检索结果-南通市图书馆

The Inhibition Effects of Alkoxyl Thiourea Derivatives toward the Growth of Isolated Oscillatoria sp. from Kenyir Lake, Terengganu

引用

Journal of Environmental Science and Engineering(A) 2015年第8期4卷 389-394页

作者： Nor Azman Kasan siti zafirah mohamad yusof Naqiyyu Bazz Ramli Wan M. Khairul Hazlina Ahamad Zakeri Institute of Tropical Aquaculture (AKUATROP) University Malaysia Terengganu Kuala Terengganu 21030 Malaysia School of Fisheries and Aquaculture Science Universiti Malaysia Terengganu Kuala Terengganu 21030 Malaysia School of Fundamental Science Universiti Malaysia Terengganu Kuala Terengganu 21030 Malaysia

In controlling eutrophication phenomenon, there were conventional methods which lead to negative effects to aquatic environment. This study was aimed to investigate the usage of synthesized thiourea compounds to inhibit the growth of Oscillatoria sp. in Kenyir lake, Terengganu, Malaysia. The inhibition effects of four eco-friendly alkoxyl thiourea derivatives compounds named as N-（（4-（decyloxy）phenyl）carbamothioyl）-4-methyl benzamide, N-（（4-（decyloxy）phenyl）carbamothioyl）-4-nitro benzamide, 4-chloro-N-（（4-（decyloxy）phenyl）carbamothioyl） benzamide and N-（（4-（decyloxy）phenyl）carbamothioyl） benzamide were examined onto the growth culture of Oscillatoria sp. These compounds were tested in 30 mL of Oscillatoria sp. cultures with different concentration of 16 μg·mL-1, 18 μg·mL-1, 20 μg·mL-1, 24 μg·mL-1 and 28 μg·mL-1respectively. The treatment flasks were supplied with an aerator for 24 hours under continuous illumination at 25 ℃. Chlorophyll-a concentration were extracted to calculate the inhibition percentage of each treatment. Overall, all these compounds showed inhibition effects towards the growth of Oscillatoria sp., with the highest inhibition of 37% by N-（（4-（decyloxy）phenyl）carbamothioyl）-4-methyl benzamide at the concentration of 18μg·mL-1. The methyl group that attach to the synthesized compound may contribute to the effectiveness of the compound which act as an algae inhibitor. However, extensive studies still need to be conducted in order to investigate the mechanism on how this compound reacts with Oscillatoria sp..

关键词： Eutrophication alkoxyl thiourea Oscillatoria sp. chlorophyll-a inhibition effect.

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

Fabrication of titanium-based alloys with bioactive surface oxide layer as biomedical implants:Opportunity and challenges

引用

Transactions of Nonferrous Metals Society of China 2022年第1期32卷 1-44页

作者： mohamad Rodzi siti NUR HAZWANI Ling Xin LIM Zainovia LOCKMAN Hussain ZUHAILAWATI Biomaterials Niche Area Group School of Materials and Mineral Resources EngineeringUniversiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia

Titanium and its alloys have long been used as implant materials due to their outstanding mechanical properties and apparent *** this,the search for better alloys has continued to be active by researchers and industries alike,as there are still pressing issues that require *** include(1)a large mismatch in the elastic modulus of the implant material,which causes a stress shielding problem;(2)the release of harmful ions from Ti alloys after long-term use;(3)a low bioactivity of the Ti alloy surface,which prolongs the healing *** research has been directed toward finding new generation Ti alloys composed of more biocompatible phases and modifying the surface of Ti alloys from naturally bio-inert to bioactive in order to circumvent the *** review examines recent work reported on the fabrication of Ti alloys,and based on the survey,major characteristics highlighted the importance of elastic modulus and the use of non-toxic metal elements to improve *** terms of surface modification of Ti alloys,numerous studies have found that a nano-scaled surface oxide layer grown on the surface is always beneficial to improving the bioactivity of Ti alloys for rapid recovery after *** comprehensive review focuses on the appropriate phase and composition for new Ti alloys intended for use as biomedical implants,emphasizing both fabrication and surface modification methods.

