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Journal articles on the topic 'Opalina'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Wang, Run-qiu, Wei-shan Zhao, Guang-ran Hu, Francisco Ponce-Gordo, Hong Zou, Wen-xiang Li, Shan-gong Wu, Gui-tang Wang, and Ming Li. "Redescription of Opalina triangulata (Heterokonta, Opalinea) from Fejervarya limnocharis based on morphological and molecular data." European Journal of Protistology 71 (October 2019): 125639. http://dx.doi.org/10.1016/j.ejop.2019.125639.

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2

Chae, Jinho, and Shuhei Nishida. "Swimming behaviour and photoresponses of the iridescent copepods, Sapphirina gastrica and Sapphirina opalina (Copepoda: Poecilostomatoida)." Journal of the Marine Biological Association of the United Kingdom 84, no. 4 (August 2004): 727–31. http://dx.doi.org/10.1017/s0025315404009816h.

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The swimming behaviour and photoresponses of the iridescent epipelagic copepods, Sapphirina gastrica and S. opalina were investigated in the laboratory. In continuous dark conditions, both species showed no significant diel variation in their swimming activities. When stimulated with light, they exhibited spiral-swimming in which the males showed a significantly higher speed and frequency of turning than the females. Both sexes of S. gastrica and S. opalina showed positive phototaxis at intensities higher than 0·05×1014 quanta cm−2 s−1 for light sources of 430 nm and 580 nm. Sapphirina gastrica showed increased locomotion over a broad range of wavelengths from 430 nm to 580 nm, while S. opalina showed a gradual increase of activity with decreasing wavelength, with the highest value at 430 nm. The photoresponses of these two species suggest that light conditions play an important role in their daytime ascent and in determining the depth distributions that were observed in our previous study. It is suggested that the iridescence and fast spiral-swimming of males, and the species-specific photoresponses of both sexes constitute a putative mate recognition system in the open ocean.

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3

Zhao, Weishan, Guangran Hu, Francisco Ponce-Gordo, Hong Zou, Wenxiang Li, Shangong Wu, Ming Li, and Guitang Wang. "Morphological description of Opalina obtrigonoidea Metcalf, 1923 (Heterokonta, Opalinea) from Duttaphrynus melanostictus and evaluation of the ITS region as a suitable genetic marker for inter-species identification in Opalina." Parasitology International 76 (June 2020): 102103. http://dx.doi.org/10.1016/j.parint.2020.102103.

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4

Affa'a, Félix-Marie, Jean-Pierre Mignot, and Jean-Louis Amiet. "Morphological and cytological observations on two opalinid endocommensals of Acanthixalus spinosus (Amphibia, Anura)." Canadian Journal of Zoology 74, no. 8 (August 1, 1996): 1573–84. http://dx.doi.org/10.1139/z96-171.

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The morphology and cytology of two new opalinid species were studied using silver impregnation and fixation, which preserves the microfibrils. Both species, commensal on Acanthixalus spinosus, are host-specific. Light microscopy showed the existence of a posterior secant system in Opalina proteus n.sp. and its absence in Cepedea couillardi n.sp. (in agreement with the differences presently recognised between the two genera). At the ultrastructural level, however, both species present a posterior fibrillar zone that seems to be homologous with the secant system. This apparent contradiction may be explained by the fact that the secant system is visible under light microscopy only in O. proteus because its fibrillar zone is more developed than in C. couillardi. The life cycle of C. couillardi spans stages from the tadpole to the adult; in contrast, O. proteus completes its cycle before metamorphosis of the host.

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5

Delvinquier, B. L. J., M. B. Markus, and N. I. Passmore. "Opalinidae in African Anura I. Genus Opalina." Systematic Parasitology 19, no. 2 (June 1991): 119–46. http://dx.doi.org/10.1007/bf00009908.

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6

SMITH, GIDEON F., ESTRELA FIGUEIREDO, and STEVEN MOLTENO. "A new combination in Tulista, T. minor (Alooideae, Asphodelaceae)." Phytotaxa 346, no. 2 (April 4, 2018): 201. http://dx.doi.org/10.11646/phytotaxa.346.2.8.

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Tulista Rafinesque (1840: 137) is the smallest of the three haworthioid genera recognised in the Asphodelaceae subfam. Alooideae, and widely considered to include four, or five, species [depending on whether T. opalina (Hayashi 2001: 17) Breuer (2016: 7) is accepted] (Smith et al. 2017).

