MyMedR

Displaying publications 61 - 80 of 1003 in total

Abstract:

Sort:

Exploring the additive bio-agent impacts upon ectoine production by Halomonas salina DSM5928T using corn steep liquor and soybean hydrolysate as nutrient supplement

Chen PW, Cui ZY, Ng HS, Chi-Wei Lan J

J Biosci Bioeng, 2020 Aug;130(2):195-199.
PMID: 32370929 DOI: 10.1016/j.jbiosc.2020.03.011

Ectoine production using inexpensive and renewable biomass resources has attracted great interest among the researchers due to the low yields of ectoine in current fermentation approaches that complicate the large-scale production of ectoine. In this study, ectoine was produced from corn steep liquor (CSL) and soybean hydrolysate (SH) in replacement to yeast extract as the nitrogen sources for the fermentation process. To enhance the bacterial growth and ectoine production, biotin was added to the Halomonas salina fermentation media. In addition, the effects addition of surfactants such as Tween 80 and saponin on the ectoine production were also investigated. Results showed that both the CSL and SH can be used as the nitrogen source substitutes in the fermentation media. Higher amount of ectoine (1781.9 mg L-1) was produced in shake flask culture with SH-containing media as compared to CSL-containing media. A total of 2537.0 mg L-1 of ectoine was produced at pH 7 when SH-containing media was applied in the 2 L batch fermentation. Moreover, highest amount of ectoine (1802.0 mg L-1) was recorded in the SH-containing shake flask culture with addition of 0.2 μm mL-1 biotin. This study demonstrated the efficacy of industrial waste as the nutrient supplement for the fermentation of ectoine production.

Matched MeSH terms: Culture Media/metabolism; Culture Media/chemistry; Batch Cell Culture Techniques
Fulltext Empirical Performance Analysis of Hyperledger LTS for Small and Medium Enterprises

Khan D, Jung LT, Hashmani MA, Cheong MK

Sensors (Basel), 2022 Jan 25;22(3).
PMID: 35161661 DOI: 10.3390/s22030915

The massive success of blockchain technology in Bitcoin is taking the world by storm by attracting vast acceptance from both the public and private sectors. Blockchain allows digital transactions between two parties without a third party as a broker. Blockchain is now applicable beyond fintech to various other industries. Among these, Hyperledger fabric has emerged as the most popular blockchain-based open-source permissioned platform targeting business applications. It has been used in over 400 proofs-of-concept blockchain and is well proven in applications, such as supply chain, healthcare, and so on. Despite the many obvious benefits observed in blockchain-enhanced platforms, there still exist technical challenges in scalability, causing performance deficiency, which includes latency and throughput. There is an exigent need to improve the current blockchain-based applications to have the blockchain nodes be scalable without compromising the blockchain performance. In this study, we present the impact of workload variance of up to 1000 transactions with the setup of 20 blockchain nodes in the Hyperledger LTS platform. The evaluation metrics are transaction success and failure rate, throughput, and latency in the blockchain. The transaction throughput was found to be consistent with the increasing workload on a constant number of nodes. However, it showed a declining trend with an increasing number of nodes. As far as the latency, it was in tandem with the increased workload and the number of nodes. We, therefore, conclude that the LTS version is suitable for small and medium enterprises that do not scale up.

Matched MeSH terms: Culture Media
Media composition to revive leptospires stored at -80 °C

Philip N, Neela VK

Cryobiology, 2022 Dec;109:89-93.
PMID: 36179819 DOI: 10.1016/j.cryobiol.2022.09.007

