Browsing School of Science, Engineering and Health by Issue Date
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Ireri, Jane Wanja (July , 2010)[more][less]
Abstract: Hydromagnetics involves the effect of externally impressed magnetic field on the onset of thermal instability in electrically conducting fluids. In broad terms, the subject of hydromagnetics is concerned with the ways in which magnetic fields can affect fluid behavior. These fluids include liquid metals and highly ionized gas-like substances called plasmas. When we consider a fluid which has the property of electrical conduction; and suppose also that magnetic fields are prevalent. The electrical conductivity of the fluid and the prevalence of magnetic fields contribute to effects of two kind: first, by motion of the electrically conducting fluid across the magnetic lines of force, electric currents are generated and the associated magnetic fields contribute to changes in the existing fields; and second, the fact that the fluid elements carrying currents transverse magnetic lines of force contributes to additional forces acting on the fluid elements. It is in this two fold interaction between the motions and the fields that is responsible for patterns of behavior which are often unexpected and striking. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4153 Files in this item: 1
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Kang, Joo-Oh; Jeong, Dong Kwan; Lee, Dong-Kyu; Kang, Hyesook; Kiarie-Makara, Martha (Entomological Research, January , 2011)[more][less]
Abstract: A granular formulation of 1.0% temephos (temephos G) was tested for its efficacy in mosquito larval control, residual effects and effects on non-target microorganisms. Culex pipiens complex in septic tanks in Yangsan, Republic of Korea were used for this study. Microorganisms in the same septic tanks were used for study of non-target organisms. After the application of temephos G at the rates of 2.0 and 5.0 mg/L to selected septic tanks, mortalities were recorded for 50 days. The effect of temephos G on non-target organisms was studied by evaluating its effects on the bacterial populations in the treated septic tanks. It was observed that using 1.0% temephos G at a rate of 2.0 mg/L resulted in 100% mortality against Cx. pipiens larvae by the eighth day after treatment. The residual activity of temephos G was observed to continue for a time; for example 29 days after treatment, average larval mortality rates of >68.0% were observed for both concentrations. At the 50th day after treatment, the mortality rates of the Cx. pipiens larvae were observed to decrease to below 42.7% for both concentrations. Application of temephos G did not have significant effects on the bacteria populations in the septic tanks. Since temephos did not seem to have any major effects on the microorganisms, it was concluded that it is a safe and effective larvicide to use in the septic tanks at a rate of 2.0–5.0 mg/L of 1.0% temephos G. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3975 Files in this item: 1
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Kinuthia, Geoffrey K.; Lugalia, Reuben; Mwanyumba, Panuel J.; Ngeiywa, , Moses M.; Anjili, Christopher O.; Tonui, Willy K. (African Journal of Health Sciences, June , 2011)[more][less]
Abstract: A laboratory based study was designed to characterize 43 cryo-preserved Leishmania-like flagellates. These Leishmania-like flagellates were originally obtained from non-human hosts that included spiny mice (Acomys subspinosus), plated lizards (Gerrosaurus major) and sand flies of the Genus Sergentomyia caught at Masinga location, Machakos District in Kenya. Morphological features and isoenzyme banding patterns of the flagellates were studied. The isoenzyme markers which were used for isoenzyme electrophoresis included Malate dehydrogenase (MDH), Phosphoglucomutase (PGM), Glucose phosphate isomerase (GPI), Glucose 6-phosphate dehydrogenase (G6PD), Malic enzyme (ME), 6 phosphogluconate dehydrogenase (6PGD) and Mannose phosphate isomerase (MPI). The isoenzyme banding patterns of the flagellates’ lysates were compared with those of six WHO Leishmania reference strains and those of seven well characterized reference strains of Trypanosoma, Crithidia, Herpetomonas and Leptomonas species. The results showed that the morphological changes of the Leishmania-like flagellates in the growth medium were indistinguishable from those of Leishmania WHO reference strains used. The isoenzyme profiles of the flagellates were all distinguishable from the reference strains used except for isolate NLB-1236 from G. major which had an enzyme profile identical to that of L. tropica (NLB-305) in 6 enzymes (MDH, GPI, MPI, ME, PGM, and G6PD). The banding pattern of isolate NLB-1261 from A. subspinosus was indistinguishable from that of L. major (NLB-326) in 3 enzymes only (MDH, GPI and ME) while isolate NLB-1231 from A. subspinosus had an enzyme profile identical to those of L. tropica (NLB-305) and L. arabica (NLB-664) in six enzymes (MDH, GPI, ME, PGM, MPI, and 6PGD). More than 80% of the Leishmania-like flagellates had enzyme profiles indistinguishable from each other, in all the isoenzyme markers. The morphological traits of the flagellates suggested that they were Leishmania or strains closely related to Leishmania. Isoenzyme analysis suggested that Sergentomyia sand flies most likely feed on both lizards (reptiles) and rodents (mammals). There is need to carry further investigations on NLB-1236 (from plated lizards), NLB-1261 (from wild spiny mice) and NLB-1231 (from wild spiny mice). Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4003 Files in this item: 1
