Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 2.887
Filtrar
1.
Mar Pollut Bull ; 150: 110597, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31910513

RESUMO

Human pressure leaves a mark on coastal ecosystems that can be used to study the ecology of marine species. This study compared the trace elements (TEs) composition and isotopic niche metrics of the squid Loligo vulgaris, the cuttlefish Sepia officinalis and the octopus Octopus vulgaris in the western Mediterranean Sea. The results revealed that anthropogenic pressure clearly affected coastal waters and the habitat use of these three cephalopods. Anthropogenic pressure in coastal areas, measured by the LUSI index, correlated with the TEs composition of cephalopods. The DistLM analysis showed that Cr and Zn were strong predictor variables of the LUSI matrix on all three cephalopod species. In this study, isotopic niche, combined with the CAP analysis of TEs, were plotted in a bivariate manner, which could refer to an "anthropo-niche". We provide a useful heuristic scheme for analyzing the interplay among coastal influence, trophic level, and the TEs from environment.


Assuntos
Cefalópodes/fisiologia , Ecossistema , Oligoelementos/metabolismo , Animais , Decapodiformes , Humanos , Mar Mediterrâneo , Octopodiformes
2.
Environ Pollut ; 256: 113389, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31685327

RESUMO

The boreoatlantic gonate squid (Gonatus fabricii) represents important prey for top predators-such as marine mammals, seabirds and fish-and is also an efficient predator of crustaceans and fish. Gonatus fabricii is the most abundant cephalopod in the northern Atlantic and Arctic Ocean but the trace element accumulation of this ecologically important species is unknown. In this study, trace element concentrations (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, and Zn) were analysed from the mantle muscle and the digestive gland tissue of juveniles, adult females, and adult males that were captured south of Disko Island off West-Greenland. To assess the feeding habitat and trophic position of this species, stable isotopes of carbon (δ13C) and nitrogen (δ15N) were measured in their muscle tissue. Mercury concentrations were positively correlated with size (mantle length) and trophic position. The Hg/Se ratio was assessed because Se has been suggested to play a protective role against Hg toxicity and showed a molar surplus of Se relative to Hg. Cadmium concentrations in the digestive gland were negatively correlated with size and trophic position (δ15N), which suggested a dietary shift from Cd-rich crustaceans towards Cd-poor fish during ontogeny. This study provides trace element concentration data for G. fabricii from Greenlandic waters, which represents baseline data for a northern cephalopod species. Within West-Greenland waters, G. fabricii appears to be an important vector for the transfer of Cd in the Arctic pelagic food web.


Assuntos
Bioacumulação , Decapodiformes/metabolismo , Monitoramento Ambiental/métodos , Metais Pesados/análise , Oligoelementos/análise , Poluentes Químicos da Água/análise , Animais , Regiões Árticas , Oceano Atlântico , Clima Frio , Ecossistema , Feminino , Cadeia Alimentar , Masculino , Metais Pesados/metabolismo , Alimentos Marinhos/análise , Oligoelementos/metabolismo , Poluentes Químicos da Água/metabolismo
3.
Sci Total Environ ; 699: 134410, 2020 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-31678876

RESUMO

In Europe, monitoring contaminant concentrations and their effects in the marine environment is required under the Marine Strategy Framework Directive (MSFD, 2008/56/EC). The striped dolphin (Stenella coeruleoalba) is the most abundant small cetacean species in Portuguese oceanic waters, representing a potential biomonitoring tool of contaminant levels in offshore waters. Concentrations of nine trace elements were evaluated by ICP-MS in kidney, liver and muscle samples of 31 striped dolphins stranded in the Portuguese continental coast. The mean renal Cd concentration was high (19.3 µg.g-1 wet weight, range 0.1-69.3 µg.g-1 wet weight) comparing to striped dolphins from other locations. Therefore, the present study reports a possibly concerning level of Cd in the oceanic food chain in Portuguese offshore areas. This study also aimed at evaluating potential relationships between trace element concentrations and striped dolphins' biological and health-related variables. Individual length was related with some of the trace element concentrations detected in striped dolphins. Indeed, Cd, Hg and Se bioaccumulated in larger animals, whereas the reverse was observed for Mn and Zn. Striped dolphins with high parasite burdens showed higher levels of Hg, while animals showing gross pathologies presented higher concentrations of Cd and Se. This study reported relationships between trace element concentrations and health-related variables for the first time in striped dolphins and it also provided information on the relative contamination status of Portuguese oceanic waters in comparison to other regions in the world.


