منابع مشابه
A vanished history of skeletonization in Cambrian comb jellies
Ctenophores are traditionally regarded as "lower" metazoans, sharing with cnidarians a diploblastic grade of organization. Unlike cnidarians, where skeletonization (biomineralization and sclerotization) evolved repeatedly among ecologically important taxa (for example, scleractinians and octocorals), living ctenophores are characteristically soft-bodied animals. We report six sclerotized and ar...
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Although silicic acid jellies are inferior to agar, gelatin, blood serum or egg white in the preparation of solid media for the majority of bacteriological requirements, there are certain specialized purposes, such as the isolation of autotrophic bacteria, for which an inorganic jelly is necessary. Theoretical advantages from the utilization of silica gel as a specialized substitute for organic...
متن کاملStochasticity of gene products from transcriptional pulsing.
Transcriptional pulsing has been observed in both prokaryotes and eukaryotes and plays a crucial role in cell-to-cell variability of protein and mRNA numbers. An important issue is how the time constants associated with episodes of transcriptional bursting and mRNA and protein degradation rates lead to different cellular mRNA and protein distributions, starting from the transient regime leading...
متن کاملTranscriptional Pulsing of a Developmental Gene
It has not been possible to view the transcriptional activity of a single gene within a living eukaryotic cell. It is therefore unclear how long and how frequently a gene is actively transcribed, how this is modulated during differentiation, and how transcriptional events are dynamically coordinated in cell populations. By means of an in vivo RNA detection technique , we have directly visualize...
متن کاملTranscriptional pulsing of a nucleolar transgene
The pulsatile nature of transcription has recently emerged as an important property of gene expression. Here we report on the characterization of a RNA polymerase II transgene that is transcribed in the nucleolus. Using the MS2-GFP reporter system and live cell imaging, we found that the synthesis of a MS2-tagged transcript in the nucleolus was discontinuous in all of the cells that were observ...
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ژورنال
عنوان ژورنال: Science
سال: 2013
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.339.6117.251-a