检索结果-南通市图书馆

Simultaneous removal of ammonia and N-nitrosamine precursors from high ammonia water by zeolite and powdered activated carbon

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第2期30卷 82-91页

作者： Runmiao Xue Ariel Donovan Haiting Zhang Yinfa ma Craig Adams John Yang Bin Hua Enos Inniss todd Eichholz Honglan Shi Department of Chemistry and Environmental Research Center Missouri University of Science and Technology RoIIa MO 65409 USA Center for Single Nanoparticle Single Cell and Single Molecule Monitoring (CS3M) Missouri University of Science and Technology RollaMO 6S409 USA Department of Civil Engineering Saint Louis University St. Louis MO 63103 USA Department of Agriculture and Environmental Sciences Lincoln University of Missouri Jefferson City MO 65101 USA Department of Civil & Environmental Engineering University of Missouri-Columbia Columbia MO 65211 USA Missouri Department of Natural Resources Jefferson City MO 65102 USA

When adding sufficient chlorine to achieve breakpoint chlorination to source water containing high concentration of ammonia during drinking water treatment, high concentrations of disinfection by-products（DBPs） may form. If N-nitrosamine precursors are present, highly toxic N-nitrosamines, primarily N-nitrosodimethylamine（NDma）, may also form. Removing their precursors before disinfection should be a more effective way to minimize these DBPs formation. In this study, zeolites and activated carbon were examined for ammonia and N-nitrosamine precursor removal when incorporated into drinking water treatment *** test results indicate that Mordenite zeolite can remove ammonia and five of seven N-nitrosamine precursors efficiently by single step adsorption test. The practical applicability was evaluated by simulation of typical drinking water treatment processes using six-gang stirring system. The Mordenite zeolite was applied at the steps of lime softening, alum coagulation, and alum coagulation with powdered activated carbon（PAC） sorption. While the lime softening process resulted in poor zeolite performance, alum coagulation did not impact ammonia and N-nitrosamine precursor removal. During alum coagulation, more than67% ammonia and 70%–100% N-nitrosamine precursors were removed by Mordenite zeolite（except 3-（dimethylaminomethyl）indole（DmaI） and 4-dimethylaminoantipyrine（DmaP））. PAC effectively removed DmaI and DmaP when added during alum coagulation. A combination of the zeolite and PAC selected efficiently removed ammonia and all tested seven N-nitrosamine precursors（dimethylamine（Dma）, ethylmethylamine（Ema）, diethylamine（DEA）, dipropylamine（DPA）, trimethylamine（Tma）, DmaP, and DmaI） during the alum coagulation process.

关键词： Disinfection by-products Drinking water treatment Ammonia removal by zeolite N-nitrosodimethylamine(NDma) N-nitrosamines N-nitrosamine precursor removal by zeolite and powdered activated carbon

Locomotor analysis identifies early compensatory changes during disease progression and subgroup classification in a mouse model of amyotrophic lateral sclerosis

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2017年第10期12卷 1664-1679页

作者： Melissa M.Haulcomb Rena M.Meadows Whitney M.Miller Kathryn P.Mc Millan Me kenzie J.Hilsmeyer Xuefu Wang Wesley T.Beaulieu Stephanie L.Dickinson todd J.Brown Virginia M.Sanders Kathryn J.Jones Department of Anatomy and Cell Biology Indiana University School of MedicineIndianapolisINUSA Research and Development Service Roudebush Veterans Administration Medical CenterIndianapolisINUSA Program in Medical Neurosciences Indiana University School of MedicineIndianapolisINUSA Department of Statistics Indiana UniversityBloomingtonINUSA Department of Epidemiology and Biostatistics Indiana UniversityBloomingtonINUSA Department of Cancer Biology and Genetics The Ohio State University Wexner Medical CenterColumbusOHUSA