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Kinuthia, Geoffrey; Gicheru, Michael Muita; Ngure, Peter; Kabiru, Ephantus W. (Community Health, July , 2011)[more][less]
Abstract: Abstract Unhygienic practices have been associated with the spread of parasitic and bacterial infections in rural areas. This study was designed to verify the link between the frequencies of malaria and typhoid fever with selected rural practices in Njoro District, Kenya. A cross-sectional study involving observations, questionnaires and interviews was conducted to determine the socio-economic variables and practices/lifestyles in 336 randomly selected homesteads. Frequencies of malaria and typhoid fever in two randomly selected health centers were determined through a retrospective study for the period from 2004 to 2009. The respondents had large families (68%), low education level (67%) and high responsibility burden (67%). Individuals who did not boil drinking water constituted 61%. Boiling drinking water was less common among the poor, Odds Ratio (OR) of 2.36, v2 = 9.88, 95% Confidence Interval (CI) of 1.38–4.03. Respondents who washed their hands in a basin after using the latrines comprised 79.8% while 4.8% did not. 18.5% of the respondents did not use a soap to wash their hands after using the latrine. One third (33.6%) of the homesteads had dirty and inappropriate pit latrines while 2.7% of the homesteads lacked latrines. Failure to use mosquito bed nets was more likely to occur among the poor respondents, OR of 1.44, v2 = 1.74, 95% CI of 0.84–2.48. The frequencies of malaria and typhoid fever were an average of 29 and 24% respectively. Malaria and typhoid fever cases were relatively frequent due to adoption of inappropriate lifestyles and practices that predisposed the residents to infectious agents. Poverty seemed to play a significant role in the spread of malaria and typhoid fever. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4166 Files in this item: 1
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Ngure, Veronica; Simiyu, Gelas; Sitati, Noah; Kinuthia, Geoffrey; Shisia, Silvanus (Laikipia University College, Moi University, Daystar University, September 1, 2011)[more][less]
Abstract: This paper reports on findings using hair as biomonitor marker for heavy metals (Pb, Cd, Cr and Cu) from geological source and exposure through regular maize consumption among selected male adults in Eldoret Municipality who had resided for five continous years. Concentration of Pb and Cu in anthropogenic pathways, while Cd and Cr reflected accumulation from the human activities. Usually higher concentration of heavy metals hair samples suggest longer term exposure. The estimated intake of Cd and Cr from maize in one zone associated with high concentration of the metals from geological source was appreciably above the respective recommended daily allowance (RDA), signifying possible health risks to humans. Significant correlations between Pb, Cd and Cu in hair and heavy metals from maize consumed suggested maize consumption as possible pathways of exposure of heavy metals in humans. Possible health risks from heavy metals were likely due to consumption of higher quantities of maize contaminated from geological and human activities Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4167 Files in this item: 1
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Ayiro, Laban Peter; Sang, James K. (Emotional Intelligence – New Perspectives and Applications, 2012)
[more][less]Abstract: The notion of quality is hard to define precisely, especially in the context of tertiary education where institutions have broad autonomy to decide on their own visions and missions. Any statement about quality implies a certain relative measure against a common standard; in tertiary education, such a common standard does not exist. Various concepts have evolved to suit different contexts ranging from quality as a measure for excellence to quality as perfection, quality as value for money, quality as customer satisfaction, quality as fitness for purpose, and quality as transformation (in a learner) (SAUVCA 2002). Some institutions have adopted the International Standards Office (ISO) approach in some of their activities. Depending on the definition selected, quality implies a relative measure of inputs, processes, outputs or learning outcomes. Institutions, funders, and the public need some method for obtaining assurance that the institution is keeping its promises to its stakeholders. This is the primary goal of quality assurance. The leadership of the quality assurance directorates in universities has therefore come into sharp focus. URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/2837 Files in this item: 1