Assuntos
/métodos , Stenella/metabolismo , Oligoelementos/metabolismo , Poluentes Químicos da Água/metabolismo , Animais
4.
J Sci Food Agric ; 100(2): 885-890, 2020 Jan 30.
Artigo em Inglês | MEDLINE | ID: mdl-31483055

RESUMO

BACKGROUND: The research focused on the evaluation of the impact of cover cropping on trace metals (Fe, Mn, Cu, Zn, Pb, Co and Cd) and nutrients in vineyard soils and Vitis vinifera L. For this purpose, two types of cover crops (Lolium perenne L. and Medicago sativa L.) and their mixture were planted between vine rows of Muscat white in the vineyard in South Crimea. Trace elements, nutrients and other parameters were analyzed in the soil layers, leaves and grapevines of control and cover cropped plots. RESULTS: The effect of cover cropping was dependent on applied plant species. Ryegrass (L. perenne L.) seems to compete with V. vinifera L. for nutrients - these were lower in the soil and vines of the treated plot. In parallel, lead (Pb) bioconcentration in grapevines was reduced. In contrast, under lucerne (M. sativa L.), nitrogen in the soil and vines, and trace metal bioconcentration (Fe, Pb and Co) were higher. CONCLUSIONS: Our results indicate that cover cropping can influence the chemical composition of soil and vines. This should be considered when selecting cover crops. © 2019 Society of Chemical Industry.


Assuntos
Produção Agrícola/métodos , Lolium/crescimento & desenvolvimento , Medicago/crescimento & desenvolvimento , Oligoelementos/análise , Vitis/química , Frutas/química , Frutas/crescimento & desenvolvimento , Frutas/metabolismo , Lolium/metabolismo , Medicago/metabolismo , Nutrientes/análise , Nutrientes/metabolismo , Solo/química , Especificidade da Espécie , Oligoelementos/metabolismo , Vitis/crescimento & desenvolvimento , Vitis/metabolismo
5.
Environ Monit Assess ; 192(1): 38, 2019 Dec 12.
Artigo em Inglês | MEDLINE | ID: mdl-31828435

RESUMO

Algae are a group of autotropic and eukaryotic organisms that play a significant role in the food, pharmaceutical, cosmetic, fuel, and textile industries. They are an important part of our ecosystem, and they can help control the growing problem of pollution. In this work, the carotenoid, sterol, polyphenol and mineral content, spectral and thermal characteristics of six common river algae, viz. Chara spp., Hydrodictyon spp., Lyngbya spp., Nitella spp., Pithophora spp., and Spirogyra spp., collected from Kharun river (India), were evaluated. The concentration of oil, total polyphenols, flavonoids, and mineral ranged from 0.4 to 4.3%, from 2705 to 4450 mg/kg, from 1590 to 2970 mg/kg, and from 85,466 to 122,871 mg/kg of algae (dw), respectively. The concentration of carotenoids and sterols varied from 1.6 to 109 mg/kg and from 522 to 35,664 mg/kg. The potentiality towards the bioaccumulation of 22 trace elements from the surface reservoir was assessed and discussed in relation to carbonate inlay of the algae wall and to the ions ability to bind to pectin, polypeptides, carotenoids, polyphenols, and flavonoids, on the basis of infrared spectroscopy data. In view of the extremely high enrichment factors found for certain elements, such as P, Co, Cu, Pb, and Fe, some of these algae hold promise as bioindicators for the detection of these elements in aquatic environments. Ordination analysis was used to measure the variance gradient of the algal data.


