Chemical contaminants

Fri, 06/26/2020 - 16:00
The high background value of cadmium (Cd) in the Panax notoginseng planting soil is the main reason for the Cd content in P. notoginseng exceeding the limit standards. The main goal of this study was to reveal the mechanism by which potassium (K) reduces Cd accumulation in P. notoginseng from the perspective of the influences of soil microbial communities on soil pH, total organic matter (TOM)...
Fri, 06/26/2020 - 14:05
The methods conventionally used for the extraction of organic pollutants in different environmental matrices are not suitable for measuring low concentrations of polycyclic aromatic hydrocarbons bioaccumulated in terrestrial snails that are both indicator of soil quality and a food item of various consumers including human being. A protocol, adapted from the QuEChERS method, originally designed...
Fri, 06/26/2020 - 08:02
by Mohd W. Azam, Amit Kumar, Asad U. Khan Antimicrobial resistance is becoming a growing health problem, which has become a challenge for the physicians to control infection and also an economic burden on the healthcare. This increase in resistance to the present antimicrobial agents led the researchers to find some alternative and more efficient drugs which can fight with the resistant...
Fri, 06/26/2020 - 06:12
Author(s): Ruifei Li, Pei Hua, Jin Zhang, Peter Krebs Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous and abundant in various media. Understanding the environmental behavior of PAHs in different compartments is essential for better evaluating and mitigating PAHs in the urban environment. Based on a 20-year monitoring dataset of PAHs in suspended particulate matter (SPM), this study...
Fri, 06/26/2020 - 06:10
Author(s): Mariana Morozesk, Lidiane S. Franqui, Fernanda C. Pinheiro, Joaquim A. Nóbrega, Diego S.T. Martinez, Marisa N. Fernandes Carbon nanotubes presence in the environment increases every year because of exponential industrial production around the world. In aquatic environments, carbon nanotubes can interact with other pollutants based on their adsorbent surface chemistry properties. Heavy...
Fri, 06/26/2020 - 00:00
Given the increasing antimicrobial resistance in urinary tract infections (UTI), alternative strategies need to be investigated. Determination of minimal inhibitory and bactericidal concentrations of essential oils from cajeput, lemongrass, tea tree, and thyme in artificial urine, revealed bactericidal activity of all four tested essential oils against seven uropathogenic species with values...
Thu, 06/25/2020 - 22:16
Acrylamide (AA), classified as a probable carcinogen, can be neurotoxic, genotoxic, and can damage DNA. This study explored the ability of seabuckthorn berries juice (SBJ) to alleviate AA‐induced toxic injury in rats. Twenty‐four adult male Sprague‐Dawley (SD) rats were randomly divided into four groups: control group, AA group (40 mg/kg), AA + SBJ (40 mg/kg AA and 5 mL/kg SBJ), and AA + vitamin...
Thu, 06/25/2020 - 22:15
The migration of eight trace elements (Fe, Sn, Cr, Cd, Pb, Ni, Cu, and Zn) was monitored for fruits canned in uncoated tinplate cans under different storage conditions until the shelf life. The levels of most of these elements significantly increased with storage time and were also affected by storage temperature. Particularly, storage at 40°C (simulating sunlight exposure of the cans) caused...
Thu, 06/25/2020 - 22:15
Antioxidant and anti‐proliferative activities of M. laevigeta leaf and bark extract were determined against EAC cells in the peritoneum fluid of Swiss albino mice. Morphological alteration of the treated EAC cells on florescence microscope and DNA degradation in gel electrophoresis confirmed the apoptosis induction. The Expression pattern of the Bax, Bcl‐2 and PARP‐1 in comparison to control...
Thu, 06/25/2020 - 16:00
Meiotic recombination ensures accurate homologous chromosome segregation during meiosis and generates novel allelic combinations among gametes. During meiosis, DNA double strand breaks (DSBs) are generated to facilitate recombination. To maintain genome integrity, meiotic DSBs must be repaired using appropriate DNA templates. Although the DNA damage response protein kinase Ataxia-telangiectasia...
