Jacir Dal Magro

• Dr
• Community University of Chapecó Region - Unochapecó

Fluctuations in food availability and larval density play pivotal roles in shaping the characteristics of Aedes ( Stegomyia ) aegypti (L.) (Diptera: Culicidae) mosquito populations through intraspecific competition. Competition for limited resources drives density‐dependent effects, influencing survival rates, time to pupation, and the size and lif...

This study presents data on the water quality of the Guarani Aquifer based on samples collected from distinct groundwater wells in the western region of Santa Catarina State, Brazil. Among the analyses performed, the results indicated the need for treatment to ensure suitability for human consumption, particularly concerning Fe³⁺ and Mn²⁺ ions. Acc...

Mosquitoes, particularly Aedes aegypti, pose significant public health risks by transmitting diseases like dengue, zika and chikungunya. Bacillus thuringiensis var. israelensis (BTI) is a crucial larvicide targeting mosquitoes while sparing other organisms and the environment. This study evaluated the effects of sublethal BTI doses on Ae. aegypti l...

This study aimed to evaluate the effect of seasonality on the chemical composition and the antimicrobial and antioxidant activities of the essential oil from Aloysia gratissima leaves (AGO). The essential oils were extracted from dried and crushed A. gratissima leaves using hydrodistillation. The chemical composition of AGO was analyzed by gas chro...

Mosquitoes, particularly Aedes aegypti, pose significant public health risks by transmitting diseases like dengue, zika and chikungunya. Bacillus thuringiensis var. israelensis (BTI) is a crucial larvicide targeting mosquitoes while sparing other organisms and the environment. This study evaluated the effects of sublethal BTI doses on Ae. aegypti l...

BACKGROUND Mosquito larvae coexist with different species of predators in small freshwater bodies. These environments can vary widely in terms of the amount of food and larval densities. Our objective was to understand the impacts of the non‐lethal threat of predation, combined with competition effects on Aedes aegypti development and adult life cy...

Diabetes mellitus is associated with chronic wound-healing problems that significantly impact patients’ quality of life and substantially increase expenditure on healthcare. Therefore, the identification of compounds that can aid healing is justified. Anredera cordifolia (Ten.) has been used in folk medicine for curative purposes; however, the caus...

Introduction: Alternanthera brasiliana, commonly known as Penicillin, belongs to the Amaranthaceae family and is popularly used in the treatment of various pathologies due to its anti-inflammatory, antibacterial and analgesic properties and its inhibitory activity against the herpes simplex virus. Despite its empirical use, pharmaceutical industry...

Abstract Background and aim Aloysia gratissima is used in popular medicine as an analgesic and sedative. However, studies on its biological activities are still scarce. Therefore, this work aimed to evaluate the antinociceptive and anti-inflammatory effect of A. gratissima leaves essential oil (OAG) in mice. Experimental procedure The OAG was obtai...

The CH4 storage by adsorption on activated carbons for natural gas handling has gained interest due to the appearance of lightweight materials with large surface areas and pore volumes. Consequently, kinetic parameters estimation of the adsorptive process can play a crucial role in understanding and scaling up the system. Concerning its versatility...

The reproductive success of mosquitoes is heavily influenced by females' ability to select suitable oviposition sites for the proper development of their offspring. Many of these potential habitats may harbor predators, and the detection of these predators is crucial for assessing the risk of predation, which can, in turn, influence the behavior of...

Leaf litter breakdown is a critical process in ecosystems, influencing food webs and biogeochemical cycles, particularly in inorganic soils such as those found in highland grassland systems. Our experiment examined the leaf litter breakdown of two species, Eucalyptus grandis (exotic) and Inga uruguensis (native), in the soil of riparian zones at su...

O objetivo deste trabalho foi avaliar o efeito da adição de diferentes adubações alternativas, adicionadas àquela recomendada para a cultura, sobre aspectos produtivos e qualitativos do morangueiro. O trabalho utilizou a cultivar Albion em sistema semi-hidropônico aberto, o delineamento foi Inteiramente Casualizado (DIC) com seis tratamentos e quat...

