Demir ve Alüminyumun Doğal Sularda UV Spektrofotometrik Tayini İçin Yöntem Geliştirilmesi ve Elde Edilen Verilerin Kemometrik Kalibrasyon Yöntemleriyle Değerlendirilmesi

In this study, principal component analysis method (PCA), principal component regression method (PCR), partial least squares method (PLS) of chemometry calibration methods, are successfully realized on quantitation of Fe³⁺ and Al³⁺ present at natural water. The data gathered from UV- Visible Spectroscopy are evaluated chemometrically. In the application two distinctive ligand chrome azurol S (CAS) and pyrocatechol violet (PCV) are tested and studies are proceeded with CAS due to more stable results that are obtained. Optimum parameters (ligand amount, pH, waiting period, relation between metal concentration and absorbance, foreign ion effect) and conditions of Fe³⁺ and Al³⁺ CAS and their complexes are determined with spectrophotometric methods. After the optimum conditions are provided, spectrophotometric determinations of natural water including Fe³⁺ and Al³⁺ are realized and obtained data are evaluated as chemometr

Analysis of physical activity intensity, alexithymia, and the COMT val 158 met gene polymorphism

The researchers investigated the relationship between intense training, the catechol-Omethyltransferase (COMT) Val108/158Met gene polymorphism, and alexithymia. Eighteen female and 77 male athletes were included. The Toronto Alexithymia Scale (TAS) questionnaire and polymerase chain reaction method were used to evaluate alexithymia and the COMT gene Val108/158Met polymorphism, respectively. Fifteen (15.8%) subjects were evaluated as alexithymic and 80 (84.2%) were non-alexithymic according to the TAS. The COMT Vall08/158 Met gene polymorphism frequencies were as follows: 17.9% Met/Met, 50.5% Val/Met, and 31.6% Val/Val. No difference were observed among training intensity, the COMT Vall08/158 Met gene polymorphism, and alexithymia(p > 0.05). However, 60% of the alexithymic subjects trained intensively and only 6.7% trained lightly. Intensive and light training rates for non-alexithymic athletes were 46.3% and 20%, respectively. The Val/ Val and Met/Met genotyping rates for athletes engaged in intensive training were 32.6% and 29.3%. In conclusion, no significant relationship was observed among TAS scores, the COMT gene polymorphism, and training intensity. © Kamla-Raj 2014