维普中文期刊产品整合服务
857篇 您的检索式:作者名="Idris"
    题名 作者 年代 出处 被引量
1帕博利珠单抗单用或与放疗联用治疗转移性非小细胞肺癌:两个随机试验的汇总分析显示文摘背景放疗可以提高整个机体对免疫治疗的应答。在Ⅱ期PEMBRO-RT研究和Ⅰ/Ⅱ期MDACC研究中,患有转移性非小细胞肺癌(NSCLC)的患者被随机分配入组,接受免疫治疗(帕博利珠单抗)+放疗联合疗法,或免疫治疗单一疗法。当上述2个研究单独分析时,联合疗法组显示出潜在获益。由于每个研究的样本量较小,缓解率和结局并未显示出统计学意义,然而却有显著的临床获益。因此,本研究进行汇总分析,来判断放疗是否会改善转移性NSCLC患者的免疫治疗应答。方法PEMBRO-RT和MDACC研究纳入标准:患者年龄≥18岁,患有转移性NSCLC,且有≥1处未经放疗照射的病灶,以便进行射野外应答监测。PEMBRO-RT研究纳入曾接受过化疗患者,MDACC研究纳入曾接受过治疗或新诊断患者。2个研究中的患者均未接受过免疫治疗。在PEMBRO-RT研究中患者被等比例随机分配入组,并根据吸烟状态进行分层(分为<10年组和≥10年组)。MDACC研究的患者根据放疗计划可行性被等比例随机分配入2个受试组。由于联合治疗组的干预本质,每个研究中的放疗均不适用盲法。在2个研究中,不论是否进行放疗,均静脉滴入帕博利珠单抗(每3周200 mg)。在PEMBRO-RT研究中,在放疗(24 Gy 3次分割照射)结束后1周给予第1剂帕博利珠单抗。在MDACC研究中,在第1次放疗(50 Gy 4次分割照射或45 Gy 15次分割照射)同时给予帕博利珠单抗。仅检测未经照射病灶的应答。本研究的终点为最佳射野外(远隔)应答率(ARR)、最佳射野外疾病控制率(ACR)、12周时ARR、12周时ACR、无进展生存期(PFS)和总生存期(OS)。2个研究的意向治疗(ITT)人群均纳入分析。PEMBRO-RT研究(NCT02492568)和MDACC研究(NCT02444741)均在ClinicalTrials.gov上注册。发现纳入148例患者,76例接受帕博利珠单抗治疗,72例接受帕博利珠单抗+放疗治疗。所有患者随访时间中位数为33个月[四分位距(IQR):32.4~33.6]。148例患者中124例(84%)组织学特征为非鳞癌,111例(75%)患者曾经接受过化疗。组间没有基线特征差异,包括PD-L1表达状态和转移灶体积。最常见的照射部位为肺转移灶(39%,28/72)、胸腔内淋巴结(21%,15/72)和非原发灶(17%,12/72)。帕博利珠单抗组和联合治疗组的最佳ARR分别为19.7%(15/76)和41.7%(30/72),OR=2.96,95%CI:1.42~6.20,P=0.0039;最佳ACR分别为43.4%(33/76)和65.3%(47/72),OR=2.51,95%CI:1.28~4.91,P=0.0071;PFS中位数分别为4.4(IQR:2.9~5.9)和9.0个月(IQR:6.8~11.2),HR=0.67,95%CI:0.45~0.99,P=0.045;OS中位数分别为8.7(IQR:6.4~11.0)和19.2个月(IQR:14.6~23.8),OR=0.67,95%CI:0.54~0.84,P=0.0004。在汇总分析中没有发现新的安全问题。解读帕博利珠单抗免疫疗法+放疗显著提高转移性NSCLC患者的应答和改善治疗结局。这些结果需要在三期临床试验中进行验证。陈大卫(翻译) 于金明(校对) Willemijn S M E Theelen Vivek Verma Brian P Hobbs Heike M U Peulen Joachim G J V Aerts Idris Bahce Anna Larissa N Niemeijer Joe Y Chang Patricia M de Groot Quynh-Nhu Nguyen Nathan I Comeaux George R Simon Ferdinandos Skoulidis Steven H Lin Kewen He Roshal Patel John Heymach Paul Baas James W Welsh 2021中华肿瘤防治杂志2021,28,24:49
2Phylogenetic relationships of native and introduced Bemisia tabaci (Homoptera:Aleyrodidae) from China and India based on mtCOI DNA sequencing and host plant comparisons显示文摘Phylogenetic relationships for Bemisia tabaci were reconstructed by analysis of a ~780 bp fragment of the mitochondrial cytochrome oxidase I (mtCOI) gene with an emphasis on geographic range and distribution among eight eudicot plant families that are common hosts of B. tabaci worldwide to elucidate key phylogeographic linkages between populations extant in China (n=31) and India (n=34). Bootstrap values for the Maximum Parsimony tree were highly robust for all major nodes involving the major Asian clade, subgroups, and sister groups within, at 92%—100%. Between-clade distances for the Southeast Asia and three other major clades, e.g. from sub-Sahara Africa, North Africa-Mediterranean, and the Americas, were approximately >16% divergent. Two major Asian subgroups (I, II) were resolved, which represented populations indigenous to the region, comprising two (I a, I b) and five (II a—e) sister groups, respectively, which diverged by 11%. Two distinct populations from sunflower