ahmed Chris Florides Kefei Chen Darshan Sharma nathan Height Ben Biddulph Meiqin Lu Jorge EMayer Wujun Ma Australian-China Joint Centre for Wheat Improvement Western Australian State Agriculture Biotechnology CentreFood Futures InstituteMurdoch UniversitySouth StreetMurdochWA 6150Australia College of Agriculture&Food Zhejiang Agriculture&Forestry UniversityLin’an 311314ZhejiangChina SAGI West Faculty of Science and EngineeringCurtin UniversityBentleyWA 6102Australia Department of Primary Industries and Regional Development Western Australia3 Baron-Hay CourtSouth PerthWA 6151Australia Australian Grain Technologies 12656 Newell HighwayLocked Bag 1100NarrabriNSW 2390Australia Ag RD&IP Consult P/L NerangQLD 4211Australia

Reproductive stage frost poses a major constraint for wheat production in countries such as ***,little progress has been made in identifying key genes to overcome the *** the present study,a severe frost event hit two large-scale field trials consisting of six doubled haploid(DH)wheat populations at reproductive stage(young microspore stage)in Western Australia,leading to the identification of 30 robust frost QTL on 17 *** major 18 QTL with the phenotype variation over 9.5%were located on 13 chromosomes including 2 A,2 B,2 D,3 A,4 A,4 B,4 D,5 A,5 D,6 D,7 A,7 B and7 *** frost QTL were closely linked to the QTL of anthesis,maturity,Zadok stages as well as linked to anthesis related *** of those,six QTL were repetitively detected on the homologous regions on 2 B,4 B,4 D,5 A,5 D,7 A in more than two *** showed that the frost damage is associated with alleles of Vrn-A1 a,Vrn-D1 a,Rht-B1 b,Rht-D1 b,and the high copy number of ***,anthesis QTL and anthesis related genes of Vrn-B1 a and Ta FT3-1 B on chromosomes 5 B and 1 B did not lead to frost damage,indicating that these early-flowering phenotype related genes are compatible with frost tolerance and thus can be utilised in *** results also indicate that wild-type alleles Rht-B1 a and Rht-D1 a can be used when breeding for frost-tolerant varieties without delaying flowering time.

关键词： Anthesis-related genes Wheat DH populations Reproductive stage Non-escaping frost tolerance QTL

A U.S.‒China coal power transition and the global 1.5℃ pathway

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

Advances in Climate Change Research 2022年第2期13卷 179-186页

作者： Ryna Yiyun CUI nathan HULTMAN Di-Yang CUI Haewon MCJEON Leon CLARKE Jia-Hai YUAN Wen-Jia CAI Center for Global Sustainability School of Public PolicyUniversity of MarylandCollege ParkMD20742USA Joint Global Change Research Institute Pacific Northwest National LaboratoryCollege ParkMD20740USA School of Economics and Management North China Electric Power UniversityBeijing102206China Department of Earth System Science Tsinghua UniversityBeijing100084China

As the world seeks to increase ambition rapidly to limit global warming to 1.5℃,joint leadership from the world's largest greenhouse gas(GHG)emitters-the United States(U.S.)and China-will be critical to deliver significant emissions reductions from their own countries as well as to catalyze increased international *** a period of uncertainty in international climate policy,these countries now both have current leadership that supports ambitious climate *** this context,a feasible,high-impact,and potentially globally catalytic agreement by the *** China to transition away from coal to clean energy would be a major contribution toward this global *** undertake a plant-by-plant assessment in the power sector to identify practical coal retirement pathways for each country that are in line with national priorities and the global 1.5℃ *** plant-by-plant analysis shows that the 1.5℃-compatible pathways may result in an average retirement age of 47 years for the *** plants and 22 years for Chinese coal plants,raising important questions of how to compare broader economic,employment,and social *** also demonstrate that such pathways would also lead to significant emissions reductions,lowering overall global energy-related CO_(2) emissions by about 9%in 2030 relative to 2020.A catalytic effect from the possibility of other countries taking compatible actions is estimated to reduce global emissions by 5.1 Gt CO_(2) in 2030 and by 10.1 Gt CO_(2) in 2045.

