Search results for "Human physiology"

Elektrophysiologische Untersuchung der einzelnen Faseranteile des isolierten Rattenzwerchfelles

1957

Die Aufnahme von Methylsulfat-Ionen in die Vorhofsmuskulatur von Meerschweinchen

1963

The uptake of methylsulfate ions by isolated guinea pig atria and auricles has been studied.

Autoradiographic technique to assess distribution of blood flow within organs

1969

A method is described for assessing the distribution of blood flow within organs. Microspheres, 5–50 μ in diameter, labelled with a beta-emitting isotope were injected into the left ventricle of experimental animals. The distribution of the indicator within the tissues, which is assumed to represent the regional distribution of flow, was visualized and measured quantitatively by autoradiography. Local flow rates in areas of about 1,2 mm in diameter could be determined. Application of the technique for the study of regional myocardial and renal circulation is demonstrated.

A new equipment to measure time quantities

1982

Inspiratory inhibition and rebound activation elicited by intermittent electrical bulbar stimulation in various states of pulmonary afferent vagal ex…

1975

In anesthetized rabbits spirogram and diaphragmatic activity were examined during electrical stimulation of regions of the medulla oblongata. The volleys were triggered by the animal's own respiration. 1. One volley of 120 msec duration at 100 pulses p.s., applied during inspiratory, caused an immediate and transient inhibition of the diaphragmatic activity. After the end of the volley and inspiratory rebound appeared: the tidal volume was increased and the inspiration was prolonged by some 150 msec. The respiratory rate decreased. 2. Continuous low or high frequency electrical stimulation of pulmonary stretch afferents caused an inspiratory or an expiratory effect respectively. In both con…

Relative Koordination der Lymphherzbewegungen bei Anuren

1966

1. Die Registrierung der Pulsrhythmen der coccygealen Lymphherzen von Rana temporaria, R. esculenta, R. ridibunda, Bufo bufo, B. calamita und B. viridis ergab gattungstypische Unterschiede.

Versuche zur Bestimmung des wahren K-Efflux im Rattenzwerchfell

1960

In an isolated muscle loaded with 42K the potassium efflux through the muscle fibre membrane can be calculated from the rate constant of the loss of 42K into an inactive bathing solution. The calculation can only be valid if the amount of 42K leaving all the individual fibres is equivalent to the amount of 42K entering the bathing solution from the surface of the whole muscle. It seems possible that 42K ions which have already left a muscle cell can be taken up again into a muscle fibre before diffusing into the bathing solution. Thus the calculated potassium efflux might be smaller than the real efflux.

Estimation of isometric strength: Intensity and holding time

1982

Pathogens and host immunity in the ancient human oral cavity.

2014

Calcified dental plaque (dental calculus) preserves for millennia and entraps biomolecules from all domains of life and viruses. We report the first high-resolution taxonomic and protein functional characterization of the ancient oral microbiome and demonstrate that the oral cavity has long served as a reservoir for bacteria implicated in both local and systemic disease. We characterize: (i) the ancient oral microbiome in a diseased state, (ii) 40 opportunistic pathogens, (iii) the first evidence of ancient human-associated putative antibiotic resistance genes, (iv) a genome reconstruction of the periodontal pathogen Tannerella forsythia, (v) 239 bacterial and 43 human proteins, allowing co…

Ein unabh�ngiges Verfahren zur Messung der Zusammensetzung von Gasgemischen mit Hilfe der Gaschromatographie

1977

The volume fraction of gas mixtures may be measured gas chromatographically by application of the 100% method, provided they can be separated. In case of gases it is not necessary to calibrate with another method. The specific character of the detector signals can be eliminated by measurements with pure components. The procedure is compared with the Scholander method. In case of O2/N2 mixtures the results agree within reproducibility, but in case of O2/CO2/N2 mixtures a systematic deviation of the CO2 fractions to smaller values is found as concerns the Scholander method. A gas mixture with 5.6 Vol% CO2 shows a difference of approximately 0.3 Vol%. The gas chromatographic method is almost 1…