Traditionally the telecom industry has used clusters to meet its carrier-class requirements of high availability, reliability, and scalability, while relying on cost-effective hardware and software. ...Efficient cluster security is now an essential requirement and has not yet been addressed in a coherent fashion on clustered systems. This paper presents an approach for distributed security architecture that supports advanced security mechanisms for current and future security needs, targeted for carrier-class application servers running on clustered systems.
The levels of xenobiotics and trace elements in human breast cancer tissues and adjacent normal tissues were examined in 50 breast cancer patients. Cadmium, lead, zinc, copper and magnesium levels ...were determined by voltammetric (ASV) and spectrophotometric (AAS) methods. The study demonstrated that samples taken from the central regions of cancer generally had different concentration levels of xenobiotics and trace elements than normal tissues. The levels of lead, cadmium and zinc, copper and magnesium were all significantly higher in cancerous tissues as compared to the unaffected cells. Strong, statistically significant positive correlations between xenobiotics and trace elements were found, both in cancerous and healthy tissues. It was also noted that correlations in cancer tissues were more significant than those within normal tissues.
The purpose of this study was to examine the clinical application of traditional time scores and various derived indices from the Trail Making Test (TMT) in a sample of 571 patients with acute ...traumatic brain injury (TBI). Participants were classified into four injury severity groups. A clear linear relation between injury severity and TMT performance was demonstrated, with the more severely brain injured patients performing more poorly on most measures. Hierarchical logistic regression analysis of TMT time scores across binary extreme groups based on injury severity resulted in high classification rates for patients with very mild TBI (93.0% correctly classified) and low classification rates for patients with moderate to severe TBI (50.0% correctly classified). However, TMT derived indices did not provide a unique contribution to test interpretation beyond what is already available from Part A and B separately.
Portions of these data were presented at the American Psychological Association conference in August, 2001, San Francisco.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Elastography is a method that can be used to measure the elasticity of soft biological tissue and, ultimately, to detect cancerous tumors. In this paper, quantitative elastography is developed using ...a fast multi-scale approach. Results are presented in simulation and preliminary results are presented in experiment. The optimization methods of elastography are applied to measure noninvasively the arterial wall stiffness of a vessel as well as blood pressure. Simulation results are presented that confirm the accuracy of methods, and preliminary experimental results are presented that measure pressure within a cylindrical cavity in a phantom. Using ultrasound, these methods could provide noninvasive continuous measurement of blood pressure in major arteries and could give doctors another method with which to gather information about a patient's cardiovascular health.
Cobalt-induced alterations in hamster testes in vivo Lukac, Norbert; Massanyi, Peter; Zakrzewski, Marian ...
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering,
02/2007, Letnik:
42, Številka:
3
Journal Article
Recenzirano
The purpose of this study was to assess the effects of cobalt on the testicular structure of adult golden hamsters. Hamsters in group A received cobalt (CoCl
2
) in single intraperitoneal dose 20 ...mg/kg, in group B 10 mg/kg and in group C 5 mg CoCl
2
/kg body weight and were killed fourtyeight hours after cobalt administration. Afer a preparation of histological samples the results were compared with control. After a cobalt administration dilatation of blood capillaries in interstitium, undulation of basal membrane and occurrece of empty spaces in seminiferous epithelium was detected. Morphometric analysis showed that in all cobalt-threated groups the relative volume of seminiferous epithelium was significantly decreased. In the relative volume of interstitium a significant increase was found between control group and experimental groups. After cobalt administration we have found linear non-significant decrease. Evaluation of diameter seminiferous tubules found increase of this parameter in the all experimental group in comparison with control. Heigth of seminiferious epitelium was relatively constant and in all groups but the difference between control and group A was significant (P < 0.05). Analysis of the lumen diameter of seminiferous tubules detected significantly increase mainly group B. Evaluation of the number of cell nuclei per a constant area detected an increase of this parameter in experimental group. Results of this study report a negative effect of cobalt on structure and function of testes.
The object of this investigation was to demonstrate the utility of X-ray powder diffractometry (XRD) to study the kinetics of a complex pharmaceutical solid-state reaction wherein the reactant, ...product and intermediate phases were all simultaneously quantified.
Aminophylline monohydrate (I) decomposed to anhydrous theophylline (III) either directly or through an intermediate (anhydrous aminophylline, II). The reaction kinetics were studied isothermally at several temperatures ranging from 65 to 100 degrees C. By measuring the intensities of the XRD peaks unique to I, II and III, it was possible to simultaneously quantify the 3 phases during the entire reaction.
Assuming that all the reaction steps follow first-order kinetics. the three equations describing the concentrations of I, II and III as a function of time, were derived. By fitting the experimental data to these equations, it was possible to obtain the rate constants for the three reaction steps. The rate constants were obtained at different temperatures and were used to draw Arrhenius type plots from which the activation energies were determined. At lower temperatures (< 80 degrees C). the concentration of the intermediate phase, i.e., II, was low throughout the reaction while at higher temperatures (> 90 degrees C), there was rapid formation and accumulation of II during the early stages of the reaction. These differences could be attributed to the fact that k1 (I --> II) had a more pronounced temperature dependence than k2 (I --> III) and k3 (II --> II). The XRD results were confirmed with isothermal thermogravimetry.
Variable temperature XRD is a powerful tool to probe reaction kinetics in crystalline pharmaceuticals since it permits simultaneous quantification of multiple solid phases.
Synergistic effects of total ionizing dose and particle fluence on SEU sensitivity of static random access memories have been investigated. The memory imprint effect has been observed to yield ...varying results.
We present new single event effects testing results for the RTAX2000S field-programmable-gate-array. We tested sequential and combinational logic structures, input/output blocks, and embedded RAM ...with ions and protons.
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