关键词： U.S.‒China Coal power transition Climate mitigation Paris agreement Integrated assessment modeling

Low-field, high-gradient NMR shows diffusion contrast consistent with localization or motional averaging of water near surfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Magnetic Resonance Letters 2023年第2期3卷 90-107,I0003页

作者： nathan H.Williamson Velencia J.Witherspoon Teddy X.Cai Rea Ravin Ferenc Horkay Peter J.Basser Eunice Kennedy Shriver National Institute of Child Health and Human Development National Institutes of HealthBethesdaMD20892USA Wellcme Centre for Igative Neuromging FMRIBNuffeld Department of Clinical NeurosciencesUiversity of Oxford Oxford OX39DUUK Celoptics RockvilleMD20850USA

Nuclear magnetic resonance(NMR)measurements of water diffusion have been extensively used to probe microstructure in porous materials,such as biological tissue,however primarily using pulsed gradient spin echo(PGSE)***-field single-sided NMR systems have built-in static gradients(SG)much stronger than typical PGSE maximum gradient strengths,which allows for the signal attenuation at extremely high b-values to be ***,we perform SG spin echo(SGSE)and SG stimulated echo(SGSTE)diffusion measurements on biological cells,tissues,and *** on fixed and live neonatal mouse spinal cord,lobster ventral nerve cord,and starved yeast cells all show multiexponential signal attenuation on a scale of b with significant signal fractions observed at b×Do>1 with b as high as 400 ms/*** persistent signal fractions trend with surface-to-volume ratios for these systems,as expected from porous media *** exception found for the case of fixed *** spinal cords was attributed to faster exchange or permeability in live spinal cords than in fixed spinal cords on the millisecond *** suggests the existence of multiple exchange processes in neural tissue,which may be relevant to the modeling of time-dependent diffusion in gray *** observed multi-exponential attenuation is from protons on water and not macromolecules because it remains proportional to the normalized signal when a specimen is washed with *** signal that persists to b×Do>1 is also drastically reduced after delipidation,indicating that it originates from lipid membranes that restrict water *** multiexponential or stretched exponential character of the signal attenuation at b×Do>1 appears mono-exponential when viewed on a scale of(b×Do)/3,suggesting it may originate from localization or motional averaging of water near membranes on sub-micron length *** try to disambiguate these two contributions,signal attenuation curves were compared at varying temper

关键词： Magnetic resonance in porous media Single-sided NMR-MOUSE Microstructure High b-values Short diffusion time Stretched exponential Diffusion MRI contrast mechanisms

Functional perspectives on tropical tree demography and forest dynamics

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

Ecological Processes 2019年第1期8卷 1-11页

作者： Samantha J.Worthy nathan G.Swenson Department of Biology University of MarylandCollege ParkMD 20742USA

Disentangling the processes that drive population,community and whole forest structure and dynamics is a *** becomes a grand challenge in the tropics where there are a large number of species,small population sizes,less research infrastructure,and a relatively smaller number of researchers compared to the temperate *** this grand challenge,we argue,requires detailed knowledge of the functioning of individuals and *** this end,researchers frequently employ plant functional traits to study tree populations and ***,we review this approach by first providing a basic background regarding the major trait axes generally of *** then discuss how these axes may be or have been applied from ecosystem to community and population *** doing so,we highlight where the functional trait research program has failed in tropical tree ecology and where it can be improved or ***,we provide a perspective regarding how functional trait and emerging‘omics approaches can be integrated to address large questions facing the *** intention throughout is to provide an entryway into this literature for an early career researcher rather than a comprehensive review of all possible studies that have taken place in tropical forests.

关键词： Demographic rate Functional diversity Functional trait Transcriptome Tropical forest Tropical rain forest

A micromirror array with annular partitioning for high-speed random-access axial focusing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 241-255页

作者： nathan Tessema Ersumo Cem Yalcin Nick Antipa Nicolas Pegard Laura Waller Daniel Lopez Rikky Muller The University of California Berkeley and University of CaliforniaSan Francisco Graduate Program in BioengineeringBerkeleyCA 94720USA Department of Electrical Engineering&Computer Sciences University of CaliforniaBerkeleyCA 94720USA Department of Applied Physical Sciences University of North Carolina at Chapel HillChapel HillNC 27514USA Chan Zuckerberg Biohub San FranciscoCA 94158USA Physical Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA

Dynamic axial focusing functionality has recently experienced widespread incorporation in microscopy,augmented/virtual reality(AR/VR),adaptive optics and material ***,the limitations of existing varifocal tools continue to beset the performance capabilities and operating overhead of the optical systems that mobilize such *** varifocal tools that are the least burdensome to operate(*** crystal,elastomeric or optofluidic lenses)suffer from low(≈100 Hz)refresh ***,the fastest devices sacrifice either critical capabilities such as their dwelling capacity(*** gradient lenses or monolithic micromechanical mirrors)or low operating overhead(*** mirrors).Here,we present a general-purpose random-access axial focusing device that bridges these previously conflicting features of high speed,dwelling capacity and lightweight drive by employing lowrigidity micromirrors that exploit the robustness of defocusing phase ***,the device consists of an 8.2mm diameter array of piston-motion and 48-μm-pitch micromirror pixels that provide 2πphase shifting for wavelengths shorter than 1100 nm with 10-90% settling in 64.8μs(i.e.,15.44 kHz refresh rate).The pixels are electrically partitioned into 32 rings for a driving scheme that enables phase-wrapped operation with circular symmetry and requires<30 V per *** experiments demonstrated the array’s wide focusing range with a measured ability to target 29 distinct resolvable depth ***,the features of the proposed array offer the potential for compact,straightforward methods of tackling bottlenecked applications,including high-throughput single-cell targeting in neurobiology and the delivery of dense 3D visual information in AR/VR.

关键词： mirror axial random

Who should you be following? The top 100 social media influencers in orthopaedic surgery

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 Orthopedics 2019年第9期10卷 327-338页

作者： nathan H Varady Akash A Chandawarkar Willem A Kernkamp Itai Gans Department of Orthopaedic Surgery Massachusetts General Hospital/Harvard Medical SchoolBostonMA 02114United States Department of Plastic and Reconstructive Surgery Johns Hopkins University School of MedicineBaltimoreMD 21205United States Department of Orthopaedic Surgery Johns Hopkins University School of MedicineBaltimoreMD 21205United States

BACKGROUND Social media has been credited with the potential to transform medicine,and Twitter was recently named“an essential tool”for the academic *** this,peer-to-peer and educational influence on social media has not been studied within orthopaedic *** knowledge is important to identify who is controlling the conversation about orthopaedics to the *** hypothesized that the plurality of top influencers would be sports medicine surgeons,that social media influence would not be disconnected from academic productivity,and that some of the top social media influencers in orthopaedic surgery would not be orthopaedic *** To identify the top 100 social media influencers within orthopaedics,characterize who they are,and relate their social media influence to academic *** Twitter influence scores for the topic“orthopaedics”were collected in July 2018 using Right Relevance *** accounts with the top influence scores were linked to individual names,and the account owners were characterized with respect to specialty,subspecialty,practice setting,location,board certification,and academic Hirsch index(h-index).RESULTS Seventy-eight percent of top influencers were orthopaedic *** most common locations included California(13%),Florida(8%),New York(7%),United Kingdom(7%),Colorado(6%),and Minnesota(6%).The mean academic h-index of the top influencers(n=79)was 13.67±4.12(mean±95%CI)and median 7(range 1-89)(median reported h-index of academic orthopaedic faculty is 5 and orthopaedic chairpersons is 13).Of the 78 orthopaedic surgeons,the most common subspecialties were sports medicine(54%),hand and upper extremity(18%),and spine(8%).Most influencers worked in private practice(53%),followed by academics(17%),privademics(14%),and hospital-based(9%).All eligible orthopaedic surgeons with publicly-verifiable board certification statuses were board-certified(n=74).CONCLUSION The top orthopaedic social media influencers on

关键词： Social media Influence Impact Twitter Orthopaedics Orthopedics

Reentrant equilibrium disordering in nanoparticle-polymer mixtures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2017年第1期3卷 457-463页

作者： Dong Meng Sanat K.Kumar Gary S.Grest nathan A.Mahynski Athanassios Z.Panagiotopoulos Department of Chemical Engineering Columbia UniversityNew YorkNY 10027USA Sandia National Laboratories AlbuquerqueNM 87185Mexico Department of Chemical and Biological Engineering Princeton UniversityPrincetonNJ 08544USA Dave C.Swalm School of Chemical Engineering Mississippi State UniversityStarkvilleMS 39762US Chemical Sciences Division National Institutes of Standards and TechnologyGaithersburgMD 20899US