Assuntos
Clorófitas/metabolismo , Monitoramento Ambiental , Oligoelementos/metabolismo , Poluentes Químicos da Água/metabolismo , Bioacumulação , Ecossistema , Índia , Rios/química , Oligoelementos/análise , Poluentes Químicos da Água/análise , Poluição da Água/análise
6.
Ideggyogy Sz ; 72(11-12): 367-379, 2019 Nov 30.
Artigo em Húngaro | MEDLINE | ID: mdl-31834680

RESUMO

Trace elements are found in the living organism in small (trace) amounts and are mainly essential for living functions. Essential trace elements are in humans the chromium (Cr), cobalt (Co), copper (Cu), fluorine (F), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), zinc (Zn), and questionably the boron (B) and vanadium (V). According to the biopsychosocial concept, mental functions have biological underpinnings, therefore the impairment of certain neurochemical processes due to shortage of trace elements may have mental consequences. Scientific investigations indicate the putative role of trace element deficiency in psychiatric disorders such in depression (Zn, Cr, Se, Fe, Co, I), premenstrual dysphoria (Cr), schizophrenia (Zn, Se), cognitive deterioration/de-mentia (B, Zn, Fe, Mn, Co, V), mental retardation (I, Mo, Cu), binge-eating (Cr), autism (Zn, Mn, Cu, Co) and attention deficit hyperactivity disorder (Fe). At the same time, the excess quantity (chronic exposure, genetic error) of certain trace elements (Cu, Mn, Co, Cr, Fe, V) can also lead to mental disturbances (depression, anxiety, psychosis, cognitive dysfunction, insomnia). Lithium (Li), being efficacious in the treatment of bipolar mood disorder, is not declared officially as a trace element. Due to nutrition (drinking water, food) the serum Li level is about a thousand times less than that used in therapy. However, Li level in the red cells is lower as the membrane sodium-Li countertransport results in a Li efflux. Nevertheless, the possibility that Li is a trace element has emerged as studies indicate its potential efficacy in such a low concentration, since certain geographic regions show an inverse correlation between the Li level of drinking water and the suicide rate in that area.


Assuntos
Transtornos Cognitivos/metabolismo , Oligoelementos/metabolismo , Transtornos Cognitivos/fisiopatologia , Humanos , Ferro
7.
Environ Sci Pollut Res Int ; 26(36): 36343-36353, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31713821

RESUMO

Arsenic (As) and copper (Cu) are ubiquitous pollutants that pose a threat to the environment. Our aim is to study the underlying mechanisms by which As and Cu act on the chicken gizzard. In order to detect ionic disorders in chicken gizzard under chronic treatment with As3+ and/or Cu2+ and whether they can induce oxidative damage as well as immune disorders, 30 mg/kg arsenic trioxide (As2O3) and/or 300 mg/kg copper sulfate (CuSO4) were added to the chicken's basal diet. After 12 weeks of exposure, trace elements were found to have significant interference, accompanied by damage to the antioxidant system. In addition, As3+ and/or Cu2+ activated the nuclear factor kappa B (NF-κB), inducing severe inflammation. At the same time, damaged structural integrity which might be caused by inflammation was discovered after hematoxylin and eosin (H&E) staining. Moreover, symbolic Th1/Th2 (Th, helper T cell) drift was also observed in treatment groups, meaning that immune function is left to be affected, and the increment in heat shock proteins may be a self-protective mechanism of gizzard. Interestingly, we found that the damage to the gizzard of chicken was aggravated in a time-dependent manner, and the combined exposure was more pathogenic than the single exposure, of which the mechanism needs further exploration. Together, this work helps move us toward a better understanding of the molecular mechanisms that mediate the interactions between Cu excess and As3+ exposures and possible health consequences in susceptible species.


Assuntos
Trióxido de Arsênio/toxicidade , Galinhas , Sulfato de Cobre/toxicidade , Poluentes Ambientais/toxicidade , Moela das Aves/efeitos dos fármacos , Proteínas de Choque Térmico/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Animais , Antioxidantes/metabolismo , Galinhas/imunologia , Galinhas/metabolismo , Moela das Aves/imunologia , Moela das Aves/metabolismo , Inflamação/metabolismo , Oligoelementos/metabolismo
8.
J Dairy Sci ; 102(12): 11180-11192, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31587908

