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Results for “RESPIRATORY SYSTEM”

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At least 811 records · Page 45Linked to original sources
PubMed1976

The branched respiratory system of photosynthetically grown Rhodopseudomonas capsulata.

Various respiratory electron transport activities of Rhodopseudomonas capsulata were studied in membrane fragments prepared from photosynthetically grown cells of a parental strain and two terminal oxidase-defective mutant strains. The NADH and succinate oxidase activities of the mutant having a functional N,N,N1,N1-tetramethyl-p-phenylenediamine oxidase, M6, were consideraly more sensitive to inhibition by either antimycin A or cyanide than the corresponding activities of the mutant lacking a functional N,N,N1,N1-tetramethyl-p-phenylenediamine oxidase, M7. The parental strain, Z-1, but not the mutants, showed biphasic inhibitory responses of NADH and succinate oxidase activities with either antimycin A or cyanide. In certain reactions no differences in inhibitor susceptibility were found among the strains tested, implying that the pathways involved were unaffected in the mutants. In this category were the actions of rotenone on NADH oxidase, antimycin A on cytochrome c reductase and, in M6 and Z-1, cyanide on N,N,N'N'-tetramethyl-p-phenylenediamine oxidase. These results suggest that the respiratory chain of the parental strain branches at the ubiquinone-cytochrome b region into two pathways, each branch goes to a distinct terminal oxidase, and either may be blocked independently by genetic mutation.

Antimycin A↗
PubMed1999

The comparison of respiratory resistance and occlusion pressure in alcohol dependent patients who complain or not of the respiratory system disorders.

Alcohol abusers often complain of respiratory symptoms. The aim of the study was to analyse the respiratory pattern parameters and occlusion pressure in chronic alcoholics who complained of respiratory symptoms vs. those who did not suffer from any symptoms before the admission. Also dynamics in changes of spirometry parameters and respiratory pattern parameters during controlled, absolute abstinence while hospitalisation in the Detoxification Unit of the Department of Clinical Toxicology was evaluated. There were 124 study patients: 84 ethanol dependent patients and 40 healthy subject not dependent on ethanol (control group). Ethanol dependency was diagnosed using ICD-10 criteria. The questionnaire according to Fletcher was gathered for each of the subject. The positive results of Fletcher questionnaire (chronic cough + chronic expectoration) was obtained in 43 of the ethanol abusers-group I. The rest of abusers who did not complain of any respiratory symptoms was included to the group II. Respiratory tract resistance was significant the differential factor between the patients with positive results of Fletcher questionnaire and patients who did not suffer any symptoms before admission. Significant differences in occlusion pressure values, were noted between the group of abusers with and without the respiratory symptoms both in the first and control examination.

Adult↗
PubMed2004

[Functional state of respiratory system among coal miners].

The study covered respiratory function in apparently healthy coal miners varying in length of service. Findings were three stages of adaptation: satisfactory (length of service--15 years); boundary, with primary functional strain of bronchi and lungs (length of service--16-20 years); unsatisfactory, with secondary functional strain of bronchi and lungs (length of service over 20 years).

Adult↗
PubMed1993

[Transitional modes in the work of the external respiratory system under physical loading].

When recording the respiratory volume (RV) in the course of a 5-minute muscular work, two types of transitory processes were revealed: an aperiodic and an oscillatory ones. The former characterises the matrix optimal way of adaptation to physical work. The latter occurs of loads in a moderate intensity. The RV fluctuations seem to reflect a "search" for the RV optimal level for a given lung ventilation. The reserve volume of expiration practically does not participate in the RV increase, thus maintaining a large enough functional residual capacity in physical load.

Adolescent↗