在神经美学研究中已经证明,中文字体审美偏好的情绪刺激可以通过观察3种偏好(喜欢、不喜欢和中性)之间的事件相关电位(event related potential,ERP)波动获得.本文通过引入一种核化张量奇异值分解的多视角聚类方法分别构建了基于脑电图(...在神经美学研究中已经证明,中文字体审美偏好的情绪刺激可以通过观察3种偏好(喜欢、不喜欢和中性)之间的事件相关电位(event related potential,ERP)波动获得.本文通过引入一种核化张量奇异值分解的多视角聚类方法分别构建了基于脑电图(electroencephalogram,EEG)和ERP的审美偏好识别模型,通过这些模型首次确认了该结论.本文方法将来自不同频段的数据视为描述中文字体审美偏好的不同视角,通过张量多秩最小化的约束探索所有视角特征的一致性和关联性,并通过之后的聚类获取审美偏好的识别结果.采用多视角无监督聚类方法得到的识别精度达到97.1%.此外,通过输入–扰动关联方法将电极的振幅与不同种类的审美偏好相关联,可视化关键频段组合以及电极之间的关系,分别取出与喜欢、不喜欢、中性最相关的3个电极,包含次相关的6个电极,包含第三相关的9个电极,包含第四相关的12个电极,分别形成4种不同组合的脑电特征.通过比较实验,验证了相对于62个电极信号,上述4种组合方式在字体美学分类上更具有优势,并且最相关的3个电极的组合特征对审美偏好最具判别性.实验结果表明,基于多视角聚类的方法能够解决神经信号与审美偏好的相关分析,并能挖掘出与字体审美偏好最相关的电极.展开更多
目的克隆、表达屋尘螨3类变应原(Der p 3)基因,纯化Der p 3重组蛋白,对其免疫原性及生物信息学特点进行分析。方法取实验室纯培养的屋尘螨500只,提取总RNA,逆转录生成cDNA, RT鄄PCR扩增Der p 3基因。扩增的Der p 3基因经测序正确后,将...目的克隆、表达屋尘螨3类变应原(Der p 3)基因,纯化Der p 3重组蛋白,对其免疫原性及生物信息学特点进行分析。方法取实验室纯培养的屋尘螨500只,提取总RNA,逆转录生成cDNA, RT鄄PCR扩增Der p 3基因。扩增的Der p 3基因经测序正确后,将目的条带连接至pMD鄄32T载体中进行扩增,并利用限制性内切酶Eco RⅠ和XhoⅠ双酶切,酶切后的片段连接至pET鄄32a表达载体,转化至大肠埃希菌Rosetta中,经1 mmol/L异丙基鄄β鄄D鄄硫代半乳糖苷(IPTG)诱导表达后,蛋白质印迹(Western boltting)分析重组蛋白的免疫原性。分别采用BLAST、 ProtParam、 PSIPRED、 SWISS鄄MODEL对重组蛋白的同源性、理化性质、二级结构、三级结构进行分析;通过BLAST和MEGA构建Der p 3的系统进化树;并利用IEBD和DNA Star对Der p 3重组蛋白的抗原表位进行预测。结果RT鄄PCR扩增屋尘螨Der p 3基因,得到约1 000 bp的片段,经测序为Der p 3目的序列,其开放阅读框为786 bp,编码261个氨基酸。经IPTG诱导后大量表达Der p 3重组蛋白。该蛋白主要以包涵体形式存在,相对分子质量(Mr)约30 000。Western blotting分析结果显示,重组蛋白Der p 3能与10份尘螨过敏性哮喘患者血清IgE抗体特异性结合。BLAST和MEGA分析结果显示, Der p 3基因与粉尘螨3类变应原(Der f 3)的序列一致性较高,约80%。Der p 3蛋白较稳定,二级结构由螺旋、延伸链、随机线圈组成;并预测到6个抗原表位肽序列。结论纯化后的Der p 3重组蛋白能与尘螨过敏性哮喘患者血清IgE抗体特异性结合,具有较强免疫原性。展开更多
Despite the fact that some progress has been made in the self-assembly of H-shaped polymers, the corresponding self-assemblies that respond to external stimulus and are further utilized to adjust the release of drugs ...Despite the fact that some progress has been made in the self-assembly of H-shaped polymers, the corresponding self-assemblies that respond to external stimulus and are further utilized to adjust the release of drugs are still deficient. The stimuli-responsive segments with amphiphilic H-shaped structure are generally expected to enhance the controllability of self-assembly process. The synthesis and self-assembly behavior of thermo-responsive amphiphilic H-shaped polymers with poly(ethylene glycol) (PEG), polytetrahydrofuran (PTHF) and