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Burke V, Nakyanjo N, Ddaaki W, Hutchinson N, Payne C, Nalugoda F, Kennedy C. HIV Self-Testing Values and Preferences in Rakai, Uganda: A Qualitative
Study. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Hutchinson N, Marshall K, Espley H, Ionescu AA. P184 Modified WHO safety checklist for Pleural Interventions – preventing system errors. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Kong R, Trimmings A, Hutchinson N, Gill R, Agarwal S, Davidson S, Arcari M. Consensus recommendations for using the Multiplate®for platelet function monitoring before cardiac surgery. Int J Lab Hematol 2014; 37:143-7. [DOI: 10.1111/ijlh.12279] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Accepted: 06/24/2014] [Indexed: 12/31/2022]
Affiliation(s)
- R. Kong
- Royal Sussex County Hospital; Brighton UK
| | | | | | - R. Gill
- University Hospital Southampton; Southampton UK
| | - S. Agarwal
- Liverpool Heart and Chest Hospital; Liverpool UK
| | - S. Davidson
- Royal Brompton and Harefield NHSFT; London UK
| | - M. Arcari
- UPMC Beacon Hospital; Dublin Ireland
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Barron A, Hutchinson N. Cardiac Anaesthesia; Thoracic Anaesthesia. Anaesthesia 2012. [DOI: 10.1111/j.1365-2044.2011.07048.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Khawaja MZ, Rajani R, Cook A, Khavandi A, Moynagh A, Chowdhary S, Spence MS, Brown S, Khan SQ, Walker N, Trivedi U, Hutchinson N, De Belder AJ, Moat N, Blackman DJ, Levy RD, Manoharan G, Roberts D, Khogali SS, Crean P, Brecker SJ, Baumbach A, Mullen M, Laborde JC, Hildick-Smith D. Permanent pacemaker insertion after CoreValve transcatheter aortic valve implantation: incidence and contributing factors (the UK CoreValve Collaborative). Circulation 2011; 123:951-60. [PMID: 21339482 DOI: 10.1161/circulationaha.109.927152] [Citation(s) in RCA: 251] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Permanent pacemaker (PPM) requirement is a recognized complication of transcatheter aortic valve implantation. We assessed the UK incidence of permanent pacing within 30 days of CoreValve implantation and formulated an anatomic and electrophysiological model. METHODS AND RESULTS Data from 270 patients at 10 centers in the United Kingdom were examined. Twenty-five patients (8%) had preexisting PPMs; 2 patients had incomplete data. The remaining 243 were 81.3±6.7 years of age; 50.6% were male. QRS duration increased from 105±23 to 135±29 milliseconds (P<0.01). Left bundle-branch block incidence was 13% at baseline and 61% after the procedure (P<0.001). Eighty-one patients (33.3%) required a PPM within 30 days. Rates of pacing according to preexisting ECG abnormalities were as follows: right bundle-branch block, 65.2%; left bundle-branch block, 43.75%; normal QRS, 27.6%. Among patients who required PPM implantation, the median time to insertion was 4.0 days (interquartile range, 2.0 to 7.75 days). Multivariable analysis revealed that periprocedural atrioventricular block (odds ratio, 6.29; 95% confidence interval, 3.55 to 11.15), balloon predilatation (odds ratio, 2.68; 95% confidence interval, 2.00 to 3.47), use of the larger (29 mm) CoreValve prosthesis (odds ratio, 2.50; 95% confidence interval, 1.22 to 5.11), interventricular septum diameter (odds ratio, 1.18; 95% confidence interval, 1.10 to 3.06), and prolonged QRS duration (odds ratio, 3.45; 95% confidence interval, 1.61 to 7.40) were independently associated with the need for PPM. CONCLUSION One third of patients undergoing a CoreValve transcatheter aortic valve implantation procedure require a PPM within 30 days. Periprocedural atrioventricular block, balloon predilatation, use of the larger CoreValve prosthesis, increased interventricular septum diameter and prolonged QRS duration were associated with the need for PPM.
