Ethiopian Journal of Science and Technology <p>The <em>Ethiopian Journal of Science and Technology</em> (EJST) publishes high quality original&nbsp;&nbsp; research articles, reviews, short communications, and feature articles on basic and applied aspects of science, technology, agriculture, health and other related fields.</p> <p>Other websites associated with this journal:&nbsp;<a title="" href="" target="_blank" rel="noopener"></a></p> College of Science , Bahir Dar University en-US Ethiopian Journal of Science and Technology 1816-3378 <p>The copyright belongs to the journal.</p><p>The articles in Ethiopian Journal of Science and Technology are Open Access distributed under the terms of the Creative Commons Attribution License (<a title="The articles in Ethiopian Journal of Science and Technology are Open Access distributed under the terms of the Creative Commons Attribution License ( BY4.0)." href="/index.php/ejst/manager/setup/The%20articles%20in%20Ethiopian%20Journal%20of%20Science%20and%20Technology%20are%20Open%20Access%20distributed%20under%20the%20terms%20of%20the%20Creative%20Commons%20Attribution%20License%20(http:/" target="_blank"></a>).</p> Differential pulse stripping voltammetric determination of paracetamol in pharmaceutical tablet samples using murexide modified carbon paste electrode <p>As an acetyl aniline drug, paracetamol (PA) has antipyretic and analgesic functions, which is suitable for the remedy of fever, headache and joint ache. The murexide modified carbon paste electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy and compared with bare carbon paste electrode. In this study, murexide-carbon paste electrode (MXCPE) was described for the differential pulse stripping voltammetric determination of paracetamol in pharmaceutical tablet sample. The MXCPE exhibited a better electrocatalytical behavior for the oxidation of PA as evidenced by nearly two folds of current enhancement and a shift of the onset potential by 65 mV in comparison with a bare carbon paste electrode. Differential pulse stripping voltammetry peak currents of PA increased linearly with their concentrations in the ranges of 5-1000 mM with a detection limit of 0.09 mM (S/N = 3). The determination of the analyte in pharmaceutical samples was found in the range 97.6-106.0% of the theoretical values and a recovery result between 94.6 and 96.8% was obtained. For selective determination of PA in the presence of AA was successfully performed.</p> Yonas Beyene Yohannes Mohammed Hajole Erba Copyright (c) 2021-10-08 2021-10-08 14 3 191 206 10.4314/ejst.v14i3.1 Weak LI-ideals in implicative almost distributive lattices <p>In the field of many valued logic, lattice valued logic (especially ideals) plays an important role. Nowadays, lattice valued logic is becoming a research area. Researchers introduced weak LI-ideals of lattice implication algebra. Furthermore, other scholars researched LI-ideals of implicative almost distributive lattice. Therefore, the target of this paper was to investigate new development on the extension of LI-ideal theories and properties in implicative almost distributive lattice. So, in this paper, the notion of weak LI-ideals and maximal weak LI- ideals of implicative almost distributive lattice are defined. The properties of weak LI- ideals in implicative almost distributive lattice are studied and several characterizations of weak LI-ideals are given. Relationship between weak LI-ideals and weak filters are explored. Hence, the extension properties of weak LI-ideal of lattice implication algebra to that of weak LI-ideal of implicative almost distributive lattice were shown.</p> Tilahun Mekonnen Munie Copyright (c) 2021-10-08 2021-10-08 14 3 207 217 10.4314/ejst.v14i3.2 Morphometric characteristics of four important fish species from the Rwandan side of Lake Kivu <p>Inland fisheries are important socio-economic resources for rural communities in Africa. In Rwanda, about two million people directly depend on capture fisheries from Lake Kivu. Sustainable fisheries management requires monitoring of population dynamics that help devise effective intervention strategies. However, the relevant data such as length-length and length-weight relationships do not exist for most of the key species in Lake Kivu. The present study generated morphometric and body weight