in Hyderabad grouped separately within the two Asian subgroups. All other populations grouped uniquely within Asian subgroup II or I. The 'B' biotype was identified in 23 collections from China at 97.3%—99.5% nucleotide identity with 'B' biotype reference sequences; it was not identified in collections from India. The majority of haplotypes were associated with 3—4 plant families, with one exception that for sister group IId (sesame, India), it might be monophagous. Thus, B. tabaci from the southeastern and near eastern regions of the Asian continent comprise of a large number of ancestral, richly divergent, mostly polyphagous populations. This region is therefore hypothesized to constitute an important Old World center of diversification for the B. tabaci complex, together with sub-Saharan Africa.Qiu Baoli Susan A. Coats Ren Shunxiang Ali M. Idris Xu Caixia Judith K. Brown 2007Progress in Natural Science:Materials International2007,17,6:15
3Bulk and bubble-scale experimental studies of influence of nanoparticles on foam stability显示文摘Influence of silicon oxide(SiO_2) and aluminum oxide(Al_2O_3) nanoparticles on the stability of nanoparticles and sodium dodecyl sulfate(SDS) mixed solution foams was studied at bulk and bubble-scale. Foam apparent viscosity was also determined in Hele-Shaw cell In order to investigate the foam performance at static and dynamic conditions. Results show that the maximum adsorption of surfactant on the nanoparticles occurs at 3 wt% surfactant concentration. Foam stability increases while the foamability decreases with the increasing nanoparticle concentration. However, optimum nanoparticle concentration corresponding to maximum foam stability was obtained at 1.0 wt% nanoparticle concentration for the hydrophilic SiO_2/SDS and Al_2O_3/SDS foams. Foam performance was enhanced with increasing nanoparticles hydrophobicity. Air-foams were generally more stable than CO_2 foams.Foam apparent viscosity increased in the presence of nanoparticles from 20.34 mPa·s to 84.84 mPa·s while the film thickness increased from 27.5 μm to 136 μm. This study suggests that the static and dynamic stability of conventional foams could be improved with addition of appropriate concentration of nanoparticles into the surfactant solution. The nanoparticles improve foam stability by their adsorption and aggregation at the foam lamellae to increase film thickness and dilational viscoelasticity. This prevents liquid drainage and film thinning and improves foam stability both at the bulk and bubble scale.Nurudeen Yekeen Ahmad Kamal Idris Muhammad A.Manan Ali Mohamed Samin Abdul Rahim Risal Tan Xin Kun 2017Chinese Journal of Chemical Engineering2017,25,3:9
4Bi和Sr改性Al-7Si-0.4Mg合金显微组织的影响(英文)显示文摘研究单独添加Bi和联合添加Bi与Sr在不同凝固条件下对Al-7Si-0.4Mg合金中共晶硅结构的影响。结果表明:添加Bi对共晶硅有细化作用,其细化能力随着Bi质量分数(在<0.5%范围内)的增加而增强。当Bi添加到Sr改性的合金中时,为了得到充分的共晶硅改性,较高的Sr/Bi质量比(至少0.45)是必要的。S. FARAHANY A. OURDJINI M. H. IDRIS L. T. THAI 2011Transactions of Nonferrous Metals Society of China2011,21,7:7
