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Development of a Passive Ankle Foot Prosthesis with Manually Adjustable Ankle Stiffness  [PDF]
Tafadzwa Dongo, Benard W. Ikua, Daniel Nyamongo Sagwe, Elliot J. Rouse
Open Journal of Therapy and Rehabilitation (OJTR) , 2019, DOI: 10.4236/ojtr.2019.74009
Abstract: Major advancements have been made in the field of prosthetics, but devices remain largely out of reach for the amputee population domiciled in the developing nations, which makes up 80% of the entire amputee population of the world. The amputees are left to contend with low function prosthetics that do not mimic the behavior of the natural lost limb, with the long-term use of such devices leading to physical injury to the user. This work was aimed at developing a low-cost ankle-foot prosthesis that affords the user the opportunity to manually alter the stiffness of the ankle, as well storing energy in a forefoot section to aid push-off in late stance. In this paper, the design and results of structural analysis performed on critical parts of the prosthesis are presented, as well as the future direction of the work.
HIV and AIDS Programmes in Zimbabwe: Implications for the Health System
Tafadzwa Chevo,Sandra Bhatasara
ISRN Immunology , 2012, DOI: 10.5402/2012/609128
Corrosion Behavior of Fe-Al-Zn Interphased Dual Phase Steel in Marine Environment  [PDF]
Itopa Monday Momoh, Isaac Enesi Dongo
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2019, DOI: 10.4236/jmmce.2019.72006
Abstract: Intercritical heat treatment operation has been in use for the development of Dual Phase Steel (DPS) and has been found to improve the mechanical properties of the steel. In spite of the enhancement a limitation was however observed as to its corrosion susceptibility. In a bid to further enhance the corrosion resistance of the DPS while maintaining its mechanical properties, galvanealing operation was adopted which involving the immersion of the DPS into Al-Zn melt and subsequently subjecting it to annealing operation at 550°C. Weight loss and linear polarization technique were used to measure or evaluate its resistance in 3.5% NaCl (a simulated marine environment). A minimum of 3 samples was used per immersion time. From the result, it was observed that there is a general sharp decrease in the corrosion rate of the GAS as compared to the control sample. The sample immersed and allowed to dwell in the melt for 20 seconds and further annealed with a soaking time of 20 minutes exhibited the highest corrosion resistance. The polarization curve also shows that the substrate was generally passivated, and this is as a result of the Al-Zn/Fe adhesiveness.
Pitfalls in the Diagnosis of Trypanosomiasis in Low Endemic Countries: A Case Report
Leolin Katsidzira ,Golden Tafadzwa Fana
PLOS Neglected Tropical Diseases , 2010, DOI: 10.1371/journal.pntd.0000823
Hepatitis B Virus Seroprevalence and Serology Patterns in a Cohort of HIV Positive Individuals from Harare, Zimbabwe
Mayibongwe Louis Mzingwane,Tafadzwa Mamvura
Journal of Viruses , 2014, DOI: 10.1155/2014/691953
Abstract: Zimbabwe is highly endemic for hepatitis B virus (HBV) and also has high human immunodeficiency virus (HIV) prevalence rates which may result in HIV/HBV coinfection, and as HIV/HBV coinfection may affect the classical HBV serology patterns and cause interpretation challenges, we assessed the seroprevalence of HBV in HIV positive patients and determined their serology profiles. This was a cross-sectional study on 957 HIV positive specimens from treatment naive patients. HBV serology tests were done using enzyme immunoassays for the detection of HBV markers in human serum or plasma. Hepatitis B surface antigen (HBsAg) prevalence was 17.1% (males 19.0%, females 15.8%). Previous and/or current HBV exposure was evident in 59.8% of the patients and hepatitis B e antigen markers were present in 103 (10.8%) specimens. There was high prevalence of unusual HBV patterns with 14.1% of total specimens showing an anti-HBc alone profile and an additional 4.3% HBsAg positive specimens that were anti-HBc negative. 1. Introduction Hepatitis B virus (HBV) can cause both acute and chronic disease and is the leading cause of viral hepatitis worldwide [1]. An estimated two billion people have been infected with HBV and more than 350 million have chronic HBV liver infections resulting in about 600?000 deaths every year [2]. It was previously reported that Zimbabwe has an overall HBV surface antigen (HBsAg) seroprevalence rate of 15.4% in the general population [3] and is classified as a high HBV endemic area. Zimbabwe also has high HIV prevalence rates of around 15% in the general population [4], but there is little or no data on HBV and HIV coinfection. The prevalence of HIV infected Zimbabweans carrying HBV serological markers is not known. Although some studies in sub-Saharan Africa have shown no major increase of HBV prevalence in HIV patients [5] other studies have reported higher HBV prevalence in HIV patients [6, 7]. This piece of information will be important as the clinical impact of HBV infection in HIV positive patients has progressively grown since the introduction of highly active antiretroviral therapy (HAART) given the increase in survival rates experienced by these patients who now experience the effect of other chronic infections such as HBV. Chronic HBV infection is defined as persistent detection of HBV surface antigen (HBsAg) for more than 6 months [8, 9]. HIV/HBV coinfections may have negative implications on chronic HBV patients including increased rates of chronic HBsAg positivity, high HBV DNA levels, and lower rates of anti-hepatitis B virus e antigen
Status of cocoa swollen shoot virus disease in Nigeria
LN Dongo, SB Orisajo
African Journal of Biotechnology , 2007,
Abstract: Cocoa Swollen Shoot Virus Disease (CSSVD) is one of the major diseases affecting cocoa production in West Africa, especially Ghana. The lack of any published article on the continued presence or absence of this viral disease has necessitated this investigation. Cocoa leaf samples from plants showing symptoms of leaf chlorosis, interveinal chlorosis with mottling and swollen shoot were collected from Cocoa Research Institute of Nigeria, Ibadan, and two farmers’ plots at Offa-Igbo, both in Oyo State, Nigeria. Detection of Cocoa Swollen Shoot Virus (CSSV) in the leaf samples was done by Enzyme Linked Immunosorbent Assay (ELISA) using antiserum raised against mild and severe strains of the virus. CSSV was readily detected in 60% of the samples by Antigen Coated Plate ELISA (ACP-ELISA) but not with the Protein A Sandwich ELISA (PAS-ELISA). Of the positive samples, 16.67% reacted to both the mild and severe strains of the virus. CSSV was detected in most of the positive samples from farmers’ plot 1 (68.96%) than from farmers’ plot 2 and CRIN respectively (54.16 and 55.55%). The result has re-established the natural occurrence of the virus in Nigeria and thus calls for a re-evaluation of the economic importance of the disease in Nigeria.
