Search results for "Cadmium"

Effect of cadmium exposure on zinc levels in the brine shrimp Artemia parthenogenetica

1999

Zinc and cadmium have been reported as metabolic antagonists, such that high zinc intake afford animals some protection against the potentially toxic effects of cadmium exposure. There is considerable evidence to support a role of metallothioneins (MTs) in regulating or controlling the intracellular availability of essential metals and the non-essential metal. The effect of 24-h cadmium pre-exposure (10 mg Cd/l) on zinc concentrations in the brine shrimp Artemia parthenogenetica exposed to zinc (5 mg Zn/l) was studied. The zinc content of shrimps was not altered by cadmium. The homeostatic mechanism for zinc regulation appears not to be disturbed by cadmium exposure in shrimps kept in natur…

Evaluation of Antimony, Cadmium and Lead Levels in Vegetables, Drinking and Raw Water from Different Agricultural Areas

1990

Abstract Lead and cadmium levels in edible vegetables and antimony, lead and cadmium in drinking and raw waters from three agricultural areas exposed to different levels of environmental pollution (1-high industrial pollution, 2-high urban pollution, 3-standard low industrial and urban pollution) are determined. The organic matter is destroyed by repeated attack with nitric acid. Cadmium and lead are determined by graphite furnace atomic absorption spectrometry (GFAAS) and antimony by hydride generation atomic absorption spectrometry (HGAAS). When the results obtained for three different areas are compared, differences between cadmium and lead contents in vegetables are observed. Waters are…

Quantification of cadmium-induced metallothionein in crustaceans by the silver-saturation method

1995

Metallothionein (MT) has been proposed as a specific biochemical probe for metal exposure of aquatic organisms. It is recognized that its usefulness as a monitoring tool depends on the full understanding of its function and on the possibility of measuring its concentration in tissues. Therefore the study of MT in crustaceans is interesting from two different points of view: the need to understand mechanisms associated with the toxicology of metals, and the potential use of this protein for monitoring metal-contamined environments. Several methods have been developed for quantitative measurements of MT in biological samples. Immunochemical and electrochemical procedures are reliable techniqu…

The CdCl2 effects on synthetic DNAs encaged in the nanodomains of a cationic water-in-oil microemulsion

2011

The present work is dedicated to the study of the interactions of CdCl(2) with the synthetic polynucleotides polyAT and polyGC confined in the nanoscopic aqueous compartment of the water-in-oil microemulsion CTAB/pentanol/hexane/water, with the goal to mimic in vitro the situation met by the nucleic acids in vivo. In biological structures, in fact, very long strings of nucleic acids are segregated into very small compartments having a radius exceedingly smaller than the length of the encapsulated macromolecule. For comparison, the behaviour of polyGC was also studied in aqueous solutions of matched composition. The conformational and thermal stabilities of both polynucleotides enclosed in t…

Oddziaływanie kadmu i kwasu salicylowego na aktywność metaboliczną Lepidium sativum L.

2016

Kadm (Cd) jest metalem ciężkim, który w wyniku działań człowieka stał się głównym zanieczyszczeniem środowiska. Charakteryzuje się wysoką toksycznością dla wszystkich organizmów żywych. Symptomem toksyczności kadmu dla roślin są przede wszystkim zmiany morfologiczne, ograniczenie procesów fotosyntezy oraz stres oksydacyjny. Efekt zwiększenia odporności na stres można uzyskać, stosując różne związki egzogenne. Do takich związków należy między innymi kwas salicylowy (SA). Celem niniejszej pracy jest ocena wpływu kwasu salicylowego na stres metaboliczny u pieprzycy siewnej Lepidium sativum wywołany wzrastającymi stężeniami kadmu. W liściach pieprzycy siewnej oznaczano ilości białka, chlorofilu…

Metals in sediments of lakes in Latvia

1995

Abstract The concentrations and speciation forms of Pb, Cu, Ni, Cd, Zn, and Mn have been determined in sediments from 49 lakes thoroughout Latvia to study the impact of different pollutant sources and to estimate the background pollution level. Regional variation in pollutant distributions of Pb, Cu, and Cd concentrations is due to anthropogenic load. The enrichment of metals in the top layer of sediments is an estimate of the environmental pollution level. In regions with no known pollution sources, this enrichment was not typical. Another factor that determines metal concentrations in sediments is the organic matter production and sedimentation in eutrophic water bodies.

Theoretical study of supernova neutrino and antineutrino scattering off the stable cadmium and lead isotopes

2017

In this thesis work, an extensive study of neutrino- and antineutrino-nucleus interactions is performed. The work is focused on supernova-neutrino scattering off the stable cadmium and lead isotopes. The studied nuclei are of interest for the investigations of neutrino-properties and for neutrino-detection experiments. The adopted nuclear-structure models are based on the quasiparticle random-phase approximation (QRPA) and the microscopic quasiparticle- phonon model (MQPM) and the cross-sections calculations are based on the Donnelly-Walecka formalism. The computed cross sections are folded with a two-parameter Fermi-Dirac distribution to obtain realistic estimates of the nuclear responses …

Effect of cadmium and manganese on gene expression and “in vitro” proliferative and invasive behaviour of MDA-MB231 human breast cancer cells

2009

Micro-X-Ray Fluorescence and the Old Masters Non-destructive in situ characterisation of the varnish of historical Low Countries stringed musical ins…

2012

Applied Physics A, 107

0329 Occupational exposure to metals and welding fumes, and risk of glioma in the interocc study

2017

Background Brain tumouraetiology is poorly understood. Based on their ability to pass through the blood-brain barrier, it has been hypothesised that exposure to metals may increase the risk of brain cancer. Results from the few epidemiological studies on this issue are inconsistent. Methods We investigated the relationship between glioma risk and occupational exposure to five metals - lead, cadmium, nickel, chromium and iron- as well as to welding fumes, using data from the seven-country INTEROCC study. A total of 1800 incident glioma cases and 5160 controls aged 30–69 years were included in the analysis. Lifetime occupational exposure to the agents was assessed using the INTEROCC JEM, a mo…