Digital Commons Network^™

Contour Mapping For Rain Rate And Rain Attenuation In Microwave And Millimetre Wave Earth-Satellite Link Design In Tropical Tanzania, Promota Haule Linga, Hashim Uledi Iddi, Mussa Kissaka

Tanzania Journal of Science

Rain rate and rain attenuation predictions are vital in the analysis of the performance of earth-satellite link at higher frequencies beyond 10 GHz for satellite system planning. This study intended to address lack of rain attenuation profile based on local rainfall data collected from various parts of the country. A one-minute integration time rainfall rate used to estimate the rain-induced attenuation was obtained by converting the annual rainfall data collected for 40 years from 22 locations in Tanzania using a combination of Chebil and refined Moupfouma-Martin methods. The International Telecommunication Union (ITU) standard was used to predict attenuation caused by …

Antibacterial Activities Of The Extracts Of Allium Sativum (Garlic) And Allium Cepa (Onion) Against Selected Pathogenic Bacteria, Sherifat O. Enejiyon, Al-Hassan A. Abdulrahman, Abdulameen S. Adedeji, Ramatu Abdulsalam, Mary U. Oyedum

Tanzania Journal of Science

Although many antibiotics have been developed against bacterial diseases, the problems of antibiotic resistance and toxicity have made the continuous search for newer drugs an existential necessity. This study determined the phytochemical components and antibacterial activities of Allium sativum and Allium cepa against Salmonella typhi, Staphylococcus aureus, Streptococcus pneumoniae, Klebsiella pneumoniae and Escherichia coli. The phytochemical analysis was carried out using standard methods. The antibacterial activities of the aqueous, ethanol and acetone extracts of both plants at different concentrations were determined against all the test organisms using agar well diffusion method. All the extracts were found to contain important phytochemicals …

Verification Of Depth Dose Curves Derived On Beeswax, Paraffin And Water Phantoms Using Fluka Monte Carlo Code, Khamis O. Amour, Peane P. Maleka, Khamza Maunda, Mohammed S. Mazunga, Peter K. Msaki

Tanzania Journal of Science

This study aimed on the investigation of depth dose curves from beeswax, water and paraffin phantoms using FLUKA Monte Carlo code. In order to test the validity of FLUKA code, computational values of depth doses in water, beeswax and paraffin have been obtained using this code. The relative average coefficient of variation of percentage depth dose was observed to be less than 0.38% between beeswax and water, below 0.2% between water and paraffin and 0.98% between beeswax and British Journal of Radiology supplement 25 data. The deviations of percentage depth doses within the beeswax phantom material were also calculated and …

In Vitro Antioxidant Activities Of Ethanol, Ethyl Acetate And N-Hexane Extracts Of Mangifera Indica Leaves, Yunusa O. Ibrahim, Musa B. Busari, Ruqayyah S. Yusuf, Rabiat U. Hamzah

Tanzania Journal of Science

Mangifera indica leaves have been in use in folk medicine since ancient time, for the treatment and/or management of numerous health complications. In this study, total phenols and flavonoids contents, as well as in vitro antioxidant activities of ethanol, ethyl acetate and n-hexane extracts of M. indica leaves were determined and compared. The in vitro antioxidant activities were determined using 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging, ferric reducing antioxidant power, and inhibition of lipid peroxidation assays, respectively. The total phenols were found to be present in the descending order of; ethanol extract > ethyl acetate extract > n-hexane extract, while flavonoids were observed …

Dengue Vector Distribution And Their Infection Status In Selected Regions In Tanzania, Anitha Philbert, Amina Msonga

Tanzania Journal of Science

Dengue fever is an important arboviral infection globally. Tanzania has experienced multiple dengue outbreaks since 2010 leading to mortalities and public distress. Dengue is caused by viruses which are transmitted to humans by vector mosquitoes. Nevertheless, the abundance, distribution and extent of viral infections of these vectors are poorly understood. The aim of this study was to characterize dengue vectors and determine their virus infection rates. Adult mosquitoes were collected from selected regions in Tanzania including Dar es Salaam, Tanga, Coast, and Arusha regions using CO2 baited mosquito magnet traps between December 2018 to February 2019, additional samples were collected …

