检索结果-南通市图书馆

Effect of various aromatic compounds with different functional groups on enzymatic hydrolysis of microcrystalline cellulose and alkaline pretreated wheat straw

引用

Journal of Bioresources and Bioproducts 2024年第2期9卷 211-221页

作者： Yufeng Yuan Xinyu Guo Bo Jiang Wenjuan Wu Tingwei Zhang Michael Sweeney mehraj ahmad Yongcan Jin Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Pulp and Paper Science and TechnologyNanjing Forestry UniversityNanjing 210037China School of Chemistry and Chemical Engineering Queen’s University BelfastBelfast BT71NNNorthern Ireland United Kingdom Department of Food Science and Engineering College of Light Industry and Food EngineeringNanjing Forestry UniversityNanjing 210037China

Low molecular aromatic compounds are detrimental to the enzymatic hydrolysis of lignocellu-lose.However,the specific role of their functional groups remains unclear.Here,a series of nine aromatic compounds as additives were tested to understand their effect on the hydrolysis yield of microcrystalline cellulose(MCC)and alkaline pretreated wheat straw.Based on the results,the inhibition of aldehyde groups on MCC was greater than that of carboxyl groups,whereas for the alkaline pretreated wheat straw case,the inhibitory effect of aldehyde groups was lower than that of carboxyl groups.Increased methoxyl groups of aromatic compounds reduced the inhibitory ef-fect on enzymatic hydrolysis of both substrates.Stronger inhibition of aromatic compounds on MCC hydrolysis was detected in comparison with the alkaline pretreated wheat straw,indicating that the substrate lignin can offset the inhibition to a certain extent.Among all aromatic com-pounds,syringaldehyde with one aldehyde group and two methoxyl groups improved the glucan conversion of the alkaline pretreated wheat straw.

关键词： Aromatic compound Functional group Enzymatic hydrolysis Alkaline pretreated wheat straw Microcrystalline cellulose

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

Papaya peel waste carbon dots/reduced graphene oxide nanocomposite:From photocatalytic decomposition of methylene blue to antimicrobial activity

引用

生物质资源与工程(英文) 2023年第2期8卷 162-175页

作者： Hesam Salimi Shahraki Rani Bushra Nimra Shakeel Anees ahmad Quratulen mehraj ahmad Christos Ritzoulis Department of Food Science and Technology International Hellenic UniversityThessaloniki 57400Greece Department of Chemistry Aligarh Muslim UniversityAligarh 202002India Department of Food Science and Engineering College of Light Industry and FoodNanjing Forestry UniversityNanjing 210037China

Carbon dots(CDs)have gained unprecedented attention as a novel luminescent zero-dimensional carbon nanomaterial owing to their diverse industrial applications.Herein,we reported the sus-tainable synthesis of fluorescent CDs from papaya peel waste,acting as a natural carbon orig-inator.As-prepared CDs and reduced graphene oxide(RGO)were fabricated in the composites through a facile one-step hydrothermal method.Synthesized RGO/CDs(RC)nanocomposites were characterized using spectroscopic,diffraction,and electron-microscopic ***-posites with variable RGO to CD mass ratios were tested for photodegradation of textile dye methylene blue(MB).The highest photocatalytic activity(degradation efficiency of 87%in 135 min)was obtained in the nanocomposite containing a 2꞉1 mass ratio(RC2).The RGO sheets in the nanocomposite acted as media for electron acceptors,promoting the fast transfer and sep-aration of photoinduced electrons during CDs excitation,thus preventing the recombination of the electron and holes.Based on the agar well diffusion assay,the nanocomposites exhibited ex-cellent antibacterial activity than other tested materials against Bacillus subtilis(Gram-positive)and Pseudomonas aeruginosa(Gram-negative)bacterium.The largest inhibition zone area(22 mm),i.e.,the highest antimicrobial activity,was obtained in the nanocomposite tested against Gram-positive strains.Taken together,the synergistic effect of RGO and CDs enhanced the pho-tocatalytic and antibacterial performance of synthesized nanocomposite material.

关键词： Nanocomposite Carbon dot Hydrothermal method Photocatalysis Antibacterial activity

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

Brazilin from Caesalpinia sappan heartwood and its pharmacological activities:A review

引用

Asian Pacific Journal of Tropical Medicine 2015年第6期8卷 421-430页

作者： Nilesh P Nirmal Mithun S Rajput Rangabhatla G.S.V.Prasad mehraj ahmad Center for Nutrition and Food Sciences Queensland Alliance for Agriculture and Food InnovationUniversity of QueenslandHealth and Food Sciences PrecinctBlock 1039 Kessels RoadCoopers PlainsAcheifield Brisbane QLD 4108Australia Department of Medical Biochemistry.MGM Medical College Biomedical and Pharmaceutical Technology Research Group Nano Research for Advanced Materials Institute of Nutrition.Mahidol University 999 Phutthamonthon 4 Rd.SalayaNakhon Pathom-73170Thailand

