检索结果-南通市图书馆

Post photorefractive keratectom. corneal ectasia

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalm.logy(English edition) 2017年第2期10卷 315-317页

作者： Anna m.Roszkowska m.rgherita S Som.ario m.rio urso Pasquale Aragona Cornea and Refractive Surgery Section Ophthalmology UnitDepartment of Specialized SurgeriesUniversity Hospital of MessinaMessina 98125Italy

Dear Editor,We write to describe two cases of corneal ectasia occurred after photorefractive *** to the wide diffusion of refractive surgery,m.ny ophthalm.logists attem.ted to identify the risk factors and prevention ... 详细信息

关键词： PRK Post photorefractive keratectom. corneal ectasia Figure

Oryza CLIm.ools:A genom.–environm.nt association resource reveals adaptive roles for heterotrim.ric G proteins in the regulation of rice agronom.c traits

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Com.unications 2024年第4期5卷 145-165页

作者： Angel Ferrero-Serrano David Chakravorty Kobie J.Kirven Sarah m.Assm.nn Biology Departm.nt Pennsylvania State University208 Mueller LaboratoryUniversity ParkPA 16802USA Intercollege Graduate Degree Program.in Bioinform.tics and Genom.cs Pennsylvania State University208 Mueller LaboratoryUniversity ParkPA 16802USA

m.dern crop varieties display a degree of m.sm.tch between their current distributions and the suitability of the local clim.te for their *** address this issue,we present Oryza CLIm.ools(https://***/CLIm.ools/oryza_v1.0/),thefirst resource for pan-genom. prediction of clim.te-associated genetic variants in a crop *** CLIm.ools consists of interactive web-based databases that enable the user to(1)explore the local environm.nts of traditional rice varieties(landraces)in South-East Asia and(2)investigate the environm.nt by genom. associations for 658 Indica and 283 Japonica rice landrace accessions collected from.georeferenced local environm.nts and included in the 3K Rice Ge-nom.s *** dem.nstrate the value of these resources by identifying an interplay betweenflowering tim. and tem.erature in the local environm.nt that is facilitated by adaptive natural variation in OsHD2 and disrupted by a natural variant in *** quantitative trait locus analysis has suggested the im.or-tance of heterotrim.ric G proteins in the control of agronom.c ***,we analyzed the clim.te associations of natural variants in the different heterotrim.ric G protein *** identified a coordi-nated role of G proteins in adaptation to the prevailing potential evapotranspiration gradient and revealed their regulation of key agronom.c traits,including plant height and seed and panicle *** conclude by highlighting the prospect of targeting heterotrim.ric G proteins to produce clim.te-resilient crops.

关键词： Oryza sativa rice G by E adaptation flowering tim. GWAS OsHD2 OsSOC1 heterotrim.ric G pro-tein OsRGA1 d1 OsGS3 OsDEP1 OsGGC2

Effect of Com.ined Chilling and GA_3 Treatm.nt on Bud Abortion in Forced ‘Luoyanghong' Tree Peony(Paeonia suffruticosa Andr.)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2018年第6期4卷 250-256页

作者： m.RNYA philip m.P. CHENG Fangyun National Flower Engineering Research Center College of Landscape Architecture Beijing Forestry University School of Natural Resources m.nagem.nt Njala University National Flower Engineering Research Center College of Landscape ArchitectureBeijing Forestry University

This research investigated the effect of com.ined chilling and GA_3 treatm.nt on bud abortion of tree peony under greenhouse conditions to determ.ne the dynam.cs of exogenous horm.nes and chilling effects on bud abortion. Research of such nature will increase the understanding of the effects of GA_3 and chilling level on flower developm.nt thereby, prom.ting off-season cultivation techniques in tree peonies to increase production that m.ets m.rket dem.nd. Horm.ne and sugar levels in the ‘Luoyanghong' tree peony were respectively determ.ned using High-Perform.nce Liquid Chrom.tography(HPLC) and spectrophotom.ter. Non-potted chilling with 200 m.·L^(-1) GA_3 treatm.nt reduced bud abortion rate. Flowering rate in non-potted chilling with 200 m.·L^(-1) GA_3 plants was 58%, as against 21% in potted chilling plants with 200 m.·L^(-1) GA_3 treatm.nt. Sugar accum.lation in retained or aborted flower buds was conversely related to ABA level. Low ABA and high sugar levels were noted in retained buds whereas the reverse induced bud abortion. ABA level apparently inhibited sucrose and reducing sugar uptake in aborted buds whereas GA_3 enhanced sucrose uptake in retained buds. GA_3 and IAA levels were higher in retained than in aborted buds, which m.de plants with retained bud m.re com.etitive in nutrient uptake(by root)for growth and developm.nt. Overall, com.ined chilling and GA_3 treatm.nt enhanced plant growth and developm.nt, particularly bud sprouting, growth and flowering.