Thu, 06/25/2020 - 16:00
In the present study, we conducted field surveys to detect the population density of the most important invasive weed species and their associated virus vectoring aphids in crops grown under high input field (HIF) vs. low-input field (LIF) conditions, with and without fertilizers and pesticides. The most frequent invasive weed species were annual fleabane, Erigeron annua (L.), Canadian horseweed...
Thu, 06/25/2020 - 16:00
Nitrile hydratases have received significant interest both in the large-scale industrial production of acrylamide and nicotinamide, and the remediation of environmental contamination with nitrile-containing pollutants. Almost all known nitrile hydratases include an α-subunit (AnhA) and β-subunit (AnhB), and a specific activator protein is crucial for their maturation and catalytic activity. Many...
Thu, 06/25/2020 - 06:13
Author(s): Zhengxin Xie, Ying Gan, Jun Tang, Shisuo Fan, Xiangwei Wu, Xuede Li, Haomiao Cheng, Jie Tang The nonsteroidal anti-inflammatory drug diclofenac (DCF) is considered a contaminant of emerging concern. DCF can co-exist with heavy metals in aquatic environments, causing unexpected risks to aquatic organisms. This study aimed to assess the combined effects of DCF and cadmium (Cd) at...
Wed, 06/24/2020 - 22:12
Peppers are rich in health‐promoting phytochemicals, which are involved in the defense mechanisms against cancer. To select a lead variety of pepper with anti‐proliferative activity against colon cancer cells and liver cancer cells, high antioxidant activity, and high concentrations of capsaicin, flavonoids, and phenolics, we compared these attributes in nine different pepper accessions belonging...
Wed, 06/24/2020 - 10:02
Rifampin is the first-line antituberculosis drug, with Mycobacterium tuberculosis RNA polymerase as the molecular target. Unfortunately, M. tuberculosis strains that are resistant to rifampin have been identified in clinical settings, which limits its therapeutic effects. In clinical isolates, S531L and D516V (in Escherichia coli) are two common mutated codons in the gene rpoB, corresponding to...
Wed, 06/24/2020 - 10:02
Ceftazidime-avibactam and cefiderocol are two of the latest generation β-lactam agents that possess expanded activity against highly drug-resistant bacteria, including carbapenem-resistant Enterobacterales. Here, we show that structural changes in AmpC β-lactamases can confer reduced susceptibility to both agents. A multidrug-resistant Enterobacter cloacae clinical strain (Ent385) was...
Wed, 06/24/2020 - 06:09
Author(s): Long Cang, Jinfeng Xing, Cun Liu, Yujun Wang, Dongmei Zhou Chemical immobilization of heavy metals is a simple, low-cost, and environment-friendly technology for remediation of heavy metals contaminated soils. However, changes in environmental conditions, such as water management, acid deposition, temperature fluctuation, etc., might result in release of metal ions from the fixation...
Wed, 06/24/2020 - 02:03
The distribution, seasonal variation and sources of 16 polycyclic aromatic hydrocarbons (PAH) from suspended particulate matter (SPM) of the Aurá River, a small amazon typical river located in Northern Brazil, were determined. Gas chromatography–mass spectrometry analysis of SPM revealed a mixture of PAH from different origins and a seasonal variation of PAH primary source for the studied area....
Tue, 06/23/2020 - 22:15
Terpene glycosides (TGs) in the berry skins of Ecolly and Cabernet Gernischet (CG) grapes were profiled by ultra performance liquid chromatography‐quadrupole time‐of‐flight mass spectrometry (UPLC‐Q‐TOF‐MS) and compared to that of Muscat Hamburg (MH) grapes. The aroma glycosides in grape skins were extracted by methanol, purified using Amberlite XAD‐2 resins, eluted in methanol/ethyl acetate, and...