5Effect of Primary and Eutectic Mg_2Si Crystal Modifications on the Mechanical Properties and Sliding Wear Behaviour of an Al–20Mg_2Si–2Cu–xBi Composite显示文摘This work investigated the microstructure evolution, tensile, impact, hardness, and sliding wear properties of an Al–20Mg_2Si–2Cu in situ composite treated with different Bi contents. The desired modification of primary Mg_2 Si particles was achieved with the addition of 0.4 wt% Bi. Increasing Bi beyond 0.4 wt%resulted in a loss of modification, possibly due to the formation of Al_8 MgB iS i4 compound before the precipitation of the primary Mg_2 Si. Additionally, the structure of the pseudo-eutectic Mg_2 Si was transformed from plate to fibrous, which was consistent with decrease of growth temperature extracted from the cooling curve thermal analysis. Addition of Bi had an effect on the morphology of Al_5 Fe Si(β), Al_2Cu(θ) and Al_5Cu_2Mg_8Si_6(Q) intermetallic compounds. The tensile strength, elongation percentage, impact toughness, and hardness increased by 6%, 13%, 75%, and 23%, respectively, due to modification of both the primary and eutectic Mg_2 Si crystals. The tensile and impact fracture surfaces showed fewer decohered particles in the Bi-treated composite. The enhancement in wear resistance of the Bi-treated composite could be attributed to solid lubricant function of insoluble soft Bi phase and modification effects on Mg_2 Si particles.Saeed Farahany Hamidreza Ghandvar Nur Azmah Nordin Ali Ourdjini Mohd Hasbullah Idris 2016Journal of Materials Science & Technology2016,32,11:7
616例脑结核瘤抗结核治疗系列观察显示文摘目的:报告16例颅内结核瘤患者的临床、影像学表现及抗结核治疗的结果。设计:本文共纳入苏丹Khartoun市全国神经系统疾病中心连续观察的16例脑结核瘤患者。诊断则依据其临床、头颅影像学特征及对抗结核治疗有效等方面。本组中共有7例具有脑组织或脑外组织的病理组织学资料。结果与结论:本组病例最常见的临床表现是头痛(100%)、全身性抽搐(68.7%)及偏瘫(56.2%)。头颅横断面电子计算机体层摄影(CT)/核磁共振成像(MRI)显示单个或多个明显增强的病变及病灶周围水肿。经抗结核治疗后,多数存活患者(13/15)病变完全吸收。病变部分吸收与就诊延迟、颅内多个大病灶及晚期粟粒性结核病有关。我们主张对颅内结核瘤,即使是拟诊病例,应早期经验性试用抗结核治疗,尤其在结核病高发地区。M. N. A. Idris T-E. O. Sokrab M. A. R. Arbab A. E. M. Ahmed H. El Rasoul S. Ali M. A. Elzubair S. M. Mirgani 马玙(译) 杨振旦(校) 张立兴(审) 2007国际结核病与肺部疾病杂志2007,2,1:6
7Unexpected complication of arteriovenous fistula of the left common carotid to internal jugular vein following central venous catheterization显示文摘Incidence of inadvertent arterial puncture secondary to central venous catheter insertion is not common with an arterial puncture rate of<1%.This is due to the advancements and wide availability of ultrasound to guide its insertion.Formation of arteriovenous fistula after arterial puncture is an unexpected complication.Till date,only five cases(including this case)of acquired arteriovenous fistula formation has been described due to inadvertent common carotid puncture.The present case is a 26-year-old man sustained traumatic brain injuries,chest injuries and multiple bony fractures.During resuscitative phase,attempts at left central venous catheter via left internal jugular vein under ultrasound guidance resulted in inadvertent puncture