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Alterations of endotoxin distribution across different biofluids and relevant inflammatory responses by supplementing L-theanine in dairy cows during heat stress

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Animal Nutrition 2021年第4期7卷 1253-1257页

作者： Zuo Wang Lingmei Zhang Zhicai Li Yuannian Yu Lingyuan Yang Peihua Zhang Weijun Shen Fachun Wan Jianhua He Wenjun Xiao Dasheng Yang Zhiliang Tan Shaoxun Tang College of Animal Science and Technology Hunan Agricultural UniversityChangshaHunan410128China Key Laboratory of Agro-Ecological Processes in Subtropical Region National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionHunan Provincial Key Laboratory of Animal Nutritional Physiology and Metabolic ProcessInstitute of Subtropical AgricultureChinese Academy of SciencesChangshaHunan410125China College of Horticulture Hunan Agricultural UniversityChangshaHunan410128China Deren Dairy Co.Ltd. ChangdeHunan415921China

The present trial was performed to reveal the regulatory effects of L-theanine on the levels of lipopolysaccharide(LPS)endotoxin within different biofluids,as well as relevant inflammatory responses of dairy cattle under heat stress *** lactating Chinese Holstein dairy cattle(189±47 d in milk,and 2±1 parities)were allocated in a completely randomized design to each of 3 dietary treatments:the control(CON,0 g/d per cow L-theanine),the low L-theanine dosage treatment(LL,16 g/d per cow L-theanine),and the high L-theanine dosage treatment(HL,32 g/d per cow L-theanine).This trial consisted of 38 d(7 d for adaption and 31 d for data and sample collection),and sample collection for rumen liquid,blood plasma or serum,and milk were conducted on the d 27 and 38,*** cattle were constantly exposed to environmental heat stress during this experiment according to the recorded temperature-humidity index(THI).In the LL treatment,LPS concentration in rumen liquid was higher(P<0.05),whilst LPS densities in plasma and milk were lower(P<0.05)than those of the *** L-theanine at 2 dosages both significantly lowered(P<0.05)the level of interleukin(IL)-1βin the *** of the present study suggested that L-theanine could be a promising additive in reducing the detrimental effects of heat stress on dairy cows,and L-theanine supplementation at 16 g/d per cow is preferred because it reduced the LPS translocation into the peripheral blood and LPS accumulation in the milk,as well as mitigated LPS-induced inflammatory reactions in dairy cows during heat *** studies are necessitated to investigate the underlying mechanisms of L-theanine in LPS alteration and inflammation alleviation.

关键词： Heat stress Endotoxin L-theanine Inflammation

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Legacy and currently-used pesticides in sedimentary archives: Anthropogenic footprint in the pearl river estuary

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Science of the Total Environment 2025年 976卷 179300页

作者： Tian, Lele Zhao, Shizhen Zhong, Guangcai Li, Jun Hu, Jianfang Zhang, Gan State Key Laboratory of Advanced Environmental Technology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou510640 China University of Chinese Academy of Sciences Beijing100049 China

Pesticides are fundamental to modern agriculture but pose significant environmental risks due to their persistence, bioaccumulation potential, and toxicity. This study systematically investigates the pollution characteristics and historical trends of 28 legacy organochlorine pesticides (OCPs) and 17 currently-used pesticides (CUPs) in a sediment core from the Pearl River Estuary (PRE), assessing their potential as Anthropocene markers. The concentrations of Σ28OCPs ranged from 0.788 to 9.12 ng/g, dominated by dichlorodiphenyltrichloroethanes (DDTs, 49 ± 21 %) and chlordane (9 ± 6 %), while the Σ17CUP concentrations were an order of magnitude higher, ranging from 4.85 to 98.4 ng/g, with pyrethroids contributing 50–99 %. This shift in pesticide composition reflects the historical transition from OCPs to CUPs in China's pesticide usage. Temporal trends (1919–2019) showed that the concentrations of DDTs, chlordane, pyrethroids, and dicofol closely mirrored their usage history in China, demonstrating that sediment cores effectively record pesticide application history. Redundancy analysis identified total organic carbon, temperature, and precipitation as key environmental factors influencing the concentrations of DDTs, chlordane, pyrethroids, and dicofol. Correlation analysis further demonstrated that the concentrations of DDTs and phenothrin were linked to population, GDP, and agricultural activities, whereas dicofol, parathion-methyl, and bromophos-ethyl were primarily driven by agricultural activities. Moreover, DDT exhibited temporally abrupt trends, broad geographic signals, and permanent environmental records, suggesting its potential as a robust Anthropocene marker. This study provides critical insights into pesticide pollution dynamics and highlights the value of legacy and emerging pollutants in tracking human impacts on Earth's environmental systems. © 2025 Elsevier B.V.

