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Determination of particulate polycyclic aromatic hydrocarbons in ambient air by gas chromatography-mass spectrometry after molecularly imprinted polymer extraction

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Journal of Environmental Sciences 2023年第2期124卷 644-654页

作者： Maria Chiara Pietrogrande Giorgia Demaria mara russo Department of Chemical Pharmaceutical and Agraricultural SciencesUniversity of FerraraVia Fossato di Mortara 17/1944121 FerraraItaly

A solid phase extraction procedure(SPE)is described for the quantitative analysis of polycyclic aromatic hydrocarbons(PAHs)in atmospheric particulate matter(PM),as ubiquitous environmental pollutants routinely measured in air qualitymonitoring.A SPE cartridge was used based on a molecular imprinted polymer(MIP-SPE)properly tailored for selective retention of PAHs with 4 and more benzene fused *** performance of the clean-up procedure was evaluated with the specific concern of selective purification towards saturated hydrocarbons,which are the PM components mostly interfering GC analysis of target *** optimized operative conditions,the MIP-SPE provided analyte recovery close to 95%for heavier PAHs,from benzo(α)pyrene to benzo(ghi)perylene,and close to 90%for four benzene rings PAHs,with good reproducibility(RSDs:2.5%-5.9%).Otherwise,C_(17)-C_(32) n-alkanes were nearly completely *** proposed method was critically compared with Solid Phase Micro Extraction(SPME)using a polyacrylate *** methods were successfully applied to the analysis of ambient PM2.5 samples collected at an urban polluted *** the two procedures,the MIP-SPE provided the highest recovery(R%≥93%)for PAHs with 5 and more benzene rings,but lower for lighter *** contrast,SPME showed a mean acceptable R%value(∼80%)for all the investigated PAHs,except for the heaviest PAHs in the most polluted samples(R%:110%-138%),suggesting an incomplete purification from the interfering n-hydrocarbons.

关键词： Polycyclic aromatic hydrocarbons Atmospheric particle matter Molecularly imprinted polymers-solid-phase extraction Solid phase micro extraction GC/MS analysis

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Murine model to study brain,behavior and immunity during hepatic encephalopathy

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World Journal of Hepatology 2014年第4期6卷 243-250页

作者： Lindisley Ferreira Gomides Pedro Elias Marques Bruno Engler Faleiros Rafaela Vaz Pereira Sylvia Stella Amaral Thais Reis Lage Gustavo Henrique Souza Resende Patricia Alves Maia Guidine Giselle Foureaux Fabíola mara Ribeiro Fabiana Paiva Martins Marco Antonio Peliky Fontes Anderson José Ferreira Remo Castro russo Mauro Martins Teixeira Márcio Flávio Moraes Antonio Lúcio Teixeira Gustavo Batista Menezes Laboratório de Imunobiofotonica Department of MorphologyICBUFMGBelo Horizonte 31270-901Brazil School of Medicine UFMGBelo Horizonte 31270-901Brazil Department of Physiology ICBUFMGBelo Horizonte 31270-901Brazil Department of Morphology UFMGBelo Horizonte 31270-901Brazil Department of Biochemistry and Immunology UFMGBelo Horizonte 31270-901Brazil

AIM:To propose an alternative model of hepatic encephalopathy(HE) in mice,resembling the human features of the ***:Mice received two consecutive intraperitoneal injections of thioacetamide(TAA) at low dosage(300 mg/kg).Liver injury was assessed by serum transaminase levels(ALT) and liver histology(hematoxylin and eosin).Neutrophil infiltration was estimated by confocal liver intravital *** was evaluated using prolonged prothrombin and partial thromboplastin *** parameters were measured through tail *** levels were quantified in serum and brain ***(EEG) and psychomotor activity score were performed to show brain *** edema was evaluated using magnetic resonance ***:Mice submitted to the TAA regime developed massive liver injury,as shown by elevation of serum ALT levels and a high degree of liver *** intense hepatic neutrophil accumulation occurred in response to TAA-induced liver *** led to mice mortality and weight loss,which was associated with severe ***,TAA-treated mice presented with increased serum and cerebral levels of ammonia,in parallel with alterations in EEG spectrum and discrete brain edema,as shown by magnetic resonance *** agreement with this,neuropsychomotor abnormalities ensued 36 h after TAA,fulfilling several HE features observed in *** this context of liver injury and neurological dysfunction,we observed lung inflammation and alterations in blood pressure and heart rate that were indicative of multiple organ dysfunction ***:In summary,we describe a new murine model of hepatic encephalopathy comprising multiple features of the disease in humans,which may provide new insights for treatment.

关键词： Hepatic encephalopathy Liver injury Thioacetamide Neurological dysfunction Neuropsychomotor abnormalities Intracranial hypertension Cerebral herniation

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小胶质细胞在光/暗周期过程中调节海马突触传递和睡眠持续时间

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神经损伤与功能重建 2022年第5期17卷 310-310页

作者：杜一星(编译) Department of Physiology and Pharmacology Sapienza University of Rome Axe Neurosciences Centre de Recherche du CHU de Québec Université Laval Quebec City Department of Neurology San Raffaele of Cassino 4. National Research Council Institute of Biochemistry and Cell Biology (EMMA/Infrafrontier/IMPC ) International Campus "A. Buzzati-Traverso" INRAE Bordeaux INP NutriNeuro UMR 1286 Bordeaux University Tecniplast S.P.A. Buguggiate Department of Molecular Medicine Sapienza University INSERM Neurocentre Magendie Physiopathologie de la Plasticité Neuronale Division of Medical Sciences University of Victoria The Department of Biochemistry and Molecular Biology The University of British Columbia Department of Physiology and Pharmacology Sapienza University Laboratory affiliated to Istituto Pasteur Italia Department of Neurophysiology Neuropharmacology Inflammaging IRCCS Neuromed

小胶质细胞是大脑的常驻巨噬细胞,通过感知神经元活动并支持突触重塑和可塑性积极促进脑实质的稳态。虽然已有研究表明星形胶质细胞在睡眠中的不同作用,但小胶质细胞在调节睡眠/觉醒周期和白天不同阶段调节突触活动中的作用尚未深入研... 详细信息

小胶质细胞是大脑的常驻巨噬细胞,通过感知神经元活动并支持突触重塑和可塑性积极促进脑实质的稳态。虽然已有研究表明星形胶质细胞在睡眠中的不同作用,但小胶质细胞在调节睡眠/觉醒周期和白天不同阶段调节突触活动中的作用尚未深入研究。以光作为授时提示,我们研究了用集落刺激因子-1受体拮抗剂PLX5622消除小胶质细胞对雄性小鼠睡眠/觉醒周期和海马突触传递的影响。我们的数据表明,小胶质细胞几乎完全的耗竭会增加NREM睡眠的持续时间并减少海马兴奋性神经传递。由于cx3cr1GFP/GFP小鼠显现与PLX5622处理的小鼠中发现的相同情况,趋化因子fractalkine受体CX3CR1在这些效应中起相关作用。此外,在光照阶段小胶质细胞表达较低水平的cx3cr1;当培养的小胶质细胞受到ATP(一种在睡眠期间释放的嘌呤能分子)的刺激时其cx3cr1表达降低。我们的研究结果表明,小胶质细胞参与调节睡眠,调整其cx3cr1表达以响应光/暗阶段,并以时相依赖性方式调节突触活动。

关键词： cx3cr1 脑电图长期增强小胶质细胞耗竭微型兴奋性突触后电流睡觉眠自发兴奋性突触后电流

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