Major efforts to control the population of Aedes aegypti mosquitoes involve the use of synthetic insecticides, which can be harmful to the environment. Most plant compounds are eco-friendly and some of them have biocontrol potential, whereas a fraction of these compounds is released into the environment through the leaf-leaching process. We evaluat...

Aedes aegypti mosquito larvae develop in various aquatic microhabitats, including water-holding tires, cups and bottles. These environments may vary in nutritional characteristics, an important factor for the development of larvae and resulting adult mosquitoes. Compromised larval nutrition can result in developmental failure or affect the growth a...

In Brazil, the use of Eucalyptus is focused on the production of wood or pulp for the paper industry but without any general recovery of waste, with leaves and branches being left on the ground. One possibility is to use these residues as raw materials in the production of industrially relevant and value-added compounds such as essential oil. The a...

Hop essential oil (EO) generates interest for its antioxidant and antimicrobial properties, in addition to the volatile compounds that are responsible for the hop aroma in beer. Thus, the objective of this study was to evaluate the chemical composition, EO yield, and antibacterial activity of hop essential oil from hops of the Chinook variety again...

Changes in riparian vegetation can alter the input and quality of leaf litter in aquatic ecosystems, but the effects of these changes on litter fragmentation by invertebrate shredder communities in tropical streams remain poorly studied. The caddisfly genus Phylloicus Müller, 1880 (Trichoptera: Calamoceratidae) is highly abundant in Neotropical str...

Microencapsulation is an alternative to increase the survival capacity of microorganisms, including Yarrowia lipolytica, a widely studied yeast that produces high-value metabolites, such as lipids, aromatic compounds, biomass, lipases, and organic acids. Thus, the present study sought to investigate the effectiveness of different wall materials and...

Silver nanoparticles incorporated into magnetic nanocomposite were synthesized using a crude methanolic extract from Piper solmsianum, which was used as an agent for reduction and stabilization in phytochemical-assisted synthetic nanomaterial. The antimicrobial activity of the pathogenic microorganisms is reported here. The synthesized nanoparticle...

A importância de demonstrar a qualidade de medições químicas está cada vez mais exigida. Dados analíticos não confiáveis podem comprometer conclusões e tomadas de decisão gerando prejuízos, podendo muitas vezes colocar em perigo a saúde pública. Para garantir que um método analítico gere informações confiáveis ele deve passar por uma avaliação crit...

Biological control is one of the methods available for control of Aedes aegypti populations. We used experimental microcosms to evaluate the effects of actual predation and predation risk by dragonfly larvae (Odonata) on larval development, adult longevity, and adult size of Ae. aegypti . We used six treatments: control, removal, variable density c...

Natural lentic microhabitats are important for aquatic invertebrate communities in subtropical aquatic systems, which are usually dominated by mosquitoes, predators and zooplankton. Subtropical lentic microhabitats might be strongly affected by top‐down effects of predators. We evaluated the predator effects on aquatic macroinvertebrate and zooplan...

Eucalyptus (family Myrtaceae), a native plant from Australia, is a genus cultivated due to its oil, gum, pulp and timber used worldwide for different commercial applications. It is a plant with significant economic importance and possibly its cultivation, in Brazil and other countries, has reduced the exploitation of native trees. The secondary met...

Aloysia gratissima is a plant native to America, with applications in folk medicine for a wide range of diseases, such as bronchial infections, lung disorders, nervous system disorders (depression, anxiety), and inflammatory processes, among others. However, investigations about this species and its biological actions are still scarce. This literat...

Biodiesel (fatty acid methyl esters – FAME) can be produced by enzyme-catalyzed hydroesterification, which is suitable for processing low-cost feedstocks with high content of free fatty acids, phospholipids, and moisture. Thus, this work aimed at synthesizing FAME in a one-step process, performing degumming and hydroesterification of non-degummed s...

Maize is a cereal widely cultivated and consumed on the planet and, as an agricultural commodity, research strategies addressing productive bottlenecks are then highly appreciated. Among these, pest insects stand out for causing losses both in the field and in warehouses. Thus, thinking about the sustainability of the productive system, there is a...

Background and aim Campomanesia xanthocarpa Berg. (Myrtaceae) present several pharmacological actions, but there are no reports on its antidepressant-like potential. This study investigated the antidepressant-like effect and mechanism of action of Campomanesia xanthocarpa seeds extract obtained from supercritical CO2 (40 °C, 250 bar). Experimental...

