401
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Buettner A, Popham P, Morgan D. Incidence of epidural blood patch following obstetric regional analgesia in private Australian anaesthetic practice. Int J Obstet Anesth 2005; 14:5-8. [PMID: 15627531 DOI: 10.1016/j.ijoa.2004.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/01/2004] [Indexed: 11/19/2022]
Abstract
BACKGROUND Collection of audit data about epidural blood patches has traditionally relied on voluntary reporting, which is notoriously incomplete. The records of Medicare-funded Australian private obstetric practice, which represents 30% of all deliveries, allow a novel method of central data collection and retrieval. METHOD Data relating to all deliveries, epidurals and blood patches in private practice in Australia over a two-year period were retrieved from the Health Insurance Commission. RESULTS The overall rate of epidural analgesia in labour was estimated at 30% and the proportion of epidurals that progressed to blood patching was 0.35%. The rate of epidural blood patching varied between states from 0.18% to 0.56%. CONCLUSION Despite certain limitations of our data interpretation, we regard this technique as a useful audit tool capable of generating accurate and robust audit data that might otherwise be unobtainable.
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402
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Wilkinson DA, Popham P, Morgan D. Pacemaker interference from cardiac monitors revisited. Anaesth Intensive Care 2004; 32:842-3. [PMID: 15649001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
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403
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Folland R, Hines E, Dutta R, Boilot P, Morgan D. Comparison of neural network predictors in the classification of tracheal-bronchial breath sounds by respiratory auscultation. Artif Intell Med 2004; 31:211-20. [PMID: 15302087 DOI: 10.1016/j.artmed.2004.01.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2003] [Revised: 11/06/2003] [Accepted: 01/17/2004] [Indexed: 11/28/2022]
Abstract
Despite extensive research in the area of identification and discrimination of tracheal-bronchial breath sounds by computer analysis, the process of identifying auscultated sounds is still subject to high estimation uncertainties. Here we assess the performance of the relatively new constructive probabilistic neural network (CPNN) against the more common classifiers, namely the multilayer perceptron (MLP) and radial basis function network (RBFN), in classifying a broad range of tracheal-bronchial breath sounds. We present our data as signal estimation models of the tracheal-bronchial frequency spectra. We have examined the trained structure of the CPNN with respect to the other architectures and conclude that this architecture offers an attractive means with which to analyse this type of data. This is based partly on the classification accuracies attained by the CPNN, MLP and RBFN which were 97.8, 77.8 and 96.2%, respectively. We concluded that CPNN and RBFN networks are capable of working successfully with this data, with these architectures being acceptable in terms of topological size and computational overhead requirements. We further believe that the CPNN is an attractive classification mechanism for auscultated data analysis due to its optimal data model generation properties and computationally lightweight architecture.
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404
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Han B, Van der Ven A, Morgan D, Ceder G. Electrochemical modeling of intercalation processes with phase field models. Electrochim Acta 2004. [DOI: 10.1016/j.electacta.2004.05.024] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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405
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406
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Abdalla FC, Jones GR, Morgan D, Cruz-Landim CD. Chemical composition of the dufour gland secretion in queens of Melipona bicolor (Hymenoptera, Meliponini). J BRAZIL CHEM SOC 2004. [DOI: 10.1590/s0103-50532004000500002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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407
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Jarvis S, Elliott D, Morgan D, Winston R, Readhead C. Molecular markers for the assessment of postnatal male germ cell development in the mouse. Fertil Steril 2004. [DOI: 10.1016/j.fertnstert.2004.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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408
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Jagasia MH, Greer J, Kassim A, Mineishi S, Morgan D, Ruffner K, Schuening F. Pegylated filgrastim (PF) after high dose chemotherapy (HDC) and autologous stem cell transplant (ASCT). J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.6639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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409
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Peterson JR, Bickford LC, Morgan D, Kim AS, Ouerfelli O, Kirschner MW, Rosen MK. Chemical inhibition of N-WASP by stabilization of a native autoinhibited conformation. Nat Struct Mol Biol 2004; 11:747-55. [PMID: 15235593 DOI: 10.1038/nsmb796] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2004] [Accepted: 05/24/2004] [Indexed: 01/22/2023]
Abstract
Current drug discovery efforts focus primarily on proteins with defined enzymatic or small molecule binding sites. Autoregulatory domains represent attractive alternative targets for small molecule inhibitors because they also occur in noncatalytic proteins and because allosteric inhibitors may avoid specificity problems inherent in active site-directed inhibitors. We report here the identification of wiskostatin, a chemical inhibitor of the neural Wiskott-Aldrich syndrome protein (N-WASP). Wiskostatin interacts with a cleft in the regulatory GTPase-binding domain (GBD) of WASP in the solution structure of the complex. Wiskostatin induces folding of the isolated, unstructured GBD into its autoinhibited conformation, suggesting that wiskostatin functions by stabilizing N-WASP in its autoinhibited state. The use of small molecules to bias conformational equilibria represents a potentially general strategy for chemical inhibition of autoinhibited proteins, even in cases where such sites have not been naturally evolved in a target.
