检索结果-南通市图书馆

The phytochemical, biological, and medicinal attributes of phytoecdysteroids: An updated review

Acta Pharmaceutica Sinica B 2021年第7期11卷 1740-1766页

作者： niranjan das Siddhartha Kumar Mishra Anusha Bishayee Eunüs S.Ali Anupam Bishayee Department of Chemistry Iswar Chandra Vidyasagar CollegeBelonia-799155TripuraIndia Cancer Biology Laboratory Department of ZoologySchool of Biological SciencesDr.Harisingh Gour Central UniversitySagar-470003Madhya PradeshIndia Pine View School OspreyFL 34229USA Department of Biochemistry and Molecular Genetics Feinberg School of MedicineNorthwestern UniversityChicagoIL 60611USA Lake Erie College of Osteopathic Medicine BradentonFL 34211USA

The phytoecdysteroids(PEs)comprise a large group of biologically-active plant steroids,which have structures similar to those of insect-molting hormones.PEs are distributed in plants as secondary metabolites that offer protection against phytophagus(plant-eating)insects.When insects consume the plants containing these chemicals,they promptly molt and undergo metabolic destruction;the insects eventually die.Chemically,ecdysteroids are a group of polyhydroxylated ketosteroids that are structurally similar to androgens.The carbon skeleton of ecdysteroids is termed as cyclopentanoperhydro-phenanthrene with aβ-side chain at carbon-17.The essential characteristics of ecdysteroids are a cis-(5β-H)junction of rings A and B,a 7-en-6-one chromophore,and a trans(14α-OH)junction of rings C and D.Plants only synthesize PEs from mevalonic acid in the mevalonate pathway of the plant cell using acetyl-CoA as a precursor;the most common PE is 20-hydroxyecdysone.So far,over 400 PEs have been identified and reported,and a compilation of 166 PEs originating from 1998 has been previously reviewed.In the present review,we have summarized 212 new PEs reported between 1999 and 2019.We have also critically analyzed the biological,pharmacological,and medicinal properties of PEs to understand the full impact of these phytoconstituents in health and disease.

关键词： Phytoecdysteroids Secondary metabolites Antioxidant Anti-inflammatory Antimicrobial Antidiabetic Anticancer activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Impact of reducing and capping agents on carbohydrates for the growth of Ag and Cu nanostructures and their antibacterial activities

引用

Particuology 2019年第2期17卷 219-226页

作者： Rayees Ahmad Rather Ramandeep K. Sarwara niranjan das Bonamali Pal School of Chemistry and Biochemistry Thapar Institute of Engineering and Technology Patiala 147004 Punjab India Department of Biotechnology Thapar Institute of Engineering and Technology Patiala 147004 Punjab India

This study presents a viable green synthesis approach to produce Ag and Cu nanoparticles (MNPs) by using carbohydrates such as glucose, fructose, sucrose, and starch as reducing agents and describes theirantimicrobial activities against Escherichia coli DH5a. Optical and diffused light scattering analyses showed the Ag NPs ranged from 20 to 75 nm and the Cu NPs varied from 20 to 160 nm, which supports the differences in their absorption bands (400-434 nm for Ag and 458-641 nm for Cu). The reducing sugars interacted differently with Ag^+ and Cu^2+ based on their size and hydrolysis by NaOH resulting in effective stabilization of Ag^0 and Cu^0 and variation in the bactericidal activities of the MNPs. The antibacterial effects of the MNPs were evaluated by measuring the inhibition zones using E. coli DH5a as a test organism. No growth was observed by restreaking different parts of the clearly inhibited zones into new culture plates indicating the bactericidal efficacy of the Ag and Cu MNPs. The Ag NPs were found to be more effective in terms of the size of their in hibition zones (1.21-1.82 cm) compared with those of the Cu NPs (0.0-1.2 cm). This study provides a promising basis for the formulation of a new gen eration of bactericidal agents.

关键词： Green synthesis Ag and Cu nanoparticles Carbohydrate reducing agents Antibacterial activities

来源：

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

Evaluation of regression algorithms for estimating leaf area index and canopy water content from water stressed rice canopy reflectance

引用

Information Processing in Agriculture 2021年第2期8卷 284-298页

作者： niranjan Panigrahi Bhabani Sankar das Agricultural and Food Engineering Department Indian Institute of Technology KharagpurWest Bengal 721302India School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUK

Optical remote sensing(RS)with robust algorithms is needed for accurate assessment of crop canopy features.Despite intensive studies on algorithms,their performance using RS needs to be improved.We evaluated five different algorithms(partial-least-squares regression(PLSR),support vector regression(SVR),random forest regression(RFR),locally-weighted-PLSR(PLSRLW)and PLSR with feature selection(PLSRFS))for rapid assessment of leaf area index(LAI)and canopy water content(CWC)for rice canopies using canopy reflectance spectra over visible to short-wave infrared region.Two pooled datasets of LAI(600)and CWC(480)were collected from two replicated field experiments during 2014–15 and 2015–16 rice growing season.The performance of each algorithm was evaluated using coefficient of determination(R^(2)).Results showed that PLSRLW performed more accurately than other algorithms with R^(2) values 0.77 and 0.66 for LAI and CWC,respectively.We also used a bootstrapping approach to generate a kernel density estimator of root mean squared error values for each model.The results suggested that the improvement in prediction accuracy of LAI and CWC can be achieved if a suitable algorithm is selected by assigning higher weights to calibration samples,which has similar canopy structure as the test sample.Subsetting of the canopy spectral data results large error values in test dataset,therefore the use of entire season canopy spectral data should be used for model calibration.

关键词： Rice canopy Reflectance spectroscopy Calibration Retrieval algorithms Partial-least-squares regression

来源：

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

“Kill-TB” Drug Reminder Mobile Application for Tuberculosis Patients at Bengaluru, India: Effectiveness and Challenges

引用

Journal of Tuberculosis Research 2020年第1期8卷 1-10页

作者： Sharath Burugina Nagaraja Naveen Kotur niranjan Murthy Shilpashree Madhava Kunjathur Nanda Sappandi Deepak Murthy Arundathi das Anil Singarajipur Employee’s State Insurance Corporation Medical College and Post Graduate Institute of Medical Sciences and Research Bengaluru India BGS Global Institute of Medical Sciences Bengaluru India Bangalore Medical College and Research Institute Bengaluru India District Tuberculosis Office Bengaluru India State Tuberculosis Office Bengaluru India

Background: Tuberculosis remains a major public health problem in India. Newer digital technologies for treatment adherence have been tested for diseases with chronic medication. A mobile application (Kill-TB) that provides reminder to TB patients through alarm was tested for its effectiveness and challenges under programmatic settings. Methods: A cohort of TB patients initiated on treatment with and without mobile application at Bangalore city during January-March 2019 was observed for missed doses during their treatment period. Results: A total of 694 patients (347 patients with and without mobile application) were enrolled for the study. Among the patients with and without mobile application 1) loss to follow-up was 2% and 8%, 2) non-adherence rate to TB treatment was 1.5 and 3.3 per 100 person-months, 3) treatment success rate was 89% and 81%. Conclusion: The TB drug reminder mobile application benefits the patient’s treatment adherence and paves way for improved treatment outcomes despite the challenges in implementation. The programme should leverage mobile technologies as an additional monitoring tool to achieve the target of End-TB by 2025.

关键词： Kill-TB Tuberculosis India Mobile Application

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：