Riparian zones are important interface areas between soil and stream systems. Few studies carried out in tropical and subtropical regions evaluate litter decomposition in both stream water and riparian soils. Herein, we assessed the effects of land cover on microbial activity on the decomposition of an exotic litter (Pinus elliottii pine needles on...

In regions with intense agricultural activity, increases in heavy metal concentrations in aquatic environments are common. Among the metals associated with agricultural activities, copper (Cu) and cadmium (Cd) have been found to directly affect aquatic trophic structures due to the ease of incorporation by primary producers and consuming organisms....

Ethnopharmacological relevance Maytenus ilicifolia Mart. ex Reissek, Celastraceae, is popularly known as “espinheira-santa” and used to treat pathologies related to the stomach. However, in popular culture, this species has also been used to treat other disorders such as diabetes, but without scientific evidence, requiring more phytochemical and ph...

The search for new therapies, derived from natural compounds in order to prevent and treat Parkinson's disease (PD) has aroused the interest of many researchers. Spondias mombin (L) has active constituents with known antioxidant and anti-inflammatory activities. The aim of this study was to evaluate the neuroprotective potential of the hexane extra...

Campomanesia xanthocarpa is a plant species traditionally used in the treatment of diabetes, fever, hypercholesterolemia, obesity, and urinary tract diseases. The anti-inflammatory effects of C. xanthocarpa leaves in mice were already known. Nevertheless, studies on the anti-inflammatory activity of its seeds are still lacking. The aim of this stud...

The search for new therapies, derived from natural compounds in order to prevent and treat Parkinson's disease (DP) has aroused the interest of many researchers. Spondias mombin L. It has a high content of phenolic compounds with known antioxidant activity and is used in ethnomedicine to treat inflammatory and memory disorders. The aim of this stud...

Introduction: Maytenus ilicifolia Mart. Ex Reiss, Celastraceae, popularly known as “espinheira-santa” is traditionally used to treat gastrointestinal disorders and diabetes. However, studies proving efficacy for the treatment of diabetes are scarce. Furthermore, it is believed that the presence of chemical constituents responsible for pharmacologic...

Campomanesia xanthocarpa, a plant belonging to the Myrtaceae family, is popularly known as gabiroba. Leaves of gabiroba has been popularly used to treat various diseases, including inflammatory, renal, and digestive, among others. Additionally, studies have shown an effect to reduce blood cholesterol levels. The aim of this study was to evaluate th...

Silver has a potent antimicrobial action, but its use is still restricted due to toxicity and aggregation problems. Impregnation with active carbon (AC) has been suggested as an alternative to solve this problem. In this study, termite feces were used to prepare composites containing silver nanoparticles and AC. Reducing agents and different amount...

Background Aloysia gratissima is a shrub used in folk medicine as analgesic and sedative. However, studies on its antinociceptive activity are scarce. This research aimed to evaluate the antinociceptive effect of a supercritical carbon dioxide (SCCO2) extract of A. gratissima leaves (EAG) in mice. Materials and methods A. gratissima leaves were su...

Pterodon spp. is a native Brazilian tree species of Fabaceae family, popularly known as sucupira. In the present study, the extraction methods of Soxhlet, supercritical fluid extraction (SFE) and ultrasound assisted extraction (UAE) were conducted at different conditions to recover compounds from “sucupira” with larvicidal activity against Aedes ae...

Sitophilus zeamais is one of the more important and severe pests of stored grains. Its control is carried out predominantly by synthetic insecticides, a practice that must be rethought assuming the increasing demands for pesticide-free foods. This work aimed at evaluating the bioactivity of Eucalyptus cv. “Urocam” essential oil on 10- to 30-day-old...

A silicon/polyaniline/horseradish peroxidase enzyme (n-Si/PANI/HRP) electrode was obtained by potentiostatic electrodeposition processes. PANI thin films were electropolymerized on a silicon substrate at different electric potentials, and an HRP enzyme was electrodeposited on the best PANI thin film. The best PANI thin film was obtained under elect...

