261 research outputs found
Paleanotus chrysos Watson, 2015, n. sp.
No full text<i>Paleanotus chrysos</i> n. sp. <p>(Figs 1 I; 8A −L; 9)</p> <p> <b>Type material.</b> Holotype: NTM W.23203, Western Pacific Ocean, QLD, GBR, North Direction Island, 14º44.62’S, 145º30.72’E, CReefs, LI-08-019, coll. C. Glasby, Apr 2008, (23E, L: 2.5 mm, W: 0.45 mm). Paratypes: NTM W.25641, same locality as holotype, (6, including female with large eggs, 22 E, L: 2.5mm, W: 0.6 mm).</p> <p> <b>Other material examined.</b> NTM W.23688, Yonge Reef, 14º34.40’S, 145º37.11’E, CReefs, LI-10-116, Sep 2010, (3: 1, 21E, L: 1.2 mm, W: 0.6 mm); NTM W.23673, Waining Reef, 14º 27.84S, 145º 19.19E, CReefs, LI-09- 0 23, coral rubble, 2 m, coll. C. Watson, Feb 2009, (3E); NTM W.23669, Lizard Island, Coconut Beach, 14º40.88’S, 145º28.35’E, CReefs, LI-09-002, 2 m, coll. C. Watson, Feb 2009, (1, 19E, L: 1.2 mm, W: 0.6 mm); NTM W.23604, Mermaid Beach, 14º38.75’S, 145º27.21’E, CReefs, LI-08-006, fine green algae on sand, 12 m, Apr 2008, (1, 21 E); NTM W.25640, North Point, 14º38.73’S, 145º27.2’E, CReefs, LI-08-020, rubble, 2 m, coll. C. Watson & N. Bruce, Apr 2008, (1, 19E, L: 1.5 mm, W: 0.55 mm); MV F.214507, North east of Townsville, muddy sand, 26 m, (1NE); MV F.214506, Britomart Reef, 18º17’S, 146º38’E, algae & sponges, 3 m, Nov. 1982, (1, 22E, L: 2.3 mm, W: 0.7 mm); MV F 214509, same locality, encrusting algae, Nov 1982, (4, NE); MV F.125877, same locality, reef front, encrusted dead coral with fine red algae, Nov 1982, (1NE); NTM W.23190, Heron Island, CReefs, HI-09-046, Sykes Reef, rubble, 10 m, Nov 2009, (1, 17NE); NTM W.23656, CReefs, HI-10-009, Sykes Reef, rubble, 14 m, coll. M. Blazewicz-Paszokowycz, Nov 2010, (2: 1, 22NE, L: 2.2 mm, W: 0.55 mm; 1, 24E, L: 2.0 mm, W: 0.75 mm); NTM W.23658, North East Lamont Reef, 23º35.20’S, 152º3.73’E, CReefs, HI-10-013, 21 m, coll. M. Capa, Nov 2010, (1, 22E, L: 2 mm, W: 0.65 mm); SMNH 97309, Western Pacific, France, New Caledonia, Loyalty Islands, Lifou, 17 m, (1, 20E, L: 2 mm, W: 0.65 mm).</p> <p> <i>Paleanotus chrysos</i> species complex</p> <p>NTM W.13169, Philippines, Luzon, Cape Bolinao, coral rubble, red algae & sponge, 12 m, coll. B. Russell, Oct 1995, (1NE, W: 0.9 mm).</p> <p> <b>Description.</b> (based on holotype and other material where noted). Very small, elongate body with distinctive paleal notochaetae coloured deep yellow to bright gold. Paleae in neat, slightly ‘prickly’, raised fans over dorsum ie. not completely flattened as in other <i>Paleanotus</i> species. Neuropodia extend a little beyond notopodia.</p> <p>Prostomium with 2 pairs large, dark maroon eyes often merged; median antenna slender, subulate; large, glandular nuchal fold covers posterior prostomium. Segment 2 (chaetigerous segment 1) with 2–4 slender, pointed paleae with 3 ribs (Fig. 8 A, B).</p> <p>Notochaetae of mid-body notopodium composed of 2 slender, pointed laterals with 4–5 ribs; subunit 1 paleae usually absent, sometimes 1–2 small spines present (Fig. 8 C). Main paleae number 6–8 with 13–15 (16) ribs. Paleae with rounded to slight sloping brow, robust margin serration; broad, curved apices. At moderate magnification superior surface of main paleae appears smooth; at high magnification ribs appear thickened, especially basally, with about 4–6 b.l. ribs. Slender dorsal cirri about 2/3 length of main paleae fan (Figs 1 I; 8K; 9). Median paleae number 3; distinctive narrow shape with sloping brow. Lizard Island material median paleae slender with distinct ‘upswept’, broad apices, 8–11 (12) ribs (Fig. 8 E, D). Heron Island, New Caledonian median paleae broader with 9–12 ribs (Fig. 8 K, L). Median paleae appear smooth; under high magnification 5 b.l. ribs visible, especially basally.</p> <p>Neurochaetal types of mid-body neuropodium composed of 2 superior, very slender falcigers; about 4 midsuperior falcigers; 6–8 mid-group falcigers. Latter three groups with pronounced basal serrations. Inferior group of shorter falcigers with slender blades, number 4–6. Total number about 20 (Fig. 8 F–J). Ventral cirri short, subulate.</p> <p> <b>Remarks.</b> <i>Paleanotus chrysos</i> n. sp. has the smallest maximum body segment number and length compared to all other species described in this paper; e.g., mature GBR specimen 24E, length 2.6 mm, width 0.75 mm; the New Caledonian specimen, 20E and length 3.7 mm. <i>Paleanotus chrysos</i> n. sp. is coloured deep yellow in northern GBR specimens, deep mustard yellow to gold in reefs off Townsville, and bright brassy gold in material from Heron Island, southern GBR: a depth of notochaetal pigmentation not seen in any of the other small <i>Paleanotus</i> species.