into the left common carotid artery.Surgical neck exploration revealed that the catheter had punctured through the left internal jugular vein into the common carotid artery with formation of arteriovenous fistula.The catheter was removed successfully and common carotid artery was repaired.Postoperatively,the patient recovered and clinic visits revealed no neurological deficits.From our literature review,the safest method for removal is via endovascular and open surgical removal.The pull/push technique(direct removal with compression)is not recommended due to the high risk for stroke,bleeding and hematoma formation.Tan Chor Lip Henry Tan Jih Huei Mohamad Yuzaidi Lenny Suryani Safri K.Krishna Imran Alwi Rizal Md Idris Mohamad Azim Hanafiah Harunarashid 2020Chinese Journal of Traumatology2020,23,1:5
8涂层厚度对消失模铸Al-Si-Cu合金铸件的影响(英文)显示文摘对Al-Si-Cu合金进行消失模铸造,研究涂层厚度对Al-Si-Cu合金铸件缺陷、孔隙率和共晶硅间距的影响。结果表明,提高涂层浆料黏度和延长浸渍时间对铸件的完整性和显微组织有影响。薄的涂层有利于模腔充填性能的改善、显微组织的细化和低孔隙度高质量铸件的获得。Majid KARIMIAN Ali OURDJINI Mohd HASBULLAH IDRIS Hassan JAFARI 2012Transactions of Nonferrous Metals Society of China2012,22,9:5
9Mechanical properties of stabilized zirconia nanocrystalline EB-PVD coating evaluated by micro and nano indentation显示文摘Yttria-stabilized zirconia(YSZ)thin nanocrystalline coatings at different substrate preheating temperatures were deposited via electron beam-physical vapour deposition(EB-PVD).Nanocrystalline ZrO_(2)-Y_(2)O_(3) was deposited on the bond coat in order to compensate for the coefficient of thermal expansion(CTE),which can be functionalized as a thermal barrier coating(TBC).The aim of this study was to evaluate mechanical properties with respect to adhesion of zirconia nanocrystalline’s top ceramic layer to the interfacial bond coat by utilizing micro and nano indentation tests.In the present paper,the structural studies were carried out using X-ray diffraction(XRD)analysis of coating content(8 mol%of Y_(2)O_(3)).The tetragonal phase of stabilized zirconia was observed.Field emission scanning electron microscopy(FESEM)and atomic force microscopy(AFM)were employed to characterize the coatings’morphology and microstructure.The mechanical behavior of ZrO_(2)-Y_(2)O_(3) thin films under point loading conditions was studied by nanoindentation using a Berkovich indenter with 130 nm tip radius.Therefore,adhesion of top coat to the interfacial underlying metallic bond coat known as MCrAlY(M=Ni,Co)was estimated according to the highest peak load tests;for a 120 mN peak load,the film manifested tolerable adhesion properties.Moreover,nanoindentation of ZrO_(2)-Y_(2)O_(3) nanostructure deposited at 1050℃substrate preheating temperature produced the highest hardness value of about 21.7 GPa.Vickers micro hardness was utilized with the aid of the Tabor equation in order to achieve deeper insight into the correlation between adhesion and deposition process parameters.Meysam KESHAVARZ Mohd Hasbullah IDRIS Norhayati AHMAD 2013Journal of Advanced Ceramics2013,2,4:4
