Isotonic Solutions

Isotonic Solutions

 

solutions with the same osmotic pressure; in biology and medicine, natural or artificially prepared solutions with the same osmotic pressure as that of the content of animal and plant cells, blood, and interstitial fluids.

In normally functioning animal cells the intracellular content is usually isotonic with the extracellular fluid. When there is severe disruption of the isotonicity of the solutions in a plant cell and its surrounding medium, water and dissolved substances are transferred freely into or out of the cell, which may lead to a disturbance of normal cell functions. As a rule, isotonic solutions are close to sea water in composition and concentration. For warm-blooded animals, a 0.9 percent solution of NaCl and a 4.5 percent solution of glucose are isotonic. Isotonic solutions that are close in composition, pH, buffering capacity, and other properties to blood serum are called physiological solutions (Ringer’s solution for cold-blooded animals; Ringer-Locke’s and Ringer-Tyrode’s solutions for warm-blooded animals). Compounds of high molecular weight (dextran, polyvinol) are introduced into isotonic hemosubstitutive solutions to create colloidal-osmotic pressure.

A. A. BULYCHEV and V. A. SOLOV’EV

References in periodicals archive ?
This instructional strategy proved to be effective except for two major topics in the course: acids and bases, especially buffered and isotonic solutions problems, and respectively chemical kinetics problems.
b05da00 isotonic solutions bag with glucose polymers x 2000 ml, icodextrin 75 g / l; sodium chloride 5.4 g / l; calcium chloride 0.257 g / l, magnesium chloride 0.051 g / l; sodium lactate solution 4.5 g / l - 2 000 ml, estimated 500 bags.
Isotonic solutions (Ringer's lactate and Normal saline) had been administered to 27 (23.7%) patients.
However, recent studies have demonstrated that the tonicity of the enteral rehydration solution affects the level of water and electrolyte absorption, with hypotonic solutions resulting in better water absorption than isotonic solutions in children (RAUTANEN et al., 1993), laboratory animals (NISHINAKA et al., 2004), and horses (RIBEIRO FILHO et al., 2014).
Here, we discuss the role played by isotonic solutions in facilitating bacterial reproduction.
Isotonic solutions are appropriate for patients suffering from extracellular fluid deficits such as in hemorrhaging or hypovolemic shock.
The exercise is followed by a series of questions to help students understand the concept of hypotonic, hypertonic, and isotonic solutions. To further explore the concept of tonicity, students may carry out an extension exercise with potato strips and a 20% NaC1 solution to understand how the presence of a cell wall in plants affects their response to a hypertonic solution.
The pellet was resuspended to the volume of 2 ml in each one of the following isotonic solutions: a) PBS (136.9 nM NaCl, 2.8 mM KCl, 1.47 mM K[H.sub.2]P[O.sub.4], 8.1 mM [Na.sub.2]P[O.sub.4]), pH 7.4; b) PBS with 50 mg/ml albumin; c) an isotonic glucose solution; d) a solution of 250 mM sucrose, 2 mM HEPES pH 7.4; e) saline solution 0.9% (w/v) NaCl (i.e.
One of the advantages of ciclesonide is that, unlike most intranasal sprays currently available as isotonic solutions, ciclesonide is in a hypotonic saline solution, which is somewhat more tolerable to patients, he said.
One of ciclesonide's advantages is that unlike most nasal sprays currently available as isotonic solutions, ciclesonide is in a hypotonic saline solution, which is somewhat more tolerable to patients, he said.
Most (21 of 24) of the lobsters exposed to isotonic solutions lacking chloride showed a typical bradycardia response (Fig.