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Palladium and carbon synergistically catalyzed room-temperature hydrodeoxygenation(HDO) of vanillyl alcohol–A typical lignin model molecule

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Journal of Energy Chemistry 2017年第1期26卷 8-16页

作者： Qi Wang Neeraj Gupta Guodong Wen Sharifah Bee abd hamid Dang Sheng Su School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences Nanotechnology & Catalysis Research Centre (NANOCAT) University of Malaya IPS Building

Vanillyl alcohol, which is made up of an aromatic ring, an alcoholic hydroxyl group, a phenolic hydroxyl group and a methoxy group, was selected as the model molecule of lignin. Various carbon materials supported Pd catalysts were chosen to catalyze the HDO of vanillyl alcohol. The catalysts were characterized via TEM, TPD, XRD, XPS and CO-chemisorption. It was found that different carbon materials could obviously influence the particle sizes, dispersion and distribution of Pd or PdO particles. Palladium and carbon can synergistically catalyze the room-temperature HDO of vanillyl alcohol even at room temperature, and the carboxyl group was found to be the effective active acid site during the reaction. Possible reaction mechanism was also proposed. The existence of the effective active acid sites on the carbon supports could obviously lower the reaction temperature without decreasing the selectivity, as a result, making the production of renewable fuels by HDO much more economically feasible, which is of much importance. © 2016 Science Press

关键词： Bioconversion Carbon Catalysts Dispersions Molecules Palladium

TelG Mote: A Green Wireless Sensor Node Platform for Smart Home and Ambient Assisted Living

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Journal of Electronic Science and Technology 2016年第3期14卷 211-219页

作者： Mohd Rozaini Bin abd Rahim Rozeha A.Rashid Norsheila Fisal Zubair Khalid abdul Hadi Fikri abd hamid Universiti Teknologi Malaysia

The wireless sensor network （WSN） consists of sensor nodes that interact with each other to collectively monitor environmental or physical conditions at different locations for the intended users. One of its potential deployments is in the form of smart home and ambient assisted living （SHAAL）to measure patients or elderly physiological signals, control home appliances, and monitor home. This paper focuses on the development of a wireless sensor node platform for SHAAL application over WSN which complies with the IEEE 802.15.4 standard and operates in 2.4 GHz ISM （industrial, scientific, and medical） band. The initial stage of SHAAL application development is the design of the wireless sensor node named TelG mote. The main features of TelG mote contributing to the green communications include low power consumption, wearable, flexible, user-friendly, and small sizes. It is then embedded with a self-built operating system named WiseOS to support customized operation. The node can achieve a packet reception rate （PRR） above 80% for a distance of up to 8 m. The designed TelG mote is also comparable with the existing wireless sensor nodes available in the market.

关键词： Smart home and ambient assisted living wireless sensor network wireless sensor node.

Facile preparation of Nd2Zr2O7–ZrO2 nanocomposites as an effective photocatalyst via a new route

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Journal of Energy Chemistry 2017年第2期26卷 315-323页

作者： Sahar Zinatloo-Ajabshir Zahra Zinatloo-Ajabshir Masoud Salavati-Niasari Samira Bagheri Sharifah Bee abd hamid Institute of Nano Science and Nano Technology University of KashanKashanP.O.Box.87317-51167I.R.Iran School of Pharmacy Mazandaran University of Medical SciencesSariP.O.Box.486717–887I.R.Iran Nanotechnology&Catalysis Research Centre(NANOCAT) IPS BuildingUniversity of Malaya50603 Kuala LumpurMalaysia

NdZrO–ZrOnanocomposites were prepared via a facile process with propylene glycol as novel connecting agent and benzene tricarboxylic acid as a new complexing agent. The as-obtained NdZrO–ZrOnanocomposites were characterized by transmission electron microscopy（TEM）, UV–vis diffuse reflectance spectroscopy, energy dispersive X-ray microanalysis（EDX）, Fourier transform infrared（FT-IR）spectroscopy, field emission scanning electron microscopy（FESEM）, and X-ray diffraction（XRD）. According to the morphological studies of the as-synthesized nanocomposites, it was found that the shape and particle size of NdZrO–ZrOnanocomposites depended on the space-filling template type, dosage of space-filling template and tricarboxylic acid as complexing agent. NdZrO–ZrOnanocomposites with different shapes and grain sizes have been synthesized. The photocatalytic behavior of as-produced NdZrO–ZrOnanocomposites was also investigated through photodegradation of methylene blue dye and 2-naphthol as water pollutants.