关键词： tree peony bud abortion chilling horm.ne sugar GA3 ABA IAA

Predicting June m.an Rainfall in the m.ddle/Lower Yangtze River Basin

在线全文

学校读者我要写书评

暂无评论

Advances in Atm.spheric Sciences 2020年第1期37卷 29-41页

作者： Gill m.m.RTIN Nick J.DUNSTONE Adam.A.SCAIFE philip E.BETT m.t Office Exeter

We dem.nstrate that there is significant skill in the GloSea5 operational seasonal forecasting system.for predicting June m.an rainfall in the m.ddle/lower Yangtze River basin up to four m.nths in *** of the rainfall in this region during June is contributed by the m.i-yu rain *** find that sim.lar skill exists for predicting the East Asian sum.er m.nsoon index(EASm.)on m.nthly tim. scales,and that the latter could be used as a proxy to predict the regional ***,there appears to be little to be gained from.using the predicted EASm. as a proxy for regional rainfall on m.nthly tim. scales com.ared with predicting the rainfall *** interannual variability of the June m.an rainfall is affected by synoptic and intraseasonal variations,which m.y be inherently unpredictable on the seasonal forecasting tim. scale,the m.jor influence of equatorial Pacific sea surface tem.eratures from.the preceding winter on the June m.an rainfall is captured by the m.del through their influence on the western North Pacific subtropical *** ability to predict the June m.an rainfall in the m.ddle and lower Yangtze River basin at a lead tim. of up to 4 m.nths suggests the potential for providing early inform.tion to contingency planners on the availability of water during the sum.er season.

关键词： forecast skill EASm. m.nthly m.an rainfall East Asian sum.er m.nsoon Yangtze River basin

Rem.te platelet function testing using P-selectin expression in patients with recent cerebral ischaem.a on clopidogrel

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2021年第1期6卷 103-108页

作者： Jason philip Appleton Carla Richardson Natalia Dovlatova Jane m.y Nikola Sprigg Stan Heptinstall philip m.Bath Stroke Trials Unit Division of Clinical NeuroscienceUniversity of NottinghamNottinghamUK Stroke Division Nottingham University Hospitals NHS TrustNottinghamUK Platelet Solutions Ltd Division of Clinical NeuroscienceQueen's Medical CentreUniversity of NottinghamNottinghamUK Platelet Research Group Division of Clinical NeuroscienceQueen's Medical CentreUniversity of NottinghamNottinghamUK

Background Antiplatelet agents reduce recurrence after cerebral ischaem.a but are not effective in all patients,in part because of treatm.nt *** prim.ry aim.was to assess the proportion of patients who are insensitive to *** secondary aim.was to assess the association between insensitivity to clopidogrel and recurrent cerebrovascular *** Following written inform.d consent,independent patients with a recent non-cardioem.olic ischaem.c stroke or transient ischaem.c attack,and taking clopidogrel,were *** function was assessed with rem.te m.asurem.nt of surface expression of P-selectin(CD62P)using com.ercial kits sensitive to aspirin or ***’general practitioners provided details on recurrent vascular events at least 90 days *** are m.an(SD)and m.dian[IQR].Resistance was defined as:aspirin m.dian fluorescence(m.)>500 units,clopidogrel m.>860 ***-param.tric descriptors and tests were *** 63 patients were recruited:m.an age 64(13.7)years,wom.n 47%.At baseline,59(95%)patients were taking clopidogrel alone with 3(5%)on com.ined clopidogrel and *** of platelet surface P-selectin revealed:aspirin test 528[317,834],>50054.8%;clopidogrel test 429[303,656],>86011.3%.No participants on aspirin and clopidogrel showed aspirin ***(20.6%)patients had a recurrent cerebrovascular event;those with an ischaem.c stroke had a non-significantly higher baseline P-selectin using the clopidogrel test as com.ared with those with no recurrence:626[380,801]versus 406[265,609],p=*** Rem.te m.asurem.nt of platelet function assessed using the platelet surface expression of P-selectin is feasible.11%of patients taking clopidogrel showed *** significant associations were noted between clopidogrel resistance and recurrent ischaem.c events.

关键词： patients cerebral function

The Probability of Pairwise Shared Ancestry and the Expected Num.er of Pairs of k-th Cousins in a Population Sam.le

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Natural Science 2022年第11期14卷 472-482页

作者： philip m. Service Departm.nt of Biological Sciences Northern Arizona University Flagstaff USA

An analytical solution is derived for the probability that a random.pair of individuals from.a panm.ctic population of size N will share ancestors who lived G generations previously. The analysis is extended to obtain 1) the probability that a sam.le of size s will contain at least one pair of (G - 1)th cousins;and 2) the expected num.er of pairs of (G - 1)th cousins in that sam.le. Solutions are given for both m.nogam.us and prom.scuous (non-m.nogam.us) cases. Sim.lation results for a population size of N = 20,000 closely approxim.te the analytical expectations. Sim.lation results also agree very well with previously derived expectations for the proportion of unrelated individuals in a sam.le. The analysis is broadly consistent with genetic estim.tes of relatedness am.ng a sam.le of 406 Danish school children, but suggests that a different genetic study of a heterogenous sam.le of Europeans overestim.tes the frequency of cousin pairs by as m.ch as one order of m.gnitude.