This work aims to evaluate the effects of temperature and pressure on the extraction yield and chemical composition of the supercritical CO2 (SCCO2) extracts of A. gratissima leaves (EAG) and then to investigate in vivo anti-inflammatory activity of the extracts. The leaves of A. gratissima were extracted with supercritical CO2 at 40, 50 and 60 °C...

The mosquito Aedes aegypti L. (Diptera: Culicidae) is a vector of arboviral diseases such as dengue fever. Currently, the main approach to mosquito control is the application of synthetic insecticides, which can lead to negative environmental impacts and insecticide resistance in mosquito populations. As such, there has been increased interest in d...

O objetivo deste trabalho foi avaliar o efeito do uso de larvas predadoras da ordem Odonata (família Libellulidae) associado ao BTI na redução larval de mosquitos. Foi testada a hipótese de que na presença de larvas de predadores haveria aumento na mortalidade de larvas de A. aegypti causada pelo efeito sinergético do BTI juntamente com o predador....

The objective of this study was to evaluate the quality of groundwater located in the west of Santa Catarina state, at Serra Geral Aquifer System (SGAS). It was selected 100 deep tubular wells distributed in urban and rural areas. 300 wells samples were collected at three different periods (march, september and november of 2014), which were submitt...

RESUMO O estudo da atividade metanogênica específica (AME) constitui uma importante ferramenta para o controle operacional de reatores anaeróbios, pois apresenta parâmetros de monitoramento da eficiência e estabilidade de um reator biológico. Nesse sentido, o presente trabalho visou determinar a AME de lodos provenientes de reatores anaeróbios de f...

Many of the species used in popular medicine do not have their biological activities already proven by scientific studies. Among these species, the endemic South American Philodendron bipinnatifidum Schott ex Endl deserves special attention since it is already in use in popular medicine for inflammation cases, such as erysipelas, orchitis and ulcer...

Magnetic silver nanoparticles (MNPAg) are interesting nanotechnology materials with borderless environmental science, that can be used to disinfect water contaminated with pathogenic bacteria. The use of MNPAg leads to increased risk of nanomaterial contamination in the environment, especially natural water sources, with harmful effects on the ecos...

The mosquito Aedes aegypti has overcome all kinds of human being mosquito control attempts over the last century. Strategies for vector population control resorts to the use of synthetic insecticides, which can lead to problems of intoxication in humans and environmental contamination. We evaluated the effects of different preparations age plant ex...

Analysing which environmental features influence structure of communities is important to establish management and conservation priorities for regional biodiversity. In this study, we analysed the structure of amphibian larval assemblages in southern Brazilian streams and their relationships with local and landscape factors. We sampled tadpoles in...

Iron (Fe) and manganese (Mn) are metals commonly found at high concentrations in underground water. These metals are essential for the good functioning of living organisms, but high concentrations lead to imbalance, potentiating the appearance of pathologies. This study aimed to evaluate the effect of exposure to naturally occurring metals in groun...

O presente estudo teve como objetivo testar a eficiência do extrato supercrítico de Melia azedarach no controle de Sitophilus zeamais por meio do contato tarsal. Observou-se a sobrevivência dos insetos a cada 24 h após o início do experimento. Constatou-se que houve maior mortalidade de insetos nas primeiras 72 h. O tratamento que teve melhor desem...

The feedstock cost can comprise more than 75% of the overall biodiesel cost, and then economic issues are the main limitations of biodiesel production. This research focused on the use of alternative feedstock and production processes. The production of fatty acid esters from residues becomes an interesting alternative route since it is possible to...

The present study investigates the effects of [email protected]2O3 nanocomposites coated and uncoated with O-carboxymethylchitosan (OC) and synthesized with different reducing agents on Cucumis sativus seeds. The seeds were germinated and grown for 5 days in suspension at different concentrations of nanoparticles (0.1, 1, 10, 100 and 1000 mg L⁻¹)....

Ethnopharmacological relevance Popular medicine use stems of Philodendron bipinnatifidum (Araceae) in inflammation cases, such as in erysipelas, as well as orchitis and rheumatism treatment. The present study, conducted for the first time in literature, investigate the antinociceptive and anti-inflammatory activities of P. bipinnatifidum stems ethy...