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Kinuthia, Geoffrey; Afolayan, FID; Ngure, V; Anjili, CO (African Journal of Health Sciences, January , 2012)[more][less]
Abstract: The study was designed to investigate on selected practices among rural population, and their likely contribution to the spread of amoebiasis (E. histolytica) and giardiasis (G. lamblia). A cross sectional study was carried out in three villages, namely Kikapu, Piave and Belbar in Njoro District, Kenya. Questionnaire, interviews and personal observations were used to obtain data from 336 randomly selected consenting individuals in homesteads in the three villages. A retrospective study was further carried out to establish the prevalence of E. histolytica and G. lamblia among outpatients attending two randomly selected health centers in the study area. Majority of the respondents' highest education level was basic primary school education (61%), unemployment (98%) and with a monthly expenditure of less than 2200 Kenya Shillings or 28 US Dollars (81%). Eighty percent of the respondents were classified under low economic status. Eighty two percent reported lack of piped water and boiling of drinking water was less likely to occur among the low economic status respondents (Odds ratio (OR) = 0.423, 2 = 9.88; 95% CI of-5.74 to 6.58). However, washing of hands with soap after using a latrine seemingly was not influenced by economic status of the respondents (OR = 1; 2 = 0; 95% CI = 0). The level of education seemed to influence on the adoption of risky practices, such as, failure to boil drinking water was more likely to occur among respondents who had a low academic level (OR = 0.84, 2 = 0.04, 95% CI of-2.27 to 3.95). The stool tests records at Njoro PCEA health center showed that the prevalence of E. histolytica (20.83%) and G. lamblia (20.32%) were higher than the corresponding prevalence at Njoro County Council health center which were 1.34% and 0.00% respectively. Concurrent infections of E. histolytica and G. lamblia were absent in the two health centers. The trend of E. histolytica and G. lamblia followed an alternating pattern, in which an increase in one directly corresponded to a decrease in the other and vice versa in the two health centers. It was concluded that poverty and low education levels were significant factors that influenced on the adoption of risky lifestyles that were likely to enhance parasitic infections. There is a need for reliable diagnostic methods other than direct microscopy for E. histolytica and G. lamblia stool tests in order to minimize the wide variation of the results in the two health centers. Public health education should also be enhanced to discourage the adoption of risky practices. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4165 Files in this item: 1
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Ngure, Veronica; Sitati, Noah; Shisia, Silvanus; Simiyu, Gelas; Kinuthia, Geoffrey; Kelonye, Festus (IOSR Journal Of Environmental Science, Toxicology And Food Technology, December , 2013)[more][less]
Abstract: Heavy metals were analyzed in soils, food crops and male scalp hair samples collected from two age group subjects; adults (18 - 45 years) and old age (46 - 55 years) males from polluted and relatively less polluted areas in Eldoret Municipality environs, Kenya. The samples used were collected from same sites as the individuals who had stayed in the sampled regions for more than five years. The samples were digested using acids and analyzed using Atomic Absorbtion Spectrometry (AAS). The results revealed that the consumption of food crops grown on contaminated soils have significantly increased the concentrations of selected metals in the human hair. Pd and Cd concentrations in soils and food crops showed elevated levels above the WHO recommended limits. Pb, Cd, Cr, Cu, and Zn concentrations were significantly higher (p < 0.05) in male scalp hair samples collected from polluted area as compared to control area. In conclusion, consumers in the study area are exposed to high health risks associated with bioaccumulation of heavy metals through ingestion of heavy metals resulting from contamination of food crops grown in the study area and should be sensitized on the dangers of heavy metals on their health Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4164 Files in this item: 1
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Opiyo, Monica Naomi; Kenyon, Christopher; Manwani, Kajal; Seckl, Jonathan; Andrew, Ruth; Chapman, Karen (Endocrine Abstracts, 34, 2014)[more][less]