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7

SONDHI, SANJAY, DIPENDRA NATH BASU, YASH SONDHI, and KRUSHNAMEGH KUNTE. "A new species of Metallolophia Warren, 1895 (Lepidoptera: Geometridae: Geometrinae), and notes on M. opalina (Warren, 1893), from eastern Himalaya, India." Zootaxa 4838, no. 2 (August 26, 2020): 289–97. http://dx.doi.org/10.11646/zootaxa.4838.2.9.

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A new species, Metallolophia taleensis, sp. nov., is described and illustrated from Tale Wildlife Sanctuary, Lower Subansiri District, Arunachal Pradesh, India, based on male specimens. A second species, Metallolophia opalina (Warren, 1893), is recorded from India after more than a century, extending its range eastwards into Arunachal Pradesh, India.

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8

Chae, Jinho, and Shuhei Nishida. "Spectral patterns of the iridescence in the males of Sapphirina (Copepoda: Poecilostomatoida)." Journal of the Marine Biological Association of the United Kingdom 79, no. 3 (June 1999): 437–43. http://dx.doi.org/10.1017/s0025315498000563.

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Spectral reflectivity and transmission of the iridescent cuticle of six species of male Sapphirina (Poecilostomatoida: Copepoda) were measured by microspectrophotometry. Sapphirina angusta and S. opalina showed two spectral peaks of reflection, one at about 420 nm and the other at wavelengths longer than 750 nm. Sapphirina auronitens and S. gastrica had dominant peaks at wavelengths longer than 500 nm. Sapphirina ovatolanceolata had peaks between 430 and 600 nm, while S. metallina had various peaks along a wide range of wavelengths. The peaks at the longer wavelength in S. angusta and S. opalina may be related to the red pigments in the subcuticular layer of the species, or a result of a second-order effect of the multilayer system. The spectra of transmitted light were complementary to those of reflected light, indicating that the iridescence is caused by the interference of light by the integumental multilayer structure. The present results are also consistent with the hypothesis that the iridescence has a role in increasing the contrast of males against the ambient light conditions in the daytime distributional depth of the species.

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9

Hanamura, Kentarou, and Hiroshi Endoh. "Binary Fission and Encystation of Opalina sp. in Axenic Medium." Zoological Science 18, no. 3 (April 2001): 381–87. http://dx.doi.org/10.2108/zsj.18.381.

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10

Woolley, David M. "Newly discovered linkages between the cortical (pellicular) ridges of Opalina." European Journal of Protistology 42, no. 4 (November 2006): 309–11. http://dx.doi.org/10.1016/j.ejop.2006.08.002.

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11

Andrade, Bruno Garcia, Paulo Márcio Santos Costa, and Alexandre Dias Pimenta. "Taxonomic review of the genus Opaliopsis (Gastropoda: Nystiellidae) from Brazil, with description of a new species." Journal of the Marine Biological Association of the United Kingdom 91, no. 7 (February 28, 2011): 1561–66. http://dx.doi.org/10.1017/s0025315411000026.

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The genus Opaliopsis from Brazil is revised based on three deep-water species. Opaliopsis atlantis (Clench & Turner, 1952) is confirmed as occurring in north-eastern and south-eastern localities. Opaliopsis opalina (Dall, 1927) is reported for the first time in the south-western Atlantic. A new species, Opaliopsis cearense, is described from the north-eastern Brazilian coast, and is distinguished by its large number of fine spiral cords per teleoconch whorl.

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12

Bland, T. "XIV.-On Proserpina Opalina C. B. Ad., and Helix Proserpinula Pfr." Annals of The Lyceum of Natural History of New York 6, no. 1 (May 22, 2009): 77–78. http://dx.doi.org/10.1111/j.1749-6632.1858.tb00349.x.

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13

Delvinquier, B. L. J., and S. S. Desser. "Opalinidae (Sarcomastigophora) in North American Amphibia. Genus Opalina Purkinje & Valentin, 1835." Systematic Parasitology 33, no. 1 (January 1996): 33–51. http://dx.doi.org/10.1007/bf00009719.

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14

Yubuki, Naoji, Luis Javier Galindo, Guillaume Reboul, Purificación López-García, Matthew W. Brown, Nicolas Pollet, and David Moreira. "Ancient Adaptive Lateral Gene Transfers in the Symbiotic Opalina–Blastocystis Stramenopile Lineage." Molecular Biology and Evolution 37, no. 3 (November 6, 2019): 651–59. http://dx.doi.org/10.1093/molbev/msz250.

