منابع مشابه
Homology-dependent gene silencing in Paramecium.
Microinjection at high copy number of plasmids containing only the coding region of a gene into the Paramecium somatic macronucleus led to a marked reduction in the expression of the corresponding endogenous gene(s). The silencing effect, which is stably maintained throughout vegetative growth, has been observed for all Paramecium genes examined so far: a single-copy gene (ND7), as well as memb...
متن کاملRepression of gene expression by cdll products in Paramecium.
individual paramecium can synthesize many serologically distinct surface Ayntigens, each of which is specified by a separate locus. The environment, acting through the cytoplasm, selects which of these ciliary proteins is to be expressed. All of the remaining immobilization antigens are excluded from expression (BEALE 1957'). In a constant environment each serotype can be passed on and maintain...
متن کاملAction mirroring and action understanding in children
The past decade has experienced an increasing interest in action underestanding and children’s mirroring of others’ behavior. Behavioral investigations have focused on the development and significance of mimicry, goal prediction and imitation. Others have focused on the neural basis of action mirroring, identifying particular electrophysiological markers or related brain regions. A vivid debate...
متن کاملTransformation of Paramecium by microinjection of a cloned serotype gene.
Paramecia of a given serotype express only one of several possible surface proteins called immobilization antigens (i-antigens). A 16-kilobase plasmid containing the gene for immobilization antigen A from Paramecium tetraurelia, stock 51, was injected into the macronucleus of deletion mutant d12, which lacks that gene. Approximately 40% of the injected cells acquired the ability to express sero...
متن کاملCiliary Motion in Paramecium
The scanning electron microscope (SEM) provides an ideal system for studying the three-dimensional surface structure of biological materials . Our previous work on the protozoan Opalina showed that instantaneous fixation, combined with critical point drying, faithfully preserved the pattern of ciliary coordination and the form of ciliary beat for scanning electron microscopy (1, 2) . I report h...
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ژورنال
عنوان ژورنال: Annals of the Missouri Botanical Garden
سال: 1945
ISSN: 0026-6493
DOI: 10.2307/2394258