Chemical contaminants

Sat, 06/19/2021 - 12:01
ABSTRACT Douglas Channel and the adjacent Hecate Strait (British Columbia, Canada) are part of a proposed route to ship diluted bitumen (dilbit). This study presents how two types of dilbit naturally degrade in this environment by using an in situ microcosm design based on dilbit-coated beads. We show that dilbit-associated n-alkanes were microbially biodegraded with estimated half-lives of 57–...
Sat, 06/19/2021 - 06:32
Author(s): Muyang Li, Wei Liu, Wenqiu Liu, Mengyan Bi, Zhaojie Cui
Sat, 06/19/2021 - 06:27
Author(s): He Yu, Miao Wang, Jing Cao, Yongxin She, Yongan Zhu, Jiaming Ye, A.M. Abd El-Aty, Ahmet Hacımüftüoğlu, Jing Wang, Shuibing Lao
Sat, 06/19/2021 - 06:26
Author(s): Jiaqing Feng, Juanjuan Feng, Herman Maloko Loussala, Sen Han, Xiangping Ji, Chunying Li, Haili Sun, Min Sun
Fri, 06/18/2021 - 18:04
Dredged sediments display a great potential for growing media applications; however, there are few studies about their beneficial reuse for the waste storage reclamation. This research study aims at checking the agronomic values and environmental impacts of three growing media based on waterways sediments (WSs) and green waste (GW) according ecolabel requirements. For this purpose, three growing...
Fri, 06/18/2021 - 18:04
To reduce waste volumes and recover valuable products, char was synthesized via co-pyrolysis of rice straw (RS) with spent tires, sulfur wastes, and CO2. The inclusion of wastes and CO2 in pyrolysis of RS was hypothesized to enhance the sorption ability of char for various contaminants, including 2,4-dinitrotoluene (DNT), 2,4-dichlorophenol (DCP), lead, barium, chromate (CrO42−), and selenate (...
Fri, 06/18/2021 - 06:10
Author(s): Na Li, Hang Kang, Zhen Peng, Hua-feng Wang, Shi-qi Weng, Xu-hui Zeng
Fri, 06/18/2021 - 02:03
The indiscriminate use of glyphosate is one of the main agricultural practices to combat weeds and grasses; however, its incorrect application increases soil and water contamination caused by the product. This situation is even more critical due to its great versatility for use in different cultivars and at lower prices, making it the most used pesticide in the world. Nevertheless, there is still...
Thu, 06/17/2021 - 06:29
Author(s): Xianli Wang, Qicai Zhang, Zhiyong Zhao, Weiguo Song, Lin Cheng, Junhua Yang, Shanshan Chen, Shuhui Guan, Wei Song, Qinxiong Rao, Zhihui Zhao
Thu, 06/17/2021 - 04:03
In this study, the rhodamine 6G hydrazide (R6GH) complex was synthesized to develop an “off–on” output platform for fluorescence and visual dual-mode analysis of lead(II) (Pb2+). The prepared R6GH complex using the heat to reflux reaction of rhodamine 6G (R6G) and hydrazine hydrate was characterized through FT-IR, MS, 1H NMR, and 13C NMR and demonstrated to have good fluorescence stability and...
Thu, 06/17/2021 - 02:03
The species composition of eight shrub communities were investigated in order to understand the species diversity of plant communities in buffer zone and wetland of Momianhe stream along a long-term mine waste area, Lanping county, Yunnan province, China. Dominant plant species and soil samples were collected to analysis heavy metal (Cu, Zn, Pb and Cd) accumulation characteristics. The results...
Thu, 06/17/2021 - 02:02
Polycyclic aromatic hydrocarbons (PAHs) and mercury were investigated in smoked catfish illegally sold and confiscated by Italian authorities in Turin (North-western Italy). The mean benzo(a)pyrene (BaP) concentration was 73 ± 11 μg kg−1 and the total mean PAH concentration (ΣPAH) was 243 ± 38 μg kg−1, both exceeding the EU maximum limits (2.0 and 12 μg/kg) set in muscle of smoked fish and...