10环境因素对户用光伏板发电效率的影响显示文摘光伏发电系统在单体建筑中被越来越广泛地使用,但是在实际运行条件下,他们的性能得不到理想的发挥,例如环境温度、风速和太阳辐照度等环境因素对户用光伏面板的效率有着重要影响。对位于中国甘肃省武威市民勤县的一座单体建筑在冬季供暖期间进行光伏发电系统试验研究,该试验测试用于量化户用光伏面板的性能和运行特性。试验结果表明,该光伏面板的最大效率为14.75%,最小效率为11.52%;效率最大平均值为13.82%,最小平均值为12.78%。Yassir Idris Abdalla Osman 李金平 甄箫斐 蒋琴 张东 杨捷媛 2019中国农机化学报2019,40,3:4
11影响消失模铸造Al-Si-Cu合金薄壁铸件质量的显著性工艺参数(英文)显示文摘通过控制消失模铸造工艺参数可以制备出无缺陷的形状复杂的铸件产品。对Al-Si-Cu合金消失模铸造进行研究,考察浇注温度、涂料黏度、振动时间、型砂粒径以及它们之间的交互作用对铸件表面质量、孔隙率和共晶硅间距的影响。采用两水平全因子实验设计方法考察影响铸件性能的显著性影响工艺参数。结果表明,浇注温度和振动时间对铸件共晶硅间距和孔隙率的影响最明显。在细型砂模和较高的浇注温度下,铸件的表面质量几乎保持稳定不变,而在粗型砂模下铸件的表面质量较低。涂料黏度对铸件性能没有显著影响。Hassan JAFARI Mohd Hsbullah IDRIS Amirreza SHAYGANPOUR 2013Transactions of Nonferrous Metals Society of China2013,23,10:4
12旁观者目击与心肺复苏对成人院外心跳骤停预后的影响显示文摘目的:探讨旁观者目击与心肺复苏(CPR)对成人院外心脏骤停(OHCA)预后的真实影响。方法:以北美复苏终点联盟纳入PRIMED研究的成年心源性OHCA共11875例为研究对象,运用Logistic回归评价旁观者目击和旁观者CPR对成年心源性OHCA预后的影响。结果:旁观者目击较无旁观者目击OHCA在院前自主循环恢复、存活出院、出院时良好神经功能恢复等预后指标上明显改善;旁观者CPR可明显改善旁观者目击OHCA院前自主循环恢复、存活出院和出院时良好神经功能恢复;但对未被目击OHCA,旁观者CPR对存活出院和良好神经功能恢复的改善无统计学差异。结论:旁观者目击和CPR显著改善OHCA预后,但对无旁观者目击OHCA实施CPR对预后无显著改善效应。文隽永 廖瑾莉 蒋龙元 熊艳 Ahamed Idris 2017岭南急诊医学杂志2017,22,6:4
13Relationship between the corrosion behavior and the thermal characteristics and microstructure of Mg–0.5Ca– x Zn alloys显示文摘H.R. Bakhsheshi-Rad M.R. Abdul-Kadir M.H. Idris S. Farahany 2012Corrosion Science2012,,:3
14固溶处理对可生物降解Mg-6Zn合金腐蚀性能的影响(英文)显示文摘对可生物降解二元Mg-6Zn合金进行固溶处理,来评价获得的显微组织变化对合金降解速率的影响及其相关机理。在350°C条件下固溶处理6-48 h。采用光学显微镜、扫描电镜、能量色散X射线光谱仪和X射线衍射仪分析铸态和固溶处理后试样。在37°C的模拟体液中进行浸泡和电化学测试,评价其抗腐蚀性。为保证腐蚀测试的结果,对p H值进行测试。结果发现,大于24 h的固溶处理,金属间化合物相溶解于基体中,并产生了近单晶相组织。金属间化合物相的减少导致阴极区/阳极区比减小且腐蚀率降低。电化学和失重测试结果表明,延长固溶处理时间可提高合金的抗腐蚀性。经350°C固溶处理24 h后,铸态合金的抗腐蚀性提高了60%以上。另外,逐渐减少的金属间化合物相和伴随的低p H值上升,降低了腐蚀速率。对于Mg-Zn合金作为生物可降解移植材料的应用,固溶处理是一种可以提高腐蚀性的工艺。Seyed Morteza Ghaffari SHAHRI Mohd Hasbullah IDRIS Hassan JAFARI Babak GHOLAMPOUR Mahtab ASSADIAN 2015Transactions of Nonferrous Metals Society of China2015,25,5:3
15Recent advances in application of moving bed bioreactors for wastewater treatment from recirculating aquaculture systems: A review显示文摘In recent years,government investments in implementing restrictive public policies on the treatment and discharge of effluents from the aquaculture industry have increased.Hence,efficient and cleaner methods for aquaculture production are needed.Recirculating aquaculture systems(RAS)offers water conservation by recycling the treated aquaculture water for reuse.RAS wastewater treatment using a moving bed bioreactors(MBBRs)process has been considered well suited for maintaining good water quality,thereby making fish farming more sustainable.Currently,improvements were achieved in tackling the influence of salinity,organic matter,disinfectant,and bioreactor start-up process on the MBBR performance efficiency.This review highlights an updated overview of recent development made using MBBR to treat the residual water from RAS.Precisely,nitrification and simultaneous nitrification-denitrification(SND),and other hybrid processes for nitrogen removal were elucidated.Finally,future challenges and prospects of MBBRs in RAS facilities that need to be considered were also proposed.Abubakar Shitu Gang Liu Aliyu Idris Muhammad Yadong Zhang Musa Abubakar Tadda Wanhe Qi Dezhao Liu Zhangying Ye Songming Zhu 2022Aquaculture and Fisheries2022,7,3:3
