目的研究miRNA-34a、沉默信息调节因子(Silent information regulator,SIRT6)对老龄小鼠听觉皮层神经元细胞凋亡的影响及机制。方法miRNA-34a基因敲除小鼠(miRNA-34a敲除组)、SIRT6基因敲除小鼠(SIRT6敲除组)与野生型小鼠(对照组)各10只...目的研究miRNA-34a、沉默信息调节因子(Silent information regulator,SIRT6)对老龄小鼠听觉皮层神经元细胞凋亡的影响及机制。方法miRNA-34a基因敲除小鼠(miRNA-34a敲除组)、SIRT6基因敲除小鼠(SIRT6敲除组)与野生型小鼠(对照组)各10只,所有小鼠均为16月龄,TUNEL法分别检测各组小鼠听觉皮层神经元细胞凋亡情况,免疫组化法检测各组小鼠听觉皮层神经元中B细胞淋巴瘤-2(B-cell lymphoma-2,Bcl-2)、Bcl-2相关的x蛋白(B-cell lymphoma-2 associated X protein,Bax)、半胱氨酸天冬氨酸蛋白酶8(Cysteine aspartic protease8,Caspase8)、半胱氨酸天冬氨酸蛋白酶3(Cysteine aspartic protease3,Caspase3)表达情况。结果miRNA-34a敲除组小鼠听觉皮层神经元细胞凋亡指数与SIRT6组相比,差异有统计学意义(P<0.05),miRNA-34a敲除组与对照组相比,差异无统计学意义(P>0.05),SIRT6敲除组与对照组相比,差异有统计学意义(P<0.05);miRNA-34a敲除组小鼠听觉皮层神经元抑凋亡因子Bcl-2表达量与SIRT6敲除组相比,差异有统计学意义(P<0.05),miRNA-34a敲除组与对照组相比,差异无统计学意义(P>0.05),SIRT6敲除组与对照组相比,差异有统计学意义(P<0.05);miRNA-34a敲除组小鼠听觉皮层神经元促凋亡因子Bax、Caspase8、Caspase3表达量与SIRT6敲除组相比,差异有统计学意义(P<0.05),miRNA-34a敲除组与对照组相比,差异无统计学意义(P>0.05),SIRT6敲除组与对照组相比,差异有统计学意义(P<0.05)。结论miRNA-34a与SIRT6可通过多种凋亡因子调控老龄小鼠听觉皮层神经元细胞凋亡过程;miRNA-34a促进其凋亡,而SIRT6抑制小鼠听觉皮层神经元细胞凋亡;miRNA-34a与SIRT6在调控小鼠听觉皮层神经元凋亡中负相关,二者可能是治疗老年性耳聋的新靶点。展开更多
On the basis of investigating rural population, land types, livestock and poultry breeding scale in drinking water conservation area of the Hongfeng Lake in Guiyang City, as well as the urban domestic pol utant discha...On the basis of investigating rural population, land types, livestock and poultry breeding scale in drinking water conservation area of the Hongfeng Lake in Guiyang City, as well as the urban domestic pol utant discharge coefficient, livestock and poultry excretion coefficient, nitrogen fertilizer and phosphate fertilizer loss rate in the first national pollution source survey, this paper tried to explore current situation of agricultural non-point source pollution, and provide scientific support for the pollution control. The results showed that in the drinking water conservation area of the Hongfeng lake in 2013, contribution rate of pollution sources to the water pollution in the Hongfeng Lake followed the sequence "livestock and poultry breeding > rural life > farmland fertilizer". Among all agricultural non-point source pollutants, livestock and poultry breeding pollutants were major pollution sources, with a contribution rate to CODCr, TP and NH3-N in water above 50%; rural domestic pollutants were also important pollution sources, its contribution rate to CODCr and NH3-N was 43.49% and 46.69%, respectively; contribution rate of farmland fertilizer pollutants to TN and TP was 33.76% and 27.71%, respectively, higher than that of rural domestic pollutants(25.87% and 6.75%). Therefore, the control of non-point source pollution within the drinking water conservation area should be enhanced, so as to control the pollution from the source.展开更多