Leptospires are preserved by frequent sub-culturing in semisolid media due to the challenge of low recovery by freezing or liquid nitrogen methods. The present study evaluated three liquid EMJH medium compositions (Medium A: Leptospira medium base EMJH, Leptospira enrichment EMJH, 5-fluorouracil (3%), rabbit serum (1%) and calf serum (1%); Medium B: same as Medium A but without 5-fluorouracil; Medium C: same as Medium B but with the addition of sodium pyruvate) for the revival of leptospires after storage at -80 °C. A total of 18 Leptospira serovars cultured in Medium A was aliquoted into cryogenic vials and directly stored at -80 °C. A hundred microlitre from each serovar culture stored at -80 °C was sub-cultured on a selected time over a period of 30 months into Media A, B and C. Regrowth on Media B and C showed a better and faster recovery (89-100%) (p-value <0.05) compared to Medium A (67-100%). Leptospires can be stored longer at -80 °C and a good recovery could be obtained when sub-cultured on EMJH medium without 5-fluorouracil.

Matched MeSH terms: Culture Media
Fulltext A refined medium to enhance the antimicrobial activity of postbiotic produced by Lactiplantibacillus plantarum RS5

Ooi MF, Foo HL, Loh TC, Mohamad R, Rahim RA, Ariff A

Sci Rep, 2021 Apr 07;11(1):7617.
PMID: 33828119 DOI: 10.1038/s41598-021-87081-6

Postbiotic RS5, produced by Lactiplantibacillus plantarum RS5, has been identified as a promising alternative feed supplement for various livestock. This study aimed to lower the production cost by enhancing the antimicrobial activity of the postbiotic RS5 by improving the culture density of L. plantarum RS5 and reducing the cost of growth medium. A combination of conventional and statistical-based approaches (Fractional Factorial Design and Central Composite Design of Response Surface Methodology) was employed to develop a refined medium for the enhancement of the antimicrobial activity of postbiotic RS5. A refined medium containing 20 g/L of glucose, 27.84 g/L of yeast extract, 5.75 g/L of sodium acetate, 1.12 g/L of Tween 80 and 0.05 g/L of manganese sulphate enhanced the antimicrobial activity of postbiotic RS5 by 108%. The cost of the production medium was reduced by 85% as compared to the commercially available de Man, Rogosa and Sharpe medium that is typically used for Lactobacillus cultivation. Hence, the refined medium has made the postbiotic RS5 more feasible and cost-effective to be adopted as a feed supplement for various livestock industries.

Matched MeSH terms: Culture Media/analysis; Culture Media/chemical synthesis; Culture Media/chemistry*
Modeling the significance of green orientation and culture on green innovation performance: moderating effect of firm size and green implementation

Bhatti SM, Al Mamun A, Wu M, Naznen F, Kanwal S, Makhbul ZKM

Environ Sci Pollut Res Int, 2023 Sep;30(44):99855-99874.
PMID: 37615918 DOI: 10.1007/s11356-023-29353-4

The current global trend in sustainable business practices is to optimize green innovation performance. To protect the environment and maintain their own survival, organizations must strengthen their green innovation capabilities. Drawing on the recourse-based view and ecology modernization theory (EMT), this study examines the direct effect of green strategic orientations, green entrepreneurial orientation, green market orientation, green innovation orientation, and green organizational culture on the firm's green innovation capability, as well as the mediating effect of green innovation capability on the relationship of these four factors and green innovation performance. Besides, this study also explored the moderating effects of green management system implementation and firm size on the association between green innovation capability and green innovation performance. To test the hypothesized model, a questionnaire survey was administered to gather responses from 293 medium-sized and large manufacturing firms operating in Pakistan. The partial least squares method was used for data analysis. The results revealed that green entrepreneurial orientation, green market orientation, green innovation orientation, and green organizational culture positively impacted green innovation capability, which subsequently positively influenced green innovation performance. Moreover, effective implementation of green management systems can bolster the effect of green innovation capability on green innovation performance, and the mediating effect of green innovation capability has also been confirmed. These indicated that the management of medium and large manufacturing firms operating in Pakistan should focus on encouraging green innovation and training employees regarding the latest eco-friendly technologies to attain performance and sustainable development goals. Policymakers should implement green business development programs and offer rewards or penalties for promoting compliance. The present study contributes greatly to the literature by applying EMT as an alternative to address the mediating role of green innovation capability and the moderating effect of green management system implementation in enhancing firms' green innovation performance.

