The current study focuses on the biological diversity of two strains Antarctic diatoms (strains IMA082A and IMA088A) collected isolated from Ross Sea (Antarctica) during XXXIV Italian Expedition. Both species presented typical morphological characters genus Craspedostauros: cribrate areolae, “fore-and-aft” chloroplasts a narrow “stauros”. This classification is congruent with molecular phylogen...

Vesicomyid clams depend entirely on sulfur-oxidizing endosymbiotic bacteria for their nutriment. Endosymbionts that are transmitted cytoplasmically through eggs, such as these, should exhibit a phylogenetic pattern that closely parallels the phylogeny of host mitochondrial genes. Such parallel patterns are rarely observed, however, because they are obscured easily by small amounts of horizontal...

Specimens of Dictyocaulus spp. were extracted from the respiratory tracts of 3 ruminant hosts including roe deer (Capreolus capreolus), red deer (Cervus elaphus), and chamois (Rupicapra rupicapra) from wild populations in the province of Le6n, northwestern Spain. The near-complete nuclear small-subunit ribosomal RNA gene, and 2 regions of the large-subunit ribosomal RNA gene, were amplified by ...

Dinophysoid dinoflagellates are usually considered a large monophyletic group. Large subunit and small subunit (SSU) rDNA phylogenies suggest a basal position for Amphisoleniaceae (Amphisolenia,Triposolenia) with respect to two sister groups, one containing most Phalacroma species plus Oxyphysis and the other Dinophysis,Ornithocercus, Dinophysoid dinoflagellates are usually considered a large m...

Modes and rates of molecular evolution, and congruence and combinability for phylogenetic reconstruction, of portions of the nuclear large ribosomal subunit (nLSU-rDNA) and mitochondrial small subunit (mtSSU-rDNA) genes were investigated in the mushroom genus Amanita. The AT content was higher in the mtSSU-rDNA than in the nLSU-rDNA. A transition bias in which AT substitutions were as frequent ...

Among the marine planktonic diatoms, Chaetoceros is among most species-rich genera, and many species are considered important primary producers. However, little known about ecology distribution of few small solitary within this genus, including tenuissimus. This article describes a minute strain, identified as C. tenuissimus (named CT16ED) that was isolated at coastal lagoon in Corsica Island, ...

Poriella subacida gen. & comb. nov., previously known as Perenniporia subacida, which causes white rot, has been documented in temperate and tropical forests. Specimens from Asia, North America, Europe were examined, including the type specimen of Polylorus subacidus. Sequences ITS1-5.8S-ITS2 region, 28S rDNA, mitochondrial rDNA small subunit (mtSSU), gene encoding translation elongation fa...

background: caddisflies have significant roles in freshwater ecosystems. morphological identification is the major impediment in accurate species identification of hydropsychids. mitochondrial and nuclear markers are suitable for molecular systematics of these group of arthropods. methods: trichopteran specimens of lavasan district in northeastern tehran, iran were collected in 2012, and de­scr...

UAF is a multi-subunit complex that functions in the activation of rDNA transcription by RNA polymerase I (Pol I). Cells lacking the Uaf30 subunit of UAF reduce the rRNA synthesis rate by ~70% compared to WT, and produce rRNA using both Pol I and Pol II. Miller chromatin spreads demonstrated that even though there is an overall reduction in rRNA synthesis in uaf30 mutants, the active rDNA genes...