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https://www.readbyqxmd.com/read/30556695/unexpected-observation-of-heavy-monomeric-motifs-in-a-basket-like-au-26-ag-22-nanocluster
#1
Hao Li, Yongbo Song, Ying Lv, Yapei Yun, Xinrou Lv, Haizhu Yu, Manzhou Zhu
Herein, a new basket-like Au26 Ag22 (TBBT)30 nanocluster (where TBBT = 4- tert-butylthiophenol) was synthesized by a coreduction method. Also, the precise structure was characterized by single-crystal X-ray diffraction and displays a shell-by-shell construction with a Au12 @AuAg19 kernel protected by a Au13 S26 @Ag3 S4 surface motif. Interestingly, a handle-like Ag3 S4 motif was observed that composes the outermost shell. Except for this Ag3 S4 motif, the other motifs are all monomeric "-S-Au-S-" motifs, which are rarely reported in thiolate-capped metal (Au or Ag) nanoclusters with small size ( n < 60)...
December 17, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30556693/urea-based-metal-organic-frameworks-as-high-and-fast-adsorbent-for-hg-2-and-pb-2-removal-from-water
#2
Azar Hakimifar, Ali Morsali
Water pollution by various toxic heavy-metal ions, particularly mercury and lead, has been considered as a global problem with serious threat to public health. Nowadays, a variety of adsorbents have been used extensively for the removal of heavy-metal ions from water. In this work, two Zn-based metal-organic frameworks (MOFs), named TMU-31 and TMU-32, were successfully synthesized by a solid-state method named mechanosynthesis, which can be considered as a rapid, green, convenient, solventless, and low-cost process...
December 17, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30556084/phosphorescent-pt-ii-complexes-spatially-arrayed-in-micellar-polymeric-nanoparticles-providing-dual-readout-for-multimodal-imaging
#3
Maria T Proetto, Jan Sanning, Martin Peterlechner, Martin Thunemann, Linda Stegemann, Sanaz Sadegh, Anna Devor, Nathan C Gianneschi, Cristian A Strassert
In this paper we report phosphorescent Pt(ii) complexes as monomers which can be directly incorporated into growing polymers. Due to the amphiphilic nature of the polymers they can self-assemble into micellar nanoparticles, where the phosphorescent Pt(ii) complexes can arrange selectively in the core or shell of the nanoparticles. The complexes enable dual orthogonal imaging, made possible by the heavy metal, which enhances the contrast for these micelles in electron microscopy and facilitates spin-orbit coupling that turns on microsecond lifetime luminescence...
December 17, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/30556021/spectroscopic-studies-on-dual-role-of-natural-flavonoids-in-detoxification-of-lead-poisoning-bench-to-bedside-preclinical-trial
#4
Aniruddha Adhikari, Soumendra Darbar, Tanima Chatterjee, Monojit Das, Nabarun Polley, Maitree Bhattacharyya, Siddhartha Bhattacharya, Debasish Pal, Samir Kumar Pal
Ubiquitousness in the target organs and associated oxidative stress are the most common manifestations of heavy-metal poisoning in living bodies. While chelation of toxic heavy metals is important as therapeutic strategy, scavenging of increased reactive oxygen species, reactive nitrogen species and free radicals are equally important. Here, we have studied the lead (Pb) chelating efficacy of a model flavonoid morin using steady-state and picosecond-resolved optical spectroscopy. The efficacy of morin in presence of other flavonoid (naringin) and polyphenol (ellagic acid) leading to synergistic combination has also been confirmed from the spectroscopic studies...
November 30, 2018: ACS Omega
https://www.readbyqxmd.com/read/30555981/kinetics-and-adsorption-studies-of-mercury-and-lead-by-ceria-nanoparticles-entrapped-in-tamarind-powder
#5
Rekha Sharma, Sapna Raghav, Manjula Nair, Dinesh Kumar
In this study, novel adsorbent ceria nanoparticles (CeNPs) entrapped in tamarind powder (Tm@CeNPs) were efficiently utilized for the simultaneous adsorption of aqueous mercury [Hg(II)] and aqueous lead [Pb(II)]. Surface interactions between the adsorbent and heavy metal ions play an important role in the adsorption process, and the surface morphology can significantly improve the adsorption capacity of the adsorbent. The Langmuir adsorption capacity of Tm@CeNPs for Hg(II) and Pb(II) was found to be 200 and 142...