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410
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Townsend KP, Shytle D, Sun N, Zeng J, Bai Y, Vendrame M, Fernandez F, Morgan D, Sanberg P, Tan J. P1-418 Lovastatin modulation of microglial activation via suppression of CD40 and its signaling pathway. Neurobiol Aging 2004. [DOI: 10.1016/s0197-4580(04)80730-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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411
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Tan J, Townsend K, Lue LF, Sun N, Zeng J, Mori T, Shytle D, Morgan D, Town T. P3-410 Regulation of the innate and adaptive activation of microglia in responses to Aβ by CD40 signaling. Neurobiol Aging 2004. [DOI: 10.1016/s0197-4580(04)81557-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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412
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Garcia MF, Gordon MN, Hutton M, Lewis J, McGowan E, Dickey CA, Morgan D, Arendash GW. The retinal degeneration (rd) gene seriously impairs spatial cognitive performance in normal and Alzheimer's transgenic mice. Neuroreport 2004; 15:73-7. [PMID: 15106834 DOI: 10.1097/00001756-200401190-00015] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
To determine the effects of the recessive retinal degeneration (rd) gene on behavioral performance, three Alzheimer's transgenic lines (APPsw, P301L, APPsw + P301L) and non-transgenic littermates were evaluated in a comprehensive behavioral battery between 5 and 8.5 months of age. For all four genotypes collectively, rd homozygosity resulted in profound impairment in spatial cognitive tasks requiring visual acuity (Morris maze, platform recognition, and radial arm water maze). Non-transgenic and P301L mutant tau mice contributed most to this rd effect since heterozygous and wild type mice performed well. By contrast, spatial cognitive performance of both APPsw-expressing lines was often impaired, irrespective of rd status. Sensorimotor performance was unaffected by rd homozygosity, while rd effects on anxiety were genotype-dependent (less anxiety in NT, APPsw; more anxiety in P301L, APPsw + P301L). Our results strongly encourage rd screening of genetically manipulated mouse lines produced from rd-carrying strain backgrounds to avoid serious potential confounds in the interpretation of spatially based cognitive performance.
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413
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Silfen R, Ritz M, Morgan D, Southwick G. Simple solution for pectus excavatum repair. Plast Reconstr Surg 2004; 113:1870-1. [PMID: 15114169 DOI: 10.1097/01.prs.0000119870.21038.3f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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414
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Leddin D, Hunt R, Champion M, Cockeram A, Flook N, Gould M, Kim YI, Love J, Morgan D, Natsheh S, Sadowski D. Canadian Association of Gastroenterology and the Canadian Digestive Health Foundation: Guidelines on colon cancer screening. CANADIAN JOURNAL OF GASTROENTEROLOGY = JOURNAL CANADIEN DE GASTROENTEROLOGIE 2004; 18:93-9. [PMID: 14997217 DOI: 10.1155/2004/983459] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Colorectal cancer is the third most prevalent cancer affecting both men and women in Canada. Many of these cancers are preventable, and the Canadian Association of Gastroenterology (CAG) and the Canadian Digestive Health Foundation (CDHF) strongly support the establishment of screening programs for colorectal cancer. These guidelines discuss a number of screening options, listing the advantages and disadvantages of each. Ultimately, the test that is used for screening should be determined by patient preference, current evidence and local resources.
