Depositional Environments and Sequence Stratigraphy of a Breathitt Group Exposure, U.S. 25E, Flat Lick, Kentucky

The Pennsylvanian fluvial deltaic Breathitt Group is exposed along U.S. 25E near Flat Lick, Ky. This exposure is ideal for field trips because of the quality of the exposure, its accessibility, the range of facies present, and its potential for demonstrating principles of outcrop-based sequence-stratigraphic interpretation. Eight facies are present and represent deposition in fluvial, delta-plain, and delta-front environments. Several facies contain an abundance of trace fossils, and a wide range of sedimentary structures are also present. Flooding surfaces are well developed in the delta front and delta plain and are characterized by abrupt contacts with distal, deeper-water deltaic environments overlying proximal, shallower-water deltaic environments. Major flooding surfaces display evidence of condensation, including firmgrounds and enrichment of authigenic minerals such as siderite. At this exposure, most parasequence sets display progradational stacking and are interpreted as highstand systems tracts. Two sequence boundaries are present that may represent two different scales of sequences. The upper sequence boundary is more obvious and is characterized by a prominent erosional surface and is overlain by multistory fluvial channels. The lower and more subtle sequence boundary is interpreted as an interfluve surface marked by a bleached paleosol

Transplante hepático infantil: As contra indicações sociais trabalhadas pelo serviço social no processo de avaliação junto às famílias de crianças candidatas ao transplante

OBJECTIVE: To identify the nature of the main social side-effects of 89 families ofchildren who require liver transplant, and who were evaluated by the social servicewith the program for hepatic transplant in children at Hospital de Clínicas de PortoAlegre. MATERIALS AND METHODS: A quantitative research project was designed usingexisting data from the registration form of social service, which contains informationregarding children who are candidates to transplant. RESULTS: From a total of 89 families that were evaluated, there was an indication ofimmediate social side-effects in 55 families, or 61.8% of the total; there was also anindication of deficit in the category family relationships in 69.1% of these 55 families;and 25.4% of these 55 families indicated a deficit in the category family cultural aspects.Only one family did not indicate deficit in the category social and economic organization. CONCLUSION: The results indicate the importance of the work of social servicepersonnel for the program of hepatic transplant in children at Hospital de Clínicas dePorto Alegre. Of the 55 families that were evaluated the social service, and thatpresented immediate social side-effects, 34 families, or 61%, were socially preparedto have their child submitted to transplant as a result of the work performed by socialservice.OBJETIVO: Identificar a natureza das principais contra-indicações sociaisapresentadas por 89 famílias de crianças candidatas a transplante de fígado queforam avaliadas pelo Serviço Social no Programa de Transplante Hepático Infantil doHCPA. MATERIAIS E MÉTODOS: Trata-se de uma pesquisa documentada de cunhoquantitativo elaborada a partir de dados existentes no protocolo de atendimento doServiço Social, onde são cadastrados crianças candidatas ao procedimento. RESULTADOS: Do total de 89 famílias avaliadas, 55 delas, equivalente à 61,8%apresentam alguma contra-indicação social imediata. Deste total de 55 famílias, 69,1%apresentaram déficit na categoria relações familiares; 25,4% destas 55 famíliasapresentaram déficit aspecto cultural-familiar. Na categoria organização sócioeconômica apenas uma família não apresentou déficit. CONCLUSÃO: Os resultados indicam a importância do trabalho do assistente socialjunto à equipe do programa de Transplante Hepático Infantil, pois das 55 famíliasavaliadas socialmente e que apresentaram contra-indicação social imediata, 34 delas,equivalente a 61% , estão aptas socialmente para a realização do transplante, a partirdo trabalho desenvolvido pelo serviço socia

Radial Velocity Studies of Close Binary Stars.IV

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for the fourth set of ten close binary systems: 44 Boo, FI Boo, V2150 Cyg, V899 Her, EX Leo, VZ Lib, SW Lyn, V2377 Oph, Anon Psc (GSC 8-324), HT Vir. All systems are double-lined spectroscopic binaries with only two of them not being contact systems (SW Lyn and GSC 8-324) and with five (FI Boo, V2150 Cyg, V899 Her, EX Leo, V2377 Oph) being the recent photometric discoveries of the Hipparcos satellite project. Five of the binaries are triple-lined systems (44 Boo, V899 Her, VZ Lib, SW Lyn, HT Vir). Three (or possibly four) companions in the triple-lined systems show radial-velocity changes during the span of our observations suggesting that these are in fact quadruple systems. Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.Comment: aastex5.0, 5 figures in PS; submitted to Astron.