RESUMO

Enhancing micronutrient (i.e., mineral and vitamin) concentrations within milk and serum from dairy cows is important for both the health of the cow and the nutritive value of the milk for human consumption. However, a good understanding of the genetics underlying the micronutrient content in dairy cattle is needed to facilitate such enhancements through feeding or breeding practices. In this study, milk (n = 950) and serum (n = 766) samples were collected from Holstein-Friesian dairy cows (n = 479) on 19 occasions over a 59-mo period and analyzed for concentrations of important elements. Additionally, a subset of 256 milk samples was analyzed for concentrations of vitamin B12. Cows belonged to 2 genetic lines (average and highest genetic merit for milk fat plus protein yield) and were assigned to 1 of 2 diets based on either a by-product or homegrown ration. Univariate models accounting for repeated records were used to analyze element and vitamin B12 data and investigate the effect of genotype and feeding system as well as derive estimates of variance components and genetic parameters. Bivariate models were used to study correlations both within and between milk and serum. Only concentrations of Hg in milk were seen to be affected by genotype, with higher concentrations in cows with high genetic merit. In contrast, element concentrations were influenced by feeding system such that cows fed the homegrown diet had increased milk concentrations of Ca, Cu, I, Mn, Mo, P, and K and increased serum concentrations of Cd, Cu, Fe, Mo, and V. Cows on the by-product diet had increased milk concentrations of Mg, Se, and Na and increased serum concentrations of P and Se. Heritability (h2) estimates were obtained for 6 milk and 4 serum elements, including Mg (h2milk = 0.30), K (h2serum = 0.18), Ca (h2milk = 0.20; h2serum = 0.12), Mn (h2milk = 0.14), Cu (h2serum = 0.22), Zn (h2milk = 0.24), Se (h2milk = 0.15; h2serum = 0.10), and Mo (h2milk = 0.19). Significant estimates of repeatability were observed in all milk and serum quantity elements (Na, Mg, P, K, and Ca) as well as 5 milk and 7 serum trace elements. Only K in milk and serum was found to have a significant positive genetic and phenotypic correlation (0.52 and 0.22, respectively). Significant phenotypic associations were noted between milk and serum Ca (0.17), Mo (0.19), and Na (-0.79). Additional multivariate analyses between measures within sample type (i.e., milk or serum) revealed significant positive associations, both phenotypic and genetic, between some of the elements. In milk, Se was genetically correlated with Ca (0.63), Mg (0.59), Mn (0.40), P (0.53), and Zn (0.52), whereas in serum, V showed strong genetic associations with Cd (0.71), Ca (0.53), Mn (0.63), Mo (0.57), P (0.42), K (0.45), and Hg (-0.44). These results provide evidence that element concentrations in milk and blood of dairy cows are significantly influenced by both diet and genetics and demonstrate the potential for genetic selection and dietary manipulation to alter nutrient concentration to improve both cow health and the healthfulness of milk for human consumption.


Assuntos
Bovinos/genética , Leite/química , Animais , Cruzamento , Bovinos/sangue , Dieta/veterinária , Feminino , Testes Genéticos/veterinária , Lactação , Proteínas do Leite/análise , Minerais/análise , Valor Nutritivo , Oligoelementos/metabolismo , Vitamina B 12/análise
9.
Mar Pollut Bull ; 145: 56-66, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31590824

RESUMO

The concentration of nine trace elements were analyzed in the different tissue organs of commonly available crabs (Portunus sanguinolentus, Portunus pelagicus and Scylla serrate) and bivalve (Polymesoda erosa) species collected from the Miri coast, Borneo in order to evaluate the potential health risk by consumption of these aquatic organisms. Among the analyzed organs, metal accumulation was higher in the gill tissues. The essential (Cu and Zn) and non-essential (Pb and Cd) elements showed the highest (i.e. Zn) and lowest concentrations (i.e. Cd) in their tissue organs, respectively. The estimated daily intake and hazard indices of all metals in the muscle indicate that the measured values were below the provisional tolerable daily intake suggested by the joint FAO/WHO Expert Committee on Food Additives. Compared to Malaysian and international seafood guideline values the results obtained from the present study are lower than the permissible limits and safe for consumption.


Assuntos
Bivalves/metabolismo , Braquiúros/metabolismo , Metais Pesados/metabolismo , Frutos do Mar/análise , Oligoelementos/metabolismo , Animais , Bornéu , Malásia , Medição de Risco , Poluentes Químicos da Água/metabolismo
10.
Diabetes Res Clin Pract ; 157: 107871, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31604082

