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1.
J Colloid Interface Sci ; 631(Pt A): 17-24, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36368213

RESUMO

Aqueous zinc (Zn)-ion energy storage system is widely regarded as a promising candidate for future electrochemical energy storage applications but suffers insufficient lifespan and limited operating temperature. To address these issues, we introduce a carbitol additive for a novel hybrid electrolyte to enhance cycling stability and temperature adaptability by optimizing the coordination structure of Zn ion. The modified electrolyte not only restrains the hydrogen evolution, but also promotes a high-orientation Zn deposition and significantly limits the Zn dendrite growth. Taking advantage of improved electrolyte properties, the Zn symmetric cells with 10 % carbitol-modified electrolyte exhibit long-term cycle stability for 5000 h at 25 °C, and 400 h at -10 °C. More notably, the carbitol-modified electrolyte endows a stable reversible capacitance for Zn ion hybrid supercapacitors to be operated at different temperatures. Our work affords a reasonable electrolyte engineering strategy to fabricate a highly stable and low-temperature-tolerant Zn ion storage system.


Assuntos
Eletrólitos , Zinco , Zinco/química , Temperatura , Capacitância Elétrica
2.
Carbohydr Polym ; 300: 120249, 2023 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-36372481

RESUMO

Obesity-induced lipid metabolism disorders are risk factors for hyperlipidemia, atherosclerosis, and non-alcoholic fatty liver disease. Seaweed oligosaccharides and Zn supplements are potential alternatives to alleviate obesity. Herein, ulvan oligosaccharide (UO) was used as a ligand to prepare a novel Zn supplement (UO-Zn). Subsequently, we explored potential mechanisms underlying UO- and UO-Zn-mediated improvements in lipid metabolism in mice fed a high-fat diet. We found that UO enhanced the abundance of key species (Blautia and Turicibacter) and functions (glycolytic, pentose phosphate, and histidine/lysine biosynthesis pathways) in the gut microbiota, thereby increasing the production of short-chain fatty acids and activating AMPK. Accordingly, UO treatment regulated the transcription of lipid metabolism genes, including ACOX1, ACC, and FASN, thereby reducing blood lipid levels and hepatic lipid accumulation. Zn could act synergistically with UO, enhancing the reversal of cholesterol transport and fatty acid ß-oxidation via the MTF1/PPARα pathway, markedly reducing body and adipose tissue weights.


Assuntos
Dieta Hiperlipídica , Metabolismo dos Lipídeos , Camundongos , Animais , Dieta Hiperlipídica/efeitos adversos , Zinco/farmacologia , Oligossacarídeos/farmacologia , Oligossacarídeos/metabolismo , Fígado , Obesidade/tratamento farmacológico , Obesidade/metabolismo , Lipídeos , Camundongos Endogâmicos C57BL
3.
Behav Brain Res ; 437: 114163, 2023 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-36265761

RESUMO

Sodium benzoate (SB) is a commonly-used food preservative, with a controversial report to its neurological benefit and toxicity. Zinc (Zn) is a trace element that plays a crucial role in memory, inflammation and oxidative stress. This study was to investigate the effect of SB on rat cognition and memory and the possible modulatory effect of Zn supplement. Twenty four male Wistar rats were divided into four groups of six animals each. Animals in groups 1-4 were treated with normal saline 1 ml/kg, SB 200 mg/kg, zinc sulphate 10 ml/kg and SB 200 mg/kg + zinc sulphate 10 ml/kg/day daily respectively for three weeks. After treatment, the animals were subjected to different behavioural tests, and then sacrificed. Their blood samples were collected for catalase(CAT), superoxide dismutase(SOD) and interleukin-1B(IL-1B) assay. Brain samples were also collected for nuclear factor-erythroid-related factor 2(Nrf2), and acetylcholinesterase (AchE) mRNA gene expression. The serum levels of CAT and SOD were (p < 0.0001; p < 0.0001) reduced in the SB only-treated group compared to the other groups. Nrf2 gene expression was totally shut down in the SB only-treated group but, up-regulated in the Zn-treated groups (p < 0.0001). The serum level of IL-1B was higher in the SB only-treated group compared to the other groups. SB-treated group spent longer time in the close arm (p = <0.0001), shorter time in the open arm (p = <0.0001) and had higher anxiety index (p = 0.0045) than the Zn-treated groups. Conclusively, Zinc improves memory deficit, has anxiolytic, anti-oxidant and anti-inflammatory properties.


