7 Record(s)

Thermodynamics (chemical)

The study of the interrelation of heat and work with chemical reactions or with physical changes of state within the confines of the laws of thermodynamics.


A route of administration meaning to be applied to the skin or body's surface area, with penetrating any cavity.

Total Dissolved Solids (TDS)

A measure of the combined content of all inorganic and organic substances contained in a liquid in: molecular, ionized or micro-granular suspended form. Generally the operational definition is that the solids must be small enough to survive filtration through a filter with two-micron (2,000nm or 0.002mm) pores. [NOTE: a TDS Meter is not an accurate way to measure the Concentration of silver colloids. For more, read here .]


The degree to which a substance can harm humans or animals. Acute toxicity involves harmful effects in an organism through a single or short-term exposure. Chronic toxicity is the ability of a substance or mixture of substances to cause harmful effects over an extended period, usually upon repeated or continuous exposure, sometimes lasting for the entire life of the exposed organism.

Traditional Medicine

The sum total of the knowledge, skills, and practices based on the theories, beliefs, and experiences indigenous to different cultures, whether explicable or not, used in the maintenance of health as well as in the prevention, diagnosis, improvement or treatment of physical and mental illness. See also Medicine, Alternative Medicine.

Transmission electron microscopy (TEM)

A microscopy technique in which a beam of electrons is transmitted through an ultra-thin specimen, interacting with the specimen as it passes through. An image is formed from the interaction of the electrons transmitted through the specimen; the image is magnified and focused onto an imaging device, such as a fluorescent screen, on a layer of photographic film, or to be detected by a sensor such as a CCD camera. A TEM is a practical application of wave-particle duality since electrons, usually considered particles, are used as light waves to form images. A TEM can provide upwards of 5,000,000 times magnification, and give visibility almost down to the nuclear level.

Tyndall Effect

The scattering of light by dispersed colloidal particles or emulsion suspensions, named after the Irish scientist John Tyndall. The suspended particles reflect the light, making a beam of lighting passing through it more visible. This effect can be used to determine whether a colloid has large particles or not. The Tyndall effect is noticeable when car headlights are used in fog and the light beams are visible versus in clear weather the light beams are invisible. The finer or smaller the dispersed particles, the smaller the diameter cone of light beam scatter.