RESUMO

AIM: An analysis is made of the saliva and plasma levels of trace elements in patients with type 2 diabetes mellitus and their association to metabolic control and the presence of chronic complications. METHODS: A cross-sectional observational clinical study was carried out in 74 patients with type 2 diabetes mellitus. Mass spectrometry (ICP-MS) was used to determine the following trace elements in plasma and unstimulated basal saliva: 13Al, 16S, 4Be, 5B, 20Ca, 27Co, 29Cu, 24Cr, 38Sr, 15P, 3Li, 12Mg, 25Mn, 28Ni, 82Pb, 37Rb, 22Ti, 23V and 30Zn. RESULTS: The levels of cobalt (p = 0.048) in saliva and of strontium (p = 0.001) in plasma were related to the presence of chronic complications. Significant differences with respect to metabolic control were observed for beryllium (p = 0.038), boron (p = 0.023) and phosphorus in saliva (p = 0.046), and for rubidium (p = 0.005), titanium (p = 0.016) and zinc in plasma (p = 0.013). A significant correlation (p < 0.001) was found between boron in plasma and boron in unstimulated basal saliva. CONCLUSIONS: The determination of trace elements in plasma and saliva constitutes a complementary tool for the assessment of metabolic control and for predicting chronic complications associated to type 2 diabetes mellitus. Further studies involving the biomonitoring of trace elements in saliva and plasma are needed.


Assuntos
Diabetes Mellitus Tipo 2/metabolismo , Plasma/química , Saliva/química , Oligoelementos/metabolismo , Adulto , Idoso , Estudos Transversais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
11.
Elife ; 82019 09 18.
Artigo em Inglês | MEDLINE | ID: mdl-31532389

RESUMO

Iron is essential for survival of most organisms. All organisms have thus developed mechanisms to sense, acquire and sequester iron. In C. elegans, iron uptake and sequestration are regulated by HIF-1. We previously showed that hif-1 mutants are developmentally delayed when grown under iron limitation. Here we identify nhr-14, encoding a nuclear receptor, in a screen conducted for mutations that rescue the developmental delay of hif-1 mutants under iron limitation. nhr-14 loss upregulates the intestinal metal transporter SMF-3 to increase iron uptake in hif-1 mutants. nhr-14 mutants display increased expression of innate immune genes and DAF-16/FoxO-Class II genes, and enhanced resistance to Pseudomonas aeruginosa. These responses are dependent on the transcription factor PQM-1, which localizes to intestinal cell nuclei in nhr-14 mutants. Our data reveal how C. elegans utilizes nuclear receptors to regulate innate immunity and iron availability, and show iron sequestration as a component of the innate immune response.


Assuntos
Proteínas de Caenorhabditis elegans/metabolismo , Caenorhabditis elegans/imunologia , Caenorhabditis elegans/metabolismo , Imunidade Inata , Ferro/metabolismo , Pseudomonas aeruginosa/imunologia , Transdução de Sinais , Transativadores/metabolismo , Animais , Transporte Biológico , Resistência à Doença , Infecções por Pseudomonas/imunologia , Oligoelementos/metabolismo
12.
J Genet ; 982019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31544773

RESUMO

This study aims to analyse the potential relationship between single-nucleotide polymorphism (SNPs) in trace element related metabolic genes GSTM3, GSTP1, GPX1 and NKG2D and the risk of gastric cancer. A case-control study was conducted in the hospital of Xianyou, Fujian, China. In this study, a total of 299 patients with histopathological diagnosis in gastric cancer and 295 healthy control subjects were involved. Association between the SNPs in trace element-related metabolic genes and gastric cancer risk was analysed using the unconditional logistic regression model. No relationship was found between the SNPs of GSTM3 and GPX1 genes and gastric cancer risk. However, the risk of gastric cancer is related to the SNPs of NKG2D gene (rs1049174). Patients who carry the rs1049174 GG genotype have a higher incidence of the gastric cancer and a multivariate odds ratio (OR) of 1.85 (95% confidence intervals (CI): 1.02-3.38). Through haplotype analysis, two haplotypes (i.e. A_rs1746123-T_rs10431294-G_rs1049174 and T_rs1746123-T_rs10431294-C_rs1049174), OR of 0.29 (95% CI: 0.15-0.56) and 0.33, (95% CI: 0.22-0.50), respectively, were found to have lower incidence of gastric cancer. Meanwhile, another two haplotypes (T_rs1746123-C_rs10431294-C_rs1049174 and T_rs1746123-T_rs10431294-G_rs1049174), OR of 1.81 (95% CI: 1.40-2.34) and 3.09 (95% CI: 2.30-4.16), respectively, were found to have a higher incidence of gastric cancer. Further, no influence of the haplotype on the risk of cardia gastric cancer was found. However, the haplotype T_rs1746123-T_rs10431294-C_rs1049174 had lower incidence of noncardia gastric cancer by 46%. Our data showed that polymorphisms of trace element-related metabolic genes are important in gastric cancer pathology.


