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314 results for “evolution”
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Research ArticleOpen accessEvery word in the titleEvolution of Microbial Biomasses C and N during the Composting of Municipal solid WastesOlfa Fourti, Naceur Jedidi, Abdennaceur HassenProblem statement: The aim of this study was mainly focused on the evolution of microbial biomasses C and N during the composting of municipal solid wastes. Approach: The carbon and the nitrogen of the microbial biomass (BC and BN) were studied using the fumigation-extraction method. Results: The dynamics of the BC/BN ratio, index of the chemical composition of the whole … …American Journal of Environmental Sciences, Vol. 7, Issue 1 · 28 Feb 2011 · 6,702 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleComplexity in Human Perception of Brightness: A Historical Review on the Evolution of the Philosophy of Visual PerceptionKuntal Ghosh, Kamales BhaumikProblem statement: The “eye-brain” complex, which contributes maximally to visual perception, is no doubt a very interesting object for complexity study. In this review we shall try to present some of its aspects in perceiving brightness. It is a well-known fact that the perceived brightness of any surface depends on the brightness of the surfaces that surround it, a phenomenon … …OnLine Journal of Biological Sciences, Vol. 10, Issue 1 · 30 Jun 2010 · 8,680 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleGenomic Distance between Thymidylate Synthase and Dihydrofolate Reductase Genes Does Not Correlate With Phylogenetic Evolution in BacteriaVitor Hugo MoreauProblem statement: Dihydrofolate Reductase (DHFR) and Thymidylate Synthase (TS) exist as bifunctional enzymes coded into unique polypeptide chain in protozoans. Bifunctional DHFR-TS is associated with an increase in the enzymatic activity by channeling the substrate between the active sites. In some bacteria, DHFR and TS genes are neighbors in the genome, whereas in others, they are located millions of base … …American Journal of Biochemistry and Biotechnology, Vol. 6, Issue 1 · 31 Mar 2010 · 8,188 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleDiscovery of Evolutionary Divergence of Biological Nitrogen Fixation and Photosynthesis: Fine Tuning of Biogenesis of the NifH and the ChlL by a Peptidyl-Prolyl Cis/Trans IsomeraseNara Gavini, Sinny Delacroix, Kelvin Harris Jr., Lakshmi PulakatProblem statement: Despite the structural and functional similarities between the nitrogenase that performs biological nitrogen fixation reaction and the Dark Protochlorphyllide Oxidoreductase (DPOR) that performs chlorophyll-biosynthesis, attempts to substitute nitrogenase-components with DPOR-components have hitherto failed. This investigation was undertaken to test if Chlamydomonas reinhardtii protochlorophyllide (Pchlide) reductase (ChlL) that shares some structural similarity with Nitrogenase Reductase (NifH) could complement the … …American Journal of Biochemistry and Biotechnology, Vol. 7, Issue 4 · 17 Feb 2012 · 7,614 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEvolution of a Graduate Environmental Science ProgramWill Focht, Talya HendersonProblem statement: Environmental science programs vary widely in their curricula and pedagogical approaches. In part, this is due to the lack of a unified agreement on field identity. However, program differences are also the product of variable program histories. Approach: This essay described the founding and subsequent history of the Environmental Science Graduate Program at Oklahoma State University, its oldest … …American Journal of Environmental Sciences, Vol. 5, Issue 2 · 30 Apr 2009 · 7,010 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleSolving Multi-Objective Master Production Scheduling Model of Kalak Refinery System Using Hybrid Evolutionary Imperialist Competitive AlgorithmShereen Saleem Sadiq, Adnan Mohsin Abdulazeez, Habibollah HaronThe improvement of operational planning in the field of oil refinery management is becoming increasingly essential and valid. The influential primary factor, among others, is the ever-changing economic climate. The industry must continually assess the potential impacts of variations in the final product demand, price fluctuations, crude oil compositions and even seek out immediate opportunities within the market. The Master … …Journal of Computer Science, Vol. 16, Issue 2 · 12 Feb 2020 · 7,827 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleWEEDS IDENTIFICATION USING EVOLUTIONARY ARTIFICIAL INTELLIGENCE ALGORITHMAhmed M. Tobal, Sahar A. MokhtarIn a world reached a population of six billion humans increasingly demand it for food, feed with a water shortage and the decline of agricultural land and the deterioration of the climate needs 1.5 billion hectares of agricultural land and in case of failure to combat pests needs about 4 billion hectares. Weeds represent 34% of the whole pests while … …Journal of Computer Science, Vol. 10, Issue 8 · 4 Mar 2014 · 7,823 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleAn Evolution Framework for Evaluating Intelligent Spectrum Sensing Mechanisms in Cognitive RadioArchana Krishnamuthy, Sudhindra Kumbhashi RajgopalCognitive radio technology has advanced to address the challenge of limited spectrum availability by employing spectrum sensing techniques. This process is framed as a detection problem involving two core hypotheses: Hypo-0 and Hypo-1. Hypo-0 represents the scenario where only noise is present, and its modeling depends on parameters such as the number of observed samples, the timing of signal acquisition, … …Journal of Computer Science, Vol. 21, Issue 8 · 4 Sep 2025 · 5,807 accessesView PDFCite
Review ArticleOpen accessEvery word in the titleThe Digital (R)evolution of Insurance Business ModelsAntonella CappielloThe paper focuses on the digital transformation that is greatly affecting the insurance industry and forcing radical change upon corporate culture, products and processes, customer relationship and relations with the sector’s various competitors. By responding to three research questions, the paper aims to contribute to the academic discussion and proposes to offer useful cues of reflection to the insurance management, … …American Journal of Economics and Business Administration, Vol. 12, Issue 1 · 1 Jan 2020 · 16,342 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleGraphics Pipeline Evolution: Problems and SolutionsGhazi Shakah, Mutasem Alkhasawneh, Victor Krasnoproshin, Dzmitry MazoukaReal-time computer graphics technologies such as graphics engines and graphics pipeline (software and hardware components) have improved considerably in the past decade. However, increase in efficiency and broadening of the applicability area has come at the cost of complexity of the tools. Therefore, development costs of advanced visualization systems can increase considerably. In this research we explore the possibility of … …Journal of Computer Science, Vol. 15, Issue 7 · 2 Jul 2019 · 8,268 accessesView PDFCite