Browse publications by year: 2014

  1. Wahab RA, Basri M, Rahman RN, Salleh AB, Rahman MB, Chaibakhsh N, et al.
    Biotechnology, biotechnological equipment, 2014 Nov 02;28(6):1065-1072.
    PMID: 26740782
    Most substrate for esterification has the inherent problem of low miscibility which requires addition of solvents into the reaction media. In this contribution, we would like to present an alternative and feasible option for an efficient solvent-free synthesis of menthyl butyrate using a novel thermostable crude T1 lipase. We investigated the effects of incubation time, temperature, enzyme loading and substrate molar ratio and determined the optimum conditions. The high conversion of menthyl butyrate catalyzed by crude T1 lipase in a solvent-free system is greatly affected by temperature and time of the reaction media. The highest yield of menthyl butyrate was 99.3% under optimized conditions of 60 °C, incubation time of 13.15 h, 2.53 mg, 0.43% (w/w) enzyme to substrate ratio and at molar ratio of butyric anhydride/menthol 2.7:1. Hence, the investigation revealed that the thermostable crude T1 lipase successfully catalyzed the high-yield production of menthyl butyrate in a solvent-free system. The finding suggests that the crude T1 lipase was a promising alternative to overcome shortcomings associated with solvent-assisted enzymatic reactions.
    MeSH terms: Anhydrides; Bacterial Proteins; Butyrates; Catalysis; Esterification; Lipase; Menthol; Solvents; Temperature
  2. Neoh CF, Snell GI, Levvey B, Kotsimbos T, Morrissey O, Slavin MA, et al.
    Med J Aust, 2014 Nov 03;201(9):543-4.
    PMID: 25358582
    MeSH terms: Antifungal Agents/administration & dosage; Antifungal Agents/adverse effects*; Aspergillosis/drug therapy; Australia; Bronchitis/drug therapy; Bronchitis/microbiology; Carcinoma, Squamous Cell/chemically induced*; Female; Humans; Middle Aged; Skin Neoplasms/chemically induced*; Tracheitis/drug therapy; Tracheitis/microbiology; Lung Transplantation; Keratosis, Actinic/chemically induced; Voriconazole/administration & dosage; Voriconazole/adverse effects*; Transplant Recipients*
  3. Chui PL, Abdullah KL, Wong LP, Taib NA
    BMC Complement Altern Med, 2014 Oct 30;14:425.
    PMID: 25358688 DOI: 10.1186/1472-6882-14-425
    BACKGROUND: The inclusion of prayer-for-health (PFH) in the definition of complementary alternative medicine (CAM) has resulted in higher levels of CAM use. The objective of this study was to assess PFH and CAM use among breast cancer patients undergoing chemotherapy.

    METHODS: A cross-sectional study was performed at two chemotherapy providers. Patients were questioned about use of three categories of CAM, mind-body practices (MBPs), natural products (NPs) and traditional medicine (TM). PFH was also examined separately from CAM to better characterise the patterns of CAM and PFH used during chemotherapy.

    RESULTS: A total of 546 eligible patients participated in the study; 70.7% (n = 386) reported using some form of CAM, and 29.3% (n = 160) were non-CAM users. When PFH was excluded as a CAM, fewer patients reported the use of CAM (66.1%; n = 361). The total number of patients who used MBPs decreased from 342 to 183. The most common CAM use category was NPs (82.8%), followed by MBPs (50.7%), and TM (35.7%). CAM users were more likely to have a tertiary education (OR 2.11, 95% CI 1.15-3.89 vs. primary/lower), have household incomes > RM 3,000 (≈944 USD) per month (OR 2.32, 95% CI 1.40-3.84 vs. ≤RM 3,000 (≈944 USD)), and have advanced cancer (OR 1.75, 95% CI 1.18-2.59 vs. early stage cancer), compared with non-CAM users. The CAM users were less likely to have their chemotherapy on schedule (OR 0.24, 95% CI 0.10-0.58 vs. chemotherapy postponed) than non-CAM users. Most MBPs were perceived to be more helpful by their users, compared with the users of NPs and TM.

    CONCLUSION: CAM use was prevalent among breast cancer patients. Excluding PFH from the definition of CAM reduced the prevalence of overall CAM use. Overall, CAM use was associated with higher education levels and household incomes, advanced cancer and lower chemotherapy schedule compliance. Many patients perceived MBP to be beneficial for improving overall well-being during chemotherapy. These findings, while preliminary, clearly indicate the differences in CAM use when PFH is included in, and excluded from, the definition of CAM.