November 30, 2018: ACS Omega
https://www.readbyqxmd.com/read/30555856/dataset-on-structure-and-mechanical-properties-of-electrospun-polyacrylonitrile-nanofibrous-mesh-reinforced-by-halloysite-nanotubes
#6
K L Goh, M Makaremi, P Pasbakhsh, R De Silva, V Zivkovic
The mechanical properties of electrospun polyacrylonitrile (PAN)-based membranes for ultrafiltration, such as oil-water separation and heavy metals from water, are often characterised in the dry state but little is known about the membrane properties in the hydrated state. This dataset comprised mechanical properties and structure-related properties of electrospun PAN-based membranes. The mechanical dataset described the yield strength and strain, stiffness, resilience energy, fracture strength, strain at fracture and fracture toughness of electrospun neat PAN and halloysite nanotube (HNT) reinforced PAN membranes in both hydrated and dry states...
December 2018: Data in Brief
https://www.readbyqxmd.com/read/30555504/overexpression-of-acyl-coa-binding-protein-1-chacbp1-from-saline-alkali-tolerant-chlorella-sp-enhances-stress-tolerance-in-arabidopsis
#7
Kun Qiao, Min Wang, Tetsuo Takano, Shenkui Liu
A large proportion of the world's arable land is saline-alkali land, and this is becoming an urgent environmental problem for agriculture. One approach to address this problem is to develop new varieties of stress-resistant plants through genetic engineering. The algae ( Chlorella sp. ) JB6, which was previously isolated from saline-alkali land, was found to exhibit strong NaHCO3 tolerance. Here, we explored saline-alkali-tolerance genes in this alga that might be useful for producing abiotic stress-resistant transgenic plants...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/30555249/methicillin-resistant-staphylococcus-aureus-livestock-associated-antimicrobial-and-heavy-metal-resistance
#8
REVIEW
Cwengile C Dweba, Oliver T Zishiri, Mohamed E El Zowalaty
Staphylococcus aureus is an opportunistic pathogen of human and other mammals that is of increasing clinical and veterinary importance due to its ability to rapidly develop antimicrobial resistance. The injudicious use of antibiotics has given rise to the emergence of antibiotic resistant S. aureus strains, most importantly methicillin-resistant Staphylococcus aureus (MRSA). The emergence of livestock-associated MRSA (LA-MRSA) has highlighted the importance of directed research toward its prevention, as well as the need for the discovery and development of more efficient treatment than is currently available...
2018: Infection and Drug Resistance
https://www.readbyqxmd.com/read/30554351/the-effect-of-environmental-factors-on-total-arsenic-accumulation-in-sarcodia-suiae-rhodophyta
#9
Meng-Chou Lee, Mary Joy Halog Libatique, Siao-Yu Yeh
Little is known about the effects of environmental factors on total arsenic (TAs) accumulation in marine Rhodophyta. The effects of five environmental factors (temperature, light intensity, pH, exposure duration, and phosphate) at various As(III) concentrations were investigated in Sarcodia suiae. The highest TAs accumulations were recorded at 25°C, a luminance of 80 µmol photons m-2  s-1 , and a pH of 8. TAs uptake increased significantly over time. However, a higher phosphate concentration reduced TAs accumulation...
December 15, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/30553960/fate-of-antibiotic-resistance-genes-during-anaerobic-digestion-of-sewage-sludge-role-of-solids-retention-times-in-different-configurations
#10
Junya Zhang, Jibao Liu, Tiedong Lu, Peihong Shen, Hui Zhong, Juan Tong, Yuansong Wei
In this study, three anaerobic digestion experiments were established to investigate the effects of solids retention times (SRT) on the fate of antibiotic resistance genes (ARGs) including anaerobic digestion of sewage sludge (CK), one-stage anaerobic digestion of microwave pretreatment sludge (MW) and two-stage anaerobic digestion of microwave pretreatment sludge (Acid stage and CH4 stage). The response of ARGs to the SRT varied significantly from ARG types and reactor configurations. Shorter SRT could avail the ARGs reduction for CK and two-stage digestion, while MW need longer SRT for the ARGs reduction...