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415
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Blamey R, Chetti U, George D, Morgan D, Mitchell M. Update of the BASO II trial of primary treatment of tumours of excellent prognosis. EJC Suppl 2004. [DOI: 10.1016/s1359-6349(04)90963-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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416
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Morgan D. Mad or bad? A critique of proposals for managing dangerously disordered people. JOURNAL OF COMMUNITY & APPLIED SOCIAL PSYCHOLOGY 2004. [DOI: 10.1002/casp.768] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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417
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Townsend KP, Shytle DR, Bai Y, San N, Zeng J, Freeman M, Mori T, Fernandez F, Morgan D, Sanberg P, Tan J. Lovastatin modulation of microglial activation via suppression of functional CD40 expression. J Neurosci Res 2004; 78:167-76. [PMID: 15378516 DOI: 10.1002/jnr.20234] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Recent studies have shown that the 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) possess antiinflammatory and immunomodulatory properties, distinct from their action of lowering serum lipid levels. Moreover, results of epidemiological studies suggest that long-term use of statins is associated with a decreased risk for Alzheimer's disease (AD). Interestingly, lovastatin (one of the most commonly used anticholesterol drugs) treatment of vascular-derived cells has been reported to antagonize activation of the Janus kinase (JAK)/signal transducer and activator of transcription (STAT) signaling pathway, and it is well known that the JAK/STAT pathway plays a central role in interferon-gamma (IFN-gamma)-induced microglial CD40 expression. We and others have previously reported that microglial CD40 expression is significantly induced by IFN-gamma and amyloid-beta (Abeta) peptide. Moreover, it has been shown that CD40 signaling is critically involved in microglia-related immune responses in the CNS. In this study, we examined the putative role of lovastatin in modulation of CD40 expression and its signaling in cultured microglia. RT-PCR, Western immunoblotting, and flow cytometry data show that lovastatin suppresses IFN-gamma-induced CD40 expression. Additionally, lovastatin markedly inhibits IFN-gamma-induced phosphorylation of JAK/STAT1. Furthermore, lovastatin is able to suppress microglial tumor necrosis factor-alpha, interleukin (IL)-beta1 and IL-6 production promoted either by IFN-gamma or by Abeta peptide challenge in the presence of CD40 cross-linking. To characterize further lovastatin's effect on microglial function, we examined microglial phagocytic capability following CD40 cross-linking. Data reveal that lovastatin markedly attenuates CD40-mediated inhibition of microglial phagocytosis of Abeta. These results provide an insight into the mechanism of the beneficial effects of lovastatin in neurodegenerative disorders, particularly Alzheimer's disease.
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418
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Morgan D. Recent new products or product changes. J Tissue Viability 2004. [DOI: 10.1016/s0965-206x(04)41008-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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419
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Morgan D, Bollt EM, Schwartz IB. Constructing constrained invariant sets in multiscale continuum systems. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 68:056210. [PMID: 14682874 DOI: 10.1103/physreve.68.056210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2003] [Revised: 07/29/2003] [Indexed: 05/24/2023]
Abstract
We present a method that we name the constrained invariant manifold method, a visualization tool to construct stable and unstable invariant sets of a map or flow, where the invariant sets are constrained to lie on a slow invariant manifold. The construction of stable and unstable sets constrained to an unstable slow manifold is exemplified in a singularly perturbed model arising from a structural-mechanical system consisting of a pendulum coupled to a viscoelastic rod. Additionally, we extend the step and stagger method [D. Sweet, H. Nusse, and J. Yorke, Phys. Rev. Lett. 86, 2261 (2001)] to calculate a delta pseudoorbit on a chaotic saddle constrained to the slow manifold in order to be able to compute the Lyapunov exponents of the saddle.