Matched MeSH terms: Organizational Culture
Performance of Malaysian kenaf Hibiscus cannabinus callus biomass and exopolysaccharide production in a novel liquid culture

'Aizat Norhisham D, Md Saad N, Ahmad Usuldin SR, Vayabari DAG, Ilham Z, Ibrahim MF, et al.

Bioengineered, 2023 Dec;14(1):2262203.
PMID: 37791464 DOI: 10.1080/21655979.2023.2262203

The versatility of a well-known fibrous crop, Hibiscus cannabinus (kenaf) is still relatively new to many. Kenaf's potential applications, which can be extended even into critical industries such as pharmaceutical and food industries, have always been overshadowed by its traditionally grown fiber. Therefore, this study aimed to venture into the biotechnological approach in reaping the benefits of kenaf through plant cell suspension culture to maximize the production of kenaf callus biomass (KCB) and exopolysaccharide (EPS), which is deemed to be more sustainable. A growth curve was established which indicates that cultivating kenaf callus in suspension culture for 22 days gives the highest KCB (9.09 ± 1.2 g/L) and EPS (1.1 ± 0.02 g/L). Using response surface methodology (RSM), it was found that sucrose concentration, agitation speed, and naphthalene acetic acid (NAA) concentration can affect the production of KCB and EPS significantly (p

Matched MeSH terms: Cell Culture Techniques
Fulltext Examining antecedents of organizational citizenship behavior: An empirical study in Indonesian police context

Sridadi AR, Eliyana A, Priyandini FA, Pratama AS, Ajija SR, Mohd Kamil NL

PLoS One, 2023;18(10):e0291815.
PMID: 37797049 DOI: 10.1371/journal.pone.0291815

Police reform in the Mobile Brigade Corps unit in Indonesia, which seeks to break away from militaristic elements, has not been fully implemented optimally. This is reflected in the lack of implementation of human values in serving the community. The extra effort of officers in encouraging community service based on human values can be realized through Organizational Citizenship Behavior which is not only directed at fellow officers, but also towards organizations in the context of community service. Based on Social Exchange Theory, this study aims to investigate the mechanism of strengthening Organizational Citizenship Behavior in the context of the Police Mobile Brigade Corps with the support of Empowering Leadership, Psychological Empowerment, and Job Satisfaction. Using a quantitative approach, this study distributed online questionnaires to 395 Mobile Brigade Corps officers. Furthermore, this study analyzes the data using Partial Least Squares-Structural Equation Modeling. The test results show that Empowering Leadership can strengthen Organizational Citizenship Behavior. In addition, this study reveals the mediating role of Psychological Empowerment and Job Satisfaction in the influence of Empowering Leadership on Organizational Citizenship Behavior. With these findings, the Police Mobile Brigade Corps needs to improve the competence of officers through training and development efforts so that officers feel psychologically empowered and have job satisfaction. On the other hand, Mobile Brigade Corps needs to encourage leaders to provide opportunities for officers to participate in decision making and recognize their contributions to work.

Matched MeSH terms: Organizational Culture
Effect of supplementation of dermal fibroblasts conditioned medium on expansion of keratinocytes through enhancing attachment