Assuntos
Fator 2 Relacionado a NF-E2 , Síndromes Neurotóxicas , Animais , Masculino , Ratos , Ratos Wistar , Fator 2 Relacionado a NF-E2/metabolismo , Benzoato de Sódio/farmacologia , Acetilcolinesterase/metabolismo , Sulfato de Zinco , Memória de Curto Prazo , Regulação para Cima , Estresse Oxidativo , Superóxido Dismutase/metabolismo , Antioxidantes/farmacologia , Antioxidantes/metabolismo , Zinco/farmacologia , Zinco/metabolismo
4.
J Inorg Biochem ; 238: 112023, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36270041

RESUMO

Lactobacillaceae are a diverse family of lactic acid bacteria found in the gut microbiota of humans and many animals. These bacteria exhibit beneficial effects on intestinal health, including modulating the immune system and providing protection against pathogens, and many species are frequently used as probiotics. Gut bacteria acquire essential metal ions, like iron, zinc, and manganese, through the host diet and changes to the levels of these metals are often linked to alterations in microbial community composition, susceptibility to infection, and gastrointestinal diseases. Lactobacillaceae are frequently among the organisms increased or decreased in abundance due to changes in metal availability, yet many of the molecular mechanisms underlying these changes have yet to be defined. Metal requirements and metallotransporters have been studied in some species of Lactobacillaceae, but few of the mechanisms used by these bacteria to respond to metal limitation or excess have been investigated. This review provides a current overview of these mechanisms and covers how iron, zinc, and manganese impact Lactobacillaceae in the gut microbiota with an emphasis on their biochemical roles, requirements, and homeostatic mechanisms in several species.


Assuntos
Microbioma Gastrointestinal , Humanos , Animais , Lactobacillaceae , Manganês/farmacologia , Bactérias , Zinco/farmacologia , Ferro/farmacologia
5.
Sci Total Environ ; 856(Pt 2): 159264, 2023 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-36208763

RESUMO

Soil heterogeneity makes the vertical distribution of metal(loid)s in site soil vary considerably and poses a challenge for identifying the key factors of metal(loid)s migration in site soil profiles. In this study, a machine learning (ML) model was developed to study a typical abandoned Pb/Zn smelter using 267 site soils from 46 drilling points. Results showed that a well-trained ML model could be used to identify the key factors in determining the contamination vertical distribution and predict the metal(loid)s contents in subsurface soil. As, Cd, Pb, and Zn were the primary pollutants and their vertical migration depth arrived to 4-6 m. Based on the predictive performance of different ML algorithms, the extreme gradient boosting (XGB) was selected as the best model to produce accurate predictions for the most metal(loid)s content. Contents of As, Cd, Pb, and Zn in the heavily contaminated zones declined with an increase of soil depth. The metal(loid) contents in surface soil of 0-2 m could be readily used to predict the content of Cd, Cr, Hg, and Zn in subsurface soil from 2 m to 10 m. Based on the metal-specific XGB models, sulfur content, functional area, and soil texture were identified as key factors affecting the vertical distribution of As, Cd, Pb, and Zn in site soil. Results suggested the ML method is helpful to manage the potential environmental risks of metal(loid)s in Pb/Zn smelting site.


Assuntos
Metaloides , Metais Pesados , Poluentes do Solo , Solo , Metais Pesados/análise , Poluentes do Solo/análise , Chumbo , Cádmio , Monitoramento Ambiental/métodos , Zinco/análise , Aprendizado de Máquina , China , Medição de Risco
6.
Chemosphere ; 311(Pt 1): 136878, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36419267

