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https://www.readbyqxmd.com/read/29047057/strategies-of-heavy-metal-uptake-by-three-armeria-species-growing-on-different-geological-substrates-in-serbia
#1
Gordana Tomović, Uroš Buzurović, Sanja Đurović, Dražen Vicić, Nevena Mihailović, Ksenija Jakovljević
This study surveyed three species of the genus Armeria Willd. from five ultramafic outcrops, two non-ultramafic (schist) soils, and one tailing heap of an abandoned iron-copper mine from Serbia. Similarities and differences among the three Armeria species growing on different geological substrates in the ability to control uptake and translocate nine metals were examined. Chemical characteristics of the soil and plant samples (concentrations of P2O5, K2O, Ca, Fe, Mn, Ni, Zn, Cu, Cr, Co, Cd, and Pb) are presented...
October 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29040823/urea-increased-nickel-and-copper-accumulation-in-the-leaves-of-egeria-densa-planch-casp-and-ceratophyllum-demersum-l-during-short-term-exposure
#2
Maria Maleva, Galina Borisova, Nadezhda Chukina, Adarsh Kumar
In the present study, two fresh water plant species Egeria densa (Planch.) Casp. and Ceratophyllum demersum L. were subjected to separate and combined action of urea (2mМ) and metals (Ni and Cu, 10μM) to investigate the phytoremediation potential of these two submerged macrophytes during short-term experiments (48h). Both submerged macrophytes demonstrated high accumulative potential for Ni and Cu (average bioconcentration factors were 2505 for Ni and 3778 for Cu). The urea (2 mM) was not significantly toxic for studied plant species...
October 14, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29039332/antibacterial-activity-of-different-plant-extracts-and-antibiotics-on-pathogenic-bacterial-isolates-from-wheat-field-water
#3
Nazish Mazhar Ali, Syed Abdullah Mazhar, Bushra Mazhar, Anum Imtiaz, Saiqa Andleeb
The present work was carried out to study bacterial pathogens isolated from wheat field water and also effect of some plant extracts on these bacterial pathogens. Five bacterial strains were isolated from wheat field water. Different morphological and biochemical tests were performed to identify and characterize bacterial pathogens. Among isolated strains two belonged to genus Staphylococcus sp., other two were Pseudomonas spp. and one strain belonged to genus Salmonella sp. Effect of various parameters such as temperature, pH, antibiotics and heavy metals of these pathogens were also studied...
July 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29032515/oxidative-stress-and-heavy-metals-in-plants
#4
Radka Fryzova, Miroslav Pohanka, Pavla Martinkova, Hana Cihlarova, Martin Brtnicky, Jan Hladky, Jindrich Kynicky
Oxidative stress is a pathological process related to not only animal kingdom but also plants. Regarding oxidative stress in plants, heavy metals are frequently discussed as causative stimuli with relevance to ecology. Because heavy metals have broad technological importance, they can easily contaminate the environment. Much of previous effort regarding the harmful impact of the heavy metals was given to their toxicology in the animals and humans. Their implication in plant pathogeneses is less known and remains underestimated...
October 15, 2017: Reviews of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29023967/copper-toxicity-and-date-palm-seedling-tolerance-monitoring-of-related-biomarkers
#5
Zayneb ChaÂBene, Imen Rekik Hakim, Agnieszka Rorat, Amine Elleuch, Hafedh Mejdoub, Franck Vandenbulcke
Date palm seeds were exposed to different copper solutions to examine plant stress responses. Low Cu concentrations (0.02 and 0.2 mM) caused an increase of seed germination, whereas, higher Cu amount (2 mM) significantly inhibited seeds germination, delayed hypocotyl elongation, increased seedling mortality and reduced germination index by more than 90 %. Metal-related toxicity symptoms appeared after 15 days of 2 mM Cu exposure. Biochemical activities, like amylase activity and redox balance elements were examined in order to study the relationship between external Cu amount and internal plant response...