Chowdhury SR, Aminuddin BS, Ruszymah BH

Indian J Exp Biol, 2012 May;50(5):332-9.
PMID: 22803323

In the present study in vitro expansion of human keratinocytes by supplementing dermal fibroblasts conditioned medium (DFCM) has been reported. Effect of two different DFCM acquired by culturing fibroblasts in keratinocyte-specific medium (defined keratinocytes serum free medium, DFCM-DKSFM) and fibroblast-specific serum free medium (F12: DMEM nutrient mix, DFCM-FD) have been compared. Growth kinetics of keratinocytes in terms of efficiency of cell attachment, expansion index, apparent specific growth rate and growth potential at the end of culture was evaluated in culture supplemented with DFCM-DKSFM and DFCM-FD in comparison with control i.e. DKSFM only. Results indicated that supplementation of DFCM caused significant increase in keratinocyte attachment. Efficiency of keratinocyte attachment in culture supplemented with bFCM-DKSFM was significantly higher compared to those cultured in DFCM-FD and DKSFM. In addition, the expansion index of keratinocytes in cultures supplemented with DFCM-DKSFM and DFCM-FD were 3.7 and 2.2 times higher than that of control condition even though the apparent growth rate and proliferative potential was found significantly lower. These results suggested that supplementation of DFCM enhanced expansion of keratinocyte by increasing efficiency of cell attachment, and DFCM-DKSFM provided suitable condition for in vitro expansion of keratinocytes compared to DFCM-FD and control condition.

Matched MeSH terms: Culture Media, Serum-Free; Culture Media, Conditioned/pharmacology*; Cell Culture Techniques
Stem cell-derived conditioned medium for alopecia: A systematic review and meta-analysis

Chien WY, Huang HM, Kang YN, Chen KH, Chen C

J Plast Reconstr Aesthet Surg, 2024 Jan;88:182-192.
PMID: 37983981 DOI: 10.1016/j.bjps.2023.10.060

BACKGROUND: Alopecia is a common and distressing medical condition that has been related to psychiatric disorders. Stem cell-derived conditioned medium (CM), a novel therapy for hair regeneration, has shown effectiveness in several trials.
METHODS: This meta-analysis aims to explore the effectiveness of stem cell-derived CM in improving hair growth for patients of alopecia. We prospectively registered this systematic review and meta-analysis in PROSPERO (CRD42023410249). Clinical trials that the enrolled participants suffering from alopecia applied stem cell-derived CM were included. We calculated the mean and standard deviation for the hair density and thickness.
RESULTS: Ten clinical trials were included in our analysis. On the basis of eight clinical trials (n = 221), our pooled results indicate that stem cell-derived CM is effective in increasing hair density (mean difference [MD]: 14.93, confidence interval [95% CI]: 10.20-19.67, p

Matched MeSH terms: Culture Media, Conditioned
The differential effects of commercial specialized media on cell growth and transforming growth factor beta 1-induced epithelial-mesenchymal transition in bronchial epithelial cells

Hasan NAHM, Harith HH, Israf DA, Tham CL

Mol Biol Rep, 2020 May;47(5):3511-3519.
PMID: 32279207 DOI: 10.1007/s11033-020-05439-x

Epithelial-mesenchymal transition (EMT) is one of the mechanisms that contribute to bronchial remodelling which underlie chronic inflammatory airway diseases such as chronic obstructive pulmonary disorder (COPD) and asthma. Bronchial EMT can be triggered by many factors including transforming growth factor β1 (TGFβ1). The majority of studies on TGFβ1-mediated bronchial EMT used BEGM as the culture medium. LHC-9 medium is another alternative available which is more economical but a less common option. Using normal human bronchial epithelial cells (BEAS-2B) cultured in BEGM as a reference, this study aims to validate the induction of EMT by TGFβ1 in cells cultured in LHC-9. Briefly, the cells were maintained in either LHC-9 or BEGM, and induced with TGFβ1 (5, 10 and 20 ng/ml) for 48 h. EMT induction was confirmed by morphological analysis and EMT markers expression by immunoblotting. In both media, cells induced with TGFβ1 displayed spindle-like morphology with a significantly higher radius ratio compared to non-induced cells which displayed a cobblestone morphology. Correspondingly, the expression of the epithelial marker E-cadherin was significantly lower, whereas the mesenchymal marker vimentin expression was significantly higher in induced cells, compared to non-induced cells. By contrast, a slower cell growth rate was observed in LHC-9 compared to that of BEGM. This study demonstrates that neither LHC-9 nor BEGM significantly influence TGFβ1-induced bronchial EMT. However, LHC-9 is less optimal for bronchial epithelial cell growth compared to BEGM. Thus, LHC-9 may be a more cost-effective substitute for BEGM, provided that time is not a factor.

