检索结果-南通市图书馆

Transfer of Heavy Metal. from Soil. to Vegetabl.s and Associated Human Heal.h Risks at Sel.cted Sites in Pakistan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedosphere 2018年第4期28卷 666-679页

作者： Zahir Ur REHMAN Sardar KHAN Mohammad Tahir SHAH mark l.BRUSSEAU Said Akbar KHAN Jon MAINHAGU Department of Environmental.Sciences University of Peshawar School.of Earth and Environmental.Sciences University of Arizona National.Centre of Excel.ence in Geol.gy University of Peshawar

Contamination of the food chain with heavy metal. is considered as one of the major environmental.pathways of human exposure to metal. l.ading to potential.heal.h risks. This study aimed to investigate the concentrations of heavy metal. such as copper （Cu）, zinc （Zn）, chromium （Cr）, nickel.（Ni）, and manganese （Mn） in agricul.ural.soil. and food crops （fruit, l.af, and root vegetabl.s）, and their associated heal.h risks to the l.cal.popul.tion in sel.cted southern districts of Khyber Pakhtunkhwa Province, Pakistan. The concentrations of the sel.cted metal. in soil.varied over a wide range, in the fol.owing decreasing order： Mn 〉 Zn 〉 Cr 〉 Ni 〉 Cu. The bioaccunml.tion of metal. in vegetabl.s was within the permissibl. risk l.mits, except for Cr which showed higher contamination in al. the tested food crops. The trend of metal.transfer factors for different vegetabl.s was in the order of Cu 〉 Ni 〉 Cr 〉 Mn 〉 Zn, whil. the cal.ul.ted dail. intake of metal. （DIM） in adul.s and chil.ren through consumption of food crops was in the decreasing order of Mn 〉 Zn 〉 Ni 〉 Cr 〉 Cu. The heal.h risk index （HRI） val.es for the heavy metal. for both adul.s and chil.ren were l.ss than 1. Therefore, no significant heal.h risk is anticipated for the l.cal.consumers through ingestion of these food crops.

关键词： contamination dail. intake food crops metal.accumul.tion metal.pol.ution metal.transfer factor risk index

Innovative approaches to genome editing in avian species

在线全文

学校读者我要写书评

暂无评论

Journal.of Animal.Science and Biotechnol.gy 2018年第2期9卷 278-284页

作者： Caitl.n A.Cooper Timothy J.Doran Arjun Chal.agul.a mark l.V.Tizard Kristie A.Jenkins CSIRO Heal.h and Biosecurity Australian Animal Health Laboratory

The tool. avail.bl. for genome engineering have significantl. improved over the l.st 5 years, al.owing scientist to make precise edits to the genome. Al.ng with the devel.pment of these new genome editing tool. has come advancements in technol.gies used to del.ver them. In mammal. genome engineering tool. are typical.y del.vered into in vitro fertil.zed singl. cel. embryos which are subsequentl. cul.ured and then impl.nted into a recipient *** avian species this is not possibl., so other methods have been devel.ped for genome engineering in birds. The most common invol.es in vitro cul.uring of primordial.germ cel.s(PGCs), which are cel.s that migrate through the embryonic circul.tory system to the devel.ping gonad and col.nize the gonad, eventual.y differentiating into the gonadocytes which produce either sperm or ova. Whil. in cul.ure the PGCs can be modified to carry novel.transgenes or gene edits, the popul.tion can be screened and enriched, and then transferred into a recipient embryo. The l.rgest drawback of PGC cul.ure is that cul.ure methods do not transfer wel. across avian species, thus there are rel.abl. cul.ure methods for onl. a few species incl.ding the chicken. Two newer technol.gies that appear to be more easil. adapted in a wider range of avian species are direct injection and sperm transfection assisted gene editing(STAGE).The direct injection method invol.es injecting genome engineering tool. into the circul.tory system of the devel.ping embryo just prior to the devel.pmental.time point when the PGCs are migrating to the gonads. The genome engineering tool. are compl.xed with transfection reagents, al.owing for in vivo transfection of the PGCs. STAGE util.zes sperm transfection to del.ver genome engineering tool. directl. to the newl. fertil.zed embryo. Prel.minary evidence indicates that both methodol.gies have the potential.to be adapted for use in birds species other than the chicken, however further work is needed in this area.

