Terms beginning with P

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Component of matter.It may be a formless basic element, or composed of clusters of formless basic elements. For example, the electron is a formless basic particle.קרא עוד >

The number of people under follow up multiplied by the number of years each individual contributed to follow up.

This is the way to take into account the fact that different individuals contribute different time periods to follow up.קרא עוד >

Addition of a specific chemical group, Phosphoryl – PO32-, to a molecule. Phosphorylation serves to transfer energy and to control processes in cells of living organisms (e.g. for activating or delaying a process).קרא עוד >

A process whereby matter emits light after absorbing photons of electromagnetic radiationקרא עוד >

A basic particle representing a unit of energy of electromagnetic power. The photon has the characteristics of a wave and a particleקרא עוד >

Related to the functioning of the organs of a living organism.קרא עוד >

Quantitative data processing based on the results of different studies investigating the same research problem and conducted using comparable research methodologies.קרא עוד >

The amount of work performed per unit of time.This expresses the rate of transfer of energy from one form to another.Its unit of measure is Watt (W).קרא עוד >

The quantity of work of a physical system per unit of time per volume (volume power density, measured in standard units of Watts per cubic meter W/m3), or per area (flux density, measured in standard units of W/m2).קרא עוד >

A tool for managing health and environmental risks, applied when there is a significant level of scientific uncertainty regarding the overall health or environmental effects of a chemical or physical factor, it may be interpreted in different ways and thus is not uniformly applied.It is a guiding principle in determining policy for health and environmental protection.קרא עוד >

Quantitative expression of the possibility that an event will occur. An impossible event carries a probability of '0' and an absolutely certain event carries a probability of '1'.קרא עוד >

A study in which the development rate of a disease is examined and compared between a population group (cohort) that is exposed to a risk factor (e.g., smokers) and a population group that is not exposed to the risk factor (e.g. non-smokers).

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Large biological molecule composed of a sequence of small units of amino-acids. Proteins constitute a significant component of living organisms, and play an important role in both the structure of the cell and tissues, as well as in the function of the cells and the various body systems, such as: antibodies in the immune system, hormones (e.g. insulin), and enzymes (catalysts) in chemical processes in the body.קרא עוד >