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Toxicity Level of Lead and Cadmium in High Traffic Density Roadside Soils in Selected Towns of East Shoa Zone, Ethiopia 埃塞俄比亚东Shoa区选定城镇高交通密度路边土壤中铅和镉的毒性水平
Pub Date : 2019-12-31 DOI: 10.24940/theijst/2019/v7/i12/st1911-012
Shimelis Kebede Kekeba
Environmental pollution of heavy metals from automobiles has attained much attention in the recent past. The present research was conducted to study heavy metal contamination in roadside soils of East Shoa Zone of Ethiopia. Roadside soil samples were collected from 4 sites (36 soil samples) and analyzed for the concentrations of two heavy metals (cadmium and lead).Soil samples were collected at distance of 0m, 25m and 50m from the roadside. Lead concentration in soil samples was low and ranged from 0.31 to 0.91 mg kg-1. Lead analyses showed that there was no considerable contamination of soil in the study area. Cadmium concentration was the lowest in the soil and varied from 0.11 to 0.43 mg kg-1. These concentrations were below the critical maximum levels above which toxicity is possible. In general, the levels of heavy metals in the roadside soils investigated were low. Both heavy metals exhibited a decrease in the roadside soils with the increasing distance from the road.
近年来,汽车造成的重金属环境污染引起了人们的广泛关注。本文对埃塞俄比亚东肖亚地区路边土壤重金属污染进行了研究。从4个站点(36个土壤样本)收集路边土壤样本,分析两种重金属(镉和铅)的浓度。在距离路边0m、25m和50m处采集土壤样本。土壤样品中的铅浓度较低,在0.31 ~ 0.91 mg kg-1之间。铅分析表明,研究区土壤没有受到严重污染。土壤中镉含量最低,为0.11 ~ 0.43 mg kg-1。这些浓度低于可能产生毒性的临界最高水平。总体而言,路边土壤重金属含量较低。随着离公路距离的增加,两种重金属在路边土壤中的含量均呈下降趋势。
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引用次数: 0
Job Stress and Coping Strategies of Female Teachers in Public Secondary Schools in Aniocha North L.G.A of Delta State, Nigeria 尼日利亚三角洲州Aniocha North L.G.A公立中学女教师的工作压力及应对策略
Pub Date : 2019-12-31 DOI: 10.24940/theijst/2019/v7/i12/st1912-020
I. M. Anaenyeonu, Ikuelogbon Olamire James, Obiano Dinah Ifeinaya
This study is descriptive survey research carried out to ascertain job related stress among female teachers in public secondary schools in Aniocha North L.G.A. of Delta state. A sample of 100 female teachers was used for the study. The instrument used for data collection was a 24-item questionnaire. The research questions were answered using mean scores and standard deviations. The findings revealed that the level of stress among female teachers is significantly high which make them often engaged in some coping behaviours. Also, it was revealed that there are some factors causing stress among female teachers. Likewise, the study revealed some strategies that could be adopted to reduce job related stress among female teachers. Based on the findings, the researchers recommended that female teachers should dedicate more time to sport activities, there should be expertise such as counselors in the schools so as to assists anyone going through stressful situations in the schools. Government should make provision sporting and recreational centers in the school and that school authorities should ensure that the work assigned everyone is minimal enough so as to reduce stress among the female teachers.
