61 research outputs found
The Depositional Environment of the Queenston Formation in Southern Ontario
No full textTitle: The Depositional Environment of the Queenston Formation in Southern Ontario, Author: Paul J. Brogly, Location: ThodeThe Queenston Formation has been interpreted as a
non-marine deltaic deposit since the turn of the century
because of its apparent lack of fossils, and evidence for
subaerial exposure. The source of the sediment was interpreted
to be an orogenic zone in New York or Pennsylvannia. Features such as gypsum nodules and limy siltstones
were interpreted as being secondary. However, petrographic
studies have found that the siltstones contain marine fossils
and some gypsum nodules have inclusions of halite. Moreover,
the fine sand grains in the mudrock are not aeolian. Paleocurrents
indicate that the source of the sediment transport
was generally north-south not east-west. The siltstone and
limestone interbeds are flat based, graded, and show no
evidence for channeling. Some beds also contain large escape
burrows. It is proposed that the Queenston Formation was
deposited as a supratidal; mudflat that was regularly flooded
by the sea. The mud could have been transported by longshore
drift from a river somewhere towards the north, as the
paleocurrents in the Queenston mimic major tradewind patterns
for the Late Ordovician.ThesisBachelor of Science (BSc
Supplemental Material, Appendix_1_revised_June_7 - Management of Cancer-Associated Intestinal Obstruction in the Final Year of Life
No full textSupplemental Material, Appendix_1_revised_June_7 for Management of Cancer-Associated Intestinal Obstruction in the Final Year of Life by Shaila J. Merchant, Susan B. Brogly, Christopher M. Booth, Craig Goldie, Yingwei Peng, Sulaiman Nanji, Sunil V. Patel, Katherine Lajkosz and Nancy N. Baxter in Journal of Palliative Care</p
European minimum standards for obstetric analgesia and anaesthesia departments: An experts' consensus
No full text: An important variability of anaesthetic standards of care was discovered in the obstetric departments of many European Union countries. After discussing this issue in various meetings of the European Society of Anaesthesiology (ESA) board and its obstetric subcommittee, European Board of Anaesthesiology of the European Union of Medical Specialists (EBA-UEMS) executive members, ESA obstetric subcommittee members and European experts in obstetric anaesthesiology have participated in the elaboration of this document. This experts' opinion is focused mainly on obstetric patients and safety concerns in terms of minimum standards of practice. An initial bibliographical search was performed in medical databases and general literature, searching for obstetric anaesthesiology standards to select the most important safety issues. After the initial presentation of the project during EBA-UEMS and ESA obstetric subcommittee meetings, participants were asked to review the document; several rounds of revisions were performed by the experts, to reach a common opinion concerning the topics considered central to patient safety in the obstetric setting. After three rounds of revision, a consensus was reached and is presented in this document, which includes the list of topics considered relevant by the involved areas, and the respective recommendations. These recommendations covered some EBA-UEMS strategic key areas, in addition to several clinical aspects of common obstetric practice
Exploring associations between perceived HCV status and injecting risk behaviors among recent initiates to injecting drug use in Glasgow
No full textThe aim of this study was to explore the influence of testing for hepatitis C virus (HCV) and perceived HCV status on injecting risk behavior. A cross-sectional, community-wide survey was undertaken at multiple sites throughout Greater Glasgow during 2001-2002. Four hundred ninety-seven injecting drug users (IDUs) consented to participate and were interviewed using a structured questionnaire to ascertain HCV test history and injecting risk behavior. The average age of participants was 27 years and the majority of the sample were male (70.4%). Participants had been injecting for an average duration of 2.5 years. Logistic regression analysis revealed no significant associations between having been tested and injecting risk behavior. After adjustment for potential confounding variables, HCV-negatives were significantly less likely to borrow needles/syringes and spoons or filters as compared with unawares and were significantly less likely to borrow spoons or filters as compared with HCV-positives. Due to the cross-sectional design of the study, it is uncertain whether this reduction in risk behavior could be attributed to perception of HCV status. Further research is recommended to consolidate the evidence for this relationship
