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Respiratory Transport (1)
Articles on Respiratory Transport
[Studies of the blood antioxidant system and oxygen-transporting properties of human erythrocytes during 105-day isolation].
Effects of strict 105-d isolation on blood antioxidant status, erythrocyte membrane processes and oxygen-binding properties of hemoglobin were studied in 6 male volunteers (25 to 40 y.o.) in ground-based simulation of a mission to Mars (experiment Mars-105). The parameters were measu...
Intra-individual variation allows an explicit test of the hygric hypothesis for discontinuous gas exchange in insects.
The hygric hypothesis postulates that insect discontinuous gas exchange cycles (DGCs) are an adaptation that reduces respiratory water loss (RWL), but evidence is lacking for reduction of water loss by insects expressing DGCs under normal ecological conditions. Larvae of Erynnis prop...
BOLD contrast and noise characteristics of densely sampled multi-echo fMRI data.
Blood oxygenation level dependent (BOLD) contrast in functional MRI (fMRI) can be enhanced using multi-echo imaging and post-processing techniques that combine the echoes in weighted summation. Here, existing echo-weighting methods are reassessed in the context of an explicit physiol...
Ionic support of the cough reflex.
The aim of this study was to determine the role ofintra-wall nervous and neurohormonal system in the control of airway transport of sodium and chloride ions, as well as to identify regulating mechanisms having an effect on the permanent electric potential of airway tissue, named the transepithelial...
Modeling airflow and particle transport/deposition in pulmonary airways
Gas and aerosol mixing in the acinus.
Correlated patterns of tracheal compression and convective gas exchange in a carabid beetle.
We used flow-through respirometry and synchrotron x-ray phase-contrast imaging to simultaneously record CO(2) emission and observe morphological changes in the major tracheae. Each observed tracheal compression (which occurred at a mean frequency and duration of 15.6+/-4.2 min(-1) and 2.5+/-0.8 s, r...
Physiological determinants of the pulmonary filtration coefficient.
We have observed a remarkable consistency of the normalized baseline K(f) values between species with widely varying body weights from mice to sheep. Uniformity of K(f) values can be attributed to the thin alveolar capillary barrier required for gas exchange and the conserved matching of lung vascul...
Effects of warm-up intensity on oxygen transport during supramaximal exercise in horses.
The VO(2) was significantly higher in HiWU and MoWU than in NoWU throughout the sprint exercise period. Blood lactate accumulation rate in the first 60 seconds was significantly lower in MoWU and HiWU than in NoWU. Specific cardiac output after 60 seconds of sprint exercise was not significantly dif...
Breathe softly, beetle: Continuous gas exchange, water loss and the role of the subelytral space in the tenebrionid beetle, Eleodes obscura
We measured abdominal movements within the subelytral cavity, and the activity of the pygidial cleft (which seals or unseals the subelytral cavity), simultaneously with total CO2 release rate and water loss rate. First, we found that E. obscura has the lowest cuticular permeability measured in flow-...