The distribution of mercury in surface water and in sediment from Deûle River in Northern France was studied by application of conventional sampling methods and by diffusive gradients in thin films technique (DGT). Concentration of total dissolved mercury in surface water was 20.8 ± 0.8 ng l(-1). The particulate mercury concentration was 6.2 ± 0.6 µg g(-1). The particulate mercury was accumulated in sediment (9.9 ± 2.3 mg kg(-1)), and it was transformed by methylating bacteria to methylmercury, mainly in the first 2-cm layer of the sediment. Total dissolved concentration of mercury in sediment pore water obtained by application of centrifugation extraction was 17.6 ± 4.1 ng l(-1), and it was comparable with total dissolved pore water mercury concentration measured by DGT probe containing Duolite GT-73 resin gel (18.2 ± 4.3 ng l(-1)), taking the sediment heterogeneity and different principles of the applied methods into account. By application of two DGT probes with different resin gels specific for mercury, it was found that approximately 30% of total dissolved mercury in sediment pore water was present in labile forms easy available for biota. The resolution of mercury DGT depth profiles was 0.5 cm, which allows, unlike conventional techniques, to study the connection of the geochemical cycle of mercury with geochemical cycles of iron and manganese.
- MeSH
- chemické látky znečišťující vodu analýza MeSH
- monitorování životního prostředí metody MeSH
- rtuť analýza MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Francie MeSH
Tuberkulom mozku patří v České republice mezi raritní příčiny intrakraniálních expanzí. Jedná se častěji o mnohočetné ložiskové postižení mozku v rámci postprimární formy tuberkulózy. Definitivní diagnózu lze stanovit histopatologickým a/nebo bakteriologickým vyšetřením, pravděpodobnou diagnózu pak zlepšováním klinického stavu a regresí ložisek po nasazení kauzální léčby antituberkulotiky. Prognóza po zahájení terapie je poměrně příznivá, mortalita je udávána pouze 10 %. Autor prezentuje 56letou pacientku s histologicky verifikovaným tuberkulomem mozku a doporučuje vždy provést biopsii mozku i u starších pacientů s obrazem izolovaného či mnohočetného „metastatického“ postižení mozku s negativním nálezem primárního extracerebrálního tumoru při komplexním onkologickém vyšetření.
Tuberculoma of the brain is among rare causes of intracranial expansions in the Czech Republic. More frequently, there is multifocal brain disease as part of the postprimary form of tuberculosis. A definitive diagnosis can be made based on histopathological and/or bacteriological examination; a probable diagnosis can be made based on improvement in the clinical condition and focal regression after commencing causal therapy with antituberculosis drugs. Following treatment initiation, the prognosis is relatively favorable; the mortality rate is reported to be only 10%. The author presents a case of a 56-year-old female patient with a histologically proved tuberculoma of the brain and recommends to always perform brain biopsy even in older patients who present with isolated or multiple "metastatic" brain disease and with a negative finding of primary extracerebral tumor on comprehensive oncological evaluation.
- MeSH
- antituberkulotika terapeutické užití MeSH
- biopsie MeSH
- histologické techniky MeSH
- lidé středního věku MeSH
- lidé MeSH
- magnetická rezonanční spektroskopie MeSH
- magnetická rezonanční tomografie MeSH
- mozek patologie MeSH
- tuberkulom intrakraniální * diagnóza farmakoterapie patologie MeSH
- záchvaty MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- ženské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH
Concentrations of Cd, Cu, Cr, Pb, Ni and Zn were monitored in the Svitava River (the Czech Republic) during April and September 2005. Total concentrations and total dissolved concentrations were obtained through regular water sampling, and the diffusive gradients in thin films technique (DGT) were used to gain information on the kinetically labile metal concentrations. Each measured concentration was compared with the corresponding average (bio)available concentration calculated from the mass of metal accumulated by the moss species Fontinalis antipyretica. The concentrations of Cd, Pb, Cr and Zn measured using DGT corresponded well with those obtained after the deployment of Fontinalis antipyretica moss bags in the Svitava River, but the concentrations of Cu and Ni did not. The calculated (bio)available Cu concentration correlated well with the total dissolved concentration of Cu, whereas no correlation was found to exist between the concentrations of Ni.