Assuntos
Neoplasias Gástricas/genética , Oligoelementos/metabolismo , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos de Casos e Controles , China/epidemiologia , Feminino , Estudos de Associação Genética , Predisposição Genética para Doença/epidemiologia , Glutationa Peroxidase/sangue , Glutationa Peroxidase/genética , Glutationa S-Transferase pi/sangue , Glutationa S-Transferase pi/genética , Glutationa Transferase/sangue , Glutationa Transferase/genética , Haplótipos , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Subfamília K de Receptores Semelhantes a Lectina de Células NK/sangue , Subfamília K de Receptores Semelhantes a Lectina de Células NK/genética , Polimorfismo de Nucleotídeo Único , Fatores de Risco , Neoplasias Gástricas/sangue
13.
Bull Environ Contam Toxicol ; 103(5): 750-755, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31555848

RESUMO

With increasing urbanization and industrialization, clean air is becoming a scarce resource. During the present investigation, concentrations of metals (Pb, Ni and Zn) in the atmosphere and their subsequent deposition in the lungs of two common avian species, common myna, Acridotheres tristis (n = 30) and bank myna, A. ginginianus (n = 20), captured from urban areas of Lahore city and semi-urban areas of Pattoki city 80 km away from main city of Lahore were determined. The obtained results were analyzed statistically using Independent sample t test and Pearson's correlation. A comparison of trace metal concentrations in air of both the cities was also carried out. Statistically, significant variations were recorded for Pb (t (7) = - 4.276, p = 0.001) while non-significant differences were observed for both Ni (t (7) = 0.049, p = 0.962) and Zn (t (7) = 1.555, p = 0.146).


Assuntos
Poluentes Atmosféricos/metabolismo , Aves/metabolismo , Monitoramento Ambiental/métodos , Pulmão/metabolismo , Metais Pesados/metabolismo , Oligoelementos/metabolismo , Animais , Bioacumulação , Cidades , Paquistão , Urbanização
14.
Nutrients ; 11(9)2019 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-31484386

RESUMO

During recent years, we have witnessed a growing appreciation of several micronutrients in the immune response, including vitamins and minerals [...].


Assuntos
Homeostase/fisiologia , Inflamação/metabolismo , Oligoelementos/farmacologia , Zinco/farmacologia , Humanos , Oligoelementos/metabolismo , Zinco/metabolismo
15.
Environ Monit Assess ; 191(9): 540, 2019 Aug 05.
Artigo em Inglês | MEDLINE | ID: mdl-31378832

RESUMO

In this work, we present the results of the investigation of trace elements (Fe, Mg, Ni, Zn, Cu, Cr, Co, Cd, Pb) accumulation potential of Noccaea kovatsii (Heuff.) F. K. Mey., from the Balkan Peninsula. The study included eight populations from ultramafic soils, six from Bosnia and Herzegovina, and two from Serbia. Principal component analysis (PCA) was used to reveal relationships of elements in soil, and Pearson's correlation coefficients for analysing associations of available quantities of elements in soil and those in roots and shoots of N. kovatsii. Uptake and translocation efficiency was assessed by using bioconcentration (BCF) and translocation factors (TF). All the analysed populations of N. kovatsii emerged as strong Ni accumulators, with the highest shoot concentrations of 12,505 mg kg-1. Even thought contents of Zn in plant tissues of N. kovatsii were under the hyperaccumulation level (602 mg kg-1 and 1120 mg kg-1 respectively), BCF was up to 667, indicating that certain surveyed populations have strong accumulative potential for this element.