Matched MeSH terms: Culture Media/metabolism; Culture Media/pharmacology*; Culture Media/chemistry; Culture Media, Conditioned/metabolism; Culture Media, Conditioned/pharmacology*; Culture Media, Conditioned/chemistry; Cell Culture Techniques/methods
Human platelet lysate permits scale-up of dental pulp stromal cells for clinical applications

Govindasamy V, Ronald VS, Abdullah AN, Ganesan Nathan KR, Aziz ZA, Abdullah M, et al.

Cytotherapy, 2011 Nov;13(10):1221-33.
PMID: 21929379 DOI: 10.3109/14653249.2011.602337

BACKGROUND AIMS. Dental pulp stromal cells (DPSC) are considered to be a promising source of stem cells in the field of regenerative therapy. However, the usage of DPSC in transplantation requires large-scale expansion to cater for the need for clinical quantity without compromising current good manufacturing practice (cGMP). Existing protocols for cell culturing make use of fetal bovine serum (FBS) as a nutritional supplement. Unfortunately, FBS is an undesirable additive to cells because it carries the risk of transmitting viral and prion diseases. Therefore, the present study was undertaken to examine the efficacy of human platelet lysate (HPL) as a substitute for FBS in a large-scale set-up. METHODS. We expanded the DPSC in Dulbecco's modified Eagle's medium-knock-out (DMEM-KO) with either 10% FBS or 10% HPL, and studied the characteristics of DPSC at pre- (T25 culture flask) and post- (5-STACK chamber) large-scale expansion in terms of their identity, quality, functionality, molecular signatures and cytogenetic stability. RESULTS. In both pre- and post-large-scale expansion, DPSC expanded in HPL showed extensive proliferation of cells (c. 2-fold) compared with FBS; the purity, immune phenotype, colony-forming unit potential and differentiation were comparable. Furthermore, to understand the gene expression profiling, the transcriptomes and cytogenetics of DPSC expanded under HPL and FBS were compared, revealing similar expression profiles. CONCLUSIONS. We present a highly economized expansion of DPSC in HPL, yielding double the amount of cells while retaining their basic characteristics during a shorter time period under cGMP conditions, making it suitable for therapeutic applications.

Matched MeSH terms: Culture Media/metabolism; Culture Media/pharmacology*; Culture Media, Serum-Free/pharmacology*; Culture Media, Serum-Free/chemistry
Increasing glucose in KSOMaa basal medium on culture Day 2 improves in vitro development of cloned caprine blastocysts produced via intraspecies and interspecies somatic cell nuclear transfer

Kwong PJ, Abdullah RB, Wan Khadijah WE

Theriogenology, 2012 Sep 1;78(4):921-9.
PMID: 22704387 DOI: 10.1016/j.theriogenology.2012.04.009