Caesalpinia sappan L.(CS) is a plant of Leguminosae family,commonly known as Brazil or Sappan wood.CS is distributed in Southeast Asia and its dried heartwood has been used as traditional ingredient of food or beverages and has a wide variety of medicinal properties.Higher extraction yield of CS wood was achieved with 95% ethanol for 2 h.Chemical constituent's investigation of sappan wood resulled in the isolation of various structural types of phenolic components including one xanihone,one coumarin,three chalcones,two flavones three homoisoflavonoids and brazilin.Brazilin[(6a S-cis)-7,11b-dihydrobcnz[b]indeno[1.2-d]pyran-3.6a.9.10(6H)- tetroll.a major and active compound found in CS heartwood.Most of the folkloric uses of brazilin were validated by the scientific studies such as antioxidant,antibacterial,anti-inflammatory,anti-photoaging.hypoglycemic,vasorelaxant,hepatoproteetive and anti-acne activity.CS heartwood extract is safe and did not produce any acute or subacute toxicity in both male and female rats.Brazilin is the safe natural compound having potential to develop as a medicinal compound with application in food,beverage,cosmetics and pharmaceutical industries to screen its clinical use in modern medicine.The information gained could provide the important and potential approach for pharmaceutical researcher to implicate the knowledge of brazilin in the formulation of new drug and to reveal therapeutic and gaps requiring future research opportunities.More studies are needed to evaluate the potential application of brazilin as preservative and coloring agent in food processing industries.

关键词： Brazilin Caesalpinia sappan Extraction Heartwood Pharamcological 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

Stability analysis of a fractional-order cancer model with chaotic dynamics

引用

International Journal of Biomathematics 2021年第6期14卷 239-261页

作者： Parvaiz ahmad Naik Jian Zu mehraj-ud-din Naikt School of Mathematics and Statistics Xi’an Jiaotong University Xi’anShaanxi 710049P.R.China Department of Chemical Engineering College of Engineering Jazan UniversityJazan 45142Saudi Arabia

In this paper,we develop a three-dimensional fractional-order cancer model.The proposed model involves the interaction among tumor cells,healthy tissue cells and activated effector cells.The detailed analysis of the equilibrium points is studied.Also,the existence and uniqueness of the solution are investigated.The fractional derivative is considered in the Caputo sense.Numerical simulations are performed to illustrate the effectiveness of the obtained theoretical results.The outcome of the study reveals that the order of the fractional derivative has a significant effect on the dynamic process.Further,the calculated Lyapunov exponents give the existence of chaotic behavior of the proposed model.Also,it is observed from the obtained results that decrease in fractional-order p increases the chaotic behavior of the model.

关键词： Cancer model Caputo fractional derivative chaos stability analysis.

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

Sequence Characterization of Coding Regions of the Myostatin Gene (GDF8) from Bakerwal Goats (Capra hircus) and Comparison with the Sheep (Ovis aries) Sequence

引用

Open Journal of Animal Sciences 2016年第3期6卷 157-162页

作者： Wani A. Ahad Sajad A. Beigh Mir mehraj Masroor Hussain Hina F. Bhat Riaz A. Shah ahmad S. Mudasir Division of Animal Biotechnology Faculty of Veterinary Sciences and Animal Husbandry Sher-e-Kashmir University of Agricultural Sciences & Technology of Kashmir Shuhama Alusteng India Faculty of Veterinary Sciences and Animal Husbandry Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu R S Pura India

The Bakerwal breed of goat in Kashmir valley is a good meat purpose breed of goat. That attains an appreciable body weight under a low input production system. As these goats are mainly reared by Gujjar and Bakarwal tribes of the J & K state, so they usually are fed with the weeds, herbs, shrubs and grasses of pastures that will otherwise go waste. These goats constitute the main livestock wealth. With the good productive and reproductive potential, it makes these animals an important animal protein source for developing countries like India. The myostatin gene (GDF8) is important in the physiology of stock animals because its product produces a direct effect on muscle development and consequently also on meat production. The myostatin sequence is known in several mammalian species and shows a high degree of amino acid sequence conservation, although several alterations in the intron and exon regions have been identified. The objective of our work is to characterize the myostatin coding regions using gene sequencing and polymerase chain reaction methods of Capra hircus (Bakerwal breed) and to compare them with the Ovis aries and other livestock species of animal, looking for variations in nucleotide and protein sequences. As mutations in the myostatin gene can inactivate its expression and result in a non-functional protein, which leads to increase in muscle growth in many species. In this way, we are able to identify 3 alterations on the presumed myostatin protein sequence as compared to non double-muscled ovine sequences.

关键词： Goat GDF8 Myostatin Bakerwal Intron Exon

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

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

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：