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Abstract Lateral gene transfer is a very common process in bacterial and archaeal evolution, playing an important role in the adaptation to new environments. In eukaryotes, its role and frequency remain highly debated, although recent research supports that gene transfer from bacteria to diverse eukaryotes may be much more common than previously appreciated. However, most of this research focused on animals and the true phylogenetic and functional impact of bacterial genes in less-studied microbial eukaryotic groups remains largely unknown. Here, we have analyzed transcriptome data from the deep-branching stramenopile Opalinidae, common members of frog gut microbiomes, and distantly related to the well-known genus Blastocystis. Phylogenetic analyses suggest the early acquisition of several bacterial genes in a common ancestor of both lineages. Those lateral gene transfers most likely facilitated the adaptation of the free-living ancestor of the Opalinidae–Blastocystis symbiotic group to new niches in the oxygen-depleted animal gut environment.

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15

De Baltezan, Maiara Martins, Amaury Garcia Moreira Dos Santos, and Leonardo Paz Deble. "Cypella hauthalii (Kuntze) Foster subsp. opalina Ravenna nueva cita para el Paraguay." Balduinia, no. 65 (December 20, 2019): 35–39. http://dx.doi.org/10.5902/2358198041603.

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16

SANBORN, ALLEN F., THOMAS E. MOORE, and ALLEN M. YOUNG. "Two new cicada species from Costa Rica (Hemiptera: Cicadomorpha: Cicadidae) with a key to the species of Fidicinoides in Costa Rica." Zootaxa 1846, no. 1 (August 11, 2008): 1. http://dx.doi.org/10.11646/zootaxa.1846.1.1.

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The Neotropical cicadas Fidicinoides coffea Sanborn, Moore and Young and Fidicinoides guayabana Sanborn, Moore and Young are described as new species. This work validates the names previously assigned to these species which had been considered nomina nuda. Comparisons are made to other members of the genus found in Costa Rica. A summary of the biology of each new species is provided. The following new combinations, all for species formerly included in Fidicina, are proposed: Fidicinoides brisa (Walker 1850), F. cachla Distant 1899, F. flavibasalis Distant 1905, F. fumea Distant 1883, F. glauca Goding 1925, F. opalina (Germar 1821), F. passerculus (Walker 1850), F. sericans Stål 1854, F. spinicosta (Walker 1850), F. steindachneri Kuhlgatz & Melichar 1902, F. variegata Sanborn 2005, and F. viridifemur (Walker 1850). A key to the Costa Rican species of Fidicinoides is provided.

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17

Silva, Rolf Junior Ferreira, and Raimunda Conceição de Vilhena Potiguara. "Substâncias ergásticas foliares de espécies amazônicas de Oenocarpus Mart. (Arecaceae): caracterização histoquímica e ultra-estrutural." Acta Amazonica 39, no. 4 (2009): 793–98. http://dx.doi.org/10.1590/s0044-59672009000400007.

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O presente estudo teve por objetivo diagnosticar e caracterizar as substâncias ergásticas foliares de Oenocarpus bacaba Mart., O. distichus Mart., O. mapora H. Karst. e O. minor Mart. através de microscopias óptica e eletrônica de varredura, análises histoquímicas e microanálises físicas. Secções transversais e longitudinais, assim como maceração foram realizadas em material botânico fixado. As análises histoquímicas foram empregadas em material botânico in natura, seguindo-se protocolos específicos para mucilagem, amido e sílica. Microanálises físicas foram feitas com Energy Dispersive Spectroscopy (EDS) detector. Nas espécies estudadas de Oenocarpus Mart., as substâncias ergásticas foliares correspondem a mucilagem amorfa; grãos de amido poliédricos do tipo simples e sílica opalina sob a forma de corpos elípticos e esféricos-globosos de superfície espiculada, ambos com elevado teor de dióxido de silício. As observações microscópicas, os testes histoquímicos e as microanálises físicas permitiram diagnosticar, caracterizar e elucidar a estrutura e ultra-estrutura das substâncias ergásticas ocorrentes nas folhas dos táxons analisados de Oenocarpus Mart.

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18

SMITH, GIDEON F., ESTRELA FIGUEIREDO, and STEVEN MOLTENO. "A new combination in Tulista, T. kingiana (Asphodeloideae, Xanthorrhoeaceae / Alooideae, Asphodelaceae)." Phytotaxa 297, no. 3 (March 1, 2017): 285. http://dx.doi.org/10.11646/phytotaxa.297.3.8.

