Banca de DEFESA: LEOMIR AIRES SILVA DE LIMA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LEOMIR AIRES SILVA DE LIMA
DATA : 16/03/2018
HORA: 14:00
LOCAL: Auditório do química 3
TÍTULO:

APPLICATION OF DIFFERENT INSTRUMENTAL TECHNIQUES AND CHEMOMETRIC TOOLS IN COMPLEX BIOLOGICAL SYSTEMS

PALAVRAS-CHAVES:

Fluorescence. ATR-FTIR. NIR. Sarcopenia. Voltammetry. Entomotoxicology. Multivariate analysis

PÁGINAS: 112
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Métodos Óticos de Análise
RESUMO:

This thesis demonstrates the application of instrumental techniques such as: near and medium infrared spectroscopy, molecular fluorescence and differential pulse voltammetry, combined with multivariate classification and variable selection techniques applied to biological system such as tissue, fly larvae and blood plasma . In a first study, NIR spectroscopy was used to obtain healthy and critically defective rat skull spectra. Multivariate classification models were constructed, aiming at an alternative methodology to estimate the success rate of bone repair through low intensity laser and collagen treatments. The algorithms PCA-LDA, SPA-LDA and GA-LDA were applied as classification tools and their comparative performances. In general, the NIR spectra were able to classify the control group of the others showing efficiency in the evaluation of wound healing in rat cranial defect. In a second study, ATR-FTIR spectroscopy was used to obtain blood plasma spectra of healthy elderly patients with sarcopenia. Multivariate classification models were constructed, aiming at a diagnostic methodology for screening of sarcopenic elderly. The algorithms PCA-LDA, SPA-LDA and GA-LDA were applied as classification tools and their comparative performances. In general, the results obtained through the SPA-LDA and GA-LDA variable selection algorithm were the most satisfactory, since they could be related to functional groups belonging to different biomolecules and possible biomarkers. In a third study, differential pulse voltammetry and molecular fluorescence excitation / emission matrices were obtained for extracts of control fly larvae and containing the drug flunitrazepam. The performance of the classification algorithms with linear and quadratic discriminant and linear discriminant functions for voltammograms and the 2D-LDA algorithm compared to PARAFAC-LDA were evaluated for classification among the groups investigated. Hit rates above 90% were obtained for the control and flunitrazepam classes. The results suggest that spectroscopic and electrochemical methods added to the multivariate analysis are capable of undermining relevant information about the understanding of the biological dynamics of several organisms, as well as contributing to the public health system in the identification of sarcopenia in the elderly.

MEMBROS DA BANCA:
Presidente - 1714946 - KASSIO MICHELL GOMES DE LIMA
Interno - 1803692 - FABRICIO GAVA MENEZES
Externo ao Programa - 1715271 - RENATA ANTONACI GAMA
Externo à Instituição - EDVAN CIRINO DA SILVA - UFPB
Externo à Instituição - SHERLAN GUIMARÃES LEMOS - UFPB