8,906 research outputs found
Constructing vertex-disjoint paths in (n,k)-star graphs
No full text[[abstract]]This work describes a novel routing algorithm for constructing a container of width n - 1 between a pair of vertices in an (n, k)-star graph with connectivity it - 1. Since Lin et al. [T.C. Lin, D.R. Duh, H.C. Cheng, Wide diameter of (n, k)-star networks, in: Proceedings of the International Conference on Computing, Communications and Control Technologies, vol. 5, 2004 pp. 160-165] already calculated the wide diameters in (n, n - 1)-star and (n, 1)-star graphs, this study only considers an (n, k)-star with 2 <= k <= n - 2. The length of the longest container among all constructed containers serves as the upper bound of the wide diameter of an (n, k)-star graph. The lower bound of the wide diameter of an (n, k)-star graph with 2 <= k <= [n/2] and the lower bound of the wide diameter of a regular graph with a connectivity of 2 or above are also computed. Measurement results indicate that the wide diameter of an (n, k)-star graph is its diameter plus 2 for 2 <= k <= [n/2], or its diameter plus a value between 1 and 2 for [n/2] + 1 <= k <= n - 2. (c) 2007 Elsevier Inc. All rights reserved.[[note]]SC
Silicon-germanium spherical quantum dot infrared photodetectors prepared by the combination of bottom-up and top-down technologies
No full textTC-CPE “hijacks” WT CPE in N2A cells.
No full text(A) Representative Western blot analysis of CPE expression from cell lysates after various treatments for 24 h in N2A cells. (B) Bar graphs show the quantification of CPE expression from cell lysates normalized to actin. (C) Representative Western blot analysis of secreted CPE after various treatments for 24 h in N2A cells. (D) Bar graphs show the quantification of secreted CPE levels. For CPE secretion, one-way ANOVA (F(3,8) = 164.9, p(E) N2A cells were transfected with EV, WT-CPE or WT-CPE +TC-CPE for 24 h, and then 100 μM H2O2 was added for 48 h. LDH release assay indicated that the neuroprotection of WT-CPE against oxidative stress was not affected by co-transfection with TC-CPE in N2A cells. One-way ANOVA analysis followed by Tukey’s multiple comparison test: F(2,12) = 7.139, p < 0.05, n = 5.</p
A novel fluorescence-based multiplex PCR assay for rapid simultaneous detection of CEBPA mutations and NPM mutations in patients with acute myeloid leukemias.
No full textAmbiguous Anatomy and Its Pain
No full textQuestion: A 46-year-old woman presented to the emergency department with a 1-day history of sudden onset colicky central abdominal pain. She had been passing flatus until that morning and her last bowel motion was the day before. She had been tolerating diet without any nausea or vomiting. She had no significant medical history and had otherwise been previously fit and well throughout her life. She had no previous surgery and no previous endoscopic procedures. She was an active smoker. Her vital signs were normal on surgical review. Initially she appeared comfortable however on serial observations she appeared to develop waves of colicky and severe cramping pain. There was no abdominal distension noted. Her abdomen was generally tender maximally in the epigastrium with localized guarding. Her white cell count was 12.9 × 109/L and her C-reactive protein was 2.0 mg/L. Her serum electrolytes, renal function, liver function tests, and lipase were all normal.Full Tex
Mechanisms for accumulation and migration of technetium-99 in saltmarsh sediments
No full textThis thesis describes the development of analytical methods for both the bulk determination of 99Tc, and determination of 99Tc in sequential extracts from sediments. These methods have been used to collect data, which, along with trace and major element data have been used to interpret the mechanisms for 99Tc input, migration and accumulation in saltmarshes. The inventory of 99Tc stored in the Thornflatt Saltmarsh, Esk Estuary has also been determined. The routine determination of 99Tc in bulk samples uses 99mTc as a yield monitor. Samples are ignited stepwise to 550°C and the 99Tc is extracted using 8M nitric acid. Many contaminants are precipitated with Fe(OH)3 and the Tc in the supernant is pre-concentrated and further purified using anion-exchange chromatography. Final separation of Tc from Ru is achieved by extraction of Tc into 5% TnOA in xylene from 2M sulphuric acid. The yield is determined by γ-spectrometric analysis of 99mTc. Determination of 99Tc is made by liquid scintillation counting. Typical recoveries are in the order of 70-95% and the method has a detection limit of 1.7 Bq/kg for a sample size of 10g. Determination of Tc in sequential extracts uses operationally defined procedures to extract: exchangeable Tc, reducible Tc and oxidisable Tc. An initial water wash is used to extract any occluded Tc and a final leach in 8 M nitric acid is used to dissolve any residual Tc. The isolation of 99Tc uses TEVA resin for Extracts 1-4 and the decontamination procedure developed for bulk analysis for Extract 5. 99mTc was used as a yield monitor, and determination of 99Tc is by liquid scintillation counting. Limits of detection were dependent on the amount of 99mTc tracer used but were found to be as low as 2.4 Bq/kg for a sample size of 2g. A study was made of the mechanisms responsible for the accumulation and migration of Tc in estuarine sediments using sediments collected from saltmarshes at Thornflatt, Carlaverock and the Ribble Estuary. 99Tc was present at determinable activities in all the sediment cores taken from these sites. Good correlations between Tc and CaO as well as CO3 concentrations and poor correlation between Tc and radionuclides adsorbed to inorganic detritus infer a direct input of 99Tc to marsh sediments. Determination of 99Tc in biota living on the marsh also showed that this was not a significant pathway for input of Tc to the sediments. Sequential extraction data imply sorption to an organic fraction of the sediment. Stable element and sequential extraction data indicates that Tc is readily oxidised and remobilised before reprecipitation where redox conditions are favourable. Data indicate a reduction potential between those of the MnIV to MnII reaction and the FeIII to FeII reaction is necessary for re-accumulation to occur, as suggested by published thermodynamic data. Data collected from reducing sediments imply that similar mechanisms are responsible for the accumulation of Mn (e.g. reduction by sulphate reducing bacteria) and the accumulation of Tc. The inventory of 99Tc held within the Thornflatt saltmarsh is proportionally less than that of 137Cs or 241Am when compared to discharges from Sellafield. However a higher proportion of 99Tc is transferred from Seliafield and incorporated into saltmarsh sediments than is suggested by previously published standard distribution coefficient data. Saltmarsh sediments are therefore a more important sink of 99Tc than extrapolations made from inventories of other radionuclides would suggest
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