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Phylogenetic studies in the Xanthorrhoeaceae subfam. Asphodeloideae (alternatively Asphodelaceae subfam. Alooideae) (Treutlein et al. 2003a, b; Grace et al. 2013; Manning et al. 2014) indicated that the genus Haworthia Duval (1809: 7) sensu lato should be split into three genera. The three haworthioid genera established and widely accepted for the three groups of species are: Haworthia sensu stricto, Haworthiopsis Rowley (2013: 4), and Tulista Rafinesque (1840: 137). In terms of number of species, Tulista is the smallest of the three genera and is widely considered to include five species. For four of these, T. marginata (Lamarck 1783: 89) Rowley (2013: 6), T. minima (Aiton 1789: 468) Boatwright & Manning in Manning et al. (2014: 70), T. opalina (Hayashi 2001: 17) Breuer (2016: 7), and T. pumila (Linnaeus 1753: 322) Rowley (2013: 6), combinations have been validly published. However, for the fifth species, Haworthia kingiana Von Poellnitz (1937: 203), a valid combination has yet to be published in Tulista. We do so here.

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19

Affa’a, Félix-Marie. "A propos des critères de séparation des genres d’Opalines: Protoopalina Metcalf, 1918, Cepedea Metcalf, 1920 et Opalina (Purkinje et Valentin, 1835)." Archiv für Protistenkunde 141, no. 4 (June 1992): 304–14. http://dx.doi.org/10.1016/s0003-9365(11)80059-x.

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20

Mignot, Jean-Pierre, and Felix-Marie Affa'a. "Patterning in Opalinids.III.The Cytoskeleton of Cepedea sudafricana (FANTHAM, 1923) AFFA'A & LYNN 1994, an Intermediate Type between Opalina ranarum and Protoopalina pseudonutti." Archiv für Protistenkunde 145, no. 3-4 (April 1995): 241–49. http://dx.doi.org/10.1016/s0003-9365(11)80319-2.

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21

Burakova, A. V., and E. A. Malkova. "Species composition of parasites Rana temporaria Linnaeus, 1758 (Amphibia: Ranidae) in the vicinity of the Visim State Nature Biosphere Reserve." Russian Journal of Parasitology 15, no. 1 (March 11, 2021): 16–24. http://dx.doi.org/10.31016/1998-8435-2021-15-1-16-24.

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The purpose of the research is to study the parasite fauna of the common frog (Rana temporaria Linnaeus, 1758) inhabiting the vicinity of the Visim Nature Biosphere Reserve.Materials and methods. The species composition, dominance structure and endoparasite infection of 32 individuals of R. temporaria caught along the banks of the upper reaches of the Sulem Riverwere assessed according to the following indicators: the prevalence and intensity of infection and abundance index.Results and discussion. The species composition of parasites in a common frog from the vicinity of the Visim Nature Biosphere Reserve is presented for the first time. Five species of macroparasites have been identified, classified as Nematoda: Oswaldocruzia filiformis (Goeze, 1782), Neoraillietnema praeputiale (Skrjabin, 1916), Cosmocerca ornata (Dujardin, 1845), Rhabdias bufonis (Schrank, 1788) and as Platyhelminthes: Haplometra cylindracea (Zeder, 1800). One species of endosymbiotic protozoa of Chromista, Opalina ranarum was recorded (Purkinje et Valentin, 1835). The prevalence of the infection of common frogs by helminths reaches 100%, the abundance index is 11.06, and protozoa is 93.8% and 62.16, respectively. Nematodes O. filiformis (the prevalence of infection 96.9%, and abundance index 7.97) and R. bufonis (the prevalence of infection 46.9%, abundance index 2.28) predominate. It was shown that nematode N. praeputiale was not found in the parasitocenosis of immature amphibians, and trematode H. cylindracea was not found in adult animals. The proportion of O. filiformis and C. ornata increases with age in common frogs. It was found that the animals of the July population are infected with nematode R. bufonis largely. Regardless of the age of R. temporaria, the probability of colonization by O. ranarum in spring will be higher.

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22

BROWN, LEONARD, and BRET RAINES. "Two new records of Epitoniidae from Easter Island, Chile." Zootaxa 402, no. 1 (January 12, 2004): 1. http://dx.doi.org/10.11646/zootaxa.402.1.1.

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While dredging off the coast of Easter Island, two species of Epitoniidae were discovered, which have not been previously reported, Epitonium (Parviscala) deificum (Melvill & Standen, 1903), a species previously known from the Red Sea, Gulf of Oman and Hawaii, and Opalia (Opalia) sumatrensis (Thiele, 1925) a species previously known from Padang, Sumatra, and are the first epitoniids to be reported from the island in nearly twenty-five years.

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23

Bustillo, María A., R. García, and María V. García Pérez. "Caracterización y respuesta al tratamiento térmico de rocas silíceas opalinas." Boletín de la Sociedad Española de Cerámica y Vidrio 39, no. 6 (December 30, 2000): 741–46. http://dx.doi.org/10.3989/cyv.2000.v39.i6.775.