本研究为描述性调查研究,以确定三角洲州阿尼奥查北L.G.A.公立中学女教师的工作相关压力。该研究使用了100名女教师作为样本。数据收集工具为24项问卷。研究问题采用平均分和标准差来回答。调查结果显示,女教师的压力水平明显较高,导致她们经常采取一些应对行为。此外,调查还揭示了造成女教师压力的一些因素。同样,研究也揭示了一些可以采取的策略来减少女教师的工作压力。基于研究结果,研究人员建议女教师应该投入更多的时间在体育活动上,学校应该有专业人士,如辅导员,以帮助任何在学校遇到压力的人。政府应在学校提供体育和娱乐中心,学校当局应确保分配给每个人的工作尽量少,以减轻女教师的压力。
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引用次数: 0
Design and Implementation of Secured Personal Data Servers of Patient Medical Records in Nigeria: A Case Study of Island Maternity Lagos 尼日利亚病人医疗记录安全个人数据服务器的设计和实现:以拉各斯产妇岛为例
Pub Date : 2019-11-30 DOI: 10.24940/theijst/2019/v7/i11/st1911-017
S. J. Abayomi
This research is based on the design and implementation of Secured Personal Data Server of Patient Medical Records in Nigeria. It is built upon the emergence of portable data server (PDS) with well secured devices that combines the security of smart cards with embedded software devices and storage capacity of NAND Flash Chips which is a novel model that is in compliance with healthcare standards in relation to data and service user-friendliness. In order to access a resource, users must meet the regulatory conditions of the policy class which is in conformity with organizational standards as stipulated by the Federal Ministry of Health in Nigeria that regularize healthcare policies. The system was designed to be flexible and adaptive in order to allow users pass on their rights of access to other users, permission given for right of access can be withdrawn based on the stipulated restrictions that have been defined in the program. The problem of inadequate healthcare facilities in producing sustainable development in Nigeria, breaches of security, delivery, confidentiality, ethical risk issues and privacy risks incurred by centralization due to privacy violations that arise from negligence, abusive use, internal and external attacks. The PDS with current server-based approach, cryptography-based and server-side secured hardware is capable of dismissing the semajor problems. The researchs pecific objectives are to provide the main functionalities of a database engine that will be interoperable with existing data sources and allow secured data sharing protocols by establishing control of how users personal data are shared with others and creating a way of harmonising patient’s data from other hospitals in the country as well as beyond and also allow interoperability of clinical systems. This study adopts authentication and authorization method at inter / intra organizational levels for the security and delivery of patients’ clinical data. A stratified database with indexing and hashing techniques that can change strata without incurring a dramatic number of alterations where precomputed, relational context and Queries are executed in a pure pipeline fashion. The system will cut down substantially the cost of travelling abroad for medical consultations, which runs into billions of U.S. dollars or Naira (the Nigerian currency), especially given the poverty and related economic difficulties that Nigeria and other developing world countries face. The PDS devices are expected to assist doctors and clinicians in reviewing patients’ medical history and status prior to a consult or in reaching a diagnosis. It is also expected to provide support regarding timely referrals to and location of healthcare facilities for parallel care as needed.
本研究是基于尼日利亚患者医疗记录安全个人数据服务器的设计与实现。它是基于便携式数据服务器(PDS)的出现而建立的,该服务器具有良好的安全设备,将智能卡的安全性与嵌入式软件设备和NAND闪存芯片的存储容量相结合,这是一种符合医疗保健标准的新型模型,涉及数据和服务用户友好性。为了获取资源,用户必须满足政策类的监管条件,这些条件必须符合尼日利亚联邦卫生部规定的使医疗保健政策规范化的组织标准。该系统的设计是灵活的和自适应的,以便允许用户将他们的访问权传递给其他用户,授予访问权的许可可以根据程序中定义的规定限制撤回。尼日利亚在促进可持续发展方面保健设施不足的问题,违反安全、交付、保密、道德风险问题以及由于疏忽、滥用、内部和外部攻击而造成的隐私侵犯而导致的集中化所带来的隐私风险。采用当前基于服务器的方法、基于密码学和服务器端安全硬件的PDS能够消除主要问题。该研究的具体目标是提供与现有数据源互操作的数据库引擎的主要功能,并通过建立用户个人数据如何与他人共享的控制,创建一种协调来自国内其他医院以及国外的患者数据的方法,从而允许安全的数据共享协议,并允许临床系统的互操作性。本研究采用组织间/组织内认证和授权的方式来保障患者临床数据的安全与传输。具有索引和散列技术的分层数据库,可以在不引起大量更改的情况下改变分层,其中预先计算的关系上下文和查询以纯管道方式执行。这一制度将大大减少出国就医的费用,这种费用高达数十亿美元或奈拉(尼日利亚货币),特别是考虑到尼日利亚和其他发展中国家面临的贫困和相关的经济困难。PDS设备有望帮助医生和临床医生在会诊或诊断前审查患者的病史和状态。预计它还将根据需要提供及时转诊到保健设施并确定其地点的支助。
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引用次数: 0
Social Networking Sites an Enabler for Implementation for Telemedicine in Developing Countries 社交网站是发展中国家实施远程医疗的推动者
Pub Date : 2019-11-30 DOI: 10.24940/theijst/2019/v7/i11/st1911-025
Joseph Menge Orori