Assuntos
Brassicaceae/metabolismo , Poluentes do Solo/análise , Solo/química , Oligoelementos/análise , Bósnia e Herzegóvina , Brassicaceae/química , Monitoramento Ambiental , Raízes de Plantas/química , Raízes de Plantas/metabolismo , Brotos de Planta/química , Brotos de Planta/metabolismo , Análise de Componente Principal , Sérvia , Poluentes do Solo/metabolismo , Oligoelementos/metabolismo
16.
Sci Total Environ ; 693: 133404, 2019 Nov 25.
Artigo em Inglês | MEDLINE | ID: mdl-31377372

RESUMO

Major and trace element deposition across western Washington, USA was assessed in 2016 and 2017 by analyzing tissue metal concentrations in the epiphytic mosses Isothecium stoloniferum (Bridel) and Kindbergia praelonga (Hedw.) Ochyra. We used an intensive, vertically stratified sampling approach in Acer macrophyllum canopies in the Hoh Rainforest on the Olympic Peninsula, WA and in Seattle, WA to collect 214 samples of I. stoloniferum. An extensive, ground-based sampling approach was used across an urban-to-wildland gradient to collect 59 K. praelonga samples. Intensive samples were collected four times (April, July, and October of 2016 and in January 2017) and extensive samples three times (April, July, and October 2016) to assess seasonal differences in metal concentrations across sampling locations. A total of 273 moss samples were analyzed for Cd, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb, Sr, Ti, and Zn concentrations. Elevated concentrations of these elements were found in moss samples from both intensive and extensive sampling efforts across all seasons. Sampling location for both intensive and extensive sampling efforts was found to be a significant factor in determining moss metal concentrations. Metal deposition in and around Seattle appears to be derived from the regional transportation sector and other industrial sources. Ten I. stoloniferum samples from Seattle and the Hoh Rainforest were analyzed for Pb and Sr isotope ratios to help differentiate between natural and industrial-based emission sources. Hoh Rainforest Pb isotopes appear to be explained by a mixture of long-range Asian Pb influences and natural Pb sources, whereas Seattle Pb isotopes appear driven by industrial and road dust sources.


Assuntos
Poluentes Atmosféricos/metabolismo , Bryopsida/química , Monitoramento Ambiental , Metais Pesados/metabolismo , Oligoelementos/metabolismo , Estações do Ano , Washington
17.
Mar Pollut Bull ; 146: 1013-1030, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31430843

RESUMO

Trace metal contamination in the European sardine and anchovy food web was investigated in the Gulf of Lions, NW Mediterranean Sea, including seawater and size fractions of plankton. The results highlighted: i) higher and more variable concentrations in the smaller plankton size classes for all metals except cadmium; ii) higher concentrations in anchovy versus sardine for all elements except lead; iii) different patterns of metal bioaccumulation through the food web: cobalt, nickel, copper, silver, lead and zinc displayed continuously decreasing concentrations (with the exception of increased zinc in fish only), while mercury concentrations dropped considerably in larger plankton size classes and rose significantly in fish. Lastly, cadmium concentrations were found to be highest in intermediate plankton size classes, with very low levels in fish. The need to efficiently characterize the biological composition of plankton in order to fully identify its role in the mobilization and transfer of metals was highlighted.


Assuntos
Peixes/metabolismo , Cadeia Alimentar , Metais/metabolismo , Plâncton/metabolismo , Oligoelementos/metabolismo , Poluentes Químicos da Água/metabolismo , Animais , Mar Mediterrâneo , Alimentos Marinhos/análise , Água do Mar/química , Especificidade da Espécie
18.
Environ Sci Pollut Res Int ; 26(29): 30242-30251, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31422538

RESUMO

Salvinia natans meets many criteria for accumulative bioindicators and phytoremediation agents. However, the majority of studies on its bioaccumulation capacity were performed under controlled culture conditions. In the present study, Salvinia natans was investigated in a field study. Plant and water samples were collected from aquatic reservoirs located in areas with various dominant land uses (forested, agricultural, residential and industrial). Contents of 10 trace elements (As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn) and phytomass were measured to estimate the bioindication and phytoremediation potential of the species. Results showed that contents of trace elements in S. natans were high compared with other aquatic ferns (Azolla japonica, A. pinata) as well as free-floating vascular plants (e.g. Pistia stratiotes, Hydrocharis morsus-ranae, Lemna sp., Eichhornia crassipes). High bioaccumulation factors for Cu, Fe, Mn, Ni, Pb and Zn confirm accumulative abilities of the plant. Application of neural networks (SOFMs) confirmed that the species may be used in bioindication: the land use type determined the composition of substances carried into water reservoirs with runoff and trace elements accumulated in Salvinia tissues. Ferns in industrial areas had the highest content of Cd, Cu and Zn, while in residential areas plants showed the highest content of As, Co, Fe, Mn, Ni and Pb. Element contents in S. natans in forested areas were the lowest. High standing stocks of Cd, Mn and Ni indicated an important role of S. natans in the cycling of elements and potential use in their removal from aquatic ecosystems.


