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Articoli di riviste sul tema "Achromatique"

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Autore: Grafiati
Pubblicato: 7 luglio 2024
Ultima modifica: 7 luglio 2024

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1

Gay, Jean, Yves Rabbia e Pierre Baudoz. "Le coronographe interférentiel achromatique". Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy 325, n. 1 (luglio 1997): 51–56. http://dx.doi.org/10.1016/s1251-8069(97)83264-2.

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2

Gay, Jean, François Fressin, Jean-Pierre Rivet, Yves Rabbia e Christophe Buisset. "Un coronographe interférentiel achromatique coaxial". Comptes Rendus Physique 6, n. 10 (dicembre 2005): 1169–75. http://dx.doi.org/10.1016/j.crhy.2005.12.001.

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3

Aime, Claude, Alexis Carlotti e Gilbert Ricort. "Proposition de coronographe achromatique à quatre quadrants". Comptes Rendus Physique 8, n. 7-8 (settembre 2007): 961–66. http://dx.doi.org/10.1016/j.crhy.2007.10.007.

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4

Mouchart, J., J. Begel e S. Chalot. "Dépôts Achromatiques Partiellement Réfléchissants". Journal of Modern Optics 37, n. 5 (maggio 1990): 875–88. http://dx.doi.org/10.1080/09500349014550931.

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5

Gray, N. D., R. Howarth, R. W. Pickup, J. Gwyn Jones e I. M. Head. "Substrate Uptake by Uncultured Bacteria from the Genus Achromatium Determined by Microautoradiography". Applied and Environmental Microbiology 65, n. 11 (1 novembre 1999): 5100–5106. http://dx.doi.org/10.1128/aem.65.11.5100-5106.1999.

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ABSTRACT Microautoradiography was used to investigate substrate uptake by natural communities of uncultured bacteria from the genusAchromatium. Studies of the uptake of14C-labelled substrates demonstrated thatAchromatium cells from freshwater sediments were able to assimilate 14C from bicarbonate, acetate, and protein hydrolysate; however, 14C-labelled glucose was not assimilated. The pattern of substrate uptake by Achromatiumspp. was therefore similar to those of a number of other freshwater and marine sulfur-oxidizing bacteria. Different patterns of radiolabelled bicarbonate uptake were noted for Achromatium communities from different geographical locations and indicated that one community (Rydal Water) possessed autotrophic potential, while the other (Hell Kettles) did not. Furthermore, the patterns of organic substrate uptake within a single population suggested that physiological diversity existed in natural communities of Achromatium. These observations are consistent with and may relate to the phylogenetic diversity observed in Achromatium communities. Incubation of Achromatium-bearing sediment cores from Rydal Water with35S-labelled sulfate in the presence and absence of sodium molybdate demonstrated that this bacterial population was capable of oxidizing sulfide to intracellular elemental sulfur. This finding supported the role of Achromatium in the oxidative component of a tightly coupled sulfur cycle in Rydal Water sediment. The oxidation of sulfide to sulfur and ultimately to sulfate byAchromatium cells from Rydal Water sediment is consistent with an ability to conserve energy from sulfide oxidation.
6

Gray, N. D., R. Howarth, A. Rowan, R. W. Pickup, J. Gwyn Jones e I. M. Head. "Natural Communities of Achromatium oxaliferum Comprise Genetically, Morphologically, and Ecologically Distinct Subpopulations". Applied and Environmental Microbiology 65, n. 11 (1 novembre 1999): 5089–99. http://dx.doi.org/10.1128/aem.65.11.5089-5099.1999.

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ABSTRACT The diversity and ecology of natural communities of the uncultivated bacterium Achromatium oxaliferum were studied by use of culture-independent approaches. 16S rRNA gene sequences were PCR amplified from DNA extracted from highly purified preparations of cells that were morphologically identified as A. oxaliferumpresent in freshwater sediments from three locations in northern England (Rydal Water, Jenny Dam, Hell Kettles). Cloning and sequence analysis of the PCR-amplified 16S rRNA genes revealed that multiple related but divergent sequences were routinely obtained from theA. oxaliferum communities present in all the sediments examined. Whole-cell in situ hybridization with combinations of fluorescence-labelled oligonucleotide probes revealed that the divergent sequences recovered from purified A. oxaliferumcells corresponded to genetically distinct Achromatiumsubpopulations. Analysis of the cell size distribution of the genetically distinct subpopulations demonstrated that each was also morphologically distinct. Furthermore, there was a high degree of endemism in the Achromatium sequences recovered from different sediments; identical sequences were never recovered from different sampling locations. In addition to ecological differences that were apparent between Achromatium communities from different freshwater sediments, the distribution of different subpopulations of Achromatium in relation to sediment redox profiles indicated that the genetically and morphologically distinct organisms that coexisted in a single sediment were also ecologically distinct and were adapted to different redox conditions. This result suggests that Achromatium populations have undergone adaptive radiation and that the divergent Achromatiumspecies occupy different niches in the sediments which they inhabit.
7