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420
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421
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Balachandran D, Morgan D, Ceder G, van de Walle A. First-principles study of the structure of stoichiometric and Mn-deficient MnO2. J SOLID STATE CHEM 2003. [DOI: 10.1016/s0022-4596(03)00023-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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422
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Joseph JA, Denisova NA, Arendash G, Gordon M, Diamond D, Shukitt-Hale B, Morgan D. Blueberry supplementation enhances signaling and prevents behavioral deficits in an Alzheimer disease model. Nutr Neurosci 2003; 6:153-62. [PMID: 12793519 DOI: 10.1080/1028415031000111282] [Citation(s) in RCA: 213] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Previously, we showed that blueberry (BB) supplementation reversed the deleterious effects of aging on motor behavior and neuronal signaling in senescent rodents. We now report that BB-fed (from 4 months of age) APP + PS1 transgenic mice showed no deficits in Y-maze performance (at 12 months of age) with no alterations in amyloid beta burden. It appeared that the protective mechanisms are derived from BB-induced enhancement of memory-associated neuronal signaling (e.g. extracellular signal-regulated kinase) and alterations in neutral sphingomyelin-specific phospholipase C activity. Thus, our data indicate for the first time that it may be possible to overcome genetic predispositions to Alzheimer disease through diet.
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423
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Austin L, Arendash GW, Gordon MN, Diamond DM, DiCarlo G, Dickey C, Ugen K, Morgan D. Short-term beta-amyloid vaccinations do not improve cognitive performance in cognitively impaired APP + PS1 mice. Behav Neurosci 2003; 117:478-84. [PMID: 12802876 DOI: 10.1037/0735-7044.117.3.478] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Prior work demonstrated that beta-amyloid (A beta) immunotherapy for 8 months prevented cognitive impairment in 16-month-old APP + PS1 transgenic mice. In the present study, 4 immunizations administered biweekly to cognitively impaired 16-month-old transgenic mice could not reverse deficits in working memory or reference memory in the radial arm water maze or in visual platform recognition, possibly because of inadequate antibody exposure. Nontransgenic mice showed cognitive savings between the 16- and 18-month test periods, but the transgenic groups did not. These results suggest that a longer period of active immunotherapy, or passive immunization, may be required to provide sufficient antibody titers to improve cognition in older transgenic mice. A beta-based immunotherapy for Alzheimer's disease will likely be more successful prophylactically than therapeutically.
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424
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McGuinness DS, Wasserscheid P, Keim W, Morgan D, Dixon JT, Bollmann A, Maumela H, Hess F, Englert U. First Cr(III)-SNS complexes and their use as highly efficient catalysts for the trimerization of ethylene to 1-hexene. J Am Chem Soc 2003; 125:5272-3. [PMID: 12720428 DOI: 10.1021/ja034752f] [Citation(s) in RCA: 226] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cr(III) complexes of tridentate SNS ligands have been prepared and evaluated as catalysts for ethylene trimerization, with several giving very high activity and excellent selectivity toward 1-hexene when activated with methylaluminoxane. The new complexes illustrate the potential of sulfur-based ligands on early transition metals for catalysis.
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425
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Abstract
AIMS Ultrasound is a non-invasive, non-ionising radiation modality which is highly successful at soft tissue imaging. Groin pain from an occult hernia can be a difficult clinical diagnosis made easier by good imaging. The aim of this study was to demonstrate the accuracy of ultrasound in diagnosing and typing the groin hernia, which could lead to its justification of use in the imaging of the occult hernia. PATIENTS AND METHODS A total of 118 patients with a clinical diagnosis of a groin hernia, prospectively underwent a blinded, ultrasound examination of the groin. All patients underwent surgery and these findings were compared with the ultrasound results. RESULTS 120 symptomatic groins in 118 patients underwent surgery. Ultrasound diagnosed 118 hernias and there were two normal ultrasound examinations. Surgery confirmed the same two patients to be normal - ultrasound sensitivity for all hernias was 100% with 100% specificity. Two femoral hernias were seen in this study, both correctly identified at ultrasound. Of the inguinal hernias, ultrasound identified 36 of 42 direct hernias (sensitivity 86%, specificity 97%) and 72 of 74 indirect hernias (sensitivity 97%, specificity 87%) CONCLUSIONS This study confirms that ultrasound can accurately diagnose groin hernias and this may justify its use in the assessment of the occult hernia.
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