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.
Wiktionary(3.00 / 1 vote)Rate this definition: 1  sempiternal(Adjective) Seemingly everlasting or eternal. 2  sempiternal(Adjective) everlasting, that is having infinite temporal duration; as opposed to eternal, outside time and thus lacking temporal duration.