    MeSH terms: Adult; Aged; Complementary Therapies*; Antineoplastic Agents/therapeutic use; Breast Neoplasms/drug therapy; Breast Neoplasms/psychology; Breast Neoplasms/therapy*; Cross-Sectional Studies; Female; Humans; Malaysia; Middle Aged; Perception; Religion; Faith Healing*
  4. Chandrasekaran H, Govind SK, Panchadcharam C, Bathmanaban P, Raman K, Thergarajan G
    Parasit Vectors, 2014;7:469.
    PMID: 25358755 DOI: 10.1186/s13071-014-0469-7
    Blastocystis sp., a widely prevalent intestinal protozoan parasite is found in a wide range of animals, including humans. The possibility of zoonotic transmission to human from birds especially ostriches led us to investigate on the cross infectivity of Blastocystis sp. isolated from the ostrich feces as well as the phenotypic and subtype characteristics. There is a need to investigate this especially with the rising number of ostrich farms due to the growing global ostrich industry.
    MeSH terms: Animals; Bird Diseases/parasitology*; Female; Male; DNA, Protozoan/genetics; Blastocystis Infections/parasitology; Blastocystis Infections/veterinary*; Blastocystis/classification*; Blastocystis/metabolism*; Rats, Sprague-Dawley; Struthioniformes*; Lipid Metabolism/physiology*; Rats
  5. Atangwho IJ, Yin KB, Umar MI, Ahmad M, Asmawi MZ
    PMID: 25358757 DOI: 10.1186/1472-6882-14-426
    This study evaluated the impact of Vernonia amygdalina (VA) on the transcription of key enzymes involved in cellular modulation of glucose in streptozotocin-induced diabetic rats in a bid to understand the possible anti-diabetic mechanism of VA.
    MeSH terms: Adipose Tissue/metabolism; Animals; Blood Glucose/metabolism; Body Weight/drug effects; Diabetes Mellitus, Experimental/drug therapy; Diabetes Mellitus, Experimental/enzymology*; Diabetes Mellitus, Experimental/metabolism; Gluconeogenesis/drug effects*; Glucose/metabolism*; Glucose-6-Phosphatase/metabolism; Glucosephosphate Dehydrogenase/genetics; Glucosephosphate Dehydrogenase/metabolism; Glycolysis/drug effects; Hexokinase/metabolism; Hypoglycemic Agents/pharmacology; Hypoglycemic Agents/therapeutic use; Liver/drug effects*; Liver/enzymology; Liver/metabolism; Male; Phytotherapy; Muscles/metabolism; Oxidation-Reduction; Pentose Phosphate Pathway/drug effects*; Plant Extracts/pharmacology*; Plant Extracts/therapeutic use; Gene Expression; Phosphatidylinositol 3-Kinases/metabolism; Vernonia*; Rats
  6. Jatoi MA, Kamel N, Malik AS, Faye I
    Australas Phys Eng Sci Med, 2014 Dec;37(4):713-21.
    PMID: 25359588 DOI: 10.1007/s13246-014-0308-3
    Human brain generates electromagnetic signals during certain activation inside the brain. The localization of the active sources which are responsible for such activation is termed as brain source localization. This process of source estimation with the help of EEG which is also known as EEG inverse problem is helpful to understand physiological, pathological, mental, functional abnormalities and cognitive behaviour of the brain. This understanding leads for the specification for diagnoses of various brain disorders such as epilepsy and tumour. Different approaches are devised to exactly localize the active sources with minimum localization error, less complexity and more validation which include minimum norm, low resolution brain electromagnetic tomography (LORETA), standardized LORETA, exact LORETA, Multiple Signal classifier, focal under determined system solution etc. This paper discusses and compares the ability of localizing the sources for two low resolution methods i.e., sLORETA and eLORETA respectively. The ERP data with visual stimulus is used for comparison at four different time instants for both methods (sLORETA and eLORETA) and then corresponding activation in terms of scalp map, slice view and cortex map is discussed.
    MeSH terms: Algorithms*; Brain Mapping/methods*; Computer Simulation; Electroencephalography/methods*; Electroencephalography/standards; Female; Humans; Male; Models, Neurological*; Nerve Net/physiology*; Pattern Recognition, Automated/methods; Sensitivity and Specificity; Software; Visual Cortex/physiology*; Reproducibility of Results
  7. Annavi G, Newman C, Buesching CD, Macdonald DW, Burke T, Dugdale HL
    Ecol Evol, 2014 Jun;4(12):2594-609.