Tue, 06/23/2020 - 22:15
Battered and breaded fish nuggets (BBFNs) were prepared by treating fish with a batter composed of wheat starch (WS) and wheat protein (WP) blends (at the ratios of 15:1, 13:1, 11:1, 9:1, and 7:1, w/w), frying at 170 °C (40 s) followed by 190 °C (30 s). Fried BBFNs were evaluated for moisture and fat contents, color, shrinkage, acrylamide content, and fat distribution. Results showed that...
Tue, 06/23/2020 - 18:02
In this paper, we report leaching of precious and scattered metals such as gold (Au), copper (Cu), nickel (Ni), zinc (Zn), iron (Fe), and lead (Pb) from printed circuit boards of scrap mobile phones by hydrometallurgical process using inorganic acid, organic acid and base. The amount of metals leached by different leachants are quantified using atomic absorption spectroscopy. Among various...
Tue, 06/23/2020 - 16:00
Mobile genetic elements, including plasmids, drive the evolution of prokaryotic genomes through the horizontal transfer of genes allowing genetic exchange between bacteria. Moreover, plasmids carry accessory genes, which encode functions that may offer an advantage to the host. Thus, it is expected that in a certain ecological niche, plasmids are enriched in accessory functions, which are...
Tue, 06/23/2020 - 14:05
This study was carried out to assess the exposure to pesticide residues from vegetable consumption of residents in Seoul using data on pesticide residue concentrations and the quantity of vegetables consumed. A total of 34,520 samples of 96 types of vegetables collected from 2010 to 2014 by the Seoul Metropolitan Government Institute of Health and Environment (SIHE) were analysed for 283...
Tue, 06/23/2020 - 08:02
by Elspeth Ready, Patrick Habecker, Roberto Abadie, Bilal Khan, Kirk Dombrowski We analyze a network of needle-sharing ties among 117 people who inject drugs (PWID) in rural Puerto Rico, using exponential random graph modeling to examine whether network members engage in partner restriction to lower their risk of contracting HIV or hepatitis C (HCV), or in informed altruism to prevent others from...
Tue, 06/23/2020 - 02:02
Surfactants are substances applicable in the removal of heavy metals from contaminated soil. This study aims to investigate the effects of surfactant mixtures, composed of nonionic, anionic, and cationic surfactants, on the removal efficiency of Cd and Zn by mixture design (MD). Central composite rotatable design (CCRD) was integrated to optimize the conditions of contaminated soil washing....
Mon, 06/22/2020 - 22:12
BACKGROUND Central kitchen is a new trend in food industry where centralized preparation and processing of fresh foods as well as distribution of finished or semi‐finished products to catering chains or related units take place. Fresh foods processed by a central kitchen mainly include fruit and vegetables, meat, aquatic products and edible fungi; these foods have high water activities and...
Mon, 06/22/2020 - 06:11
Author(s): Yamdeu Joseph Hubert Galani, Michael Houbraken, Abukari Wumbei, Joseph Fovo Djeugap, Daniel Fotio, Yun Yun Gong, Pieter Spanoghe This study monitored 81 pesticides residues in 160 samples of 11 dry agricultural products collected in the 3 largest cities of Cameroon, extracted using QuEChERS method and analysed by liquid chromatography tandem mass spectrometry (LC-MS/MS). Residues of 58...
Sun, 06/21/2020 - 02:03
The acrylamide content and color formation (CIE L*, a* and b*) of hazelnuts which processed at different roasting temperatures of 130 °C, 150 °C, 160 °C and 170 °C with roasting time for 15 and 30 min were evaluated. Acrylamide contents of roasted hazelnuts were measured by means of Ultra Performance Liquid Chromatography (UPLC). Acrylamide formation of roasted hazelnuts was undetectable and...
Sun, 06/21/2020 - 02:03
The growth response, tolerance, and enrichment characteristics of six ornamental species, Chlorophytum comosum, Calendula officinalis, Iris lacteal, Belamcanda chinensis, Saponaria officinalis, and Polygonum lapathifolium were studied under hydroponic culture with lead (Pb) concentrations ranging from 0 to 1000 mg/L. The results showed that the growth of the tested ornamental species under Pb...