An accurate photodiode circuit macro-model is proposed for SPICE simulation. The definition and implementation of the macro-model is based on carrier stationary continuity equation. In this macro-model, the photodiode...An accurate photodiode circuit macro-model is proposed for SPICE simulation. The definition and implementation of the macro-model is based on carrier stationary continuity equation. In this macro-model, the photodiode is a device of three pins, one for light intensity input and the other two for photocurrent output, which represent the relationship between photocurrent and incident light. The validity of the proposed macro-model is demonstrated with its PSPICE simulation result compared with reported experimental data.展开更多
在复杂声音场景,尤其是多人对话交谈的情况中,人工耳蜗佩戴者的言语可懂度会显著下降。该文提出了一种基于近距离双麦克风的语音增强算法,通过提取采集信号的延迟参数,并根据该参数设置掩蔽矩阵,进而区分不同方位的声源,抑制竞争性语音...在复杂声音场景,尤其是多人对话交谈的情况中,人工耳蜗佩戴者的言语可懂度会显著下降。该文提出了一种基于近距离双麦克风的语音增强算法,通过提取采集信号的延迟参数,并根据该参数设置掩蔽矩阵,进而区分不同方位的声源,抑制竞争性语音噪声。同时还以数字信号处理器(digital signal processor, DSP)为核心,搭建调试平台,对算法进行了工程实现。实际测试表明,算法提升了前端信号的信噪比,鲁棒性强,并且算法单帧运行时间短,可以和常用的人工耳蜗言语编码策略相融合,满足人工耳蜗的实时计算需求。展开更多
基金Sponsored by Significant Scientific and Technological Program of Guizhou Province([2015]2001)
文摘On the basis of investigating rural population, land types, livestock and poultry breeding scale in drinking water conservation area of the Hongfeng Lake in Guiyang City, as well as the urban domestic pol utant discharge coefficient, livestock and poultry excretion coefficient, nitrogen fertilizer and phosphate fertilizer loss rate in the first national pollution source survey, this paper tried to explore current situation of agricultural non-point source pollution, and provide scientific support for the pollution control. The results showed that in the drinking water conservation area of the Hongfeng lake in 2013, contribution rate of pollution sources to the water pollution in the Hongfeng Lake followed the sequence "livestock and poultry breeding > rural life > farmland fertilizer". Among all agricultural non-point source pollutants, livestock and poultry breeding pollutants were major pollution sources, with a contribution rate to CODCr, TP and NH3-N in water above 50%; rural domestic pollutants were also important pollution sources, its contribution rate to CODCr and NH3-N was 43.49% and 46.69%, respectively; contribution rate of farmland fertilizer pollutants to TN and TP was 33.76% and 27.71%, respectively, higher than that of rural domestic pollutants(25.87% and 6.75%). Therefore, the control of non-point source pollution within the drinking water conservation area should be enhanced, so as to control the pollution from the source.
基金National Natural Science Foundation of China(30470469)
文摘An accurate photodiode circuit macro-model is proposed for SPICE simulation. The definition and implementation of the macro-model is based on carrier stationary continuity equation. In this macro-model, the photodiode is a device of three pins, one for light intensity input and the other two for photocurrent output, which represent the relationship between photocurrent and incident light. The validity of the proposed macro-model is demonstrated with its PSPICE simulation result compared with reported experimental data.
文摘在复杂声音场景,尤其是多人对话交谈的情况中,人工耳蜗佩戴者的言语可懂度会显著下降。该文提出了一种基于近距离双麦克风的语音增强算法,通过提取采集信号的延迟参数,并根据该参数设置掩蔽矩阵,进而区分不同方位的声源,抑制竞争性语音噪声。同时还以数字信号处理器(digital signal processor, DSP)为核心,搭建调试平台,对算法进行了工程实现。实际测试表明,算法提升了前端信号的信噪比,鲁棒性强,并且算法单帧运行时间短,可以和常用的人工耳蜗言语编码策略相融合,满足人工耳蜗的实时计算需求。