RESUMO

Migration of soil pollutants can cause groundwater pollution, which is dominated by the soil adsorption of pollutants. Heavy metals and fluoroquinolone antibiotics exist in the soil and form compound pollution, with different adsorption behaviors in the soil. It may make the levofloxacin (LVFX) migration and potential risk of LVFX to groundwater change. Therefore, this research on Zinc (Zn/Zn2+) and LVFX studied the binary adsorption on silty clay in the vadose zone using the batch equilibrium adsorption method. Besides, Hydrus-1D simulate vertical migration. As the results show: (1) Silty clay has excellent storage capacity (adsorption rate>90%) for LVFX and is a natural barrier to reducing groundwater risk; (2) Binary adsorption of LVFX with Zn on silty clay had could be influenced by metallic oxide, pH value, and cation species. The metallic oxides adsorption rate decreased by 10.3%; Compared with single adsorption, Zn2+ promoted the adsorption of LVFX on silty clay, with the exception that the pH value was 2.0; Based on the simulated migration, subtle changes in adsorption may lead to a significant difference in migration and impact on the environmental risk of LVFX to groundwater. This paper proposed three aspects of the research should be strengthened to further develop the potential of silty clay in the prevention and control of groundwater pollution.


Assuntos
Água Subterrânea , Águas Residuárias , Argila , Adsorção , Levofloxacino , Zinco , Solo , Óxidos
7.
J Environ Manage ; 325(Pt A): 116572, 2023 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-36419286

RESUMO

This study aims to investigate the water-leaching characteristics of heavy metal(loid)s (HMs) from historical Pb-Zn mine tailing of an abandoned tailing deposit in eastern China. Up-flow column and batch leaching tests were conducted at different liquid-to-solid (L/S) ratios to estimate the releases of HMs and investigate the controlling mechanisms. Calcite and silicate were the dominant minerals in the tailing and the HMs contents followed the order of Zn (2371 mg/kg) > Pb (2061 mg/kg) > Cu (109 mg/kg) > Cr (47.8 mg/kg) > As (15.9 mg/kg) > Cd (5.1 mg/kg). Moreover, considerable fractions of Pb, Zn, and Cd existed in the acid-soluble forms (41-47%). Column and batch leaching tests consistently showed that limited quantities (<0.002%) of HMs could be leached from this historical tailing. In particular, variations in column conditions (e.g., length, flow rate, and initial saturation) significantly affected the release fluxes from the columns but had a relatively limited effect on the leaching mechanisms. The estimated results of HM release suggested that the leaching process was predominantly solubility-controlled and the dissolution of Ca-bearing minerals (e.g., calcite) primarily controlled the release of HMs. The studied tailing had a limited impact on the quality of the surrounding aquatic environments because the water-leaching concentrations of HMs were generally lower than the Chinese standards for drinking water. Only for Pb, the leaching results in column tests were significantly lower than those in batch tests; whereas the results in column tests for other HMs were comparable to those in batch tests to a certain extent. Based on the column test results, the amounts of HMs potentially released from the abandoned tailing deposit (height, 10 m; footprint area, 30,000 m2; tailing dry density, 1.9 × 103 kg/m3) followed a decreasing order of Zn (4.2 × 105 kg) > Cu (2.3 × 104 kg) > Pb (1.4 × 104 kg) > Cr (2.3 × 104 kg) > Cd (1.6 × 103 kg) > As (1.2 × 103 kg) over the 75-year assessment period (corresponding to an L/S ratio of 10 L/kg with an annual precipitation of 1500 mm).


Assuntos
Chumbo , Metais Pesados , Cádmio , Carbonato de Cálcio , Mineração , Zinco
8.
Talanta ; 251: 123749, 2023 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-35926415

RESUMO

This study illustrates the successful application of near-infrared reflectance spectroscopy extended with chemometric modeling to profile Cd, Cu, Pb, Ni, Cr, Zn, Mn, and Fe in cultivated and fertilized Haplic Luvisol soils. The partial least-squares regression (PLSR) models were built to predict the elements present in the soil samples at very low contents. A total of 234 soil samples were investigated, and their reflectance spectra were recorded in the spectral range of 1100-2500 nm. The optimal spectral preprocessing was selected among 56 different scenarios considering the root mean squared error of prediction (RMSEP). The partial robust M-regression method (PRM) was used to handle the outlying samples. The most promising models were obtained for estimating the amount of Cu (using PRM) and Pb (using the classic PLS), leading to RMSEP expressed as a percentage of the response range, equal to 9.63% and 11.5%, respectively. The respective coefficients of determination for validation samples were equal to 0.86 and 0.58, respectively. Assuming similar variability of model residuals for the model and test set samples, coefficients of determination for validation samples were 0.94 and 0.89, respectively. Moreover, the favorable PLS models were also built for Zn, Mn, and Fe with coefficients of determinations equal to 0.87, 0.87, and 0.79.


