Euglena
Mostrando 37-48 de 259 artigos, teses e dissertações.
-
37. Growth in Volume of Euglena gracilis During the Division Cycle1
The distribution of volumes of Euglena gracilis cells was measured conductimetrically. The volume spectrum of cultures in balanced growth was analyzed by the method of Collins and Richmond. The kinetics of volume increase of Euglena is neither linear nor exponential; the growth rate of small and large cells is low, but intermediate size cells show the larges
-
38. The Carotenoid Hydrocarbons of Euglena gracilis and Derived Mutants 1
An examination of the carotene fractions extracted from Euglena gracilis Z and pressure-bleached Euglena mutants PR-1, PR-2, PR-3, and PR-4 revealed phytoene in mutants PR-1, PR-2, and PR-3. Photosynthetic E. gracilis Z cultured at different light intensities showed no detectable phytoene, nor was phytoene found in mutant PR-4. However, dark-cultured E. grac
-
39. A pseudogene cluster in the leader region of the Euglena chloroplast 16S-23S rRNA genes.
The nucleotide sequence of a region (leader region) preceding the 5'-end of 16S-23S rRNA gene region of Euglena gracilis chloroplast DNA was compared with the homologous sequences that code for the 16S-23S rRNA operons of Euglena and E. coli. The leader region shows close homology in sequence to the 16S-23S rRNA gene region of Euglena (Orozco et al. (1980) J
-
40. INDUCTION OF EUGLENA TRANSFER RNA'S BY LIGHT*
Exposure of dark-grown, wild-type Euglena gracilis to light induces the formation of at least three new chromatographic species of tRNA. Parallel studies with a bleached mutant (W3BUL) of Euglena demonstrate that the induction of these new tRNA species is dependent upon the cell's ability to form chloroplasts and rule out the possibility that the new species
-
41. Chloroplast RNA Populations in Dark-Grown, Light-Grown, and Greening Euglena gracilis
RNA preparations from dark-grown, light-grown, and greening Euglena gracilis have been compared by polyacrylamide gel electrophoresis and by hybridization to Euglena chloroplast DNA. Chloroplast ribosomal RNA is not detected in dark-grown cells; its abundance increases in greening cells over a 72 hr period until the concentration characteristic of light-grow
-
42. In Vivo Photocycle of the Euglena gracilis Photoreceptor
We present the light-induced photocycle of the paraflagellar swelling of Euglena gracilis. The kinetics of this process was reconstructed by sampling its fluorescence emission and switching the excitation light from 365 nm to 436 nm. Stable intermediates in the photocycle were manifested. The measured millisecond resolution kinetics best fits a Michaelis-Men
-
43. Activities of various cobalamins for Euglena gracilis with reference to vitamin B12 assay with Euglena
Coenzyme B12 and methylcobalamin in water are less active in promoting growth of Euglena gracilis Z strain than the same concentrations of cyanocobalamin and hydroxocobalamin which are equally active. When bound to human serum or human liver homogenate, however, the activities of these four cobalamins do not differ significantly with one exception. The resul
-
44. Photomorphogenic Regulation of Chloroplast Replication in Euglena: ENHANCED LOSS OF CHLOROPLAST DNA IN RED LIGHT 1
Chloroplast replication in Euglena gracilis is specifically inhibited by ultraviolet light and the effect is photoreactivable.
-
45. Extremely large and slowly processed precursors to the Euglena light-harvesting chlorophyll a/b binding proteins of photosystem II
Antibody to the Euglena light-harvesting chlorophyll a/b binding protein of photosystem II (LHCPII) immunoprecipitated 207-, 161-, 122-, and 110-kDa proteins from total Euglena proteins pulse-labeled for 10 min with [35S]sulfate. The 25.6- and 27.2-kDa LHCPII were barely detectable in the immunoprecipitate. During a 40-min chase with unlabeled sulfate, the a
-
46. Characterization of the unique intron-exon junctions of Euglena gene(s) encoding the polyprotein precursor to the light-harvesting chlorophyll a/b binding protein of photosystem II.
The precursor to the Euglena light harvesting chlorophyll a/b binding protein of photosystem II (LHCPII) is a polyprotein containing multiple copies of LHCPII covalently joined by a decapeptide linker. cDNA and genomic clones encoding the 5' and 3' end of a 6.6 kb LHCPII mRNA were sequenced. A 3.1 kb genomic region encoding 1.05 kb of the 5' end of LHCPII mR
-
47. Chloroplast gene for Mr 32000 polypeptide of photosystem II in Euglena gracilis is interrupted by four introns with conserved boundary sequences.
The gene for the Mr 32000 herbicide binding polypeptide of photosystem II has previously been mapped to the 5 kbp EcoRI fragment Eco I of Euglena gracilis chloroplast DNA. The nucleotide sequence of 3324 bp of Eco I, containing the psbA locus, has been determined. This locus encodes a polypeptide of 345 amino acids which is co-linear with, and has 86% derive
-
48. Circular Chloroplast DNA from Euglena gracilis
Chloroplast DNA of the protozoan flagellate, Euglena gracilis, exists as circular molecules, 40 μm in contour length, as shown by electron microscopy and buoyant density analyses.