Search

Presents a study which analyzed computer calculations of current-voltage characteristics, impedance and noise in space-charge-limited flow in SiC crystals composed of layered polytypes. Basic transport equations; Boundary conditions specified to find a unique solution of the second-order differential charge transport equations; Computer simulation results of direct current characteristics.

Reviews the properties of silicon carbide (SiC) in which polytypism is a salient feature. Properties of SiC; Information on the theory of space-charge-limited flow in the presence of traps; Information on the impedance measurement.

Reveals that the noise spectra of amorphous SiC in the presence of space-charge-limited flow (SCL) are attributed to trapping noise. Review of the theory of trapping noise in SCL flow; Discussion on the spectra in the ohmic regime.

Copyright of Tijdschrift voor Bedrijfs- En Verzekeringsgeneeskunde is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tijdschrift voor Bedrijfs- En Verzekeringsgeneeskunde is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tijdschrift voor Bedrijfs- En Verzekeringsgeneeskunde is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We systematically reviewed the literature on the accuracy of new technologies proposed for breast cancer screening. Four potential tests were identified (ultrasound, magnetic resonance imaging (MRI), full-field digital mammography (FFDM), and computer-aided detection (CAD)) for which primary studies met quality and applicability criteria and provided adequate data on test accuracy. These technologies have been assessed in cross-sectional studies of test accuracy where the new test is compared to mammography. Ultrasound, used as an adjunct to mammography in women with radiologically dense breasts, detects additional cancers and causes additional false positives. Magnetic resonance imaging may have a better sensitivity (but lower specificity) than mammography in selected high-risk women, but studies of this technology included small number of cancers. Computer-aided detection may enhance the sensitivity of mammography and warrants further evaluation in large prospective trials. One study of FFDM suggests that it may identify some cancers not identified on conventional mammography and may result in a lower recall rate. The evidence is currently insufficient to support the use of any of these new technologies in population screening, but would support further evaluation.British Journal of Cancer (2004) 90, 2118-2122. doi:10.1038/sj.bjc.6601836 www.bjcancer.com Published online 27 April 2004 [ABSTRACT FROM AUTHOR]

A study was conducted to investigate the existence of a 'specific' neurotoxic effect due to long-term exposure to organic solvents. A comparison was made regarding diagnoses, symptoms and other relevant medical data between persons receiving a disability pension on the basis of a neuropsychiatric disorder selected from an exposed (painters) and non-exposed (construction workers) trade organization. Information was collected from their medical files at the occupational health department. Concerning diagnoses and symptoms, no significant differences were found between exposed and non-exposed patients. No indications were found for the existence of a 'typical' complex of symptoms associated with exposure to organic solvents among painters in The Netherlands. The number of reported symptoms was not related to the duration of exposure, thus lending no support for a dose-effect relationship. If a neurotoxic effect does exist among Dutch painters, it is of a non-specific type and not clearly distinguishable from other mental disorders. [ABSTRACT FROM AUTHOR]

The article presents a case study of a 63-year-old man who was presented with a subacute onset of right upper quadrant abdominal pain, abnormal liver function, and fever. The patient shows no history of immunosuppression and displays splenomegaly with no evidence of lymphadenopathy. An ultrasound-guided fine needle aspiration was made to the patient. The article discusses Fasciola hepatica which responds poorly to treatment with praziquantel and albendazole.

Copyright of Tijdschrift voor Bedrijfs- En Verzekeringsgeneeskunde is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Background: H. pylori infection is common and its acquisition is mainly in young ages. It has been claimed that during early childhood intrafamilial contamination is more possible than from other sources outside home. Aim: The aim of the study was to investigate the H. pylori status within families of children with upper GI symptoms. Methods: 45 symptomatic children without previous eradication therapy aged 4-16 years (median 11yrs) were investigated by [sup 13]C-UBT as well as all their 125 family members (parents and siblings) living in the same house. Socioeconomic status and conditions of living were also investigated. Results: According to H. pylori status the index children were divided into group A: 20 (44%) who were H. pylori infected and group B: 25 (56%) who were negative for H. pylori infection. Forty four out of 57 (77%) relatives of group A were also infected, while H. pylori was found only in 19 out of 68 (28%) relatives of group B, (p=0.000). In group A 79% of fathers, 90% of mothers and 65% of siblings were found H. pylori positive, while in group B 29%, 44% and 5.2% respectively (p=0.001, p=0.01,p=0.001). There was not found any difference concerning living conditions between H. pylori positive and negative children. Conclusions: The significantly higher prevalence H. pylori infection within families of H. pylori positive symptomatic children, compared to the negative ones, supports the hypothesis that transmission of H. pylori in children could be from the infected members of the family or the same source within house. [ABSTRACT FROM AUTHOR]

Background: A high incidence of H. pylori among family members of children with H. pylori gastritis has previously been documented on biopsy material. The main objective of this study was the genetic clarification of H. pylori strains involved in intrafamilial dispersion. Materials and Methods: Formalin-fixed, paraffin-embedded material of antral mucosa from 32 members of 11 families was studied for the presence of genetic homogeneity. To achieve this goal, the entire genome of H. pylori was studied by the RAPD fingerprinting method. Furthermore, the Urease A gene was analyzed as internal control, using a multiplex PCR-assay and the novel mutation detection method based on the Hydrolink analysis. Genetic similarities of the whole genome of H. pylori as well as the size and structure of Urease A gene were observed among members of the same family. Results: Although mutations in Urease A gene were found in 22 out of 32 individuals, the RAPD fingerprinting confirmed that the same H. pylori strain was involved in the intrafamilial dispersion. Conclusions: The homology of the H. pylori genome in members of the same family strongly supports the hypothesis of transmission of H. pylori from person-to-person or from a common source. [ABSTRACT FROM AUTHOR]