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Sublethal Doses of Insecticides Affect the Fecundity and Fertility of the <i>Chrysodeixis includens</i>?

American Journal of Plant sciences 2018年第3期9卷 483-494页

作者： Raimundo Henrique Ferreira Rodrigues Luciana Barboza da Silva Thiago Ferreira Rodrigues Gleidyane Novais Lopes Eliane Carneiro Bruno Ettore Pavan Post-Graduation Program in Plant Science Agronomy Universidade Federal do Piauí Bom Jesus Brazil Faculty of Engineering UNESP Ilha Solteira Universidade Estadual Paulista Ilha Solteira Brazil

The objective was to determine lethal concentrations and to evaluate the effects of sublethal doses of insecticides on Chrysodeixis includens under laboratory conditions. The standard population of C. includens was kept on artificial diet under controlled conditions (25°C ± 5°C, 60% ± 10 RU, 12:12 h). The active principles used were B. thuringiensis, Indoxacarb and Teflubenzuron. The CL25 and LC50 obtained from dose response curve (estimated from eight concentrations of each active principle) were diluted in water and applied to the back of third instar caterpillars and compared to the control (water). The insecticides used showed lethal and sublethal effects in C. includens. Bacillus thuringiensis was 6.21 and 2.79 times more toxic to soybean looper when compared to the products Indoxacarb and Teflubenzuron, respectively. Insecticides applied to the caterpillars reduced survival and affected the biomass gain with increased larvae and pupae longevity, with a significant reduction in fertility (40%) and fecundity (94.97%) in adults. In the present study it was observed that both survival and larval biomass gain have a direct effect on fecundity and fertility, respectively. Therefore the active ingredients Indoxacarb, Teflubenzuron and B. thuringiensis can be used in rotation as a tool in the C. includens.

关键词： Bacillus thuringiensis Chemical Control Indoxacarb Soybean Looper Teflubenzuron

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Evaluation of phase formation and physical-mechanical properties of Portland cements produced with civil construction waste

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CEMENT 2021年 5卷

作者： F.N. Costa D.V. Ribeiro Post-Graduate Program in Civil Engineering (PPEC)/Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil Department of Materials Science and Technology Federal University of Bahia Rua Aristides Novis 02. Federação Salvador BA 40210-630 Brazil

Cement is the most widely used building material worldwide. Its production demands a large amount of natural resources, in addition to high energy consumption. Thus, the cement industry has been looking for solutions that effectively reduce the use of these resources as well as greenhouse gas emissions. This research aims to show the technical feasibility of incorporating civil construction waste (CCW) in the production of Portland cement. To this purpose, the physicochemical characterization of the raw materials used was carried out, dosage and manufacture of the raw mix, which were calcined at 1450 °C. Clinkers were characterized mineralogically, by means of XRD, to verify the formation of the crystalline phases. Subsequently, the clinkers were ground, resulting in Portland cements, and their physical-mechanical properties were evaluated. The results showed the potential of using CCW as an alternative raw material, since experimental cements presented performance similar to industrial cements used as a reference.

关键词： Civil construction waste (CCW Reuse Environment Cement Compressive strength

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Retraction notice to "Pyrolysis: An effective technique for degradation of COVID-19 medical wastes" [Chemosphere 275 (2021) 130092]

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Chemosphere 2025年 370卷 143824页

作者： Selvakumar Dharmaraj Veeramuthu Ashokkumar Rajesh Pandiyan Heli Siti Halimatul Munawaroh Kit Wayne Chew Wei-Hsin Chen Chawalit Ngamcharussrivichai (Deemed to be University) Chennai 603112 Tamil Nadu India. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand. Department of Biochemistry Karpagam Academy of Higher Education (formerly Karpagam University) Pollachi Main Road Eachanari Post Coimbatore Tamil Nadu India. Chemistry Study Program Department of Chemistry Education Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi 229 Bandung 40154 Indonesia. School of Energy and Chemical Engineering Xiamen University Malaysia Jalan Sunsuria Bandar Sunsuria 43900 Sepang Selangor Malaysia College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China. Department of Aeronautics and Astronautics National Cheng Kung University Tainan 701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung 407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung 411 Taiwan. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand Center of Excellence on Petrochemical and Materials Technology (PETROMAT) Chulalongkorn University Pathumwan Bangkok 10330 Thailand.