</p> <p> <i>Paleanotus chrysos</i> n. sp. is further differientated by possession of pointed lateral paleae with small number of ribs and short spine/s and the absence of sub-unit 1 paleae. The median paleae shape is unique and horizontal striae are observed more widely separated in the basal quarter of paleae becoming finer distally (Fig. 8 E). Neurochaetal types are similar to those of other species but possess a greater degree of basal serration, particularly of the midgroup falcigers (Fig. 8 G–I). An ovigerous female paratype specimen (starting to disintegrate), has large eggs present from chaetiger 6, measuring 200–250 µm in diameter (Fig. 9).</p> <p> Body size and chaetal morphology of individuals from northern and southern GBR specimens, reefs off Townsville and New Caledonia overall agrees. Lizard Island material possesses the narrowest median paleae as do <i>P. chrysos</i> n. sp. from reefs off Townsville. Heron Island specimens exhibits some broader median paleae as well as the narrower ones; the New Caledonian individual has mainly broad median paleae (cf Fig. 8 D, E & K, L).</p> <p> A New Caledonian specimen is cited as ‘ <i>Paleanotus</i> LI’ in Wiklund <i>et al.</i> (2009). The SMNH specimen on loan for this study is entire so another <i>Paleanotus</i> from the same collection must have been used for the DNA analysis. As there was no morphological description in the paper, a designated species name for the DNA individual is unknown. Future <i>Paleanotus</i> genetic analyses with named species may be able to reveal its identity.</p> <p> A Philippine individual belonging to <i>Paleanotus chrysos</i> species complex was collected from an encrusted habitat similar to habitats of <i>P. chrysos</i> n. sp. from the GBR. Chaetal types are also very similar e.g., slender lateral paleae and spines, and the egg size is the same. However the main and median paleae have even more elevated apices; paleael sculpture is different with no b.l. ribs on main paleae and the median paleae possess a central raised rib. This specimen appears part of the <i>chrysos</i> complex and may prove to be a new species. Slender, pointed laterals, often accompanied by spines in <i>Paleanotus chrysos</i> n. sp. are also seen in the <i>P. silus</i> n. sp. species complex but the main and median paleae shape are different between the species. <i>P. chrysos</i> has been found sympatric with <i>Paleanotus adornatus</i> n. sp. in coral rubble collections from Lizard Island, GBR.</p> <p> <b>Etymology.</b> The species name, <i>chrysos,</i> is derived from the Greek meaning ‘gold’ and refers to the distinctive colour of the notochaetal paleae.</p> <p> <b>Habitat / Distribution.</b> Recorded from the Coral Sea: Lizard Island, reefs off Townsville and Heron Island, GBR, NE coast of Australia and New Caledonia. <i>Paleanotus chrysos</i> n. sp. appears to favour a complex habitat of encrusted coral rubble, red algae, sponges as well as fine algae on sand; depth 2− 30 m.</p>Published as part of <i>Watson, Charlotte, 2015, Seven new species of Paleanotus (Annelida: Chrysopetalidae) described from Lizard Island, Great Barrier Reef, and coral reefs of northern Australia and the Indo-Pacific: two cryptic species pairs revealed between western Pacific Ocean and the eastern Indian Ocean, pp. 707-732 in Zootaxa 4019 (1)</i> on pages 726-729, DOI: 10.11646/zootaxa.4019.1.24, <a href="http://zenodo.org/record/234245">http://zenodo.org/record/234245</a>
L'Empire romain et ses communautés : l'exemple grec
No full textColloque européen d'Athènes, 13‑14 mars 2003, in E. Chrysos, P. M. Kitromilides, C. Svolopoulos (eds
Collision-induced Raman scattering and the peculiar case of neon: Anisotropic spectrum, anisotropy, and the inverse scattering problem
