The act or process of laying in strata, or the state of being laid in the form of strata, or layers.

The deposition of material in successive layers in the growth of a cell wall, thus giving rise to a stratified appearance.

A system of social hierarchy that may be organized around differences in wealth or power, as well as around ascribed statuses such as race or sex.

The characteristic layering or bedding of sedimentary rocks.

Pre-germination treatment to break dormancy in seeds and to promote rapid uniform germination. Accomplished by subjecting imbibed seeds to a pre-chill treatment.

The simulation of the soil conditions of fall and winter. Seeds are placed in a moist, sterile potting medium or sand, or kept in a cold dry place – depending on the treatment strategy (see Appendix B).

Read the entry on pretreating seeds first. Ok. So the seed must first undergo a cold period (just above freezing at 35 or so degrees F) before germination can occur. Instead of waiting an entire season or year, hasten the process by chilling seeds in the refrigerator. To prevent seeds from sticking and to keep them evenly damp, pack them together with vermiculite or sphagnum moss. Place in an airtight container or bag. Do not remove until the appropriate time period has passed. Each variety of seed has its own requirements.

The storing of seeds at low temperatures under moist conditions to break physiological dormancy or rest.

A way of ordering individual people within a social system. The different rungs of the ladder depend on, for example, income, education, work, or power. The term can also mean ranking anything on different levels, by group or category.

division into groups. Stratification may also refer to a process to control for differences in confounding variables, by making separate estimates for groups of individuals who have the same values for the confounding variable. ( Therapy)

the degree to which there is an uneven distribution of resources among different groups of individuals and states (91)

Statistical tool based on showing data so that individual characteristics can be observed. The process of grouping data according to common characteristics so that these differences which might affect the outcome of the research can be taken into account.

Occurs in blended fuels that have a compatibility problem. It is usually experienced when paraffinic based oils are mixed with asphaltic based oils, causing asphaltenes to precipitate and settle to the bottom of the tank.

A condition where the concentration of acid is greater at the bottom of the battery than at the top. This condition is caused by undercharging, and if not corrected can cause premature failure of the battery. This condition can be prevented by periodic equalization.

Occurs when the acid concentration varies from top to bottom inside the battery electrolyte. Periodic equalization produces gassing that will mix the electrolyte. (See Equalization)

Over time, electrolyte tends to separate. The electrolyte at the top of the battery becomes watery while it becomes more acidic at the bottom. This effect is corrosive to the plates. Equalization of flooded (or wet) batteries helps reduce stratification. Jump to Top