    PMID: 25360289 DOI: 10.1002/ece3.1112
    HFCs (heterozygosity-fitness correlations) measure the direct relationship between an individual's genetic diversity and fitness. The effects of parental heterozygosity and the environment on HFCs are currently under-researched. We investigated these in a high-density U.K. population of European badgers (Meles meles), using a multimodel capture-mark-recapture framework and 35 microsatellite loci. We detected interannual variation in first-year, but not adult, survival probability. Adult females had higher annual survival probabilities than adult males. Cubs with more heterozygous fathers had higher first-year survival, but only in wetter summers; there was no relationship with individual or maternal heterozygosity. Moist soil conditions enhance badger food supply (earthworms), improving survival. In dryer years, higher indiscriminate mortality rates appear to mask differential heterozygosity-related survival effects. This paternal interaction was significant in the most supported model; however, the model-averaged estimate had a relative importance of 0.50 and overlapped zero slightly. First-year survival probabilities were not correlated with the inbreeding coefficient (f); however, small sample sizes limited the power to detect inbreeding depression. Correlations between individual heterozygosity and inbreeding were weak, in line with published meta-analyses showing that HFCs tend to be weak. We found support for general rather than local heterozygosity effects on first-year survival probability, and g2 indicated that our markers had power to detect inbreeding. We emphasize the importance of assessing how environmental stressors can influence the magnitude and direction of HFCs and of considering how parental genetic diversity can affect fitness-related traits, which could play an important role in the evolution of mate choice.
    MeSH terms: Animals; Fathers; Female; Food Supply; Heterozygote; Inbreeding; Male; Masks; Oligochaeta; Probability; Soil; Genetic Variation; Sample Size; Microsatellite Repeats; Mustelidae; Inbreeding Depression
  8. Yap HJ, Taha Z, Dawal SZ, Chang SW
    PLoS One, 2014;9(10):e109692.
    PMID: 25360663 DOI: 10.1371/journal.pone.0109692
    Traditional robotic work cell design and programming are considered inefficient and outdated in current industrial and market demands. In this research, virtual reality (VR) technology is used to improve human-robot interface, whereby complicated commands or programming knowledge is not required. The proposed solution, known as VR-based Programming of a Robotic Work Cell (VR-Rocell), consists of two sub-programmes, which are VR-Robotic Work Cell Layout (VR-RoWL) and VR-based Robot Teaching System (VR-RoT). VR-RoWL is developed to assign the layout design for an industrial robotic work cell, whereby VR-RoT is developed to overcome safety issues and lack of trained personnel in robot programming. Simple and user-friendly interfaces are designed for inexperienced users to generate robot commands without damaging the robot or interrupting the production line. The user is able to attempt numerous times to attain an optimum solution. A case study is conducted in the Robotics Laboratory to assemble an electronics casing and it is found that the output models are compatible with commercial software without loss of information. Furthermore, the generated KUKA commands are workable when loaded into a commercial simulator. The operation of the actual robotic work cell shows that the errors may be due to the dynamics of the KUKA robot rather than the accuracy of the generated programme. Therefore, it is concluded that the virtual reality based solution approach can be implemented in an industrial robotic work cell.
    MeSH terms: Computer Simulation; Humans; Laboratories; Robotics/methods*; Software*; User-Computer Interface*; Reproducibility of Results; Imaging, Three-Dimensional; Manufacturing Industry/education; Manufacturing Industry/methods*
  9. Nathan AM, Rani F, Lee RJ, Zaki R, Westerhout C, Sam IC, et al.
    PLoS One, 2014;9(10):e111162.
    PMID: 25360811 DOI: 10.1371/journal.pone.0111162
    Lower respiratory tract infections (LRTIs) are an important cause of morbidity and mortality, especially in low income countries. The aim of this study was to determine risk factors of life-threatening LRTIs in hospitalised children in Malaysia.
    MeSH terms: Adolescent; Age Factors; Bacterial Infections/microbiology; Bacterial Infections/mortality; Child; Child, Preschool; Female; Hospitalization; Humans; Infant; Infant, Newborn; Malaysia/epidemiology; Male; Respiratory Tract Infections/microbiology; Respiratory Tract Infections/mortality*; Retrospective Studies; Risk Factors; Urban Population*; Virus Diseases/mortality; Virus Diseases/virology
  10. Ghasemzadeh A, Nasiri A, Jaafar HZ, Baghdadi A, Ahmad I
    Molecules, 2014 Oct 30;19(11):17632-48.
