WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0...WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0.1))_(2)(C,N),the grains size of WC and mean free path of Co phase decrease,and adjacency of WC increases.Refinement and homogenization of grains enhance the transverse rupture strength(TRS)and the hardness.Meanwhile,the deflection and bridging of cracks keep the fracture toughness at a respectable level.The WC-10Co-0.6(Cr_(0.9),V_(0.1))_(2)(C,N)-0.025(V_(0.9),Cr_(0.1))_(2)(C,N)cemented carbides exhibit excellent comprehensive mechanical properties with the TRS of 4602.6 MPa,hardness of 1835 kg/mm^(2),and fracture toughness of 10.39 MPa·m^(1/2),respectively.However,the large pores are caused by excess N larger than 0.03 wt%and deteriorates the mechanical properties.We provide a new approach to WC-Co cemented carbides preparation with a narrow grain size distribution by adding novel grain growth inhibitors.展开更多
Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the pr...Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the primary visual cortex(V1)is altered in glaucoma.This study used DBA/2J mice as a model for spontaneous secondary glaucoma.The aim of the study was to compare the electrophysiological and histomorphological chara cteristics of neurons in the V1between 9-month-old DBA/2J mice and age-matched C57BL/6J mice.We conducted single-unit recordings in the V1 of light-anesthetized mice to measure the visually induced responses,including single-unit spiking and gamma band oscillations.The morphology of layerⅡ/Ⅲneurons was determined by neuronal nuclear antigen staining and Nissl staining of brain tissue sections.Eighty-seven neurons from eight DBA/2J mice and eighty-one neurons from eight C57BL/6J mice were examined.Compared with the C57BL/6J group,V1 neurons in the DBA/2J group exhibited weaker visual tuning and impaired spatial summation.Moreove r,fewer neuro ns were observed in the V1 of DBA/2J mice compared with C57BL/6J mice.These findings suggest that DBA/2J mice have fewer neurons in the VI compared with C57BL/6J mice,and that these neurons have impaired visual tuning.Our findings provide a better understanding of the pathological changes that occur in V1 neuron function and morphology in the DBA/2J mouse model.This study might offer some innovative perspectives regarding the treatment of glaucoma.展开更多
目的探究N-乙酰半胱氨酸对支气管哮喘大鼠CXC趋化因子配体(CXCL)8-CXC趋化因子受体(CXCR)1/2及瞬时受体电位通道蛋白(TRP)V1神经元敏感性的影响。方法选取80只SPF级SD雄性大鼠,随机分为正常(NO)组、模型(MO)组、N-乙酰半胱氨酸(NAC)组...目的探究N-乙酰半胱氨酸对支气管哮喘大鼠CXC趋化因子配体(CXCL)8-CXC趋化因子受体(CXCR)1/2及瞬时受体电位通道蛋白(TRP)V1神经元敏感性的影响。方法选取80只SPF级SD雄性大鼠,随机分为正常(NO)组、模型(MO)组、N-乙酰半胱氨酸(NAC)组、急支糖浆(ES)组,每组20只,对MO组、NAC组、ES组进行支气管哮喘建模,建模成功后,NAC组、ES组每天分别于腹腔内注射2 ml N-乙酰半胱氨酸注射液、急支糖浆灌胃10 g/kg剂量,NO组、MO组同期灌胃同体积生理盐水,通过苏木素-伊红(HE)染色法检测肺组织病理形态、酶联免疫吸附试验(ELISA)、实时荧光定量聚合酶链反应(RT-PCR)、Western印迹检测血清及肺组织中CXCL8、CXCR1、CXCR2、TRPV1含量、mRNA及蛋白表达,并分析N-乙酰半胱氨酸对支气管哮喘大鼠CXCL8-CXCR1/2及TRPV1神经元敏感性。结果与NO组相比,MO组咳嗽次数明显增加(P<0.05),而NAC组、ES组与MO组相比,其咳嗽次数明显降低(P<0.05),且NAC组比ES组降低明显(P<0.05);与NO组相比,MO组细支气管管腔、肺泡腔内可见渗出液、脱落的上皮细胞等,远端肺泡可见局部肺不张及周围肺大泡,且肺间质明显增厚,炎性细胞浸润明显,而与MO组比较,ES组、NAC组症状明显减少,部分肺间质的组织结构趋向正常,部分肺泡轻度扩张,且NAC组比ES组明显降低(P<0.05);与NO组对比,MO组CXCL8、CXCR1、CXCR2、TRPV1含量、mRNA及蛋白表达均明显升高(P<0.05),NAC组、ES组与MO组相比均显著降低(P<0.05),且NAC组比ES组明显降低(P<0.05)。结论N-乙酰半胱氨酸可以显著降低咳嗽次数,减少支气管哮喘症状,可使CXCL8-CXCR1/2及TRPV1神经元敏感性显著降低。展开更多
基金Funded by the 2021 Strategic Cooperation Project between Sichuan University and The People's Government of Zigong(No.2021CDZG-1)Major Science and Technology Research Projects of Panxi,Sichuan Province(No.2022PXZB-04)。
文摘WC-10Co cemented carbides with finer WC and narrower grain size distributions are produced by using(Cr,V)_(2)(C,N)as grain growth inhibitors.As a result,with the increase of(Cr_(0.9),V_(0.1))_(2)(C,N)and(V_(0.9),Cr_(0.1))_(2)(C,N),the grains size of WC and mean free path of Co phase decrease,and adjacency of WC increases.Refinement and homogenization of grains enhance the transverse rupture strength(TRS)and the hardness.Meanwhile,the deflection and bridging of cracks keep the fracture toughness at a respectable level.The WC-10Co-0.6(Cr_(0.9),V_(0.1))_(2)(C,N)-0.025(V_(0.9),Cr_(0.1))_(2)(C,N)cemented carbides exhibit excellent comprehensive mechanical properties with the TRS of 4602.6 MPa,hardness of 1835 kg/mm^(2),and fracture toughness of 10.39 MPa·m^(1/2),respectively.However,the large pores are caused by excess N larger than 0.03 wt%and deteriorates the mechanical properties.We provide a new approach to WC-Co cemented carbides preparation with a narrow grain size distribution by adding novel grain growth inhibitors.