关键词： titanium alloy orthopedic application surface modification TiO_(2)nanotubes

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

Mechanical and degradation behaviour of biodegradable magnesium-zinc/hydroxyapatite composite with different powder mixing

引用

Journal of Magnesium and Alloys 2019年第4期7卷 566-576页

作者： siti Nur Hazwani mohamad Rodzi Hussain Zuhailawati B.K.Dhindaw Biomaterials Niche Area Group School of Materials and Mineral Resources EngineeringUniversiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia School of Minerals Metallurgical and Materials EngineeringIndian Institute of Technology BhubaneswarBhubaneswar 751007India

Magnesium-based biomaterials have recently gained great attention as promising candidates for the new generation of biodegradable *** study investigated the mechanical performance and biodegradation behaviour of magnesium-zinc/hydroxyapatite(Mg-Zn/HA)composites fabricated by different powder mixing techniques.A single step mixing process involved mechanical alloying or mechanical milling techniques,while double step processing involved a combination of both mechanical alloying and mechanical *** mechanical properties of the composite were observed when the powders were prepared using single step processing via mechanical alloying ***,Mg-Zn/HA composite fabricated through single step processing via mechanical milling technique was found to have the most desirable low degradation rate coupled with highest *** composite achieved the lowest degradation rate of 0.039×10^−3 mm/year as measured by immersion test and 0.0230 mm/year as measured by electrochemical ***:P ratio of the composite also slightly more than enough to aid the initial bone mineralization,that is 1:1.76,as the required Ca:P ratio for initial bone mineralization is between 1:1 and 1:1.67.

关键词： Magnesium-based composite Biodegradable implant Powder metallurgy Mechanical alloying Mechanical milling

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

Numerical Simulations of One-Directional Fractional Pharmacokinetics Model

引用

Computers, Materials & Continua 2022年第12期73卷 4923-4934页

作者： Nursyazwani mohamad Noor siti Ainor Mohd Yatim Nur Intan Raihana Ruhaiyem School of Distance Education Universiti Sains MalaysiaUSM PenangPenang11800Malaysia School of Computer Science Universiti Sains MalaysiaUSM PenangPenang11800Malaysia

In this paper,we present a three-compartment of pharmacokinetics model with irreversible rate *** compartment consists of arterial blood,tissues and venous ***’s principle and the law of mass action were used to develop the model based on the diffusion *** model is modified into a fractional pharmacokinetics model with the sense of Caputo *** existence and uniqueness of the model are investigated and the positivity of the model is *** behaviour of the model is investigated by implementing numerical algorithms for the numerical solution of the system of fractional differential *** software is used to plot the graphs for illustrating the variation of drug concentration concerning ***,the numerical simulations of the model are presented for different values ofαwhich verified the theoretical ***,we also observed the pattern of the simulations at the three-compartment of the model by using different values of initial conditions.

关键词： Pharmacokinetics model Irreversible rate Fractional order Numerical simulations

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

Detection of human papillomavirus in oropharyngeal squamous cell carcinoma

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第12期21卷 961-976页

作者： Fatin Hazwani FAUZI Nurul Izzati HAMZAN Nurhayu Ab RAHMAN siti SURAIYA Suharni mohamad School of Dental Sciences Universiti Sains Malaysia16150 Kubang KerianKelantanMalaysia Department of Medical Microbiology and Parasitology School of Medical SciencesUniversiti Sains Malaysia16150 Kubang KerianKelantanMalaysia

Worldwide there has been a significant increase in the incidence of oropharyngeal squamous cell carcinoma(OPSCC)etiologically attributed to oncogenic human papillomavirus(HPV).Reliable and accurate identification and detection tools are important as the incidence of HPV-related cancer is on the *** HPV detection methods for OPSCC have been developed and each has its own advantages and disadvantages in regard to sensitivity,specificity,and technical *** review summarizes our current knowledge of molecular methods for detecting HPV in OPSCC,including HPV DNA/RNA polymerase chain reaction(PCR),loop-mediated isothermal amplification(LAMP),p16 immunohistochemistry(IHC),and DNA/RNA in situ hybridization(ISH)*** summary may facilitate the selection of a suitable method for detecting HPV infection,and therefore may help in the early diagnosis of HPV-related carcinoma to reduce its mortality,incidence,and morbidity.