Social Networking Sites (SNS) are pages or sites through which individuals or a group of individual shares and communicate over issues relating to a variety of topics. It plays an important role that is significant in the fields of agriculture, business, banking and tourism, especially in transfer information, search, advertising and interaction among the customers. Telemedicine is provision and support of health care with the use of Information Communication Technology. It does not limit its services to communication between doctors and nurses but also in diagnosis, consultations monitoring and surgical services. It enables citizens irrespective of their location from medical services to access and seek medical attention without moving from a remote area to an urban area with these services. A good number of developed countries like the United States of America and the United Kingdom have implemented telemedicine and the results can be felt. In some developing countries, implementation has been undertaken but with challenges involved. For instance, countries like Kenya and Bangladesh are working tirelessly to implement telemedicine to improve the provision of affordable healthcare services to its people. Social Networking Sites are the most effective means of online communication that has been integrated in political, social and economic life of users. This study is a result of literature review evaluation to establish role of social networking sites in implementation of Telemedicine in developing countries.
社交网站(SNS)是个人或一群人分享和交流与各种主题有关的问题的页面或网站。它在农业、商业、银行和旅游等领域发挥着重要的作用,特别是在传递信息、搜索、广告和客户之间的互动方面。远程医疗是利用信息通信技术提供和支持卫生保健。它的服务不仅限于医生和护士之间的沟通,还包括诊断、咨询、监测和手术服务。它使公民不论其医疗服务地点如何,都能获得和寻求医疗服务,而无需从偏远地区搬到有这些服务的城市地区。许多发达国家,如美利坚合众国和联合王国,已经实施了远程医疗,并取得了成效。在一些发展中国家,已经开始执行,但也面临挑战。例如,肯尼亚和孟加拉国等国正在不懈努力实施远程医疗,以改善向其人民提供负担得起的医疗保健服务。社交网站是最有效的在线交流手段,已经融入到用户的政治、社会和经济生活中。本研究是文献回顾评估的结果,以确定社交网站在发展中国家实施远程医疗的作用。
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引用次数: 0
Factors Influencing Adherence to Data Protection Guidelines among Researchers at the Kenya Medical Research Institute 影响肯尼亚医学研究所研究人员遵守数据保护准则的因素
Pub Date : 2019-11-30 DOI: 10.24940/theijst/2019/v7/i11/st1911-001
Kebenei Enock Kipchirchir, G. Otieno, Rucha Kibaara Kenneth
Background A study conducted in Kenya between January and June 2014 showed that one of the important challenges facing researchers in public health data sharing is the risk to the interests of study participants. Exposure of participant’s data can lead to stigmatization, loss of privacy, and unfair competition. Data loss can be through the form of intentional and unintentional 'misuse' of data. This study sought to determine the factors influencing adherence to the data protection guidelines among the researchers at KEMRI, Kenya: the national body responsible for carrying out health research in Kenya. Objective The study sought to determine the individual and organizational factors influencing adherence to the data protection guidelines among health researchers in KEMRI, Kenya. Methods This study was conducted among health researchers at the Kenya Medical Research Institute in Nairobi, Kilifi, Kisumu, and Busia Counties, Kenya. This was a quantitative cross-sectional study design involving 141 health researchers. Stratified sampling method was used to obtain the representative sample of the whole population. Questionnaires were administered to the selected KEMRI researchers. A total of nine questions extracted from the NACOSTI guidelines were asked. A respondent was considered to have adhered if he/she has agreed to all the nine questions. A p-value of <0.05 was considered statistically significant. Results The significant individual factors that influences adherence to the national data protection guidelines among KEMRI researchers are common forms in which data may leak to unintended persons/places (p-value of 0.04) and research stages (p-value of 0.03). The availability of guidelines or policies on data protection within the institute is the organizational factor which highly influences adherence to data protection with a p-value of 0.01 (this shows that it is highly significant). Institutional Ethics Review Boards (IRB) and Data Safety & Monitoring Boards (DSMBs) clearly do not play a critical role in data protection in health research with a p-value of 0.77(this shows that it is highly insignificant). Conclusion These results imply that both the individual and organizational factors influence adherence to the data protection guidelines among health researchers.