关键词： Anthropogenic

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Study on Adsorption of Heavy Metals Cu and Zn by Microplastics Under Different Aged Factors

Study on Adsorption of Heavy Metals Cu and Zn by Microplasti...

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作者： Wenxi Teng Xiang Zhang Yalin Yang Jinfeng Zeng Junfeng Lian Xinxin Qin Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and Technology Hydrology and Water Resources Monitoring Center for Ganjiang Upstream Watershed Jiangxi Provincial Key Laboratory of Environmental Geotechnology and Engineering Disaster Control Jiangxi University of Science and Technology

Microplastics are widely distributed in a variety of environments,absorbing heavy metals in the environment while aging due to various environmental *** this paper,the effects of different aging factors（pH,DOM,and HO） on the adsorption capacity of heavy metals Cu and Zn on polyethylene microplastics（PE-MPs） were investigated,and the changes in physical and chemical properties of PE microplastics were *** results demonstrate that HO aging bears the greatest effect on the adsorption effect of PE microplastics,dissolved organic matter（DOM） aging has the least effect on the adsorption effect of PE microplastics,and the adsorption effect of microplastics aged with pH=9 is stronger than that aged with pH=4;the adsorption kinetics model of microplastics fitted to the pseudo-second-order kinetic model,and the thermodynamic model fitted to Langmuir model;aging mainly changed the surface structure of microplastics,increased the Zeta potential of microplastics,introduced more oxygen-containing functional groups,and finally affected the ability of microplastics to adsorb heavy *** research provides data reference for understanding the influence of different aging on the adsorption capacity of heavy metals in microplastics.

关键词： Study on Adsorption of Heavy Metals Cu and Zn by Microplastics Under Different Aged Factors

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Effect of Polystyrene Microplastics on Tetracycline Photoconversion Under Simulated Sunlight: Vital Role of Aged Polystyrene

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SSRN 2023年

作者： Wang, Zhexian Zhai, Yunbo Liu, Guangli Liu, Xiangmin Liu, Xiaoping Zhou, Yin Huang, Cheng Wang, Wenjun Xu, Min College of Environmental Science and Engineering Hunan University Changsha410082 China Key Laboratory of Environmental Biology and Pollution Control Hunan University Ministry of Education Changsha410082 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou510006 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China Chinese Academy of Environmental Planning Beijing100012 China

Photoconversion of tetracycline (TC) has been widely reported, but the effect of microplastics (MPs) on TC conversion kinetics and mechanism is rarely discussed. In this study, the effect of (aged) MPs on TC degradation under simulated sunlight was investigated, and the mechanism was also discussed. The physical and chemical properties of polystyrene (PS), including particle size, surface groups and morphology, were significantly changed after aging. Furthermore, photoconversion efficiency of TC was suppressed with the spiking of aged PS, while virgin PS presented opposite tendency. 1O2 and HO were involved in the photodegradation reaction for photosensitization of PS, and light-screening of aged PS occupied predominance, which weakened direct UV-light absorption of TC and resulted in lower TC degradation efficiency. In addition, triplet-excited state PS generated after photon acceptance of aged PS, which could transfer energy to O2, and further caused the production of 1O2. The toxicity test manifested that the direct influence of TC products on fathead minnow was ignorable, but its long-term negative effect on growth deserved to observe. This study is beneficial for understanding the environmental fate of PS and TC under sunlight, and provides crucial reference information for better evaluating the potential risk of MPs and chemicals. © 2023, The Authors. All rights reserved.