关键词： Human papillomavirus(HPV) Molecular detection Oropharyngeal squamous cell carcinoma(OPSCC)

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

Review on Zinc Oxide Nanoparticles: Antibacterial Activity and Toxicity Mechanism

引用

Nano-Micro Letters 2015年第3期7卷 219-242页

作者： Amna Sirelkhatim Shahrom Mahmud Azman Seeni Noor Haida mohamad Kaus Ling Chuo Ann siti Khadijah Mohd Bakhori Habsah Hasan Dasmawati mohamad Nano-Optoelectronics Research and Technology Laboratory (N.O.R.Lab) School of Physics Universiti Sains Malaysia Advanced Medical and Dental Institute Cluster of Integrative Medicine Universiti Sains Malaysia School of Chemical Sciences Universiti Sains Malaysia Nano-Optoelectronics Research and Technology Laboratory(N.O.R.Lab) School of Physics Universiti Sains Malaysia Department of Medical Microbiology Parasitology and Immunology School of Medical Sciences Universiti Sains Malaysia School of Dental Sciences Universiti Sains Malaysia

Antibacterial activity of zinc oxide nanoparticles(Zn O-NPs) has received significant interest worldwide particularly by the implementation of nanotechnology to synthesize particles in the nanometer region. Many microorganisms exist in the range from hundreds of nanometers to tens of micrometers. Zn O-NPs exhibit attractive antibacterial properties due to increased specific surface area as the reduced particle size leading to enhanced particle surface reactivity. Zn O is a bio-safe material that possesses photo-oxidizing and photocatalysis impacts on chemical and biological species. This review covered Zn O-NPs antibacterial activity including testing methods, impact of UV illumination, Zn O particle properties(size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration. Particular emphasize was given to bactericidal and bacteriostatic mechanisms with focus on generation of reactive oxygen species(ROS) including hydrogen peroxide(H2O2), OH-(hydroxyl radicals), and O2-2(peroxide). ROS has been a major factor for several mechanisms including cell wall damage due to Zn O-localized interaction, enhanced membrane permeability, internalization of NPs due to loss of proton motive force and uptake of toxic dissolved zinc *** have led to mitochondria weakness, intracellular outflow, and release in gene expression of oxidative stress which caused eventual cell growth inhibition and cell death. In some cases, enhanced antibacterial activity can be attributed to surface defects on Zn O abrasive surface texture. One functional application of the Zn O antibacterial bioactivity was discussed in food packaging industry where Zn O-NPs are used as an antibacterial agent toward foodborne diseases. Proper incorporation of Zn O-NPs into packaging materials can cause interaction with foodborne pathogens, thereby releasing NPs onto food surface where they come in contact with bad bacteria and cause the bacterial death and/or in

关键词： Antibacterial activity Zn O-NPs Toxicity mechanism Reactive oxygen species Zinc ions release Food antimicrobial

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

Influence of urban air pollution on the population in the Klang Valley,Malaysia:a spatial approach

引用

Ecological Processes 2022年第1期11卷 126-141页

作者： siti Haslina Mohd Shafie Mastura Mahmud Suzani mohamad Nor Lita Fadilah Rameli Ramdzani Abdullah Ahmad Fariz Mohamed Centre for Research in Development Social and Environment(SEEDS)Faculty of Social Sciences and HumanitiesUniversiti Kebangsaan MalaysiaBangiSelangorMalaysia Department of Environment Faculty of Forestry and Envi-ronmentUniversiti Putra MalaysiaSerdangSelangorMalaysia Institute for Environment and Development(LESTARI) Universiti Kebangsaan MalaysiaBangiSelangorMalaysia.

