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Parametric study and effect of calcination and carbonation conditions on the CO_2 capture performance of lithium orthosilicate sorbent

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Chinese Journal of Chemical Engineering 2018年第3期26卷 631-641页

作者： nurul Azrin Zubbri Abdul Rahman mohamed Maedeh Mohammadi Low Carbon Economy (LCE) Research Group School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Faculty of Chemical Engineering Babol Noushirvani University of Technology

The world is currently facing the challenges of global warming and climate change. Numerous efforts have been taken to mitigate CO2 emission, among which is the use of solid sorbents for CO2 capture. In this work, Li4SiO4 was synthesised via a sol-gel method using lithium nitrate （LiNO3） and tetraethylorthosilicate （SiC8H20O4） as precursors. A parametric study of Li：Si molar ratio （1-5）, calcination temperature （600-800℃） and calcination time （1-8 h） were conducted during sorbent synthesis. Calcination temperature （700-800℃） and carbonation temperature （500-700℃） during CO2 sorption activity were also varied to confirm the optimum operating temperature. Sorbent with the highest CO2 sorption capacity was finally introduced to several cyclic tests to study the durability of the sorbent through 10 cycles of CO2 sorption-desorption test. The results showed that the calcination temperature of 800℃ and carbonation temperature of 700℃ were the best operating temperatures, with CO2 sorption capacity of 7.95 mmol CO2·（g sorbent）^-1 （93% of the theoretical yield）. Throughout the ten cyclic processes, CO2 sorption capacity of the sorbent had dropped approximately 16.2% from the first to the tenth cycle, which was a reasonable decline. Thus, it was concluded that Li4SiO4 is a potential CO2 solid sorbent for high temperature CO2 capture activity.

关键词： CO2 capture Adsorption Carbon dioxide Lithium orthosilicate Sol-gel Sorption-desorption

Effects of plant growth regulators, carbon sources and pH values on callus induction in Aquilaria malaccensis leaf explants and characteristics of the resultant calli

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Journal of Forestry Research 2014年第3期25卷 535-540页

作者： Shashita JAYARAMAN nurul Hazwani DAUD Rasmina HALIS Rozi mohamed Forest Biotech Laboratory Department of Forest Management Faculty of Forestry Universiti Putra Malaysia Department of Forest Production Faculty of Forestry Universiti Putra Malaysia

The endangered tropical tree, Aquilaria malaccensis, produces agarwood for use in fragrance and medicines. Efforts are currently un-derway to produce valuable agarwood compoundsn tissue culture. The purpose of this study was to develop an optimal growth medium, specif-ically, the best hormone combination for callus suspension culture. Using nursery-grown A. malaccensis, sterilized leaf explants were first incu-bated on basic Murashige and Skoog （MS） gel medium containing 15g/L sucrose and at pH 5.7. Different auxin types including 1-naphthaleneacetic acid （NAA）, 2,4-dichlorophenoxyacetic acid （2,4-D）, and indole-3-butyric acid （IBA）, were tested at various concentrations （0.55, 1.1 and 1.65 μM） using the basic medium. Leaf explants were incubated for 30 days in the dark. Callus induced by 1.1 μM NAA had the highest biomass dry weight （DW） of 17.3 mg;however the callus was of a compact type. This auxin concentration was then combined with either 6-benzylaminopurine （BAP） or kinetin at 0.55, 1.1, 2.2 or 3.3 μM to induce growth of friable callus. The 1.1μM NAA＋2.2μM BAP com-bination produced friable callus with the highest biomass （93.3mg DW）. When testing the different carbon sources and pHs, sucrose at 15g/L and pH at 5.7 yielded highest biomasses at 87.7mg and 83mg DW, respec-tively. Microscopic observations revealed the arrangement of the friable cells as loosely packed with relatively large cells, while for the compact callus, the cells were small and densely packed. We concluded that MS medium containing 15 g/L sucrose, 1.1 μM NAA ＋ 2.2 μM BAP hor-mone combination, and a pH of 5.7 was highly effective for inducing friable callus from leaf explants of A. malaccensis for the purpose of establishing cell suspension culture.