Epileptic monocular nystagmus and ictal diplopia as cortical and subcortical dysfunction

AbstractWe present the case of a patient with ictal monocular nystagmus and ictal diplopia who became seizure-free after resection of a right frontal focal cortical dysplasia (FCD), type 2B. Interictal neuroophthalmological examination showed several beats of a monocular nystagmus and a spasm of the contralateral eye. An exclusively ictal monocular epileptic nystagmus could be an argument for an exclusively cortical involvement in monocular eye movement control. The interictal findings in our patient, however, argue for an irregular ictal activation of both the cortical frontal eye field and the brainstem

Radial Velocity Studies of Close Binary Stars.III

Radial velocity measurements and simple sine-curve fits to the orbital velocity variations are presented for the third set of ten contact binary systems: CN And, HV Aqr, AO Cam, YY CrB, FU Dra, RZ Dra, UX Eri, RT LMi, V753 Mon, OU Ser. All systems but two are contact, double-line spectroscopic binaries with four of them (YY CrB, FU Dra, V753 Mon, OU Ser) being the recent discoveries of the Hipparcos satellite project. The most interesting object is V753 Mon with the mass-ratio closest to unity among all contact systems (q = 0.970 pm 0.003) and large total mass ((M1+M2)sin^3i = 2.93 pm 0.06). Several of the studied systems are prime candidates for combined light and radial-velocity synthesis solutions.Comment: submitted for publication in Astronomical Journal; 3 figures, 2 table

Total Synthesis of an Exceptional Brominated 4-Pyrone Derivative of Algal Origin: An Exercise in Gold Catalysis and Alkyne Metathesis

A concise approach to the algal metabolite 1 is described, which also determines the previously unknown stereostructure of this natural product. Compound 1 is distinguished by a rare brominated 4-pyrone nucleus linked as a ketene–acetal to a polyunsaturated macrocyclic scaffold comprising an extra homoallylic bromide entity. The synthesis of 1 is based on the elaboration and selective functionalization of the linear precursor 23 endowed with no less than six different sites of unsaturation including the highly enolized oxo-alkanoate function. Key to success was the formation of the 2-alkoxy-4-pyrone ring by a novel gold-catalyzed transformation which engages only the acetylenic β-ketoester substructure of 23 but leaves all other π-bonds untouched. The synthesis was completed by a ring-closing alkyne metathesis to forge the signature cycloalkyne motif of 1 followed by selective bromination of the ketene–acetal site in the resulting product 27 without touching the skipped diene–yne substructure resident within the macrocyclic tether

The X-ray Telescope of CAST

The Cern Axion Solar Telescope (CAST) is in operation and taking data since 2003. The main objective of the CAST experiment is to search for a hypothetical pseudoscalar boson, the axion, which might be produced in the core of the sun. The basic physics process CAST is based on is the time inverted Primakoff effect, by which an axion can be converted into a detectable photon in an external electromagnetic field. The resulting X-ray photons are expected to be thermally distributed between 1 and 7 keV. The most sensitive detector system of CAST is a pn-CCD detector combined with a Wolter I type X-ray mirror system. With the X-ray telescope of CAST a background reduction of more than 2 orders off magnitude is achieved, such that for the first time the axion photon coupling constant g_agg can be probed beyond the best astrophysical constraints g_agg < 1 x 10^-10 GeV^-1.Comment: 19 pages, 25 figures and images, replaced by the revised version accepted for publication in New Journal of Physic

Orbital and physical parameters of eclipsing binaries from the ASAS catalogue -- I. A sample of systems with components' masses between 1 and 2 M⊙_\odot

We derive the absolute physical and orbital parameters for a sample of 18 detached eclipsing binaries from the \emph{All Sky Automated Survey} (ASAS) database based on the available photometry and our own radial velocity measurements. The radial velocities (RVs) are computed using spectra we collected with the 3.9-m Anglo-Australian Telescope and its \emph{University College London Echelle Spectrograph} and the 1.9-m SAAO Radcliffe telescope and its \emph{Grating Instrument for Radiation Analysis with a Fibre Fed Echelle}. In order to obtain as precise RVs as possible, most of the systems were observed with an iodine cell available at the AAT/UCLES and/or analyzed using the two-dimensional cross-correlation technique (TODCOR). The RVs were measured with TODCOR using synthetic template spectra as references. However, for two objects we used our own approach to the tomographic disentangling of the binary spectra to provide observed template spectra for the RV measurements and to improve the RV precision even more. For one of these binaries, AI Phe, we were able to the obtain an orbital solution with an RV $rms$ of 62 and 24 m s$^{-1}$ for the primary and secondary respectively. For this system, the precision in $M \sin^3{i}$ is 0.08%. For the analysis, we used the photometry available in the ASAS database. We combined the RV and light curves using PHOEBE and JKTEBOP codes to obtain the absolute physical parameters of the systems. Having precise RVs we were able to reach $\sim$0.2 % precision (or better) in masses in several cases but in radii, due to the limited precision of the ASAS photometry, we were able to reach a precision of only 1% in one case and 3-5 % in a few more cases. For the majority of our objects, the orbital and physical analysis is presented for the first time.Comment: 16 pages, 2 figures, 6 tables in the main text, 1 table in appendix, to appear in MNRA