2014年1月至6月在肯尼亚进行的一项研究表明,研究人员在公共卫生数据共享方面面临的重要挑战之一是对研究参与者利益的风险。暴露参与者的数据可能导致污名化、隐私丧失和不公平竞争。数据丢失可以通过有意或无意的“误用”数据的形式出现。这项研究试图确定影响肯尼亚KEMRI研究人员遵守数据保护准则的因素:肯尼亚KEMRI是负责开展肯尼亚卫生研究的国家机构。目的:本研究旨在确定影响肯尼亚KEMRI卫生研究人员遵守数据保护指南的个人和组织因素。方法本研究在肯尼亚内罗毕、基利菲、基苏木和布西亚县的肯尼亚医学研究所的卫生研究人员中进行。这是一项涉及141名健康研究人员的定量横断面研究设计。采用分层抽样的方法,获得了总体的代表性样本。对选定的KEMRI研究人员进行了问卷调查。共提出了9个从NACOSTI指南中摘录的问题。若受访者同意全部九个问题,即视为已同意。p值<0.05认为有统计学意义。结果影响KEMRI研究人员遵守国家数据保护指南的显著个体因素是数据可能泄露给意外人员/地方的常见形式(p值为0.04)和研究阶段(p值为0.03)。研究所内部数据保护指导方针或政策的可用性是高度影响遵守数据保护的组织因素,p值为0.01(这表明它非常重要)。机构伦理审查委员会(IRB)和数据安全与监测委员会(DSMBs)在卫生研究数据保护方面显然没有发挥关键作用,p值为0.77(这表明它非常不显著)。结论个人因素和组织因素都影响健康研究人员对数据保护指南的遵守。
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引用次数: 0
Comparative Study on the Microbiological and Nutritional Qualities of Fermented Parkia Biglobosa Produced Locally and in the Laboratory 地方生产和实验室生产的发酵枇杷膏微生物学和营养品质的比较研究
Pub Date : 2019-10-31 DOI: 10.24940/theijst/2019/v7/i10/st1910-025
O. Okhonlaye, B. A. Adepetun
Fermentation makes the food condiment Parkiabiglobosa “Iru” to be more nutritious, digestible and safer with better flavour. Fermented Parkiabiglobosa‘Iru’ is known to have high protein content, thus serving a dual purpose of flavouring as well as source of protein supplement. There is only little information available on comparative evaluation of the nutritional quality of the locally produced “Iru” condiment with the one produced in the laboratory. Hence, this present study focusses on the evaluation of proximate and anti-nutrient composition of fermented Parkia biglobosa produced locally and in the laboratory. Result from the microbial examination revealed the bacterial load for the locally produced Parkiabiglobosa‘Iru’ ranged between 75.00 x103cfu/g and 264.66x103cfu/g while that of laboratory produced sample ranged between 5.33x103cfu/g and 84.33x103cfu/g. Lactic acid bacteria load was higher after de-hulling in the locally produced samples with a value of 84.33x103cfu/g and reduced significantly to 6.33 x103cfu/g after 72hrs of fermentation. Fungal load of the laboratory produced Parkiabiglobosa ‘Iru’ reduced significantly (P<0.05) as fermentation progresses. More so, the proximate analysis revealed that Ash content also increased significantly (P<0.05) as fermentation progresses. The protein content also increased after 72hrs of fermentation in both local and laboratory produced ‘Iru’ samples. Carbohydrate content also reduced significantly from 34.35 to 14.47% and 32.82 to 20.80% for the locally produced and laboratory produced fermented Parkiabiglobosa respectively. Conclusively, this work had shown that contamination of fermented Parkiabiglobosa‘iru” might have originatedParkiabiglobosa might have originated from foot pressing during de-hulling, contaminated water, poor personal hygiene of food handlers and dirty environmental conditions during processing. Therefore, training about environmental sanitation is essential and highly recommended.