This study was conducted to evaluate the efficiency of potassium simplex optimization medium with amino acids (KSOMaa) as a basal culture medium for caprine intraspecies somatic cell nuclear transfer (SCNT) and caprine-bovine interspecies somatic cell nuclear transfer (iSCNT) embryos. The effect of increased glucose as an energy substrate for late stage development of cloned caprine embryos in vitro was also evaluated. Enucleated caprine and bovine in vitro matured oocytes at metaphase II were reconstructed with caprine ear skin fibroblast cells for the SCNT and iSCNT studies. The cloned caprine and parthenogenetic embryos were cultured in either KSOMaa with 0.2 mM glucose for 8 days (Treatment 1) or KSOMaa for 2 days followed by KSOMaa with additional glucose at a final concentration of 2.78 mM for the last 6 days (Treatment 2). There were no significant differences in the cleavage rates of SCNT (80.7%) and iSCNT (78.0%) embryos cultured in KSOMaa medium. Both Treatment 1 and Treatment 2 could support in vitro development of SCNT and iSCNT embryos to the blastocyst stage. However, the blastocyst development rate of SCNT embryos was significantly higher (P < 0.05) in Treatment 2 compared to Treatment 1. Increasing glucose for later stage embryo development (8-cell stage onwards) during in vitro culture (IVC) in Treatment 2 also improved both caprine SCNT and iSCNT embryo development to the hatched blastocyst stage. In conclusion, this study shows that cloned caprine embryos derived from SCNT and iSCNT could develop to the blastocyst stage in KSOMaa medium supplemented with additional glucose (2.78 mM, final concentration) and this medium also supported hatching of caprine cloned blastocysts.

Matched MeSH terms: Culture Media/pharmacology*; Culture Media/chemistry; Embryo Culture Techniques/methods*; Embryo Culture Techniques/veterinary
Fulltext Response surface optimization of culture medium for enhanced docosahexaenoic acid production by a Malaysian thraustochytrid

Manikan V, Kalil MS, Hamid AA

Sci Rep, 2015;5:8611.
PMID: 25721623 DOI: 10.1038/srep08611

Docosahexaenoic acid (DHA, C22:6n-3) plays a vital role in the enhancement of human health, particularly for cognitive, neurological, and visual functions. Marine microalgae, such as members of the genus Aurantiochytrium, are rich in DHA and represent a promising source of omega-3 fatty acids. In this study, levels of glucose, yeast extract, sodium glutamate and sea salt were optimized for enhanced lipid and DHA production by a Malaysian isolate of thraustochytrid, Aurantiochytrium sp. SW1, using response surface methodology (RSM). The optimized medium contained 60 g/L glucose, 2 g/L yeast extract, 24 g/L sodium glutamate and 6 g/L sea salt. This combination produced 17.8 g/L biomass containing 53.9% lipid (9.6 g/L) which contained 44.07% DHA (4.23 g/L). The optimized medium was used in a scale-up run, where a 5 L bench-top bioreactor was employed to verify the applicability of the medium at larger scale. This produced 24.46 g/L biomass containing 38.43% lipid (9.4 g/L), of which 47.87% was DHA (4.5 g/L). The total amount of DHA produced was 25% higher than that produced in the original medium prior to optimization. This result suggests that Aurantiochytrium sp. SW1 could be developed for industrial application as a commercial DHA-producing microorganism.

Matched MeSH terms: Culture Media/chemistry*
Evaluation of royal jelly as an alternative to fetal bovine serum in cell culture using cell proliferation assays and live cell imaging

Musa M, Nasir NF, Thirumulu KP

Afr J Tradit Complement Altern Med, 2014;11(1):148-55.
PMID: 24653569

Royal jelly is a nutritious substance produced by the young nurse bees and contains significant amounts of proteins which are important for cell growth and proliferation. The aim of this study was to evaluate the effect of royal jelly as an alternative to fetal bovine serum (FBS) in cell culture using cell proliferation assays and live cell imaging.

Matched MeSH terms: Culture Media/chemistry*
Investigation of the gibberellic acid optimization with a statistical tool from Penicillium variable in batch reactor

Isa NK, Mat Don M

Prep Biochem Biotechnol, 2014;44(6):572-85.
PMID: 24499362 DOI: 10.1080/10826068.2013.844707

The culture conditions for gibberellic acid (GA3) production by the fungus Penicillium variable (P. variable) was optimized using a statistical tool, response surface methodology (RSM). Interactions of culture conditions and optimization of the system were studied using Box-Behnken design (BBD) with three levels of three variables in a batch flask reactor. Experimentation showed that the model developed based on RSM and BBD had predicted GA3 production with R(2) = 0.987. The predicted GA3 production was optimum (31.57 mg GA3/kg substrate) when the culture conditions were at 7 days of incubation period, 21% v/w of inoculum size, and 2% v/w of olive oil concentration as a natural precursor. The results indicated that RSM and BBD methods were effective for optimizing the culture conditions of GA3 production by P. variable mycelia.