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24

PYRCZ, TOMASZ W., JADWIGA LORENC-BRUDECKA, PIERRE BOYER, and ANNA ZUBEK. "Subspecies-level systematics and affinities of Cheimas Thieme—an endemic genus of the subparamo of the Venezuelan Cordillera de Mérida (Lepidoptera: Nymphalidae, Satyrinae)." Zootaxa 4422, no. 2 (May 23, 2018): 219. http://dx.doi.org/10.11646/zootaxa.4422.2.4.

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The validity of the monobasic neotropical butterfly genus Cheimas Thieme (Nymphalidae, Satyrinae, Satyrini, Pronophilina) is discussed, and confirmed based on morphological and molecular data. Cheimas opalinus (Staudinger), endemic to the Venezuelan Cordillera de Mérida, and considered prior to this study to be monotypic and restricted to the central part of the range, is demonstrated to be polytypic and more widely distributed. Five subspecies are recognised, differing mostly in their dorsal patterns, in particular the shape and colour of hindwing greenish–blue patch. Mitochondrial DNA sequences (COI) were obtained for three of them. The nominate subspecies is found in the central part of the range, in the Sierra Nevada and La Culata. The other subspecies are found as follows: C. opalinus dominici n. ssp.; in the Santo Domingo valley in the centre-north; C. opalinus cristalinus n. ssp. in the north; C. opalinus iosephi n. ssp. on the eastern slopes, and C. opalinus rosalinus n. ssp. in the southern Páramo El Batallón massif. A hybrid zone between the latter two subspecies was detected in the northern part of the Batallón massif based on unusual individual variation and intermediate phenotypes. All the populations of Cheimas opalinus occur in the forest–paramo ecotone at 2800–3400 m a.s.l., with the notable exception of C. opalinus cristalinus n. ssp. found also in mid-elevation forests down to 2300 m a.s.l.

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25

Stepanova, A., and W. Ch Marsch. "Plaques opalines." Der Hautarzt 57, no. 6 (June 2006): 514–17. http://dx.doi.org/10.1007/s00105-005-0992-8.

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26

Ahles, Marcus, Tilmann Ruhl, Goetz P. Hellmann, Holger Winkler, Roland Schmechel, and Heinz von Seggern. "Spectroscopic ellipsometry on opaline photonic crystals." Optics Communications 246, no. 1-3 (February 2005): 1–7. http://dx.doi.org/10.1016/j.optcom.2004.10.050.

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27

Gaillard, Françoise. "Opalka." Médium 5, no. 4 (2005): 148. http://dx.doi.org/10.3917/mediu.005.0148.

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28

Williams, S. T., Y. Kano, A. Warén, and D. G. Herbert. "Marrying molecules and morphology: first steps towards a reevaluation of solariellid genera (Gastropoda: Trochoidea) in the light of molecular phylogenetic studies." Journal of Molluscan Studies 86, no. 1 (February 2020): 1–26. http://dx.doi.org/10.1093/mollus/eyz038.