发酵使食品调味品“伊鲁”营养更丰富、更易消化、更安全、风味更好。众所周知,发酵的Parkiabiglobosa ' iru '具有高蛋白质含量,因此具有调味和蛋白质补充来源的双重目的。关于对当地生产的“Iru”调味品与实验室生产的调味品的营养质量进行比较评价的资料很少。因此,本研究的重点是评估当地和实验室生产的发酵大叶Parkia的近似和抗营养成分。微生物学检查结果显示,当地生产的“iru”样品的细菌负荷范围为75.00 × 103cfu/g ~ 264.66 × 103cfu/g,实验室生产的样品的细菌负荷范围为5.33 × 103cfu/g ~ 84.33 × 103cfu/g。当地生产的样品脱壳后乳酸菌负荷较高,为84.33x103cfu/g,发酵72小时后显著降低至6.33 x103cfu/g。随着发酵的进行,实验室生产的‘Iru’真菌负荷显著降低(P<0.05)。随着发酵的进行,粗灰分含量也显著增加(P<0.05)。在本地和实验室生产的“Iru”样品发酵72小时后,蛋白质含量也有所增加。本地生产和实验室生产的发酵白桦糖的碳水化合物含量也分别从34.35%降低到14.47%和32.82%降低到20.80%。最后,这项工作表明,发酵的紫菜污染可能起源于紫菜脱壳过程中的脚压、水的污染、食品处理人员的个人卫生差和加工过程中的肮脏环境条件。因此,关于环境卫生的培训是必要的,强烈建议。
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引用次数: 0
Assessment of Magnitudes of Vulnerabilities to Drought in Pastoral Production System in Marsabit, Northern Kenya 肯尼亚北部马萨比特畜牧生产系统干旱脆弱性程度评估
Pub Date : 2019-10-31 DOI: 10.24940/theijst/2019/v7/i10/st1908-014
Jiddah Choke Chufe, B. Oindo, P. Abuom
: Communities in arid and semi-arid lands are faced with a number of challenges including short and unreliable rainfall and recurrent droughts affecting large numbers of humans and livestock. The drought frequency and severity has increased and is negatively impacting on households. This has increased the vulnerability levels in households. However, the magnitudes of vulnerabilities on households are not well understood and documented. The objectives of this study are to assess magnitude of vulnerabilities to drought in pastoral production system. Simple cross-sectional random sampling was used for primary data collection through questionnaires. 384 households were randomly interviewed in a household population of about 19,000 households using the (Scott Smith, 2013) formula for deciding the sample size. Secondary data was obtained from relevant public reports, journals, agricultural reports, statistical abstracts and development partners. The study considered various biophysical and socio-economic factors to calculate Vulnerability Index. Weights for different indicators to calculate the household vulnerability index (HVI) was used. The household Vulnerability Index was constructed using Principal Component Analysis (PCA). Data analysis was done using frequencies, percentages, spearman correlation, cross tabulations and chi square tests. The results were presented using tables, bar graphs, pie charts and plates. The data was analysed through computer Excel and SPSS programmes. The presentation of results was done in form of narrative, graphs, tables, pie and bar charts. The results show that 2.3 % of the households were highly vulnerable, 32.6 % were moderately vulnerable and 65.1 % less vulnerable. The overall drought vulnerability for the study area was 0.46, indicating moderate vulnerability. This implies moderate support is required from external sources. In order to build community drought resilience camel keeping, development of strategic water resources and investments in rangeland reseeding and control of invasive plant species is necessary. pre-drought mitigation of future placed on response-oriented (Abraham, risk management involves understanding vulnerabilities mitigation modifies in to ‘crisis