December 4, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/30553947/response-of-the-biomining-acidithiobacillus-ferrooxidans-to-high-cadmium-concentrations
#11
Javiera Ramos-Zúñiga, Sebastian Gallardo, Cristóbal Martínez-Bussenius, Rodrigo Norambuena, Claudio A Navarro, Alberto Paradela, Carlos A Jerez
Cadmium is a heavy metal present in contaminated soils. It has no biological role but when entering cells generates DNA damage, overexpression of stress response proteins and misfolded proteins, amongst other deleterious effects. Acidithiobacillus ferrooxidans is an acidophilic bacterium resisting high concentrations of heavy metals such as cadmium. This is important for industrial bioleaching processes where Cd+2 concentrations can be 5-100 mM. Cadmium resistance mechanisms in these microorganisms have not been fully characterized...
December 13, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/30553926/investigating-the-effect-of-copper-and-magnesium-ions-on-nitrogen-removal-capacity-of-pure-cultures-by-modified-non-competitive-inhibition-model
#12
Tengxia He, Deti Xie, Jiupai Ni, Xi Cai, Zhenlun Li
Copper, a common heavy metal, may be beneficial for or poisonous to microbial activity. The objective of this study was to determine the effect of different copper ion concentrations on the nitrogen removal performance of Arthrobacter arilaitensis strain Y-10 and Pseudomonas taiwanensis strain J488. The non-competitive inhibition model was employed to evaluate the 50% inhibition concentrations (IC50 values) of copper ions toward the pure strains. In the absence of magnesium ions, a low concentration of copper (0...
December 13, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30553391/preparation-and-characterization-of-cellulose-based-adsorbent-and-its-application-in-heavy-metal-ions-removal
#13
Jian Wang, Min Liu, Chao Duan, Jianpeng Sun, Yaowei Xu
In this work, we develop a facile route to prepare a cellulose-based adsorbent, namely carboxymethylated cellulose fiber (CMF), for the water purification. The as-prepared CMF bio-adsorbent was synthesized via a controllable carboxymethylation modification in the case of maintaining inherent fibrous framework. The CMF bio-adsorbent was applied to adsorb the heavy metal ions, such as Cu(II) and Ni(II), from aqueous solution. Results showed that the CMF adsorbent exhibited excellent adsorption capacity toward these ions and a higher selectivity for the Cu(II) removal based on surface complexation and electrostatic interaction mechanisms...
February 15, 2019: Carbohydrate Polymers
https://www.readbyqxmd.com/read/30553214/concentrations-speciation-and-ecological-risk-of-heavy-metals-in-the-sediment-of-the-songhua-river-in-an-urban-area-with-petrochemical-industries
#14
Caiyun Sun, Zhenxing Zhang, Hainan Cao, Miao Xu, Liang Xu
In this study, the pollution status and the ecological risks of heavy metals (Cu, Zn, Pb, Ni and Cr) in the sediments of the Songhua River in an urban area with petrochemical industries were assessed. The highest mean concentration of total heavy metals occurred in the freezing period, and the highest total heavy metal concentrations were observed near the petrochemical industrial area. The geo-accumulation index indicated that Cu was the most contaminated heavy metal. The potential ecological risk index suggested that the total and individual heavy metal concentrations in the sediment were associated with low ecological risk...
December 10, 2018: Chemosphere
https://www.readbyqxmd.com/read/30553211/effects-of-biochar-on-growth-and-heavy-metals-accumulation-of-moso-bamboo-phyllostachy-pubescens-soil-physical-properties-and-heavy-metals-solubility-in-soil
#15
Ying Wang, Bin Zhong, Mohammad Shafi, Jiawei Ma, Jia Guo, Jiasen Wu, Zhengqian Ye, Dan Liu, Hexian Jin
Pot experiment was conducted to investigate the effects of wood biochar (5%), bamboo biochar (5%), rice straw biochar (5%) and Chinese walnut shell biochar (5%) on growth, accumulation of heavy metals in moso bamboo, soil physical properties, and solubility of heavy metals in soil. The results revealed that dry weight of moso bamboo was significantly increased in treatments of wood biochar (5%), rice straw biochar (5%) and Chinese walnut shell biochar (5%) except bamboo biochar (5%). Application of straw biochar (5%) was most effective in enhancing plants biomass, with increase of 157%, 113% and 111% in leaves, roots and stems of moso bamboo...