Amyotrophic lateral sclerosis is a motoneuron degenerative disease that is challenging to diagnose and presents with considerable variability in *** identification and enhanced understanding of symptomatic patterns could aid in diagnosis and provide an avenue for monitoring disease *** of the m SOD1 G93 A mouse model provides control of the confounding environmental factors and genetic heterogeneity seen in amyotrophic lateral sclerosis patients,while investigating underlying disease-induced *** the present study,we performed a longitudinal behavioral assessment paradigm and identified an early hindlimb symptom,resembling the common gait abnormality foot drop,along with an accompanying forelimb compensatory mechanism in the m SOD1 G93 A *** these initial changes,m SOD1 mice displayed a temporary hindlimb compensatory mechanism resembling an exaggerated steppage *** the disease progressed,these compensatory mechanisms were not sufficient to sustain fundamental locomotor parameters and more severe deficits *** next applied these initial findings to investigate the inherent variability in B6 SJL m SOD1 G93 A *** identified four behavioral variables that,when combined in a cluster analysis,identified two subpopulations with different disease progression rates：a fast progression group and a slow progression *** behavioral assessment paradigm,with its analytical approaches,provides a method for monitoring disease progression and detecting m SOD1 subgroups with different disease *** affords researchers an opportunity to search for genetic modifiers or other factors that likely enhance or slow disease *** factors are possible therapeutic targets with the potential to slow disease progression and provide insight into the underlying pathology and disease mechanisms.

关键词： nerve regeneration amyotrophic lateral sclerosis motoneuron degenerative disease locomotor disease progression disease variability SOD1 mouse neural regeneration

managing hybridization of a recovering endangered species： The red wolf Canis rufus as a case study

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2015年第1期61卷 191-205页

作者： Eric M. GESE Fred F. KNOWLTON Jennifer R. ADAMS Karen BECK todd K. FULLER Dennis L. MURRAY todd D. STEURY Michael K. STOSKOPF Will T. WADDELL Lisette P. WAITS USDA/APHIS/WS/National Wildlife Research Center Department of Wildland Resources Utah State University Logan UT 84322-5230 USA Department ofFish and Wildlife Sciences University of Idaho Moscow Idaho 83844-1136 USA Environmental Medicine Consortium College of Veterinary Medicine North Carolina State University Raleigh NC 27606 USA Department of Environmental Conservation 160 Holdsworth Way University of Massachusetts Amherst MA 01003-9285 USA Department of Biology Trent University 1600 West Bank Drive Peterborough Ontario K9J 7B8 Canada School of Forestry and Wildlife Sciences Auburn University Auburn AL 36849 USA Point Defiance Zoo and Aquarium 5400 North Pearl Street Tacoma WA 98407 USA

Hybridization presents a unique challenge for conservation biologists and managers. While hybridization is an important evolutionary process, hybridization is also a threat formany native species. The endangered species recovery effort for the red wolf Canis rufus is a classic system for understanding and addressing the challenges of hybridization. From 1987-1993, 63 red wolves were released from captivity in eastern North Carolina, USA, to establish a free-ranging, non-essential experimental population. By 1999, managers recognized hybridization with invasive coyotes Canis latrans was the single greatest threat to successful recovery, and an adaptive management plan was adopted with innovative approaches for managing the threat of hybri- dization. Here we review the application and results of the adaptive management efforts from 1993 to 2013 by comparing：（1） the numbers of wolves, coyotes, and hybrids captured, （2） the numbers of territorial social groups with presumed breeding capabili- ties, （3） the number of red wolf and hybrid litters documented each year and （4） the degree of coyote introgression into the wild red wolf gene pool. We documented substantial increases in the number of known red wolves and red wolf social groups from 1987-2004 followed by a plateau and slight decline by *** number of red wolf litters exceeded hybrid litters each year and the proportion of hybrid litters per year averaged 21%. The genetic composition of the wild red wolf population is estimated to include 〈 4% coyote ancestry from recent introgression since reintroduction. We conclude that the adaptive management plan was effective at reducing the introgression of coyote genes into the red wolf population, but population recovery of red wolves will require continuation of the current management plan, or alternative approaches, for the foreseeable future. More broadly, we discuss the lessons learned from red wolf adaptive management that could assist other endangered species r

关键词： Canid Conservation Genetics Hybrid management

Bioelectronic protein nanowire sensors for ammonia detection

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第5期13卷 1479-1484页

作者： Alexander F.Smith Xiaomeng Liu Trevor L.Woodard Tianda Fu todd Emrick Juan M.Jiménez Derek R.Lovley Jun Yao Department of Biomedical Engineering University of MassachusettsAmherstMA 01003USA Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Microbiology University of MassachusettsAmherstMA 01003USA Department of Polymer Science and Engineering University of MassachusettsAmherstMA 01003USA Department of Mechanical and Industrial Engineering University of MassachusettsAmherstMA 01003USA Institute for Applied Life Sciences(IALS) University of MassachusettsAmherstMA 01003USA