    PMID: 25361426 DOI: 10.3390/molecules191117632
    In the current study, changes in secondary metabolite synthesis and the pharmaceutical quality of sabah snake grass leaves and buds were considered in relation to plant age (1 month, 6 months, and 1 year old). The activity of the enzyme chalcone synthase (CHS, EC 2.3.1.74) was measured, as it is a key enzyme for flavonoid production. Significant differences in total flavonoid (TF) production were observed between the three plant growth periods and the different plant parts. The highest contents of TF (6.32 mg/g dry weight [DW]) and total phenolic (TP) (18.21 mg/g DW) were recorded in 6-month-old buds. Among the flavonoids isolated in this study the most important ones based on concentration were from high to low as follows: catechin > quercetin > kaempferol > luteolin. Production of phenolic acids increased from 1 to 6 months, but after 6 months up to 1 year of age, they decreased significantly. The highest contents of caffeic acid (0.307 mg/g DW) and gallic acid (5.96 mg/g DW) were recorded in 1-year and 6-month-old buds, respectively. The lowest and highest activity of CHS was recorded in 1-month and 6-month-old buds with values of 3.6 and 9.5 nkat/mg protein, respectively. These results indicate that the increment in flavonoids and phenolic acids in 6-month-old buds can be attributed to an increase in CHS activity. The highest 1,1-diphenyl-2-picrylhydrazyl (DPPH) activity was observed in the extract of 1-year-old buds followed by 6-month-old buds, with 50% of free radical scavenging (IC50) values of 64.6 and 73.5 µg/mL, respectively. Interestingly, a ferric reducing antioxidant power (FRAP) assay showed a higher activity in 6-month-old buds (488 μM of Fe(II)/g) than in 1-year-old buds (453 μM of Fe(II)/g), in contrast to the DPPH result. Significant correlations (p < 0.05) were observed between CHS enzyme activity and FRAP activity, TF, catechin, and kaempferol content. Extracts of 6-month-old bud exhibited a significant in vitro anticancer activity against HeLa cancer cells with IC50 value of 56.8 µg/mL. These results indicate that early harvesting of snake grass (6-month-old) may yield increased concentrations of secondary metabolites, which are potent antioxidant compounds.
    MeSH terms: Acyltransferases/pharmacology*; Acyltransferases/chemistry*; Antioxidants/pharmacology; Antioxidants/chemistry; Biphenyl Compounds/chemistry; Caffeic Acids/chemistry; Catechin/chemistry; Flavonoids/pharmacology; Flavonoids/chemistry; Gallic Acid/chemistry; Poaceae/chemistry*; HeLa Cells; Humans; Phenols/chemistry; Picrates/chemistry; Plant Extracts/pharmacology*; Plant Extracts/chemistry*; Quercetin/chemistry; Free Radical Scavengers/pharmacology; Free Radical Scavengers/chemistry; Plant Leaves/chemistry; Acanthaceae/chemistry*; Kaempferols/chemistry; Cell Line, Tumor; Luteolin/chemistry; Hydroxybenzoates/chemistry
  11. Krishnappa P, Mohamad IB, Lin YJ, Barua A
    Diagn Pathol, 2014;9:202.
    PMID: 25361681 DOI: 10.1186/s13000-014-0202-z
    Cervical cancer is one of the most common cancers affecting women worldwide. It is well established that human papilloma virus (HPV) infection is the prime risk factor in the development of cervical cancer. The current screening and diagnostic tests have limitations in identifying the range of lesions caused by HPV. The current study aims to evaluate the diagnostic value of p16 immunohistochemical (IHC) investigation in high-risk human papillomavirus (HR-HPV) related lesions of the uterine cervix in Hospital Tuanku Jaafar, Seremban, Malaysia.
    MeSH terms: Adult; Aged; Aged, 80 and over; Biopsy; Carcinoma in Situ/diagnosis; Carcinoma in Situ/metabolism; Carcinoma in Situ/virology; Uterine Cervicitis/diagnosis; Uterine Cervicitis/metabolism; Uterine Cervical Neoplasms/diagnosis; Uterine Cervical Neoplasms/metabolism*; Uterine Cervical Neoplasms/virology*; Cervix Uteri/metabolism*; Cervix Uteri/pathology; Cervix Uteri/virology; Diagnosis, Differential; Female; Gene Expression Regulation; Humans; Malaysia; Middle Aged; Risk Factors; Sensitivity and Specificity; Biomarkers, Tumor/genetics; Biomarkers, Tumor/metabolism*; Gene Expression Regulation, Neoplastic; Cyclin-Dependent Kinase Inhibitor p16/genetics; Cyclin-Dependent Kinase Inhibitor p16/metabolism*; Papillomavirus Infections/complications*; Human papillomavirus 16*
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