No full textOwing in part to the p orbitals of its filled L shell, neon has repeatedly come on stage for its peculiar properties. In the context of collision-induced Raman spectroscopy, in particular, we have shown, in a brief report published a few years ago [M. Chrysos et al., Phys. Rev. A 80, 054701 (2009)], that the room-temperature anisotropic Raman lineshape of Ne–Ne exhibits, in the far wing of the spectrum, a peculiar structure with an aspect other than a smooth wing (on a logarithmic plot) which contrasts with any of the existing studies, and whose explanation lies in the distinct way in which overlap and exchange interactions interfere with the classical electrostatic ones in making the polarizability anisotropy, α ∥ − α ⊥. Here, we delve deeper into that study by reporting data for that spectrum up to 450 cm−1 and for even- and odd-order spectral moments up to M 6, as well as quantum lineshapes, generated from SCF, CCSD, and CCSD(T) models for α ∥ − α ⊥, which are critically compared with the experiment. On account of the knowledge of the spectrum over the augmented frequency domain, we show how the inverse scattering problem can be tackled both effectively and economically, and we report an analytic function for the anisotropy whose quantum lineshape faithfully reproduces our observations
More light on the 2ν5 Raman overtone of SF6: Can a weak anisotropic spectrum be due to a strong transition anisotropy?
No full textLong known as a fully polarized band with a near vanishing depolarization ratio [η s = 0.05, W. Holzer and R. Ouillon, Chem. Phys. Lett.24, 589 (1974)], the 2ν5 Raman overtone of SF6 has so far been considered as of having a prohibitively weak anisotropic spectrum [D. P. Shelton and L. Ulivi, J. Chem. Phys.89, 149 (1988)]. Here, we report the first anisotropic spectrum of this overtone, at room temperature and for 13 gas densities ranging between 2 and 27 amagat. This spectrum is 10 times broader and 50 times weaker than the isotropic counterpart of the overtone [D. Kremer, F. Rachet, and M. Chrysos, J. Chem. Phys.138, 174308 (2013)] and its profile much more sensitive to pressure effects than the profile of the isotropic spectrum. From our measurements an accurate value for the anisotropy matrix-element |⟨000020|Δα|000000⟩| was derived and this value was found to be comparable to that of the mean-polarizability ((000020),α¯¯,(000000)) . Among other conclusions our study offers compelling evidence that, in Raman spectroscopy, highly polarized bands or tiny depolarization ratios are not necessarily incompatible with large polarizability anisotropy transition matrix-elements. Our findings and the way to analyze them suggest that new strategies should be developed on the basis of the complementarity inherent in independent incoherent Raman experiments that run with two different incident-beam polarizations, and on concerted efforts to ab initiocalculate accurate data for first and second polarizability derivatives. Values for these derivatives are still rarities in the literature of SF6
The idea of European Community in history: conference proceedings
No full text2 v. (289 ; 236 p.) ; 24 cmThe aim of the conference was to explore the historicity of the idea of European community. It specifically focused on seeking and analysing points of convergence between peoples and states of Europe from early historical times to present day.The Proceedings are published in two volumes. The papers included are written in English, French, German and Spanish. Volume I comprises papers referring to the Byzantine era, the Middle Ages, Recent and Modern times. Subjects examined in this volume are, among others: the idea of Europe in the Middle Ages, the relations between Byzantium and West Europe during the Middle Ages, the formation of the idea of European identity in Recent times, the attempts of unifying Europe in the Inter-war period and the process of European unification in the last fifty years. Volume II focuses on political forms of a communal character in the ancient world, like symmachies, koina, ethne and poleis. The formation and the internal structure of such political forms, the relations between them and their place in the Hellenistic and Roman world are some of the subjects examined in this volume. Volume II also includes two indices, one of Greek terms and one of sources.Vol. 1 / Edited by Evangelos Chrysos, Paschalis M. Kitromilides, Constantine Svolopoulos -- Vol. 2: Aspects of connecting poleis and ethne in ancient Greece / edited by Kosta Buraselis and Kleanthis Zoumboulaki
Dirac bubble potential for He–He and inadequacies in the continuum: Comparing an analytic model with elastic collision experiments
