Study of the potentiality of murumuru husk ash, an amazonian agroindustrial waste, as a filler to structural concrete

Abstract This research paper focuses on the use of murumuru husk ash (MHA), an agro-industrial waste generated specifically in the Amazon region, as partial replacement of cement in structural concrete. It also evaluates the physical, chemical and mineralogical characteristics of the ash to act as filler in concrete and its properties in the fresh and hardened states in concrete. To this end, the MHA performed physical-mechanical characterization tests, such as specific mass, pozzolanic activity with Portland cement, pozzolanic activity with lime, and BET test, also performing the mineralogical and chemical analysis of the ash. The results showed that there is technical feasibility with partial replacement of 6% of MHA in cement using plasticizer additive to improve workability, thus showing an improvement in the physical-mechanical and durability properties of the concrete

Análise por HPLC e Espectrometria de Massas do Extrato Alcaloídico Hexânico das Folhas de Annona muricata/ HPLC and Mass Spectrometry analysis of Hexane Extract Alkaloidal from the Leaves of Annona muricata

Annona muricata, uma planta frutífera da região amazônica, muito apreciada pelo seu fruto, a graviola, comum na região Amazônica e bastante estudada devido aos seus componentes químicos, alcalóides e acetogeninas. Com base nessas informações, neste trabalho relata-se a análise via HPLC e Espectrometria de massas do extrato alcaloídico obtido a partir do extrato hexânico das folhas, via partição ácido/ base

Modeling and simulation of a Radio Frequency Identification (RFID) Tag for Hospital Applications

Electromagnetism and all the principles associated with it have been studied extensively due, above all, to their applicability in several new technologies, including Radio Frequency Identification (RFID). This system, composed of a tag, a reader, and software, aimed at information processing, operates through wireless communication, thanks to the interaction between radio waves, more specifically, their transmission and reception. This technology becomes even more remarkable, from the integration of Artificial Intelligence, in directing the collected data, to AI algorithms, responsible for recognizing patterns, anticipating demands and improving processes. In this article, RFID technology is directed towards the hospital setting, building upon an in-depth theoretical study of improvement possibilities by integrating such systems into medical and hospital services. Furthermore, based on the modelling of an RFID tag with a chip, modifications are made to the original structure, with the insertion of resonator rings, resulting in miniaturization of the initial project, as well as redundancy in the reading process, results that were analysed in the software © CST Microwave Studio, given continuous computer simulations

Modelos moleculares confeccionados em papel para estudo do conteúdo de estereoquímica / Molecular models made on paper to study of the stereochemistry

O estudo de estereoquímica tem grande dificuldade entre os alunos, principalmente pelo fato de ser abstrato, decorativo e fora de contexto, quando o aluno participa da aula confeccionando o seu próprio material didático com certeza haverá um melhor entendimento, com base nessa premissa, desenvolveu-se um modelo molecular confeccionado em papel e recortado com tesoura, para o entendimento do conteúdo de estereoquímica, tais como quiralidade, plano de simetria, enantiômero, diastereoisômero, meso-isômero, entre outros

Aproveitamento das folhas de Annona mucosa / Utilization of leaves Annona mucosa

O biribazeiro (Annona mucosa) é uma planta frutífera da região amazônica, apreciada pelo seu fruto, o biribá, sendo bastante estudada devido aos seus componentes químicos. Neste trabalho, as folhas foram submetidas a extração hexanica, para a obtenção do extrato hexanico alcaloídico, visando a sua caracterização via CLAE e Espectrometria de massas, dando como resultado a presença do alcaloide do tipo aporfínico, anonaina

PHYSICAL ACTIVITY LEVEL DOES NOT INFLUENCE THE NEUROMUSCULAR FATIGUE IN ADULTS

Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenomenon associated with central changes and adaptations of the neuromuscular system. Objective: The purpose of this study was to evaluate the fatigue induced by intermittent successive extension of the knee between active and inactive university students. Method: Twenty healthy men (≥18 years), voluntarily participated in this study. To determine the maximum voluntary isometric contraction (MVIC) of the knee extensors muscle group, three sets of isometric contractions of knee extension were performed for five seconds with five minutes of rest between sets. The fatigue protocol consisted of 10 sets of 10 maximal concentric contractions of the extensor on the right knee, performed at 75% of MVIC with an interval of 45". Results: Significant reductions were observed (p<0.01), both in isometric strength (-34±4%) and the dynamic strength (-40 ± 3%). In addition, the slope of relationship strength x repetition was -0.79±0.07 Nm/repetitions and the magnitude of the effect reached -8.90. Conclusion: The protocol was useful to induce peripheral fatigue, although muscle strength is greater in the active group. In both isometric and dynamic action, muscle fatigue did not differ between groups

Mitochondrial physiology

As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery

Mitochondrial physiology

As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery

Catálogo Taxonômico da Fauna do Brasil: setting the baseline knowledge on the animal diversity in Brazil

The limited temporal completeness and taxonomic accuracy of species lists, made available in a traditional manner in scientific publications, has always represented a problem. These lists are invariably limited to a few taxonomic groups and do not represent up-to-date knowledge of all species and classifications. In this context, the Brazilian megadiverse fauna is no exception, and the Catálogo Taxonômico da Fauna do Brasil (CTFB) (http://fauna.jbrj.gov.br/), made public in 2015, represents a database on biodiversity anchored on a list of valid and expertly recognized scientific names of animals in Brazil. The CTFB is updated in near real time by a team of more than 800 specialists. By January 1, 2024, the CTFB compiled 133,691 nominal species, with 125,138 that were considered valid. Most of the valid species were arthropods (82.3%, with more than 102,000 species) and chordates (7.69%, with over 11,000 species). These taxa were followed by a cluster composed of Mollusca (3,567 species), Platyhelminthes (2,292 species), Annelida (1,833 species), and Nematoda (1,447 species). All remaining groups had less than 1,000 species reported in Brazil, with Cnidaria (831 species), Porifera (628 species), Rotifera (606 species), and Bryozoa (520 species) representing those with more than 500 species. Analysis of the CTFB database can facilitate and direct efforts towards the discovery of new species in Brazil, but it is also fundamental in providing the best available list of valid nominal species to users, including those in science, health, conservation efforts, and any initiative involving animals. The importance of the CTFB is evidenced by the elevated number of citations in the scientific literature in diverse areas of biology, law, anthropology, education, forensic science, and veterinary science, among others