Background:Urban air pollution resulting from economic growth as well as urbanization impacts the health of *** study aims to examine the spatial distribution of particulate matter(PM_(10))and the risk of exposure for the population in the Klang Valley,an urban conglomeration centred in Kuala Lumpur,***:The inverse distance weighted(IDW)interpolation technique in the ArcGIS platform was used to map the air quality from five air monitoring *** statistics of the Global Moran’s I Spatial Autocorrelation and Optimized Hot Spot Analysis were used to estimate the spatial clustering of PM_(10).The population-weighted exposure level(PWEL)technique was used to calculate the population density susceptible to PM_(10)and the AirQ+model was applied to estimate the proportion of the adult population at risk of chronic bronchitis due to long-term exposure to PM_(10)concentrations in the Klang ***:The highest annual mean PM_(10)concentrations at the Klang station ranged between 80 and 100μg/m^(3)from 2000 to 2009 and exceeded the New Malaysia Ambient Air Quality Standard(NMAAQS)and the World Health Organi-zation Air Quality Guidelines(WHOAQG)levels of 40 and 20μg/m^(3),*** Moran’s I results indicated that the statistically significant clusters of high PM_(10)in Klang present a health risk to the local *** PWEL results showed that levels of PM_(10)in Petaling Jaya exceeded the WHOAQG limits,potentially posing a health risk to the high-density *** AirQ+model found Klang to be a significantly high-risk area for chronic bronchitis among the adult population with 804,240 people(with a relative risk of 1.85)in ***:These high-risk values are due to rapid urbanization and high motor vehicle usage in the Klang Valley and therefore the impact of PM_(10)on the population needs to be *** situation should be taken seriously by the Department of Environment and Kuala Lumpur City Hall in addre

关键词： Population Urban air pollution Spatial distribution PM_(10) Adult chronic bronchitis risk

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

In-vitro antimicrobial effectiveness of herbal-based mouthrinses against oral microorganisms

引用

Asian Pacific Journal of Tropical Biomedicine 2015年第5期5卷 370-374页

作者： Ju Ying Teh Rabiah Rawi siti Suraiya Md Noor Haslina Taib Suharni mohamad School of Dental Sciences Universiti Sains Malaysia Department of Medical Microbiology & Parasitology School of Medical Sciences Universiti Sains Malaysia

Objective: To evaluate the in vitro antimicrobial effectiveness of commercial herbal-based mouthrinses against oral microorganisms. Methods: A total of three mouthrinses(OX, Pesona and Watsons) were tested for their antimicrobial activity against six oral organisms, Streptococcus mutans(S. mutans), Streptococcus sobrinus(S. sobrinus), Lactobacillus salivarius(L. salivarius), Staphylococcus aureus(S. aureus), Pseudomonas aeruginosa(P. aeruginosa) and Candida albicans(C. albicans) by standard agar-disk diffusion assay. Oradex mouthrinse containing 0.12% chlorhexidine gluconate and sterile distilled water was served as positive and negative controls, respectively. Results: All mouthrinse formulations were effective in inhibiting the growth of S. mutans, S. sobrinus, L. salivarius and C. albicans. Among the tested mouthrinses, Pesona was the only effective mouthrinse against S. aureus and P. aeruginosa, similar to Oradex mouthrinse. Pesona mouthrinse formulation appears to be as effective as Oradex mouthrinse formulation to kill S. aureus and P. aeruginosa. Statistical analysis showed no significant difference among the tested formulations regarding their antimicrobial activities(P > 0.05).Conclusions: Pesona was not the only herbal mouthrinse effective in inhibiting the growth of S. mutans, S. sobrinus, L. salivarius and C. albicans in vitro. All tested formulations were effective against those strains. Our findings may serve as a guide for selecting a kind of herbal mouthrinses as well as providing information to the dental professionals about the efficacy of these products.

关键词： Mouthrinses Chlorhexidine gluconate Antimicrobial properties Zones of inhibitions

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

教师专业发展周期（TPDC）对文莱达鲁萨兰国小学教师对话式教学的影响

教师专业发展周期（TPDC）对文莱达鲁萨兰国小学教师对话式教学的...

