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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2550-2553 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present the first results of use of the high power x-rays from an insertion device beamline at the Advanced Photon Source for welding. X-rays with energies between 3 and 200 keV and power densities greater than 10 000 W/cm2 can penetrate deeply into most materials and thus can be used as volumetric heating sources. In this article we show results of bead-on-plate welds of a 3.3-mm-thick Al/Al2O3 metal-matrix composite and discuss results obtained for other materials. The potential of x-rays for welding is also discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1523-5378
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The mode of transmission of Helicobacter pylori is unclear, but it has been shown that gastroenterologists are at a greater risk of acquiring the infection when performing endoscopy. The current study was designed to assess the risk H. pylori infection in respiratory physicians performing bronchoscopy compared to an at-risk group of gastroenterologists. We were interested in identifying whether the oral cavity is important in the transmission of H. pylori.〈section xml:id="abs1-2"〉〈title type="main"〉Materials and Methods.Respiratory physicians and gastroenterologists in southern England and Wales were invited to participate in the study. Medical, personal, and professional details were recorded, and H. pylori status was established using a carbon 13 urea breath test.〈section xml:id="abs1-3"〉〈title type="main"〉Results.The study included 30 gastroenterologists and 30 respiratory physicians. The groups were similar for age (mean age, 46.2 years [SD 8.7] and 43.9 years [SD 8.5], respectively), number of years in practice (mean, 16.1 [6.8] and 13.2 [5.5], respectively), amount of Third-World travel, and glove and drug use (antacids, H2 antagonists, proton pump inhibitors, promotility agents, and bismuth). The prevalence of upper gastrointestinal symptoms (indigestion, heartburn, abdominal pain) and history of previous peptic ulcer or hiatus hernia were similar for both groups. Fifteen of thirty gastroenterologists and three of thirty respiratory physicians had positive breath tests (χ square, p 〈 .001, 1 df  ). There was no relation between age and H. pylori status. Within the group of gastroenterologists, performance of endoscopy without gloves for longer than 7 years was associated with an increased prevalence of infection (〉7 years, 11 of 15 breath-test-positive; 〈7 years, 4 of 15 breath-test-positive [χ square, p = .01, 1 df  ]).〈section xml:id="abs1-4"〉〈title type="main"〉Conclusions.Gastroenterologists in this study appeared to be at risk of infection, whereas respiratory physicians are not. Gastroenterologists who wear gloves during endoscopy appear to be at lower risk of H. pylori infection.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science
    Wound repair and regeneration 5 (1997), S. 0 
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Background: Rapid recovery protocols for coronary artery bypass grafting (CABG) have resulted in major decreases in postoperative hospital length of stay (LOS) when applied to younger patients undergoing elective procedures. However, the effectiveness of rapid recovery protocols when applied to octogenarians has not been thoroughly studied. Methods: Thirty-seven consecutive octogenarians underwent isolated CABG utilizing cardiopulmonary bypass (CPB). A protocol emphasizing preoperative placement of the intra-aortic balloon pump, reduced CPB time, early extubation, perioperative steroids, thyroid hormone, and aggressive postoperative diuresis was used. Results: The 30-day operative mortality for the entire series was 5.4%. Twenty-five patients (71%, group I) were discharged in 〈 10 days postoperatively (average LOS of 6.3 ± 1.6 days), while ten patients (29%, group II) were discharged at 10 or more days postoperatively (average LOS of 20.3 ± 8.0, p 〈 0.001). Patients in group II were found to have a higher incidence of obesity (50% vs 4%, p 〈 0.01), symptomatic peripheral vascular disease (60% vs 8%, p 〈 0.01), and preoperative ambulatory difficulties (50% vs 0%, p 〈 0.01). The incidence of complications was 31% for the entire series, with no differences between the groups. Conclusion: Octogenarians performed well under a rapid recovery protocol, with 71% being discharged in 〈 10 days postoperatively, while patients with obesity, symptomatic peripheral vascular disease, and ambulatory difficulties rehabilitated more slowly.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 68 (1997), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Noradrenergic neuronal networks originating in the locus coeruleus have been implicated in the stress response. In order to study this system in vitro, we have employed a locus coeruleus-like cell line, CATH.a, and have determined the effect of dexamethasone on receptor-mediated second messenger responses. The CATH.a cell line produced increases in intracellular cyclic AMP conversion in response to corticotrophin-releasing factor (EC50 = 6.93 ± 1.26 nM, maximum conversion = 4.11 ± 0.20%) and vasoactive intestinal polypeptide (EC50 = 240 ± 40 nM, maximum conversion = 8.92 ± 1.24%). Forskolin (10 µM) increased conversion from 0.48 ± 0.05 to 6.39 ± 0.38%. The α2-adrenoceptor agonist 5-bromo-N-(4,5-dihydro-1H-imidazol-2-yl)-6-quinoxalinamine (UK14304) inhibited the forskolin response with an IC50 of 6.76 ± 0.11 