The present work was performed to investigate if feeding Litopenaeus vannamei with microencapsulated thyme essential oil (TEM, 1.05 g thyme essential oil per 100-g powder) adsorbed on commercial pellet feed was able to protect shrimps against white spot syndrome virus (WSSV) disease. Five treatments were tested: uninfected shrimp fed with commercia...

Philodendron bipinnatifidum Schott ex Endl is a plant used in popular medicine with pharmacological actions already proven by scientific studies. The aim of this work was to investigate the application of Solution Enhanced Dispersion by Supercritical Fluids (SEDS) technique in the encapsulation of P. bipinnatifidum extract, rich in β-Sitosterol, in...

Jaboticaba Plinia peruviana (Poir.) Govaerts is a Brazilian berry that presents high levels of polyphenols, which may play a key role in preventing cytotoxic and genotoxic effects of harmful agents. Although copper is an essential micronutrient that plays an important role in organisms, high copper concentrations may trigger toxicity to animals and...

Objective Essential oils are widely used as flavors and fragrances in the food, cosmetic and pharmaceutical industries, especially the bergamot peel oil due to the high polyphenols content, compared to other citrus species. Two types of polyphenols present in bergamot peel oil, brutieridin and melitidin, are directly related to cholesterol biosynth...

In this work a special electrode configuration with potential application in enzymatic biosensors for the detection of glyphosate was studied. The enzyme used was Horseradish Peroxidase (HRP), which was immobilized on a polyaniline film (PAni), electrodeposited on the surface of the n-type monocrystalline silicon electrode. PAni has the ability to...

In regions where there is intense polluting activity, a greater availability of metals in water impounded by dams increases theavailability and contamination of the fauna and flora. Thus, we assessed the accumulation of metals in muscle and gills of fish ofdifferent trophic levels in the area of influence of Foz do Chapecó hydroelectric plant on th...

Environmental pollution caused by the disposal of chemicals or toxins into the environment represent a great threat to amphibians. In this study, it was evaluated which environmental factors of ponds under the influence of coal-mining influence the composition of anuran species. For this purpose, anuran samples were performed in ponds in coal extra...

The intense use of synthetic products for the control of Aedes aegypti has led to the development of resistance and imposes health risks to other flora and fauna. This study assessed the larvicidal potential of Melia azedarach (Meliaceae) fruit extract obtained by the supercritical carbon dioxide extraction method and Bacillus thuringiensis var. is...

Os efluentes de indústrias alimentícias têm como principais constituintes os lipídeos, caracterizados por óleos, gorduras e ácidos graxos livres. Esses compostos, quando não tratados adequadamente, causam danos severos ao meio ambiente, como a formação de filmes de óleo e espumas nas superfícies aquáticas, flotação da biomassa, toxicidade a determi...

Oxidative stress and DNA damage are involved in the glyphosate-based herbicide toxicity. Uncaria tomentosa (UT; Rubiaceae) is a plant species from South America containing bioactive compounds with known beneficial properties. The objective of this work was to evaluate the antioxidant and antigenotoxic potential of UT extract in a model of acute exp...

The occurrence of ractopamine (RAC) hydrochloride in water bodies is of significant concern due to its ecological impacts and toxicity to humans. RAC hydrochloride is a β-adrenergic agonist drug used as a feed additive to (1) improve feed efficiency, (2) rate of weight gain, and (3) increase carcass leanness in animals raised for their meat. This d...

With the present project, the phytochemical composition of Uncaria tomentosa cultivated in Chapecó (Brazil) was analyzed and then the potential of using this local plant extract to protect by oral feeding virus-infected Litopenaeus vannamei shrimp was also investigated. For this study, five treatments were tested: uninfected shrimp fed with pellete...

In this paper, nano-hybrid particles of Ag@Fe2O3 based on O-carboxymethylchitosan were successfully synthesized using different reducing agents (NaBH4, sucrose) and without reducing agent. The smallest silver nanoparticles were those prepared without reducing agent (∼5±3nm). The average size of silver particles prepared with NaBH4 is around 5-15nm,...

The aims of this research were first, to evaluate the antibacterial potential of commercial thyme essential oil against V. alginolyticus and V. parahaemolyticys and second, using the spray drying technique to produce microcapsules. chemical compounds of thyme oil and microcapsules were identified and quantified being thymol the chemical component p...