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Affiliation(s)
- M Z Khawaja
- UK CoreValve Collaborative, Sussex Cardiac Centre, Brighton & Sussex University Hospital Trust, Eastern Road, Brighton, East Sussex, BN2 5BE, UK
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Flesch L, Demmel K, Davies S, Nagarajan R, Hawkins D, Hutchinson N, Bierman L, Fellers E, Hodapp S, O'Hara E, Shelton C, Curry C, Giesken R, Spear S, Wheeler D, Giaccone M. The Power of Process Improvement Methodology on a Highly Complex Pediatric Bone Marrow Transplant Unit's Catheter Associated Blood Stream Infection Rates. Biol Blood Marrow Transplant 2011. [DOI: 10.1016/j.bbmt.2010.12.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hutchinson N, Chhatre S, Baldascini H, Davies JL, Bracewell DG, Hoare M. Ultra scale-down approach to correct dispersive and retentive effects in small-scale columns when predicting larger scale elution profiles. Biotechnol Prog 2009; 25:1103-10. [DOI: 10.1002/btpr.172] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Baumann F, Henderson R, Morrison S, Brown M, Hutchinson N, Douglas J, Robinson P, McCombe P. Use of respiratory function tests to predict survival in amyotrophic lateral sclerosis. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/17482960902991773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hutchinson N, Sorter M, Connelly B, Myers S, Brilli R. Reduction in Ventilator-Associated Pneumonia Following Application of a Pediatric Ventilatory Care Bundle. Am J Infect Control 2006. [DOI: 10.1016/j.ajic.2006.05.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hutchinson N, Bingham N, Murrell N, Farid S, Hoare M. Shear stress analysis of mammalian cell suspensions for prediction of industrial centrifugation and its verification. Biotechnol Bioeng 2006; 95:483-91. [PMID: 16767778 DOI: 10.1002/bit.21029] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This article describes the use of ultra scale-down studies requiring milliliter quantities of process material to study the clarification of mammalian cell culture broths using industrial-scale continuous centrifuges during the manufacture of a monoclonal antibody for therapeutic use. Samples were pretreated in a small high-speed rotating-disc device in order to mimic the effect on the cells of shear stresses in the feed zone of the industrial scale centrifuges. The use of this feed mimic was shown to predict a reduction of the clarification efficiency by significantly reducing the particle size distribution of the mammalian cells. The combined use of the rotating-disc device and a laboratory-scale test tube centrifuge successfully predicted the separation characteristics of industrial-scale, disc stack centrifuges operating with different feed zones. A 70% reduction in flow rate in the industrial-scale centrifuge was shown to arise from shear effects. A predicted 2.5-fold increase in throughput for the same clarification performance, achieved by the change to a centrifuge using a feed zone designed to give gentler acceleration of the bioprocess fluid, was also verified at large-scale.
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Affiliation(s)
- N Hutchinson
- Department of Biochemical Engineering, The Advanced Centre for Biochemical Engineering, University College London, Torrington Place, London, WC1E 7JE, United Kingdom
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Ruan J, Xie QW, Hutchinson N, Cho H, Wolfe GC, Nathan C. Inducible nitric oxide synthase requires both the canonical calmodulin-binding domain and additional sequences in order to bind calmodulin and produce nitric oxide in the absence of free Ca2+. J Biol Chem 1996; 271:22679-86. [PMID: 8798440 DOI: 10.1074/jbc.271.37.22679] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
All three mammalian isoforms of nitric oxide synthase (NOS) must bind calmodulin (CaM) for enzymatic activity. Only NOS2 (the inducible isoform, iNOS) does so at the low levels of free Ca2+ in resting cells and when almost all Ca2+ is chelated in cell-free preparations. To test directly whether the predicted CaM-binding region of mouse NOS2 accounts for its Ca2+ independence, we prepared chimeric NOS's in which mouse NOS2 residues 503-532 were reciprocally exchanged with the corresponding residues 725-754 of rat NOS1 (neuronal NOS). Unlike either parent, both chimeras required an intermediate level of free Ca2+ to bind CaM and generate NO. In cell lysates, the concentration of Ca2+ necessary for half-maximal activity (EC50) was approximately 0 for NOS2, 200-300 n for NOS1, and 7-10 n for the chimeras. Results were similar when the region exchanged was enlarged by 7-8 residues toward the amino terminus. In contrast, when the carboxyl-terminal half of NOS2 (residues 454-1144) was replaced with that of NOS1 (residues 675-1429), the resulting chimera resembled NOS1 (EC50, 200-300 n free Ca2+). Truncation analysis suggested that NOS2 residues within the sequence 484-726 were required for Ca2+-independent CaM-binding. Thus, both the canonical CaM-binding domain and additional residues within the region 484-726 are necessary for NOS2's ability to bind CaM and produce NO when Ca2+ levels approach zero.
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Affiliation(s)
- J Ruan
- Beatrice and Samuel A. Seaver Laboratory, Department of Medicine, Cornell University Medical College, New York, New York 10021, USA
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Michaud-Tomson L, Pangrazi RP, Friedman G, Hutchinson N. CHILDHOOD DEPRESSIVE SYMPTOMS, PHYSICAL ACTIVITY AND GOOD HEALTH808. Med Sci Sports Exerc 1996. [DOI: 10.1097/00005768-199605001-00806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Smith RL, Donlon BS, Gupta MK, Mohtai M, Das P, Carter DR, Cooke J, Gibbons G, Hutchinson N, Schurman DJ. Effects of fluid-induced shear on articular chondrocyte morphology and metabolism in vitro. J Orthop Res 1995; 13:824-31. [PMID: 8544017 DOI: 10.1002/jor.1100130604] [Citation(s) in RCA: 188] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This study tested the effects of fluid-induced shear on high density monolayer cultures of adult articular chondrocytes. Fluid-induced shear (1.6 Pa) was applied by cone viscometer to normal human and bovine articular chondrocytes for periods of 24, 48, and 72 hours. At 48 and 72 hours, fluid-induced shear caused individual chondrocytes to elongate and align tangential to the direction of cone rotation. Fluid-induced shear stimulated glycosaminoglycan synthesis by 2-fold (p < 0.05) and increased the length of newly synthesized chains in human and bovine chondrocytes. In human chondrocytes, the hydrodynamic size of newly synthesized proteoglycans also was increased. After 48 hours of fluid-induced shear, the release of prostaglandin E2 from the chondrocytes was increased 10 to 20-fold. In human chondrocytes, mRNA signal levels for tissue inhibitor of metalloproteinase increased 9-fold in response to shear compared with the controls. In contrast, mRNA signal levels for the neutral metalloproteinases, collagenase, stromelysin, and 72 kD gelatinase, did not show such major changes. This study demonstrated that articular chondrocyte metabolism responds directly to physical stimulation in vitro and suggests that mechanical loading may directly influence cartilage homeostasis in vivo.