Abstract: Background and aims: Bile acids are conserved through enterohepatic circulation, a glucocorticoid-modulated process. 11β-Hydroxysteroid dehydrogenase type-1 (11β-HSD1) converts cortisone/11-dehydrocortisone to cortisol/corticosterone, thus increasing intracellular glucocorticoid levels. 11β-HSD1 also metabolises 7-oxo-lithocholic acid, a bile acid. 11β-HSD1 is highly expressed in the liver and may alter bile acid transport through regeneration of active glucocorticoids or may directly metabolise bile acids, thus altering profile. We compared bile acid synthesis, release, their enterohepatic circulation and profile in Hsd11b1−/− and isogenic C57Bl/6 control mice. Methods: Adult male, chow-fed mice (eight per group) were fasted for 4 h or fasted for 4 h then re-fed 4 h. Serum, and liver and gall-bladder bile acid concentrations and profiles were measured by spectrophotometry/gas chromatography–mass spectrometry. Results: Fasted Hsd11b1−/− and C57Bl/6 mice had similar volumes of bile (3.2 vs 5.0 l). 7β-Hydroxylated acids (ω-muricholic>β-muricholic>ursodeoxycholic acid>others) predominated in bile of C57Bl/6 mice while 7α-hydroxylated acids (cholic>α-muricholic>chenodeoxycholic acid>others) predominated in Hsd11b1−/− mice; the ratio of 7α:7β acids was >100 greater in Hsd11b1−/−mice. In fasted Hsd11b1− mice, bile acid concentrations were higher in serum (Hsd11b1−/−: 30±9 vs C57Bl/6: 3.8±1.3 nM, P<0.0001) and liver (Hsd11b1−/−: 243±18 vs C57Bl/6: 139±19 nmol/g, P<0.001). Re-feeding caused gall bladder emptying in C57Bl/6 mice (49.6±8% of fasted weight, P<0.0001) and increased serum (62.5±7.6 nM) and liver (497±20 nmol/g) bile acid concentrations, while in Hsd11b1− mice, the gall bladder did not empty (92±7.8% fasted weight) and serum (24±12 nM) and liver (122±21 nmol/g) bile acid concentrations were similar to the fasted state. Conclusion: Bile acid release and the pattern of synthesis is controlled by 11β-HSD1 activity in mice. This may affect digestion and, depending on functional differences of 7α- and 7β- hydroxylated bile acids, may have significant effects on lipid and sterol metabolism and bile acid-mediated transcription. Description: Abstract URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3960 Files in this item: 1
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Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic ApplicationNguu, John Njagi; Aduda, Bernard Odhiambo; Nyongesa, Francis Wanjala; Musembi, Robinson Juma (Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic Application. Journal of Energy and Power Engineering 8 (2014) 757-764, April , 2014)[more][less]
Abstract: Nano sized powders of TiO2 (titanium dioxide) and Nb2O5 (Niobium (V) oxide) were used to fabricate TiO2/Nb2O5 composites thin films by EPD (electrophoretic deposition) technique. The metal oxide powders, together with magnesium nitrate hexahydrate pellets, were suspended in propan-2-ol inside an EPD cell. The electrodes, placed 1.2 cm apart, were partially immersed in the suspension and a DC potential applied across them. Key EPD process parameters, which include applied DC electric field, deposition time and solid concentration in suspension, were optimized through visual inspection and from UV-Vis-NIR spectrophotometer spectra. The highest (55%) transmittance was obtained for films with deposition time of 90 s, powder concentration of 0.01 g/40 mL, and 35 V DC (direct current) voltage. XRD micrographs confirmed that TiO2 and Nb2O5 particles were presented in the composite film. SEM (scanning electron microscope) micrographs of the composite electrode thin films showed that porous films of high quality with well controlled morphology were deposited by using the EPD technique. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3958 Files in this item: 1
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Kinuthia, Geoffrey K.; Kabiru, Ephantus W.; Gikonyo, NK; Ingonga, JM; Kigondu, EM; Anjili, CO (Health Sciences, April , 2014)[more][less]
Abstract: Leishmania major is a protozoan parasite that causes cutaneous leishmaniasis and the standard drugs are expensive and toxic. Cheaper and safer natural drugs are therefore needed. In this study, the in vitro efficacy of crude extracts of Callistemon citrinus were tested against L. major. Controls were anti leishmanial drugs pentostam and liposomal amphotericin B. The minimum inhibitory concentrations of C. citrinus crude aqueous and methanolic extracts were 5mg/ml and 1mg/ml respectively compared to 12.5µg/ml and 6.25µg/ml for pentostam and liposomal amphotericin B respectively. The IC 50 for C. citrinus extracts against promastigotes ranged from 297.75 to 572.69µg/ml compared to 0.26 and 0.82µg/ml for pentostam and liposomal amphotericin B. The IC 50 for C. citrinus extracts against vero cells ranged from 467µg/ml to 1314.65µg/ml. The promastigotes' viability after treatment with aqueous and methanolic extracts was 69.58% and 75.74% respectively. At 125µg/ml, the aqueous and methanolic C. citrinus extracts had in vitro amastigotes' infection rates (IRs) of 77.0±2.50 % and 77.5±3.50% respectively. The multiplication indices (MIs) and IRs of amastigotes treated with C. citrinus crude aqueous extracts and those treated with crude methanolic extracts differed insignificantly (P > 0.05). C. citrinus methanolic extracts stimulated production of about 20µM nitric oxide in BALB/c mice peritoneal macrophages suggesting immuno-modulatory role of the extracts. The crude aqueous and methanolic extracts of C. citrinus were therefore concluded to be relatively less toxic and possessed in vitro anti-leishmanial activity against L. major promastigotes and amastigotes. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4163 Files in this item: 1