关键词： Agarwood endangered tree in vitro plant growth regulators,Thymelaeaceae

Mechanisms underlying the vascular relaxation activities of Zingiber officinale var. rubrum in thoracic aorta of spontaneously hypertensive rats

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Journal of Integrative Medicine 2020年第1期18卷 46-58页

作者： Nadiah Razali Aidiahmad Dewa Mohd Zaini Asmawi Nornisah mohamed nurul Maizan Manshor Department of Physiology School of Pharmaceutical SciencesUniversiti Sains Malaysia11800 MindenPenangMalaysia Department of Pharmacology School of Pharmaceutical SciencesUniversiti Sains Malaysia11800 MindenPenangMalaysia Department of Chemistry School of Pharmaceutical SciencesUniversiti Sains Malaysia11800 MindenPenangMalaysia

Objective: To evaluate vasorelaxant and vasoconstriction effects of Zingiber officinale var. rubrum(ZOVR)on live rats and isolated aortic rings of spontaneously hypertensive rats(SHRs).Methods: Extracts of ZOVR were subjected to in-vivo antihypertensive screening using noninvasive blood pressures in SHRs. The most potent extract, ZOVR petroleum ether extract(ZOP) was then fractionated using n-hexane, chloroform and water. Isolated thoracic aortic rings were harvested and subjected to vascular relaxation studies of n-hexane fraction of ZOP(HFZOP) with incubation of different antagonists such as Nω-nitro-L-arginine methyl ester(L-NAME, 10 μmol/L), indomethacin(10 μmol/L), methylene blue(10 μmol/L), atropine(1 μmol/L), glibenclamide(10 μmol/L), prazosin(0.01 μmol/L), and propranolol(1 μmol/L).Results: During the screening of various ZOVR extracts, ZOP produced the most reduction in blood pressures of SHRs and so did HFZOP. HFZOP significantly decreased phenylephrine-induced contraction and enhanced acetylcholine-induced relaxation. L-NAME, indomethacin, methylene blue, atropine, and glibenclamide significantly potentiated the vasorelaxant effects of HFZOP. Propranolol and prazosin did not alter the vasorelaxant effects of HFZOP. HFZOP significantly suppressed the Ca2+-dependent contraction and influenced the ratio of the responses to phenylephrine in Ca2+-free ***: This study demonstrates that ZOP may exert an antihypertensive effect in the SHR model. Its possible vascular relaxation mechanisms involve nitric oxide and prostacyclin release, activation of cGMP-KATP channels, stimulation of muscarinic receptors, and transmembrane calcium channel or Ca2+release from intracellular stores. Possible active compounds that contribute to the vasorelaxant effects are 6-gingerol, 8-gingerol and 6-shogaol.

关键词： Zingiber officinale var.rubrum Vasorelaxation Vasoconstriction Aortic rings Herbal medicine

Antimicrobial effect of Malaysian vegetables against enteric bacteria

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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

铋和镍对钒磷氧化物催化剂性能的影响(英文)

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催化学报 2014年第2期35卷 270-276页

作者： Yun Hin Taufiq-Yap Choon Seon Yuen Nawi mohamed nurul Suziana Ramli Irmawati Catalysis Science and Technology Research Centre Faculty of ScienceUniversity Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia

Vanadium phosphorus oxide (VPO) catalysts were synthesized by the dihydrate method which involved the two steps for the preparation of the dihydrate (VOPO4 2H2 O) and the precursor hemi-hydrate (VOHPO4 0.5H2 O). Bi and Ni salt were added into the mixture of VOPO4 2H2 O and isobu-tanol, and the obtained precursors were calcined in a flow of a n-butane/air mixture to produce the promoted VPO catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorp-tion- desorption, inductively coupled plasma-atomic emission spectroscopy, scanning electron mi-croscopy (SEM), and H2 temperature-programmed reduction (H2 -TPR). Their catalytic properties were tested using a fixed-bed microreactor. All the catalysts gave main XRD peaks at 2θ = 22.9°, 28.5°, and 30.0°, attributing to the (020), (204), and (221) planes of the pyrophosphate phase (VO)2 P2 O7, respectively. The promoted catalysts have smaller crystallite size and higher specific surface areas. SEM micrographs revealed the formation of more prominent plate-like crystallites that were arranged as rosette clusters. H2 -TPR results showed that the promoted catalysts had lower reduction peak temperatures and possessed higher amounts of V5+-O2– and V4+-O– pairs, which gave higher selectivity and activity in the selective oxidation of n-butane to maleic anhydride.