Wed, 06/16/2021 - 18:03
Cadmium (Cd) is a heavy metal that is widely present in modern industrial production. It is a known, highly toxic environmental endocrine disruptor. Long-term exposure to Cd can cause varying degrees of damage to the liver, kidney, and reproductive system of organisms, especially the male reproductive system. This study aimed to explore the mechanism of Cd toxicity in the male reproductive system...
Wed, 06/16/2021 - 18:03
Despite the ban of polychlorinated biphenyls (PCBs) some decades ago, concerns regarding their adverse health effects are continuing, because the workers employed for installation and repair of electrical equipment may be still exposed to PCBs. This study aimed to assess serum PCBs levels in workers in different industries. To do this, we determined the serum concentrations of 9 non-dioxin-like...
Wed, 06/16/2021 - 08:04
EARTH, ATMOSPHERIC, AND PLANETARY SCIENCES Rosette system for trace metal clean sampling of seawater with Canadian team members during a 2015 Arctic cruise. Image credit: Kathryn Purdon (University of Victoria, Victoria, Canada). Sources of lead in the western Arctic Ocean Anthropogenic lead contamination is widespread in the natural environment. However,...
Wed, 06/16/2021 - 08:04
Organic–inorganic layered perovskites, or Ruddlesden–Popper perovskites, are two-dimensional quantum wells with layers of lead-halide octahedra stacked between organic ligand barriers. The combination of their dielectric confinement and ionic sublattice results in excitonic excitations with substantial binding energies that are strongly coupled to the surrounding soft, polar lattice. However, the...
Wed, 06/16/2021 - 02:02
At present, the detection of chlorothalonil is generally based on chromatography and immunoassay; both of which are time-consuming and costly. In this study, Surface-enhanced Raman Spectroscopy (SERS) has been successfully utilized in the detection of chlorothalonil coupled with photochemistry and meanwhile, gold nanoparticles were prepared to enhance the Raman signal. Two Raman peaks (2246 cm− 1...
Tue, 06/15/2021 - 16:00
Phytochelatins (PCs) play important roles in the detoxification of and tolerance to heavy metals in plants. The synthesis of PCs is catalyzed by phytochelatin synthase (PCS), which is activated by heavy metal ions. In this study, we isolated a PCS gene, BnPCS1, from the bast fiber crop ramie (Boehmeria nivea) using the RACE (rapid amplification of cDNA ends) method. The full-length BnPCS1 cDNA is...
Tue, 06/15/2021 - 16:00
The chemical profile of Thymus proximus essential oil (EO) and its allelopathic, phytotoxic, and insecticidal activity was evaluated. Carvacrol, p-cymene, and γ-terpinene were detected as the major components of the EO, representing 85.9% of the total oil. About 50 g fresh plant material of T. proximus in a 1.5-L air tight container completely inhibited the seed germination of Amaranthus...
Tue, 06/15/2021 - 16:00
Antibiotic bacterial residue is a unique hazardous waste, and its safe and effective disposal has always been a concern of pharmaceutical enterprises. This report presents the effective treatment of hazardous waste—antibiotic bacterial residue—by black soldier fly larvae (larvae), oxytetracycline bacterial residue (OBR), and soya meal with mass ratios of 0:1 (soya), 1:20 (OBRlow), and 1:2 (...
Tue, 06/15/2021 - 08:05
Anthropogenic Pb is widespread in the environment including remote places. However, its presence in Canadian Arctic seawater is thought to be negligible based on low dissolved Pb (dPb) concentrations and proxy data. Here, we measured dPb isotopes in Arctic seawater with very low dPb concentrations (average ∼5 pmol ⋅ kg−1) and show that anthropogenic Pb is pervasive and often dominant in the...