Gray, N. D., R. Howarth, R. W. Pickup, J. Gwyn Jones e I. M. Head. "Use of Combined Microautoradiography and Fluorescence In Situ Hybridization To Determine Carbon Metabolism in Mixed Natural Communities of Uncultured Bacteria from the GenusAchromatium". Applied and Environmental Microbiology 66, n. 10 (1 ottobre 2000): 4518–22. http://dx.doi.org/10.1128/aem.66.10.4518-4522.2000.

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ABSTRACT Combined microautoradiography and fluorescence in situ hybridization (FISH) was used to investigate carbon metabolism in uncultured bacteria from the genus Achromatium. All of theAchromatium species identified in a freshwater sediment from Rydal Water, Cumbria, United Kingdom, which were distinguishable only by FISH, assimilated both [14C]bicarbonate and [14C]acetate. This extends previous findings thatAchromatium spp. present at another location could only utilize organic carbon sources. Achromatium spp., therefore, probably exhibit a range of physiologies, i.e., facultative chemolithoautotrophy, mixotrophy, and chemoorganoheterotrophy, similar to other large sulfur bacteria (e.g., Beggiatoa spp.).
8

Babenzien, Hans-Dietrich. "Achromatium oxaliferum and its ecological niche". Zentralblatt für Mikrobiologie 146, n. 1 (1991): 41–49. http://dx.doi.org/10.1016/s0232-4393(11)80258-1.

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9

Glöckner, Frank Oliver, Hans-Dietrich Babenzien, Jörg Wulf e Rudolf Amann. "Phylogeny and Diversity of Achromatium oxaliferum". Systematic and Applied Microbiology 22, n. 1 (febbraio 1999): 28–38. http://dx.doi.org/10.1016/s0723-2020(99)80025-3.

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10

Head, Ian M., Neil D. Gray, Hans-Dietrich Babenzien e Frank Oliver Glöckner. "Uncultured giant sulfur bacteria of the genus Achromatium". FEMS Microbiology Ecology 33, n. 3 (settembre 2000): 171–80. http://dx.doi.org/10.1111/j.1574-6941.2000.tb00739.x.

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11

Díaz, J. A., M. Irlbauer e J. A. Martínez. "Diffractive-refractive hybrid doublet to achromatize the human eye". Journal of Modern Optics 51, n. 14 (settembre 2004): 2223–34. http://dx.doi.org/10.1080/09500340408232525.

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Díaz, J. A., M. Irlbauer e J. A. Martínez. "Diffractive-refractive hybrid doublet to achromatize the human eye". Journal of Modern Optics 51, n. 14 (20 settembre 2004): 2223–34. http://dx.doi.org/10.1080/0950034042000265532.

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13

Roux, Claude, Olivier Bricaud, Didier Le Coeur e Javier Etayo. "Les Refractohilum (Hyphomycètes, Moliniacés) à conidies pluriseptées en Europe et au Canada". Canadian Journal of Botany 75, n. 9 (1 settembre 1997): 1592–600. http://dx.doi.org/10.1139/b97-871.

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A comparative study of Refractohilum specimens with pluriseptate conidia from Canada and western Europe shows that they belong to three species: R. achromaticum, known until now only from Canada, Refractohilum intermedium Roux et Etayo sp.nov., known from subhumid parts of southern Europe (Mediterranean areas of France and Spain), and Refractohilum pluriseptatum Etayo et Roux sp.nov., known from western Europe and the most humid parts of southern Europe. These three species, which grow on the thallus of corticolous and often sterile crustose lichens with Trentepohlia, differ from each other by dimensions and septation of conidia and conidiophores, distribution, and ecology. Key words: lichenicolous fungi, Refractohilum, taxonomy.
14

Schorn, Sina, e Heribert Cypionka. "A Crispy Diet: Grazers of Achromatium oxaliferum in Lake Stechlin Sediments". Microbial Ecology 76, n. 3 (28 febbraio 2018): 584–87. http://dx.doi.org/10.1007/s00248-018-1158-4.

