A5060141458- Analytical chemistry methods development
- Heavy metals in environment
- Inorganic and Organometallic Chemistry
- Photochemistry and Electron Transfer Studies
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Molecular Junctions and Nanostructures
- Radical Photochemical Reactions
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Insect and Arachnid Ecology and Behavior
- Various Chemistry Research Topics
- Electrochemical Analysis and Applications
- Plant and animal studies
- Organic Chemistry Cycloaddition Reactions
- Polar Research and Ecology
- Mass Spectrometry Techniques and Applications
- Heavy Metals in Plants
- Arsenic contamination and mitigation
- Radioactivity and Radon Measurements
- Crystallography and molecular interactions
- Radiation Detection and Scintillator Technologies
- Plant Micronutrient Interactions and Effects
- Free Radicals and Antioxidants
- Particle Detector Development and Performance
Universidade Federal de Lavras
2019-2024
Black Hills State University
2017-2021
Universidade de São Paulo
2012-2017
Forest Science and Research Institute
2015
Methodist University of Piracicaba
2015
Universidade Federal de Viçosa
2006-2014
Universidade Federal de São Carlos
2011-2012
Hampshire College
2011
University of Bologna
1973-2010
Fundação de Amparo à Pesquisa do Estado de Minas Gerais
2007
Review of recent developments in quantitative analysis and microchemical imaging plants by LIBS XRF.
Handheld and benchtop EDXRF systems presented similar analytical performances with pellets of plant materials aiming at nutrition diagnosis.
We evaluated the new on site soil conditions and their potential risks immediately after a fire that completely destroyed Brazilian Antarctic Station, February 2012. The investigated variables were concentration of potentially toxic elements (Cd, Cr, Cu, Mn, Ni, Pb, V Zn) in samples collected close to station inside burnt station's ruins. Soil 4 years before used as reference for comparative purposes. Principal Component Analysis (PCA) μ-X-Ray Fluorescence preliminary tools provide fast...
A novel strategy for direct analysis of dried leaves by EDXRF and LIBS aiming at plant nutrition diagnosis.
Verbena officinalis L. is used in folk medicine for the treatment of inflammatory disorders, skin burns, abrasions, and gastric diseases. Extracts obtained with different solvents (methanol, VoME; enriched flavonoids, VoEF; supercritical CO2, VoCO2) were evaluated anti-inflammatory, gastroprotective cicatrizing activities. Additionally, antioxidant capacity was determined vitro. In order to confirm activities investigated, histological observations performed. All extracts induce a remarkable...
The combined use of internal standardization with collision and reaction interface in an inductively coupled plasma quadrupole mass spectrometer (ICP-QMS-CRI) was evaluated. behavior several elements (Ba, Cd, Co, Cr, Cu, Li, Mn, Mo, Pb, Sb, V Zn) studied by introducing H(2) or He through the skimmer sampler cones CRI device using In, Rh Sc as standards. Certified reference material trace water (NIST 1643e) used to evaluate performance method. A vinegar sample mixed food diet standard were...
An analytical procedure relying on micro-energy dispersive X-ray fluorescence spectrometry (μ-EDX) was evaluated for the quantitative determination of macro-, micronutrients and beneficial elements in pressed pellets plant materials. For testing purposes, leaves from 23 varieties sugar cane, previously analyzed by validated reference methods, based wet decomposition procedures followed ICP OES measurements were used. Linear correlations between analyte mass fractions tested samples...
μ-EDXRF is a strong analytical tool enabling the simultaneous mapping of As and P in As-hyperaccumulator fern <italic>Pityrogramma calomelanos</italic>.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical approaches to the optical absorption spectra of sulfonyl radicalsC. Chatgilialoglu, D. Griller, M. GuerraCite this: J. Phys. Chem. 1987, 91, 14, 3747–3750Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://doi.org/10.1021/j100298a007RIGHTS & PERMISSIONSArticle Views206Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are COUNTER-compliant sum...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative nonempirical estimates of the effects orbital interactions. Applications to difluoroethylenesF. Bernardi, A. Bottoni, N. D. Epiotis, and M. GuerraCite this: J. Am. Chem. Soc. 1978, 100, 19, 6018–6022Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://doi.org/10.1021/ja00487a007RIGHTS & PERMISSIONSArticle Views67Altmetric-Citations35LEARN ABOUT THESE...
Summary This study aimed to evaluate the efficacy of piroxicam associated with low‐level laser therapy compared single therapies in 32 patients presenting temporomandibular joint arthralgia a random and double‐blind research design. The sample, divided into + piroxicam, placebo groups, was submitted treatment infrared (830 nm, 100 mW , 28 s, J cm −2 ) at 10 muscle points on each side during four sessions concomitant take one capsule day 20 mg days. evaluated throughout 30 days follow‐up...
In this study, we proposed a straightforward approach that could be used for Cr redox speciation in soil samples from remote places. For aim, under strong anthropogenic impact, the vicinity of Brazilian Antarctic Station were studied. Control with no direct also collected further (4 km) station. A preliminary laboratory evaluation (VI) presence was performed using X-ray absorption spectroscopy. The method based on hot alkaline extraction to promote quantitative samples. colorimetric reagent...