October 12, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29023367/effect-of-cadmium-and-copper-exposure-on-growth-secondary-metabolites-and-antioxidant-activity-in-the-medicinal-plant-sambung-nyawa-gynura-procumbens-lour-merr
#6
Mohd Hafiz Ibrahim, Yap Chee Kong, Nurul Amalina Mohd Zain
A randomized complete block (RCBD) study was designed to investigate the effects of cadmium (Cd) and copper (Cu) on the growth, bioaccumulation of the two heavy metals, metabolite content and antibacterial activities in Gyanura procumbens (Lour.) Merr. Nine treatments including (1) control (no Cd and Cu); (2) Cd 2 = cadmium 2 mg/L; (3) Cd 4 = cadmium 4 mg/L; (4) Cu 70 = copper 70 mg/L; (5) Cu 140 = copper 140 mg/L); (6) Cd 2 + Cu 70 = cadmium 2 mg/L + copper 70 mg/L); (7) Cd 2 + Cu 140 = cadmium 2 mg/L + copper 70 mg/L); (8) Cd 4 + Cu 70 = cadmium 4 mg/L+ copper 70 mg/L and (9) Cd 4 + Cu 140 = cadmium 4 mg/L + copper 140 mg/L) were evaluated in this experiment...
October 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29023113/kinetics-and-mechanisms-of-chemical-and-biological-agents-release-from-biopolymeric-microcapsules
#7
Marko Vincekovic, Slaven Jurić, Edyta Đermić, Snježana Topolovec-Pintarić
Kinetics and mechanisms of copper cations and Trichoderma viride spores release from uncoated and chitosan coated alginate microcapsules were investigated. The gelation of a fixed amount of sodium alginate at different concentrations of copper ion solutions resulted in distinct kinetics and release mechanisms. The increase in copper cation concentration promoted, but the presence of the chitosan layer on microcapsule surface and increase in microcapsule size reduced the rate of active agent release. Fitting to simple Korsmeyer-Peppas empirical model revealed the underlying release mechanism (Fickian diffusion or a combination of the diffusion and erosion mechanisms) depends on copper cation concentration and presence of T...
October 12, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29023006/expression-profile-of-stress-responsive-arabidopsis-thaliana-mirnas-and-their-target-genes-in-response-to-inoculation-with-pectobacterium-carotovorum-subsp-carotovorum
#8
A T Djami-Tchatchou, K Ntushelo
BACKGROUND: Pectobacterium carotovorum subsp. carotovorum (Pcc) is a soft rot bacterium which upon entry into the plant macerates plant tissues by producing plant cell wall degrading enzymes. It has a wide host range which includes carrot, potato, tomato, leafy greens, squash and other cucurbits, onion, green peppers and cassava. During plant-microbe interactions, one of the ways of plant response to pathogen infection is through the small RNA silencing mechanism. Under pathogen attack the plant utilizes microRNAs to regulate gene expression by means of mediating gene silencing at transcriptional and post-transcriptional level...
2017: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/29020924/plant-jasmonate-zim-domain-genes-shedding-light-on-structure-and-expression-patterns-of-jaz-gene-family-in-sugarcane
#9
Feng Liu, Tingting Sun, Ling Wang, Weihua Su, Shiwu Gao, Yachun Su, Liping Xu, Youxiong Que
BACKGROUND: Sugarcane smut caused by Sporisorium scitamineum is one of the most severe fungal diseases in the sugarcane industry. Using a molecular biological technique to mine sugarcane resistance genes can provide gene resources for further genetic engineering of sugarcane disease-resistant breeding. Jasmonate ZIM (zinc-finger inflorescence meristem) domain (JAZ) proteins, which involved in the responses to plant pathogens and abiotic stresses, are important signaling molecules of the jasmonic acid (JA) pathway...
October 11, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29017327/enhancing-the-bactericidal-efficacy-of-nanostructured-multifunctional-surface-using-an-ultra-thin-metal-coating
#10
Abinash Tripathy, Syama Sreedharan, Chetana Bhaskarla, Shamik Majumdar, Sudheer Kumar Peneti, Dipankar Nandi, Prosenjit Sen
Insects and plants exhibit bactericidal behaviour through nanostructures which leads to physical contact killing that does not require antibiotics or chemicals. Also, certain metallic ions (e.g. Ag+ & Cu2+) are well known to kill bacteria by disrupting their cellular functionalities. The aim of this study is to explore the improvement in bactericidal activity by combining extreme physical structure with surface chemistry. We have fabricated tall (8-9µm high) nanostructures on silicon surfaces (NSS) having sharp tips (35-110nm) using a single step maskless deep reactive ion etching technique inspired by dragonfly wing...