Assuntos
Metais Pesados , Poluentes do Solo , Cádmio , Quimiometria , Monitoramento Ambiental/métodos , Chumbo , Metais Pesados/análise , Solo/química , Poluentes do Solo/análise , Espectroscopia de Luz Próxima ao Infravermelho/métodos , Zinco/análise
9.
Methods Mol Biol ; 2571: 123-132, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36152156

RESUMO

In this chapter, we describe a metallomics method based on protein precipitation under non-denaturing conditions and further analysis by inductively coupled plasma mass spectrometry for high-throughput metal speciation in plasma and erythrocyte samples. This methodology enables to study the total multielemental profile of these biological matrices, as well as to quantify the metal fractions conforming the metallometabolome and the metalloproteome. Furthermore, the analytical coverage comprises several essential and toxic metal elements, namely aluminum, arsenic, cadmium, cobalt, chromium, copper, iron, lithium, manganese, molybdenum, nickel, lead, selenium, vanadium, and zinc. Altogether, the metallomics method here proposed represents an excellent approach to comprehensively characterize the metal biodistribution in human peripheral blood, which would enable to decipher the role of metal homeostasis in health and disease, and particularly in childhood obesity.


Assuntos
Arsênio , Obesidade Pediátrica , Selênio , Alumínio , Cádmio/análise , Criança , Cromo , Cobalto , Cobre/análise , Humanos , Ferro/análise , Lítio , Manganês , Molibdênio , Níquel , Distribuição Tecidual , Vanádio , Zinco/análise
10.
J Environ Sci (China) ; 124: 451-461, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36182153

RESUMO

Inflammation is a major adverse outcome induced by inhaled particulate matter with a diameter of ≤ 2.5 µm (PM2.5), and a critical trigger of most PM2.5 exposure-associated diseases. However, the key molecular events regulating the PM2.5-induced airway inflammation are yet to be elucidated. Considering the critical role of circular RNAs (circRNAs) in regulating inflammation, we predicted 11 circRNAs that may be involved in the PM2.5-induced airway inflammation using three previously reported miRNAs through the starBase website. A novel circRNA circ_0008553 was identified to be responsible for the PM2.5-activated inflammatory response in human bronchial epithelial cells (16HBE) via inducing oxidative stress. Using a combinatorial model PM2.5 library, we found that the synergistic effect of the insoluble core and loaded Zn2+ ions at environmentally relevant concentrations was the major contributor to the upregulation of circ_0008553 and subsequent induction of oxidative stress and inflammation in response to PM2.5 exposures. Our findings provided new insight into the intervention of PM2.5-induced adverse outcomes.


Assuntos
MicroRNAs , RNA Circular , Células Epiteliais/metabolismo , Humanos , Inflamação/induzido quimicamente , MicroRNAs/metabolismo , Estresse Oxidativo , Material Particulado/toxicidade , Zinco/toxicidade
11.
J Environ Sci (China) ; 125: 662-677, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-36375948

RESUMO

Smelting activities pose serious environmental problems due to the local and regional heavy metal pollution in soils they cause. It is therefore important to understand the pollution situation and its source in the contaminated soils. In this paper, data on heavy metal pollution in soils resulting from Pb/Zn smelting (published in the last 10 years) in China was summarized. The heavy metal pollution was analyzed from a macroscopic point of view. The results indicated that Pb, Zn, As and Cd were common contaminants that were present in soils with extremely high concentrations. Because of the extreme carcinogenicity, genotoxicity and neurotoxicity that heavy metals pose, remediation of the soils contaminated by smelting is urgently required. The primary anthropogenic activities contributing to soil pollution in smelting areas and the progressive development of accurate source identification were performed. Due to the advantages of biominerals, the potential of biomineralization for heavy metal contaminated soils was introduced. Furthermore, the prospects of geochemical fraction analysis, combined source identification methods as well as several optimization methods for biomineralization are presented, to provide a reference for pollution investigation and remediation in smelting contaminated soils in the future.