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Cladophialophora bantiana metabolites are efficient in the larvicidal and ovicidal control of Aedes aegypti, and Culex quinquefasciatus and have low toxicity in zebrafish embryo

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The science of the total environment 2022年 852卷 158502页

作者： Chinnasamy Ragavendran Govindasamy Balasubramani Cherian Tijo Venkatesan Manigandan Eliningaya J Kweka Pandi Karthika Palaniappan Sivasankar Adelina Thomas Devarajan Natarajan Ismini Nakouti Guilherme Malafaia Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India Department of Cariology Saveetha Dental College and Hospitals Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 600 077 India. Electronic address: ragavan889@***. Department of Research and Innovation Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMATS) Chennai 602105 Tamil Nadu India. Department of Ocean Studies and Marine Biology Pondicherry University Port Blair Campus Brookshabad Port Blair Andamans 744112 India. University of Texas Health Science Center San Antonio TX USA. Division of Livestock and Human Diseases Vector Control Tropical Pesticides Research Institute P.O. Box 3024 Arusha Tanzania Department of Medical Parasitology and Entomology Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Natural Drug Research Laboratory Department of Biotechnology School of Biosciences Periyar University Salem 636 011 Tamil Nadu India. Water Supply and Bioeconomy Division Faculty of Environmental Engineering and Energy Poznan University of Technology Berdychowo 4 60-965 Poznan Poland. School of Pharmacy Catholic University of Health and Allied Sciences P.O. Box 1464 Mwanza Tanzania. Centre for Natural Products Discovery (CNPD) School of Pharmacy and Biomolecular Sciences Liverpool John Moores University Liverpool L3 3AF UK. Laboratory of Toxicology Applied to the Environment Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia Uberlândia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás Goiânia GO Brazil. Electronic address: guilhermeifgoiano@gmail.com.

Mosquitoes' current insecticide resistance status in available public health insecticides is a serious threat to mosquito control initiatives. Microbe-based control agents provide an alternative to conventional pesticides and insecticides, as they can be more targeted than synthetic insecticides. The present study was focused on identifying and investigating the mosquitocidal potential of Cladophialophora bantiana, an endophytic fungus isolated from Opuntia ficus-indica. The Cladophialophora species was identified through phylogenetic analysis of the rDNA sequence. The isolated fungus was first evaluated for its potential to produce metabolites against Aedes aegpti and Culex quinquefasciatus larvae in the 1-4th instar. The secondary metabolites of mycelium extract were assessed at various test doses (100, 200, 300, 400, and 500 μg/mL) in independent bioassays for each instar of selected mosquito larvae. After 48 h of exposure, A. aegypti expressed LC values of 13.069, 18.085, 9.554, and 11.717 μg/mL and LC = 25.702, 30.860, 17.275, and 19.601 μg/mL; followed by C. quinquefasciatus LC = 14.467, 11.766, 5.934, and 7.589 μg/mL, and LC = 29.529, 20.767, 11.192, and 13.296 μg/mL. The mean % of ovicidal bioassay was recorded 120 h after exposure. The hatchability (%) was proportional to mycelia metabolite concentration. The enzymatic level of acetylcholinesterase in fungal mycelial metabolite treated 4th instar larvae indicated a dose-dependent pattern. The GC-MS profile of C. bantiana extracts identified five of the most abundant compounds, namely cyclobutane, trans-3-undecene-1,5-diyne, 1-bromo-2-chloro, propane, 1,2,3-trichloro-2-methyl-, 5,5,10,10-tetrachlorotricyclo, and phenol, which had the killing effect in mosquitoes. Furthermore, the C. bantiana fungus ethyl acetate extracts had a strong larvicidal action on A. aegypti and C. quinquefasciatus. Finally, the toxicity test on zebrafish embryos revealed the induction of malformations only at concentrations above 1 m