16氟化处理对植入材料Mg-Ca二元合金腐蚀行为的影响(英文)显示文摘在室温下,将Mg-0.5Ca合金在不同浓度的氢氧化钠和HF溶液浸渍不同的时间,研究HF处理对合金腐蚀行为的影响。采用原子力显微镜、X射线衍射、场发射扫描电子显微镜表征样品的微观组织变化。通过动电位极化和Kokubo溶液浸泡试验测试样品的耐腐蚀性。结果表明,与35%HF处理的样品相比,经40%HF溶液处理的Mg-0.5Ca合金具有更均匀、更致密、更薄的涂层(12.6μm)。电化学测试表明,在Kokubo溶液中,经氟化物处理的Mg-0.5Ca合金样品的耐腐蚀性比未处理样品的高35倍;前者的体外降解速率远远低于后者的。在40%HF溶液处理过的样品表面只出现了一些腐蚀点,而未经处理的样品完全被腐蚀产物覆盖且出现了分层现象。40%HF处理的Mg-0.5Ca合金,具有低的降解速率和良好的生物相容性,是一种有潜力的植入材料。Hamid Reza Bakhsheshi-Rad Mohd Hasbullah Idris Moha mmed Rafiq Abdul Kadir Mohammadreza Daroonparvar 2013Transactions of Nonferrous Metals Society of China2013,23,3:3
17Human parvovirus B19-associated hematopathy in HIV disease:need for clinicopathological revisit显示文摘Persons living with HIV infection occasionally suffer from anemia due to varying causes.These include the use of zidovudine,malnutrition especially vitamin B12and iron deficiency,opportunistic infections by Mycobacterium tuberculosis,Pneumocystis jiroveci,and direct hematological effects of HIV infection itself within the marrow microenvironment.Persistent Parvovirus B19(B19V)infection is a clinically important and treatable etiology of anemia in HIV-infected persons.B19V is known to show singular tropism andIdris Abdullahi Nasir Jessy Thomas Medugu Amos Dangana 2018The Journal of Biomedical Research2018,32,1:3
18Wavelet Based Image Authentication and Recovery显示文摘In this paper,we propose a secure senti-fragile watermarking technique based on integer wavelet transform with a choice of two watermarks to be embedded.A self-recovering algorithm is employed,that hides the image digest into some wavelet subbands for detecting possible illicit object manipulation undergone in the image.The semi-fragility makes the scheme tolerant against JPEG lossy compression with the quality factor as low as 70%,and locates the tampered area accurately.In addition,the system ensures more security because the embedded watermarks are protected with private keys.The computational complexity is reduced by using parameterized integer wavelet transform.Experimental results show that tile proposed scheme guarantees safety of a watermark,recovery of image and localization of tampered area.Rafiullah Chamlaw Asifullah Khan Adnan Idris 2007Journal of Computer Science & Technology2007,22,6:3