Sensitivity Analysis And Uncertainty Parameter Quantification In A Regression Model: The Case Of Deforestation In Tanzania, Thadei Sagamiko, Nyimvua Shaban, Isambi S. Mbalawata

Tanzania Journal of Science

In this paper a multiple regression model for the economic factors and policy that influence the rate of deforestation in Tanzania is formulated. Sensitivity analysis for parameters of explanatory variables using one-at-a time and direct methods is carried out and the model is fitted by classical least square (LSQ) and Markov Chain Monte Carlo (MCMC) methods. Uncertainty quantification of parameters by adaptive Markov Chain Monte Carlo methods is performed. The coefficient of determination indicates that 87% of deforestation rate is explained by explanatory variables captured in the model. Household poverty rate is found to be the most sensitive factor to …

Selected Under-Exploited Plant Oils In Nigeria: A Correlative Study Of Their Properties, Ikhazuagbe H. Ifijen, Adachukwu N. Nkwor

Tanzania Journal of Science

This study examined the physicochemical properties of seven under-exploited plant oils in Nigeria, namely; Hevea brasiliensis seed oil (HBSO), Prunus dulcis seed oil (PDSO), Afzelia africana aril cap oil (AAACO), Jatropha curcas seed oil (JCSO), Sesamum indicum seed oil (SISO), Canarium schweinfurthii seed oil (CSSO) and Hura crepitans seed oil (HCSO). Characteristics such as colour, percentage yield, specific gravity, freezing/melting point, acid value, free fatty acid, iodine value, and saponification value were investigated. The results showed that they have different colours and are liquid at room temperature. The percentage yield of the extracted oils varied from 34 to 55.39%. The …

Assessment Of Genetic Diversity Of The Wild Rice (Oryza Longistaminata) Populations In Tanzania Using Microsatellite Markers, Hashim M. Mangosongo, Emerald E. Mneney, Jagger Harvey, Martina Kyallo

Tanzania Journal of Science

The genetic diversity of 132 samples of the perennial wild rice (Oryza longistaminata) populations from selected districts (Bagamoyo, Kibaha, Kilombero and Mbarali) in Tanzania was evaluated using twenty eight microsatellite markers. Genomic DNA was extracted using standard protocols. Polymerase Chain Reaction (PCR) was carried out in a total reaction volume of 10 µL, using Touchdown protocol. It was found that all 28 microsatellite markers generated polymorphic patterns, with average Polymorphic Information Content (PIC) value of 0.631. Moreover, a total of 243 alleles were detected by the 28 markers, with average of 8.68 alleles per marker. The percentages of genetic variations …

Craniometrics Analysis For Ontogenetic Physiognomy And Sexual Dimorphism In Emin’S Silvery Mole-Rats (Heliophobius Argenteocinereus Emini: Bathyergidae) From Tanzania, Jestina V Katandukila

Tanzania Journal of Science

Emin’s silvery mole-rat, the Heliophobius argenteocinereus emini belongs to a family Bathyergidae. The Heliophobius argenteocinereus emini (Noak, 1894) isinformation on ontogenetic physiognomy and status of sexual dimorphism in H. a. emini is missing. The present study intended to fill gaps on ontogenetic characteristics and status of sexual dimorphism in these mole-rats by comprehensively examining 55 skulls. Based on teeth eruption and wear, the dental formula of 1/1, 0/0, 1/1, 3/3 is reported for the first time, and subsequently established eight relative age classes. This information was key to the assessment of ontogenetic variations between sexes and age classes. The multidisciplinary …

Comparison Of Seaweed Growth, Fish Abundance And Diversity In Deep Water Floating Raft With Tubular Nets And Shallow Water Off-Bottom Lines Seaweed Farms, Batuli M. Yahya, Saleh A. S. Yahya, Aviti J. Mmochi, Narriman S. Jiddawi