关键词： Biopesticide Ecotoxicity Endophytic fungal Mosquitoes Vector control

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Fabrication and characterization of nano-zirconia produced by aqueous-based tape casting

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materials Today: Proceedings 2017年第11期4卷 11506-11511页

作者： Micheline dos Reis Araújo Wilson Acchar Post-Graduation Program of Science and Materials Engineering Federal University of Rio Grande do Norte (UFRN) Natal Brazil

In this work, aqueous-based tape casting was used to produce nano-zirconia substrates. Rheological properties of the slurries were measured at room temperature. The acrylic-based suspensions showed a pseudoplastic behavior and remained stable and homogeneous. Warm pressing was used to laminate two or more cast tapes, in order to produce SOFC structures. Strength behavior of the sintered and laminates tapes was also evaluated.

关键词： Nano-zirconia Tape casting Rheogical properties

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Ionic oxidation in cathodic cage of titanium CP grade II

Ionic oxidation in cathodic cage of titanium CP grade II

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作者： Vitoriano, Jussier Oliveira Braz, Danilo Cavalcante Barbosa, Geovani Ferreira Araújo, Francisco Odolberto Alves, Clodomiro Post-Graduate Program in Materials Science and Engineering Universidade Federal Rural do Semi-Árido Brazil

Titanium oxides such as rutile and anatase, are materials that stand out for exhibiting properties that act in biomedical and photocatalytic applications, among others. It is extreme importance to idealize new techniques that produce such compounds, being indispensable the improvement of characterizations for these materials. For this purpose, titanium comercially pure (CP) grade II cylindrical samples were oxidized ionically using titanium cage electric shields, oxidized at 350 ° C in 3 and 8 hours. Through Grazing Incidence X-ray Diffraction (GIXRD) analysis, was observed on the surface of the treated samples the formation of a TiO2 film with the anatase, rutile and brookite phases, the latter phase cited being difficult to produce in conventional thermochemical treatments. All samples treated showed a significant increase in wettability using distilled water. The higer value was for the sample with a 8 hours treatment time, in which this condition presented phases with greater intensity in the analysis of GIXRD. © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Titanium dioxide

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Synthesis of cobalt ferrite (CoFe2O4) by combustion with different concentrations of glycine

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IOP Conference Series: materials science and engineering 2019年第1期659卷

作者： C G Kaufmann Junior R Y S Zampiva A K Alves C P Bergmann L Giorgini Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil Post-Graduation Program in Production and Transport Engineering (PPGEP) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil Department of Industrial Chemistry 'Toso Montanari' University of Bologna Viale del Risorgimento 4 40136 Bologna Italy

Among the wide range of applications of Cobalt Ferrite (CoFe2O4), its usage for the manufacturing of modern electronic devices such as solar panels, capacitors and batteries has been studied' lately. Hence, solar-powered vehicles, which strongly rely their performance on energy efficient electronics, is a sector that could particularly benefit from enhanced applications of such material. In this work, the synthesis of Cobalt Ferrite was studied by means of Solution Combustion Synthesis (SCS) using iron nitrate nonahydrate and cobalt nitrate hexahydrate as precursors, and glycine as fuel. The nitrates were dissolved in distilled water and placed under stirring and heating for 5 minutes; when the temperature reached 60°C, glycine was added; after complete homogenization, the solution was placed in an electric oven (400°C) until complete combustion (approximately 15 minutes). Three syntheses were carried out using different concentrations of fuel: lean, stoichiometric and rich. The product crystallite size and composition were investigated in order to determine the influence of the fuel concentration on the structure of the produced cobalt ferrite.