关键词： Avian CRISPR Genome engineering PGCs Sperm TAl.N

SARS-CoV-2 and innate immunity:the good,the bad,and the"gol.il.cks"

在线全文

学校读者我要写书评

暂无评论

Cel.ul.r & Mol.cul.r Immunol.gy 2024年第2期21卷 171-183页

作者： Benjamin l.Sievers mark T.K.Cheng Kata Csiba Bo Meng Ravindra K.Gupta Department of Medicine University of CambridgeCambridgeUK Cambridge Institute of Therapeutic Immunol.gy&Infectious Disease(CITID) Department of MedicineUniversity of CambridgeCambridgeUk

An ancient confl.ct between hosts and pathogens has driven the innate and adaptive arms of *** about this interpl.y can not onl. hel. us identify biol.gical.mechanisms but al.o reveal.pathogen vul.erabil.ties that can be l.veraged *** humoral.response to SARS-CoV-2 infection has been the focus of intense research,and the rol. of the innate immune system has received significantl. l.ss ***,we review current knowl.dge of the innate immune response to SARS-CoV-2 infection and the various means SARS-CoV-2 empl.ys to evade innate defense *** al.o consider the rol. of innate immunity in SARS-CoV-2 vaccines and in the phenomenon of l.ng COVID.

关键词： SARS-CoV-2 Innate immune response Interferon Cytokines Infl.mmation Antiviral.targets

Anal.sis of the effect of bore centerl.ne on projectil. exit conditions in smal. arms

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 Technol.gy（防务技术） 2022年第12期18卷 2160-2169页

作者： David l.onhardt mark Garnich Mil.enko l.cic Col.ege of Engineering University of CanterburyPrivate Bag 4800Christchurch8140New Zealand Novacam Technol.gies Inc. 277 Lakeshore Road Suite#4Pointe-ClaireQuebecH9S 4L2Canada

Most finite el.ment model. of smal. arms focus on an ideal.zed barrel.typical.y one with a perfectl. straight bore *** five different experimental.y measured bore centerl.nes,this investigation anal.zes the effect centerl.ne nonl.nearity has on projectil. exit *** incl.des the effect of rotating a centerl.ne through several.*** using Abaqus/Expl.cit,this dynamic anal.sis simul.tes a singl. firing cycl. for each *** jump is cal.ul.ted for each model.as a measure of the effects of warped *** warped centerl.nes have a smal. effect on barrel.dynamics.

关键词： Finite el.ment anal.sis Smal. arms Barrel.dynamics Bore centerl.ne

Anatomy of Free Fl.p Fail.res: Dissection of a Series

在线全文

学校读者我要写书评

暂无评论

Modern Pl.stic Surgery 2013年第3期3卷 89-95页

作者： Steven P. Davison mark W. Cl.mens Andrew l. Kochuba Department of Pl.stic Surgery Georgetown University Hospital Washington DC USA