关键词： Polystyrenes

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control of arsenic methylation in paddy soils by iron nanoparticles

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Science of the Total Environment 2024年 957卷 177828页

作者： Gu, Tianhang Ni, Zhuobiao Zhao, Qingqing Li, Ruofan Qiu, Rongliang Zhang, Wei-xian School of Environmental Science and Engineering Zhejiang University of Water Resources and Electric Power Hangzhou310018 China State Key Laboratory for Pollution Control School of Environmental Science and Engineering Shanghai Institute of Pollution Control and Ecological Security Tongji University Shanghai200092 China Guangdong Laboratory for Lingnan Modern Agriculture Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety College of Natural Resources and Environment South China Agricultural University Guangzhou510642 China School of Civil Engineering and Architecture Zhejiang University of Science and Technology Hangzhou310023 China

Rice, as the most essential food grain, is frequently exposed to high concentrations of arsenic. Among the arsenic species, dimethylarsenate (DMAs(V)) is preferentially translocated from paddy soils to rice grains, posing serious threats to food safety and yield. Herein, we report an efficient strategy for DMAs(V) mitigation in paddy soils with nanoscale Zero-Valent Iron (nZVI). Species and concentrations of arsenic in paddy porewater were monitored during a 28-d soil-water incubation. Effects of nZVI dose towards microbial sulfate reduction and methane generation potential in paddy soils, which are crucial for arsenic methylation and demethylation, were analyzed via metagenomic sequencing. Results demonstrated that the maximal DMAs(V) concentration in paddy porewater decreased from 0.37 to 0.04 μM in arsenic-contaminated paddy soils with nZVI dose increasing from 0 to 5.0 g/kg. Accordingly, the maximal concentration of inorganic arsenite (iAs(III)), which is the precursor of DMAs(V), decreased from 1.39 to 0.23 μM. Furthermore, the application of nZVI reshaped the structure of microbial community in paddy soils. Specifically, the relative abundance of δ-proteobacteria involved in sulfate reduction, which is crucial for iAs(III) methylation, waned from 7.62 % to 3.17 %, while that of Methanomicrobia for DMAs(V) demethylation and methanogenesis proliferated from 7.03 % to 13.62 %, with nZVI dose increasing from 0 to 5.0 g/kg. Via simultaneous inhibition of DMAs(V) formation and acceleration of DMAs(V) transformation, nZVI efficiently controls the accumulation of DMAs(V) in paddy porewater. In conclusion, these findings prove the efficient performance for DMAs(V) mitigation with nZVI and uncover its underlying mechanisms. © 2024

关键词： Methylation

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Cu Inanchored Mno/Carbonaceous Frameworks Trigger Peroxymonosulfate Activation for Enrofloxacin Degradation: ROS Generation and Pollutant Attacking Processes

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SSRN 2024年

作者： Niu, Huai-Yuan Dong, Zheng-Tao Guo, Hai Yang, Ya-Ya Li, Jin-Cheng Yan, Ming Li, Ji-Shan Niu, Cheng-Gang Yang, Wen-Jie State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha410082 China College of Environmental Science and Engineering Key Laboratory of Environmental Biology and Pollution Control Ministry of Education Hunan University Changsha410082 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China Hunan University China

Despite Fluoroquinolone antibiotics (FQs) removal in peroxymonosulfate (PMS) activation have been widely researched and the outstanding degradation performance have been gained, the detailed processes by which reactive oxygen species attack pollutants have not been adequately studied. In this study, a Cu/MnO catalyst, denoted as 4CuMn/C-800, is anchored onto carbonaceous frameworks derived from biomass sources using a one-step calcination method for investigation. Benefiting from the sp2 unsaturated carbon as well as the synergistic effect between Cu2+/Cu+/Cu and Mn3+/Mn2+ bimetallic redox electron pairs, the prepared 4CuMn/C-800 material possesses excellent enrofloxacin (ENR) removal performance, where 85.5% of ENR is degraded in 80 min, and maintains relatively high catalysis performance even in the various reaction conditions (reaction pH, reaction temperature, existing anions etc.). The analysis reveals the 1O2 and •O2-, as the dominate ROS, continuously attack the specific active sites of ENR molecules until they are mineralized. In detail, the generated •O2- mainly attacks the piperazine ring, while the formed 1O2 assaults the quinolone group of ENR. By combining density functional theory (DFT) calculations with LC-MS analysis, we propose four distinct pathways for ENR degradation in the 4CuMn/C-800/PMS system. In summary, this study offers a novel and practical approach to design metal/metal oxide/carbon catalysts and enhances our understanding of the mechanisms behind ROS-driven PMS activation. © 2024, The Authors. All rights reserved.

