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Ecotoxicology and Environmental Safety

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https://read.qxmd.com/read/30999185/chronic-exposure-to-green-light-aggravates-high-fat-diet-induced-obesity-and-metabolic-disorders-in-male-mice
#1
Shiyao Zhang, Yanchen Zhang, Wenxiang Zhang, Siyu Chen, Chang Liu
Light is involved in many critical physiological or biochemical processes of human beings, such as visual sensing and the production of vitamin D. Recent studies have showed that the lights of different wavelengths have a profound influence in life activities. For example, blue light promotes alertness, whereas green light (GL) induces sleep in mice. On the other hand, metabolic homeostasis is regulated by a variety of factors, including dietary habits and light exposure. Our study aims to study whether certain wavelength of light would affect metabolic status of mice...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999184/trophic-transfer-of-cyclic-methyl-siloxanes-in-the-marine-food-web-in-the-bohai-sea-china
#2
Song Cui, Qiang Fu, Lihui An, Ting Yu, Fuxiang Zhang, Shang Gao, Dong Liu, Hongliang Jia
Trophic transfer of cyclic methyl siloxanes (CMS) in aquatic ecosystems is an important criterion for assessing its environmental risks. This study researched the trophic transfer of four CMS (octamethylcyclotetrasiloxane (D4 ), decamethylcyclopentasiloxane (D5 ), dodecamethylcyclohexasiloxane (D6 ), and tetradecamethylcycloheptasiloxane (D7 )) in marine food web from zooplankton up to seabirds in the Chinese Bohai Sea. In the zooplankton-invertebrate-fish-seabird based food web, the significant trophic magnifications were found for D4 to D6 (D4 : R2  = 0...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999183/association-of-wheat-chaff-derived-silica-fiber-and-esophageal-cancer-in-north-china
#3
Changhong Lian, Shuzhe Xie, Weijun Li, Jinjiin Ran, Jian Zhang, Zheshen Han, Xinxin Zuo, Linwei Tian
BACKGROUND: Despite decades of research and intervention programs, the epidemic of esophageal squamous cell carcinoma (ESCC) in the Taihang Mountain area of north China has not seen convincing explanation by any risk factor yet and the incidence has not seen a substantial decrease. Based on recently disclosed association of aridity and wheat consumption with esophageal cancer, we revisited the hypothesis of biogenic silica in esophageal cancer development. METHODS: From the archives of the Pathology Department of Heping Hospital, Changzhi Medical College, we selected three pairs of formalin-fixed samples, tumor tissues and distant normal tissues, of three patients operated for ESCC who had no history of workplace exposure to silica dust...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999182/sa-and-am-symbiosis-modulate-antioxidant-defense-mechanisms-and-asada-pathway-in-chickpea-genotypes-under-salt-stress
#4
Amrit Bharti, Neera Garg
Salt stress disturbs redox homeostasis by perturbing equilibrium between generation and removal of reactive oxygen species (ROS), which alters the normal metabolism of plants through membrane damage, lipid peroxidation and denaturation of proteins. Salicylic acid (SA) seed priming and arbuscular mycorrhizal (AM) fungi impart salt tolerance in legumes by maintaining redox balance. The present investigation focused on the relative and combined applications of SA and Rhizoglomus intraradices in scavenging ROS in Cicer arietinum L...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999181/seasonal-variations-of-npahs-and-opahs-in-pm-2-5-at-heavily-polluted-urban-and-suburban-sites-in-north-china-concentrations-molecular-compositions-cancer-risk-assessments-and-sources
#5
Jingshu Li, Lingxiao Yang, Ying Gao, Pan Jiang, Yanyan Li, Tong Zhao, Junmei Zhang, Wenxing Wang
