MyMedR

Displaying publications 21 - 25 of 25 in total

Abstract:

Sort:

Solid acid catalysts pretreatment and enzymatic hydrolysis of macroalgae cellulosic residue for the production of bioethanol

Tan IS, Lee KT

Carbohydr Polym, 2015 Jun 25;124:311-21.
PMID: 25839825 DOI: 10.1016/j.carbpol.2015.02.046

The aim of this study is to investigate the technical feasibility of converting macroalgae cellulosic residue (MCR) into bioethanol. An attempt was made to present a novel, environmental friendly and economical pretreatment process that enhances enzymatic conversion of MCR to sugars using Dowex (TM) Dr-G8 as catalyst. The optimum yield of glucose reached 99.8% under the optimal condition for solid acid pretreatment (10%, w/v biomass loading, 4%, w/v catalyst loading, 30min, 120°C) followed by enzymatic hydrolysis (45FPU/g of cellulase, 52CBU/g of β-glucosidase, 50°C, pH 4.8, 30h). The yield of sugar obtained was found more superior than conventional pretreatment process using H2SO4 and NaOH. Biomass loading for the subsequent simultaneous saccharification and fermentation (SSF) of the pretreated MCR was then optimized, giving an optimum bioethanol yield of 81.5%. The catalyst was separated and reused for six times, with only a slight drop in glucose yield.

Matched MeSH terms: Resins, Synthetic/chemistry
Cytotoxicity of Fast-set Conventional and Resin-modified Glass Ionomer Cement Polymerized at Different Times on SHED

Mohd Zainal Abidin R, Luddin N, Shamsuria Omar N, Mohamed Aly Ahmed H

J Clin Pediatr Dent, 2015;39(3):235-40.
PMID: 26208068 DOI: 10.17796/1053-4628-39.3.235

To compare the cytotoxicity of conventional GIC and Resin Modified GIC (RMGIC) polymerized at 2 different times on stem cells from human exfoliated deciduous teeth (SHED).

Matched MeSH terms: Resins, Synthetic/toxicity
Fulltext Annular closure device for disc herniation: meta-analysis of clinical outcome and complications

Choy WJ, Phan K, Diwan AD, Ong CS, Mobbs RJ

BMC Musculoskelet Disord, 2018 Aug 16;19(1):290.
PMID: 30115053 DOI: 10.1186/s12891-018-2213-5

BACKGROUND: Lumbar intervertebral disc herniation is a common cause of lower back and leg pain, with surgical intervention (e.g. discectomy to remove the herniated disc) recommended after an appropriate period of conservative management, however the existing or increased breach of the annulus fibrosus persists with the potential of reherniation. Several prosthesis and techniques to reduce re-herniation have been proposed including implantation of an annular closure device (ACD) - Barricaid™ and an annular tissue repair system (AR) - Anulex-Xclose™. The aim of this meta-analysis is to assist surgeons determine a potential approach to reduce incidences of recurrent lumbar disc herniation and assess the current devices regarding their outcomes and complications.
METHODS: Four electronic full-text databases were systematically searched through September 2017. Data including outcomes of annular closure device/annular repair were extracted. All results were pooled utilising meta-analysis with weighted mean difference and odds ratio as summary statistics.
RESULTS: Four studies met inclusion criteria. Three studies reported the use of Barricaid (ACD) while one study reported the use of Anulex (AR). A total of 24 symptomatic reherniation were reported among 811 discectomies with ACD/AR as compared to 51 out of 645 in the control group (OR: 0.34; 95% CI: 0.20,0.56; I2 = 0%; P

Matched MeSH terms: Resins, Synthetic/adverse effects; Resins, Synthetic/therapeutic use*
Structure-property studies of thermoplastic and thermosetting polyurethanes using palm and soya oils-based polyols

Mohammed IA, Al-Mulla EA, Kadar NK, Ibrahim M

J Oleo Sci, 2013;62(12):1059-72.
PMID: 24292358

Palm and soya oils were converted to monoglycerides via transesterification of triglycerides with glycerol by one step process to produce renewable polyols. Thermoplastic polyurethanes (TPPUs) were prepared from the reaction of the monoglycerides which act as polyol with 4,4'-methylenediphenyldiisocyanate (MDI) whereas, thermosetting polyurethanes (TSPUs) were prepared from the reaction of glycerol, MDI and monoglycerides in one pot. Characterization of the polyurethanes was carried out by FT-IR, (1)H NMR, and iodine value and sol-gel fraction. The TSPUs showed good thermal properties compared to TPPUs as well as TSPUs exhibits good properties in pencil hardness and adhesion, however poorer in flexural and impact strength compared to TPPUs. The higher percentage of cross linked fraction, the higher degree of cross linking occurred, which is due to the higher number of double bond presents in the TSPUs. These were reflected in iodine value test as the highest iodine value of the soya-based thermosetting polyurethanes confirmed the highest degree of cross linking. Polyurethanes based on soya oil showed better properties compared to palm oil. This study is a breakthrough development of polyurethane resins using palm and soya oils as one of the raw materials.

Matched MeSH terms: Resins, Synthetic
Sealing ability of various restorative materials as coronal barriers between endodontic appointments

Tapsir Z, Aly Ahmed HM, Luddin N, Husein A

J Contemp Dent Pract, 2013 Jan 1;14(1):47-50.
PMID: 23579892

To evaluate and compare the microleakage of various restorative materials used as coronal barriers between endodontic appointments.

Matched MeSH terms: Resins, Synthetic/chemistry