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Affiliation(s)
- R L Smith
- Department of Functional Restoration, Veterans Affairs Medical Center, Palo Alto, California, USA
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MacMicking JD, Nathan C, Hom G, Chartrain N, Fletcher DS, Trumbauer M, Stevens K, Xie QW, Sokol K, Hutchinson N. Altered responses to bacterial infection and endotoxic shock in mice lacking inducible nitric oxide synthase. Cell 1995; 81:641-50. [PMID: 7538909 DOI: 10.1016/0092-8674(95)90085-3] [Citation(s) in RCA: 1076] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Mice deficient in inducible nitric oxide synthase (iNOS) were generated to test the idea that iNOS defends the host against infectious agents and tumor cells at the risk of contributing to tissue damage and shock. iNOS-/-mice failed to restrain the replication of Listeria monocytogenes in vivo or lymphoma cells in vitro. Bacterial endotoxic lipopolysaccharide (LPS) caused shock and death in anesthetized wild-type mice, but in iNOS-/-mice, the fall in central arterial blood pressure was markedly attenuated and early death averted. However, unanesthetized iNOS-/-mice suffered as much LPS-induced liver damage as wild type, and when primed with Propionobacterium acnes and challenged with LPS, they succumbed at the same rate as wild type. Thus, there exist both iNOS-dependent and iNOS-independent routes to LPS-induced hypotension and death.
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Affiliation(s)
- J D MacMicking
- Beatrice and Samuel A. Seaver Laboratory, Department of Medicine, Cornell University Medical College, New York, New York 10021, USA
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Abstract
The
x
-kernel is a configurable operating system kernel designed to support experimentation in interprocess communication and distributed programming. The
x
-kernel's underlying architecture provides a rich set of abstractions that are used to construct and compose communication protocols. The architecture is interesting because the abstractions are both general enough to accommodate a wide range of protocols and efficient enough to provide a useful testbed in which protocol performance can be accurately measured.
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Kozinski AW, Ling SK, Hutchinson N, Halpern ME, Mattson T. Differential amplification of specific areas of phage T4 genome as revealed by hybridization to cloned genetic segments. Proc Natl Acad Sci U S A 1980; 77:5064-8. [PMID: 7001470 PMCID: PMC349996 DOI: 10.1073/pnas.77.9.5064] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Under various conditions, specific genetic areas of the phage T4 DNA molecule are preferentially and repeatedly replicated, resulting in the amplification of these areas. These areas are found to lie in the vicinity of the known origins of DNA replication.
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Hutchinson N, Kazic T, Lee SJ, Rayssiguier C, Emanuel BS, Kozinski AW. Late replication and recombination in the vegetative pool of T4. Cold Spring Harb Symp Quant Biol 1979; 43 Pt 1:517-23. [PMID: 289461 DOI: 10.1101/sqb.1979.043.01.057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The rates and extents of replication are the same for all members of the vegetative pool, whether already residing (progeny) or newly entered (superinfecting). Thus, no member of the pool is sequestered in a replicative complex. Amber N82 infections of nonpermissive host result in extensive breakdown of phage DNA. The extent of fragmentation observed depends on the multiplicity of infection and whether phage ligase is present. Hence, parental DNA suffers single-strand nicks which can be repaired by ligase only if recombination does not interfere. The physiological role of ligase in compensating for such nicks is reemphasized. Superinfecting genomes recombine very rapidly with progeny molecules whose combined lengths are approximately six times that of the superinfecting genomic fragment. The superinfecting phage does not replicate before recombining. Therefore, the lack of replication poses no barrier to efficient recombination.
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Laird CD, Chool WY, Cohen EH, Dickson E, Hutchinson N, Turner SH. Organization and transcription of DNA in chromosomes and mitochondria of Drosophila. Cold Spring Harb Symp Quant Biol 1974; 38:311-27. [PMID: 4208785 DOI: 10.1101/sqb.1974.038.01.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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