关键词：氧化物催化剂钒磷氧化物催化性能电感耦合等离子体原子发射光谱法 Bi 镍盐 VPO催化剂扫描电子显微镜

Insecticide resistance status of Aedes aegypti and Aedes albopictus in Malaysia(2010 to 2022):A review

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Asian Pacific Journal of Tropical Medicine 2023年第10期16卷 434-445页

作者： Sabar nurul-Nastasea Ke-Xin Yu Ahmad Rohani mohamed Nor Zurainee Tengku Idzzan Nadzirah Tengku-Idris Roza Dianita Masse Rezki Sabrina Wan Mohamad Ali Wan Najdah School of Graduate Studies Management and Science UniversitySeksyen 1340100Shah AlamSelangorMalaysia Faculty of Health and Life Sciences Management and Science UniversitySeksyen 1340100 Shah AlamSelangorMalaysia Medical Entomology Unit Institute for Medical ResearchNational Institute of HealthMinistry of Health MalaysiaPersiaran Setia MurniSetia Alam40170 Shah AlamSelangorMalaysia Department of Parasitology Faculty of MedicineUniversity of Malaya50603Kuala LumpurMalaysia School of Biology Faculty of Applied SciencesUniversiti Teknologi MARA40450Shah AlamSelangorMalaysia School of Pharmaceutical Sciences Universiti Sains Malaysia11800GelugorPenangMalaysia

This review aimed to determine the prevalence of the insecticide resistance status of the field-collected Aedes(Ae.)aegypti and *** in Malaysia from 2010 to 2022 towards carbamates,organochlorines,organophosphates and *** and environmental controls were summarized with an emphasis on the mosquito vector control strategies in *** information in this review was extracted from several databases such as PubMed(MEDLINE),Science Direct and Scopus by using keywords including“insecticide resistance”,“carbamate resistance”,“organochlorine resistance”,“organophosphate resistance”,“pyrethroid resistance”,“Aedes”and“Malaysia”,between January 2022 and December *** of resistant *** and *** in Malaysia was mapped using QGIS *** resistance in both *** and *** is widespread in Malaysia,although the rates vary by *** most notable was the steep increase in permethrin resistance of *** in Selangor,Malaysia,over the past *** also displayed moderate resistance to permethrin,though not as widespread as *** in Selangor,but showed sign of resistance in Sarawak,East *** towards four main classes of insecticides have been widely documented in *** extensive resistance towards permethrin in Malaysia which is one of the current insecticides used in Malaysia suggested that policies supporting the widespread use of permethrin fogging needs further evaluation.

关键词： Aedes Pyrethroids Insecticide resistance Malaysia Vector control

Effect of hand hygiene intervention on the absenteeism of pre-school children in Klang Valley,Malaysia:a quasi-experimental study

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World Journal of Pediatrics 2020年第4期16卷 416-421页

作者： nurul Azmawati mohamed Mohd Dzulkhairi Mohd Rani Tengku Zetty Maztura Tengku Jamaluddin Zarini Ismail Shalinawati Ramli Habibah Faroque Farisha Nur Abd Samad Abdul Rashid Ariffien Aisyah Ar Redha Che Amir FaridIlina Isahak Faculty of Medicine and Health Sciences Universiti Sains Islam MalaysiaPandan Indah55100Kuala LumpurMalaysia Faculty of Medicine and Health Sciences Universiti Putra Malaysia43400SerdangSelangorMalaysia

Background Absenteeism amongst pre-school children is often due to illnesses such as hand,foot,and mouth disease,acute gastroenteritis,cold and flu,which are easily spread amongst *** is because of weak immunity and lack of knowledge on proper hand *** quasi-experimental study assessed the efficacy of an intervention consisting of a hand hygiene education programme,along with digital tools in bringing about a change in behaviour and health conditions amongst pre-school children in Klang Valley,*** A total of 377 school children,male and female,aged 5–6 years old,participated and were assigned to either the intervention or a control *** the 2 months intervention period,children in the test group were trained on proper hand hygiene practices and techniques with the aid of the interactive android-based *** numbers of absent days of all the children were recorded for 2 months before the intervention and during the *** In the test group,there was a 25%increase in the total number of absent days from the pre-intervention period to the intervention period,a much lesser increment observed as compared to that of control group in which the increase was much higher at 89%.Results showed a significant difference(P<0·05)between the absenteeism rates for the test and control group during the intervention *** These results suggest that proper education and intervention increase hand hygiene compliance,which may help decrease school absenteeism due to illness;however,a longer study duration may be necessary to evaluate the benefit further.