Matched MeSH terms: Culture Media/chemistry*
Effect of culture media on expansion properties of human umbilical cord matrix-derived mesenchymal cells

Salehinejad P, Alitheen NB, Nematollahi-Mahani SN, Ali AM, Omar AR, Janzamin E, et al.

Cytotherapy, 2012 Sep;14(8):948-53.
PMID: 22587592 DOI: 10.3109/14653249.2012.684377

BACKGROUND AIMS: Mesenchymal stromal cells (MSC) have been isolated from a number of different tissues, including umbilical cord. Because of the lack of a uniform approach to human umbilical cord matrix-derived mesenchymal (hUCM) cell expansion, we attempted to identify the optimum conditions for the production of a high quantity of hUCM cells by comparing two media.
METHODS: We compared the ability of Dulbecco's Modified Eagle's Medium/F12 (DMEM/F12) and Alpha Minimum Essential Medium (α-MEM) with Glutamax (GL) (α-MEM/GL) to expand hUCM cells. For this purpose, hUCM cells were cultured in plates containing different culture media supplemented with 10% fetal bovine serum (FBS). Culture dishes were left undisturbed for 10-14 days to allow propagation of the newly formed hUCM cells. The expansion properties, CD marker expression, differentiation potential, population doubling time (PDT) and cell activity were compared between the two groups.
RESULTS: The hUCM cells harvested from each group were positive for MSC markers, including CD44, CD90 and CD105, while they were negative for the hematopoietic cell surface marker CD34. Differentiation into adipogenic and osteogenic lineages was confirmed for both treatments. Cell activity was higher in the α-MEM/GL group than the DMEM/F12 group. PDT was calculated to be 60 h for the DMEM/F12 group, while for the α-MEM/GL group it was 47 h.
CONCLUSIONS: Our data reveal that α-MEM/GL with 10% FBS supports hUCM cell growth more strongly than DMEM/F12 with 10% FBS.

Matched MeSH terms: Cell Culture Techniques*
In vitro binding of mutagenic heterocyclic aromatic amines by Bifidobacterium pseudocatenulatum G4

Faridnia F, Hussin AS, Saari N, Mustafa S, Yee LY, Manap MY

Benef Microbes, 2010 Jun;1(2):149-54.
PMID: 21831754 DOI: 10.3920/BM2009.0035

Consumption of probiotics has been associated with decreased risk of colon cancer and reported to have antimutagenic/ anti-carcinogenic properties. One possible mechanism for this effect involves physical binding of the mutagenic compounds, such as heterocyclic amines (HCAs), to the bacteria. Therefore, the objective of this study was to examine the binding capacity of bifidobacterial strains of human origin on mutagenic heterocyclic amines which are suspected to play a role in human cancers. In vitro binding of the mutagens Trp-p-2, IQ, MeIQx, 7,8DiMeIQx and PhIP by three bacterial strains in two media of different pH was analysed using high performance liquid chromatography. Bifidobacterium pseudocatenulatum G4 showed the highest decrease in the total HCAs content, followed by Bifidobacterium longum, and Escherichia coli. pH affects binding capacity; the highest binding was obtained at pH 6.8. Gram-positive tested strains were found to be consistently more effective than the gram-negative strain. There were significant decreases in the amount of HCAs in the presence of different cell concentrations of B. pseudocatenulatum G4; the highest decrease was detected at the concentration of 10(10) cfu/ml. The results showed that HCAs were able to bind with all bacterial strains tested in vitro, thus it may be possible to decrease their absorption by human intestine and increase their elimination via faeces.

