A5082557667- Synthesis and Reactions of Organic Compounds
- Synthesis and Biological Evaluation
- Synthesis of heterocyclic compounds
- Fluorine in Organic Chemistry
- Agricultural and Food Sciences
- Heavy metals in environment
- Lignin and Wood Chemistry
- Synthesis and biological activity
- Wood Treatment and Properties
- Water Quality and Pollution Assessment
- Allelopathy and phytotoxic interactions
- Chromium effects and bioremediation
- Wood and Agarwood Research
- Wastewater Treatment and Reuse
- Plant-Derived Bioactive Compounds
- Weed Control and Herbicide Applications
- Analytical chemistry methods development
- Electrokinetic Soil Remediation Techniques
- Enzyme-mediated dye degradation
- Synthesis and Characterization of Heterocyclic Compounds
- Geochemistry and Geologic Mapping
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Phytochemistry Medicinal Plant Applications
- Heavy Metals in Plants
- Natural Fiber Reinforced Composites
Universidade Federal de Santa Maria
2013-2025
High toxicity of the preservatives most frequently used in wood treatment and resulting risks handling pose a threat to small producers environment. In an attempt mitigate these problems, present study was conducted with objective evaluating preservative effect tannic extract on biodeterioration Acacia mearnsii wood. For this purpose, untreated preserved specimens, some tannin mixture based CCB (Chromated Copper Borate), were submitted accelerated rotting trials fungus that causes white rot...
ABSTRACT Models for assessing sediment quality describe the occurrence of a continuous matter and energy exchange process at sediment–water interface, displacement nutrients metals from sediments to water column affecting its quality. Although these models are highly used studying reservoirs lakes, there is gap between them regarding assessment rivers in heavily urbanized areas without access basic sanitation, where high loads untreated effluents domestic industrial sources arrive. This work...
Além das avaliações entre genótipos, a utilização de técnicas multivariadas possibilita restringirem-se os erros, principalmente quanto à diversidade genética, podendo-se, assim, prever combinações com maior efeito heterótico, além da possibilidade recuperação dos genótipos superiores. Objetivou-se, este trabalho, avaliar divergência genética 18 cultivares soja, por meio seis caracteres morfoagronômicos. Foi realizada análise trilha, para averiguar as contribuições direta e indireta desses...
DISPERSIVE X-RAY FLUORESCENCE SPECTROMETRY (EDXRF).This study aimed to evaluate the chemical elements levels in soil, submitted different management systems and use by Energy Dispersive X-Ray Fluorescence Spectrometry -EDXRF.The were T1 -agro forestry (SAF), T2 -Native Field (CN), T3 Forest (NM), T4 -Tillage (PF); T5 -conventional tillage system (SPC) T6 -System (NT).Samples collected at 0-10 10-20 cm, dried ground for analysis EDX-720.The soil showed no difference average concentrations of...
Abstract The synthesis and isolation of the intermediates N ‐[1‐aryl(alkyl)‐3‐oxo‐4,4,4‐trichloro‐1‐buten‐1‐yl]‐ o ‐phenylenediamines 2a‐f corresponding 2‐trichloromethyl‐4‐aryl‐3 H ‐1,5‐benzodiazepines 3c‐g or benzimidazoles 4a‐b derivatives obtained from intramolecular cyclization direct cyclo‐condensation reaction β‐alkoxyvinyl trichloromethyl ketones 1a‐g with ‐phenylenediamine, is reported. Depending structure ‐[1‐aryl(alkyl)‐3‐oxo‐4,4,4‐trichloro‐buten‐1‐yl]‐ reactions conditions, 3...
A series of twelve 5-bromo[5,5-dibromo]-4-methoxy-1,1,1-trihalo-3-alken-2-ones 5a-d, 6a-d, 7a, 9a, 10a and 6-bromo-5-methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one (8a) were synthesized in high purity good yields (70-95%) by the regiospecific allylic bromination 4-methoxy-1,1,1-trihalo-3-alken-2-ones 1a-d, 2a-d, 3a or 5-methoxy-1,1,1,2,2-pentafluoro-4-hexen-2-one (4a), respectively, with bromine followed addition pyridine. The usefulness compounds 5-10 heterocyclic synthesis is also reported.
A convenient and general method for the regiospecific synthesis of three novel series 1-(2-thenoyl)-, 1-(2-furoyl)- 1-(isonicotinoyl)-3-alkyl(aryl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-pyrazoles, in good yields (53 – 91 %), from cyclocondensation reactions 1,1,1-trifluoro-4-alkoxy-4-alkyl(aryl)-but-3-en-2-ones, where alkyl = H Me; aryl -C6H5, 4-CH3C6H4, 4-CH3OC6H4, 4-FC6H4, 4-ClC6H4, 4-BrC6H4, 4-NO2CgH4 with 2-thiophenecarboxylic hydrazide, furoic hydrazide isonicotinic acid...