:干旱和半干旱地区的社区面临着一系列挑战,包括降雨短暂和不可靠,以及影响大量人类和牲畜的经常性干旱。干旱的频率和严重程度都有所增加,对家庭产生了负面影响。这增加了家庭的脆弱程度。然而,家庭脆弱性的严重程度并没有得到很好的理解和记录。本研究的目的是评估畜牧业生产系统对干旱的脆弱性程度。采用简单横断面随机抽样,通过问卷调查的方式收集原始资料。使用(Scott Smith, 2013)公式决定样本量,在约19,000户家庭人口中随机采访了384户家庭。次要数据来自相关的公开报告、期刊、农业报告、统计摘要和发展伙伴。该研究考虑了各种生物物理和社会经济因素来计算脆弱性指数。采用不同指标的权重计算家庭脆弱性指数(HVI)。采用主成分分析法(PCA)构建家庭脆弱性指数。数据分析采用频率、百分比、spearman相关性、交叉表和卡方检验。结果用表格、条形图、饼状图和盘子呈现。通过计算机Excel和SPSS程序对数据进行分析。结果以叙述、图形、表格、饼状图和条形图的形式呈现。结果表明,2.3%的家庭处于高度脆弱状态,32.6%的家庭处于中等脆弱状态,65.1%的家庭处于较弱脆弱状态。研究区总体干旱易损性为0.46,属于中等易损性。这意味着需要外部资源的适度支持。为了建立社区抗旱养骆驼,有必要开发战略水资源,投资于牧场补种和控制入侵植物物种。未来的干旱前缓解以应对为导向(亚伯拉罕,风险管理涉及了解脆弱性缓解对“危机”的修正
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引用次数: 0
Environmental Radiology of Southern Part of Zamfara State, Nigeria 尼日利亚扎姆法拉州南部的环境放射学
Pub Date : 2019-10-31 DOI: 10.24940/theijst/2019/v7/i10/st1910-009
N. Umar, N. Garba, N. Rabiu, Odoh M. Christopher, M. Saleh
The activity concentrations of the naturally occurring radionuclide for the soil samples collected from Southern Zamfara State were measured using Hyper-pure Germanium detector (HPGe). The terrestrial gamma radiation doses were measured using inspector alert, model 35448 manufactured by U.S.A from 250 locations across southern Zamfara. The mean activity concentrations of226Ra, 232Th and 40K in the soil samples were found to be 55 Bqkg-1, 35 Bqkg-1 and 267 Bqkg-1, respectively. The activity concentration of232Th, and 40K obtained are within the recommended values of 45 Bqkg1 and 420 Bqkg-1, while 226Ra concentration 55Bqkg-1is higher than the world average value of 32 Bqkg-1. The annual effective dose (AED), external ( ) and internal ( ) hazard index and Gamma representative index were computed as 0.07 μSvy-1, 0.33, 0.98 and 0.81, respectively. The values are within the recommended safe limit of unity. Other parameters such as annual gonadal dose equivalent, radium equivalent activity and excess lifetime cancer risk were also computed as 390.61 μSvy-1, 123.73 Bqkg-1 and 0.34. The values obtained for annual gonadal dose equivalent and excess lifetime cancer risk are higher than the recommended values of 300 μSvy-1 and 0.29, while radium equivalent activity is lower than the safe limit 370 Bqkg-1. The result implies that the gonadal values may have some effects on the reproductive organs of the people in the study area. But other radiation hazard parameters show that it is safe to use the soil in the study area for farming and other activities.
