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Richard E. Triemer
Michigan State University
98Publications
25H-index
2,075Citations
Publications 98
Newest
Published on Dec 1, 2018in Scientific Reports4.01
Anna Karnkowska6
Estimated H-index: 6
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Photosynthetic euglenids (Euglenophyta) are a monophyletic group of unicellular eukaryotes characterized by the presence of plastids, which arose as the result of the secondary endosymbiosis. Many Euglenophyta plastid (pt) genomes have been characterized recently, but they represented mainly one family – Euglenaceae. Here, we report a comparative analysis of plastid genomes from eight representatives of the family Phacaceae. Newly sequenced plastid genomes share a number of features including sy...
Published on Aug 25, 2017in PeerJ2.35
Nadja Dabbagh2
Estimated H-index: 2
,
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University)
+ 1 AuthorsAngelika Preisfeld2
Estimated H-index: 2
BACKGROUND:Over the last few years multiple studies have been published showing a great diversity in size of chloroplast genomes (cpGenomes), and in the arrangement of gene clusters, in the Euglenales. However, while these genomes provided important insights into the evolution of cpGenomes across the Euglenales and within their genera, only two genomes were analyzed in regard to genomic variability between and within Euglenales and Eutreptiales. To better understand the dynamics of chloroplast g...
Published on Jun 1, 2017in Journal of Phycology2.83
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University),
Shin Han Shiu43
Estimated H-index: 43
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Published on Mar 1, 2017in Harmful Algae5.01
Paul V. Zimba27
Estimated H-index: 27
(A&M-CC: Texas A&M University–Corpus Christi),
I-Shuo Huang3
Estimated H-index: 3
(A&M-CC: Texas A&M University–Corpus Christi)
+ 3 AuthorsRichard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Abstract Euglena sanguinea is known to produce the alkaloid toxin euglenophycin and is known to cause fish kills and inhibit mammalian tissue and microalgal culture growth. An analysis of over 30 species of euglenoids for accumulation of euglenophycin identified six additional species producing the toxin; and six of the seven E. sanguinea strains produced the toxin. A phylogenetic assessment of these species confirmed most taxa were in the Euglenaceae, whereas synthesis capability apparently has...
Published on Feb 1, 2017in Journal of Phycology2.83
Bryan Lakey1
Estimated H-index: 1
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
The history of euglenoids may have begun as early as ~2 bya. These early phagotrophs ate cyanobacteria, archaea, and eubacteria, and the subsequent appearance of red algae and chromalveolates provided euglenoids with additional food sources. Following the appearance of green algae, euglenoids acquired a chloroplast via a secondary endosymbiotic event with a green algal ancestor. This endosymbiosis also involved a massive transfer of nuclear-encoded genes from the symbiont nucleus to the host. Ex...
Published on May 1, 2016in Journal of Eukaryotic Microbiology2.36
Chelsea M. Markunas1
Estimated H-index: 1
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Euglenids are an ancient lineage that may have existed as early as 2 billion years ago. A mere 65 years ago, Melvin Calvin and Andrew A. Benson performed experiments on Euglena gracilis and elucidated the series of reactions by which carbon was fixed and reduced during photosynthesis. However, the evolutionary history of this pathway (Calvin-Benson cycle) in euglenids was more complex than Calvin and Benson could have imagined. The chloroplast present today in euglenophytes arose from a secondar...
Published on Nov 1, 2015in Journal of Eukaryotic Microbiology2.36
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Over the last few years multiple studies have been published outlining chloroplast genomes that represent many of the photosynthetic euglenid genera. However, these genomes were scattered throughout the euglenophyceaean phylogenetic tree, and focused on comparisons with Euglena gracilis. Here, we present a study exclusively on taxa within the Euglenaceae. Six new chloroplast genomes were characterized, those of Cryptoglena skujai, E. gracilis var. bacillaris, Euglena viridis, Euglenaria anabaena...
Published on May 1, 2015in Journal of Eukaryotic Microbiology2.36
Anna Karnkowska6
Estimated H-index: 6
(University of Warsaw),
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University)
+ 3 AuthorsRichard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Photosynthetic euglenids acquired chloroplasts by secondary endosymbiosis, which resulted in changes to their mode of nutrition and affected the evolution of their morphological characters. Mapping morphological characters onto a reliable molecular tree could elucidate major trends of those changes. We analyzed nucleotide sequence data from regions of three nuclear-encoded genes (nSSU, nLSU, hsp90), one chloroplast-encoded gene (cpSSU) and one nuclear-encoded chloroplast gene (psbO) to estimate ...
Published on Jan 1, 2015
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University),
Bożena Zakryś11
Estimated H-index: 11
(University of Warsaw)
Euglenoids form a diverse group of eukaryotic organisms that may have arisen a billion years or more before the origins of plants and animals. They are largely unicellular flagellates with only one genus, and they form colonies. There are nearly 2,900 nominal species for the major photosynthetic taxa, but, of these, only about 800 are accepted as taxonomically valid. Modern phylogenetics has caused numerous changes in euglenoid taxonomy, which keeps the number of accepted species in constant tra...
Published on Mar 1, 2014in Journal of Eukaryotic Microbiology2.36
Matthew S. Bennett11
Estimated H-index: 11
(MSU: Michigan State University),
Richard E. Triemer25
Estimated H-index: 25
(MSU: Michigan State University)
Since its creation in 1917 the genus Cyclidiopsis, and its validity, has been a source of debate among euglenid taxonomists. While many authors have supported its legitimacy, various other authors have considered it to be a subgenus of Astasia or even promoted its complete dissolution. In this study, we have sequenced the small subunit and large subunit ribosomal DNA of Cyclidiopsis acus, the type species for the genus. Subsequent phylogenetic analyses showed that C. acus grouped with taxa from ...
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