Results 221 to 230 of about 44,420 (259)

Cloning and Sequencing of a Human 18S Ribosomal RNA Gene

DNA, 1985
A clone containing an 18S ribosomal RNA (rRNA) gene has been isolated from a human genomic library constructed in lambda Charon 4A. This gene was sequenced and found to be 1868 bp long. The sequence divergencies in the human 18S rRNA gene and the previously sequenced mouse and rat genes are found in one G + C-rich region of 110 bp located in the 5 ...
R M, Torczynski, M, Fuke, A P, Bollon
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Thermodynamics of the pseudo‐knot in helix 18 of 16S ribosomal RNA

Biopolymers, 2018
AbstractA fragment of E. coli 16S rRNA formed by nucleotides 500 to 545 is termed helix 18. Nucleotides 505‐507 and 524‐526 form a pseudo‐knot and its distortion affects ribosome function. Helix 18 isolated from the ribosome context is thus an interesting fragment to investigate the structural properties and folding of RNA with pseudo‐knots.
Monika Wojciechowska, Marta Dudek, Joanna Trylska   +2 more
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Systematics of Holometabolous Insect Orders Based on 18S Ribosomal RNA

Molecular Phylogenetics and Evolution, 1993
Phylogenetic relationships of 19 species representing nine holometabolous insect orders and three outgroup orders were examined using sequence data from two-thirds of the 18S nuclear ribosomal RNA molecule. Of 1330 aligned nucleotide sites in 19 taxa, 460 were variable and used for phylogenetic analysis.
D P, Pashley, B A, McPheron, E A, Zimmer
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Nuclear retention of 18S ribosomal RNA by human myeloma cells

Cell and Tissue Research, 1979
Normal quiescent lymphocytes regulate their ribosome content by selectively degrading newly synthesized 18S ribosomal RNA. Unlike actively dividing HeLa cells, lymphocytes retain 18S ribosomal RNA in the nucleus after synthesis instead of immediately transporting it to the cytoplasm.
J W, Bynum, E, Volkin
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In vitro transcription of ribosomal RNA on phage λrifd 18 DNA

Biochimica et Biophysica Acta (BBA) - Nucleic Acids and Protein Synthesis, 1978
In vitro transcription of ribosomal RNA was studied on the DNA of the transducing bacteriphage lambdarifd 18, which carries an rRNA transcription unit from Escherichia coli. rRNA synthesis was preferential at all polymerase/DNA ratios tested, and at the optimal 0.3 weight ratio nearly 60% of the transcript was rRNA.
I, Kiss, K, Slaska, J, Sümegi, A, Udvardy, P, Venetianer   +4 more
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Differential inhibition of 28s and 18s ribosomal RNA synthesis by actinomycin

Biochemical and Biophysical Research Communications, 1969
Abstract Low doses of actinomycin inhibit the synthesis of 28s ribosomal RNA to a greater extent than 18s ribosomal RNA in phytohaemagglutinin stimulated lymphocytes. Under these conditions the excess 18s RNA continues to enter the cytoplasm for extended periods.
J E, Kay, H L, Cooper
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18 S Ribosomal RNA Is Degraded during Ribosome Maturation in Irradiated HeLa Cells

Radiation Research, 1989
The effects of ionizing radiation (137Cs) on processing of ribosomal RNA (rRNA) were studied by pulse-labeling HeLa S3 cells with [3H]uridine immediately prior to irradiation. The 45 S rRNA precursor, and its two major daughter species, 28 and 18 S rRNA, were separated by gel electrophoresis and the extent of radiolabel incorporation into each was ...
J M, Krolak, D, McClain, S L, Snyder, P, Fuchs, K W, Minton   +4 more
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Requirement for intron-encoded U22 small nucleolar RNA in 18S ribosomal RNA maturation

Science, 1994
The nucleoli of vertebrate cells contain a number of small RNAs that are generated by the processing of intron fragments of protein-coding gene transcripts. The host gene (UHG) for intro-encoded human U22 is unusual in that it specifies a polyadenylated but apparently noncoding RNA.
K T, Tycowski, M D, Shu, J A, Steitz
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18S Ribosomal RNA Gene Sequences of Cochliopodium (Himatismenida) and the Phylogeny of Amoebozoa

Protist, 2005
Cochliopodium is a very distinctive genus of discoid amoebae covered by a dorsal tectum of carbohydrate microscales. Its phylogenetic position is unclear, since although sharing many features with naked "gymnamoebae", the tectum sets it apart. We sequenced 18S ribosomal RNA genes from three Cochliopodium species (minus, spiniferum and Cochliopodium sp.,
Alexander, Kudryavtsev, Detlef, Bernhard, Martin, Schlegel, Ema E Y, Chao, Thomas, Cavalier-Smith   +4 more
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A large nucleolar U3 ribonucleoprotein required for 18S ribosomal RNA biogenesis

Nature, 2002
Although the U3 small nucleolar RNA (snoRNA), a member of the box C/D class of snoRNAs, was identified with the spliceosomal small nuclear RNAs (snRNAs) over 30 years ago, its function and its associated protein components have remained more elusive. The U3 snoRNA is ubiquitous in eukaryotes and is required for nucleolar processing of pre-18S ribosomal
François, Dragon, Jennifer E G, Gallagher, Patricia A, Compagnone-Post, Brianna M, Mitchell, Kara A, Porwancher, Karen A, Wehner, Steven, Wormsley, Robert E, Settlage, Jeffrey, Shabanowitz, Yvonne, Osheim, Ann L, Beyer, Donald F, Hunt, Susan J, Baserga   +12 more
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