16 nitrated polycyclic aromatic hydrocarbons (NPAHs) and 5 oxygenated polycyclic aromatic hydrocarbons (OPAHs) in PM2.5 at two locations in Northern China were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Sampling was conducted at an urban site in Shandong University in Jinan (SDU) and a suburban site in Qixingtai in Jinan (QXT) in March, June, September and December in 2016. Overall, the concentrations of NPAHs and OPAHs were higher at SDU (1.88 and 9.49 ng/m3 , respectively) than QXT (1.57 and 6...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999180/insights-into-selenate-removal-mechanism-of-hydrogen-based-membrane-biofilm-reactor-for-nitrate-polluted-groundwater-treatment-based-on-anaerobic-biofilm-analysis
#6
Siqing Xia, Xiaoyin Xu, Lijie Zhou
The selenate removal mechanism of hydrogen-based membrane biofilm reactor (MBfR) for nitrate-polluted groundwater treatment was studied based on anaerobic biofilm analysis. A laboratory-scale MBfR was operated for over 60 days with electron balance, structural analysis, and bacterial community identification. Results showed that anaerobic biofilm had an excellent removal of both selenate (95%) and nitrate (100%). Reduction of Selenate → Selenite → Se0 with hydrogen was the main pathway of anaerobic biofilm for selenate removal with amorphous Se0 precipitate accumulating in the biofilm...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999179/protective-effects-of-tribulus-terrestris-extract-and-angiotensin-blockers-on-testis-steroidogenesis-in-copper-overloaded-rats
#7
Manar Hamed Arafa, Dalia Mohamed Amin, Ghada Mohammed Samir, Hebatallah Husseini Atteia
The rational of the current study was to assess whether Tribulus terrestris extract (TTE) could alleviate long-term copper (Cu) overload-induced testicular dysfunction compared to enalapril and losartan. Rats were administered either vehicle (control group, n = 10) or copper sulfate pentahydrate (CuSO4 ·5H2 O, 200 mg/kg, p.o) for 90 days (n = 40). Cu-treated rats were randomized into four equal groups. One group was left untreated (Cu group) while the remaining three groups were daily co-treated with one of the following treatments along with CuSO4: TTE (10 mg/kg, p...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30999178/male-workers-exposure-characteristics-of-%C3%AE-pcdd-f-from-a-municipal-solid-waste-incinerator-in-south-china-through-hair-analysis
#8
Li Jun Liu, Xi Chao Chen, Jian Ping Fu, Xian Qing, Jin Qiong Huang, Jing Lei Han
Human hair, flue gas and fly ash from a municipal solid waste incinerator (MSWI) in south China were collected and analyzed for polychlorinated dibenzo-p-dioxin (PCDD) and polychlorinated dibenzofuran (PCDF). The ΣPCDD/F level in hair from male workers were higher than those from residents. The Principal Component Analysis (PCA) suggested that ΣPCDD/F in flue gas is an external source of male workers' hair ΣPCDD/F. Results of daily intake of ΣPCDD/F by inhaling flue gas suggested that the inhalation exposure of ΣPCDD/F was at a slight health risk...
April 15, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30991247/milli-channel-array-for-direct-and-quick-reading-of-root-elongation-bioassays
#9
Joana Macagno, Maia R Lescano, Claudio L A Berli
A novel platform to perform systematic analysis and direct reading of root elongation bioassays is presented. The device was designed to include multiplexed microenvironments for the germination and growth of individual seeds, which allows observation by the naked eye or by optical systems, notably cellphone cameras. Prototypes were fabricated by laser micromachining on a highly transparent material that is fully compatible with biological systems. The effectiveness of the milli-channel array was verified against the conventional system (Petri dish)...
April 13, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30991246/effects-of-dissolved-humic-acid-on-fluoroquinolones-sorption-and-retention-to-kaolinite
#10
Yandan Li, Erping Bi, Honghan Chen
Fluoroquinolones (FQs) are widely used in human and veterinary medicaments, and as such are ubiquitous environmental contaminants. Dissolved organic matter (DOM) is widely distributed in natural water and sediment and dissolved humic acid (DHA) is a major component of DOM. The coexistence of DHA might influence the sorption, migration and transformation of FQs, thus determining their environmental fate. In this study, the interaction of DHA and ofloxacin (OFL)/flumequine (FLU) was evaluated using dialysis-bag assays...
