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Assessment of Metals Concentration and Ecotoxicology of the Sediment Core of Rehri Creek, Karachi Coast, Pakistan

Acta Geologica Sinica(English Edition) 2013年第5期87卷 1434-1443页

作者： muhammad z. chaudhary Nasir AHMAD Az.ar MASHIATULLAH Sajjad MUNIR Tariq JAVED Isotope Application Division Pakistan Institute of Nuclear Science and Technology (PINSTECH) Institute of Geology University of the Punjab Department of Earth & Environmental Sciences Bahria University Islamanad

Trace metal concentrations were investigated in a recent sediment core collected from the Rehri Creek area of the Karachi coast, Sindh - Pakistan. The core was sliced horiz.ntally at 2.5-cm intervals to determine grain siz., sediment composition, pH, organic matter, and acid-leachable trace metals： cadmium, chromium, copper, lead, and z.nc. The trace metals were analyz.d by ICP. To separate anthropogenic from geogenic input, several approaches were made, including comparison with sediment quality guidelines--ecotoxicological sense of heavy metal contamination and classification by quantitative indexes. Grain-siz. analysis and sediment composition of core sample show a sandy nature with neutral pH. Elemental sequence （ES） of the trace metals is in the order of z. （19.2-109.56 ppm）〉 Si （66.46-101.71 ppm）〉 Ba （12.05-26.86 ppm）〉 As （8.18-17.36 ppm）〉 Ni （4.2- 14.69 ppm）〉 Cr （3.02-9.62 ppm）〉 Pb （2.79-6.83 ppm）〉 Cu （2.2-5.29 ppm）〉 Co （0.9-2.05 ppm）. Thus it is likely that the area may face a serious threat of metal pollution with the present deposition rates unless stringent pollution control norms are adopted. The Sediment Geo-accumulation Index shows that there is no Cr, Cu, Ni, Pb, z., or Fe pollution; however, the former index and the Pollution Load Index indicate arsenic pollution in the sediments.

关键词： trace elements lake sedimentation sediment quality guidelines pollution shale values

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Automatic and Manual Proliferation Rate Estimation from Digital Pathology Images

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Journal of Software Engineering and Applications 2015年第6期8卷 269-275页

作者： Lama Rajab Heba z. Al-Lahham Raja S. Alomari Fatima Obaidat Vipin chaudhary The University of Jordan Amman Jordan The University at Buffalo Buffalo USA

Digital pathology is a major revolution in pathology and is changing the clinical routine for pathologists. We work on providing a computer aided diagnosis system that automatically and robustly provides the pathologist with a second opinion for many diagnosis tasks. However, inter-observer variability prevents thorough validation of any proposed technique for any specific problems. In this work, we study the variability and reliability of proliferation rate estimation from digital pathology images for breast cancer proliferation rate estimation. We also study the robustness of our recently proposed method CAD system for PRE estimation. Three statistical significance tests showed that our automated CAD system was as reliable as the expert pathologist in both brown and blue nuclei estimation on a dataset of 100 images.

关键词： Prolifiration Rate Estimation (PRE) Digital Pathology Interobserver Variability

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日粮中添加硒和维生素E对肉鸡免疫系统的影响

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饲料研究 2013年第3期36卷 31-32页

作者： M.I.Hussain S.A.Khan z.I.chaudhary A.Aslam K.Ashraf M.F.Rai 黄鑫戴晋军李彪谭斌李春松安琪酵母股份有限公司动物营养事业部

试验旨在研究有机硒、无机硒及维生素E对肉鸡免疫系统的影响。试验选用130只1日龄肉鸡分为3个组,其中A和B组为试验组,各60只鸡,C组为对照组,10只鸡。A组日粮中添加有机硒和维生素E,A组又细分为A1、A2、A3、A4、A5和A6组,其中有机硒的添... 详细信息

试验旨在研究有机硒、无机硒及维生素E对肉鸡免疫系统的影响。试验选用130只1日龄肉鸡分为3个组,其中A和B组为试验组,各60只鸡,C组为对照组,10只鸡。A组日粮中添加有机硒和维生素E,A组又细分为A1、A2、A3、A4、A5和A6组,其中有机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。B组日粮中添加无机硒和维生素E,也分为B1、B2、B3、B4、B5和B6组,其中无机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。C组为对照组,饲料中不添加硒和维生素E。检测指标包括新城疫病毒(HI)抗体滴度、免疫器官的病理变化、免疫器官指数和生长性能。试验结果表明,日粮中加入有机硒后,能提高肉鸡免疫力,效果优于添加无机硒;同时,硒与维生素E配合使用的效果优于单一添加硒。

关键词：硒维生素E 肉鸡免疫系统免疫器官

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*** attentional allocation during visual search in the presence of an artificial scotoma in younger and older adults

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Annals of Eye Science 2018年第1期 466-466页

作者： Anne-Sophie Laurin Trang Tran Gunnar Blohm Laure Pisella Aarlenne z.Khan Department of Neuroscience Universitéde MontréalQCCanada Department of Psychology Universitéde MontréalQCCanada ImpAct Centre de Recherche en Neurosciences de LyonFrance École d’Optométrie Universitéde MontréalQCCanada

Background:Age related macular degeneration(AMD)is one of the main causes of vision loss in older adults,generating,in most cases,a central scotoma that reduces central visual acuity(Noble&chaudhary,2010).People affected by AMD have to rely on peripheral visual information and would highly benefit from efficiently allocating their attention to the ***,attention can improve peripheral spatial resolution(Carrasco,Ling&Read,2004)and can be allocated to a certain expanse of space outside of the central visual span,known as the attentional *** span has been shown to be decreased in people with AMD with less attention allocated to the periphery and more to the central visual field(Cheong et al.,2008),however it remains unknown whether aging is also a contributing ***:Fourteen healthy younger(mean age=21.8 years,SD=1.5)and 8 older adults(mean age=69.6 years,SD=7.3)performed a pop-out and a serial version of a visual search task,in the presence of different siz.d gaz.-contingent invisible and visible artificial central scotomata(no scotoma,3°diameter,5°and 7°).Participants were asked to indicate as quickly as possible whether a target was present or not among distractors whose number varied(16,32 or 64 objects).We wished to determine whether the siz. of the scotoma,occluding different degrees of central vision,affected visual search differently for younger *** ***:Both the younger and older participants showed higher reaction times(RTs)to find the target for the serial version(M=2,074 ms for younger adults,M=3,853 ms for older adults)compared to the pop-out version(M=866 ms,M=1,475 ms,Pz. on older adults(3°scotoma M=3,276 ms;7°scotoma M=3,877 ms,P<0.05),however,accurate performance was higher wit

关键词： Visual attention scotoma visual search

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