检索结果-南通市图书馆

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

古尼拟青霉的毒理及药用价值研究概况

贵州农业科学 2009年第1期37卷 87-89页

作者：何劲雷帮星文庭池康冀川梁宗琦贵州大学贵州贵阳550025 贵州省农业生物工程重点实验室贵州贵阳550025 贵州省生化工程中心贵州贵阳550025

对古尼拟青霉的毒性、致畸、致突变和药用价值的研究进行了概述。研究表明,古尼拟青霉无致畸、致突变作用,属无毒性类物质,并具有多种药用功能:镇静、镇痛、调节机体免疫力、抗衰老、抗癌、增强记忆、预防和治疗高脂血症、抗心律失常、... 详细信息

对古尼拟青霉的毒性、致畸、致突变和药用价值的研究进行了概述。研究表明,古尼拟青霉无致畸、致突变作用,属无毒性类物质,并具有多种药用功能:镇静、镇痛、调节机体免疫力、抗衰老、抗癌、增强记忆、预防和治疗高脂血症、抗心律失常、降低心肌耗氧、耐急性缺氧等。古尼拟青霉的药用价值及开发前景值得关注,有待深入研究。

关键词：古尼拟青霉古尼虫草毒理药理药用价值

一株蝉拟青霉产N^6-(2-羟乙基)腺苷静置发酵条件的研究

在线全文

学校读者我要写书评

暂无评论

菌物学报 2017年第10期36卷 1415-1426页

作者：雷帮星康冀川何劲文庭池钱一鑫何珺贵州大学西南药用生物资源教育部工程研究中心贵州贵阳550025 贵阳学院贵州贵阳550005

为了提高蝉拟青霉122菌株中N^6‐(2‐羟乙基)腺苷(HEA)的产量。采用静置液体培养方法,以HEA产量为指标,筛选得到122菌株在查氏培养基上的HEA产量优于沙氏和PD培养基;以查氏培养基为基础培养基,在26℃培养40d时,HEA产量达到最大;在黑暗... 详细信息

为了提高蝉拟青霉122菌株中N^6‐(2‐羟乙基)腺苷(HEA)的产量。采用静置液体培养方法,以HEA产量为指标,筛选得到122菌株在查氏培养基上的HEA产量优于沙氏和PD培养基;以查氏培养基为基础培养基,在26℃培养40d时,HEA产量达到最大;在黑暗条件培养优于光照条件培养;最优碳源是蔗糖和葡萄糖;最优氮源是磷酸氢二铵;最优无机盐是KH_2PO_4;最优前体物为次黄嘌呤;最适氨基酸为L‐谷氨酸。正交实验结果表明蔗糖是影响122菌株产HEA的最主要的因子,在筛选出的优化培养基上得到122菌株HEA的最大产量为(130.22±0.60)mg/L,较优化前HEA的产量提高9.73倍。

关键词：蝉拟青霉 N^6-(2-羟乙基)腺苷静置发酵前体物氨基酸

在线全文

学校读者我要写书评

暂无评论

石斛内生真菌的研究概述

山地农业生物学报 2005年第5期24卷 438-441,470页

作者：张延威康冀川贵州大学农业生物工程省级重点实验室贵州贵阳550025

目前从石斛Dendrobium分离并鉴定出的内生真菌分别属于担子菌亚门Basid iomycotina和半知菌亚门Deuteromycotina的17个属。研究发现石斛内生真菌具有促进石斛种子萌发和植株生长的作用。另外,对石斛小菇的药理活性和化学成分的初步研究... 详细信息

目前从石斛Dendrobium分离并鉴定出的内生真菌分别属于担子菌亚门Basid iomycotina和半知菌亚门Deuteromycotina的17个属。研究发现石斛内生真菌具有促进石斛种子萌发和植株生长的作用。另外,对石斛小菇的药理活性和化学成分的初步研究也有所报道。本文对石斛内生真菌的研究进展进行了概述。

关键词：石斛内生真菌药理活性生理活性分离鉴定

Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 755-758页

作者： Qinglin Zhang kang Liang Chang Guo Hefei National Research Center for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of ChinaHefei 230026China

Electrosynthesis has gained widespread recognition for its extraordinary ability to precisely control the redox *** outstanding capability enables the direct conversion of non-functionalized substrates into reactive intermediates by utilizing easily accessible starting materials, eliminating the need for preliminary functionalization procedures and allowing for unconventional bond activations.

关键词： Confluence of asymmetric catalysis and electrosynthesis in sustainable chemical transformations

在线全文

学校读者我要写书评

暂无评论

古尼虫草胞内多糖高产培养基优化研究

菌物学报 2016年第2期35卷 199-208页

作者：孟泽彬文庭池雷帮星高启煜田鑫康冀川贵州大学西南药用生物资源教育部工程研究中心贵州贵阳550025 贵州师范学院贵州省生物资源开发利用特色重点实验室贵州贵阳550018

以古尼虫草Cordyceps gunnii胞内多糖产量为目标,利用单因素法筛选古尼虫草产胞内多糖的最适碳源、氮源和无机盐,运用正交试验筛选最佳培养基组合,用最佳培养基研究古尼虫草产胞内多糖的发酵动力学。结果表明:古尼虫草产胞内多糖最佳培... 详细信息