关键词： Manganese oxide

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Efficient Electrochemical Degradation of Ranitidine by a Novel Bi-Doped Titanium Oxide Electrode: Performance and Mechanism

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SSRN 2024年

作者： Xu, Jianhui Liu, Zhongwen Li, Dan Zhang, Yunfei Liu, Peng Wu, Qi Hong, Wentao Guo, Zining Cao, Kexin Chen, Junming Quan, Xin Cui, Zhijie School of Environment and Civil Engineering Dongguan University of Technology Dongguan523808 China State Key Laboratory of Organic Geochemistry Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Wuhan510640 China Guangdong Provincial Key Laboratory of Environmental Protection and Resources and Utilization Guangzhou510640 China

Ranitidine (RAN), a medication frequently prescribed for various conditions, poses ecological risks due to its potential to transform into the carcinogenic byproduct N-nitrosodimethylamine (NDMA) within environmental systems. In this study, bismuth-doped titanium (Bi-Ti4O7), a novel and environmentally benign material, was synthesized via a straightforward coating method and evaluated for its effectiveness in the electrochemical oxidation of RAN. Compared to Ti4O7 electrode, the Bi-Ti4O7 electrode presents a remarkable promotion effect on the degradation of RAN, achieving a degradation efficiency of up to 90.41% for an initial RAN concentration of 10 mg/L within 120 min. The doping with Bi was observed to elevate the concentration of oxygen vacancies and to amplify the charge transfer characteristics at the Ti4O7 surface, thereby facilitating direct electron transfer (DET) between RAN and Bi-Ti4O7 electrode. Eight oxidation intermediates were identified during the electrochemical oxidation of RAN by Bi-Ti4O7 electrode, in which no NDMA was generated. The potential degradation pathways for RAN were proposed, including C-S bond cleavage, C-N bond cleavage, and electrophilic oxidation. The toxicity of RAN oxidation intermediates was significantly mitigated following electrochemical oxidation mediated by Bi-Ti4O7 electrode. Bi-Ti4O7 electrode maintained excellent oxidation efficiency of RAN (> 90%) within 20 degradation cycles. Furthermore, the Bi-Ti4O7 electrode showcased excellent pH adaptability and a wide applicability to diverse wastewater types, along with negligible release of Bi ion (0.148 µg/L), indicating its substantial potential for practical use. These results highlight the efficacy of Bi incorporation as a strategic approach for the remediation of RAN-polluted wastewater. © 2024, The Authors. All rights reserved.

关键词： Electrochemical oxidation

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The long-term effectiveness of ferromanganese biochar in soil Cd stabilization and reduction of Cd bioaccumulation in rice

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Biochar 2021年第4期3卷 499-509页

作者： Yuling Liu Haiyan Luo Boqing Tie Danyang Li Shoutao Liu Ming Lei Huihui Du Hunan Engineering&Technology Research Center for Irrigation Water Purification College of Resources and EnvironmentHunan Agricultural UniversityChangsha 410128People’s Republic of China Key Laboratory of Southern Farmland Pollution Prevention and Control Ministry of AgricultureChangsha 410128China Hunan Institute of Agro-Environment and Ecology Changsha 410128China

The application of Fe-Mn-modified biochar for the remediation of Cd-contaminated soil over long time periods has been little *** this paper,we describe the performance of coconut-shell-derived biochar modified with ferromanganese in relation to soil Cd stabilization and rice Cd bioaccumulation during a 3-year laboratory *** application dosages(0.05-0.5 wt%)and different rice varieties(the early and late rice)are also *** results show that ferromanganese is mainly loaded in biochar pores as MnFe_(2)O_(4),and that it decreases the specific surface area(SSA)and total pore volume of *** biochar(0.5 wt%)applied to paddy soil is more effective than the same dose of pristine biochar in decreasing the soil-exchangeable Cd fraction(27.42-41.92%vs 22.56-33.85%),predominantly by decreasing soil Eh and increasing root Fe *** biochar application helps to reduce Cd bioaccumulation in rice,especially in the grain(up to 48.6%-61.0%),and grain Cd levels(0.2 mg/kg)are all within the acceptable limit for food security in *** is shown that ferromanganese modification and application can maintain soil at low redox status,keep root Fe plaques at a high level,and may also increase the stability of pristine *** of these effects contribute to maintaining its high remediation efficiency over a 3-year inoculation *** results presented in this paper demonstrate the potential appli-cations of ferromanganese biochar in soil remediation and the improvement of food safety.

