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Evaluation of Sources and Options for Possible Clean up of Anthropogenic Mercury Contamination in the Ankobra River Basin in South Western Ghana

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Journal of Environmental Protection 2011年第10期2卷 1295-1302页

作者： Thomas mba Akabzaa Sandow Mark Yidana 不详

The study assesses the spatial distribution and sources of mercury contamination in the Ankobra River Basin in southwestern Ghana and discusses possible remediation options and challenges. Eighty-two (82) samples of water and streambed sediments from areas of active and historic artisanal mining and historic mine spoil from large-scale mining were analysed for their total mercury content using cold vapour Atomic Fluorescence Spectrometry (CV-AAS). The highest Hg concentrations were recorded from historic mine tailings, legacy of large scale mines in the area, which averaged 795 ppb but ranged from 80 ppb to 2500 ppb. Concentrations in streambed sediments averaged 139 ppb, but ranged from 63 ppb to 270 ppb. Water, expectedly, gave the lowest Hg concentrations with a mean value of 1.5 ppb, but ranged from below detection to 8 ppb. Areas worked by artisanal miners and historic tailings dumps at Bondaye and Prestea recorded the highest mercury values. These high mercury concentration sites constitute potential sources of major mercury pollution in the area and therefore require major and urgent clean up to mitigate any major health risks. However, any remediation strategy would require further and detailed study of the contaminated sites and an evaluation of known remediation techniques to achieve maximum results.

关键词： Ankobra Basin Mercury Contamination Clean-up Old Tailings Sediments Water

A new tumor-associated antigen prognostic scoring system for spontaneous ruptured hepatocellular carcinoma after partial hepatectomy

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Cancer Biology & Medicine 2018年第4期15卷 415-424页

作者： Jingjing Wu Peng Zhu Zhanguo Zhang Bixiang Zhang Chang Shu Lin Chen Renjie Feng Abdoul aziz mba'nbo koumpa Ganxun Li Qianyun Ge Department of Hepatic Surgery Center Tongji Hospital of Tongji Medical College of Huazhong University of Science and TechnologyWuhan 430030China Department of Neurology Tongji Hospital of Tongji Medical College of Huazhong University of Science and TechnologyWuhan 430030China

Objective:Spontaneous hepatocellular carcinoma(HCC)rupture can be fatal,and hepatic resection could achieve a favorable long-term survival among all strategies of tumor ***,there is no available prognostic scoring system for patients with ruptured HCC who underwent partial ***:From January 2005 to May 2015,129 patients with spontaneous HCC rupture underwent partial *** clinical data were collected and *** risk factors affecting overall survival(OS)were used to develop the new scoring ***’s C statistics,Akaike information criterion(AIC),the relative likelihood,and the log likelihood ratio were calculated to measure the homogeneity and discriminatory ability of a prognostic ***:In the multivariable Cox regression analysis,three factors,including tumor size,preoperativeα-fetoprotein level,and alkaline phosphatase level,were chosen for the new tumor-associated antigen(TAA)prognostic scoring *** 1-year OS rates were 88.1%,43.2%,and 30.2%for TAA scores of 0–5 points(low-risk group),6–9 points(moderate-risk group),and 10–13points(high-risk group),*** TAA scoring system had superior homogeneity and discriminatory ability(Harrell’s C statistics,0.693 vs.0.627 and 0.634;AIC,794.79 vs.817.23 and 820.16;relative likelihood,both<0.001;and log likelihood ratio,45.21 vs.22.77 and 21.84)than the Barcelona Clinic Liver Cancer staging system and the Cancer of the Liver Italian Program in predicting *** results were found while predicting disease-free survival(DFS).Conclusions:The new prognostic scoring system is simple and effective in predicting both OS and DFS of patients with spontaneous ruptured HCC.

关键词： Spontaneous rupture prognostic scoring system homogeneity discriminatory ability overall survival disease-free survival hepatocellular carcinoma

Effect of Ripening Stages on Basic Deep-Fat Frying Qualities of Plantain Chips

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Journal of Agricultural Science and Technology(A) 2013年第5期3卷 341-348页

作者： Ogan mba Jamshid Rahimi Michael Ngadi Department of Bioresource Engineering Macdonald Campus of McGill University Lakeshore Road Ste-Anne-de-Bellevue QuebecH9X3V9 21111 Canada

Plantains （Musa paradisiaca L.） are a major food staple in West Africa and are cooked in various forms. The objective of this work was to evaluate the frying characteristics of plantains at different stages of ripening. The plantains used in the study were at the unripe stage through four different ripening stages. The samples were peeled and sliced into 2 mm thickness and blanched in hot water at 70 ℃ for 3 min. The slices were then deep flied in canola oil at 180 ℃. The result showed that ripening stage significantly affected moisture loss and fat absorption profiles of the plantain chips. Fully ripened plantain absorbed up to 34% （db） oil during 4 min frying, much higher than unripe plantain. The oil uptake and moisture loss during frying of the plantain chip samples were modelled using 1st order kinetics. The kinetic parameters including rates of moisture loss and oil uptake varied according to the different stages of ripening. Ripening had a significant effect on the colour lightness （L） of the chips. Similarly, the redness （a）, the yellowness （b） and textural characteristics were significantly affected by ripening stage.