poly(N-isopropyl acrylamide) (PNIPAM) as building blocks are reported in this paper. The inner architecture structure and size of complex micelles formed by H-shaped self-assemblies were effectively adjusted when the solution temperature was increased above the lower critical solution temperature of PNIPAM segments. Furthermore, it was found that the architecture of self-assemblies underwent a transition from the complex micelles based on primary micelles with hybrid PEG/PNIPAM shells to large complex micelles based on primary micelles with hybrid PTHF/PNIPAM cores and PEG shells during the thermal-induced self-assembly process. The adjustable release rate ofdoxorubicin (DOX) from the DOX-loaded complex micelles and basic cell experiments further proved the feasibility of these self-assemblies as the thermal-responsive drug delivery system.展开更多
目的研究并优化GB 5413.5-2010《食品安全国家标准婴幼儿食品和乳品中乳糖、蔗糖的测定》样品制备步骤,解决婴幼儿配方乳粉中乳糖检测结果偏低的现象,保证乳糖检测的准确性。方法在样品溶液制备过程中,采取30 m L水溶解乳粉,并向容量瓶...目的研究并优化GB 5413.5-2010《食品安全国家标准婴幼儿食品和乳品中乳糖、蔗糖的测定》样品制备步骤,解决婴幼儿配方乳粉中乳糖检测结果偏低的现象,保证乳糖检测的准确性。方法在样品溶液制备过程中,采取30 m L水溶解乳粉,并向容量瓶中加入1 m L 3%的乙酸水溶液协助蛋白沉淀,进而降低乙腈在样品溶液中的利用比例,保证样品制备过程中乳糖的充分溶解,最终通过液相色谱测定。结果同一份样品经不同的样品制备方式,于相同的色谱条件下检测,依据本法制得样品测定结果比遵循国标条件制得样品的结果高出7%,并且结果平行性良好。结论通过方法学研究,证实该方法具有适用性、重复性、准确度以及线性范围良好的特点,并且操作简便,适用于婴幼儿配方乳粉中乳糖的检测。展开更多
目的探讨PCOS患者血清DHEAS与肥胖及代谢异常的关系。方法选择在本院就诊的未经过药物治疗的PCOS患者199例,分别检测其BMI、血清DHEAS及空腹血糖、空腹胰岛素和血脂代谢相关指标,并对其进行统计分析。结果 DHEAS高值组的TT为(63.33±...目的探讨PCOS患者血清DHEAS与肥胖及代谢异常的关系。方法选择在本院就诊的未经过药物治疗的PCOS患者199例,分别检测其BMI、血清DHEAS及空腹血糖、空腹胰岛素和血脂代谢相关指标,并对其进行统计分析。结果 DHEAS高值组的TT为(63.33±24.57)ng/dl,Apo A I为(1.23±0.25)g/L;DHEAS低值组的TT为(54.37±25.52)ng/dl,Apo A I为(1.13±0.26)g/L,2组差异有统计学意义(P<0.05)。血清DHEAS水平与TT、SHBG、HDL-C和Apo A I水平呈正相关(r值分别为0.223、0.194、0.171、0.164,P<0.05),而与Apo B呈负相关(r=-0.150,P<0.05)。结论 DHEAS水平与脂类代谢参数相关联,与肥胖及糖、胰岛素代谢无关。展开更多
文摘在神经美学研究中已经证明,中文字体审美偏好的情绪刺激可以通过观察3种偏好(喜欢、不喜欢和中性)之间的事件相关电位(event related potential,ERP)波动获得.本文通过引入一种核化张量奇异值分解的多视角聚类方法分别构建了基于脑电图(electroencephalogram,EEG)和ERP的审美偏好识别模型,通过这些模型首次确认了该结论.本文方法将来自不同频段的数据视为描述中文字体审美偏好的不同视角,通过张量多秩最小化的约束探索所有视角特征的一致性和关联性,并通过之后的聚类获取审美偏好的识别结果.采用多视角无监督聚类方法得到的识别精度达到97.1%.此外,通过输入–扰动关联方法将电极的振幅与不同种类的审美偏好相关联,可视化关键频段组合以及电极之间的关系,分别取出与喜欢、不喜欢、中性最相关的3个电极,包含次相关的6个电极,包含第三相关的9个电极,包含第四相关的12个电极,分别形成4种不同组合的脑电特征.通过比较实验,验证了相对于62个电极信号,上述4种组合方式在字体美学分类上更具有优势,并且最相关的3个电极的组合特征对审美偏好最具判别性.实验结果表明,基于多视角聚类的方法能够解决神经信号与审美偏好的相关分析,并能挖掘出与字体审美偏好最相关的电极.