Abstract magnified image A new, efficient and easy route for the preparation of a series 2‐alkyl(aryl) substituted 4‐oxo‐4 H ‐pyrido‐[1,2‐ ]pyrimidines, where alkyl = CH 3 ; aryl C 6 5 , 4‐FC 4 4‐ClC 4‐BrC 4‐CH 4‐OCH 4‐NO 2 in 45–80 % yield from reaction β‐alkoxyvinyl trichloromethyl ketones with 2‐aminopyridine under mild conditions, is then reported.
Abstract A convenient method for the synthesis of alkyl[aryl]-substituted 5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-methylpyrazole (2) from a new ring transformation reaction alkyl[aryl]-substituted-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-pyrazolethiocarboxyamide (1) with methylhydrazine in THF, and thermal dehydration 2, are reported.
Sediments are active environmental compartments capable of interchanging the chemical species with water column, degrading their quality and influencing toxicity matrix. The average concentrations sediment-associated metallic have been used to evaluate extent contamination. approaches progressed considerably over last few decades different instrumental techniques employed in quali-quantification metal compounds associated sediments. This study aimed accuracy technique Energy Dispersive X-Ray...
A convenient method for the synthesis of a novel series eighteen non-condensed 5,5-bicycles, specifically 2-[3-alkyl(phenyl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-pyrazol-1-yl]-4-phenyl-5-alkylthiazoles and -4,5,6,7-tetrahydrobenzothiazoles 3a-i from reaction 3-alkyl(phenyl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-1-pyrazolethiocarboxyamide (1) with 2-bromoacetophenone, 2-bromopropiophenone 2-bromocyclohexanone (2), is reported. The dehydration compounds mixture concentrated sulfuric...
Secondary compounds produced by plants are considered an alternative method of weed suppression but can cause negative effects on crops in succession, especially a no-tillage system, due to the degradation crop residues with allelopathic potential. The objective this work was analyze influence foliar aqueous extracts Brassica napus germination and initial development seedlings Phaseolus vulgaris. extract prepared as stock 10 % weight/volume solution, diluted into treatments relative...
An effective analytical method for pesticides multiresidue determination in grape samples was developed and validated.A modified quick, easy, cheap, effective, robust safe (QuEChERS) used to extract the target compounds.Several sorbent materials were tested clean-up step using dispersive solid phase extraction (d-SPE) Florisil ® selected.Samples extracts evaporated before injection gas chromatography with mass spectrometry (GC-MS) system order improve detectability.Recoveries from blank...
This research aimed to qualify and quantify physical, chemical, microbiological emerging environmental contaminants, pharmaceuticals pesticides in spring waters, which are used for human consumption under different land use occupation conditions. These conditions were: native forests swine farming, as well soy tobacco crops two consecutive seasons. Due the variables pH apparent color, water studied is not potable, it does comply with legislation due contribution of total coliforms found...
The objective of this study was to evaluate the effect a foliar fungicide commonly used control Asian soybean rust (Phakopsora pachyrhizi) in physiological and sanitary quality seeds. experiment carried out during 2012/13 field season, with six treatments four replications arranged randomized complete block design. following were evaluated: T1 (no application); one application at R1 stage; two applications R3 stages; three R1, R3, R5 R5, R6 stages five R7 stages. Seeds yield, seed weight,...
Objetivou-se com este estudo avaliar, por meio de caracteres quantitativos, a dissimilaridade genética entre cultivares girassol em diferentes localidades, além da concordância os métodos, visando à extração linhagens para possíveis cruzamentos. Foram cultivados oito híbridos duas localidades no noroeste do Rio Grande Sul, solo predominantemente tipo Latossolo Vermelho distrófico. utilizados métodos multivariados determinar divergência genética, utilizando distância generalizada Mahalanobis....
Há variações nas composições químicas, físicas e na anatomia da madeira, entre espécies também dentro mesma espécie, as quais variam significativamente com a altura do tronco direção medula até casca. O objetivo presente trabalho foi analisar composição química madeira de Cordia trichotoma. Foram analisadas três árvores, coletadas Região Noroeste Estado Rio Grande Sul, das retirado um disco localizado próximo base. Quantificou-se o teor cinzas extrativos pela norma TAPPI óleo essencial...