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Murimi, Mary; Chrisman, Matthew S.; McAllister, Tiffany; McDonald, Olevia D. (Health Education & Behavior, 2015)
[more][less]Abstract: Approximately 8.3% of the U.S. population (25.8 million people) is affected by type 2 diabetes. The burden of diabetes is disproportionately greater in the African American community. Compared with non-Hispanic Caucasian adults, the risk of diagnosed type 2 diabetes was 77% higher among non-Hispanic Blacks, who are 27% more likely to die of diabetes complications than either Caucasians or Hispanics. The purpose of this longitudinal community intervention was to promote healthy lifestyles among African American participants through multiple channels, including individualized point-of-testing counseling, and weekly exercise and nutrition classes led by trained community health mentors. Data collection procedures were guided by the World Health Organization’s STEPS approach, which includes gathering demographic and health information, collecting anthropometric measurements, and analyzing biochemical blood work. Changes in body mass index were assessed from in-person measurements and changes in blood lipids and glucose were examined by biochemical analyses. A total of 157 individuals participated in this study. Results showed that weight gain during the intervention was prevented, glucose levels decreased (−10.88 mg/dL), and low-density lipoprotein cholesterol decreased (−8.8 mg/dL), while high-density lipoprotein increased (+3.2 mg/dL). Lifestyle interventions and point-of-testing counseling can be successful in reducing risk factors for type 2 diabetes among the African American population. The results of this intervention indicate that the use of community health mentors and point-of-testing counseling may be effective in fostering healthy lifestyle changes, which can halt the progression of type 2 diabetes among non-Hispanic Black populations. URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/2981 Files in this item: 1
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Ngure, Veronica; Sitati, Noah; Shisia, Silvanus; Kinuthia, Geoffrey (Journal of Natural Sciences Research, January , 2015)[more][less]
Abstract: Elevated levels of metals due to anthropogenic activities are a cause of environmental concern because of their effects on human health. Eldoret Municipality, in Kenya, is one of the fastest growing municipalities with both industrial and agricultural developments. The study aimed at determining the concentration of five elements namely zinc (Zn), lead (Pd), copper (Cu), chromium (Cr) and cadmium (Cd) in five sample sites within the municipality and established the possible health risks in the residents. Measured concentrations of Zn, Pb, Cr, Cu and Cd in surface horizon soils were used to estimate the geochemical load indices and their spatial distribution. Four soil samples were collected monthly from each sample site on the same farms totaling 200 soil samples. The samples were dried, ground and sieved for metal digestion using varied acids in the laboratory and analysis was done against metal standards using Atomic Absorption Spectrometry (AAS). Only Cd concentration (0.0286mg/kg) in all sites was above the recommended unpolluted soils. Epidemiological data were obtained from the residents and hospitals to establish associated health risks. Determination of metals’ combined effects using multivariate Principal Component Analysis showed that varying concentrations of Zn and Pb tended to increase incidences of cancer, hypertension and stroke. Metals Zn, Pb and Cu concentrations correlated with development of cardiovascular diseases. Awareness rising to residents of Eldoret Municipality on high Cd concentration in the soil and use of alternative forms of fertilizers and related chemicals with low Cd content is recommended. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3977 Files in this item: 1
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Wamalwa, Emmanuel; Neyole, Edward; Poipoi, Moses; Ringera, William; Otomu, Geoffrey; Bitok, Monicah; Mbaluka, Rosemary (Open AIDS, November 13, 2015)[more][less]