Assuntos
Metais Pesados , Poluentes do Solo , Poluentes do Solo/análise , Chumbo/análise , Biomineralização , Monitoramento Ambiental/métodos , Metais Pesados/análise , Poluição Ambiental/análise , Solo , China , Zinco/análise , Medição de Risco
12.
J Environ Sci (China) ; 125: 73-81, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-36375954

RESUMO

The ultimate purpose of phytoextraction is not only to remove heavy metals from soil but also to improve soil quality. Here, we evaluated how the joint effect of Streptomyces pactum (strain Act12) and inorganic (Hoagland's solution) and organic (humic acid and peat) nutrients affected the phytoextraction practice of cadmium (Cd) and zinc (Zn) by potherb mustard, and the microbial community composition within rhizosphere was also investigated. The results indicated that the nutrients exerted synergistically with Act12, all increasing the plant biomass and Cd/Zn uptakes. The inoculation of Act12 alone significantly increased dehydrogenase activity of rhizosphere soil (P < 0.05), while urease and alkaline phosphatase activities varied in different dosage of Act12. Combined application of microbial strain with nutrients increased enzymatic activities with the elevated dosage of Act12. 16S ribosomal RNA high-throughput sequencing analysis revealed that Act12 inoculation reduced the diversity of rhizosphere bacteria. The Act12 and nutrients did not change dominant phyla i.e., Proteobacteria, Bacteroidetes, Gemmatimonadetes, Actinobacteria and Acidobacteria, but their relative abundance differed among the treatments with: Peat > Act12 > Humic acid > Hoagland's solution. Comparatively, Sphingomonas replaced Thiobacillus as dominant genus after Act12 application. The increase in the Sphingomonas and Flavisolibacter abundances under Act12 and nutrients treatments gave rise to growth-promoting effect on plant. Our results revealed the important role for rhizosphere microbiota in mediating soil biochemical traits and plant growth, and our approach charted a path toward the development of Act12 combined with soil nutrients to enhance soil quality and phytoextraction efficiency in Cd/Zn-contaminated soils.


Assuntos
Cádmio , Poluentes do Solo , Cádmio/análise , Poluentes do Solo/análise , Biodegradação Ambiental , Substâncias Húmicas/análise , Solo/química , Rizosfera , Microbiologia do Solo , Zinco/análise
13.
Sci Total Environ ; 857(Pt 2): 159385, 2023 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-36243074

RESUMO

Amine/hydrazone functionalized dual ligand Cd(II)/Zn(II) based metal-organic frameworks (MOFs) denoted as CdMOF- and ZnMOF-NH2, respectively were synthesized via a simple conventional high-yield reflux method using low-cost and readily available starting materials, i.e., a Schiff base linker, 4-pyridylcarboxaldehydeisonicotinoylhydrazone (L1) and 2-aminoterephthalic acid (H2ata) linker. Crystallographic and thermogravimetric studies confirmed the formation of MOFs with good crystallinity and thermal stability. Photoluminescence studies point out that both MOFs can be used efficiently for fast sensing of 2,4,6-trinitrophenol (TNP) in water with noticeable turn-off quenching response. Their limits of detection (LODs) for TNP were 7 ppb and 10 ppb, respectively with enhanced selectivity toward TNP (over other nitro explosives) as verified by competitive nitro explosive tests. Density functional theory calculations and spectral overlap were used to assess the sensing mechanism. These MOF-based fluorescent sensing systems for TNP are demonstrated to have easy recoverability and high sensitivity.


Assuntos
Substâncias Explosivas , Estruturas Metalorgânicas , Cádmio , Espectrometria de Fluorescência , Água , Hidrazonas , Aminas , Substâncias Explosivas/análise , Zinco/química
14.
J Environ Manage ; 325(Pt B): 116596, 2023 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-36326527