Electronic sensors based on biomaterials can lead to novel green technologies that are low cost,renewable,and *** we demonstrate bioelectronic ammonia sensors made from protein nanowires harvested from the microorganism Geobacter *** nanowire sensor responds to a broad range of ammonia concentrations(10 to 10^6 ppb),which covers the range relevant for industrial,environmental,and biomedical *** sensor also demonstrates high selectivity to ammonia compared to moisture and other common gases found in human *** results provide a proof-of-concept demonstration for developing protein nanowire based gas sensors for applications in industry,agriculture,environmental monitoring,and healthcare.

关键词： nanowire protein nanowire biomaterial bioelectronics biosensor ammonia sensor

Recent 28GHz Results with VENUS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2007年第S1期31卷 1-7页

作者： D.Leitner D.S.todd M.L.Galloway C.M.Lyneis Lawrence Berkeley National Laboratory BerkeleyCA 94720-8101USA

The next generation,superconducting ECR ion source VENUS(Versatile ECR ion source for NUclear Science) has operated with 28GHz since 2004,and has produced world record ion beam intensities. The VENUS project is focused on two main ***,for the 88-Inch Cyclotron,VENUS will serve as the third injector source boosting both the energy and intensity of beams available from the ***, VENUS also serves as the prototype injector source for a high intensity heavy ion beam driver linac for a next generation radioactive ion beam facility,where the goal is to produce intense beams of medium to low charge states ions such as 240eμA of Xe^(20+) or 250eμA of U^(28+to34+).These high intensity ion beam requirements present a challenge for the beam transport system since the total currents extracted from the ECR ion source reach several *** in parallel to ion beam developments,we are also enhancing our ion beam diagnostics devices and are conducting an extensive ion beam simulation effort to improve the understanding of the ion beam transport from the VENUS ECR ion *** paper will give an overview of recent experiments with the VENUS ECR ion *** the last ECR ion source workshop in Berkeley in 2004,we have installed a new plasma chamber,which includes X-ray *** enables us to operate the source reliably at high power 28GHz *** this new chamber several high intensity beams(such as 2.4ma of O^(6+),600eμA of O^(7+),1ma of Ar^(9+),etc.)have been *** addition,we have started the development of high intensity uranium *** example,200eμA of U^(33+) and V^(34+) have been produced so *** respect to high charge state ions,leμA of Ar^(18+),133eμA of Ar^(16+),and 4.9eμA of U^(47+) have been *** addition,ion beam profile measurements are presented with,and without the sextupole magnetic field *** experimental results are being compared with simulations using the WARP code.

关键词： VENUS ECR ion source superconducting ECR uranium beams

Accuracy and complications associated with freehand C1 lateral mass screw fixation technique:a radiographic and clinical assessment

在线全文

学校读者我要写书评

暂无评论

Accuracy and complications associated with freehand C1 later...

恐惧的代价:疼痛恐惧、心理忧虑和躯体化对疼痛感知预测作用的比较

2014年浙江省骨科学学术年会

作者： Yong Hu Christopher K.Kepler todd J.Albert Wei-hu ma Rong-ming Xu Department of Spinal Surgery Ningbo No.6 Hospital Department of Orthopaedic Surgery Thomas Jefferson University & Rothman Institute

Study Design.A retrospective radiographic and clinical study of the technique for freehand C1 lateral mass screw(C1LMS)*** aims of this study were to evaluate a large series of posterior C1LMS to determine accuracy based on computed tomography(CT)scan and assess perioperative complication rate related to errant screw *** of Background Data.C1 lateral mass fixation technique is frequently performed for upper cervical

