Results 301 to 310 of about 309,135 (337)

The phylogenetic position of taxaceae based on 18S rRNA sequences

Journal of Molecular Evolution, 1993
The evolutionary position of the yew family, Taxaceae, has been very controversial. Some plant taxonomists strongly advocate excluding Taxaceae from the conifer order and raising its taxonomic status to a new order or even class because of its absence of seed cones, contrary to the case in the majority of conifers.
S M, Chaw, H, Long, B S, Wang, A, Zharkikh, W H, Li   +4 more
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Comparison of the nucleotide sequence of soybean 18S rRNA with the sequences of other small-subunit rRNAs

Journal of Molecular Evolution, 1985
We present the sequence of the nuclear-encoded ribosomal small-subunit RNA from soybean. The soybean 18S rRNA sequence of 1807 nucleotides (nt) is contained in a gene family of approximately 800 closely related members per haploid genome. This sequence is compared with the ribosomal small-subunit RNAs of maize (1805 nt), yeast (1789 nt), Xenopus (1825 ...
V K, Eckenrode, J, Arnold, R B, Meagher
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18S rRNA sequences of Leishmania enriettii promastigote and amastigote

International Journal for Parasitology, 1991
Dideoxy sequencing with reverse transcriptase and universal primers was used to obtain partial sequences of the 18S rRNAs from the promastigote and amastigote life-cycle stages of L. enriettii. Approximately 1400 nucleotides of sequence from the two stages were compared.
K G, Field, S M, Landfear, S J, Giovannoni   +2 more
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18S rRNA suggests that Entoprocta are protostomes, unrelated to Ectoprocta

Journal of Molecular Evolution, 1996
The Ento- and Ectoprocta are sometimes placed together in the Bryozoa, which have variously been regarded as proto- or deuterostomes. However, Entoprocta have also been allied to the pseudocoelomates, while Ectoprocta are often united with the Brachiopoda and Phoronida in the (super)phylum Lophophorata.
Mackey, L.Y., Winnepenninckx, B., de Wachter, R., Backeljau, T., Emschermann, P., Garey, J.R.   +5 more
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Intermolecular hybridization of 5S rRNA with 18S rRNA: Identification of a 5′-terminally-located nucleotide sequence in mouse 5S rRNA which base-pairs with two specific complementary sequences in 18S rRNA

Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression, 1991
Eukaryotic 5S rRNA hybridizes specifically with 18S rRNA in vitro to form a stable intermolecular RNA:RNA hybrid. We have used 5S rRNA/18S rRNA fragment hybridization studies coupled with ribonuclease digestion and primer extension/chain termination analysis of 5S rRNA:18S rRNA hybrids to more completely map those mouse 5S rRNA and 18S rRNA sequences ...
K D, Sarge, E S, Maxwell
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Novelty in Phylogeny of Gastrotricha: Evidence from 18S rRNA Gene

Molecular Phylogenetics and Evolution, 1999
Gastrotricha form a phylum which is crucial for defining the origin of pseudocoelomates, in that they share a number of characters with Rotifera and Nematoda but also with acoelomates, and even the evolutionary relationships within the phylum are anything but defined.
WIRZ A, PUCCIARELLI, Sandra, MICELI, Cristina, TONGIORGI P, BALSAMO M.   +4 more
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Details of Gastropod Phylogeny Inferred from 18S rRNA Sequences

Molecular Phylogenetics and Evolution, 1998
Some generally accepted viewpoints on the phylogenetic relationships within the molluscan class Gastropoda are reassessed by comparing complete 18S rRNA sequences. Phylogenetic analyses were performed using the neighbor-joining and maximum parsimony methods.
Winnepenninckx, B., Steiner, G., Backeljau, T., de Wachter, R.   +3 more
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Cryptomonad nuclear and nucleomorph 18S rRNA phylogeny

European Journal of Phycology, 1996
Nuclear and nucleomorph 18S ribosomal RNA genes from six cryptomonads were amplified by the polymerase chain reaction and sequenced. Phylogenetic trees were constructed by distance, parsimony, and maximum likelihood methods for all available cryptomonad nuclear and nucleomorph 18S rRNA sequences.
T. Cavalier-Smith, J. A. Couch, K. E. Thorsteinsen, P. Gilson, J. A. Deane, D. R. A. Hill, G. I. Mcfadden   +6 more
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N6-methyladenosine (m6A) in 18S rRNA promotes fatty acid metabolism and oncogenic transformation

Nature Metabolism, 2022
Hao Peng, Bin-bin Chen, Wei Wei, Siyao Guo, Hui Han, Chunlong Yang, Jieyi Ma, Lu Wang, S. Peng, Ming Kuang, Shuibin Lin   +10 more
semanticscholar   +1 more source

The phylogenetic position of Siboglinidae (Annelida) inferred from 18S rRNA, 28S rRNA and morphological data

Cladistics, 2004
AbstractWe assess the phylogenetic position of Siboglinidae (previously known as the phyla Pogonophora and Vestimentifera, but now referred to Annelida) in parsimony analyses of 1100 bp from 18S rRNA, 320 bp from the D1 region of 28S rRNA, and 107 morphological characters, totaling 667 parsimony informative characters.
Rousset, Vincent, Rouse, Greg W., Siddall, Mark E., Tillier, Annie, Pleijel, Fredrik   +4 more
openaire   +3 more sources