Sobre el retiro de la sibutramina en el Perú About the withdrawal of sibutramine in Peru
Víctor Dongo
Revista Peruana de Medicina Experimental y Salud Pública , 2010,
Global Existence of Solutions for the Einstein-Boltzmann System in a Bianchi Type I Space-Time
Norbert Noutchegueme,David Dongo
Physics , 2005, DOI: 10.1088/0264-9381/23/9/013
Abstract: We prove a global in time existence theorem, for the initial value problem for the Einstein-Boltzmann system, with arbitrarily large initial data, in the homogeneous case, in a Bianchi type I space-time
An Exploratory Study of Male Adolescent Sexuality in Zimbabwe: The Case of Adolescents in Kuwadzana Extension, Harare
Sandra Bhatasara,Tafadzwa Chevo,Talent Changadeya
Journal of Anthropology , 2013, DOI: 10.1155/2013/298670
Abstract: Although young people in Zimbabwe are becoming sexually active at a very early age, there is no unified body of knowledge on how they regard sex and construct sexuality and relationships. In many circumstances adolescence sexual agency is denied and silenced. This study explored adolescents’ discourses on sexuality, factors affecting adolescent sexuality, and sexual health. Fusing a social constructionist standpoint and an active view of agency, we argue that the way male adolescents perceive and experience sexuality and construct sexual identities is mediated by the sociocultural context in which they live in and their own agency. Although adolescents are mistakenly regarded as sexual innocents by society, we argue that male adolescents are active social agents in constructing their own sexual realities and identities. At the same time, dominant structural and interactional factors have a bearing on how male adolescents experience and generate sexuality. 1. Introduction This study explores empirically adolescents’ construction of sexuality. According to Nyanzi [1] sexuality is constructed as the domain exclusive to adults with preconditions of physical and social maturity. Thus, notions of child sexuality are often viewed as taboo, antithetical, nonissues, or even dangerous and cause for moral panic. Such perceptions of “unknowledgeable or ill-informed adolescents” and “high-risk adolescents” are rife in the literature on youth and HIV/AIDS [2]. Adult sexual cultures and religious and moral discourses are deployed or implicated in positioning adolescent sexuality as taboo. Putting sexuality and children together remains problematic and morally troubling regardless of policy efforts to change this [3]. As noted by Renold [4], underlying this trouble are familiar ideologies that associate school-going learners with sexual innocence which creates the myth of an asexual child who must be protected from corrupting sexual information, producing a regulatory mechanism through which morality, sexuality, and young people at school are framed. Longstanding tropes of sexual innocence position the child as an object of concern, thwarting sexual curiosity [5]. In spite of such narrow conceptualizations of children, a number of studies demonstrate that adolescents are active sexual beings. Against representations that associate children with sexual innocence, this study examined adolescents’ discourses on notions of sexuality as well as their sexual health as it has been demonstrated that their needs are different from those of adults. The focus of the study is
Pensamento e linguagem: percurso piagetiano de investiga??o
Montoya, Adrián Oscar Dongo;
Psicologia em Estudo , 2006, DOI: 10.1590/S1413-73722006000100014
Abstract: this study aims at discussing piaget's course of investigation about the origins and the existent relationship between language and thought. in order to meet our goals, firstly, we will analyze the author's initial works about the evolution and socialization of children's thought and language, emphasizing the exogenous explanation of their progress. secondly, we will investigate the research studies carried out by piaget, during the 30's and 40's decades, about the motor-sensory origins of thought and language, focusing the endogenous explanation of their progress. thirdly, we will analyze the psycholinguistic studies related to normal and disabled children, which confirms piaget's thesis relevance, concerning the origins of thought and language. finally, we will point out some of the author's conclusive theses, based on his theoretical framework, concerning the critiques to contemporary empirical and positivist theories.
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