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Search Results: 1 - 10 of 4005 matches for " Mohd Sabri Pak Dek "
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Effect of Freeze-Drying on the Antioxidant Compounds and Antioxidant Activity of Selected Tropical Fruits
Norshahida Mohamad Shofian,Azizah Abdul Hamid,Azizah Osman,Nazamid Saari,Farooq Anwar,Mohd Sabri Pak Dek,Muhammad Redzuan Hairuddin
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12074678
Abstract: The effects of freeze-drying on antioxidant compounds and antioxidant activity of five tropical fruits, namely starfruit ( Averrhoa carambola L.), mango ( Mangifera indica L.), papaya ( Carica papaya L.), muskmelon ( Cucumis melo L.), and watermelon Citruluss lanatus (Thunb.) were investigated. Significant ( p < 0.05) differences, for the amounts of total phenolic compounds (TPC), were found between the fresh and freeze-dried fruit samples, except muskmelon. There was no significant ( p > 0.05) change, however, observed in the ascorbic acid content of the fresh and freeze-dried fruits. Similarly, freeze-drying did not exert any considerable effect on β-carotene concentration of fruits, except for mango and watermelon, where significantly ( p < 0.05) higher levels were detected in the fresh samples. The results of DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging and reducing power assays revealed that fresh samples of starfruit and mango had relatively higher antioxidant activity. In case of linoleic acid peroxidation inhibition measurement, a significant ( p < 0.05) but random variation was recorded between the fresh and freeze-dried fruits. Overall, in comparison to β-carotene and ascorbic acid, a good correlation was established between the result of TPC and antioxidant assays, indicating that phenolics might have been the dominant compounds contributing towards the antioxidant activity of the fruits tested.
Histopathology and Immunohistochemistry Assessments of Acute Experimental Infection by Brucella melitensis in Bucks  [PDF]
Nurrul Shaqinah Nasruddin, Mazlina Mazlan, Mohd Zamri Saad, Hazilawati Hamzah, Jasni Sabri
Open Journal of Pathology (OJPathology) , 2014, DOI: 10.4236/ojpathology.2014.42009
Abstract:

Background: Brucellosis in male goats is characterized by arthritis, orchitis and epididymitis, which may induce infertility. Nevertheless, these lesions were categorized as chronic while acute lesions had not been described. This study investigates the histopathological and immuno histochemistry reactions in organs of bucks acutely infected by Brucella melitensis. Results: Only testis and prepuce of acutely infected bucks showed significantly severe histological lesions. Other internal organs had mild to moderate lesions. However, positive immunohistochemistry stainings were observed in organs except the bulbourethral gland. There was a significant positive correlation between the distribution of B. melitensis and IHC intensity but no significant correlation between the IHC intensity and histopathology lesions. Conclusion: The results indicate that acute brucellosis did not lead to clinical presentation, although B. melitensis was well distributed in various organs of bucks.

Photopyroelectric Spectroscopic Studies of ZnO-MnO2-Co3O4-V2O5 Ceramics
Zahid Rizwan,Azmi Zakaria,Mohd Sabri Mohd Ghazali
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12031625
Abstract: Photopyroelectric (PPE) spectroscopy is a nondestructive tool that is used to study the optical properties of the ceramics (ZnO + 0.4MnO 2 + 0.4Co 3O 4 + xV 2O 5), x = 0–1 mol%. Wavelength of incident light, modulated at 10 Hz, was in the range of 300–800 nm. PPE spectrum with reference to the doping level and sintering temperature is discussed. Optical energy band-gap ( Eg) was 2.11 eV for 0.3 mol% V 2O 5 at a sintering temperature of 1025 °C as determined from the plot ( ρhυ) 2 versus hυ. With a further increase in V 2O 5, the value of Eg was found to be 2.59 eV. Steepness factor ‘ σ A’ and ‘ σ B’, which characterize the slope of exponential optical absorption, is discussed with reference to the variation of Eg. XRD, SEM and EDAX are also used for characterization of the ceramic. For this ceramic, the maximum relative density and grain size was observed to be 91.8% and 9.5 μm, respectively.
Effect of Low Concentration Sn Doping on Optical Properties of CdS Films Grown by CBD Technique
Atefeh Jafari,Azmi Zakaria,Zahid Rizwan,Mohd Sabri Mohd Ghazali
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12096320
Abstract: Thin and transparent films of doped cadmium sulfide (CdS) were obtained on commercial glass substrates by Chemical Bath Deposition (CBD) technique. The films were doped with low concentration of Sn, and annealed in air at 300 °C for 45 min. The morphological characterization of the films with different amounts of dopant was made using SEM and EDAX analysis. Optical properties of the films were evaluated by measuring transmittance using the UV-vis spectrophotometer. A comparison of the results revealed that lower concentration of Sn doping improves transmittance of CdS films and makes them suitable for application as window layer of CdTe/CIGS solar cells.