关键词： Pairwise Shared Ancestry Sim.lation Denm.rk Num.er of Cousins Population Sam.le Population Structure

Pairwise Shared Ancestry in Random.m.ting Constant-Size 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

Natural Science 2022年第5期14卷 193-202页

作者： philip m. Service Departm.nt of Biological Sciences Northern Arizona University Flagstaff USA

In a panm.ctic population of constant size N, random.pairs of individuals will have a m.st recent shared ancestor who lived slightly m.re than 0.5 log2N generations previously, on average. The probability that a random.pair of individuals will share at least one ancestor who lived 0.5 log2N generations ago, or m.re recently, is about 50%. Those individuals, if they do share an ancestor from.that generation, would be cousins of degree (0.5 log2N) - 1. Shared ancestry from.progressively earlier generations increases rapidly until there is universal pairwise shared ancestry. At that point, every individual has one or m.re ancestors in com.on with every other individual in the population, although different pairs m.y share different ancestors. Those ancestors lived approxim.tely 0.7 log2N generations in the past, or m.re recently. Qualitatively, the ancestries of random.pairs have about 50% sim.larity for ancestors who lived about 0.9 log2N generations before the present. That is, about half of the ancestors from.that generation belonging to one m.m.er of the pair are present also in the genealogy of the other m.m.er. Qualitative pairwise sim.larity increases to m.re than 99% for ancestors who lived about 1.4 log2N generations in the past. Sim.lar results apply to a m.tric of quantitative pairwise genealogical overlap.

关键词： Pairwise Shared Ancestry Genealogical Overlap Quantitative Ancestry m.st Recent Com.on Ancestor Num.er of Cousins

Pairwise Shared Genealogical Ancestry in Structured 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

Natural Science 2022年第8期14卷 305-321页

作者： philip m. Service Departm.nt of Biological Sciences Northern Arizona University Flagstaff AZ USA

Sim.lation was used to investigate the effects of population structure and m.gration on m.trics of pairwise shared ancestry. Random.and hierarchical structures, or m.gration geom.tries, were exam.ned. Com.ared to panm.ctic populations, progress to all qualitative m.trics of pairwise ancestry is delayed in structured populations. However, unless m.gration is very low, the tim. required is generally less than triple and often less than twice that required in a panm.ctic population of the sam. total size. Population structure also increases, to a sim.lar degree, the tim. required for a population-wide m.st recent com.on ancestor (m.CA). As a result, the relationships between various qualitative m.trics of pairwise shared ancestry and m.CA tim. are relatively unaffected by population structure. For exam.le, the m.an tim. to m.st recent shared ancestor (m.SA) with global sam.ling of pairs is 40% - 50% of the m.CA tim. for alm.st all sim.lated structures and m.gration levels. Quantitative pairwise genealogical overlap is strongly affected by population structure. With global sam.ling, pairwise quantitative overlap never approaches 1.0, as it does in panm.ctic populations;and instead eventually becom.s stationary at m.ch lower values. Possible im.lications of the present results for hum.n pairwise shared ancestry are discussed. For globally sam.led pairs, the longest tim. to m.st recent shared ancestor (m.SA) for hum.ns is suggested to be approxim.tely 2100 years before the present. If generation tim. is 30 years, then all hum.ns are 69th, or closer, cousins. For people with recent European ancestry, the m.SA tim. m.y be only half as long, about 1000 years.

关键词： Population Structure Pairwise Shared Ancestry Genealogy m.gration m.st Recent Com.on Ancestor Hum.ns

Pitting and stress corrosion cracking studies on AISI type 316N stainless steel weldm.nts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2018年第3期14卷 226-237页

作者： Anita Toppo m.G.Pujar N.Sreevidya John philip Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research m.terials Developm.nt and Technology Division Indira Gandhi Centre for Atomic Research

Pitting and stress corrosion cracking(SCC) studies on the 316 N stainless steel(SS) weldm.nts in aswelded(AW) and therm.lly aged(solution annealing(SA), 550C/4 h and 750C/1 h) conditions were carried out in acidic and acidic chloride m.dia. Pitting corrosion and SCC resistance was the highest for SA weldm.nt, which was attributed to hom.genization of m.crostructural and m.crochem.cal heterogeneities during solution annealing. SA specim.n showed the m.st stable passive film.as com.ared to AW weldm.nt because of higher am.unt of delta-ferrite in AW weld m.tal, which resulted in an increased heterogeneity and inferior SCC resistance in AW. Stability of passive film.was found to be adversely affected due to heat treatm.nts(at 550C/4 h and 750C/1 h) because of the precipitation of carbide and sigm. phases.

关键词：压力腐蚀不锈钢 AISI 焊接金属 SCC 稳定性氯化物微结构