19Blast-induced ground vibration prediction in granite quarries:An application of gene expression programming,ANFIS,and sine cosine algorithm optimized ANN显示文摘Blasting of rocks has intrinsic environmental impacts such as ground vibration,which can interfere with the safety of lives and property.Hence,accurate prediction of the environmental impacts of blasting is imperative as the empirical models are not accurate as evident in the literature.Therefore,there is need to consider some robust predictive models for accurate prediction results.Gene expression programming(GEP),adaptive neuro-fuzzy inference system(ANFIS),and sine cosine algorithm optimized artificial neural network(SCA-ANN)models are proposed for predicting the blast-initiated ground vibration in five granite quarries.The input parameters into the models are the distance from the point of blasting to the point of measurement(D),the weight of charge per delay(W),rock density(q),and the Schmidt rebound hardness(SRH)value while peak particle velocity(PPV)is the targeted output.100 datasets were used in developing the proposed models.The performance of the proposed models was examined using the coefficient of determination(R2)and error analysis.The R2 values obtained for the GEP,ANFIS,and SCA-ANN models are 0.989,0.997,and 0.999,respectively,while their errors are close to zero.The proposed models are compared with an empirical model and are found to outperform the empirical model.Abiodun Ismail Lawal Sangki Kwon Olaide Sakiru Hammed Musa Adebayo Idris 2021International Journal of Mining Science and Technology2021,31,2:3
20Delonix regia and Casuarina equisetifolia as passive biomonitors and as bioaccumulators of atmospheric trace metals显示文摘The suitability of two common and ubiquitously distributed and exotic ornamental plant species in Nigeria-Delonix regia and Casuarina equisetifolia as biomonitors and as effective bioaccumulators of atmospheric trace metals(Cd,Pb,Zn and Cu) has been evaluated.Bark and leaf samples from these plant species were collected in June and July 2006 at five locations in Benin City.Four of the sampling sites were in areas of high traffic density and commercial activities,the fifth site is a remote site,selected to act as a control and also to provide background information for the metals.The plant samples were collected and processed using standard procedures and trace metals were determined using atomic absorption spectrometer.The bark of the plants was able to bioaccumulate the trace metals,especially Pb which originates from anthropogenic contributions in the city.The Pb range of 20.00-70.00 μg/g measured for the bark samples of D.regia,exceeded the normal plant Pb concentration of 0.2-20.0 μg/g and most Pb data available in literature.The bark of the plants was observed to accumulate more metals compared to the leave,while D.regia was found to be slightly better than C.equisetifolia in trace metal uptake efficiency.Spatial variations in the distributions of Pb and Zn were significant(p < 0.05),and the continuous use of leaded fuel in Nigeria was identified as the predominant source of Pb in the atmosphere.Emmanuel Ehiabhi Ukpebor Justina Ebehirieme Ukpebor Emmanuel Aigbokhan Idris Goji Alex Okiemute Onojeghuo Anthony Chinedum Okonkwo 2010Journal of Environmental Sciences2010,22,7:2
返回顶部 每页显示:
共43页 首页 上一页 第1页 下一页 末页 /43 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费