RESUMO

Diesel contamination of soil due to oil spills, disposal of refinery waste, oil exploration constitutes a major environmental problem. This paper reports the remediation of diesel contaminated clay soil using Zn/Fe0 bimetallic nanoparticle stabilized Rhamnolipid (RMLP) and Tween-80 (TW-80) surfactant foams. Fe0, and Zn (x wt%)/Fe0 (x = 0.2, 2.0, and 10.0) bimetallic nanoparticles are synthesized by using sodium borohydride reduction method. The average particle size (from FESEM) is calculated to be 62, 57, 42 and 35 nm for the Fe0, Zn (0.2)/Fe0, Zn (2)/Fe0 and Zn (10)/Fe0 nanopowders, respectively. The highest foamability and foam stability of 109.6 and 108.5 mL, respectively are observed for the RMLP (12 mg/l) surfactant foam stabilized with 6 mg/l Zn (10)/Fe0 nanoparticles. The surface tension values reduce to the lowest value of 28.1 and 31.4 mN/m with the addition of 6 mg/l of Zn (10)/Fe0 powder in RMLP and TW-80 solutions of 12 mg/l, respectively. The maximum diesel removal efficiency of 83.8 and 59%, is achieved by RMLP (12 mg/l) foam stabilized by Zn (10)/Fe0 nanoparticles (6 mg/l) for the clay soil contaminated with 100 and 500 µl/g of diesel, respectively. The physicochemical properties of the nanoparticles are studied to explain the foam properties and the remediation behavior. These findings regarding the nanoparticle stabilized foams can offer a cost-effective environment friendly commercial solution for soil remediation in the future.


Assuntos
Recuperação e Remediação Ambiental , Nanopartículas Metálicas , Poluentes do Solo , Solo/química , Argila , Polissorbatos , Poluentes do Solo/análise , Tensoativos , Nanopartículas Metálicas/química , Zinco
15.
J Colloid Interface Sci ; 630(Pt B): 341-351, 2023 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-36327736

RESUMO

The practicable technology for producing hydrogen energy was mainly photocatalytic water splitting. Recently, heterostructural photocatalysts have attracted much attention due to its unique band structures and interfacial interactions. Herein, plate-on-plate MoS2/Cd0.6Zn0.4S heterostructure was rationally designed and fabricated by a simple strategy. It was revealed that Zn-doping content in the Cd0.6Zn0.4S solid solution as well as the mass ratio of MoS2 in the MoS2/Cd0.6Zn0.4S heterostructure can significantly affect the photocatalytic hydrogen evolution reaction (HER) activity. Especially, when Zn doping content is 40 % and the mass ratio of MoS2 is approximately 0.8 % (0.8 % MoS2/Cd0.6Zn0.4S), it exhibits the highest hydrogen production (47.68 µmol·g-1 at 2.5 h) without sacrificial agents. When Na2S/Na2SO3 is employed as sacrificial agent, its HER activity reaches 13466.50 µmol·g-1·h-1, 1.3 folds higher than Cd0.6Zn0.4S. The boosted HER activity of the Z-scheme MoS2/Cd0.6Zn0.4S heterostructure was ascribed to the greatly improved separation efficiency of photogenerated carriers. Most importantly, studies have revealed that the existence of sacrificial agents (Na2S/Na2SO3) can not only accelerate the kinetics of oxidation half reaction, but also synchronously strengthen HER half-reactions. The present work reveals a facile strategy for construction of Z-scheme heterostructures for efficient hydrogen evolution via hole sacrificial agent synchronously strengthen half-reactions.


Assuntos
Compostos de Cádmio , Molibdênio , Molibdênio/química , Cádmio , Compostos de Cádmio/química , Hidrogênio/química , Zinco
16.
Braz. j. biol ; 83: e240015, 2023. tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1285624

RESUMO

Abstract Zinc is an essential micronutrient that is required for optimum plant growth. It is present in soil in insoluble forms. Bacterial solubilization of soil unavailable form of Zn into available form, is an emerging approach to alleviate the Zn deficiency for plants and human beings. Zinc solubilizing bacteria (ZSB) could be a substitute for chemical Zn fertilizer. The present study aimed to isolate and characterize bacterial species from the contaminated soil and evaluate their Zn solubilizing potential. Zn resistant bacteria were isolated and evaluated for their MIC against Zn. Among the 13 isolated bacterial strains ZSB13 showed maximum MIC value upto 30mM/L. The bacterial strain with the highest resistance against Zn was selected for further analysis. Molecular characterization of ZSB13 was performed by 16S rRNA gene amplification which confirmed it as Pseudomonas oleovorans. Zn solubilization was determined through plate assay and broth medium. Four insoluble salts (zinc oxide (ZnO), zinc carbonate (ZnCO3), zinc sulphite (ZnS) and zinc phosphate (Zn3(PO4)2) were used for solubilization assay. Our results shows 11 mm clear halo zone on agar plates amended with ZnO. Likewise, ZSB13 showed significant release of Zn in broth amended with ZnCO3 (17 and 16.8 ppm) and ZnO (18.2 ppm). Furthermore, Zn resistance genes czcD was also enriched in ZSB13. In our study, bacterial strain comprising Zn solubilization potential has been isolated that could be further used for the growth enhancement of crops.