文摘目的克隆、表达屋尘螨3类变应原(Der p 3)基因,纯化Der p 3重组蛋白,对其免疫原性及生物信息学特点进行分析。方法取实验室纯培养的屋尘螨500只,提取总RNA,逆转录生成cDNA, RT鄄PCR扩增Der p 3基因。扩增的Der p 3基因经测序正确后,将目的条带连接至pMD鄄32T载体中进行扩增,并利用限制性内切酶Eco RⅠ和XhoⅠ双酶切,酶切后的片段连接至pET鄄32a表达载体,转化至大肠埃希菌Rosetta中,经1 mmol/L异丙基鄄β鄄D鄄硫代半乳糖苷(IPTG)诱导表达后,蛋白质印迹(Western boltting)分析重组蛋白的免疫原性。分别采用BLAST、 ProtParam、 PSIPRED、 SWISS鄄MODEL对重组蛋白的同源性、理化性质、二级结构、三级结构进行分析;通过BLAST和MEGA构建Der p 3的系统进化树;并利用IEBD和DNA Star对Der p 3重组蛋白的抗原表位进行预测。结果RT鄄PCR扩增屋尘螨Der p 3基因,得到约1 000 bp的片段,经测序为Der p 3目的序列,其开放阅读框为786 bp,编码261个氨基酸。经IPTG诱导后大量表达Der p 3重组蛋白。该蛋白主要以包涵体形式存在,相对分子质量(Mr)约30 000。Western blotting分析结果显示,重组蛋白Der p 3能与10份尘螨过敏性哮喘患者血清IgE抗体特异性结合。BLAST和MEGA分析结果显示, Der p 3基因与粉尘螨3类变应原(Der f 3)的序列一致性较高,约80%。Der p 3蛋白较稳定,二级结构由螺旋、延伸链、随机线圈组成;并预测到6个抗原表位肽序列。结论纯化后的Der p 3重组蛋白能与尘螨过敏性哮喘患者血清IgE抗体特异性结合,具有较强免疫原性。
基金financially supported by the National Natural Science Foundation of China(No.21674086)Scientific Research Program Funded by Shaanxi Provincial Education Department(No.17JK0103)
文摘Despite the fact that some progress has been made in the self-assembly of H-shaped polymers, the corresponding self-assemblies that respond to external stimulus and are further utilized to adjust the release of drugs are still deficient. The stimuli-responsive segments with amphiphilic H-shaped structure are generally expected to enhance the controllability of self-assembly process. The synthesis and self-assembly behavior of thermo-responsive amphiphilic H-shaped polymers with poly(ethylene glycol) (PEG), polytetrahydrofuran (PTHF) and poly(N-isopropyl acrylamide) (PNIPAM) as building blocks are reported in this paper. The inner architecture structure and size of complex micelles formed by H-shaped self-assemblies were effectively adjusted when the solution temperature was increased above the lower critical solution temperature of PNIPAM segments. Furthermore, it was found that the architecture of self-assemblies underwent a transition from the complex micelles based on primary micelles with hybrid PEG/PNIPAM shells to large complex micelles based on primary micelles with hybrid PTHF/PNIPAM cores and PEG shells during the thermal-induced self-assembly process. The adjustable release rate ofdoxorubicin (DOX) from the DOX-loaded complex micelles and basic cell experiments further proved the feasibility of these self-assemblies as the thermal-responsive drug delivery system.
文摘目的研究并优化GB 5413.5-2010《食品安全国家标准婴幼儿食品和乳品中乳糖、蔗糖的测定》样品制备步骤,解决婴幼儿配方乳粉中乳糖检测结果偏低的现象,保证乳糖检测的准确性。方法在样品溶液制备过程中,采取30 m L水溶解乳粉,并向容量瓶中加入1 m L 3%的乙酸水溶液协助蛋白沉淀,进而降低乙腈在样品溶液中的利用比例,保证样品制备过程中乳糖的充分溶解,最终通过液相色谱测定。结果同一份样品经不同的样品制备方式,于相同的色谱条件下检测,依据本法制得样品测定结果比遵循国标条件制得样品的结果高出7%,并且结果平行性良好。结论通过方法学研究,证实该方法具有适用性、重复性、准确度以及线性范围良好的特点,并且操作简便,适用于婴幼儿配方乳粉中乳糖的检测。
文摘目的探讨PCOS患者血清DHEAS与肥胖及代谢异常的关系。方法选择在本院就诊的未经过药物治疗的PCOS患者199例,分别检测其BMI、血清DHEAS及空腹血糖、空腹胰岛素和血脂代谢相关指标,并对其进行统计分析。结果 DHEAS高值组的TT为(63.33±24.57)ng/dl,Apo A I为(1.23±0.25)g/L;DHEAS低值组的TT为(54.37±25.52)ng/dl,Apo A I为(1.13±0.26)g/L,2组差异有统计学意义(P<0.05)。血清DHEAS水平与TT、SHBG、HDL-C和Apo A I水平呈正相关(r值分别为0.223、0.194、0.171、0.164,P<0.05),而与Apo B呈负相关(r=-0.150,P<0.05)。结论 DHEAS水平与脂类代谢参数相关联,与肥胖及糖、胰岛素代谢无关。