Synthesis Mechanism of Low-Voltage Praseodymium Oxide Doped Zinc Oxide Varistor Ceramics Prepared Through Modified Citrate Gel Coating
Wan Rafizah Wan Abdullah,Azmi Zakaria,Mohd Sabri Mohd Ghazali
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13045278
Abstract: High demands on low-voltage electronics have increased the need for zinc oxide (ZnO) varistors with fast response, highly non-linear current-voltage characteristics and energy absorption capabilities at low breakdown voltage. However, trade-off between breakdown voltage and grain size poses a critical bottle-neck in the production of low-voltage varistors. The present study highlights the synthesis mechanism for obtaining praseodymium oxide (Pr 6O 11) based ZnO varistor ceramics having breakdown voltages of 2.8 to 13.3 V/mm through employment of direct modified citrate gel coating technique. Precursor powder and its ceramics were examined by means of TG/DTG, FTIR, XRD and FESEM analyses. The electrical properties as a function of Pr 6O 11 addition were analyzed on the basis of I-V characteristic measurement. The breakdown voltage could be adjusted from 0.01 to 0.06 V per grain boundary by controlling the amount of Pr 6O 11 from 0.2 to 0.8 mol%, without alteration of the grain size. The non-linearity coefficient, α, varied from 3.0 to 3.5 and the barrier height ranged from 0.56 to 0.64 eV. Breakdown voltage and α lowering with increasing Pr 6O 11 content were associated to reduction in the barrier height caused by variation in O vacancies at grain boundary.
Steel Slag as an Aggregate Replacement in Malaysian Hot Mix Asphalt
Mohd Rosli Hainin,Nur Izzi Md. Yusoff,Mohd Fahmi Mohammad Sabri,Mohd Azizi Abdul Aziz
ISRN Civil Engineering , 2012, DOI: 10.5402/2012/459016
Abstract:
Use of a Reflectance Spectroscopy Accessory for Optical Characterization of ZnO-Bi2O3-TiO2 Ceramics
Mohd Sabri Mohd Ghazali,Azmi Zakaria,Zahid Rizwan,Halimah Mohamed Kamari,Mansor Hashim,Mohd Hafiz Mohd Zaid,Reza Zamiri
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12031496
Abstract: The optical band-gap energy ( E g) is an important feature of semiconductors which determines their applications in optoelectronics. Therefore, it is necessary to investigate the electronic states of ceramic ZnO and the effect of doped impurities under different processing conditions. E g of the ceramic ZnO + xBi 2O 3 + xTiO 2, where x = 0.5 mol%, was determined using a UV-Vis spectrophotometer attached to a Reflectance Spectroscopy Accessory for powdered samples. The samples was prepared using the solid-state route and sintered at temperatures from 1140 to 1260 °C for 45 and 90 minutes. E g was observed to decrease with an increase of sintering temperature. XRD analysis indicated hexagonal ZnO and few small peaks of intergranular layers of secondary phases. The relative density of the sintered ceramics decreased and the average grain size increased with the increase of sintering temperature.
Effect of ZnO on the Physical Properties and Optical Band Gap of Soda Lime Silicate Glass
Mohd Hafiz Mohd Zaid,Khamirul Amin Matori,Sidek Hj. Abdul Aziz,Azmi Zakaria,Mohd Sabri Mohd Ghazali
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13067550
Abstract: This manuscript reports on the physical properties and optical band gap of five samples of soda lime silicate (SLS) glass combined with zinc oxide (ZnO) that were prepared by a melting and quenching process. To understand the role of ZnO in this glass structure, the density, molar volume and optical band gaps were investigated. The density and absorption spectra in the Ultra-Violet-Visible (UV-Visible) region were recorded at room temperature. The results show that the densities of the glass samples increased as the ZnO weight percentage increased. The molar volume of the glasses shows the same trend as the density: the molar volume increased as the ZnO content increased. The optical band gaps were calculated from the absorption edge, and it was found that the optical band gap decreased from 3.20 to 2.32 eV as the ZnO concentration increased.
Effect of Annealing Temperature on the Optical Spectra of CdS Thin Films Deposited at Low Solution Concentrations by Chemical Bath Deposition (CBD) Technique
Zahid Rizwan,Azmi Zakaria,Mohd Sabri Mohd Ghazali,Atefeh Jafari,Fasih Ud Din,Reza Zamiri
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12021293
Abstract: Two different concentrations of CdCl 2 and (NH 2) 2CS were used to prepare CdS thin films, to be deposited on glass substrate by chemical bath deposition (CBD) technique. CdCl 2 (0.000312 M and 0.000625 M) was employed as a source of Cd 2+ while (NH 2) 2CS (0.00125 M and 0.000625 M) for S 2? at a constant bath temperature of 70 °C. Adhesion of the deposited films was found to be very good for all the solution concentrations of both reagents. The films were air-annealed at a temperature between 200 °C to 360 °C for one hour. The minimum thickness was observed to be 33.6 nm for film annealed at 320 °C. XRD analyses reveal that the films were cubic along with peaks of hexagonal phase for all film samples. The crystallite size of the films decreased from 41.4 nm to 7.4 nm with the increase of annealing temperature for the CdCl 2 (0.000312 M). Optical energy band gap ( Eg), Urbach energy ( Eu) and absorption coefficient ( α) have been calculated from the transmission spectral data. These parameters have been discussed as a function of annealing temperature and solution concentration. The best transmission (about 97%) was obtained for the air-annealed films at higher temperature at CdCl 2 (0.000312 M).
Nematode antimicrobial peptides
DEK Tarr
Invertebrate Survival Journal , 2012,
Abstract: ISJ 9: 122-133, 2012 ISSN 1824-307XThere is currently insufficient data to determine the full spectrum of antimicrobial peptides (AMPs) that nematodes produce. Defensins, nemapores, cecropins, and caenacins/neuropeptide-like proteins have been identified, but none of these is produced universally by all nematode species, and no single species produces all AMP types. Therefore, it seems unlikely that there is a core set of AMPs that can be considered “archetypal” for nematodes. Additional information is also needed from under-represented Ecdysozoan and Lophotrochozoan taxa to clarify the evolution of AMPs. To avoid generalizations that may later prove inaccurate, caution should be used when choosing “representative” sequences or taxa, and analyses should be interpreted conservatively when limited information is available.
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