采用超纯锗探测器(HPGe)测量了采自南扎姆法拉州土壤样品中天然存在的放射性核素的活度浓度。地面伽马辐射剂量是用美国制造的35448型检查员警报从Zamfara南部的250个地点测量的。土壤样品中226ra、232Th和40K的平均活性浓度分别为55 Bqkg-1、35 Bqkg-1和267 Bqkg-1。得到的232th、40K活性浓度均在45 Bqkg1、420 Bqkg-1的推荐值之内,而226Ra浓度55bqkg -1高于32 Bqkg-1的世界平均值。计算年有效剂量(AED)、外、内危害指数和γ代表指数分别为0.07 μSvy-1、0.33、0.98和0.81。这些值都在推荐的统一安全范围内。其他参数如年性腺剂量当量、镭当量活度和超额终身癌风险分别为390.61 μSvy-1、123.73 Bqkg-1和0.34。所得的年性腺剂量当量和终生癌风险值分别高于300 μ svey -1和0.29的推荐值,而镭当量活性低于安全限值370 Bqkg-1。结果表明,性腺值可能对研究地区人群的生殖器官有一定的影响。但其他辐射危害参数表明,研究区土壤用于农业和其他活动是安全的。
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引用次数: 0
Auditory Brainstem Responses of Schizophrenic Patients in a Nigerian Mental Health Clinic 尼日利亚精神卫生诊所精神分裂症患者的听觉脑干反应
Pub Date : 2019-09-30 DOI: 10.24940/theijst/2019/v7/i9/st1909-027
O. Ogundiran, J. Tobih, O. Odetoyinbo, A. A. Adeosun, A. Olaosun, O AdedejiT., C OgundiranA., S. A. Ogunkeyede, J. Falade, A. J. Adigun, B. Eegunranti
Background: Schizophrenia is a mental disorder characterized by incoherent or illogical thoughts, bizarre behavior and speech, delusions or hallucinations such as hearing voices. The prevalence rate of schizophrenia is about 1.1 percent of the population over the age of 18 years old, while the average age of onset is 18 and 25 years old in male and female respectively. This is considered the most critical age in social and vocational development. Most schizophrenic patients have a low socioeconomic status but this is not because schizophrenia preferentially targets the poor but mainly because it brings about drastic impairment in social and occupational skills.
背景:精神分裂症是一种精神障碍,其特征是思维不连贯或不合逻辑,行为和言语怪异,妄想或幻觉,如幻听。精神分裂症的患病率约占18岁以上人口的1.1%,而男性和女性的平均发病年龄分别为18岁和25岁。这被认为是社会和职业发展中最关键的年龄。大多数精神分裂症患者的社会经济地位较低,但这并不是因为精神分裂症优先针对穷人,而主要是因为它会严重损害社会和职业技能。
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引用次数: 0
Aquaculture as Source of Environmental Contaminants: A Study of Earthen Pond versus Plastic Pond 水产养殖作为环境污染物的来源:土池与塑料池的比较
Pub Date : 2019-09-30 DOI: 10.24940/theijst/2019/v7/i9/st1909-001
Benjamin A. Adegola, G. A. Idowu
: In Sub-Sahara Africa, small-scale aquaculture systems (earthen ponds and plastic basin ponds) have become popular as means of fish cultivation, both for subsistence and as a source of income. Their successful practice, however, involves the use of organic and inorganic chemical substances which may accumulate in pond water and sediments, ultimately finding their ways into the larger environment when the ponds are eventually emptied. This may have significant impact on the environment, since individual communities have thousands of such small-scale systems which are largely unregulated. In this study, we investigated the physico-chemical characteristics and heavy metal composition of typical earthen and plastic ponds. Result of physicochemical analyses revealed the possibility of release of carbonaceous organic materials which may deplete the oxygen levels in natural waters for their decomposition. Such organic materials would come mainly from plastic ponds, as a result of leaching of the