关键词： Photocatalyst Nanomaterials Photodegradation Nanocomposites Electron microscopy

N-Methylimidazolium perchlorate as a new ionic liquid for the synthesis of bis(pyrazol-5-ol)s under solvent-free conditions

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Chinese Chemical Letters 2016年第1期27卷 104-108页

作者： Nader Ghaffari Khaligh Sharifah Bee abd hamid Salam J.J.Titinchi Nanotechnology & Catalysis Research Centre NANOCAT University Malaya Department of Chemistry University of the Western Cape

N-Methylimidazolium perchlorate（[MIm]ClO_4） was synthesized and some of its physico-chemical properties, such as density, surface tension were investigated. A thermo gravimetric analysis（TGA） and solvent performance were also studied. The results show that this ionic liquid is an excellent catalyst for the synthesis of 4,4＇-（arylmethylene）bis（1H-pyrazol-5-ol） derivatives under solvent-free *** method has the advantages of high yield, clean transformation, simple operation and short reaction time. The ionic liquid can be recycled without significant loss of activity.

关键词： Ionic liquid N-Methylimidazolium perchlorate Bis(pyrazol-5-ol)s Recycle

Electrochemical Generation of Cubic Shaped Nano Zn_2SnO_4 Photocatalysts

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Nano-Micro Letters 2013年第2期5卷 101-110页

作者： Chandrappa K.Govindappa Venkatesha T.Venkatarangaiah Sharifah B.abd hamid Nanotechnology & Catalysis (NANOCAT) research centre IPS Building University of Malaya Department of Chemistry Jnana Sahyadri Kuvempu University

In this contribution, an efficient and simple two-step hybrid electrochemical-thermal route was developed for the synthesis of cubic shaped Zn_2SnO_4 (ZTO) nanoparticles using aqueous sodium bicarbonate(NaHCO_3) and sodium stannate(Na_2SnO_3) electrolyte. The sacrificial Zn was used as anode and cathode in an undivided cell under galvanostatic mode at room temperature. The bath concentration and current density were respectively varied from 30 to 120 mmol and 0.05 to 1.5 A/dm^2. The electrochemically generated precursor was calcined for an hour at different range of temperature from 60 to 600. The crystallite sizes in the range of 24-53 nm were calculated based on Debye-Scherrer equation. Scanning electron microscope and transmission electron microscopy results reveal that all the particles have cubic morphology with diameter of40-50 nm. The as-prepared ZTO samples showed higher catalytic activity towards the degradation of methylene blue(MB) dye, and 90% degradation was found for the sample calcined at 600, which is greater than that of commercial TiO_2-P25 photocatalysts. The photodegradation efficiency of ZTO samples was found to be a function of exposure time and the dye solution p H value. These results indicate that the ZTO nanoparticles may be employed to remove dyes from wastewater.

关键词： Electrochemistry Zn2SnO4 Photocatalyst Cubic Nanoparticle

Differential control of growth,apoptotic activity and gene expression in human colon cancer cells by extracts derived from medicinal herbs,Rhazya stricta and Zingiber officinale and their combination

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World Journal of Gastroenterology 2014年第41期20卷 15275-15288页

作者： Ayman I Elkady Rania abd El hamid Hussein Osama A Abu-Zinadah Department of Biological Sciences Faculty of SciencesKing Abdulaziz University Zoology Department Faculty of ScienceAlexandria University Department of Clinical Nutrition Faculty of Applied Medical SciencesKing Abdulaziz University Gamal abd El Nasser Hospital

AIM: To investigate the effects of extracts from Rhazya stricta (R. stricta) and Zingiber officinale (Z. officinale) on human colorectal cancer cells.