Sat, 06/20/2020 - 08:02
by Emily E. Lynch, Helen C. S. Meier Environmental conditions that contribute to childhood lead exposure are spatially patterned. Socioeconomic and racial inequities in childhood lead exposure have been well documented, however childhood lead exposure in Milwaukee is understudied. As a segregated rustbelt metropolitan area with childhood lead exposure concerns, Milwaukee is uniquely positioned to...
Sat, 06/20/2020 - 06:11
Author(s): Hemily Batista-Silva, Keyla Rodrigues, Kieiv Resende Sousa de Moura, Glen Van Der Kraak, Christelle Delalande-Lecapitaine, Fátima Regina Mena Barreto Silva This study investigated the acute in vitro effect of low-concentration bisphenol A (BPA) on calcium (45Ca2+) influx in zebrafish (Danio rerio) testis and examined whether intracellular Ca2+ was involved in the effects of BPA on...
Sat, 06/20/2020 - 02:02
The effects of atmospheric precipitation on heavy metal accumulation and deactivation amendment in wheat surrounding a lead smelter were studied. The total precipitation amounts of Cd, Pb, and As in an in situ test were noticeably more than their amounts in an off-site test over the entire growing period of wheat. In the same soil-wheat system, the heavy metal concentrations of wheat leaves in...
Fri, 06/19/2020 - 22:13
Wetlands are common sites of active Hg methylation by anaerobic microbes; however, the amount of methylmercury produced varies greatly, as Hg methylation is dependent upon both the availability of Hg and the composition and activity of the microbial community involved. In this study, we identified the major microbial guilds responsible for Hg methylation along a trophic gradient composed of two...
Fri, 06/19/2020 - 16:00
Progressive pollution due to toxic metals significantly undermines global environmental sustainability efforts. Chromium (Cr) is one of the most dangerous to human health. The use of plants to rid the environment of such pollutants “phytoremediation” proves to be a promising alternative to the current remediation methods. In the present study, inductively coupled plasma optical emission...
Fri, 06/19/2020 - 16:00
Corn (Zea mays L.) is not only an important food source, but also has numerous uses, including for biofuels, fillers for cosmetics, glues, and so on. The amount of corn grown in the U.S. has significantly increased since the 1960’s and with it, the demand for synthetic fertilizers and pesticides/fungicides to enhance its production. However, the downside of the continuous use of these products,...
Fri, 06/19/2020 - 08:02
In recent years, pesticide residues in food have increasingly become the focus of public attention. However, the standard system of pesticide maximum residue limits in fermented food is imperfect, which can lead to potential safety risks to consumers. In this context, the aim of the study was to assess the potential effects of paclobutrazol residue on the yogurt fermentation process. We examined...
Fri, 06/19/2020 - 04:04
Cocoa and chocolate can contain cadmium (Cd) and lead (Pb) from natural and anthropogenic sources. This perspective provides background on the origin, occurrence, and factors affecting Cd and Pb levels in chocolate products as well as ongoing international efforts to mitigate Cd and Pb in these popular foods, particularly the higher Cd levels observed in some cocoa and chocolate originating from...
Fri, 06/19/2020 - 02:02
The mining sector has great importance to the economic activity in Brazil. However, it is also responsible for several environmental impacts such as the rupture of the Fundão dam (Mariana, Brazil) that resulted in the spillage of 50 million m3 of mining tailings in the Doce River Basin. This study evaluated the acute and chronic effects of Fundão tailings on growth, development, respiration rates...
Thu, 06/18/2020 - 06:11
Author(s): Hongbiao Cui, Lulu Shen, Xiong Yang, Shiwen Zhang, Qitao Yi, Lin Meng, Xuebo Zheng, Qiuya Wang, Jun Zhou Iron (Fe) oxides are intimately coupled with phosphorus and closely associated with the bioavailability of potential toxic elements (PTEs) in soil. Thus, Fe oxides may influence the stabilization of PTEs in contaminated soils amended by phosphorus. To evaluate the effects of...