Resumo O zinco é um micronutriente essencial necessário para o crescimento ideal das plantas. Ele está presente no solo em formas insolúveis. A solubilização bacteriana da forma indisponível de Zn no solo para a forma disponível é uma abordagem emergente para aliviar a deficiência de Zn em plantas e seres humanos. Bactérias solubilizadoras de zinco (ZSB) podem ser um substituto para fertilizantes químicos de Zn. O presente estudo teve como objetivo isolar e caracterizar espécies bacterianas de solo contaminado e avaliar seu potencial de solubilização de Zn. Bactérias resistentes ao Zn foram isoladas e avaliadas quanto ao seu MIC contra o Zn. Entre as 13 cepas bacterianas isoladas, ZSB13 apresentou valor máximo de MIC de até 30 mM/L. A cepa bacteriana com maior resistência ao Zn foi selecionada para análise posterior. A caracterização molecular de ZSB13 foi realizada por amplificação do gene 16S rRNA que o confirmou como Pseudomonas oleovorans. A solubilização do Zn foi determinada através de ensaio em placa e meio caldo. Quatro sais insolúveis (óxido de zinco (ZnO), carbonato de zinco (ZnCO3), sulfito de zinco (ZnS) e fosfato de zinco (Zn3 (PO4) 2) foram usados ​​para o ensaio de solubilização. Nossos resultados mostram uma zona de halo clara de 11 mm em placas de ágar corrigidas com ZnO. Da mesma forma, ZSB13 mostrou liberação significativa de Zn em caldo alterado com ZnCO3 (17 e 16,8 ppm) e ZnO (18,2 ppm). Além disso, os genes de resistência ao Zn czcD também foram enriquecidos em ZSB13. Em nosso estudo, a cepa bacteriana compreendendo potencial de solubilização de Zn foi isolada e poderia ser usada posteriormente para o aumento do crescimento de safras.


Assuntos
Humanos , Poluentes do Solo , Pseudomonas oleovorans , Solo , Microbiologia do Solo , Zinco , RNA Ribossômico 16S/genética
17.
J Colloid Interface Sci ; 629(Pt A): 276-286, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36081207

RESUMO

S-scheme heterojunction structure can endow the photocatalysts with high-performance photo-degradation of pharmaceuticals and personal care products (PPCPs) since it can remain the photogenerated electrons/holes with stronger redox ability. Herein, an integrative S-scheme heterojunction photocatalyst building from Cd0.5Zn0.5S nanoparticles and BiOCl microflowers with oxygen vacancies (OVs) was developed. Moreover, the in-situ grown process ensures the firm contact and intense electron coupling between BiOCl and Cd0.5Zn0.5S. As a result, Cd0.5Zn0.5S/BiOCl exhibited a significant reinforcement of photo-activity and stability for the abatement of antibiotic norfloxacin, manifesting a 2.8-fold or 9.6-fold enhancement compared to pristine Cd0.5Zn0.5S or BiOCl. Cd0.5Zn0.5S/BiOCl also shows good resistance to alkaline, sodium salts and humic acid. The performance of Cd0.5Zn0.5S/BiOCl to photocatalytically degrade other PPCPs with different molecular structures was further confirmed. At last, the ability of Cd0.5Zn0.5S/BiOCl for PPCPs de-toxicity was verified by evaluating the toxicity of norfloxacin and its degradation intermediate. This study demonstrates a new S-scheme heterojunction photocatalyt for efficient removal of PPCPs as well as provides some insights into developing high-performance metal sulfide solid-solution-based S-scheme heterojunctions for water decontamination.