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ABSTRACT The assignment of species to the vetigastropod genus Solariella Wood, 1842, and therefore the family Solariellidae Powell, 1951, is complicated by the fact that the type species (Solariella maculata Wood, 1842) is a fossil described from the Upper Pliocene. Assignment of species to genera has proved difficult in the past, and the type genus has sometimes acted as a ‘wastebasket’ for species that cannot easily be referred to another genus. In the light of a new systematic framework provided by two recent publications presenting the first molecular phylogenetic data for the group, we reassess the shell characters that are most useful for delimiting genera. Shell characters were previously thought to be of limited taxonomic value above the species level, but this is far from the case. Although overall shell shape is not a reliable character, our work shows that shell characters, along with radular and anatomical characters, are useful for assigning species to genera. Sculpture of the early teleoconch (the region immediately following the protoconch) and the columella are particularly useful characters that have not been used regularly in the past to distinguish genera. However, even with the combination of all morphological characters used in this study (shell, radular and eye), a few species are still difficult to assign to genera and in such cases molecular systematic data are essential. In the present study, we discuss 13 genera—12 of which were recovered as well-supported clades in recent molecular systematic studies—and provide morphological characters to distinguish them. We describe several new taxa: Chonospeira n. gen. (referred to as ‘clade B’ in previous molecular systematic studies), Phragmomphalina n. gen. (Bathymophila in part in molecular systematic studies) and Phragmomphalina vilvensi n. sp. (type species of Phragmomphalina n. gen.). We synonymize Hazuregyra Shikama, 1962 with Minolia A. Adams, 1860, Minolia subangulata Kuroda & Habe, 1952 with Minolia punctata A. Adams, 1860 and M. gemmulata Kuroda & Habe, 1971 with M. shimajiriensis (MacNeil, 1960). We also present the following new combinations: Bathymophila bairdii (Dall, 1889), B. dawsoni (Marshall, 1979), B. regalis (Marshall, 1999), B. wanganellica (Marshall, 1999), B. ziczac (Kuroda & Habe in Kuroda, Habe & Oyama, 1971), Chonospeira nuda (Dall, 1896), C. iridescens (Habe, 1961), C. ostreion (Vilvens, 2009), C. strobilos (Vilvens, 2009), Elaphriella corona (Lee & Wu, 2001), E. diplax (Marshall, 1999), E. meridiana (Marshall, 1999), E. olivaceostrigata (Schepman, 1908), E. opalina (Shikama & Hayashi, 1977), Ilanga norfolkensis (Marshall, 1999), I. ptykte (Vilvens, 2009), I. zaccaloides (Vilvens, 2009), Minolia shimajiriensis (MacNeil, 1960), M. watanabei (Shikama, 1962), Phragmomphalina alabida (Marshall, 1979), P. diadema (Marshall, 1999), P. tenuiseptum (Marshall, 1999), Spectamen euteium (Vilvens, 2009), S. basilicum (Marshall, 1999), S. exiguum (Marshall, 1999) and S. flavidum (Marshall, 1999).

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29

Philipse, Albert P. "Solid opaline packings of colloidal silica spheres." Journal of Materials Science Letters 8, no. 12 (December 1989): 1371–73. http://dx.doi.org/10.1007/bf00720190.

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30

Milliken, R. E., G. A. Swayze, R. E. Arvidson, J. L. Bishop, R. N. Clark, B. L. Ehlmann, R. O. Green, et al. "Opaline silica in young deposits on Mars." Geology 36, no. 11 (2008): 847. http://dx.doi.org/10.1130/g24967a.1.

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31

Tsareva, E. V., M. F. Pirogova, and Yu A. Spiridonov. "Opacified and opaline enamels on precious metals." Glass and Ceramics 68, no. 11-12 (March 2012): 376–77. http://dx.doi.org/10.1007/s10717-012-9394-4.

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32

Kaufhold, Annette, Matthias Halisch, Gerhard Zacher, and Stephan Kaufhold. "X-ray computed tomography investigation of structures in Opalinus Clay from large-scale to small-scale after mechanical testing." Solid Earth 7, no. 4 (August 3, 2016): 1171–83. http://dx.doi.org/10.5194/se-7-1171-2016.

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Abstract. In the past years X-ray computed tomography (CT) has became more and more common for geoscientific applications and is used from the µm-scale (e.g. for investigations of microfossils or pore-scale structures) up to the dm-scale (full drill cores or soil columns). In this paper we present results from CT imaging and mineralogical investigations of an Opalinus Clay core on different scales and different regions of interest, emphasizing especially the 3-D evaluation and distribution of cracks and their impact on mechanical testing of such material. Enhanced knowledge of the testing behaviour of the Opalinus Clay is of great interest, especially since this material is considered for a long-term radioactive waste disposal and storage facility in Switzerland. Hence, results are compared regarding the mineral (i.e. phase) contrast resolution, the spatial resolution, and the overall scanning speed.With this extensive interdisciplinary scale-down approach it has been possible to characterize the general fracture propagation in comparison to mineralogical and textural features of the Opalinus Clay. Additionally, and as far as we know, a so-called mylonitic zone, located at an intersect of two main fractures, has been observed for the first time for an experimentally deformed Opalinus sample. The multi-scale results are in good accordance to data from naturally deformed Opalinus Clay samples, which enables us to perform systematical research under controlled laboratory conditions. Accompanying 3-D imaging greatly enhances the capability of data interpretation and assessment of such a material.

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De Luxan, M. P., M. I. Sánchez de Rojas, M. Frías, J. Saavedra, M. T. Martín Patino, and F. Madruga. "Influencia de la adición, en diferentes proporciones, de rocas silíceas opalinas al cemento portland." Materiales de Construcción 39, no. 213 (March 30, 1989): 21–32. http://dx.doi.org/10.3989/mc.1989.v39.i213.814.

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Brient, Pierrick. "Opalka, l'infini." Savoirs et clinique 7, no. 1 (2006): 131. http://dx.doi.org/10.3917/sc.007.0131.