Thu, 06/18/2020 - 04:04
An analytical program for multiclass, multiresidue residue analysis to qualitatively and quantitatively determine veterinary drug compounds in game meats by LC-MS/MS has been developed and validated. The method was validated for the analysis of muscle from bison, deer, elk, and rabbit to test for 112 veterinary drug residues from the following drug classes: β-agonists, anthelmintics, anti-...
Thu, 06/18/2020 - 02:03
A bulky waste, oyster shell (OS), was calcinated at 400–800°C to produce Ca-rich products (OS400–OS800) to reduce the human health risk of soil cadmium (Cd) and arsenic (As). Thermogravimetric analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET method were used to characterize OS and its calcined products. OS and OS400–OS700 removed little Cd and As from water, whereas...
Thu, 06/18/2020 - 02:03
The concentrations of zinc, copper, lead and cadmium owing to vehicles were analyzed in roadside soils during all the four seasons from Faisalabad-Gojra road (M-4) and Gojra-Jhang road (GJR) in the Punjab, Pakistan. Results indicated that all the polluted sites along the roadside had comparatively higher metal concentrations as compared to control, nevertheless, spatio-temporal variations in...
Thu, 06/18/2020 - 02:02
A selective and reliable method was developed and validated for the determination of 14 lipophilic pesticides in raw propolis by gas chromatography–tandem mass spectrometry (GC-MS/MS) analysis. A test portion of milled sample was extracted with n-hexane followed by back extraction with acetonitrile and cleanup using EMR-Lipid and Florisil column adsorption. Matrix-matched standards were used to...
Thu, 06/18/2020 - 02:02
In spite of the fact that pesticides enhanced the quality and yield of the agricultural production however do have certain serious effects on the environment. This study was carried out for isolation and molecular identification of microorganisms from water for malathion biodegradation in aquatic system. PCR analysis was used for identification of the isolated fungus. The growth kinetics of A....
Wed, 06/17/2020 - 22:17
Even though antimicrobial‐resistant bacteria have begun to be detected in wildlife, raising important issues related to their transmission and persistence of clinically important pathogens in the environment, little is known about the role of these bacteria on wildlife health, especially on endangered species. The Brazilian merganser (Mergus octosetaceus) is one of the most threatened waterfowl...
Wed, 06/17/2020 - 22:15
A novel, facile, and robust strategy was proposed to increase the pore size and mechanical strength of cryogels. By mixing the monomers of acrylamide and 2‐hydroxyethyl methacrylate as the precursor, a monolithic copolymer cryogel with large interconnected pores and thick pore walls was prepared. Hydrogen bonding between the two monomers contributed to the entanglement and aggregation of the...
Wed, 06/17/2020 - 06:09
Author(s): Hyuck Soo Kim, Byoung-Hwan Seo, Gary Owens, Young-Nam Kim, Jae-Hwang Lee, Mina Lee, Kwon-Rae Kim The phytoavailability of heavy metals in soils is important for both food safety and environmental management. Hence soil metal phytoavailability threshold values need to be established based on a firm scientific basis. In this study, optimal Cd phytoavailability threshold values, were...
Wed, 06/17/2020 - 02:02
Due to high toxicity to mammals and hazard to the ecosystem, parathion has been banned or limited for use in many countries. It is essential to ensure food safety by parathion suspecting. On-site testing, as a critical component of the food chain safe system, plays a major role in the protection of food safety and human health. In this study, based on monoclonal antibody (Mab), a rapid and...
Tue, 06/16/2020 - 22:15
Pesticide residue and saponin content are two important factors affecting the quality of ginseng products. In this paper, the effects of four new drying processing technologies on pesticide residues and saponins in ginseng were studied. The change in pesticide residue was determined by GC and the content of ginsenoside was determined by HPLC. After the microwave treatment for 32 min, the...

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