October 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29017014/effect-of-initial-speciation-of-copper-and-silver-based-nanoparticles-on-their-long-term-fate-and-phytoavailability-in-freshwater-wetland-mesocosms
#11
John P Stegemeier, Astrid Avellan, Gregory V Lowry
Ag0 and CuO engineered nanomaterials (ENMs), or their sulfidized forms are introduced into freshwater wetlands through wastewater effluent and agricultural runoff. Knowledge about the rates of transformations of these ENMs in realistic environments, and the impact of the form of the incoming ENM (i.e. sulfidized or pristine) on bioavailability and fate is limited. Here, five freshwater wetland mesocosms were exposed to 3g of total metal as CuO, CuS, Ag0 or Ag2S ENMs, or soluble CuNO3, added weekly for one month...
October 10, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28987987/a-sequential-treatment-of-intermediate-tropical-landfill-leachate-using-a-sequencing-batch-reactor-sbr-and-coagulation
#12
Zi Jun Yong, Mohammed J K Bashir, Choon Aun Ng, Sumathi Sethupathi, Jun-Wei Lim
The increase in landfill leachate generation is due to the increase of municipal solid waste (MSW) as global development continues. Landfill leachate has constantly been the most challenging issue in MSW management as it contains high amount of organic and inorganic compounds that might cause pollution to water resources. Biologically treated landfill leachate often fails to fulfill the regulatory discharge standards. Thus, to prevent environmental pollution, many landfill leachate treatment plants involve multiple stages treatment process...
October 5, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28985588/inter-and-intra-specific-competition-of-duckweed-under-multiple-heavy-metal-contaminated-water
#13
Zhao Zhao, Huijuan Shi, Xianjiang Kang, Cunqi Liu, Lingci Chen, Xiaofei Liang, Lei Jin
The influences of intra- and inter-species competition on ecosystems are poorly understood. Lemna aequinoctialis and Spirodela polyrhiza were used to assess the effects of exposure to different concentrations of multiple heavy metals (copper-cadmium-zinc), when the plants were grown in mixed- or mono-culture. Parameters assessed included relative growth rate (RGR), content of chlorophyll, glutathione (GSH), malondialdehyde (MDA), as well as the activity of catalase (CAT), superoxide dismutase (SOD) and peroxidase (POD)...
September 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28981522/redox-biology-response-in-germinating-phaseolus-vulgaris-seeds-exposed-to-copper-evidence-for-differential-redox-buffering-in-seedlings-and-cotyledon
#14
Inès Karmous, Rafael Trevisan, Ezzeddine El Ferjani, Abdelilah Chaoui, David Sheehan
In agriculture, heavy metal contamination of soil interferes with processes associated with plant growth, development and productivity. Here, we describe oxidative and redox changes, and deleterious injury within cotyledons and seedlings caused by exposure of germinating (Phaseolus vulgaris L. var. soisson nain hâtif) seeds to copper (Cu). Cu induced a marked delay in seedling growth, and was associated with biochemical disturbances in terms of intracellular oxidative status, redox regulation and energy metabolism...
2017: PloS One
https://www.readbyqxmd.com/read/28980167/effects-of-sulfur-on-toxicity-and-bioavailability-of-cu-for-castor-ricinus-communis-l-in-cu-contaminated-soil
#15
Chao Ren, Jinwei You, Yongbo Qi, Guoyong Huang, Hongqing Hu
The biogeochemical cycling of sulfur (S) in soil has an important impact on the bioavailability of heavy metals and affects the utilization of soil polluted by heavy metals. In addition, S-containing compounds are involved in heavy metal detoxification. This study investigated the effects of S on the toxicity and bioavailability of copper (Cu) in castor (Ricinus communis L.) grown in Cu-contaminated mine tailings. The results showed that the application of S reduced the accumulation of Cu in castor and promoted its growth...
October 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28979771/biomass-and-elemental-concentrations-of-22-rice-cultivars-grown-under-alternate-wetting-and-drying-conditions-at-three-field-sites-in-bangladesh
#16
Gareth J Norton, Anthony J Travis, John M C Danku, David E Salt, Mahmud Hossain, Md Rafiqul Islam, Adam H Price
As the global population grows, demand on food production will also rise. For rice, one limiting factor effecting production could be availability of fresh water, hence adoption of techniques that decrease water usage while maintaining or increasing crop yield are needed. Alternative wetting and drying (AWD) is one of these techniques. AWD is a method by which the level of water within a rice field cycles between being flooded and nonflooded during the growth period of the rice crop. The degree to which AWD affects cultivars differently has not been adequately addressed to date...