nM. Carbachol increased total 3H-labelled inositol phosphate accumulation to a maximum of 3.01 ± 0.79 fold basal (EC50 = 7.94 ± 0.14 µM). Bradykinin produced a maximum 1.81 ± 0.05 fold basal stimulation of phosphoinositide hydrolysis (EC50 = 9.12 ± 0.16 nM). Both carbachol and bradykinin increased intracellular Ca2+ concentration probably via a combination of mobilisation of intracellular stores and gating of extracellular Ca2+. Incubation for 24 h with the glucocorticoid receptor agonist, dexamethasone (1 µM), significantly potentiated the receptor-mediated phosphoinositide responses to all the agents tested; however, of the receptor-mediated increases in cyclic AMP conversion, only the vasoactive intestinal polypeptide response was potentiated. These results show that the CATH.a cell line displays some of the properties expected of locus coeruleus neurons and that glucocorticoid receptor stimulation selectively modulates receptor-mediated increases in second messenger formation.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2389-2391 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chemical states of a 140 μm silicon carbide fiber are determined by soft x-ray photo-absorption spectroscopy, using a magnetic projection photoelectron microscope, performed on the surface obtained by fracturing. The spectrum of the carbon core of the fiber has prominent π* and σ* resonance peaks and is very similar to that measured on highly oriented pyrolitic graphite, indicating a graphitic nature of the carbon core. The spectrum of the silicon carbide coating of the fiber reveals similar features to those of single-crystal silicon carbide, indicating that this coating is in the crystalline or polycrystalline phase. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4120-4123 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a simple, piezoelectric shear-force detection for controlling the tip–sample distance in near-field optical microscopes. The fiber is glued to a V-shaped piezoelectric cantilever and the assembly is fixed to a piezoelectric plate. The piezoelectric plate excites the fiber at resonance, while the piezoelectric cantilever of small mass detects the fiber motion with a high sensitivity. When the fiber approaches within, typically, 10–20 nm above the sample, shear forces cause the signal to reduce. The only signal processing before injecting it into the feedback loop is demodulation by a lock-in amplifier. The high signal-to-background allows the fiber resonance to be identified easily. We demonstrate the performance of our system with shear-force images of two test patterns. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2034-2036 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Moving space charge field (photo-emf) effects are observed in standard and low temperature grown GaAs multiple quantum well (MQW) samples in which dc photocurrents are generated by constant speed moving optical interference patterns. Experiments reveal an enhanced detection bandwidth for optical doppler frequency measurements compared to previously studied bulk II-VI and III-V materials due to the higher quantum efficiency and optical absorption of GaAs MQWs, in spite of their reduced carrier mobility-lifetime product values resulting mainly from the significantly shorter free carrier lifetimes. The high defect density of low temperature grown MQWs can also yield large field-of-view and, for optical ultrasound detections, high cutoff frequency. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0009-6407
    Source: Cambridge Journals Digital Archives
    Topics: History , Theology and Religious Studies
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 24 (1997), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The purpose of this study was to evaluate clinical, microbiological, and gingival crevicular fluid (GCF) profiles in periodontitis-resistant and periodontitis-susceptible subjects during 4 weeks of experimental gingivitis. Experimental groups of similar ages were defined as gingivitis controls (GC; n=10) and history of rapidly progressive periodontitis (RPP; n=10). respectively. Prior to baseline, all subjects achieved good plaque control (plaque index (P1I) ∼0) and gingival health (gingival index (GI)=0). and had probing depths ≤4 mm on experimental teeth. For 4 weeks after baseline, oral hygiene around maxillary 2nd premolar and 1st molar teeth was inhibited by a plaque guard. The plaque guard was removed weekly for GCF sampling to determine interleukin (IL)-1β and prostaglandin (PG)E2 amounts by ELISAs. In addition. PII. GI. probing depth, and gingival recession measurements were made. Subgingival plaque darkfield microscopy and DNA probe analysis also were performed. Results indicated that clinical signs of inflammation, microbiological patterns and GCF profiles progressed similarly in both groups. However, plaque accumulated more rapidly in the susceptible subjects. PII in RPP at 4 weeks was 2.1±0.1 compared to 1.5±0.2 in GC, with an incidence of PII〉1 of 100% versus 50%, respectively (logistic regression; p〈0.000l). Hence, the clinical, microbiological and host factors selected for this study were unrelated to previous susceptibility to periodontitis when evaluated in the experimental gingivitis model. However, the increased rate of plaque accumulation, following thorough plaque removal, in RPP patients suggests a potential factor in disease recurrence in these susceptible subjects.
    Type of Medium: Electronic Resource
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