The kinetics and mechanism of ether and alkanol cleavage reactions on Brønsted acid catalysts based on polyoxometalate (POM) clusters are described in terms of the identity and dynamics of elementary steps and the stability of the transition states involved. Measured rates and theoretical calculations show that the energies of cationic transition states and intermediates depend on the propertie...

Background and Aims: This study aims to identify the level of motivation among blood donors and their intention to donate again and suggest remedial measures to rectify de-motivating influences. Materials and Methods: A self-administered questionnaire was distributed among donors to collect data on variables related to the objective. Results: Most donors were men aged 18-24 years, graduates, ...

results there were 64 women and 936 men in the population under study. the mean ± sd age of the donors was 38 ± 11 years. 80 out of 1000 samples (8%) were found to be positive for hbcab. hbv dna was detected in 50% of hbcab positive specimens. the mean ± sd age of donors without hbv dna was 37.7 ± 10.5 years and for donors with hbv dna was 40.9 ± 11.2 years (p = 0.05). objectives the aim of thi...

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background: in radiation treatment of moving targets located in thorax region of patient body, the delivered dose does not match with the planned treatment, resulting in some over and under dosage in the tumor volume, as a function of motion magnitude and frequency. several efforts have been done to investigate the target motion effects on dose distribution in the target and surrounding normal ...

background hepatitis a virus (hav) and hepatitis e virus (hev) are both transmitted by the fecal-oral route and are known as the leading causes of acute viral hepatitis in the world, especially in developing countries. there is a lack of updated data on hav and hev seroprevalence in iran. objectives the aim of this study was to determine the seroprevalence of hav and hev among a group of blood ...