Past Issue

The production and consumption of cassava and its derivatives is part of the productive and food culture of the traditional populations of the Brazilian Amazon and, particularly, in the State of Pará. Cassava cultivation is widely disseminated throughout state; and, Acará municipality is an important producer, standing out in the cassava flour production and commercialization. The article’s objective was to evaluate socioeconomic and technological characteristics of cassava production and to identify cultivation practices in the Paraíso quilombola community, Acarámunicipality, Pará state.

The electric power sector restructuring associated with the technological developments in the scope of automation, information and data analysis has led the agents involved to search solutions that contribute to the asset operation, maintenance and planning. In this sense, the present work, resulting of ANEEL R&D project PD-07469-0002 / 2018, proposed the development of an Expert System (ES) for the maintenance management of a hydraulic power plant, considering reliability analysis and financial impact models.

The teaching posture is a significant variable in the processes developed in a didactic session, being contemplated as an object of studies in a teaching methodology born at the Federal University of Ceará and which presents solutions to problems related to the way knowledge is formed by the student from of the teacher's actions. In this article, as part of the results of the thesis work, we discuss the origin and theoretical development of this scientific method applied to the classroom and it's influence and transformation in the production of knowledge for the teacher's work.

World tobacco production has stagnated periodically, ranging from 6 to 6.5 million tonnes in the last five years. The Balkan countries, including Macedonia, along with Greece, Bulgaria and Turkey, are the largest producers and exporters of quality oriental tobacco in the region. Tobacco production in the EU is based on certain EU regulations conceptualized as the Common Agricultural Policy (CAP). From 2007 to today, there have been major changes in EU policy on tobacco production, leading to a sharp decline in production in all member states, and especially in neighboring Greece.

Installation of ground wires is the basic method for protection of an OHL against lightning. Back-flashovers are the most frequent kind of trip outs in the case when an OHL is equipped with ground wires. At medium voltage OHL with high tower footing impedance almost every lightning strike to the line causes a trip out. The secondary effect of the lightning stroke became the major concern due to strong magnetic field around the downward conductor connecting the lightning rod to the grounding system.

Mortality and exploitation of Oreochromis andersonii, Oreochromis macrochir and Oreochromis niloticus of the Kafue Floodplain fishery were investigated between September, 2015 and November, 2015.This study was aimed at investigating the mortality and exploitation of mouth brooding tilapiines of the Kafue Floodplain fishery. Three stations that represent the major ecological habitats of the Kafue Floodplain fishery were selected. These were: Kafue Road Bridge (swamp), Namalyo (lagoon) and Kakuzu (riverine).

Given the growing ethical questioning regarding the use of animal testing in the analysis of toxicity research and in vitro assay validation is a viable alternative to animal replacement. In this sense, this study evaluated the hemolytic activity of four essential oils extracted from Syzygiumjambolanum, Lippiagracilis, Myracrodruonurundeuva and Bixaorellanaplants, by applying the red blood cell hemolytic assay, since it is a simple technique, low cost, and effective to screening natural extracts cytotoxicity.

Learning to manage rain water means succeeding in mastering not only water scarcity but also excess and supplying water for agriculture, hygiene thus maintaining the quality of environment and improving socio-economic conditions. However, even if Kagarama sector located in Kicukiro districts in Rwanda has two rainfall seasons which serves as the ample water resources. Kagarama sector is still affected by low per capita water availability in summer days and water excess in rain season both leading to problems related to socio-economic activities and environment.

Metformin is a drug widely used in worldwide for type 2 diabetes mellitus treatment. The aim of this study was to compare the dissolution profiles of Metforminhydrocloride tablets (850 mg) available as the reference drug (R), generic (G) and similar (S) commercialized in Bahia, Brazil using a simple, fast and low cost ultraviolet spectrophotometric method. The tests were performed in compliance with the Brazilian Pharmacopoeia and United States Pharmacopeias. The proposed methodology for quantifying the drug was validated presenting precision, linearity and accuracy.

Objective: Abortion in a dairy herd is a factor that impact the company’s productivity. It is important to provide epidemiological surveillance tools that help anticipate herd reproductive losses in order to correct those through management measures, infectious disease control and proper nutritional management. The analysis of biochemical profiles as a preventive medicine tool is useful to detect metabolic imbalances that can be part of the causality of non-infectious abortions.