Tue, 06/15/2021 - 08:05
Pesticides are chemicals used in agriculture to protect crops from pests. In addition to protection during cultivation, they are also used after harvesting to extend the shelf life of products. Postharvest control stands out, especially when it comes to products imported from distant countries, resulting in increased concentration of pesticides and risk to human health consuming such products. In...
Tue, 06/15/2021 - 02:03
In order to determine the ecological risk and health risk of Arsenic (As) and Cadmium (Cd) in soils from a typical mining city in Huainan, a total of 99 soil samples were collected and analyzed. The results showed that the concentrations of As and Cd ranged from 3.2 to 39.50 and 0.01 to 0.19 mg/kg, respectively, which exceeded the soil background values by 6.06 and 14.14%, respectively. The soil...
Mon, 06/14/2021 - 08:03
The effects of curcumin on the bioavailability of polychlorinated dibenzo-p-dioxins/furans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (DL-PCBs) were investigated in Sprague–Dawley rats. Tetra- and penta-chlorinated PCDFs had the lowest bioavailability and hexa-chlorinated PCDD/Fs had the highest, while there was no obvious change in that of DL-PCBs. Curcumin markedly reduced the toxic...
Sun, 06/13/2021 - 06:10
Author(s): Ornicha Champrasert, Jin Chu, Qi Meng, Sara Viney, Melvin Holmes, Prisana Suwannaporn, Caroline Orfila The inhibitory effect of three polysaccharides (alginate, pectin and chitosan) on acrylamide formation was investigated in chemical and fried potato food model systems, under two heating regimes (heating block and microwave). In the chemical system, acrylamide formation followed a...
Sun, 06/13/2021 - 04:03
A new microfluidic approach using hybrid magnetoliposomes (h-MLs) containing hydrophobic magnetic nanoparticles (Fe3O4@AuNPs-C12SH) and encapsulated N-acetylcysteine has been developed in this research to determine aminoglycoside antibiotic (AAG) residues in food using o-phthalaldehyde. Four AAGs, kanamycin, streptomycin, gentamicin, and neomycin, have been used as model analytes. The h-MLs have...
Sat, 06/12/2021 - 06:28
Author(s): Qin Wu, Muhammad Abu Bakr Shabbir, Dapeng Peng, Zonghui Yuan, Yulian Wang This present study was designed to develop a novel microbiological inhibition-based method for the rapid screening and identification of antibiotic residues in milk, chicken egg and honey. Geobacillus stearothermophilus C953 was used as test bacterium in the detection system of this study. The optimization of...
Sat, 06/12/2021 - 04:02
Bottled tea beverages (BTB) are popular for the benefits to human health and convenience. Because Chlorpyrifos (CP) is commonly used as a biomarker for exposure as well as a pesticide in the field, it is important to determine the dynamics of CP dissipation in BTB in order to better perform risk assessments. This study focused on the dynamic behavior of CP for 22 days by fortifying bottled green...
Fri, 06/11/2021 - 06:14
Author(s): Yanluo Xie, Nan He, Mingyang Wei, Tingyao Wen, Xitong Wang, Huakang Liu, Shiqiang Zhong, Heng Xu Cadmium (Cd)-remediation by microorganisms has been frequently used due to environmental friendliness, low cost and easy operation. However, the mechanisms of bio-remediation were not clear enough. Hence, a strain KC6, identified as Bacillus subtilis, was isolated from the metal...
Fri, 06/11/2021 - 06:12
Author(s): Shao-Shuai Bi, Hai-Yao Jin, Milton Talukder, Jing Ge, Cong Zhang, Mei-Wei Lv, Mamoon Ali Yaqoob Ismail, Jin-Long Li Cadmium (Cd) is one of the toxic environmental heavy metals that poses health hazard to animal due to its toxicity. Nano-Selenium (Nano-Se) is a Nano-composite form of Se, which has emerged as promising therapeutic agent for its protective roles against heavy metals-...