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15

Head, I. M., N. D. Gray, K. J. Clarke, R. W. Pickup e J. G. Jones. "The phylogenetic position and ultrastructure of the uncultured bacterium Achromatium oxaliferum". Microbiology 142, n. 9 (1 settembre 1996): 2341–54. http://dx.doi.org/10.1099/00221287-142-9-2341.

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16

Suparjo. "ISOLATION AND CHARACTERIZATION OF SULFUR-OXIDIZING BACTERIA (SOB) FROM WASTE OF RUBBER FACTORY AND PAPER IN JAMBI". International Journal of Ecophysiology 1, n. 2 (31 agosto 2019): 131–39. http://dx.doi.org/10.32734/ijoep.v1i2.1276.

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Sewage contains high concentration of sulfate and contaminates ground water supply. The production process in the factory produced sewage containing high amount of sulfur such as sulphide and sulphate. Sulfur bacteria, which are capable of oxidizing, reducing or partially oxidizing inorganic sulfur compounds such as Thiomicrospira, Thiothrix, Desulforomonas, Achromatium, and a group of Thiobacillus. Utilization of sulfur bacteria has done in attemp to find sewage bioremediation agents as well as to promote soil fertility. Isolation and characterization were carried out by growing the bacteria in the starkey selective medium, including pH reduction test, morphology, physiology and biochemical characterization. It has been observed that out of 2 isolates from different sources of samples (rubber and paper sewage), only one isolates related to sulfur-oxidizing bacterium (SOB) while the isolates AE01 related to true sulfur-oxidizing bacterium in genus Thiobacillus.
17

Salman, Verena, Tingting Yang, Tom Berben, Frieder Klein, Esther Angert e Andreas Teske. "Calcite-accumulating large sulfur bacteria of the genus Achromatium in Sippewissett Salt Marsh". ISME Journal 9, n. 11 (24 aprile 2015): 2503–14. http://dx.doi.org/10.1038/ismej.2015.62.

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18

Yang, Tingting, Andreas Teske, Wallace Ambrose, Verena Salman-Carvalho, Robert Bagnell e Lars Peter Nielsen. "Intracellular calcite and sulfur dynamics of Achromatium cells observed in a lab-based enrichment and aerobic incubation experiment". Antonie van Leeuwenhoek 112, n. 2 (7 settembre 2018): 263–74. http://dx.doi.org/10.1007/s10482-018-1153-2.

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19

Gray, Neil D., Daria Comaskey, Ian P. Miskin, Roger W. Pickup, Keiko Suzuki e Ian M. Head. "Adaptation of sympatric Achromatium spp. to different redox conditions as a mechanism for coexistence of functionally similar sulphur bacteria". Environmental Microbiology 6, n. 7 (luglio 2004): 669–77. http://dx.doi.org/10.1111/j.1462-2920.2004.00607.x.

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Gray, N. D., R. W. Pickup, J. G. Jones e I. M. Head. "Ecophysiological Evidence that Achromatium oxaliferum Is Responsible for the Oxidation of Reduced Sulfur Species to Sulfate in a Freshwater Sediment." Applied and environmental microbiology 63, n. 5 (1997): 1905–10. http://dx.doi.org/10.1128/aem.63.5.1905-1910.1997.

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21

Maksimovic, S., e B. Jakovljevic. "The signet ring cell melanoma-rare morphologic variant of melanoma: Case report". Journal of Clinical Oncology 27, n. 15_suppl (20 maggio 2009): e20020-e20020. http://dx.doi.org/10.1200/jco.2009.27.15_suppl.e20020.