Tanzania Journal of Science

This study compared the growth performance of Eucheuma denticulatum, fish abundance and diversity between deep water (using tubular nets) versus shallow water (off-bottom) seaweed farming methods. For each farming method, three plots were set and fish abundance, diversity and seaweed growth rates were measured at intervals of 15 days. Belt transects measuring 10 m x 4 m each, were established on seaweed farms for fish observations. Fish were identified to the lowest possible taxonomic level by underwater census. The results showed that the growth rate of E. denticulatum in deep water farms was slightly higher at an average daily growth …

A Review On Ecosystem Services And Their Threats In The Conservation Of Nyando Wetland, Kisumu County, Kenya, Joseph K. Maithya, Felix L .M. Ming’Ate, Sammy C. Letema

Tanzania Journal of Science

Wetlands are vital ecosystems as they are essential to human health, wellbeing, ecological integrity and national development as well as in the attainment of the Sustainable Development Goals. However, despite their contributions to human wellbeing, they have been destroyed and degraded over years. The aim of this paper is to review literature on the ecosystem services in Nyando wetland ecosystem and how they have been helpful to the well-being of its residents and also to determine the threats to the Nyando ecosystem services. A total of 88 documents were reviewed out of 20,400 documents from the Google engine search. It …

Security Model For Tracking Creation Of Mobile Money Using Transport Layer Security Protocol, Sigsbert Rwiza, Mussa Kissaka, Kosmas Kapis

Tanzania Journal of Science

Mobile Network Operator (MNO) financial service model has security vulnerabilities in addressing verification of cash and mobile money. For instance, monthly returns are transferred in plain text from banks and MNOs to financial regulators. This may result to failure of financial regulators in detecting creation of fake mobile money. This study was conducted to develop a security model for tracking creation of mobile money using Transport Layer security protocol as a way of protecting returns in transit from banks and MNOs to financial regulators. The proposed model was developed using insights from literature, function decomposition and composition techniques and was …

Anti-Diabetic Activity Of Chrysophyllum Albidum (G. Don) Stem Bark In Alloxan-Induced Type 1 Diabetic Female Wistar Rats, Babalola Ola Yusuf, Musa Toyin Yakubu, Musbau Adewumi Akanji

Tanzania Journal of Science

Anti-diabetic activity of aqueous extract of Chrysophyllum albidum stem bark (AECASB) in female Wistar rats was investigated to confirm or refute the purported use and the underlying mechanism of action of C. albidum stem bark in the management of type 1 diabetes in Nigeria traditional medicine. Seventy female rats (180.60 ± 8.50 g) were assigned into seven groups. Rats in Group 1 (non-diabetic) were orally administered 1 mL of distilled water, while animals in Groups 2-7 were made diabetic and orally administered 1 mL of distilled water, 2.5 mg/kg body weight (bwt) of glibenclamide, 25, 50, 100 and 200 mg/kg …

Parental Concerns And Uptake Of Childhood Vaccines In Rural Tanzania – A Mixed Methods Study, Lavanya Vasudevan, Joy Noel Baumgartner, Sara Moses, Esther Ngadaya, Sayoki Godfrey Mfinanga, Jan Ostermann

Faculty Publications

Background

Vaccine hesitancy has been recognized as an important barrier to timely vaccinations around the world, including in sub-Saharan Africa. In Tanzania, 1 in 4 children is not fully vaccinated. The objective of this mixed methods study was to describe and contextualize parental concerns towards vaccines in Tanzania.

Methods

Between 2016 and 2017, we conducted a cross-sectional survey (n = 134) and four focus group discussions (FGDs, n = 38) with mothers of children under 2 years of age residing in Mtwara region in Southern Tanzania. The survey and FGDs assessed vaccination knowledge and concerns and barriers to timely vaccinations. …

Libraries Without Walls And Open And Distance Learning In Africa: The Nigerian Experience, Ukoha O. Igwe

Library Philosophy and Practice (e-journal)

Open and Distance Learning (ODL) is gradually gaining ground in Africa. Nigeria is a newcomer in the Open and Distance Learning paradigm. The experiences of several open and distance learning institutions such as the Open University of United Kingdom (OUUK), Athabasca University (Canada’s Open University), Open University of Hong Kong, Indira Gandhi National Open University, (IGNOU), and University of South Africa (UNISA), have provided a baseline for the take-off of the only Open University in Nigeria – the National Open University of Nigeria (NOUN). The successful take-off of NOUN is not without the incorporation of functional libraries. Effective library support …

