Cotton induced bronchoconstriction detected by a forced random noise oscillator.
نویسندگان
چکیده
منابع مشابه
Cotton induced bronchoconstriction detected by a forced random noise oscillator.
Lung function responses to inhaled cotton dust were evaluated in a group of 58 healthy subjects by spirometry (MEFV curves) and forced random noise impedance parameters. Twenty-one of these subjects were also examined by body plethysmography to assess changes in airway resistance (Raw). For the study group as a whole, alterations in lung mechanical function after exposure to cotton dust were de...
متن کاملNoise-induced Effects on a Nonlinear Oscillator
We examine various phenomena induced by white Gaussian random perturbations in the response of nonlinear dynamical systems. In the rst part of this work, digital and analog experiments are conducted on a simple single-degree-of-freedom oscillator with piecewise linear restoring force and harmonic forcing. They reveal that small noise perturbations can give rise to large deviations of the respon...
متن کاملForced random noise resistance determination in childhood asthma.
The forced random noise method for measuring respiratory resistance was studied in terms of reproducibility and correlation with spirometry and flow volumes in 30 older children (four to 17 years) with asthma and in 16 infants and children below three years of age. In the 30 older children, the mean value of individual coefficient of variations for three repeated measurements was 7.4 percent. R...
متن کاملcadmium-induced genotoxicity detected by the random amplification of polymorphism dna in the maize seedling roots
in recent years, several plant species have been used as bioindicators, and several tests have been developed to evaluate the toxicity of the environmental contaminants. in this study, the root length and dna band pattern of root tips in maize (zea mays l.) seedlings were exposed at different concentration of cadmium pollutant (40 and 80 mg l−1). the results indicated that the root length of ma...
متن کاملAttenuation of propranolol-induced bronchoconstriction by frusemide.
BACKGROUND Inhaled propranolol causes bronchoconstriction in asthmatic subjects by an indirect mechanism which remains unclear. Inhaled frusemide has been shown to attenuate a number of indirectly acting bronchoconstrictor challenges. The aim of this study was to investigate whether frusemide could protect against propranolol-induced bronchoconstriction in patients with stable mild asthma. ME...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Occupational and Environmental Medicine
سال: 1984
ISSN: 1351-0711
DOI: 10.1136/oem.41.4.480