关键词： Apoptosis Colorectal cancer Oncogenes Phytochemicals Tumor suppressor proteins

The Current Status of Riparian Vegetation along Bank of Kelantan River after the Worst Flood for Decades

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湿地科学 2017年第1期15卷 60-65页

作者： Onrizal Siti Norasikin Ismail Muzzalifah abd hamid Mashhor Mansor Faculty of Forestry University of Sumatera Utara Medan 2011 Indonesia School of Biological Sciences Universiti Sains Malaysia 11800 Pulau Pinang Malaysia

Undeniably Kelantan is one of the east coast states of Malaysia,which has faced yearly flooding catastrophe especially during north-east-monsoon *** aims of this study are to record the land uses from upstream to downstream of Kelantan River basin,and to record the riparian vegetation that are resistance and susceptible to flood situations in affected areas along the bank of Kelantan River after December 2014 when the worst flood was recorded for decades.A serial of surveys were conducted at 9 sampling sites(S1 to S9)from the upstream to the downstream in the *** massive clearing in the forest in the basin particularly in the upper streams was a serious *** loads of sedimentations greatly affected the hydrological system of Kelantan *** were 64 plant species were recorded in this *** sampling sites were submerged and most of the riparian plants survived although the flood levels reached 10 *** the other hand,some commercial tree species such as Elaeis guenensis,Lansium parasiticum and Nephelium lappaceum could not thrive in flooding *** should be noted that the populations of noxious,such as Mimosa pigra and Piper aduncum had colonized most parts of riparian *** due to the disturbances of catchment and riparian vegetations,the river water regimes have been ***,the ecological assessments and socio-economic approaches were recommended in order to mitigate the flood situation.

关键词：种子萌发盐分胁迫氮磷比碱蓬潮滩

加热与超声辐照条件下4-(丁二酰亚胺基)-1-丁烷磺酸Brnsted酸催化剂催化吡喃并[4,3-b]吡喃衍生物合成(英文)

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催化学报 2015年第5期36卷 728-733页

作者： Nader Ghaffari Khaligh Sharifah Bee abd hamid Nanotechnology & Catalysis Research Centre NANOCAT University Malaya

4-(Succinimido)-1-butane sulfonic acid was shown to be an efficient and reusable Brnsted acid catalyst for the synthesis of pyrano[4,3-b]pyran derivatives using thermal and ultrasonic conditions. The catalyst was prepared by mixing succinimide and 1,4-butanesultone, which is simpler and safer than the preparation of succinimide sulfonic acid. This method has the advantages of high yield, clean reaction, simple methodology, and short reaction time. The catalyst can be recycled without loss of activity.

关键词：吡喃衍生物琥珀酰亚胺超声波照射酸催化剂亚胺基磺酸布朗丁烷

Effects of Nephrolithiasis on Serum DNase(Deoxyribonuclease Ⅰ and Ⅱ) Activity and E3 SUMO-Protein Ligase NSE2(NSMCE2) in Malaysian Individuals

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Biomedical and Environmental Sciences 2015年第9期28卷 660-665页

作者： Faridah Yusof Atheer Awad Mehde Wesen Adel Mehdi Raha Ahmed Raus hamid Ghazali Azlina abd Rahman Department of Biotechnology Engineering College of EngineeringInternational Islamic University Malaysia Department of Medical Analysis Health and Medical Technical College Department of Chemistry College of Sciences for WomenUniversity of Baghdad Department of Urology Hospital Tengku Ampuan Afzan Department of Pathology Hospital Tengku Ampuan Afzan

Objective Nephrolithiasis is one of the most common disorders of the urinary tract. The aim of this study was to examine a possible relationship between DNase Ⅰ/Ⅱ activity and E3 SUMO-protein ligase NSE2 in the sera of nephrolithiasis patients to evaluate the possibility of a new biomarker for evaluating kidney damage. Methods Sixty nephrolithiasis patients and 50 control patients were enrolled in a case-control study. Their blood urea, creatinine, protein levels and DNase Ⅰ/Ⅱ activity levels were measured by spectrometry. Serum NSMCE2 levels were measured by ELISA. Blood was collected from patients of the government health clinics in Kuantan-Pahang and fulfilled the inclusion criteria. Results The result indicated that mean levels of sera NSMCE2 have a significantly increase（P〈0.01） in patients compared to control group. Compared with control subjects, activities and specific activities of serum DNase Ⅰ and Ⅱ were significantly elevated in nephrolithiasis patients（P〈0.01）. Conclusion This study suggests that an increase in serum concentrations of DNase Ⅰ/Ⅱ and E3 SUMO-protein ligase NSE2 level can be used as indicators for the diagnosis of kidney injury in patients with nephrolithiasis.

关键词： Nephrolithiasis DNase Ⅰ DNase Ⅱ E3 SUMO-protein ligase NSE2 NSMCE2