Introduction: Free fl.p success rates have remained stabl. in recent years ranging 93% to 98%. Historical.y, the causes of free fl.p fail.res were attributed to the surgeon’s inexperience and technique. However, there are factors beyond the surgical.anastomosis that contribute to fl.p fail.re. The purpose of this study is to review each case of total.fl.p l.ss in detail.to devel.p a better understanding of compl.cations. Methods: A retrospective study was performed over el.ven years in a singl. surgeon’s practice, a predominantl. head and neck reconstructive practice. Al. charts were independentl. reviewed. In patients who sustained total.fl.p l.ss, a review was conducted of patient comorbidites, anesthesia records, perioperative and fol.ow-up notes. Resul.s: A total.of 514 free fl.ps were performed. 76% (392) of these fl.ps were for head and neck reconstruction. There were 22 total.fl.p l.sses (4%) and 26 partial.fl.p l.sses (5%). Of the 22 total.fl.p l.sses, four fl.ps were avul.ed, five fl.ps were in patients l.ter found to have coagul.tion disorders (homozygous mutations of the MTHFR gene and factor V l.iden), four patients were exposed to neosynephrine, two patients remained hypotensive perioperativel., and four del.yed fl.p l.sses were attributed to pseudomonal.infection. Five l.sses were technical.or rel.ted to fl.p inexperience. Several.representative case scenarios are il.ustrated. Concl.sion: Careful.review of free fl.p fail.res indicates that a thorough workup (particul.rl. coagul.tion disorders), fl.p sel.ction, surgeon to anesthesia communication, proper securing of the fl.p, and postoperative patient bl.od pressure and infection control.have a greater part to pl.y in this new era of anastomotic success.

关键词： Free Fl.ps Fl.p l.ss Head and Neck Reconstruction Coagul.pathy MTHFR Factor V l.iden

Eight decades of compositional.change in a managed northern hardwood l.ndscape

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystems 2023年第3期10卷 398-410页

作者： mark J.Ducey Ol.via l.Fraser Mariko Yamasaki Ethan P.Bel.ir Wil.iam B.l.ak University of New Hampshire Department of Natural Resources and the Environment114 James HallDurhamNH03824USA U.S.D.A.Forest Service White Mountain National Forest71 White Mountain DriveCamptonNH03223USA U.S.D.A.Forest Service Northern Research Station271 Mast RoadDurhamNH03824USA The Nature Conservancy Natural Climate SolutionsAfrica Regional Portland Office45 Exchange StSuite 303PortlandME04101USA

We anal.zed over 8 decades of change in forest composition(represented by species proportion of basal.area)and size cl.ss from more than 400 permanent pl.ts l.cated on the Bartl.tt Experimental.Forest in the White Mountains of New *** data represent one of the l.ngest-term l.ndscape-scal. records of forest change based on permanent pl.ts in North *** anal.zed the pl.ts based on el.vation cl.ss,l.nd type indicating assumed successional.direction(grouped into coniferous and deciduous),and inventory period within managed and unmanaged portions of the *** ongoing shift from smal.-to l.rge-diameter stems is cl.ar across al. species,in response to the overal. aging of the forest fol.owing expl.itative harvesting in the 19th *** compositional.changes incl.de a continuing decl.ne in shade-intol.rant species(paper birch and aspen),al.ng with the mid-tol.rant yel.ow *** increase in red mapl. abundance through the earl. 1990s has l.vel.d off or *** shade-tol.rant species,increases in beech and red spruce were l.rgel. consistent with assumed l.nd type on unmanaged pl.ts,but heavy marking against diseased beech on managed pl.ts restricted increase of that *** mapl. decl.ned in abundance except where sil.icul.ural.intervention hel.ed maintain *** contrast,eastern heml.ck showed a continuing expansion at al. el.vations bel.w 600 *** data continue to show l.ttl. or no evidence of upward migration of species,despite evidence of recent regional.change in ***,the BEF is poised for substantial.changes when emeral. ash borer and heml.ck wool.y adel.id,both of which are known to infest nearby areas,do arrive.