November 26, 2018: Chemosphere
https://www.readbyqxmd.com/read/30553186/primary-cultured-neuronal-networks-and-type-2-diabetes-model-mouse-fatty-liver-tissues-in-aqueous-liquid-observed-by-atmospheric-sem-asem-staining-preferences-of-metal-solutions
#16
Chikara Sato, Toshiko Yamazawa, Akiko Ohtani, Yuusuke Maruyama, Nassirhadjy Memtily, Mari Sato, Yuri Hatano, Takashi Shiga, Tatsuhiko Ebihara
Neural networking, including axon targeting and synapse formation, is the basis of various brain functions, including memory and learning. Diabetes-mellitus affects peripheral nerves and is known to cause fatty liver disease. Electron microscopy (EM) provides the resolution required to observe changes in fine subcellular structures caused by such physiological and pathological processes, but samples are observed in vacuum. Environmental capsule EM can directly observe cells in a more natural aqueous environment, but the size-limited capsules restrict cell culturability...
November 23, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30553081/key-role-of-cyromazine-in-the-distribution-of-antibiotic-resistance-genes-and-bacterial-community-variation-in-aerobic-composting
#17
Honghong Guo, Jie Gu, Xiaojuan Wang, Xiaxia Tuo, Jing Yu, Ranran Zhang
The risks that have not been noted so far have come from the use of non-antibiotics. In this study, non-antibiotic drug (cyromazine) was used in composting to investigate its possible effects on the distribution of ARGs and changes of bacterial community. Results showed that cyromazine increased the abundances of highly-risky ARGs (blaCTX-M and blaVIM ), and heavy metal resistance genes (MRGs). Low and high concentrations of cyromazine increased the abundance of Tn916/1545 by 18.27% and 64.26%, respectively, compared with the control treatment...
December 3, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/30553018/enhanced-remedial-effects-for-vitamin-d-3-and-calcium-co-supplementation-against-pre-existing-lead-nephrotoxicity-in-mice-the-roles-of-renal-calcium-homeostatic-molecules
#18
Riyad A Almaimani, Hussain Almasmoum, Mazen M Ghaith, Mohamed El-Boshy, Shakir Idris, Jawwad Ahmad, Abdelghany H Abdelghany, Mohammad A BaSalamah, Amani Mahbub, Bassem Refaat
BACKGROUND: Lead (Pb) is a toxic heavy metal and nephropathy is common with chronic exposure. Although vitamin D (VD) and calcium (Ca) showed promising protections, their co-administration was not previously investigated in Pb nephrotoxicity. This study measured the potential interactions and remedial effects of VD and/or Ca on established Pb nephropathy. METHODS: Fifty adult male mice were equally distributed into: negative controls (NC), positive controls (PC), Ca, VD and VDC groups...
December 12, 2018: Biochimica et biophysica acta. Molecular basis of disease
https://www.readbyqxmd.com/read/30552976/assembling-a-genome-for-novel-nitrogen-fixing-bacteria-with-capabilities-for-utilization-of-aromatic-hydrocarbons
#19
Hitesh Tikariha, Hemant J Purohit
Metagenome from refinery wastewater treatment plant running under nitrogen stress was analyzed for mining of novel aromatic hydrocarbon-degrading bacteria. The sequence data were assembled using metaspade followed by binning using the Metabat tool to assemble genome; where coverage and depth were calculated using bowtie and samtools. The analysis picked a novel genome belonging to family Bradyrhizobiaceae, identified based on 16S rDNA gene which was supported by CheckM and Kraken analysis. Using RAST, the assembled genome showed the capabilities for nitrogen fixation with the utilization of multiple hydrocarbon substrates with 14 different types of oxygenases as mapped by Minpath...
December 12, 2018: Genomics
https://www.readbyqxmd.com/read/30552597/concentration-sources-and-human-health-risk-of-heavy-metals-and-polycyclic-aromatic-hydrocarbons-bound-pm-2-5-ambient-air-tehran-iran
#20
Saeed Motesaddi Zarandi, Abbas Shahsavani, Fariba Khodagholi, Yadolah Fakhri
The exposure to heavy metals and polycyclic aromatic hydrocarbons (PAHs) bound to particulate matter 2.5 (PM2.5 ) ambient air can result in some adverse health effect. In the current study, PM2.5 ambient air of Tehran metropolitan, Iran, was characterized by the aid of scanning electron microscope and energy-dispersive X-ray techniques. Also, the human health risk of heavy metals and PAHs bound PM2.5 for adults and children was assessed using the Monte Carlo simulation method. According to our findings, a size range of 0...
December 14, 2018: Environmental Geochemistry and Health
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