A large body of experimental work has established that athermal colloid/polymer mixtures undergo a sequence of transitions from a disordered fluid state to a colloidal crystal to a second disordered phase with increasing polymer *** transitions are driven by polymer-mediated interparticle attraction,which is a function of both the polymer density and *** has been posited that the disordered state at high polymer density is a consequence of strong interparticle attractions that kinetically inhibit the formation of the colloidal crystal,i.e.,the formation of a non-equilibrium gel phase interferes with *** we use molecular dynamics simulations and density functional theory on polymers and nanoparticles(NPs)of comparable size and show that the crystal-disordered phase coexistence at high polymer density for sufficiently long chains corresponds to an equilibrium thermodynamic phase *** the crystal is,indeed,stabilized at intermediate polymer density by polymer-induced intercolloid attractions,it is destabilized at higher densities because long chains lose significant configurational entropy when they are forced to occupy all of the crystal *** results are in quantitative agreement with existing experimental data and show that,at least in the nanoparticle limit of sufficiently small colloidal particles,the crystal phase only has a modest range of thermodynamic stability.

关键词： stability polymer equilibrium

New opportunities for using WUS/BBM and GRF-GIF genes to enhance genetic transformation of ornamental plants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ornamental Plant Research 2022年第1期2卷 32-38页

作者： Hui Duan nathan A.Maren Thomas G.Ranney Wusheng Liu USDA-ARS U.S.National ArboretumFloral and Nursery Plants Research UnitBeltsville Agricultural Research Center(BARC)-WestBeltsvilleMD 20705USA Department of Horticultural Science North Carolina State UniversityRaleighNC 27607USA Mountain Crop Improvement Lab Department of Horticultural ScienceMountain Horticultural Crops Research and Extension CenterNorth Carolina State UniversityMills RiverNC 28759USA

Broad application of plant transformation remains challenging because the efficiency of plant regeneration and regeneration-based transformation in many plant species is extremely *** species and genotypes are not responsive to traditional hormone-based regeneration *** regeneration recalcitrance hampers the application of many technologies such as micropropagation,transgenic breeding,and gene editing in various plant species,including ornamental flowers,shrubs,and *** developmental genes have long been studied for their ability to improve plant meristematic induction and ***,it was demonstrated that the combined and refined expression of morphogenic regulator genes WUSCHEL and BABY BOOM could alleviate their pleiotropic effects and permit transformation in recalcitrant ***,ectopic expression of plant growth-regulating factors(GRFs)alone or in combination with GRF-interacting factors(GIFs)improved the regeneration and transformation of dicot and monocot ***-tuning the expression of these genes provides new opportunities to improve transformation efficiencies and facilitate the application of new breeding technologies in ornamental plants.

关键词： transformation GRF breeding

E-DNA scaffold sensors and the reagentless, single- step, measurement of HIV-diagnostic antibodies in human serum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2020年第1期6卷 1141-1148页

作者： Claudio Parolo Ava S.Greenwood nathan E.Ogden Di Kang Chase Hawes Gabriel Ortega Netzahualcoyotl Arroyo-Curras Kevin W.Plaxco Department of Chemistry and Biochemistry University of CaliforniaSanta BarbaraSanta BarbaraCAUSA Department of Materials University of CaliforniaSanta BarbaraSanta BarbaraCAUSA Department of Pharmacology and Molecular Sciences Johns Hopkins School of MedicineBaltimoreMD 21205USA Interdepartmental Program in Biomolecular Science and Engineering University of CaliforniaSanta BarbaraSanta BarbaraCA 93106USA

The multiplexed,point-of-care measurement of specific antibodies could improve the speed with which diseases are diagnosed and their treatment *** this end,we are developing E-DNA scaffold sensors,which consist of a rigid,nucleic acid“scaffold”attached on one end to an electrode and presenting both a redox reporter and an epitope on the *** the absence of antibody,the reporter efficiently transfers electrons when interrogated ***-induced steric hindrance limits movement,reducing electron transfer in a manner that is both easily measured and quantitatively related to target *** we have used monoclonal antibodies to explore the analytical performance of E-DNA sensors,showing that they support the rapid,single-step,quantitative detection of multiple antibodies in small volume ***,in contrast,we employ authentic human samples to better explore the platform’s clinical ***,we developed E-DNA sensors targeting three HIV-specific antibodies and then compared the analytical and clinical performance of these against those of gold standard serological *** so we find that,although the multistep amplification of an ELISA leads to a lower detection limits,the clinical sensitivity of ELISAs,E-DNA sensors and lateral-flow dipsticks are indistinguishable across our test *** thus appears that,by merging the quantitation and multiplexing of ELISAs with the convenience and speed of dipsticks,E-DNA scaffold sensors could significantly improve on current serological practice.

关键词： antibodies attached initiated