plastic monomers and additives into the pond water. The study indicated that both earthen and plastic ponds could contribute to the contamination of the environment by heavy metals, especially Copper (Cu), manganese (Mn) and Zinc (Zn). Possible contributions to Cu, Mn and Znlevels are 3.92 mg, 2.68 mg and 2.63 mgrespectively, per litre of earthen pond water; and 2.57 mg, 1.94 mg and 2.08 mgrespectively, per litre of plastic pond water discharged into the environment. Sediment/sludge of both earthen and plastic ponds have the potential to spike Cu levels in the environment by 5.27 mg and 3.61 mg per kg of sediment discharged, respectively. This study constitutes an initial investigation into the environmental impacts of earthen and plastic pond aquaculture (with respect to chemical contaminants) and could assist authorities in tropical Africa to formulate policies to ensure that the sustainability and quality of the natural environments are not compromised by the proliferation of small-scale effect of heavy metals on plant species, on fauna such as arthropods and earthworms, on the development of microbiological processes, the tendency of the metals to go into solution, and the possibility to enter ground and surface waters. Thus, values above the MPC suggest that the particular metals in the sediment or soil may constitute a hazard to the environment. For metals that the MPC are specified for, the results show that the concentration of metals measured in the earthen and plastic pond sediments are mostly below the MPC, implying that the levels of metals in sediment/sludge resulting from single operation of earthen or plastic pond do not constitute a source of environmental concern. The only exception is Cu, in which the MPC is exceeded in both sediment types, even after taking out the background Cu concentration in the soil for the earthen pond. As for the pond waters in both cases, this study reveals that Cu concentration in the sediments/sludge of both pond ty
在撒哈拉以南非洲,小规模水产养殖系统(土池和塑料池)已成为流行的养鱼手段,既可维持生计,也可作为收入来源。然而,他们成功的做法涉及使用可能积聚在池塘水和沉积物中的有机和无机化学物质,当池塘最终被清空时,这些化学物质最终会进入更大的环境。这可能对环境产生重大影响,因为个别社区有数千个这样的小规模系统,而这些系统基本上不受管制。本研究对典型泥塘和塑料塘的理化特征及重金属组成进行了研究。理化分析的结果揭示了释放含碳有机物质的可能性,这些物质可能会耗尽天然水体中的氧气水平以进行分解。这些有机材料主要来自塑料池塘,因为塑料单体和添加剂浸出到池塘水中。研究表明,土池和塑料池都可能对环境造成重金属污染,尤其是铜(Cu)、锰(Mn)和锌(Zn)。每升泥塘水对铜、锰和锌含量的可能贡献分别为3.92毫克、2.68毫克和2.63毫克;每升排入环境的塑料池塘水分别为2.57毫克、1.94毫克和2.08毫克。土池塘和塑料池塘的沉积物/污泥有可能使环境中的铜含量分别增加5.27毫克和3.61毫克每公斤排放的沉积物。这项研究是对土塘和塑料塘水产养殖(关于化学污染物)的环境影响的初步调查,可以协助热带非洲当局制订政策,以确保自然环境的可持续性和质量不因重金属对植物物种、节肢动物和蚯蚓等动物群、微生物过程发展的小规模影响的扩散而受到损害。金属进入溶液的趋势,以及进入地下水和地表水的可能性。因此,高于MPC的值表明沉积物或土壤中的特定金属可能对环境构成危害。至于指定的重金属浓度,结果显示,在泥塘和塑料塘的沉积物中测量的金属浓度大多低于重金属浓度,这意味着泥塘或塑料塘的单一操作所产生的沉积物/污泥中的金属含量不会构成环境问题的来源。唯一的例外是铜,两种沉积物类型的MPC都超过了,即使在去掉土池土壤中的背景铜浓度后也是如此。对于两种情况下的池塘水,本研究表明,两种池塘类型的沉积物/污泥中的Cu浓度构成了这种金属污染环境的来源。
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引用次数: 0
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The International Journal of Science & Technoledge
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