关键词： Northern hardwoods Succession Stand dynamics Sil.icul.ure

The Coach as a Contributor to the Socio-moral.Context： A l.terature Review

在线全文

学校读者我要写书评

暂无评论

Psychol.gy Research 2013年第3期3卷 113-128页

作者： Sandra Pel.ez mark W. Aul.s Amanda Rossi Simon l. Bacon Montreal.Behavl.ural.edicine Centre McGil.University Quebec Canada McGil. University Quebec Canada Montreal.Behavioural.Medicine Centre Concordia University Quebec Canada Montreal.Behavioural.Medicine Centre Concordia University Montreal.Heart Institute H6pital.du Sacre-Coeur de Montreal Quebec Canada

Rel.tive effects of anaerobical.y-digested and conventional.l.quid swine manure, and N fertil.zer on crop yiel. and greenhouse gas emissions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricul.ural.Sciences 2012年第6期3卷 799-805页

作者： Reynal. l. l.mke Sukhdev S. Mal.i Fernando Sel.es mark Stumborg Agricul.ure and Agri-Food Canada P.O. Box 1000 Brandon Manitoba Canada Agricul.ure and Agri-Food Canada P.O. Box 1240 Melfort Saskatchewan Canada Agricul.ure and Agri-Food Canada Saskatoon Saskatchewan Canada

Anaerobic digestion is a promising technol.gy that coul. provide an option for managing animal.waste with reduced greenhouse gas emissions. A three-year (2006-2008) fiel. experiment was conducted at Star City, Saskatchewan, Canada, to compare the effects of l.nd-appl.ed anaerobical.y digested swine manure (ADSM), conventional.y treated swine manure (CTSM) and N fertil.zer on grain yiel. of barl.y, appl.ed N use efficiency (ANUE, kg·grain·kg-1 of appl.ed N·ha-1), ammonia (NH3) vol.til.zation and nitrous oxide (N2O) emissions. Treatments incl.ded spring and autumn appl.cations of CTSM and ADSM at a 1x rate (10,000 and 7150 l.ha-1, respectivel.) appl.ed every year, a 3x rate (30,000 and 21,450 l.ha-1, respectivel.) appl.ed once at the beginning of the experiment, pl.s a treatment receiving commercial.fertil.zer (UAN at 60 kg·N·ha-1·yr-1) and a zero-N control. There was a significant grain yiel. response of barl.y to appl.ed N in al. three years. The ANUE of ADSM or CTSM appl.ed once at the 3x rate were l.wer than annual.appl.cations at the 1x rate (grain yiel. by 595 kg·ha-1 and NFUE by 6 kg·grain·kg-1 of appl.ed N·ha-1). On average, agronomic performance of ADSM was simil.r to CTSM. The APNU of N fertil.zer was greater than the 3x rate but l.wer than the 1x rate of ADSM or CTSM. Ammonia l.ss from ADSM was simil.r to CTSM, except for much higher l.ss of NH3-N from CTSM at the 3x rate appl.ed in the autumn (8100 g·N·ha-1) compared to the other treatments (1100 - 2600 g·N·ha-1). The percentage of appl.ed N l.st as N2O gas was general.y higher for treatments receiving CTSM (4.0%) compared to ADSM (1.4%). In concl.sion, the findings suggest that ADSM is equal.or sl.ghtl. better than CTSM in terms of agronomic performance, but has l.wer environmental.impact.

关键词： Ammonia Vol.til.zation Anaerobic Digestion Barl.y Yiel. Nitrogen Fertil.zer Use Efficiency Nitrous Oxide Swine Manure

Airborne Sensor Network for Atmospheric Profil.ng

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wirel.ss Sensor Network 2018年第4期10卷 93-101页

作者： Tyl.r Horton Michael.Bol. Craig Prather John Manobianco mark l. Adams Department of El.ctrical.and Computer Engineering Auburn University Auburn AL USA

The need for higher spatial.temporal.resol.tion in-situ atmospheric sensing has been establ.shed by both weather and cl.mate researchers. In order to address this need, an airborne wirel.ss sensor network cal.ed Gl.bal.ense is currentl. being devel.ped. Gl.bal.ense is based on l.w-cost airborne probes that col.ect environmental.data as they fal. sl.wl. through the atmosphere and on portabl. base stations that receive the data being col.ected. This paper presents an overview of this Gl.bal.ense system as wel. as prel.minary resul.s from ground-based system testing.

关键词： Biomimetic Airborne Atmospheric Sensing