Search results

Search:
in the keywords: Nitric oxide

Sort By:

Limit search:

Asymmetric and symmetric dimethylarginine in patients presenting with risk factors for coronary heart disease

100%

Ilic M., Pavlovic R., Lazarevic G., Cvetkovic T., Kocic G., Ilic S., Stefanovic V.

Open Medicine

2012

vol. 7

issue 5

659-664

The aim of the present study was to investigate asymmetric (ADMA) and symmetric dimethylarginine (SDMA) production in patients presenting with one or more risk factor (RF) for coronary heart disease (CHD). Patients and methods: Overall, 113 participants were enrolled in the study, including 45 patients presenting with risk for CHD (27 male and 18 female; aged 55.9 ± 6.4 years), 30 sex and age-matched middle-aged healthy controls (16 male and 14 female; aged 56.3 ± 8.4 years), and 38 young healthy controls (38 male; aged 24.6 ± 3.9 years). Results: No significant differences for ADMA and SDMA were recorded between patients groups presenting with risk for CHD. However, ADMA and SDMA were significantly higher in all examined patient groups (≥3 and 1–2 RF, hypertensive and non-hypertensive, obese and non-obese, diabetics and non-diabetics) compared with both control groups (middle-aged and young controls) (p<0.001). ADMA significantly correlated with SDMA in ≥3 RF (p<0.05), hypertensive (p<0.05), non-obese (p<0.05), non-diabetics (p<0.01), as well in middle-aged (p<0.05) and young controls (p<0.001). Conclusion: Significantly higher ADMA and SDMA were found between patients presenting with risk for CHD (≥3 and 1–2 RF, hypertensive and nonhypertensive, obese and non-obese, diabetics and non-diabetics) and healthy, middle-aged and young controls. ADMA significantly correlated with SDMA in ≥3 RF, hypertensive, non-obese and non-diabetic patients, as well as in middle-aged and young controls.

The effect of anatase crystal morphology on the photocatalytic conversion of NO by TiO2-based nanomaterials

88%

Abreu M., Morgado E., Jardim P., Marinkovic B.

Open Chemistry

2012

vol. 10

issue 4

1183-1198

Hydrogen titanate nanotubes (H-TTNT) were synthesized by the alkali hydrothermal method followed by proton exchange and then submitted either to thermal treatment or to acid hydrothermal reaction to generate TiO2-anatase nanocrystals of different morphologies. The samples were characterized by XRPD, TGA, sulfur analysis, N2 physisorption, UV-Vis spectroscopy and TEM. Their photocatalytic activities were determined by measuring the NO conversion in inert gas stream passed through the powder catalyst bed under UV radiation. Incomplete transformation into anatase resulted in nanomaterials with low activity due to coexistence with H-TTNT or TiO2-B precursors. Anatase specimens derived from H-TTNT aged in strong sulfuric acid media contained equidimensional nanoparticles, but retention of sulfate negatively affected their photocatalytic activity. Combining milder acidic pH with higher aging temperature, allowed synthesis of a sulfate free anatase with the same optical properties and specific surface area as the counterpart produced by calcination of H-TTNT at 550°C; however, the former exhibited truncated bi-pyramid nanocrystals and the other adopted the form of nanorods. This latter showed the highest photocatalytic activity for NO abatement, outperforming the benchmark photocatatyst TiO2-P25; this improved activity was tentatively ascribed to the maximization of high energy {001} facets in anatase nanorods formed during calcination of H-TTNT. [...]

Refine search results

1 Open Chemistry

1 Open Medicine

2 2012

1 Abreu M.

1 Cvetkovic T.

1 Ilic M.

1 Ilic S.

1 Jardim P.

1 Kocic G.

1 Lazarevic G.

1 Marinkovic B.

1 Morgado E.

1 Pavlovic R.

1 Stefanovic V.

Search results

Asymmetric and symmetric dimethylarginine in patients presenting with risk factors for coronary heart disease

The effect of anatase crystal morphology on the photocatalytic conversion of NO by TiO2-based nanomaterials