scholarly journals Dynamic Evolution of Telomeric Sequences in the Green Algal Order Chlamydomonadales

2012 ◽  
Vol 4 (3) ◽  
pp. 248-264 ◽  
Author(s):  
Jana Fulnečková ◽  
Tereza Hasíková ◽  
Jiří Fajkus ◽  
Alena Lukešová ◽  
Marek Eliáš ◽  
...  
Keyword(s):  
Dynamic Evolution ◽  
Telomeric Sequences ◽  
Green Algal

scholarly journals Dynamic Evolution of the Chloroplast Genome in the Green Algal Classes Pedinophyceae and Trebouxiophyceae

2015 ◽  
Vol 7 (7) ◽  
pp. 2062-2082 ◽  
Author(s):  
Monique Turmel ◽  
Christian Otis ◽  
Claude Lemieux
Keyword(s):  
Chloroplast Genome ◽  
Dynamic Evolution ◽  
Green Algal

scholarly journals Evolution and Unprecedented Variants of the Mitochondrial Genetic Code in a Lineage of Green Algae

2019 ◽  
Vol 11 (10) ◽  
pp. 2992-3007 ◽  
Author(s):  
David Žihala ◽  
Marek Eliáš
Keyword(s):  
Genetic Code ◽  
Protein Sequences ◽  
Dynamic Evolution ◽  
Translation System ◽  
Release Factor ◽  
Standard Genetic Code ◽  
Green Algal ◽  
Mitochondrial Genetic Code ◽  
Species Analysis ◽  
Direct Support

Abstract Mitochondria of diverse eukaryotes have evolved various departures from the standard genetic code, but the breadth of possible modifications and their phylogenetic distribution are known only incompletely. Furthermore, it is possible that some codon reassignments in previously sequenced mitogenomes have been missed, resulting in inaccurate protein sequences in databases. Here we show, considering the distribution of codons at conserved amino acid positions in mitogenome-encoded proteins, that mitochondria of the green algal order Sphaeropleales exhibit a diversity of codon reassignments, including previously missed ones and some that are unprecedented in any translation system examined so far, necessitating redefinition of existing translation tables and creating at least seven new ones. We resolve a previous controversy concerning the meaning the UAG codon in Hydrodictyaceae, which beyond any doubt encodes alanine. We further demonstrate that AGG, sometimes together with AGA, encodes alanine instead of arginine in diverse sphaeroplealeans. Further newly detected changes include Arg-to-Met reassignment of the AGG codon and Arg-to-Leu reassignment of the CGG codon in particular species. Analysis of tRNAs specified by sphaeroplealean mitogenomes provides direct support for and molecular underpinning of the proposed reassignments. Furthermore, we point to unique mutations in the mitochondrial release factor mtRF1a that correlate with changes in the use of termination codons in Sphaeropleales, including the two independent stop-to-sense UAG reassignments, the reintroduction of UGA in some Scenedesmaceae, and the sense-to-stop reassignment of UCA widespread in the group. Codon disappearance seems to be the main drive of the dynamic evolution of the mitochondrial genetic code in Sphaeropleales.

Blue-green algal flora on the rock surface of temples and monuments of India

1999 ◽  
Vol 110 (1-2) ◽  
pp. 133-144
Author(s):  
P. Tripathy ◽  
A. Roy ◽  
N. Anand ◽  
S. P. Adhikary
Keyword(s):  
Rock Surface ◽  
Algal Flora ◽  
Green Algal

Dynamic Evolution of Processes in Process-Aware Information Systems

2011 ◽  
Vol 22 (3) ◽  
pp. 417-438 ◽  
Author(s):  
Wei SONG ◽  
Xiao-Xing MA ◽  
Hao HU ◽  
Jian LÜ
Keyword(s):  
Information Systems ◽  
Dynamic Evolution

scholarly journals Growth of Haematococcus pluvialis on a Small-Scale Angled Porous Substrate Photobioreactor for Green Stage Biomass

2021 ◽  
Vol 11 (4) ◽  
pp. 1788
Author(s):  
Thanh-Tri Do ◽  
Binh-Nguyen Ong ◽  
Tuan-Loc Le ◽  
Thanh-Cong Nguyen ◽  
Bich-Huy Tran-Thi ◽  
...  
Keyword(s):  
Light Intensity ◽  
Algal Biomass ◽  
Haematococcus Pluvialis ◽  
Biomass Productivity ◽  
Pilot Scale ◽  
Small Scale ◽  
Porous Substrate ◽  
Low Light ◽  
Green Algal ◽  
Green Stage

In the production of astaxanthin from Haematococcus pluvialis, the process of growing algal biomass in the vegetative green stage is an indispensable step in both suspended and immobilized cultivations. The green algal biomass is usually cultured in a suspension under a low light intensity. However, for astaxanthin accumulation, the microalgae need to be centrifuged and transferred to a new medium or culture system, a significant difficulty when upscaling astaxanthin production. In this research, a small-scale angled twin-layer porous substrate photobioreactor (TL-PSBR) was used to cultivate green stage biomass of H. pluvialis. Under low light intensities of 20–80 µmol photons m−2·s−1, algae in the biofilm consisted exclusively of non-motile vegetative cells (green palmella cells) after ten days of culturing. The optimal initial biomass density was 6.5 g·m−2, and the dry biomass productivity at a light intensity of 80 µmol photons m−2·s−1 was 6.5 g·m−2·d−1. The green stage biomass of H. pluvialis created in this small-scale angled TL-PSBR can be easily harvested and directly used as the source of material for the inoculation of a pilot-scale TL-PSBR for the production of astaxanthin.

scholarly journals Fine-Structure Mapping of Meiosis-Specific Double-Strand DNA Breaks at a Recombination Hotspot Associated With an Insertion of Telomeric Sequences Upstream of the HIS4 Locus in Yeast

Genetics ◽  
1996 ◽  
Vol 143 (3) ◽  
pp. 1115-1125 ◽  
Author(s):  
Fei Xu ◽  
Thomas D Petes
Keyword(s):  
Meiotic Recombination ◽  
Hydroxyl Groups ◽  
Sequence Specificity ◽  
Structure Mapping ◽  
Dna Breaks ◽  
Exonuclease Iii ◽  
Recombination Hotspot ◽  
Telomeric Sequences ◽  
Double Strand Dna Breaks ◽  
Double Strand Dna

Abstract Meiotic recombination in Saccharomyces cerevisiae is initiated by double-strand DNA breaks (DSBs). Using two approaches, we mapped the position of DSBs associated with a recombination hotspot created by insertion of telomeric sequences into the region upstream of HIS4. We found that the breaks have no obvious sequence specificity and localize to a region of ~50 bp adjacent to the telomeric insertion. By mapping the breaks and by studies of the exonuclease III sensitivity of the broken ends, we conclude that most of the broken DNA molecules have blunt ends with 3′-hydroxyl groups.

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