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Results for “CAPILLARITY”

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At least 181 records · Page 10Linked to original sources
PubMed1977

Fluid absorption and capillarity of suture materials.

The fluid absorption and capillarity of different suture materials commonly used were investigated in saline and blood plasma. Linen and silk have high fluid absorption in plasma (92.2 +/- 1.3%, 65.2 +/- 0.7% of dry weight), and polyamide twisted with cover together with polyester considerably lower absorption (27.0 +/- 0.8%, 16.0 +/- 0.3%). Monofilament polyamide has fluid absorption ability in spite of its homogeneous structure (10.1 +/- 0.2%). Capillary properties were demonstrated in all multifilament synthetic and natural materials but were effectively eliminated by waxing treatment. The fluid transport rate constant varied considerably between different materials and was highest for polyamide with cover. Fluid absorption and capillary properties are presumed to be of significance for the impact of contaminating bacteria.

Absorption↗
PubMed1976

The mechanism of capillarity in surgical dressings.

By appreciating the concept of capillarity and by determining whether or not the dressing to be used next to the wound should be hydrophilic or hydrophobic, a dressing can be designed that acts to remove secretions from a draining wound. It also may protect a wound from exogenous secretions.

Bandages↗
PubMedDate not supplied

[Capillarization of the muscular tissue of the Black Sea dolphin Phocaena phocaena].

Studies have been made on morphological and diffusion parameters of capillaries in cardiac and skeletal muscles of the dolphin P. phocaena. As compared to that in terrestrial mammals, the degree of capillarization of muscle tissue in the dolphin was found to be higher. Higher density of capillaries, as well as shorter radii of diffusion and smaller volumes of tissue cylinders, are responsible for more intensive supply of oxygen per tissue volume unit in dolphins.

Animals↗
PubMed1984

Capillarization, mitochondrial densities, oxygen diffusion distances and innervation of red and white muscle of the lizard Dipsosaurus dorsalis.

The white and red regions of the iliofibularis muscle of the lizard Dipsosaurus dorsalis were analyzed using histologic and morphometric analysis. These regions are composed of fast glycolytic (FG) and both fast oxidative, glycolytic (FOG) and tonic fibers, respectively. Endplate morphology and number of endplates per fiber were estimated from fibers from both areas. Capillary volume densities of the red and white regions were quantified from transverse sections. Mitochondrial volume of fibers from the red and white regions were estimated from electron micrographs. All fibers from the white region of the iliofibularis possessed a single, well defined endplate, as did most red region fibers. The remaining red fibers (28 +/- 5%) possessed an average of 14.7 +/- 3 endplates each, distributed along the entire length of the fiber at intervals of approximately 1124 micron. Red fibers possessed twice the mitochondrial volume of white fibers (7.6 +/- 0.4%, red; 3.8 +/- 0.3%, white). Mitochondria were distributed uniformly through the fibers from both regions. Capillary anisotropy was low (gamma = 1.018) in both regions. Capillary densities of the red region (629 +/- 35 mm-2) were much greater than those of the corresponding white region (73 +/- 8 mm-2). The data indicate that capillary densities, mitochondrial volumes and theoretical diffusion distances correlate well with the oxidative capacity of lizard muscle fibers. Tonic fibers of this species appear oxidative and therefore metabolically capable of functioning during locomotion. The similar mitochondrial volumes and capillary densities of reptilian and mammalian muscles suggest that the greater oxidative capacity of mammalian muscle is due in part to possession of more oxidatively active mitochondria rather than to possession of more mitochondria per se.

Animals↗
PubMed1980

Chronic hypoxia does not affect guinea pig skeletal muscle capillarity.

The soleus and gastrocnemius muscles of chronically hypoxic guinea pigs were analyzed for capillary supply and myoglobin concentration. Weanling male guinea pigs were exposed to a simulated altitude of 5,100 m and an average ambient temperature of 22% C for 2, 4, 6, 10 and 14 weeks (range of BW 244--965 g). The soleus and gastrocnemius-plantaris muscles of one leg were analyzed for myoglobin concentration while the soleus and medial head of the gastrocnemius of the contralateral leg were cut at the midpoint, frozen and sectioned in a cryostat. The myosin ATPase method was used to visualize fibers and capillaries. Values of muscle weight, fiber cross sectional area, capillary density, capillary to fiber ratio and the number of capillaries around the fiber were compared to the values of the same parameters from normoxic guinea pigs selected to match the average body weights of the hypoxic animals. The growth rates of the two groups were not different. No significant differences in the regression lines for the normoxic and hypoxic animals were found so that when the data were combined no significant differences in the normoxic lines were introduced by adding the values of the hypoxic animals. The myoglobin values were significantly higher only in the hypoxic soleus after 14 weeks of exposure.

Aging↗
PubMed1992

Effects of anabolic steroids and high intensity exercise on rat skeletal muscle fibres and capillarization. A morphometric study.

The effects were investigated of high intensity short duration exercise and anabolic steroid treatment on the medial gastrocnemius muscle of female rats. Twelve rats were divided equally into four groups, exercise with and without steroid administration and sedentary with and without steroid administration. Animals were made to swim for 5 weeks, 6 days.week-1. Muscle fibres were classified as slow-twitch (ST), fast-twitch oxidative glycolytic (FOG) and fast-twitch glycolytic (FG). Muscle fibre size was measured as the equivalent circle diameter. Exercise (P less than 0.001) and steroid (P less than 0.05) treatments alone, significantly elevated FOG and decreased FG fibre proportions. Overall proportions of fast-twitch and ST muscle fibres did not vary with any of the treatments. Significant differences in the proportion of muscle fibres were found to exist between different areas within the gastrocnemius muscle (P less than 0.05). Exercise and steroid treatments alone did not alter muscle fibre diameters. Combined exercise and steroid treatments did significantly increase ST fibre diameters (P less than 0.05). Exercise only treatment resulted in significant increases in the number of capillaries surrounding ST fibre (P less than 0.05) and FOG fibre (P less than 0.01) types. In conclusion the main finding of this study indicated that anabolic steroids in conjunction with high intensity swimming instigated ST fibre hypertrophy. Exercise and steroid only treatments significantly elevated FOG fibre proportions while FG fibre proportions diminished. Exercise only treatment resulted in significant increases in the number of capillaries surrounding both ST and FOG fibre types.

Anabolic Agents↗