关键词： Absenteeism Hand hygiene Povidone-iodine Pre-school children

Glutathione (GSH) improves sperm quality and testicular morphology in streptozotocin-induced diabetic mice

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Asian Journal of Andrology 2021年第3期23卷 281-287页

作者： Fathiah Abdullah mohamed Noor Khan Nor-Ashikin Renu Agarwal Yuhaniza Shafinie Kamsani Mastura Abd Malek Nor Salmah Bakar Aqila-Akmal Mohammad Kamal Mimi-Sophia Sarbandi Nor-Shahida Abdul Rahman nurul Huda Musa Maternofetal and Embryo Research Group(MatE) Faculty of MedicineUniversiti Teknologi MARASelangor BranchSungai Buloh CampusSungai Buloh 47000SelangorMalaysia Faculty of Applied Sciences Universiti Teknologi MARAPerak BranchTapah CampusTapah Road 35400PerakMalaysia Faculty of Medicine Universiti Teknologi MARASelangor BranchSungai Buloh CampusSungai Buloh 47000SelangorMalaysia School of Medicine International Medical UniversityBukit JalilKuala Lumpur 57000Malaysia Faculty of Health Sciences Universiti Teknologi MARASelangor BranchPuncak Alam CampusBandar Puncak Alam 42300SelangorMalaysia Centre of Foundation Studies Universiti Teknologi MARASelangor BranchDengkil CampusDengkil 43800SelangorMalaysia

Diabetes mellitus(DM)is known to cause reproductive *** men,it has been linked to altered sperm quality and testicular *** stress(OS)plays a pivotal role in the development of DM ***(GSH)is a part of a nonenzymatic antioxidant defense system that protects lipid,protein,and nucleic acids from oxidative ***,the protective effects of exogenous GSH on the male reproductive system have not been comprehensively *** study determined the impact of GSH supplementation in ameliorating the adverse effect of type 1 DM on sperm quality and the seminiferous tubules of diabetic C57BL/6NTac *** at the doses of 15 mg kg^(-1)and 30 mg kg^(-1)was given intraperitoneally to mice weekly for 6 consecutive *** mice were then weighed,euthanized,and had their reproductive organs *** diabetic(D Group)showed significant impairment of sperm quality and testicular histology compared with the nondiabetic(ND Group).Diameters of the seminiferous lumen in diabetic mice treated with 15 mg kg^(-1) GSH(DGSH15)were decreased compared with the D *** motility was also significantly increased in the DGSH15 *** in testicular morphology might be an early indication of the protective roles played by the exogenous GSH in protecting sperm quality from effects of untreated type 1 DM or diabetic *** investigation using different doses and different routes of GSH is necessary to confirm this suggestion.

关键词： diabetes mellitus glutathione mice sperm quality testis histology

Direct and indirect antimicrobial effects of α-mangostin on pathogenic microorganisms

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Journal of Coastal Life Medicine 2014年第1期 70-75页

作者： nurul Huda Syed Ibrahim Muhammad Taher Deny Susanti mohamed ZaffarAli mohamed Amiroudine Qamar Uddin Ahmed Department of Biomedical Science Faculty of ScienceInternational Islamic University Malaysia25200 KuantanPahangMalaysia Department of Pharmaceutical Technology Faculty of PharmacyInternational Islamic University Malaysia25200 KuantanPahangMalaysia Department of Chemistry Faculty of ScienceInternational Islamic University Malaysia25200 KuantanPahangMalaysia Department of Pharmaceutical Chemistry Faculty of PharmacyInternational Islamic University Malaysia25200 KuantanPahangMalaysia

Objective:To test direct and indirect antimicrobial properties of α-mangostin towards a number of bacteria and ***:Activity of α-mangostin paired with an antibiotic was studied by calculating its fractional inhibitory concentration(FIC).Results:The experiment was carried out using broth microdilution and checkerboards *** showed no interaction with the combination withα-mangostin where the FIC indexes were between the range of 0.5*** of doxycycline on Pseudomonas aeruginosa fell into other set of range,FIC_(index)≥4 which is an *** activity of all four bacteria towards ampicillin,penicillin G,streptomycin and Conclusions:The FIC index is far away in the *** coupled antibiotic andα-mangostin is considered synergy in action if it lies in FIC_(index)≤0.5 and it was found that the isolated compound,α-mangostin revealed very low synergistic antimicrobial effects when coupled with antibiotics.

关键词： α-mangostin Direct Indirect Antimicrobial FIC index