Chain flattening of spin-cast PMMMA on aluminum mirrors: Influence of polymer tacticity
No full textInternational audiencePolymer tacticity has already been shown to be an influential parameter governing the behavior of polymer solutions and polymer blends, but not for polymer adsorption. However, using PMMA having a racemic fraction (f(r)) ranging from 0.1 to 0.9, spin-cast on aluminum mirror surfaces, makes it possible to work out configuration differences in the adsorbed layer. Reflectance infra-red spectroscopy has been used to evaluate the fraction of surface bonded carbonyl groups (f(C=0)(ab)) and local conformations of both main and side chain. The f(C=0)(ab) value is 0.1 for highly syndiotactic PMMA and reaches 0.7 for mainly isotactic PMMA. This latter very high value of f(C=0)(ab) can only be explained by chain flattening resulting from a distortion from its isotropic state. This distortion may be due to both strong interactions that may exist between PMMA and the aluminium substrate, and also to the spin-cast process that may lead to chain straightening and flattening. The assumption of conformational energy changes of both backbone and side chain is confirmed by changes in the FT-IR A upsilon(2)(1245 cm(-1))/A upsilon(1)(1265-1275 cm(-1)) ratio. Ellipsometric spectroscopy has provided information on the global conformation of adsorbed chains by precise thickness measurements. Thus, thickness (h) increases for diluted solutions linearly from 10 to 70 Angstrom as the average syndiotactic sequence length (n(s)) increases. However, IR and ellipsometric results tend to prove that isotactic PMMA may adsorb on the aluminum surface in a more flattened way with longer chains than atactic and syndiotactic chains. This can be explained by the ability of chain segmental rearrangements (meso tg state) that may allow isotactic PMMA to favor the establishment of interfacial acid-base bonds while the syndiotactic PMMA local stiffness of the tt state does not. The influence of the chain entropy in solution is also discussed as an important parameter. (C) 1997 Elsevier Science Ltd. All rights reserved
Association of continuous perfusion and patient controlled epidural analgesia for the management of labour pain: A randomized double-blinded study vs single patient controlled epidural analgesia
No full textRecommended from our members
Human immunodeficiency virus diagnostic testing of infants at clinical sites in North America: 2002-2006
No full textOur objectives were to assess the timing of testing, the types of diagnostic assays used, and the costs associated with the diagnosis of HIV-1 infection among infants born to HIV-1-infected women enrolled in the International Maternal Pediatric Adolescent AIDS Clinical Trials Group Protocol 1025 (P1025).
P1025 is a prospective cohort study of HIV-1-infected women and their infants at clinical sites in the United States and Puerto Rico. Enrollment began in 2002 and is ongoing. Follow-up of infants continued for at least 6 months after delivery/birth. The study population for this analysis comprised all live born infants of known HIV-1 infection status, born by December 31, 2006 to enrolled women.
Nine hundred eighty-eight infants had 5147 HIV-1 diagnostic test results reported. The median number of HIV-1 diagnostic assays performed per infant was 5 (10th, 90th percentiles: 3, 7), and the greatest number of tests reported per infant was 13. The median ages at the time of the first, second, third, and fourth HIV-1 diagnostic assay were 0.1, 2.3, 7.0, and 17.6 weeks, respectively. Nucleic acid amplification tests (NAATs) represented 86.9% of all diagnostic assays (HIV-1 DNA PCR assays: n = 4082 [79.3%]; other NAATs: n = 389 [7.6%]). The median cost per infant for HIV-1 diagnostic testing was 762, $1642).
Most assays reported for HIV-1-exposed infants at clinical sites in the United States and Puerto Rico were NAATs, but the number of HIV-1 diagnostic assays performed per infant, and the cost associated with HIV-1 diagnostic testing per infant, varied greatly
Método de suma acumulada (CUSUM) para evaluar las curvas de aprendizaje del bloqueo femoral continuo guiado por ecografía
No full textUse of the cumulative sum method (CUSUM) to assess the learning curves of ultrasound-guided continuous femoral nerve block
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