April 13, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30991245/regulation-of-antioxidant-production-ion-uptake-and-productivity-in-potato-solanum-tuberosum-l-plant-inoculated-with-growth-promoting-salt-tolerant-bacillus-strains
#11
Muhammad Tahir, Iftikhar Ahmad, Muhammad Shahid, Ghulam Mustafa Shah, Abu Bakr Umer Farooq, Muhammad Akram, Sohail Akhtar Tabassum, Muhammad Asif Naeem, Umaira Khalid, Sajjad Ahmad, Ali Zakir
The exchangeable sodium (Na+ ) in salt affected soils is a major constraint in potassium (K+ ) availability to plants that disturb ion transport and inhibit plant growth, adversely. Salt tolerant plant growth promoting rhizobacteria (PGPR) may regulate the Na+ /K+ efflux and increase K+ uptake by the plant from the soil. Therefore, a pot study was performed to examine the effect of salt tolerant PGPR Bacillus sp. alone and in consortium, on antioxidant enzyme activity, ion uptake and potato (Solanum tuberosum L...
April 13, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30986629/simultaneous-passive-sampling-of-hydrophilic-and-hydrophobic-emerging-organic-contaminants-in-water
#12
Xiaozhong Gao, Yiping Xu, Mei Ma, Kaifeng Rao, Zijian Wang
Passive sampling techniques have been considered robust tools for monitoring freely dissolved concentrations of contaminants in aquatic systems. However, few passive samplers are currently available for the simultaneous sampling of both hydrophilic and hydrophobic chemicals. In this study, we developed a novel passive sampler (a hydrophilic-lipophilic balance sorbent-embedded cellulose acetate membrane (HECAM)) for estimating the time-weighted average (TWA) concentrations of both hydrophilic and hydrophobic organic contaminants in water...
April 12, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30986628/trophodynamics-and-parabolic-behaviors-of-polycyclic-aromatic-hydrocarbons-in-an-urbanized-lake-food-web-shanghai
#13
Abdul Qadeer, Min Liu, Jing Yang, Xinran Liu, Saira Khan Khalil, Yanping Huang, Md Habibullah-Al-Mamun, Dengzhou Gao, Yi Yang
Understanding the trophic movement and trophic magnification factor (TMF) of polycyclic aromatic hydrocarbons (PAHs) is an important criterion to assess their fate and potential effects in an aquatic ecosystem. This study investigated concentrations and trophodynamics of 16 priority PAHs in food webwb (food web comprising whole bodies) and food webm (food web containing only muscles) of total 14 species ((including plankton, shrimp, whitebait, mussels, snails, red-eared terrapin and seven other fish species) from the Dianshan Lake...
April 12, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30981444/application-of-ecogeochemical-prediction-model-to-safely-exploit-seleniferous-soil
#14
Qiubei Gu, Zhongfang Yang, Tao Yu, Junfeng Ji, Qingye Hou, Qizuan Zhang
Seleniferous soil and crops have recently attracted attention worldwide. Cultivating seleniferous crops in the absence of heavy metals is greatly challenging. This study aimed to develop approaches for the safe exploitation of seleniferous soil. We collected 246 pairs of rice grain samples and their corresponding rhizosphere soil samples and 8542 topsoil samples from Binyang and Xingbin in Guangxi. The Cd, Cu, Hg, Pb, Zn, and Se contents of soil and rice grain samples were tested. Several soil properties, including CaO, Mn, Mo, and S contents; total organic carbon content; and pH were also measured...
April 10, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30981044/extremely-acidic-environment-biogeochemical-effects-on-algal-biofilms
#15
Ana Teresa Luís, Manuela Teixeira, Nuno Durães, Raquel Pinto, Salomé F P Almeida, Eduardo Ferreira da Silva, Etelvina Figueira
The biological responses of acidobiontic species to extremely acidic waters, as those related with Acid Mine Drainage (AMD) processes, are relevant not only to understand the toxicological degree of the waters as well as the mechanisms responsible for the survival and adaptation of such organisms. Therefore, the objective of this study was to evaluate the effect of acidic pH and metals in biofilms collected in two sites a lentic permanent acid pond (AP) and a temporary acid stream (AS) affected by Acid Mine Drainage (AMD), and taking as control (C), an uncontaminated site with circumneutral pH...