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Experimental analysis of jet slurry erosion on martensitic stainless steel

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IOP Conference Series: materials science and engineering 2019年第1期659卷

作者： G Santacruz AS Takimi F Vannucchide Camargo CP Bergmann Post-Graduation Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul - UFRGS Osvaldo Aranha 99 Porto Alegre RS 90035-190 Brazil Department of Industrial Engineering University of Bologna Viale del Risorgimento 2 40136 Bologna Italy

Due to their enhanced tribological properties that contribute to an increased useful life of components, martensitic stainless steels are an excellent option for industrial applications such as hydroelectric, petrochemical, civil construction and mineral processing plants. In the present investigation, the erosive wear of AISI 410 martensitic stainless steel is evaluated after thermal treatment by quenching and tempering by mass loss, under erosive attack at 30° and 90° incidence angles, using a self-made jet slurry erosion equipment controlling parameters such as speed, volume of fluid, temperature and concentration of erosive particles of erodent. The characterization of the eroded samples was carried out in terms of the microstructure (SEM) and microhardness as well as the particle size distribution (LG) and morphology of the erodent. It was possible to establish the relationship between the slurry erosive wear and the physical properties inherent of stainless steel for this particular experimental configuration, concluding that the steel presents better resistance to jet slurry erosion wear when compared to austenitic steel commonly used in the industry.

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Surface treatment of Kevlar® polyaramid fibers with imidazolium-based ionic liquids 11

Surface treatment of Kevlar® polyaramid fibers with imidazo...

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11th Annual TechConnect World Innovation Conference and Expo, Held Jointly with the 20th Annual Nanotech Conference and Expo, and the 2017 National SBIR/STTR Conference

作者： Moraes, C. Schrekker, H.S. Amico, S.C. Post-Graduation Program in Mining Metallurgical and Materials Engineering Federal University of Rio Grande do Sul Porto Alegre Brazil Laboratory of Technological Processes and Catalysis Institute of Chemistry Federal University of Rio Grande do Sul Porto Alegre Brazil

ISBN: (纸本)9780997511789

Polyaramid fibers have excellent mechanical properties, such as high tensile strength-to-weight ratio and high thermal stability, but its applicability as reinforcement for composite materials is limited due to its high crystallinity and inert and smooth surface. In this work, an imidazolium-based ionic liquid (l-Butyl-3-methylimidazolium chloride) was used to treat Kevlar polyaramid fibers with the aim of improving Kevlar and epoxy resin interaction. The fibers were characterized by infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM). Tensile strength tests were carried out to verify loss of mechanical properties caused by the treatment. Contact angle measurements and pull-out tests verified an improvement of the wettability and adhesion between the fibers and epoxy resin. The interfacial shear strength (IFSS) was improved by 37% and the contact angle was decreased from 35° to 22.

关键词： Epoxy resins

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Sequential deposition method of TiO2/CH3NH3PbI3 films for solar cell application

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IOP Conference Series: materials science and engineering 2019年第1期659卷

作者： A E R T P Oliveira F Bonatto A K Alves C Fragassa Post-Graduation Program in Mining Metallurgy and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Osvaldo Aranha 99 90035-190 Porto Alegre Brazil InterDepartmental Centre for Industrial Research on Advanced Applications in Mechanical Engineering & Materials Technology Alma Mater Studiorum University of Bologna viale Risorgimento 2 40136 Bologna Italy

Seeking to study innovative solar cell compositions with the goal to reach the highest energy efficiency level attainable, the aim of this study was to develop a route to obtain a solar cell composed by hybrid perovskite (CH3NH3PbI3) using a sequential deposition method through the techniques of spin-coating and immersion. Initially, the deposition of PbI2 thin film of was performed on a FTO/glass substrate coated with TiO2, which was subsequently converted into perovskite crystals through spin coating using a CH3NH3I solution. The influence of the PbI2 layer thickness on the formation of CH3NH3PbI3 crystals was evaluated. The hydrophilic characteristic of TiO2 affects the distribution of the crystals nucleation sites, since PbI2 possesses a non-polar liquid characteristic. The characterization of the perovskite thin films showed that thickness affects directly the bandgap and the surface morphology, revealing the presence of dendritic structures and acicular crystals. Both growth and coverage increased for thinner layers of PbI2. It was also possible to observe an increased uniformity in the film for smaller PbI2 layers.

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