Matched MeSH terms: Culture Media/chemistry
Patrescence in Southern Thailand: cosmological and social dimensions of fatherhood among the Malay-Muslims

Merli C

Cult Health Sex, 2011 Dec;13 Suppl 2:S235-48.
PMID: 21409659 DOI: 10.1080/13691058.2011.558592

This paper examines fatherhood among the Malay Muslims of Southern Thailand (representing a minority at the national level, but constituting the majority population in the region). Traditional practices related to birth and the postpartum period are upheld as a marker of ethnic and religious identity by such groups. Building on the concept of patrescence as 'becoming a father', proposed by Dana Raphael, the data presented show how the process of assuming fatherhood develops during pregnancy and continues after birth through a series of ritual practices in which a man contributes to female postpartum practices. The medicalisation of birth in synergy with recent literalist interpretations of Islam has impacted on these practices, making it difficult to comply with the ritual burial of the afterbirth, which constitutes the cosmological and physical anchoring of individual and ethnic identity to the soil.

Matched MeSH terms: Culture*
An improved selective and differential medium for the isolation of Burkholderia pseudomallei from clinical specimens

Francis A, Aiyar S, Yean CY, Naing L, Ravichandran M

Diagn Microbiol Infect Dis, 2006 Jun;55(2):95-9.
PMID: 16626918

Isolation and culture of Burkholderia pseudomallei remains the main stay in the diagnosis of melioidosis. Thus, the search for selective and differential media for B. pseudomallei has been ongoing. A number of such media have been reported with varying efficacy. Ashdown medium is the most established selective medium for the isolation of B. pseudomallei. There are no reports of differential media differentiating B. pseudomallei from Burkholderia cepacia. This report documents such a selective and differentiating medium for B. pseudomallei. Of a total of 1042 clinical specimens containing mixed flora and gram-negative isolates that were tested on this medium, 16 of the specimens yielded B. pseudomallei. The isolation rate was found to be 1.5%. This medium was found to be simple and inexpensive, can be made by small laboratories, and called as Francis medium. Based on the colony morphology and color, a preliminary report can be made within 18-24 h for the presence of B. pseudomallei. Our study showed that this medium had an overall sensitivity of 78.4% with a specificity of 92.2%. The use of this medium as an early diagnostic tool will help to reduce mortality and morbidity of melioidosis patients.

Matched MeSH terms: Culture Media/chemistry*
Improved production of live cells of Lactobacillus rhamnosus by continuous cultivation using glucose-yeast extract medium

Ling LS, Mohamad R, Rahim RA, Wan HY, Ariff AB

J Microbiol, 2006 Aug;44(4):439-46.
PMID: 16953180

In this study, the growth kinetics of Lactobacillus rhamnosus and lactic acid production in continuous culture were assessed at a range of dilution rates (0.05 h(-1) to 0.40 h(-1)) using a 2 L stirred tank fermenter with a working volume of 600 ml. Unstructured models, predicated on the Monod and Luedeking-Piret equations, were employed to simulate the growth of the bacterium, glucose consumption, and lactic acid production at different dilution rates in continuous cultures. The maximum specific growth rate of L. rhamnosus, mu-max, was estimated at 0.40 h(-1), and the Monod cell growth saturation constant, Ks, at approximately 0.25 g/L. Maximum cell viability (1.3 x 10(10) CFU/ml) was achieved in the dilution rate range of D = 0.28 h(-1) to 0.35 h(-1). Both maximum viable cell yield and productivity were achieved at D = 0.35 h(-1). The continuous cultivation of L. rhamnosus at D = 0.35 h(-1) resulted in substantial improvements in cell productivity, of 267% (viable cell count) that achieved via batch cultivation.

Matched MeSH terms: Culture Media*

Filters

Please provide feedback to Administrator ([email protected])

External Links