Assuntos
Metais Pesados/metabolismo , Oligoelementos/metabolismo , Traqueófitas/metabolismo , Poluentes Químicos da Água/metabolismo , Agricultura , Biodegradação Ambiental , Ecossistema , Florestas , Indústrias , Metais Pesados/análise , Modelos Teóricos , Oligoelementos/análise , Poluentes Químicos da Água/análise
19.
Environ Pollut ; 254(Pt B): 113034, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31465904

RESUMO

Bats are particularly suited as bioindicators of trace element pollution due to their longevity and their position in the trophic chain. In this study, the concentrations of ten non-essential trace elements (Al, As, Ba, Cd, Hg, Pb, Sb, Sr, Th, Tl) were determined in the tissues (whole body, skin-fur, skinned body, liver, kidney and bone) of lactant Tadarida teniotis from a nursery colony in Rome. A large number of bats from this nursery died before fledging and had bone deformities and fractures. The concentrations of non-essential trace elements in bone and whole body were also analysed in adult specimens of Miniopterus schreibersii from a colony located in a natural park in Northern Italy. In lactant T. teniotis, the Pb concentration decreased in the following order: bone>liver>skinned body>whole body>skin-fur>kidney, and exceeded the toxic threshold associated with negative effects reported for different mammalian species. The levels of the other non-essential trace elements were within a range indicative of low environmental contamination in both species. Significant interspecies differences (P < 0.05) were observed for concentrations of Pb and Ba, higher in the bones of T. teniotis, and of Cd, Hg and Sr, higher in the bones of M. schreibersii. In lactant T. teniotis, the different sources of Pb exposure, through inhalation and/or food, may represent a potential threat to the colony of this synanthropic European bat.


Assuntos
Quirópteros/metabolismo , Exposição Ambiental/análise , Oligoelementos/análise , Animais , Monitoramento Ambiental , Itália , Rim/química , Fígado/química , Mercúrio/análise , Roma , Oligoelementos/metabolismo , Urbanização
20.
Emerg Microbes Infect ; 8(1): 1254-1264, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31469035

RESUMO

Transition metals are nutrients essential for life. However, an excess of metals can be toxic to cells, and host-imposed metal toxicity is an important mechanism for controlling bacterial infection. Accordingly, bacteria have evolved metal efflux systems to maintain metal homeostasis. Here, we established that PmtA functions as a ferrous iron [Fe(II)] and cobalt [Co(II)] efflux pump in Streptococcus suis, an emerging zoonotic pathogen responsible for severe infections in both humans and pigs. pmtA expression is induced by Fe(II), Co(II), and nickel [Ni(II)], whereas PmtA protects S. suis against Fe(II) and ferric iron [Fe(III)]-induced bactericidal effect, as well as Co(II) and zinc [Zn(II)]-induced bacteriostatic effect. In the presence of elevated concentrations of Fe(II) and Co(II), ΔpmtA accumulates high levels of intracellular iron and cobalt, respectively. ΔpmtA is also more sensitive to streptonigrin, a Fe(II)-activated antibiotic. Furthermore, growth defects of ΔpmtA under Fe(II) or Co(II) excess conditions can be alleviated by manganese [Mn(II)] supplementation. Finally, PmtA plays a role in tolerance to H2O2-induced oxidative stress, yet is not involved in the virulence of S. suis in mice. Together, these data demonstrate that S. suis PmtA acts as a Fe(II) and Co(II) efflux pump, and contributes to oxidative stress resistance.


Assuntos
Proteínas de Bactérias/metabolismo , Cobalto/metabolismo , Ferro/metabolismo , Metiltransferases/metabolismo , Streptococcus suis/enzimologia , Proteínas de Bactérias/genética , Transporte Biológico Ativo , Deleção de Genes , Metiltransferases/genética , Streptococcus suis/genética , Streptococcus suis/metabolismo , Oligoelementos/metabolismo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA