Word Finder - membranes

definition

A flexible enclosing or separating tissue forming a plane or film and separating two environments (usually in a plant or animal).

definition

A mechanical, thin, flat flexible part that can deform or vibrate when excited by an external force.

definition

A flexible or semi-flexible covering or waterproofing whose primary function is to exclude water.

These vascular membranes are called the lateral septa.

Inner and outer membranes may exist on the bronchi.

The majority of birds possess a pair of internal tympaniform membranes forming the inner or median walls of the bronchi, which are there furnished with semi-rings only.

External tympaniform membranes exist, with great variations, between the specialized one or two last tracheal and some of the first bronchial rings.

Elastin occurs either as thick strands or as membranes; it constitutes the " elastic tissue " of the anatomist.

This section comprehends three species only, known as Phalaropes or swimming sandpipers, which are distinguished by the membranes that fringe their toes, in two of the species forming marginal lobes,' and by the character of their lower plumage, which is as close as that of a duck.

Experiments with membranes of copper ferrocyanide have verified this result for solutions of cane-sugar of moderate dilutions.

Although even good membranes of copper ferrocyanide are rarely perfectly semi-permeable, and in other membranes such as indiarubber, &c., which have been used, the defects from the theoretical values of the equilibrium pressure are very great, yet, in the light of the exact verification of theory given by the experiments described above, it is evident that such failures to reach the limiting value in no wise invalidate the theory of osmotic equilibrium.

The conceptions of osmotic pressure and ideal semi-permeable membranes enable us to deduce other thermodynamic relations between the different properties of solutions.

The passage of dissolved substances through animal and vegetable membranes was the subject of many early experiments.

It was found that substances like mineral salts, which crystallize well from solution, passed such membranes with comparative ease, while the jelly-like substances such as albumen passed with extreme slowness if at all.

As in other cell-walls, so here the older membranes may be altered by deposits of various substances, such as resin, calcium oxalate, colouring matters; or more profoundly altered throughout, or in definite layers, by lignification, suberization (Trametes, Daedalea), or swelling to a gelatinous mucilage (Tremella, Gymnosporangium), while cutinization of the outer layers is common.

P. Pfeffer (Osmotische Untersuchungen, Leipzig, 1877) was the first to obtain satisfactory measurements of osmotic pressures of cane-sugar solutions up to nearly I atmosphere by means of semi-permeable membranes of copper ferrocyanide.

The serous membranes show petechiae and haemorrhages.

The substance of the brain, spinal cord and nervetrunks is normal, but the membranes are engorged.

The most important applications of the theory of vibrations are to the case of continuous systems such as strings, bars, membranes, plates, columns of air, where the number of degrees of freedom is infinite.

They pass more readily through mucous membranes, but almost every one of these is provided not only with a coating of mucus, which obstructs their passage, but with some reflex mechanism which tends to remove them.

For the purpose of checking the inflammatory processes and lessening discharge from mucous membranes astringents are employed.

They are also employed locally as sprays and douches to the nose, throat, vagina and rectum, for catarrhal conditions of the mucous membranes.

When the swollen wall is dense and regular in appearance the term " capsule " is applied to the sheath as in Leuconostoc. Secreted pigments (red, yellow, green and blue) are sometimes deposited in the wall, and some of the iron-bacteria have deposits of oxide of iron in the membranes.

They dissolve in water to form solutions, which do not penetrate parchment membranes, hence the name colloidal.

The treatment consists in the use of solutions of common salt, followed by copious draughts of milk or white of egg and water or soap in water, in order to dilute the poison and protect the mucous membranes of the oesophagus and stomach from its action.

Subjection to the temperature of boiling water for, say, half an hour seemed an efficient mode of sterilization, until it was discovered that the spores of bacteria are so involved in heat-resisting membranes, that only prolonged exposure to dry, baking heat can be recognized as an efficient process of sterilization.

Formerly the animal oils and fats were obtained by heating the tissues containing the oils or fats over a free fire, when the cell membranes burst and the liquid fat flowed out.

The action of tannic acid is strictly local, and depends upon its power of precipitating albumen and of destroying germs. It thus acts as an astringent on all mucous membranes.

They are readily absorbed into the blood, and they are excreted chiefly by the kidneys in a more or less altered form, and probably also by the different mucous membranes, and even by the skin.

How are such small amounts of vitamin E able to protect cell membranes against sustained free radical attack?

Quercetin possesses powerful antioxidant properties and like other bioflavonoids, has the ability to stabilize cell membranes.

Toxic substances may disturb normal cell function, damage cell membranes, interfere with enzyme and immune systems and RNA and DNA activity.

This means that contractions are started with an unfavorable cervix, often with the membranes still intact.

Envelope membranes from spinach chloroplasts are a site of metabolism of fatty acid hydroperoxides.

Type v collagen has also been found in the basement membranes of muscle fibers, except at the point where muscle fibers are innervated.

Regenerated cellulose was the original industry standard but Professor Courtney started his research career by developing synthetic membranes based on vinyl copolymers.

These membranes are called the meninges, the outermost membrane is called the dura mater, then the arachnoid and then the pia mater.

Control is exerted within a network of membranes called endoplasmic reticulum (ER ), which transports proteins throughout the cell.

A purulent exudate extends along the meningeal membranes, accompanied by hemorrhage and thrombosis.

For example, precursors of SREBP (sterol response element binding protein) transcription factors are integral proteins embedded in endoplasmic reticulum membranes.

Keep Moist There are solutions or ointments that you can use in-flight to keep your nasal membranes moist.

It appears, however, to be associated with a leucine transporter system across neuronal cell membranes and may increase intracellular GABA.

Landfills are lined with clay and flexible synthetic membranes intended to prevent leachate escaping and contaminating the groundwater.

Each capsule is prepared in a base of essential fatty acids, including lecithin, the major component of cell membranes.

Other triggers cab be changes in host defenses e.g. friction during sexual intercourse inflaming the mucous membranes.

The ear flaps, the tympanic membranes, are the two large ' scales ' just behind the jaw-bone.

An allergic reaction occurs in the mucus membranes that line the inside of its nasal passages.

It reacts by immunoblotting with a component of 30 - 35 kDa in reduced or non - reduced erythrocyte membranes.

In order for a cell to use calcium as a signaling molecule, the cell must create calcium gradients across membranes.

The disorder can affect the mucous membranes of the mouth and genitals where it looks like a grayish erosion (shallow ulcer ).

Synthetic membranes are best covered with a loose mulch.

Calcium also helps conduct nerve impulses, regulate your heartbeat, and maintain cell membranes.

Physiological Properties of TTX TTX is an especially potent neurotoxin, specifically blocking voltage-gated sodium channels on the surface of nerve membranes.