关键词： Plantain ripening plantain chips deep-frying oil uptake moisture loss kinetics.

大剂量多巴酚丁胺负荷试验结合二维应变成像技术早期诊断冠心病的价值

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中华超声影像学杂志 2011年第2期20卷 116-120页

作者： Cyprien mba mba 邓又斌毕小军王文璇刘蓉朱英华中科技大学同济医学院附属同济医院超声影像科武汉430030

目的探讨大剂量多巴酚丁胺负荷试验结合二维应变成像技术早期诊断冠心病的价值.方法对临床可疑的冠心病患者28例进行大剂量多巴酚丁胺负荷试验,分别在静息状态及各级负荷状态下观察室壁运动情况,测定左室各心肌节段心内膜下心肌的纵... 详细信息

目的探讨大剂量多巴酚丁胺负荷试验结合二维应变成像技术早期诊断冠心病的价值.方法对临床可疑的冠心病患者28例进行大剂量多巴酚丁胺负荷试验,分别在静息状态及各级负荷状态下观察室壁运动情况,测定左室各心肌节段心内膜下心肌的纵向收缩期峰值应变,比较大剂量多巴酚丁胺负荷试验目测法及大剂量多巴酚丁胺负荷试验结合二维应变成像技术诊断缺血心肌的敏感性和特异性;计算正常组、冠心病组缺血节段和非缺血节段的纵向收缩期峰值应变平均值并进行组内及组间比较,利用ROC曲线下面积评价纵向收缩期峰值应变预测缺血心肌的敏感性和特异性.结果冠心病组多巴酚丁胺剂量为40μg·kg^-1·min^-1时目测法检出室壁运动异常6例（共20个节段）,通过计算纵向收缩期峰值应变检出缺血心肌15例（共148节段）;冠心病组大多数缺血节段纵向收缩期峰值应变较正常组及非缺血节段相同负荷状态明显减低（P＜0.05）;大剂量多巴酚丁胺负荷试验目测法和大剂量多巴酚丁胺负荷试验结合二维应变成像技术诊断缺血心肌的敏感性分别为35.3%和88.2%（P＜0.01）,特异性分别为100%和100%（P＞0.05）、准确性分别为60.7%和92.8%（P＜0.01）.多巴酚丁胺剂量为40μg·kg^-1·min^-1时以纵向收缩期峰值应变绝对值≤14.9%为截断值,预测缺血心肌节段的敏感性和特异性分别为83.3%和91.7%.结论大剂量多巴酚丁胺负荷试验结合二维应变成像技术可以提高检出缺血心肌的敏感性,定量评价心肌收缩功能的微小改变,发现隐匿性心肌缺血,为临床诊断早期冠心病患者提供了无创性新方法 .

关键词：超声心动描记术多巴酚丁胺冠状动脉疾病心肌缺血二维应变成像

Agro-Morphological Characterization of Cassava (Manihot esculenta Crantz) Cultivars from Chad

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Agricultural Sciences 2016年第7期7卷 479-492页

作者： Djirabaye Nadjiam Papa Saliou Sarr Michel Naïtormbaïdé Jean Marie mbaïlao mbaïguinam Aliou Guisse Institut Tchadien de Recherche Agronomique pour le Développement (ITRAD) N’Djaména Tchad Département de Biologie Végétale Faculté des Sciences et Techniques (FST) Université Cheikh Anta Diop (UCAD) Dakar Sénégal Laboratory of Plant Gene Expression Research Institute for Sustainable Humanosphere Kyoto University Uji Japan Institut Tchadien de Recherche Agronomique pour le Développement (ITRAD) Centre Régional de Recherche Agronomique pour la Zone Soudanienne Station de Bébédjia Moundou Tchad Université des Sciences et des Technologies Ati Tchad Observatoire Homme Milieux Téssekeré (OHM-Téssekeré) Université Cheikh Anta Diop de Dakar Dakar Sénégal

Cassava is a considerable source of food and income for the rural community of the south of Chad. Despite the importance of the diversity of cultivars in situ, their morphological traits and agronomic performance are under investigated. The aim of this study is to characterize and analyze the variability structure of the cassava’s germplasm. Fifty nine cultivars collected from five main cassava growing regions, were evaluated by forty five agro-morphological descriptors in a Fisher design replicated three times. Data were collected at three, six, nine and twelve months after planting. High phenotypic variability was shown within the collection for the color of apical leaf, vein leaf, petiole, roots and pulp. The same case was observed for the root peduncle, the shape of the central leaflet and the root, the cortex root thickness and the texture of root epidermis. Significant to highly significant differences were observed for all the quantitative traits. High variability were shown for the size of the leaf lobe, petiole length, plant height, root number and length, harvest index, above-ground biomass and fresh root weight. Positive correlations were found between the leaflet and leaf lobe number. Fresh root weight was also positively correlated to the root number, length and diameter. Principal component analysis (PCA) on quantitative variable revealed four groups with two of them containing performant cultivars: Group II with small root, high potential yield but less leaflet and leaf lobe and group III characterized by some cultivars with high productivity, more leaflet and leaf lobe, more and bigger roots. At regional level, significant differences were shown within cultivars which were discriminated in relation to their origin region by the number of the leaf lobes. The better cultivars and the interesting traits could be used to improve cassava production in Chad.