Assuntos
Cádmio , Norfloxacino , Fotólise , Antibacterianos/farmacologia , Antibacterianos/química , Catálise , Oxigênio , Substâncias Húmicas , Sais , Luz , Zinco , Sulfetos , Água , Preparações Farmacêuticas , Sódio
18.
J Colloid Interface Sci ; 629(Pt A): 778-785, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36099845

RESUMO

Single-atom catalysts (SACs) have opened up unprecedented possibilities for expediting oxygen reduction reaction (ORR) kinetics owing to their ultrahigh intrinsic activities. However, precisely controlling over the atomically dispersed metal-Nx sites on carbon support while fulfilling the utmost utilization of metal atoms remain the key obstacles. Here, atomically distributed Co-N4 sites anchored on N-doped carbon nanofibers aerogel (Co SAs/NCNA) is controllably attained through a direct pyrolysis of metal-chelated cellulose nanofibers (TOCNFs-Cd2+/Co2+) hydrogel precursor. The usage of Cd salt assists the assembly of cross-linked aerogel, creates a large number of interior micropores and defects, and favors the physical isolation of Co atoms. The hierarchically porous biomass carbon aerogel (2265.1 m2/g) offers an advantageous platform to facilitate accessibility of the catalytic centers, also renders rapid mass diffusion and electron-transfer paths throughout its 3D architecture. Notably, Co SAs/NCNA affords a paramount ORR activity and respectable durability when integrated into zinc-air battery devices.


Assuntos
Nanofibras , Cobalto , Celulose , Carbono , Zinco , Cádmio , Hidrogéis , Oxigênio
19.
Food Chem ; 402: 134228, 2023 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-36130435

RESUMO

Considering the importance of rapid and effective detection of nitrite in food samples, herein, we report a multistep heterophase synthetic strategy for constructing crystalline-amorphous zinc/cobalt iron porous nanosheets (C-A Zn/Co-Fe PNSs) on carbon cloth. Notably, the C-A Zn/Co-Fe PNSs@CC electrochemical interface consists of interlaced carbon fibers with many uniformly distributed hybrid nanosheets containing crystalline-amorphous interfacial sites. This particular hybrid structure permits local enrichment of nitrite for enhanced nitrite capture efficiency, laying a solid foundation for the ultrasensitive detection of nitrite. In proof-of-concept experiments, we verified that C-A Zn/Co-Fe PNSs@CC could be used to analyze nitrite with good sensitivity and reproducibility. It is worth mentioning that an ultra-low LOD of 0.44 µM was obtained for the detection of nitrite. The designed electrochemical sensor worked well in complex samples such as sausages and tap water under optimal parameters.


Assuntos
Carbono , Nitritos , Fibra de Carbono , Reprodutibilidade dos Testes , Carbono/química , Cobalto/química , Água , Ferro/química , Zinco/química
20.
Food Chem ; 402: 134290, 2023 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-36148764

RESUMO

Sustainable strategies are essential for zinc (Zn) biofortification and cadmium (Cd) reduction in staple food crops. Herein, we evaluated the phytotoxicity of Glyzinc under foliar and root application (FA&RA) in a lab-scale experiment, and then investigated its Zn efficiency and Cd reduction through foliar application on wheat (Triticum aestivum L.) under field conditions. Compared to RA, FA of Glyzinc exhibited no adverse effect on wheat growth and oxidative stresses at all doses. In field conditions, FA of Glyzinc remarkably increased Zn (28.7 %), S (10.4 %), Cu (17.3 %) and crude protein (9.1 %) content in wheat grain at 100 mg/L without damaging wheat yield. Furthermore, FA of Glyzinc significantly reduced the grain phytic acid (PA) (23.7 %) and Cd level (19.5 %), as well as PA to Zn molar ratio (32.3 %). Overall, our results indicate that Glyzinc has great potential as a high-efficiency foliar fertilizer for Zn biofortification and safe crop production in nano-enabled agriculture.


Assuntos
Poluentes do Solo , Triticum , Triticum/metabolismo , Fertilizantes , Zinco/análise , Cádmio/análise , Biofortificação , Poluentes do Solo/análise , Solo , Ácido Fítico/metabolismo , Grão Comestível/química
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