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

心理科学 2014年第1期37卷 53-59页

作者：张西磊 todd Jackson 陈红杨周西南大学心理学部认知与人格教育部重点实验室重庆400715

首次在无痛群体中比较疼痛恐惧、心理忧虑和躯体化对疼痛感知的预测作用大小及调节和中介关系。以多个同类量表得分的Z分数加和作为三者的因子分,以冷压痛觉测验(CPT)疼痛指标(阈限、耐受性、强度、不愉快度)为目标变量,通过分层回归及... 详细信息

首次在无痛群体中比较疼痛恐惧、心理忧虑和躯体化对疼痛感知的预测作用大小及调节和中介关系。以多个同类量表得分的Z分数加和作为三者的因子分,以冷压痛觉测验(CPT)疼痛指标(阈限、耐受性、强度、不愉快度)为目标变量,通过分层回归及调节和中介作用分析,发现疼痛恐惧对疼痛不愉快度的预测作用最强,心理忧虑对疼痛体验(强度、不愉快度)的预测作用被疼痛恐惧完全中介,躯体化只有在高疼痛恐惧条件下才显著负向预测疼痛不愉快度。综上,疼痛恐惧是三因素中预测CPT疼痛体验的主要因素。

关键词：疼痛疼痛恐惧心理忧虑躯体化冷压痛觉测验中介效应调节效应

含高钙和维生素D的强化奶能有效提高健康的绝经后的中国女性体内的维生素D水平并减少骨吸收

在线全文

学校读者我要写书评

暂无评论

中国骨质疏松杂志 2013年第2期19卷 107-113页

作者： marlena C Kruger PengCheng Ha Joanne M todd Barbara Kuhn-Sherlock Linda M Schollum Jiliang ma George Qin Edith Lau 新西兰北帕默斯顿梅西大学中国北京基础研究和临床中心新西兰奥克兰恒天然品牌有限公司新西兰北帕默斯顿恒天然研究中心北京友谊医院香港卫生和医疗研究中心基础研究和临床中心

目的钙摄入水平低以及体内维生素D不足是导致亚洲女性罹患骨质疏松的危险因素。此项研究的目的是评估高钙维生素D强化牛奶(HCM)对健康的中国绝经后妇女的体内维生素D状态和骨吸收标志物进行干预的影响。方法本试验对象为55岁以上,绝经至... 详细信息

目的钙摄入水平低以及体内维生素D不足是导致亚洲女性罹患骨质疏松的危险因素。此项研究的目的是评估高钙维生素D强化牛奶(HCM)对健康的中国绝经后妇女的体内维生素D状态和骨吸收标志物进行干预的影响。方法本试验对象为55岁以上,绝经至少5年的女性。共有124名女性进行了总体健康状况和骨密度检查筛选。63名女性被随机分为对照组和试验组,试验组在12w内每日饮用两次高钙/维生素D强化奶(含900 mg钙、96 mg镁、2.4 mg锌和6.4μg维生素D)。2组分别在试验开始、试验2 w、8 w和12 w时测量血矿物质、25(OH)维生素D3和Ⅰ型胶原C端肽(CTX)水平。结果对照组女性平均年龄为63±4.6岁,高钙强化奶(HCM)组女性平均年龄为62±3.8岁。所测得的每日钙摄入量的基线值为HCM组260～482 mg,对照组为252～692 mg。12 w后HCM组的平均身体质量指数(BMI)显著降低(P<0.05)。HCM组的血25(OH)维生素D3水平显著提高(33.13～39.49 nmol/L),而对照组则维持不变(29.27～28.21 nmol/L)。HCM组的血CTX水平在0 w和2 w之间下降了25%,并保持不变直至第12w。从第2w开始HCM组和对照组相比血CTX水平就出现了显著差异(P<0.001)。结论通过饮用含高钙和维生素D的强化奶(HCM),在2至4w内能显著提高中国绝经妇女体内维生素D水平,并减少骨吸收破坏。如果长期持续地饮用含高钙和维生素D的强化奶(HCM),能减少骨吸收和骨量丢失的风险,从而减少患骨质疏松和由此引起骨折的风险。

关键词：中国绝经后的女性含钙强化奶骨标志物CTX 维生素D水平 25(OH)维生素D3 中国

Accuracy and complications associated with freehand C1 lateral mass screw fixation technique:a radiographic and clinical assessment

在线全文

学校读者我要写书评

暂无评论

Accuracy and complications associated with freehand C1 later...