Effect of ipratropium bromide in bronchial asthma.

The effect of inhalation of ipratropium bromide was evaluated in 20 patients with bronchial asthma. It was observed that there was no significant improvement in the forced vital capacity and the forced expired volume in one second, while there was significant improvement in the peak expiratory flow rate (PEFR) measured at 9 pm, after inhalation of 2 puffs of ipratropium bromide aerosol (0.02mg/puff) three to four times a day for 2 weeks. Since PEFR is a measure of large airway function and cholinergic mechanisms are primarily involved for airflow obstruction at large airways, improvement in PEFR by ipratropium bromide highlights its role as a useful bronchodilator in patients in whom vagal reflexes are responsible for the provocation of bronchoconstriction

Turbulence structure in bubble disengagement zone: role of polymer addition

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Chemical beam epitaxy grown AlGaNAs for photovoltaic applications

International audienc

Criteria for the transition from the homogeneous to the heterogeneous regime in two-dimensional bubble column reactors

Criteria have been developed for the prediction of the transition from the homogeneous to the heterogeneous regime in two-dimensional bubble columns. The theory of linear stability has been used for this purpose. Semibatch and continuous modes of operation have been analysed. The effects of sparger design, column height and the liquid phase physical properties have been investigated. A comparison between model predictions and experimental observations has been presented

Chemical beam epitaxy grown AlGaNAs for photovoltaic applications

International audienc