Fri, 06/11/2021 - 06:11
Author(s): Serena Santonicola, Stefania Albrizio, Maria Carmela Ferrante, Mercogliano Raffaelina The occurrence of analogues of bisphenol A (BPA), including bisphenol F(BPF) in milk is still not well known. BPF may enter the milk chain at the farm and during milk processing at the dairy company. This study identified the main BPF contamination pathways using a monitoring model based on the...
Fri, 06/11/2021 - 04:04
Existing methods for the analysis of pesticides in human breast milk involve multiple extraction steps requiring large sample and solvent volumes, which can be a major obstacle in large epidemiologic studies. Here, we developed a simple, low-volume method for extracting organophosphates, pyrethroids, carbamates, atrazine, and imidacloprid from 100 to 200 μL of human breast milk. Multiple...
Fri, 06/11/2021 - 04:04
Pollution related to pesticides has become a global problem due to their low utilization and non-targeting application, and nanotechnology has shown great potential in promoting sustainable agriculture. Nowadays, mesoporous silica-based nanomaterials have garnered immense attention for improving the efficacy and safety of pesticides due to their distinctive advantages of low toxicity, high...
Fri, 06/11/2021 - 02:03
Polychlorinated biphenyls (PCBs) are a group of highly toxic endocrine-disrupting chemicals comprising 209 homologs. PCBs are extensively found in the environment and can induce typical estrogenic and profound, long-lasting effects on animals. In this article, the introduction of PCB residues into the environment and the pathways of PCB enrichment in animals are described. PCBs are widely...
Fri, 06/11/2021 - 02:03
The combined pollution of arsenic (As) and cadmium (Cd) are quite common in the polymetallic mining areas located in southern China. In the present study, field experiments were established for the purpose of exploring a simultaneous remediation strategy of rice variety-water management-contaminant immobilization on the As and Cd contamination in paddy soil. The obtained results revealed that the...
Fri, 06/11/2021 - 02:03
Cadmium (Cd), a toxic heavy metal, is harmful to plants and human health. Glutathione (GSH) could alleviate Cd toxicity of plant species, whereas its mechanism responsible for wheat remains poorly understood. Here, we found that exogenous GSH application significantly increased the fresh and dry weight, root elongation, chlorophyll contents, while decreased the contents of malondialdehyde (MDA)...
Fri, 06/11/2021 - 00:00
Microbial infections are a major public health concern. Antimicrobial peptides (AMPs) have been demonstrated to be a plausible alternative to the current arsenal of drugs that has become inefficient due to multidrug resistance. Herein we describe a new AMP family, namely the super-cationic peptide dendrimers (SCPDs). Although all members of the series exert some antibacterial activity, we propose...
Fri, 06/11/2021 - 00:00
Malaria and human African trypanosomiasis (HAT; sleeping sickness) are life-threatening tropical diseases caused by protozoan parasites. Due to limited therapeutic options, there is a compelling need for new antiprotozoal agents. In a previous study, O-tigloylcyclovirobuxeine-B was recovered from a B. sempervirens L. (common box; Buxaceae) leaf extract by bioactivity-guided isolation. This nor-...
Thu, 06/10/2021 - 16:00
UDP glucose pyrophosphorylase (UDPGP) family genes have been reported to play essential roles in cell death or individual survival. However, a systematic analysis on UDPGP gene family has not been performed yet. In this study, a total of 454 UDPGP proteins from 76 different species were analyzed. The analyses of the phylogenetic tree and orthogroups divided UDPGPs into three clades, including UDP...
Thu, 06/10/2021 - 16:00
Bacterial biofilms play a key role in metal biosorption from wastewater. Recently, Enterobacter asburiae ENSD102, Enterobacter ludwigii ENSH201, Vitreoscilla sp. ENSG301, Acinetobacter lwoffii ENSG302, and Bacillus thuringiensis ENSW401 were shown to form air–liquid (AL) and solid–air–liquid (SAL) biofilms in a static condition at 28 and 37°C, respectively. However, how environmental and...