关键词： Biochar Ferromanganese Modification Cadmium Stabilization

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Yeast-based nucleotide supplementation in mother sows modifies the intestinal barrier function and immune response of neonatal pigs

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Animal Nutrition 2021年第1期7卷 84-93页

作者： Lumin Gao Chunyan Xie Xiaoxiao Liang Zhihong Li Biao Li Xin Wu Yulong Yin Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionHunan Provincial Engineering Research Center for Healthy Livestock and Poultry ProductionChangshaHunan 410125China Hunan Co-Innovation Center of Safety Animal Production College of Resources and EnvironmentHunan Agricultural UniversityChangsha 410128China Henan Zhongke Ground Food Co. LtdZhengzhou 450001China The Hubei Provincial Key Laboratory of Yeast Function Angel Yeast Co.LtdYichang 443003China Institute of Biological Resources Jiangxi Academy of SciencesNanchang 330096China

In the present study,we aimed to evaluate the effects of maternal yeast-based nucleotide(YN)sup-plementation on the intestinal immune response and barrier function in neonatal pigs,as well as the diarrhoea rate and growth performance in suckling ***-four late-gestation sows were assigned to the following groups:the CON(fed a basal diet)and YN groups(fed a basal diet with 4 g YN/kg diet).The experiment started on d 85 of gestation and ended on d 20 of *** rate and average daily gain of the piglets were recorded,and samples of blood and intestines from neonatal piglets were collected before they consumed colostrum during *** with the CON group,maternal YN supplementation increased the weaning weight of litter and decreased the diarrhoea rate(P<0.01).In addition,maternal YN supplementation promoted the ileal villus development in the neonates compared with that in the CON group(P<0.01).Maternal YN supplementation also increased the ileal secretory immunoglobulin A(sIgA)level compared with that in the CON group(P<0.05).The real-time PCR results showed that maternal dietary YN supplementation increased the jejunal and ileal expression of interleukin(IL)-17,IL-8,IL-1β,IL-10 and tumor necrosis factor(TNF)-αin the neonates compared with that in the CON group(P<0.05).Overall,maternal nucleotide supplementation improved the villus development and innate immunity of neonatal piglets during late *** may be associated with the decrease in diarrhoea and the increase in weaning weight of the litter of suckling piglets.

关键词： Nucleotide Diarrhoea Growth performance Sow Neonatal piglet

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Microbially-driven phosphorus cycling and its coupling mechanisms with nitrogen cycling in mangrove sediments

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Science of the Total Environment 2025年 958卷 178118页

作者： Liu, Fei Zeng, Jiaxiong Ding, Jijuan Wang, Cheng He, Zhili Liu, Zhiwei Shu, Longfei School of Life Sciences Jiaying University Meizhou514015 China Conservation and Utilization Laboratory of Mountain Characteristic Resources in Guangdong Province Meizhou514015 China School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology State Key Laboratory for Biocontrol Sun Yat-sen University Guangzhou510275 China Zhuhai509082 China

The phosphorus (P) cycle plays a crucial role in the biogeochemical cycling of mangrove sediments. However, the diversity of microbially-driven P-cycling and its coupling with nitrogen (N)-cycling remain poorly understood. In this study, we used metagenomic approaches to investigate microbial P-cycling and its potential interactions with N-cycling in mangrove sediments. Our results revealed that pH, total carbon, and total nitrogen were key environmental factors influencing the diversity of P-cycling microbial communities. Phosphorus metabolic pathways differed among mangrove sediment depths. In surface sediments (0–5 cm), microbial communities primarily acquired readily available inorganic phosphorus, whereas, in deeper sediments (>60 cm), they hydrolyzed more persistent triphosphates, reabsorbed nucleotides, and sourced free phosphate, reflecting a shift in phosphorus transport modes. We also identified glutamate metabolism as a potential pathway linking P-cycling with N-cycling, with these functions co-occurring in both contigs and genomes. Additionally, the diversity of microbial communities associated with the P-cycling increased with sediment depth, suggesting that microbially-driven P-cycling diversifies as depth increases. This study provides new insights into P-cycling and its potential coupling with N-cycling through glutamate metabolism, its coupling with N-cycling through glutamate metabolism. © 2024 Elsevier B.V.

关键词： Abiotic

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