This short note compares the chemical profile of pecan nut oil samples obtained from pressurized n-butane and cold pressing with two commercial oils. The conventional cold pressing technique yielded 58.9 wt%, while pressurized n-butane yielded from 53 to 65 wt%, being the highest yield at 55 °C, and pressure of 40 bar. The n-butane behaves nearly l...

Nanowires of carbon coated ferric oxide (Fe2O3/C) have been studied to be applied at an electrochemical glucose biosensor as a new type of carbon paste electrode (CPE) modifier. The Fe2O3/C was synthesized by adapting co-precipitation hydrothermal route. Firstly, amperometric sensor based on a modified CPE doped with Fe2O3 has been developed and co...

Essential oils, their antimicrobial properties due to arouse interest in the food industry for use as antimicrobial additives. However, due to their low thermal and oxidative stability its application is limited. Among the essential oils, eugenol is a compound already used studied due to their numerous properties. To minimize the degradative effect...

This study evaluated water parameters in ponds affected by coal extraction. Allium cepa assay was used to measure genotoxicity/mutagenicity of the sediment. Samples were collected from four ponds in the southern state of Santa Catarina. Water temperature, pH, dissolved oxygen, conductivity and turbidity were measured. Sediments were analyzed for he...

The objectives of this research were to study the phytochemical composition of Cynodon dactylon and investigate if the oral administration of this plant extract adsorbed on the pellet feed was capable of protecting L. vannamei challenged with white spot syndrome virus (WSSV). The shrimps were distributed into five batches, and experiments were run...

Hydropower offers a reliable source of electricity in several countries, and Brazil supplies its energy needs almost entirely through hydropower plants. Nevertheless, hydropower plants comprise large buildings and water reservoirs and dams, resulting in huge ecological disruptions. Here, we analyzed the impact of four hydropower reservoirs construc...

The extraction of litchi (Litchi chinensis Sonn.) and oat (Avena sativa L.) seeds were investigated using n-butane as pressurized solvent by evaluating the effect of pressure in the range of 7–100 bar and temperature from 25 to 70 °C on the extract yield and chemical composition together with the antioxidant activity of the extracts obtained. It wa...

One of the major problems in effluent treatment plants of the cellulose and paper industry is the large amount of residual sludge generated. Therefore, this industry is trying to develop new methods to treat such residues and to use them as new products, such as adsorbents. In this regard, the objective of this work was to develop an adsorbent usin...

Eugenol is natural oil that has excellent antibacterial properties but cannot be used to fabricate many products that require thermal processing. One possible alternative to the use of the eugenol molecules in high-temperature processes is the encapsulation of these molecules in a structure that is not toxic and is resistant to thermal treatment. T...

Food security is very important in all processes executed for the manufacture of meat in meatpacking industries. Meat security can be improved by the use of accessories produced with antimicrobial materials in the manufacture lines. In this work, the antibacterial property was incorporated in the plates of polyamide 6 by the addition of two antibac...

Traditionally, Ilex paraguariensis leaves are consumed in tea form or as typical drinks like mate and terere, while the fruits are discarded processing and has no commercial value. The aim of this work to evaluate phytochemical properties, total phenolic compounds, antioxidant and antimicrobial activity of extracts of Ilex paraguariensis fruits obt...

This study assessed the limnology from the Medium Uruguay River Basin in Uruguaiana, Brazil, with a focus on the concentration of heavy metals (Cd, Cu, and Mn), to assess the toxicological potential (cytotoxicity and genotoxicity) for humans using as biological matrix of study human leukocyte cells. The conductivity, resistivity, and dissolved O2 l...

The objective of this research was to study the phytochemical composition of Cynadon dactylon and investigate if the oral administration of this plant extract adsorbed on the pellet feed was capable of protecting L. vannamei challenged with white spot syndrome virus (WSSV). The shrimps were distributed into 5 batches and experiments were run by tri...

Most paints used for printing in the graphic industry contain traces of heavy metals that are dissolved and carried in the effluent, and the risk posed by these contaminants in the environment is associated with toxicity and bioaccumulation in living beings. The aim of this study was to evaluate the use of natural clinoptilolite zeolite (CL) as ads...