引用

作者： siti Norazimah Binti mohamad 华东师范大学

学位级别：硕士

文莱达鲁萨兰国教育部制定了文莱教师标准(Brunei Teacher Standards,BTS),以支持文莱2035年教育战略愿景(BTS-TPA,2021年1月发布)中的政策指令。该教师标准旨在详细阐述教师专业发展中值得关注和改进之处。本研究旨在调查教师专业发展... 详细信息

文莱达鲁萨兰国教育部制定了文莱教师标准(Brunei Teacher Standards,BTS),以支持文莱2035年教育战略愿景(BTS-TPA,2021年1月发布)中的政策指令。该教师标准旨在详细阐述教师专业发展中值得关注和改进之处。本研究旨在调查教师专业发展周期(Teacher Professional Development Cycle,TPDC)模型对改进教师对话式教学实践的影响。本研究涉及3个研究问题,即1)对话式教学的教师专业发展周期各阶段的特点是什么?2)关于对话式教学的教师专业发展周期,教师有何看法?3)教师的对话教学能力能否通过教师专业发展周期得到改善?这是一项准实验性小型行为研究,采用混合数据收集方法。研究使用了几个数据源1)对话教学的同行观察评估清单;2)现场笔记;3)教师专业发展周期的教师问卷;4)半结构化访谈的视频和音频记录;5)教师绩效考核的前期和后期数据。共计40名小学教师参与研究,其中男教师9人,女教师31人。教师专业发展周期对提高教师绩效(特别是对话式教学)贡献最大的阶段是探索和实施阶段。在这些阶段,教师学习、寻找对话教学资源并分享给其他教师。他们对所学知识进行实践,还可以观察其他同行的对话式教学方法。由此,他们意识到不同类型的提问方式可以满足不同学生的学习能力,使得4年级学生的课程参与度达到了41%。

关键词：教师专业发展有效的专业发展合作对话式教学教师提问

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Antimicrobial effect of Malaysian vegetables against enteric bacteria

引用

Asian Pacific Journal of Tropical Biomedicine 2016年第3期6卷 211-215页

作者： Hassanain Al-Talib Norliana Dalila mohamad Ali Mohamed Harreez Suhaimi siti Shafika Nabila Rosli Nurul Huda Othman Nur Ain Sakinah Mansor Amira Kartini Sulaiman Shah Nurul Syuhada Ariffin Alyaa Al-Khateeb Laboratory Medical Science Cluster Faculty of Medicine Universiti Teknologi MARA (UiTM) Faculty of Medicine Universiti Teknologi MARA (UiTM)

Objective: To investigate the antibacterial activities of green vegetables(pennywort,mint, garlic, parsley and celery) against four common enteric bacteria [Salmonella enterica(ATCC 25957)(S. enterica), Shigella flexneri(ATCC 12022)(S. flexneri),Escherichia coli(ATCC 43889)(E. coli) and Enterobacter cloacae(ATCC 13047)(E. cloacae)] as an alternative medicine for controlling food borne diarrhea disease and the synergistic effect of green vegetables against those ***: Five common vegetables(pennywort, mint, garlic, parsley and celery) were purchased and extracted. The antimicrobial activities of these extracts were tested against four common enteric bacteria(S. enterica, S. flexneri, E. coli and E. cloacae). Ten different concentrations of the extracts(from 640 to 1.25 mg/m L) were prepared and used for the study. The minimal inhibitory concentration(MIC) was determined by the broth dilution method. The antimicrobial activities were assessed by using both well diffusion and disc diffusion ***: Garlic extract showed excellent inhibitory effects on all enteric bacteria. Other plants(parsley, celery, mint and pennywort) were not effective against enteric *** MIC of garlic against S. flexneri and E. cloacae was 40 mg/m L. The MIC of S. enterica and E. coli were 20 and 10 mg/m L, respectively. The performance of the well diffusion method was better than that of the disc diffusion method with clear and sharp inhibition zones of tested bacteria against plant ***: Garlic had excellent antimicrobial effects against enteric bacteria and was recommended to be given to patients with gastroenteritis. The other vegetables(pennywort, mint, parsley and celery) showed no inhibitory effects on enteric bacteria but still can be used for its richness in vitamins and fibers. The performance of the well diffusion method was better than that of the disc diffusion method in detecting the antibacterial effects of green vegetables.

关键词： Antibacterial activities Green vegetables Enteric bacteria Inhibitory effects

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

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

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：