Abstract: The male condom remains the single, most efficient and available technology to reduce sexual transmission of HIV as well as sexually transmitted infections. This study sought to establish condom use determinants and practices among people living with HIV (PLHIVs) in Kisii County, Kenya. We interviewed 340 PLHIVs and 6 health workers. Although most PLHIVs had correct knowledge and approved condoms as effective for HIV prevention, consistent use and condom use at last sex were notably low especially among PLHIVs aged 18 – 24, those who depended on remittances from kin as main source of income, as well as during sex with secondary and casual partners. This study notes that knowledge on various benefits of using condoms is associated with enhanced condom use practices. Non-disclosure of HIV status to secondary and casual partners remains a key barrier to condom use among PLHIVs Our observations highlight the need to further promote condom use among specific PLHIVs socio-demographic groups who continue to exhibit low condom use rates. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4174 Files in this item: 1
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Ngure, Peter; Kasili, S; Anjili, CO; Karanja, RM; Kaburi, J; Mwangi, M; Kinuthia, Geoffrey; Kiarie, Martha; Nzau, A; Kepha, S; Maniania, NK; Ndegwa, PN; Irungu, L; Ngumbi, MP (Health Sciences, December , 2015)[more][less]
Abstract: Leishmaniasis is one of the neglected tropical diseases that pose a threat to people in the endemic regions. In Africa, transmission is through the bite of an infected female phlebotomine sand fly. Disease control with chemotherapy is logistically difficult, toxic and expensive. Entomopathogenic fungi (EPF) hold great potential as alternative agent for the control of sandflies as demonstrated by their efficacy in recent laboratory experiments. The impressive results have merited testing of the effect of EPF on sand fly populations in their natural habitats. The aim of this study was to test the effect of EPF on sand fly populations on a small scale in a leishmania-endemic area in Kenya. Entomopathogenic fungi isolates were cultured on sabourand dextrose agar (SDA) in petri dishes and incubated at 22-280C. Conidia were produced on long white rice substrate and harvested by sifting the substrate through a 295 μm mesh size sieve and stored at 4-6 0C before being used in the experiments. Metarhizium anisopliae isolates were selected for use in the field after showing 76.8 and 100% mortality in laboratory bred target insects. 2.0 x 1014 of dry conidia of the fungus were introduced into ten termite mounds through the shafts using a modified foot pump in Rabai, Marigat area of Baringo County, Kenya. The site harbours both Phlebotomus martini and P. duboscqi leishmaniasis vectors. Sand fly densities, mycoses and survival after capture from the mounds were observed from week one post-treatment to week thirteen. Results indicate that the fungi in termite mounds caused three to ten-fold mortalities in the population of sand flies nine weeks after application. Longevity of sand flies collected from treated termite mounds was reduced to less than nine days after collection, whereas 90% of those from control mounds lived well over the nine days. Sand flies collected from the treated termite mounds during week nine had 100% mortality compared to 10.7% of those from the control mounds. Metarhizium anisopliae infection was observed in 42% of the sand fly cadavers collected from the treated termite mounds and 0% in the control group. From the findings of this study sand flies have shown to be susceptible to Metarhizium anipilae and can be controlled by the same. Further studies to determine the best methods for delivery and application in the diverse ecological settings of various leishmaniasis vectors are recommended. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4162 Files in this item: 1
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Murimi, Mary W.; Mupfudze, T; Mbogori, Teresia N.; Amin, M R (Journal of Nutrition Education and Behavior, 2016)[more][less]
Abstract: Abstract Objective To determine the prevalence of food insecurity and the coping strategies and to investigate the role of safety nets among low-income households in urban and rural west Texas. Design The Core Food Security Module, an 18-item scale, was used in a cross-sectional purposeful convenience sample comparing rural and urban households, whereas the demographic survey assessed participation in food assistance/safety net programs. Setting Rural and urban neighborhoods in west Texas. Participants Sample size of 191 participants from low-income households, predominantly African American and Hispanic people. Main Outcomes Measures Levels of food insecurity and use of safety nets. Analyses Comparisons between rural and urban households and between food-secure and food-insecure households were analyzed using the chi-square test of independence for categorical variables. Fisher's exact test was used whenever the number in each cell was < 5 in 2 × 2 contingency tables. Results Prevalence of household and child food insecurity in west Texas was 63% and 43%, respectively. Forgoing balanced meals was a common coping strategy. There was high intake of affordable energy-intense foods. Conclusions and Implications The high prevalence of food insecurity in low-income households in west Texas led to high intake of energy-intense food with low nutrients, resulting in higher prevalence of anemia, obesity, and other chronic diseases. There was low participation in safety net programs. Educational interventions on food choices are recommended. URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/2979 Files in this item: 1