August 2017: Food and energy security
https://www.readbyqxmd.com/read/28974447/synergistic-toxicity-of-epigallocatechin-3-gallate-and-diethyldithiocarbamate-a-lethal-encounter-involving-redox-active-copper
#17
Ke Zhang, Ruixia Dong, Kang Sun, Xiaoxiao Wang, Jiajia Wang, Chung S Yang, Jinsong Zhang
Dithiocarbamates (DTC) are widely used in agricultural, industrial and therapeutic domains. There are ample opportunities for human exposure to DTC. Green tea extracts, with epigallocatechin-3-gallate (EGCG) being the most abundant constituent, have been used as dietary supplements for body weight reduction. Our hypothesis is that DTC can act as a copper ionophore to increase hepatic levels of redox-active copper which promotes EGCG auto-oxidation to produce oxidative stress and toxicity. The results of the present study in a mouse model is consistent with this hypothesis, showing that co-administration of EGCG and diethyldithiocarbamate - a metabolite of disulfiram (a drug for alcohol aversion therapy), both at tolerable levels, caused lethality...
September 30, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28974021/h%C3%A2-o%C3%A2-is-involved-in-the-metallothionein-mediated-rice-tolerance-to-copper-and-cadmium-toxicity
#18
Hongxiao Zhang, Shufang Lv, Huawei Xu, Dianyun Hou, Youjun Li, Fayuan Wang
Cadmium (Cd) and excess copper (Cu) are toxic to plants, causing a wide range of deleterious effects including the formation of reactive oxygen species. Metallothioneins (MTs) may protect plant cells from heavy metal toxicity by chelating heavy metals via cysteine thiol groups. They may also function as antioxidants. The study investigated the relationship of H₂O₂ production and ricMT expression in rice radicles and rice suspension cells under Cu or Cd stress. The results showed that H₂O₂ production in the rice radicles increased before Cu-induced ricMT expression, and after Cd-induced ricMT expression...
October 1, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28970839/the-effects-of-nitrogen-addition-on-the-uptake-and-allocation-of-macro-and-micronutrients-in-bothriochloa-ischaemum-on-loess-plateau-in-china
#19
Zemin Ai, Guoliang Wang, Chutao Liang, Hongfei Liu, Jiaoyang Zhang, Sha Xue, Guobin Liu
The effects of nitrogen (N) addition on the macro- and micronutrient concentrations, storage, and allocation of Bothriochloa ischaemum (L.) Keng, a native forage plant on the Loess Plateau in China remain unclear. We studied the effects of N addition at 0 (CK), 2.5 (N1), 5.0 (N2), and 10.0 (N3) g N m(-2) y(-1). N addition significantly decreased the available copper (Cu), zinc (Zn), and total Cu concentration, but significantly increased the available iron concentration in the soil. Cu, manganese (Mn), and sodium (Na) concentrations in aboveground tissues and potassium (K), magnesium, and Zn concentrations in belowground tissues significantly increased with N addition...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28965594/effects-of-binary-metal-combinations-on-zinc-copper-cadmium-and-lead-uptake-and-distribution-in-brassica-juncea
#20
Agnieszka Kutrowska, Arleta Małecka, Aneta Piechalak, Wacław Masiakowski, Anetta Hanć, Danuta Barałkiewicz, Barbara Andrzejewska, Janina Zbierska, Barbara Tomaszewska
The interaction between lead, copper, cadmium and zinc in their binary combinations was investigated in Indian mustard seedlings (Brassica juncea L. var. Malopolska). Fourteen-days-old seedlings were treated with Pb(NO3)2, CuSO4, CdCl2, ZnSO4 at 50μmol of metal ion concentration and at 25μmol of each metal ion in combinations. Metal combinations were generally more inhibiting in terms of biomass production. This inhibiting effect followed an order: Cu+Cd>Cu+Zn, Cd+Pb>Cu+Pb>Zn+Pb, Cu>Cd>Zn>Zn+Cd>Pb...
December 2017: Journal of Trace Elements in Medicine and Biology
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