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Rigby, J. Keith, and Charles C. Smith. "Microscleres of a Paleocene Geodia from western Alabama." Journal of Paleontology 66, no. 3 (May 1992): 406–13. http://dx.doi.org/10.1017/s0022336000033965.

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Siliceous sterraster microscleres of the choristid demosponge, Geodia Lamarck, 1815, occur in outcrops of the lower Porters Creek Formation (Paleocene) near Moscow Landing on the Tombigbee River in southeastern Sumter County, Alabama. This is the first report of that sponge from the Cretaceous–Tertiary of the Gulf Coastal Plain. The initially opaline spicules have been converted to clinoptilolite, a Na-K-Ca zeolite.

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Bakhia, T., A. E. Baranchikov, V. S. Gorelik, and S. O. Klimonsky. "Local optical spectroscopy of opaline photonic crystal films." Crystallography Reports 62, no. 5 (September 2017): 783–86. http://dx.doi.org/10.1134/s1063774517050029.

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Chaika, Caren, and Jack Dvorkin. "Ultrasonic velocities of opaline rocks undergoing silica diagenesis." Geophysical Research Letters 24, no. 16 (August 15, 1997): 2039–42. http://dx.doi.org/10.1029/97gl01959.

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Prince, Jeffrey S. "Opaline gland ultrastructure in Aplysia californica (Gastropoda: Anaspidea)." Journal of Molluscan Studies 73, no. 2 (May 1, 2007): 199–204. http://dx.doi.org/10.1093/mollus/eym016.

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Romanov, S. G., T. Maka, C. M. Sotomayor Torres, M. Müller, and R. Zentel. "Emission in a SnS2 inverted opaline photonic crystal." Applied Physics Letters 79, no. 6 (August 6, 2001): 731–33. http://dx.doi.org/10.1063/1.1389825.

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Norris, D. J., E. G. Arlinghaus, L. Meng, R. Heiny, and L. E. Scriven. "Opaline Photonic Crystals: How Does Self-Assembly Work?" Advanced Materials 16, no. 16 (August 18, 2004): 1393–99. http://dx.doi.org/10.1002/adma.200400455.

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Herman, Lia Agustine, Chan Hoe Yip, and Chee Cheong Wong. "Opaline Backreflector Coating in Dye-Sensitized Solar Cell." Journal of Nanoscience and Nanotechnology 10, no. 7 (July 1, 2010): 4657–62. http://dx.doi.org/10.1166/jnn.2010.1683.

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Yan, Qingfeng, Lay Kuan Teh, Qi Shao, C. C. Wong, and Yet-Ming Chiang. "Layer Transfer Approach to Opaline Hetero Photonic Crystals." Langmuir 24, no. 5 (March 2008): 1796–800. http://dx.doi.org/10.1021/la702668p.

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Kim, S., B. Yang, S. Hou, J. Lee, and F. Papadimitrakopoulos. "DNA-Assisted Monolayer Immobilization of 2D Opaline Arrays." Advanced Functional Materials 16, no. 12 (August 4, 2006): 1590–98. http://dx.doi.org/10.1002/adfm.200500782.

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44

Gomiero, LM, AG Manzatto, and FMS Braga. "The role of riverine forests for food supply for the omnivorous fish Brycon opalinus Cuvier, 1819 (Characidae) in the Serra do Mar, Southeast Brazil." Brazilian Journal of Biology 68, no. 2 (May 2008): 321–28. http://dx.doi.org/10.1590/s1519-69842008000200013.

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The purpose of this study was to characterize the diet of the fish Brycon opalinus (Characidae) seasonally and locally, allowing for the determination of its food items and trophic relations with the aquatic and terrestrial environments. The study area encompasses three rivers (Paraibuna, Ipiranga and Grande) in the basin of the Paraibuna, southeast Brazil. Twelve monthly collections were made from January to December 2004. The degree of stomachic repletion and of accumulated visceral fat was analyzed, as was the intestinal length in each class of total length. The frequency of occurrence and the degree of food preference (DFP) of the food items of Brycon opalinus were determined by separating the vegetal and animal items, autochthonous and allochthonous, by insect order and vegetal family consumed. The frequency of occurrence of items of animal origin was found to be equivalent to that of vegetal origin, thus characterizing the omnivorism of Brycon opalinus feeding.

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Nguyen, T. S., and A. D. Le. "Development of a constitutive model for a bedded argillaceous rock from triaxial and true triaxial tests." Canadian Geotechnical Journal 52, no. 8 (August 2015): 1072–86. http://dx.doi.org/10.1139/cgj-2013-0323.

