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Displaying publications 61 - 67 of 67 in total

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Extractive fermentation for improved production and recovery of lipase derived from Burkholderia cepacia using a thermoseparating polymer in aqueous two-phase systems

Show PL, Tan CP, Shamsul Anuar M, Ariff A, Yusof YA, Chen SK, et al.

Bioresour Technol, 2012 Jul;116:226-33.
PMID: 22061444 DOI: 10.1016/j.biortech.2011.09.131

An extractive fermentation technique was developed using a thermoseparating reagent to form a two-phase system for simultaneous cell cultivation and downstream processing of extracellular Burkholderia cepacia lipase. A 10% (w/w) solution of ethylene oxide-propylene oxide (EOPO) with a molecular mass of 3900 g/mol and pH 8.5, a 200 rpm speed, and 30 °C were selected as the optimal conditions for lipase production (55 U/ml). Repetitive batch fermentation was performed by continuous replacement of the top phase every 24h, which resulted in an average cell growth mass of 4.7 g/L for 10 extractive batches over 240 h. In scaling-up the process, a bench-scale bioreactor was tested under the conditions that had been optimized in flasks. The production rate and recovery yield were higher in the bioreactor compared to fermentation performed in flasks.

Matched MeSH terms: Polypropylenes/pharmacology*
Absorbable versus nonabsorbable sutures for subcuticular skin closure of a transverse suprapubic incision

Tan PC, Mubarak S, Omar SZ

Int J Gynaecol Obstet, 2008 Nov;103(2):179-81.
PMID: 18639876 DOI: 10.1016/j.ijgo.2008.05.023
Matched MeSH terms: Polypropylenes
Fulltext Resection of large primary chest wall chondrosarcoma with reconstruction: 2 case reports

Wong PS, Tan GP

Med J Malaysia, 2000 Dec;55(4):516-9.
PMID: 11221168

We report two cases of large chest wall primary chondrosarcoma, one of the sternum and the other of the lateral chest wall. Both were treated by radical resection and reconstruction using marlex mesh and methyl methacrylate "sandwich" prosthesis and pedicled latissiumus dorsi flap.

Matched MeSH terms: Polypropylenes
Chest wall resection and reconstruction: a case series of 20 patients in Hospital Kuala Lumpur, Malaysia

Dharmaraj B, Diong NC, Shamugam N, Sathiamurthy N, Mohd Zainal H, Chai SC, et al.

Indian J Thorac Cardiovasc Surg, 2021 Jan;37(1):82-88.
PMID: 33442211 DOI: 10.1007/s12055-020-00972-7

Chest wall resection is defined as partial or full-thickness removal of the chest wall. Significant morbidity has been recorded, with documented respiratory failure as high as 27%. Medical records of all patients who had undergone chest wall resection and reconstruction were reviewed. Patients' demographics, length of surgery, reconstruction method, size of tumor and chest wall defect, histopathological result, complications, duration of post-operative antibiotics, and hospital stay were assessed. From 1 April 2017 to 30 April 2019, a total of 20 patients underwent chest wall reconstructive surgery. The median age was 57 years, with 12 females and 8 males. Fourteen patients (70%) had malignant disease and 6 patients (30%) had benign disease. Nine patients underwent rigid reconstruction (titanium mesh for sternum and titanium plates for ribs), 6 patients had non-rigid reconstruction (with polypropylene or composite mesh), and 5 patients had primary closure. Nine patients (45%) required closure with myocutaneous flap. Complications were noted in 70% of patients. Patients who underwent primary closure had minor complications. In total, 66.7% of patients who had closure with either fasciocutaneous or myocutaneous flaps had threatened flap necrosis. Two patients developed pneumonia and 3 patients (15%) had respiratory failure requiring tracheostomy and prolonged ventilation. There was 1 mortality (5%) in this series. In conclusion, chest wall resections involving large defects require prudent clinical judgment and multidisciplinary assessments in determining the choice of chest wall reconstruction to improve outcomes.

Matched MeSH terms: Polypropylenes
Fulltext Detection of microplastics in human colectomy specimens

Ibrahim YS, Tuan Anuar S, Azmi AA, Wan Mohd Khalik WMA, Lehata S, Hamzah SR, et al.

JGH Open, 2021 Jan;5(1):116-121.
PMID: 33490620 DOI: 10.1002/jgh3.12457

Background and Aim: While dietary exposure to microplastics is increasingly recognized, it is unknown if ingested plastics remain within the digestive tract. We aimed to examine human colectomy specimens for microplastics and to report the characteristics as well as polymer composition of the particles.
Methods: Colectomy samples were obtained from 11 adults (mean age 45.7, six males) who were residents of Northeastern Peninsular Malaysia. Microplastics were identified following chemical digestion of specimens and subsequent filtration. The samples were then examined for characteristics (abundance, length, shape, and color) and composition of three common polymer types using stereo- and Fourier Transform InfraRed (FTIR) microscopes.
Results: Microplastics were detected in all 11 specimens with an average of 331 particles/individual specimen or 28.1 ± 15.4 particles/g tissue. Filaments or fibers accounted for 96.1% of particles, and 73.1% of all filaments were transparent. Out of 40 random filaments from 10 specimens (one had indeterminate spectra patterns), 90% were polycarbonate, 50% were polyamide, and 40% were polypropylene.
Conclusion: Our study suggests that microplastics are ubiquitously present in the human colon.

Matched MeSH terms: Polypropylenes
Fulltext Electrical resistivity, thermal stability and tensile strength of rice husk flour-plastic waste composites

Shahril Anuar Bahari, Kamrie Kamlon, Masitah Abu Kassim

Scientific Research Journal, 2012;9(2):0-0.
MyJurnal

In this study, the rice husk flour-plastic waste composites (RPC) was produced from polypropylene (PP) and high density polyethylene (HDPE) wastes with 30 and 50% rice husk flour (RHF) contents. RPC was made by melt compounding and compression moulding processes. The electrical resistivity, thermal stability and tensile strength of RPC were determined. The RPC was tested in electrical resistivity and tensile strength according to the ASTM D-257 and ASTM D-638 respectively, while thermal stability was tested using thermogravimetric analysis (TGA) method. From the results, high content of RHF reduces all properties, except for tensile modulus of elasticity (TMOE) in tensile strength test. The ability of moisture absorption and the presence of hemicelluloses, cellulose and silica in RHF reduce the electrical resistivity and thermal stability behaviour of RPC from 50% RHF. The good binding elements and filler agglomeration in RPC from 50% RHF improve only TMOE. Insufficient stress transfer and rigid interphase occurred between RHF and plastics during tensile maximum load and elongation at break (Eb) in tensile strength test. In general, RPC from HDPE indicates better thermal stability, tensile modulus of rupture and Eb (in tensile strength test) compared to PP, based on the good behaviour of thermal conductivity, low water absorption, high molecular weight and good elongation properties of HDPE. However, RPC from PP shows good electrical resistance due to the low thermal expansion coefficient of PP.

Matched MeSH terms: Polypropylenes
Fulltext Successful laparoscopic management of combined traumatic diaphragmatic rupture and abdominal wall hernia: a case report

Siow SL, Wong CM, Hardin M, Sohail M

J Med Case Rep, 2016 Jan 18;10:11.
PMID: 26781191 DOI: 10.1186/s13256-015-0780-8

Traumatic diaphragmatic rupture and traumatic abdominal wall hernia are two well-described but rare clinical entities associated with blunt thoracoabdominal injuries. To the best of our knowledge, the combination of these two clinical entities as a result of a motor vehicle accident has not been previously reported.

Matched MeSH terms: Polypropylenes