data for <em>Limnothrissa miodon </em>(n=82),<em> Lamprichthys tanganicanus </em>(n=55),<em> Haplochromis vittatus </em>(n=51) and<em> Haplochromis graueri </em>(n=34) from Lake Kivu. Length-weight relationships (W=aL<sup>b</sup>) were highly significant for all species (p &lt; 0.0001), high adjusted R<sup>2</sup> = 78 to 98% of the variance in weight explained by total length. Negative allometric length-weight relationships were found with regression slope (b) values of 2.7 for <em>Limnothrissa miodon,</em> 2.8 for <em>H. graueri</em>, and 2.8 for <em>L. tanganicanus</em>, and positive (b=3.4) for <em>Haplochromis vittatus</em>. Length-length relationships were highly significant for all species (p ≤ 0.0001), except for the relationship between total and caudal length for <em>L. miodon</em>, and total and caudal peduncle length for <em>L. tanganicanus</em>, both not significant at p &gt; 0.05. The highest R<sup>2 </sup>was for the relationships between total and standard length for <em>H. vittatus,</em> and total and fork length for <em>L. tanganicanus</em>. No description of length-length relationships exists for these species in literature or in FishBase database. The data generated in the current study will be used to assess changes in fish populations over time.</p> Antoine Nsabimana Wellars Banzi Valens Habimana Colores Uwamariya Dieudonne Mutangana Copyright (c) 2021-10-08 2021-10-08 14 3 219 228 10.4314/ejst.v14i3.3 Green synthesis of silver nanoparticles by aqueous extract of Dovyalis abyssinica fruit for antibacterial applications <p>Green biosynthesis technique was employed to synthesize silver nanoparticles (AgNPs). Fresh citrus fruit of<em> Dovyalis abyssinica</em>&nbsp;(vernacular name Koshim) tree was extracted by distilled water to obtain phenolic natural compounds that have reducing capacity of metallic ions to the corresponding metallic nanoparticles, in this case, silver ion to silver nanoparticles. The appearance of the UV-Vis absorbance peak at 430 nm and the color change from pale yellow reaction mixture to reddish brown colored product solution have confirmed the formation of AgNPs. FTIR data has also shown the presence of organic components from the plant with the particles that may be used as capping agents to stabilize the formed particles and to control the size. The prepared nanoparticles and the plant extract have shown antibacterial property against <em>E. coli</em>&nbsp;and&nbsp;<em>S. aureus</em><em>, though </em>the effect of the AgNPs was better than the plant extract. This study contributes for the development of environmentally friendly procedures in the preparation of nanoparticles for medicine, energy or environment.</p> Mekuriaw Assefa Kebede Baye Sitotaw Kidanemariam Teklay Hilawea Copyright (c) 2021-10-08 2021-10-08 14 3 229 237 10.4314/ejst.v14i3.4 GIS-based approach for morphometric characteristics and development of hydrographs for the upper watershed of Jebba Reservoir, Nigeria <p>Nigeria's Jebba sub-basins are synonymous to frequent flooding, high rate of erosion, depletion of soil nutrients and unsustainable water use. The uncontrolled flooding may be a result of numerous factors related to topography, geology, climate and human activity. &nbsp;The present work was an attempt to describe the application of Geographical Information System (GIS) and Digital Elevation Model (DEM) for the estimation of morphometric characteristics of eight sub-basins in the upstream watershed of Jebba reservoir, Nigeria. Morphometric characteristics such as topographic, areal, relief and network were determined. Soil Conservation Service (SCS) technique was applied to estimate hydrographs. The study revealed that sub-basin number 3 had the lowest time of concentration and maximum depth of runoff while sub-basin number 2 had maximum ratio of circulation of 1.8 and it is tagged as the area that is highly prone to flood. The peak runoff in the sub-basins ranged between 330.10 and 924.86 m<sup>3</sup>/s (25-year return period) and for 100-year intervals ranged between 502.69 to 1408.40 m<sup>3</sup>/s. The estimated peak runoffs can be adopted for designing and constructing erosion control structures in the catchment area.</p> A.G. Adeogun A.A. Mohammed H.O. Ganiyu A.W. Salami Copyright (c) 2021-10-08 2021-10-08 14 3 239 257 10.4314/ejst.v14i3.5