Ngee Ann Polytechnic , is the second polytechnic established in Clementi, Singapore, founded in 1963 as Ngee Ann College with 116 students. It was renamed Ngee Ann Technical College in 1968, before adopting its current name in 1982.The polytechnic has an enrolment of about 16,000 full-time students, 2,000 part-time students and an alumni community of about 130,000.The campus is spread over 33.6 hectares at the fringe of the Bukit Timah residential district.The polytechnic offers 48 full-time diploma courses that cover diverse areas in business & accountancy, design & environment, engineering, film, sound & video, health science, humanities & social science, infocomm technology, mass communication, life science & chemical technology in 8 academic schools. Wikipedia.
Agency For Science, Ngee Ann Polytechnic, Temasek Polytechnic and Singapore Polytechnic | Date: 2013-05-20
A surface on a polymeric film having an array of patterned structures, wherein the array of patterned structures influences fluid flow of the surface and causes reduced attachment of a biological material.
Eugene L.W.J.,Ngee Ann Polytechnic
Journal of Medical Imaging and Health Informatics | Year: 2014
Glaucoma is caused due to increase in the pressure within the eye. The symptoms are not always obvious; hence patients may seek treatment only when the condition progressed significantly. Early treatment will decrease the chances of vision loss, and so frequent screening is necessary. Therefore, a decision support system can reduce the effort for glaucoma detection manually. In this study, an automated detection system to classify normal, mild glaucoma and severe glaucoma conditions is developed. Various entropies mean, skewness, kurtosis and Gini features were extracted from the various Discrete Wavelet Transform (DWT) coefficients. Two-level of wavelet decomposition is performed to obtain 8 different coefficient matrices. Fourteen extracted features coupled with Support Vector Machine (SVM) classifier were able to yield an accuracy of 86.7%, sensitivity of 93.3% and specificity of 95.1% using ten-fold cross validation. Copyright © 2014 American Scientific Publishers All rights reserved.
Singh G.,Ngee Ann Polytechnic |
Thomas P.B.,Ngee Ann Polytechnic
Bioresource Technology | Year: 2012
This paper explores the use of a novel microalgae membrane photoreactor (mMR) to polish the effluent from an aerobic membrane bioreactor (MBR) fed with domestic wastewater. Four microalgae species Chlorella (Chlorella sp.), Chlorella vulgaris (C. vulgaris), Scenedesmus quadricauda (S. quadricauda) and Scenedesmus dimorphus (S. dimorphus) were isolated from the environment and tested in batch reactors fed with permeate from the aerobic MBR to evaluate the nutrient removal rates for each species. All four microalgae species were able to completely remove NH 4 in the reactor within 3days. The removal rates of NO 3, NO 2 and PO 4 were between 43-54%, 83-95% and 70-92%, respectively after 3days in the batch reactor. Subsequently, an MBR-mMR system was operated for 23days. The mMR was able to remove on average 50% of NH 4, 75% of NO 2, 35% of NO 3 and 60% of PO 4 consistently from the MBR effluent under the conditions tested. © 2012 Elsevier Ltd.
Geng A.,Ngee Ann Polytechnic |
Xin F.,Ngee Ann Polytechnic |
Ip J.-Y.,Ngee Ann Polytechnic
Bioresource Technology | Year: 2012
In this study, we investigated the use of horticultural waste (HW) collected in Singapore as a renewable raw material for bioethanol production. A modified organosolv method using ethanol cooking under mild conditions followed by H 2O 2 post-treatment was investigated for HW pretreatment. It was found that the addition of acid catalysts in the pretreatment process was not critical and post-treatment using H 2O 2 was essential for the enhancement of HW digestibility. Enzymatic hydrolysis of the organosolv pretreated HW with 17.5% solid content, enzyme loading of 20FPU/gHW of filter paper cellulase, and 80CBU/gHW of β-glucosidase resulted in a HW hydrolysate containing 26.9g/L reducing sugar after 72h. Fermentation of the above hydrolysate medium produced 11.69g/L ethanol at 8h using Saccharomyces cerevisiae. It proved that horticultural waste was a potential feedstock for fuel ethanol production and organosolv pretreatment method developed in this study was effective. © 2011 Elsevier Ltd.
Zhang W.,Ngee Ann Polytechnic |
Geng A.,Ngee Ann Polytechnic
Biotechnology for Biofuels | Year: 2012
Background: Xylose is the second most abundant carbohydrate in the lignocellulosic biomass hydrolysate. The fermentation of xylose is essential for the bioconversion of lignocelluloses to fuels and chemicals. However the wild-type strains of Saccharomyces cerevisiae are unable to utilize xylose. Many efforts have been made to construct recombinant yeast strains to enhance xylose fermentation over the past few decades. Xylose fermentation remains challenging due to the complexity of lignocellulosic biomass hydrolysate. In this study, a modified genome shuffling method was developed to improve xylose fermentation by S. cerevisiae. Recombinant yeast strains were constructed by recursive DNA shuffling with the recombination of entire genome of P. stipitis with that of S. cerevisiae. Results: After two rounds of genome shuffling and screening, one potential recombinant yeast strain ScF2 was obtained. It was able to utilize high concentration of xylose (100 g/L to 250 g/L xylose) and produced ethanol. The recombinant yeast ScF2 produced ethanol more rapidly than the naturally occurring xylose-fermenting yeast, P. stipitis, with improved ethanol titre and much more enhanced xylose tolerance. Conclusion: The modified genome shuffling method developed in this study was more effective and easier to operate than the traditional protoplast-fusion-based method. Recombinant yeast strain ScF2 obtained in this study was a promising candidate for industrial cellulosic ethanol production. In order to further enhance its xylose fermentation performance, ScF2 needs to be additionally improved by metabolic engineering and directed evolution. © 2012 Zhang and Geng; licensee BioMed Central Ltd.
Ngee Ann Polytechnic | Date: 2011-11-17
This invention relates to a triple layer composite nanofiber membrane for Membrane Distillation (MD) applications. The triple layer membrane has an extremely hydrophobic nanofiber layer, a hydrophobic microporous middle layer and a hydrophilic backing layer for MD applications.
Ngee Ann Polytechnic | Date: 2013-05-27
Disclosed is a method of providing a recombinant microorganism. The method comprises the steps of: (a) providing a hybrid microorganism comprising DNA from a host microorganism and a donor microorganism; and (b) fusing DNA extracted from a second microorganism into the hybrid microorganism to form the recombinant microorganism. Also disclosed are recombinant yeasts produced by the method of the present disclosure and a method of fermenting sugar using the recombinant yeast produced by the method of the present disclosure.
Ngee Ann Polytechnic | Date: 2011-03-14
The present invention disclosed in this application relates to a method for producing glass membranes for filtration purposes. The disclosed method for producing cost effective glass membranes utilizes recycled waste glass, has shorter sintering periods and has lower sintering temperatures.
Ngee Ann Polytechnic | Date: 2011-11-11
There is provided a porous fiber having a core-shell configuration, wherein the pores on the fiber are configured to encapsulate and thereby retain a biological material therein.
Ngee Ann Polytechnic | Date: 2010-10-14
A breathing apparatus comprising: an inlet configured to receive pressurised gases, an outlet configured to diffuse the pressurised gases within the dead space of a face mask, a detachable nozzle manifold configured to pass the pressurised gases from the inlet to the outlet, and a seal configured to substantially air tight seal the nozzle manifold between a users face and a bottom inner surface of the mask.