April 10, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30981043/presence-and-environmental-risk-assessment-of-selected-antibiotics-in-coastal-water-adjacent-to-mariculture-areas-in-the-bohai-sea
#16
Juan Du, Hongxia Zhao, Yan Wang, Huaijun Xie, Minghua Zhu, Jingwen Chen
The presence and concentrations of 25 antibiotics in Dalian coastal water of the Bohai Sea were investigated using solid-phase extraction coupled with high-performance liquid chromatography tandem mass spectrometry. Results showed that antibiotics were widely detected in this region with total concentration ranging from 22.6 to 2402.4 ng/L. Enrofloxacin and trimethoprim were 100% detected followed by sulfamethoxazole with a detection rate of 90.9%. No significant correlations were found between antibiotics concentrations and sample parameters such as dissolved organic carbon, salinity, and distance from the coast, suggesting that concentrations and distributions of the antibiotics in this area were source-dependent...
April 10, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30980964/enhanced-drought-tolerance-of-foxtail-millet-seedlings-by-sulfur-dioxide-fumigation
#17
Yansha Han, Hao Yang, Mengyang Wu, Huilan Yi
Recently, sulfur dioxide (SO2 ) has been considered to be a beneficial bio-regulator in animals. However, the positive roles of SO2 in plant adaptation to drought stress are still unclear. In this study, we investigated the physiological and molecular changes that are induced by SO2 fumigation to improve the drought tolerance of foxtail millet seedlings. The relative water content in the leaves of drought-stressed seedlings was significantly improved by pre-exposure to 30 mg/m3 SO2 . These responses might be related to decreased stomatal apertures and a reduced leaf transpiration rate, which were induced by SO2 under drought conditions...
April 10, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30980963/microevolution-or-wide-tolerance-level-of-stress-proteins-in-the-beet-armyworm-spodoptera-eqigua-h%C3%A3-bner-lepidoptera-noctuidae-exposed-to-cadmium-for-over-150-generations
#18
Monika Tarnawska, Alina Kafel, Maria Augustyniak, Magdalena Rost-Roszkowska, Agnieszka Babczyńska
The aim of this study was to investigate whether the cadmium tolerance developed in the beet armyworm Spodoptera exigua selected for over 150 generations may be related to synthesis of the stress proteins metallothioneins (Mts) and 70 kDa heat shock proteins (HSP70). To achieve this, six S. exigua strains (control, k), 150-generation Cd exposure strain (cd), and four 18-generation Cd exposure strains differing in Cd concentration (cd44, cd22, cd11, cd5) were reared. Stress protein level was measured in the midgut of the 5th larval stage after 1-6, 12 and 18 generations...
April 10, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30978653/pollution-of-polycyclic-aromatic-hydrocarbons-pahs-in-drinking-water-of-china-composition-distribution-and-influencing-factors
#19
Ying Zhang, Lifen Zhang, Zhiping Huang, Yuna Li, Jiafu Li, Nan Wu, Jiahui He, Zhaozhao Zhang, Yunqing Liu, Zhiguang Niu
Polycyclic aromatic hydrocarbons (PAHs) are a kind of persistent toxic substances, which have been frequently detected in environmental media. However, studies on their occurrences and distributions in drinking water are insufficient and their composition profiles in drinking water are still not clear. In this study, we investigated 16 priority polycyclic aromatic hydrocarbons (PAHs) in drinking water from different administrative level cities throughout mainland China, analyzed the influences of anthropogenic activities on PAHs, and assessed the health risk of the PAHs in drinking water...
April 9, 2019: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/30974248/the-drivers-of-bacterial-community-underlying-biogeographical-pattern-in-mollisol-area-of-china
#20
Lei Wang, Xing Zhang, Ying Li, Ruixue Sun, Yulong Lin, Hui Yu, Yuewen Xue, Xinzhu Zhou, Weixin Liu, Lilong Yan, Ying Zhang
In order to better understand the composition and driving factors of the bacterial community in Mollisols, we selected 9 representative facility agricultural lands in Mollisol area of China for sampling, and described it on a larger spatial scale. Soil bacterial community structure in these 9 regions (determined by high-throughput sequencing analysis) showed significant differences at the genus level. The correlation between bacterial community composition and soil properties, contaminants and geographical latitude showed that the diversity of bacterial community was still strongly correlated with pH and SOM under the influence of phthalates (P < 0...
April 8, 2019: Ecotoxicology and Environmental Safety
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