Marketing Of Library Product And Services In The Government Undergraduate College Libraries: A Comparative Study, Debdas Debdas Mondal, Debal C. Kar Dr

Library Philosophy and Practice (e-journal)

Purpose of the present study is to evaluate, awareness and use of marketing of Library services and products for better use of the library resources in the Government undergraduate college libraries in the sub-division of Durgapur, West Bengal, India. The study has used the two most common methods of survey, namely the descriptive survey method and the questionnaire tool through simple random sampling. The study shows that Computerization of the library system plays a vital role in the present scenario for better use of library services and information products as well as library resources. Both the users and the staff …

Use Of Electronic Resources By The Academics: A Case Study From University Of Jaffna, Sri Lanka, Pradeepa Wijetunge Dr., Abhirami Sivasanthiran Ms.

Library Philosophy and Practice (e-journal)

The purpose of this paper is to investigate the use of electronic resources (e-resources) by the academic staff of University of Jaffna, Sri Lanka. The study aimed to determine their awareness and perceptions towards the e-resources, training, and the factors affecting the usage. Convenient sampling method was used to select a sample of 37 academics from a population of 431. The study adopted both quantitative and qualitative approaches, by using a questionnaire and a discussion. The study revealed that the majority often uses Internet to fulfill their information needs, they have learnt about the availability of the e-resources from their …

Solar Irradiance And Enso Affect Food Security In Lake Tanganyika, A Major African Inland Fishery, Michael M. Mcglue, S. J. Ivory, J. R. Stone, A. S. Cohen, T. M. Kamulali, J. C. Latimer, M. A. Brannon, I. A. Kimirei, M. J. Soreghan

Earth and Environmental Sciences Faculty Publications

Food security in a warming world is a grave concern for rapidly growing impoverished populations. Low-latitude inland fisheries provide protein for millions of rural poor, yet the impacts of high-frequency climate oscillations on these aquatic ecosystems are unknown. Here, we present a sub-annual-to-annual resolution paleolimnological reconstruction of upwelling, productivity, and algal composition at Lake Tanganyika, one of Africa's largest landlocked fisheries. The data reveal increases in diatom production at centennial-scale solar irradiance maxima, and interannual variability in upwelling linked to La Niña. Our study shows that interactions between global climatic controls and El Niño-Southern Oscillation teleconnections exert profound influences on …

The Western Media And The Portrayal Of The Rwandan Genocide, Cherice Joyann Estes

History in the Making

On December 9, 1948, the United Nations established its Convention on the Prevention and Punishment of the Crime of Genocide. Genocides, however, have continued to occur, affecting millions of people around the globe. The 1994 genocide in Rwanda resulted in an estimated 800,000 deaths. Global leaders were well aware of the atrocities, but failed to intervene. At the same time, the Western media's reports on Rwanda tended to understate the magnitude of the crisis. This paper explores the Western media's failure to accurately interpret and describe the Rwandan Genocide. Recognizing the outside media’s role in mischaracterizations of the Rwanda situation …

Low Use Of Vacuum Extraction: Health Care Professionals’ Perspective In A University Hospital, Dar Es Salaam, Henrik Makokha-Sandell, Andrew Mgaya, Johanna Belachew, Helena Litorp, Hussein Kidanto, Birgitta Essén

Faculty of Health Sciences, East Africa

Background Use of vacuum extraction (VE) has been declining in low and middle income countries. At the highest referral hospital Tanzania, 54% of deliveries are performed by caesarean section (CS) and only 0.8% by VE. Use of VE has the potential to reduce CS rates and improve maternal and neonatal outcomes but causes for its low use is not fully explored.