No full textInternational audienceWe focus on the long-pending issue of the inadequacy of the Dirac bubble potential model in the description of He–He interactions in the continuum [L. L. Lohr and S. M. Blinder, Int. J. Quantum Chem. 53, 413 (1995)]. We attribute this failure to the lack of a potential wall to mimic the onset of the repulsive interaction at close range separations. This observation offers the explanation to why this excessively simple model proves incapable of quantitatively reproducing previous experimental findings of glory scattering in He–He, although being notorious for its capability of reproducing several distinctive features of the atomic and isotopic helium dimers and trimers [L. L. Lohr and S. M. Blinder, Int. J. Quantum Chem. 90, 419 (2002)]. Here, we show that an infinitely high, energy-dependent potential wall of properly calculated thickness rc(E) taken as a supplement to the Dirac bubble potential suffices for agreement with variable-energy elastic collision cross section experiments for 4He–4He, 3He–4He, and 3He–3He [R. Feltgen et al., J. Chem. Phys. 76, 2360 (1982)]. In the very low energy regime, consistency is found between the Dirac bubble potential (to which our extended model is shown to reduce) and cold collision experiments [J. C. Mester et al., Phys. Rev. Lett. 71, 1343 (1993)]; this consistency, which in this regime lends credence to the Dirac bubble potential, was never noticed by its authors. The revised model being still analytic is of high didactical value while expected to increase in predictive power relative to other appraisals.</p
The depolarized Raman 2 nu(3) overtone of CO2: A line-mixing shape analysis
No full textIn a recent article we showed that the 2 nu(3) transition of CO2 gives rise to a Raman spectrum that is almost entirely depolarized [M. Chrysos, I. A. Verzhbitskiy, F. Rachet, and A. P. Kouzov, J. Chem. Phys. 134, 044318 (2011)]. In the present article, we go further forward in the study of this overtone by reporting a first-principles shape analysis of its depolarized spectrum at room temperature. As a first step in our analysis, a model assuming isolated Lorentzian line shapes was applied, which at low gas densities turns out to be sufficient for qualitative conclusions. As the next step, a sophisticated approach was developed on the basis of the extended strong-collision model in order to properly account for the heavy line mixing between rotational lines. Whereas a marked deviation between model and measured spectra was observed upon application of the simpler model, striking agreement even at the highest CO2 density was found on applying the sophisticated one. Accurate calculated data were used for the rotational line broadening coefficients without resort to arbitrary parameters. Values for the vibrational shift scaling linearly with the density of the gas are given
The isotropic remnant of the CO2 near-fully depolarized Raman 2v3 overtone
No full textIn a recent paper [M. Chrysos, I. A. Verzhbitskiy, F. Rachet, and A. P. Kouzov, J. Chem. Phys. 134, 044318 (2011)], we showed that, in CO2, the 2 nu(3) transition generates a Raman line spectrum that is 98% depolarized, a property in agreement with general symmetry rules. Here, we present an extensive analysis, experimental and theoretical, of the isotropic remnant of this overtone. The isotropic spectrum turned out to be 45 times less intense than its anisotropic counterpart and to have a moment that is 350 times smaller than the moment of the anisotropic spectrum, in excellent agreement with theoretical predictions. Once the measured intensity (along with other data exclusively experimental) was fed back into the formula of the moment, a value for the CO2 mean-polarizability asymmetric stretch derivative partial derivative(2)(alpha) over bar/partial derivative q(3)(2) was returned that matches the best ab initio prediction to better than 4%. Agreement, in order of magnitude, was found between the intensity reported herein and that reported in the sole prior study of this overtone [G. Tejeda, B. Mate, and S. Montero, J. Chem. Phys. 103, 568 (1995)]. (C) 2011 American Institute of Physics. [doi:10.1063/1.3557820
Cast of Pygmalion and Galatea 1922, University of Queensland
No full textCast of Pygmalion and Galatea 1922, University of Queensland. Cast (not named on photo): Statue Galatea - Miss D. Bleakley ; Galatea - Miss M. MacGregor ; Cynisca - Miss M. Robertson ; Daphne - Miss N. Hutchinson ; Myrine - Miss I. Bartholomew ; Pygmalion - Mr T.H.C. Townsend ; Chrysos - Mr N. Bennett ; Leucippus - Mr. D. Henderson ; Mimos - Mr F. Bennett ; Agesimos - Mr A. Clappison (Information from Galmahra Aug 1922 p. 48
Modulation of vascular endothelium by imatinib: a study on the EA.hy 926 endothelial cell line
No full text- …