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Kiarie, Martha; Nzau, Anastasia; Ngumbi, Philip; Waithima, Abraham K.; Bowen, Michael; Nzunza, Rosemary; Ingonga, Johnstone; Ngure, Peter (International Journal of Tropical Medicine and Public Health, 2016)[more][less]
Abstract: Objective: To establish the level of knowledge, attitude, practices and beliefs related to kala azar among residents of Marigat sub - County, Baringo County. Methods: The sub-County is divided into 37 sub-locations and of these 8 herein referred to as villages were considered for this study. A total of 670 households were randomly drawn from the 8 villages, and this formed the sample population. Data were collected using structured questionnaires and in-depth interviews of key informants. Results: The findings indicated that the respondents were well informed on kala azar; the cause and treatment. They also had favorable attitude toward the disease. They were aware that the disease was curable and sought treatment from health facilities as opposed to traditional alternatives. In seeking treatment, the residents were faced with challenges such as the long distance to health facilities, long period of treatment and the attendant cost of caring for a leishmaniasis patient. The respondents were aware that the disease was spread by an insect; however, they were not aware of preventive measures. Most live in destitute houses which predisposed them to the infective bite of the vector. Most of the respondents are not employed and the cost of treatment, in addition to attendant costs places a heavy economic burden on them. Conclusion: The results showed good awareness of leishmaniasis, positive attitude and practices among the respondents which are important attributes in community participation. These findings are quite encouraging to researchers planning control programs because such a community would be more receptive to suggested control measures. Description: Published Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3543 Files in this item: 1
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Ntwiga, Davis Bundi; Weke, Patrick; Kirumbu, Michael Kiura (Interdisciplinary Description of Complex Systems, March 18, 2016)[more][less]
Abstract: For effective interactions to take place in a social network, trust is important. We model trust of agents using the peer to peer reputation ratings in the network that forms a real valued matrix. Singular value decomposition discounts the reputation ratings to estimate the trust levels as trust is the subjective probability of future expectations based on current reputation ratings. Reputation and trust are closely related and singular value decomposition can estimate trust using the real valued matrix of the reputation ratings of the agents in the network. Singular value decomposition is an ideal technique in error elimination when estimating trust from reputation ratings. Reputation estimation of trust is optimal at the discounting of 20 %. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/3956 Files in this item: 1
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Wegs, C; Creanga, AA; Galavotti, C; Wamalwa, E (Plos One, April 28, 2016)[more][less]
Abstract: Use of family planning (FP) is powerfully shaped by social and gender norms, including the perceived acceptability of FP and gender roles that limit women’s autonomy and restrict communication and decision-making between men and women. This study evaluated an intervention that catalyzed ongoing community dialogues about gender and FP in Siaya county, Nyanza Province, Kenya. Specifically, we explored the changes in perceived acceptability of FP, gender norms and use of FP. Description: Journal Article URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/4172 Files in this item: 1
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Ntwiga, Davis Bundi; Weke, Patrick; Kirumbu, Michael Kiura (Interdisciplinary Description of Complex Systems, June 1, 2016)
[more][less]Abstract: For effective interactions to take place in a social network, trust is important. We model trust of agents using the peer to peer reputation ratings in the network that forms a real valued matrix. Singular value decomposition discounts the reputation ratings to estimate the trust levels as trust is the subjective probability of future expectations based on current reputation ratings. Reputation and trust are closely related and singular value decomposition can estimate trust using the real valued matrix of the reputation ratings of the agents in the network. Singular value decomposition is an ideal technique in error elimination when estimating trust from reputation ratings. Reputation estimation of trust is optimal at the discounting of 20 %. URI: http://repository.daystar.ac.ke/xmlui/handle/123456789/2964 Files in this item: 1
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