Method During November and December of 2017 participatory observations, semi-structured in-depth interviews (n = 29) and focus group discussions (n = 2) were held with midwives, residents and specialists working at the highest referral hospital in Tanzania. Thematic analysis …

Investigating The Effect Of Assessment Feedback On Student's Learning And Performance In Mathematics: A Case Of Two Community Secondary Schools In Moshi Municipality, Tanzania, Alex Mlemba

Master of Education

Performance in basic mathematics in secondary schools at CSEE has been on decline for many years. Several factors such as family support, myth, beliefs about mathematics as well as teaching and learning strategies have been associated with this poor performance. Assessment feedback being at the centre of formative assessment is among the factors that directly influence teaching and learning process. Therefore, this study investigated the effect of assessment feedback on students learning and performance in mathematics in form three secondary classrooms in Moshi Municipality. The study explored the nature of assessment feedback used by teachers, perceived effect of feedback on …

Birth Preparedness And Complication Readiness Among Women Of Reproductive Age In Kenya And Tanzania: A Community-Based Cross-Sectional Survey, James Orwa, Samwel Gatimu, Michaela Mantel, Stanley Luchters, Micheal Mugerwa, Sharon Brownie, Leonard Subi, Secilia Mrema, Lucy Nyaga, Grace Edwards, Loveluck Mwasha, Kahabi Isangula, Edna Selestine, Sofia Jadavji, Rachel Pell, Columba Mbekenga, Marleen Temmerman

Obstetrics and Gynaecology, East Africa

Background: Delayed health-seeking continues to contribute to preventable maternal and neonatal deaths in low resource countries. Some of the strategies to avoid the delay include early preparation for the birth and detection of danger signs. We aimed to assess the level of practice and factors associated with birth preparedness and complication readiness (BPCR) in Kenya and Tanzania.

Methods: We conducted community-based multi-stage cross-sectional surveys in Kilifi and Kisii counties in Kenya and Mwanza region in Tanzania and included women who delivered two years preceding the survey (2016–2017). A woman who mentioned at least three out of five BPCR components was …

Improving Data For Decision-Making: A Toolkit For Cervical Cancer Prevention And Control Programmes, Elkanah Omenge, Edwin Were, Oliver Rode, Kapten Muthoka, Michael Byczkowski, Heike Sartor, Davy Vanden Broeck, Dietmar Schmidt, Miriam Reuschenbach, Magnus Von Knebel Doeberitz

Obstetrics and Gynaecology, East Africa

Background: Screening of unvaccinated women remains essential to mitigate the high morbidity/mortality of cervical cancer. Here, we compared visual inspection with acetic acid (VIA), recommended by WHO as the most cost-effective screening approach in LMICs, with HPV-based screening, and usage of p16INK4a/Ki-67 dual stain cytology.

Methods: We prospectively enrolled women participating in a VIA-based cervical cancer screening program in two peri-urban health centers of Kenya. Consenting women had a VIA examination preceded by collection of a liquid-based cytology sample from the cervix stored in PreservCyt medium (Hologic®). Analysis of all samples included a hrHPV DNA test and evaluation of a …

Re-Evaluating The Strength Of Pit-Latrine Faecal Sludge From Dynamic Cone Penetrometer Test Data., Yasmine Shafiq, Stuart Haigh, Rochelle Holm, Alison Parker

Faculty and Staff Scholarship

In 2017, 55% of the global population were without safely managed sanitation services. On-site sanitation solutions, such as pit latrines, provide the majority of sanitation coverage across developing countries. Appropriate technologies are required in order to safely empty these latrines without damage to people or the environment. The design of appropriate emptying technologies can be hampered by a lack of knowledge of the mechanical properties of the waste, such as its strength. This paper will develop a calibration for a dynamic cone penetrometer to give accurate measurements of faecal sludge strength against a standard scale, rendering existing data comparable. It …

Introduction Of An Advanced Practice Nurse Program In Kenya: A New Era In Nursing Education, Sheila Shaibu, Eunice Wambui Ndirangu, Eunice Siaity, Gladys M. Mbuthia, Rachel Kimani, Isabel Kambo

International Nursing Research Congress (INRC)

This presentation will discuss the role of collaboration with stakeholders (students, alumni, clinicians and regulators) in country and global collaboration with partners in the development of an Advanced Practice program to meet national indicators. It also highlights the merits of inter-professional and intra-professional collaboration.