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e20020 Background: Melanoma is a malignant tumor of melanocytes of skin. The histopathological variants of malignant melanoma include the common type (lentigo maligna (5%), superficial spreading melanoma (65%), nodular melanoma (15%), acrolentiginous melanoma (5%). The signet ring cell melanoma is a rare form melanoma, being seen in some 0.5% of melanomas. Aim of work: That showed young women with signet ring cell melanoma is a rare form melanoma. Methods: We describe a 39-year-old patient with a primary signet-ring cell melanoma of the skin located on the left upper quadrant of abdominal wall. Results: Diagnosis the tumour of skin was in department of surgery and histhopatology in General hospital in Bijeljini in December of the 2007. We performed clinical and histhopatologic examination. Physical examination revealed a well circumscribed and firm mass measuring 150x 100x 80 mm of the skin located on the upper quadrant of abdominal wall and solid mass in pelvis. Because of high suspect melanoma in patient performed surgical excision of skin tumor. Pathohysthology diagnosis was: Melanoma nodularis achromaticum. Immunohistochemistry showed positive reaction of the tumor cells for S-100, HMB-45 protein and vimentin, confirming their melanocytic differentiation. Tumor cells were negative for cytokeratins, epithelial membrane antigen (EMA), and carcinoembryonic antigen (CEA). After immunohistochemistry analysis definitive pathohystology was: Signet ring cell melanoma. The signet-ring cell melanoma disclosed an invasion to Clark Level V and tumor thickness Breslow level III. Tumor from pelvis was appertain uterus and histopathologic diagnosis is a leomyoma. Conclusions: Signet-ring cell melanoma is a rare morphologic variant of melanoma. Its recognition is important for differentiation from other tumors featuring signet ring cells. No significant financial relationships to disclose.
22

STAVRESCU-BEDIVAN, Mala Maria, Emilia Brindusa SANDULESCU, Catalin Mihai CROITORU, Roxana Maria MADJAR, Oana Alina BOIU-SICUIA e Gina VASILESCAETEANU. "A PRELIMINARY EVALUATION OF WATER QUALITY RELATED TO AQUATIC ORGANISMS IN COMANA POND". AgroLife Scientific Journal 10, n. 2 (31 dicembre 2021): 178–88. http://dx.doi.org/10.17930/agl2021222.

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In the protected area Natural Park Comana located in Giurgiu County, a survey was carried out between April and June 2021, in order to analyze the water quality related to the aquatic diversity. In the samples collected from Comana Pond, several representatives belonging to four kingdoms were identified: Bacteria (blue-green algae, bacteria), Protista (single-celled and colonial green algae, diatoms, euglenoid flagellates, ciliates), Plantae (filamentous green algae, aquatic freshwater plants) and Animalia (European perch, rudd, pike, Prussian carp). Plankton organisms Achromatium sp., Merismopedia sp., Spirilla sp., Spirulina sp. (bacteria); Gomphonema sp., Melosira sp., Paramecium caudatum (chromists); Desmococcus sp, Ulothrix sp., Volvox sp. (chlorophyte green algae) and also the parasitic nematode Philometroides sanguineus were mentioned for the first time in the Comana Pond. A biometric analysis was performed on a total number of 91 Carassius gibelio individuals and negative pattern of growth and also a fish well-being were postulated. The parasite P. sanguineus was detected in the caudal fin of two Prussian carp individuals. Water samples were collected from 7 sampling points (SP) and were subjected to physico-chemical analysis. It were determined the following parameters: pH, electrical conductivity (EC), total hardness (TH), chemical oxygen demand (COD), phosphate phosphorus (P-PO<sub<4</sub<<sup<3-</sup<), nitrate nitrogen (N-NO<sub<3</sub<<sup<-</sup<), nitrite nitrogen (N-NO<sub<2</sub<<sup<-</sup<). Generally, it was concluded that Comana Pond is a dynamic ecosystem that meets favorable conditions for the growth and development of aquatic organisms.
23

Ionescu, Danny, Luca Zoccarato, Artur Zaduryan, Sina Schorn, Mina Bizic, Solvig Pinnow, Heribert Cypionka e Hans-Peter Grossart. "Heterozygous, Polyploid, Giant Bacterium, Achromatium, Possesses an Identical Functional Inventory Worldwide across Drastically Different Ecosystems". Molecular Biology and Evolution, 10 novembre 2020. http://dx.doi.org/10.1093/molbev/msaa273.