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In this work, a constitutive model that predicts the mechanical behaviour of Opalinus clay is developed. The model is based on the theory of plasticity, and takes into consideration the inherent anisotropy due to the existence of bedding planes, hardening behaviour before the peak strength, softening behaviour after the peak, and creep effects. The model was implemented into the equations of pseudostatic equilibrium to simulate the mechanical response of Opalinus clay during conventional triaxial tests (using cylindrical samples) and true triaxial tests (using cubic samples). The model satisfactorily reproduces the main physical processes that prevailed during those tests.

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Romanov, S. G., T. Maka, C. M. Sotomayor Torres, M. Müller, and R. Zentel. "Suppression of spontaneous emission in incomplete opaline photonic crystal." Journal of Applied Physics 91, no. 11 (June 2002): 9426–28. http://dx.doi.org/10.1063/1.1469688.

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Gates, Byron, Dong Qin, and Younan Xia. "Assembly of Nanoparticles into Opaline Structures over Large Areas." Advanced Materials 11, no. 6 (April 1999): 466–69. http://dx.doi.org/10.1002/(sici)1521-4095(199904)11:6<466::aid-adma466>3.0.co;2-e.

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Taubald, H., A. Bauer, T. Schäfer, H. Geckeis, M. Satir, and J. I. Kim. "Experimental investigation of the effect of high-pH solutions on the Opalinus Shale and the Hammerschmiede Smectite." Clay Minerals 35, no. 3 (June 2000): 515–24. http://dx.doi.org/10.1180/000985500546981.

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AbstractThe alteration and transformation behaviour of the Tertiary Hammerschmiede Smectite and the Jurassic Opalinus Shale in an alkaline solution was studied in column experiments. The Hammerschmiede Smectite is proposed as potential backfill material and the Opalinus Shale as host rock for the Swiss low-level nuclear waste storage site. Over a period of 18 months, the evolution of permeability, pH and solution concentrations were measured. After the experiment, the columns were cut into pieces to study the mineralogical and the chemical evolution of the clays. X-ray diffraction (XRD) revealed no significant appearance or disappearance of diffraction peaks at the end of the experiments. The scanning electron micrographs of the clays revealed that both clays exhibited a precipitation zone, which extends from 0 to 2 cm below the infiltration surface. Both clays showed significant differences in the evolution of pH and hydraulic conductivity. The solution front crossed the Opalinus Shale column entirely after only 11 weeks and the initial values for K+ and Na+ were conserved in the solution. For both clays, the salt concentrations in the percolating fluids mirror the evolution of pH.

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Jegerlehner, Vogel, Tappeiner, and Leib. "Was durch einen Visusverlust ans Licht kommt." Praxis 101, no. 6 (March 1, 2012): 419–23. http://dx.doi.org/10.1024/1661-8157/a000869.

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Eine 36-jährige Patientin, wurde aufgrund einer einseitigen Visusminderung vorstellig. Die ophthalmologische Untersuchung, im Kontext einer hochreaktiven Syphilis-Serologie, zeigte eine akute syphilitische plakoide Chorioretinitis. Mit einer Plaque opaline der Mundschleimhaut und mottenfrassähnlicher Alopezie lag klinisch eine sekundäre Syphilis mit Augenbeteiligung vor. Die Behandlung wurde mit 6x 4 Mio. IE Penicillin G während 14 Tagen und Prednison 50 mg während fünf Tagen durchgeführt. Anhand dieses Falles gehen wir auf die Diagnostik, Therapie und Nachkontrolle der Syphilis mit okulärer Beteiligung ein.

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Gomiero, LM, and FMS Braga. "Gonadossomatic relation and reproductive strategy of Brycon opalinus (Cuvier, 1819) in the Serra do Mar State Park - Núcleo Santa Virgínia, Atlantic Forest, Brazil." Brazilian Journal of Biology 67, no. 4 (November 2007): 727–33. http://dx.doi.org/10.1590/s1519-69842007000400020.

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The objective of this study was to analyze the gonadossomatic relation of males and females of Brycon opalinus (the Pirapitinga do Sul) in the Serra do Mar State Park-Núcleo Santa Virgínia. The study area included three rivers: Paraibuna, Ipiranga, and Grande. From the gonadossomatic relation, it was possible to determine the reproductive season and strategy of this species. The gonadossomatic relation was high throughout the year for both males and females. Sperm competition and dilution of the ejaculate in the spawning locations favored substantial development of the testicles. The sex ratio of Brycon opalinus was always in favor of females. The existence of sexual dimorphism in this species was confirmed from the larger size of the females.

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