We excise the meristem under the microscope (0.3 mm long) and culture it on tissue culture media. The resulting plant from the meristem is grown in the greenhouse and tested for viruses. Virus-free plants are tested by DNA fingerprinting methods to assure that the correct variety is to be returned to the customers. brief description of the steps involved is as follows: Step 1: Meristem culture Several meristems are cultured to obtain several plants for later testing. Generally the success rate is 20% in virus elimination. Step 2: Virus testing All 17 viruses known to be present in California are tested by PCR method.
undetermined - not precisely determined or established; not fixed or known in advance; of indeterminate age; a zillion is a large indeterminate number; an indeterminate point of law; the influence of environment is indeterminate; an indeterminate future. indeterminate.
From the Latin terminus (â a boundary, a limit â) and ante (â before â) and quem (â which â), the accusative of quÄ« (â what â). Literally meaning the limit before which. Noun . terminus ante quem. the date before which a document must have been written; the date before which an archaeological artifact must have been deposited; See also