以古尼虫草Cordyceps gunnii胞内多糖产量为目标,利用单因素法筛选古尼虫草产胞内多糖的最适碳源、氮源和无机盐,运用正交试验筛选最佳培养基组合,用最佳培养基研究古尼虫草产胞内多糖的发酵动力学。结果表明:古尼虫草产胞内多糖最佳培养基为葡萄糖35g/L、蛋白胨15g/L、硫酸锌1g/L、KH2PO4 1g/L、K2HPO4 0.5g/L,用最佳培养基获得胞内多糖(5.169±0.274)g/L,产量是优化前的1.81倍;动力学研究表明,144h是古尼虫草胞内多糖最佳培养时间,此时产量最高为(6.794±0.221)g/L,是目前报道古尼虫草胞内多糖的最高产量。

关键词：古尼虫草胞内多糖培养基优化动力学

在线全文

学校读者我要写书评

暂无评论

贵州马比木内生真菌的多样性研究

菌物学报 2018年第1期37卷 43-51页

作者：谯利军周思旋文庭池康冀川雷帮星贵州大学西南药用生物资源教育部工程研究中心贵州贵阳550025 贵州健康职业学院贵州铜仁554300 贵州省畜牧兽医研究所贵州贵阳550005

为了解贵州省马比木内生真菌的多样性,通过采集贵阳修文、遵义播州、铜仁万山3个县区的不同季节的健康马比木植物不同组织部位样本进行内生真菌的分离,分析分离菌ITS r DNA序列,采用分子系统学方法,对3个地区的不同季节马比木植物不同... 详细信息

为了解贵州省马比木内生真菌的多样性,通过采集贵阳修文、遵义播州、铜仁万山3个县区的不同季节的健康马比木植物不同组织部位样本进行内生真菌的分离,分析分离菌ITS r DNA序列,采用分子系统学方法,对3个地区的不同季节马比木植物不同组织部位的内生真菌进行鉴定、归类,并进行多样性评价。结果表明,从1 444个马比木组织块中分离出1 037株内生真菌,分别隶属于30个属,其中间壳座属Diaporthe为优势属,分离率与分离频率分别为40.24%与57.58%;夏季内生真菌的多样性指数最高,4个季节的相似度在0.40–0.71之间,贵阳的相似性指数最高,三地的相似性指数在0.42–0.55之间,果实的多样性指数最高,各个组织部位的相似性指数在0.00–0.54之间。表面植株生长环境及部位对内生真菌的组成和多样性均有影响。

关键词：内生真菌分离鉴定多样性

Recent development and challenges in enhancing fire performance on wood and wood-based composites:A 10-year review from 2012 to 2021

在线全文

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2024年第1期9卷 27-42页

作者： Charles Michael Albert kang Chiang Liew Faculty of Tropical Forestry Universiti Malaysia SabahKota Kinabalu 88400Kota KinabaluSabah 88400Malaysia

Due to their durability,versatility,and aesthetic value,wood and wood-based composites are widely used as building *** fact that these materials are flammable,however,raises a major worry since they might cause fire hazards and significant loss of life and *** article investigates the variables that affect fire performance as well as the various fire-retardant treatments and their *** current developments and challenges in improving the fire performance of wood and wood-based composites treated with fire-retardant materials are summarized in this ***,organic chemicals,and densification are some recent developments in fire-retardant treatments that are also *** points from the review are summarized,along with potential areas for further research and development.

关键词： Fire performance Fire-retardant materials Wood Wood-based composite Nanoparticles coating Surface charring Bio-based fire retardant Densification

Jackknife Model Averaging for Composite Quantile Regression

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第4期37卷 1604-1637页

作者： YOU kang WANG Miaomiao ZOU Guohua School of Mathematical Sciences Capital Normal UniversityBeijing 100089China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 100105China

In this paper,the authors propose a frequentist model averaging method for composite quantile regression with diverging number of *** from the traditional model averaging for quantile regression which considers only a single quantile,the proposed model averaging estimator is based on multiple *** well-known delete-one cross-validation or jackknife approach is applied to estimate the model *** resultant jackknife model averaging estimator is shown to be asymptotically optimal in terms of minimizing the out-of-sample composite final prediction *** studies are conducted to demonstrate the finite sample performance of the new model averaging *** proposed method is also applied to the analysis of the stock returns data and the wage data.

关键词： Asymptotic optimality composite quantile regression cross-validation model averaging

Optimization-based mode selection scheme for OAM millimeter wave system in the off-axis misalignment case

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第1期10卷 101-108页

作者： Haie Dou Lei Wang Bin kang Baoyu Zheng Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing210003China School of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing210003China

Millimeter-wave transmission combined with Orbital Angular Momentum(OAM)has the advantage of reducing the loss of beam power and increasing the system ***,to fulfill this advantage,the antennas at the transmitter and receiver must be parallel and coaxial;otherwise,the accuracy of mode detection at the receiver can be seriously *** this paper,we design an OAM millimeter-wave communication system for overcoming the above ***,the first contribution is that the power distribution between different OAM modes and the capacity of the system with different mode sets are analytically derived for performance *** second contribution lies in that a novel mode selection scheme is proposed to reduce the total interference between different *** results show that system performance is less affected by the offset when the mode set with smaller modes or larger intervals is selected.

关键词： Orbital angular momentum Millimeter wave Off-axis misalignment Mode selection Capacity