关键词： Variability Traits Cassava Cultivars Local Improved Chad

Heart Failure in Children in a Context of Sars-Cov 2 Infection: About Two Cases at the University Hospital Center of Libreville, Gabon

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Open Journal of Pediatrics 2022年第1期12卷 274-282页

作者： Ayo Bivigou Elsa Mpori Jamila mba Aki Tatiana Ondo mba Léo Békalé Joachim Kouna Philomene Cardiology Department University Hospital of Libreville Libreville Gabon Department of Internal Medicine and Medical Specialties Medical School University of Health Sciences Libreville Gabon Cardiology Unit Jeanne Ebori Mother and Child Foundation University Hospital Center Libreville Gabon Department of Ophthalmology University Hospital of Owendo Libreville Gabon Intensive Care Unit Jeanne Ebori Mother and Child Foundation University Hospital Center Libreville Gabon

This study reports two observations of heart failure diagnosed in the context of SARS-CoV 2 infection in children at the University Hospital Center of Libreville, Gabon. Long considered exempted from serious forms of Covid-19 infection, the fatal evolution of one of the two cases proves that there is an interest for a more rigorous approach in their management in a pandemic context. The multisystem inflammatory syndrome associated with this virus in children can be responsible for cardiac manifestations that can be life-threatening. Early diagnosis and treatment are necessary to reduce mortality. However, this approach is made difficult in our regions by the limited biomedical equipment and the absence of essential therapies as noted in these two observations.

关键词： Heart Failure Children Sars-Cov 2 Infection

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mba考前大演练管理

MBA考前大演练管理

In vitro anti-inflammatory,anti-oxidant and in vivo anti-arthritic properties of stem bark extracts from Nauclea pobeguinii(Rubiaceae) in rats

2000年

作者：陈海泉上海交通大学mba考前辅导教材编委会编

全册共分三部分，第一部分分别介绍了管理、计划与决策、组织、领导、控制等基本概念；第二部分汇集了六套模拟试题；第三部分介绍了经营管理的基本概念，以便考生集中学习和记忆。

关键词：经济经济计划与管理国民经济管理

来源：汇雅图书（南通市图书馆... 评论

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Asian Pacific Journal of Tropical Biomedicine 2020年第2期10卷 65-77页

作者： Tsafack Eric Gonzal Djuichou Nguemnang Stephanie Flore Atsamo Albert Donatien Nana Yousseu William Tadjoua Tchoumbou Herve Matah Marthe mba Vanessa Mbiantcha Marius Ateufack Gilbert Laboratory of Animal Physiology and Phytopharmacology Department of Animal BiologyFaculty of ScienceUniversity of DschangP.O.Box 67DschangCameroon Laboratory of Animal Physiology Faculty of ScienceUniversity of Yaounde IPO Box 812YaoundéCameroon

Objective:To explore the immunomodulatory,anti-inflammatory,anti-oxidant and anti-arthritic activity of aqueous and methanolic extracts of Nauclea pobeguinii stem ***:For in vitro assays,the production of reactive oxygen species(chemiluminescence technique),the proliferation of T cells(liquid scintillation counter method),as well as the inhibition of cyclooxygenase,lipoxygenase,protein denaturation,and free radicals[DPPH,ABTS and nitric oxide(NO)inhibition methods]were *** in vivo assays,a polyarthritis model was induced by complete Freund’s adjuvant in *** aqueous and methanolic extracts of Nauclea pobeguinii stem bark were administered orally at 150 and 300 mg/*** 28 days of treatment,the total blood was taken to quantify the hematological parameters and the serum was used to evaluate the biochemical parameters(alanine aminotransferase,aspartate transaminase,phenylalnine ammonialyase,and proteins)and oxidative stress parameters(malondialdehyde,catalase,superoxide dismutase,glutathione and NO),and then the knee joint was removed for histological ***:The extracts of Nauclea pobeguinii significantly reduced the production of intra-and extracellular reactive oxygen species and decreased T cell *** had an inhibitory effect on cyclooxygenase,lipoxygenase,and protein denaturation,and both extracts had antioxidant capacity on DPPH,ABTS and *** extracts alleviated joint inflammation and pain sensitivity after complete Freund’s adjuvant injection,reduced alanine aminotransferase,aspartate transaminase,alkaline phosphatase,NO and malondialdehyde levels,increased protein concentration,superoxide dismutase,catalase and glutathione activity,and restored the cytoarchitecture of the joint after complete Freund’s adjuvant ***:The aqueous and methanolic extracts of Nauclea pobeguinii have immunomodulatory,anti-inflammatory,anti-oxidant and anti-arthritic properties.

关键词： Nauclea pobeguinii Immunomodulation Antioxidant Anti-inflammatory Anti-arthritic