Amjambo Africa! (September 2020), Kathreen Harrison

Amjambo Africa!

In This Issue...

Indigo Arts Alliance.....................p.2

publisher’s editorial.....................p.4

registering to vote.......................p.4

French............................................p.5

Swahili...........................................p.6

Somali............................................p.7

School resource officers ..............p.8

U.S.-Canada border.....................p.8

News from Africa.........................p.9

Finance/buying a home.............p.10

Guest columns..............11/14/20/21

World market basket...........p.12/13

Héritier Nosso............................p.15

Community org. News........p.16/17

Kinyarwanda..............................p.18

portuguese .................................p.19

outdoor learning.......................p.23

bus Shelters................................p.23

Navigating Cross-Cultural Research: Methodological And Ethical Considerations, Tanya Broesch, Alyssa N. Crittenden, Bret A. Beheim, Aaron D. Blackwell, John A. Bunce, Heidi Colleran, Kristin Hagel, Michelle Kline, Richard Mcelreath, Robin G. Nelson, Anne C. Pisor, Sean Prall, Ilaria Pretelli, Benjamin Purzycki, Elizabeth A. Quinn, Cody Ross, Brooke Scelza, Kathrine Starkweather, Jonathan Stieglitz, Monique Borgerhoff Mulder

Anthropology Faculty Research

The intensifying pace of research based on cross-cultural studies in the social sciences necessitates a discussion of the unique challenges of multi-sited research. Given an increasing demand for social scientists to expand their data collection beyond WEIRD (Western, educated, industrialized, rich and democratic) populations, there is an urgent need for transdisciplinary conversations on the logistical, scientific and ethical considerations inherent to this type of scholarship. As a group of social scientists engaged in cross-cultural research in psychology and anthropology, we hope to guide prospective cross-cultural researchers through some of the complex scientific and ethical challenges involved in such work: (a) …

“When I Breastfeed, It Feels As If My Soul Leaves The Body”: Maternal Capabilities For Healthy Child Growth In Rural Southeastern Tanzania, Zaina Mchome, Sepideh Yousefzadeh, Ajay Bailey, Hinke Haisma

Open Access archive

The burden of childhood stunting in Tanzania is persistently high, even in high food-producing regions. This calls for a paradigm shift in Child Growth Monitoring (CGM) to a multi-dimensional approach that also includes the contextual information of an individual child and her/his caregivers. To contribute to the further development of CGM to reflect local contexts, we engaged the Capability Framework for Child Growth (CFCG) to identify maternal capabilities for ensuring healthy child growth. Ethnographic fieldwork was conducted in Southeastern Tanzania using in-depth interviews, key informant interviews, participant observation, and focus group discussions with caregivers for under-fives. Three maternal capabilities for …

Inadvertent Stone Migration During Pneumatic Lithotripsy: Still A Conundrum In The 21st Century, Ali Akbar Zehri, Miten Patel, Philip Adebayo, Authar Ali

General Surgery, East Africa

Currently, an ideal gadget to stop retrograde stone migration remains a holy grail, and the hunt for such a device is still ongoing in the 21st century. The quest for an ideal instrument is driven by the need to reduce cost, minimize ancillary procedure rates, reduce the device's operative time, and improve the stone-free rate. The purpose of the present review is to provide an update on the use of preventive measures that are used to stop retrograde stone migration during pneumatic lithotripsy for ureteric stone management.

Inadvertent Stone Migration During Pneumatic Lithotripsy: Still A Conundrum In The 21st Century, Ali Akbar Zehri, Miten Patel, Philip Adebayo, Authar Ali

General Surgery, East Africa

Currently, an ideal gadget to stop retrograde stone migration remains a holy grail, and the hunt for such a device is still ongoing in the 21st century. The quest for an ideal instrument is driven by the need to reduce cost, minimize ancillary procedure rates, reduce the device's operative time, and improve the stone-free rate. The purpose of the present review is to provide an update on the use of preventive measures that are used to stop retrograde stone migration during pneumatic lithotripsy for ureteric stone management.

Currently, an ideal gadget to stop retrograde stone migration remains a holy grail, …