基金supported by the STI 2030-Major Projects 2022ZD0208500(to DY)the National Natural Science Foundation of China,Nos.82072011(to YX),82121003(to DY),82271120(to YS)+2 种基金Sichuan Science and Technology Program,No.2022ZYD0066(to YS)a grant from Chinese Academy of Medical Science,No.2019-12M-5-032(to YS)the Fundamental Research Funds for the Central Universities,No.ZYGX2021YGLH219(to KC)。
文摘Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the primary visual cortex(V1)is altered in glaucoma.This study used DBA/2J mice as a model for spontaneous secondary glaucoma.The aim of the study was to compare the electrophysiological and histomorphological chara cteristics of neurons in the V1between 9-month-old DBA/2J mice and age-matched C57BL/6J mice.We conducted single-unit recordings in the V1 of light-anesthetized mice to measure the visually induced responses,including single-unit spiking and gamma band oscillations.The morphology of layerⅡ/Ⅲneurons was determined by neuronal nuclear antigen staining and Nissl staining of brain tissue sections.Eighty-seven neurons from eight DBA/2J mice and eighty-one neurons from eight C57BL/6J mice were examined.Compared with the C57BL/6J group,V1 neurons in the DBA/2J group exhibited weaker visual tuning and impaired spatial summation.Moreove r,fewer neuro ns were observed in the V1 of DBA/2J mice compared with C57BL/6J mice.These findings suggest that DBA/2J mice have fewer neurons in the VI compared with C57BL/6J mice,and that these neurons have impaired visual tuning.Our findings provide a better understanding of the pathological changes that occur in V1 neuron function and morphology in the DBA/2J mouse model.This study might offer some innovative perspectives regarding the treatment of glaucoma.
文摘目的探究N-乙酰半胱氨酸对支气管哮喘大鼠CXC趋化因子配体(CXCL)8-CXC趋化因子受体(CXCR)1/2及瞬时受体电位通道蛋白(TRP)V1神经元敏感性的影响。方法选取80只SPF级SD雄性大鼠,随机分为正常(NO)组、模型(MO)组、N-乙酰半胱氨酸(NAC)组、急支糖浆(ES)组,每组20只,对MO组、NAC组、ES组进行支气管哮喘建模,建模成功后,NAC组、ES组每天分别于腹腔内注射2 ml N-乙酰半胱氨酸注射液、急支糖浆灌胃10 g/kg剂量,NO组、MO组同期灌胃同体积生理盐水,通过苏木素-伊红(HE)染色法检测肺组织病理形态、酶联免疫吸附试验(ELISA)、实时荧光定量聚合酶链反应(RT-PCR)、Western印迹检测血清及肺组织中CXCL8、CXCR1、CXCR2、TRPV1含量、mRNA及蛋白表达,并分析N-乙酰半胱氨酸对支气管哮喘大鼠CXCL8-CXCR1/2及TRPV1神经元敏感性。结果与NO组相比,MO组咳嗽次数明显增加(P<0.05),而NAC组、ES组与MO组相比,其咳嗽次数明显降低(P<0.05),且NAC组比ES组降低明显(P<0.05);与NO组相比,MO组细支气管管腔、肺泡腔内可见渗出液、脱落的上皮细胞等,远端肺泡可见局部肺不张及周围肺大泡,且肺间质明显增厚,炎性细胞浸润明显,而与MO组比较,ES组、NAC组症状明显减少,部分肺间质的组织结构趋向正常,部分肺泡轻度扩张,且NAC组比ES组明显降低(P<0.05);与NO组对比,MO组CXCL8、CXCR1、CXCR2、TRPV1含量、mRNA及蛋白表达均明显升高(P<0.05),NAC组、ES组与MO组相比均显著降低(P<0.05),且NAC组比ES组明显降低(P<0.05)。结论N-乙酰半胱氨酸可以显著降低咳嗽次数,减少支气管哮喘症状,可使CXCL8-CXCR1/2及TRPV1神经元敏感性显著降低。