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Abstract Achromatium is large, hyperpolyploid and the only known heterozygous bacterium. Single cells contain approximately 300 different chromosomes with allelic diversity far exceeding that typically harbored by single bacteria genera. Surveying all publicly available sediment sequence archives, we show that Achromatium is common worldwide, spanning temperature, salinity, pH, and depth ranges normally resulting in bacterial speciation. Although saline and freshwater Achromatium spp. appear phylogenetically separated, the genus Achromatium contains a globally identical, complete functional inventory regardless of habitat. Achromatium spp. cells from differing ecosystems (e.g., from freshwater to saline) are, unexpectedly, equally functionally equipped but differ in gene expression patterns by transcribing only relevant genes. We suggest that environmental adaptation occurs by increasing the copy number of relevant genes across the cell’s hundreds of chromosomes, without losing irrelevant ones, thus maintaining the ability to survive in any ecosystem type. The functional versatility of Achromatium and its genomic features reveal alternative genetic and evolutionary mechanisms, expanding our understanding of the role and evolution of polyploidy in bacteria while challenging the bacterial species concept and drivers of bacterial speciation.
24

Schorn, Sina, Verena Salman-Carvalho, Sten Littmann, Danny Ionescu, Hans-Peter Grossart e Heribert Cypionka. "Cell Architecture of the Giant Sulfur Bacterium Achromatium oxaliferum: Extra-cytoplasmic Localization of Calcium Carbonate Bodies". FEMS Microbiology Ecology 96, n. 2 (24 dicembre 2019). http://dx.doi.org/10.1093/femsec/fiz200.

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ABSTRACT Achromatium oxaliferum is a large sulfur bacterium easily recognized by large intracellular calcium carbonate bodies. Although these bodies often fill major parts of the cells’ volume, their role and specific intracellular location are unclear. In this study, we used various microscopy and staining techniques to identify the cell compartment harboring the calcium carbonate bodies. We observed that Achromatium cells often lost their calcium carbonate bodies, either naturally or induced by treatments with diluted acids, ethanol, sodium bicarbonate and UV radiation which did not visibly affect the overall shape and motility of the cells (except for UV radiation). The water-soluble fluorescent dye fluorescein easily diffused into empty cavities remaining after calcium carbonate loss. Membranes (stained with Nile Red) formed a network stretching throughout the cell and surrounding empty or filled calcium carbonate cavities. The cytoplasm (stained with FITC and SYBR Green for nucleic acids) appeared highly condensed and showed spots of dissolved Ca2+ (stained with Fura-2). From our observations, we conclude that the calcium carbonate bodies are located in the periplasm, in extra-cytoplasmic pockets of the cytoplasmic membrane and are thus kept separate from the cell's cytoplasm. This periplasmic localization of the carbonate bodies might explain their dynamic formation and release upon environmental changes.
25

Ionescu, Danny, Luca Zoccarato e Sina Schorn. "When it comes to the giant bacterium Achromatium, everything is everywhere". TheScienceBreaker 08, n. 01 (28 gennaio 2022). http://dx.doi.org/10.25250/thescbr.brk613.

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Salman, Verena, Tom Berben, Robert M. Bowers, Tanja Woyke, Andreas Teske e Esther R. Angert. "Insights into the single cell draft genome of “Candidatus Achromatium palustre”". Standards in Genomic Sciences 11, n. 1 (23 marzo 2016). http://dx.doi.org/10.1186/s40793-016-0146-x.

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Benzerara, Karim, Romain Bolzoni, Caroline Monteil, Olivier Beyssac, Olivier Forni, Béatrice Alonso, Maria P. Asta e Christopher Lefevre. "The gammaproteobacterium Achromatium forms intracellular amorphous calcium carbonate and not (crystalline) calcite". Geobiology, 21 dicembre 2020. http://dx.doi.org/10.1111/gbi.12424.

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28

Ionescu, Danny, Mina Bizic-Ionescu, Nicola De Maio, Heribert Cypionka e Hans-Peter Grossart. "Community-like genome in single cells of the sulfur bacterium Achromatium oxaliferum". Nature Communications 8, n. 1 (6 settembre 2017). http://dx.doi.org/10.1038/s41467-017-00342-9.

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29

Mansor, Muammar, Trinity L. Hamilton, Matthew S. Fantle e Jennifer L. Macalady. "Metabolic diversity and ecological niches of Achromatium populations revealed with single-cell genomic sequencing". Frontiers in Microbiology 6 (10 agosto 2015). http://dx.doi.org/10.3389/fmicb.2015.00822.

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