Thu, 06/10/2021 - 06:24
Author(s): Mohamad I. Abou Zeid, Mireille Kallassy Awad, Khalil C. Melki, Yusuf Abou Jawdah, Adla M. Jammoul Loquat in Lebanon is subjected to sprays by a variety of unregistered pesticides, as is the case with minor crops in many parts of the world, to protect it from pests mainly scab. This malpractice would raise consumer’s health safety issues related to pesticides residues that could be...
Thu, 06/10/2021 - 06:21
Author(s): Chenhong Yu, Li Li, Yaping Ding, Huajie Liu, Hanyue Cui, Fenfen Zhang, Jiaxin Lin, Yingchun Duan An electrochemical aptamer sensor based on gold nanoparticles (AuNPs) was developed for highly specific sensing of melamine (MEL), which combines molecularly imprinted polymers (MIPs) and aptamers. AuNPs were synthesized by simple reduction of sodium citrate and characterized by...
Thu, 06/10/2021 - 06:20
Author(s): L. Smeesters, I. Magnus, M. Virte, H. Thienpont, W. Meulebroeck Acrylamide formation is nowadays one of the major concerns of the potato-processing agriculture industry. We investigate the use of broadband reflection spectroscopy (400 – 1700 nm), in combination with machine learning, to optically classify raw potatoes inducing different levels of acrylamide after frying, covering...
Thu, 06/10/2021 - 06:19
Author(s): Mohammad Faizan, Javaid Akhter Bhat, Kamel Hessini, Fangyuan Yu, Parvaiz Ahmad Cadmium (Cd) is a trace element causing severe toxicity symptoms in plants, besides posing hazardous fitness issue due to its buildup in the human body through food chain. Nanoparticles (NPs) are recently employed as a novel strategy to directly ameliorate the Cd stress and acted as nano-fertilizers. The...
Thu, 06/10/2021 - 02:02
The long-term accumulation of pesticide residues brought a huge threat to healthy lives of animals and humans. However, traditional detection methods for pesticide residues required expensive equipment and tedious operation. An electrochemiluminescence (ECL) aptasensor based on nano-antimony tin oxide and titanium dioxide composites (ATO@TiO2) and silver nanoparticles (AgNPs) for rapid detection...
Wed, 06/09/2021 - 16:00
ObjectivesMethylmercury metabolism was investigated in Pacific walruses (Odobenus rosmarus divergens) from St. Lawrence Island, Alaska, United States.MethodsTotal mercury and methylmercury concentrations were measured in fecal samples and paired colon samples (n = 16 walruses). Gut microbiota composition and diversity were determined using 16S rRNA gene sequencing. Associations between fecal and...
Wed, 06/09/2021 - 06:10
Author(s): Tengkai Wang, Fen Xu, Lijun Song, Juan Li, Qian Wang Previous studies have suggested that bisphenol A (BPA) has a toxic effect on bone development; however, its pathological mechanism has not been fully elucidated. In the present study, pregnant Wistar rats were intragastrically administered BPA (10 μg/kg per day) during gestational days 14–21. Then, bone tissues were obtained from...
Wed, 06/09/2021 - 06:09
Author(s): Marta Mesias, Cristina Delgado-Andrade, Francisca Holgado, Lucía González-Mulero, Francisco J. Morales Two observational tests were designed to investigate the influence of consumer decisions during the preparation of French fries from fresh potatoes on acrylamide formation. In both tests, color was of paramount importance to volunteers with regards to the decision to stop the frying...
Wed, 06/09/2021 - 04:06
Lanthanum (La), calcium (Ca), and cadmium (Cd) have similar physical and chemical properties because of their similar ionic radius. Although the interactions between La, Ca, and Cd have been frequently reported in plants, few studies have investigated the interactive effects of La and Ca on the growth and Cd accumulation in plants. Therefore, we investigated the interactive effects of La and Ca...

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