1.Surgical treatment of the avulsion of posterior cruciated ligament
Journal of Vietnamese Medicine 2001;261(7):23-25
248 cases of avulsion of posterior cruciate ligament treated with screw fixation.- The Trickey approach through the poplitear fossa to treat the avulsion of PCL is difficult and hazardous. - From 1991-1999 at CTO, 248 cases of avulsion of PCL were treated (169 men-79 women, age 13-60, traffic accident: 229 cases). In 232 cases, we used a simplified approach which was not transcrect the gastrocnemius or expose the neurovascular structures but only retracted the medical head of gastrocnemiers to expose the posterior capsule of the knee. This technique is very easy, safe and good rehabilitation
Posterior Cruciate Ligament
;
Surgery
2.Optimization of Solid-State Fermentation for Improved Conidia Production of Beauveria bassiana as a Mycoinsecticide.
Tuan Anh PHAM ; Jeong Jun KIM ; Keun KIM
Mycobiology 2010;38(2):137-143
The production of conidia of entomopathogenic Beauveria bassiana by solid-state fermentation was studied for the development of a biocontrol agent against aphid Myzus persicae. The optimal conditions for conidia production on polished white rice were 40% moisture content, 25degrees C culture temperature, 2-day-old seeding culture grown in 3% corn meal, 2% rice bran, 2% corn steep powder medium, initial conidia concentration of 107 conidia/g in the wet rice, 10% inoculum size, and use of a polyethylene bag as a container. The polyethylene bag containing inoculated rice was hand-shaken every 12 hr during fermentation. Using optimal conditions, the maximum conidia production obtained was 4.05 g conidia/100 g dry rice after 14 days of cultivation, a rate 2.83 times higher than conidia yield of pre-optimization.
Aphids
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Beauveria
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Fermentation
;
Humans
;
Meals
;
Polyethylene
;
Seeds
;
Spores, Fungal
;
Zea mays
3.Improvement of Fungal Cellulase Production by Mutation and Optimization of Solid State Fermentation.
Van Hanh VU ; Tuan Anh PHAM ; Keun KIM
Mycobiology 2011;39(1):20-25
Spores of Aspergillus sp. SU14 were treated repeatedly and sequentially with Co60 gamma-rays, ultraviolet irradiation, and N-methyl-N'-nitro-N-nitrosoguanidine. One selected mutant strain, Aspergillus sp. SU14-M15, produced cellulase in a yield 2.2-fold exceeding that of the wild type. Optimal conditions for the production of cellulase by the mutant fungal strain using solid-state fermentation were examined. The medium consisted of wheat-bran supplemented with 1% (w/w) urea or NH4Cl, 1% (w/w) rice starch, 2.5 mM MgCl2, and 0.05% (v/w) Tween 80. Optimal moisture content and initial pH was 50% (v/w) and 3.5, respectively, and optimal aeration area was 3/100 (inoculated wheat bran/container). The medium was inoculated with 25% 48 hr seeding culture and fermented at 35degrees C for 3 days. The resulting cellulase yield was 8.5-fold more than that of the wild type strain grown on the basal wheat bran medium.
Aspergillus
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Cellulase
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Dietary Fiber
;
Fermentation
;
Hydrogen-Ion Concentration
;
Magnesium Chloride
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Methylnitronitrosoguanidine
;
Polysorbates
;
Seeds
;
Spores
;
Sprains and Strains
;
Starch
;
Triticum
;
Urea
4.Fungal Strain Improvement for Cellulase Production Using Repeated and Sequential Mutagenesis.
Van Hanh VU ; Tuan Anh PHAM ; Keun KIM
Mycobiology 2009;37(4):267-271
A fungal strain producing a high level of cellulase was selected from 320 fungal isolates and identified as Aspergillus sp. This strain was further improved for cellulase production by sequential treatments by two repeated rounds of gamma-irradiation of Co60, ultraviolet treatment and four repeated rounds of treatment with N-methyl-N'-nitro-N-nitrosoguanidine. The best mutant strain, Aspergillus sp. XTG-4, was selected after screening and the activities of carboxymethyl cellulase, filter paper cellulase and beta-glucosidase of the cellulase were improved by 2.03-, 3.20-, and 1.80-fold, respectively, when compared to the wild type strain. After being subcultured 19 times, the enzyme production of the mutant Aspergillus sp. XTG-4s was stable.
Aspergillus
;
beta-Glucosidase
;
Cellulase
;
Mass Screening
;
Methylnitronitrosoguanidine
;
Mutagenesis
;
Sprains and Strains
5.Production of Blastospore of Entomopathogenic Beauveria bassiana in a Submerged Batch Culture.
Tuan Anh PHAM ; Jeong Jun KIM ; Seon Gon KIM ; Keun KIM
Mycobiology 2009;37(3):218-224
The principal objective of this study was to determine the optimal liquid culture conditions in shake flasks for maximal sporulation of Beauveria bassiana. The optimal initial pH for the spore production of B. bassiana using Potato Dextrose Broth was 5.2. The screening in shake flasks of carbon and nitrogen sources resulted in the identification of an optimal medium based on 3% sucrose and 1% casamino acid, with a C : N ratio of 22 : 4. Using this medium, a production level of 5.65 x 107 spores per ml was obtained after 5 days of culture. Using 3% corn meal, 2% corn steep powder, and 2% rice bran, the maximum spore concentration of 8.54 x 108/ml was achieved 8 days after inoculation at 25degrees C in a rotary shaking incubator operated at 200 rpm. This represents a yield gain of approximately 2.89 times that of pre-optimization.
Batch Cell Culture Techniques
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Beauveria
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Carbon
;
Glucose
;
Hydrogen-Ion Concentration
;
Incubators
;
Mass Screening
;
Meals
;
Nitrogen
;
Solanum tuberosum
;
Spores
;
Sucrose
;
Zea mays
6.Removal of Manganese and Copper from Aqueous Solution by Yeast Papiliotrema huenov
Phu Nguyen VAN ; Hai Thi Hong TRUONG ; Tuan Anh PHAM ; Tuan Le CONG ; Tien LE ; Kim Cuc Thi NGUYEN
Mycobiology 2021;49(5):507-520
Papiliotrema huenov was previously reported to be highly tolerant of a range of extremely toxic heavy metals. This study aimed to identify the potential of P. huenov to remove manganese and copper from aqueous solution. Physical conditions which affect removal of Mn(II) and Cu(II) were determined. Optimal temperature for adsorption of both metal ions was 30°C, and optimal pH for maximum uptake of Mn(II) and Cu(II) were 5 and 6, respectively. Under these conditions, living cells of P. huenov accumulated up to 75.58% of 110 mg/ L Mn(II) and 70.5% of 128 mg/L Cu(II) over 120 h, whereas, the removal efficiency of metal ions by dead cells over 1 h was 60.3% and 56.5%, respectively. These results indicate that living cells are more effective than dead biomass for bioremediation, but that greater time is required. The experimental data extends the potential use of P. huenov in biosorption and bioaccumulation of toxic heavy metals to copper and manganese, two of the most common industrial contaminants.
7.Study on the production of measles antibody used for vaccine quality control
Thu Nu Anh Nguyen ; Huong Thu Ngo ; Thu Anh Pham ; Dung Trung Le ; Nga Thi Nguyen ; Hien Dang Nguyen ; Luan Thi Le ; Thanh Kim Dang ; Thanh Kim Dang ; Thanh Kim Dang ; Thanh Kim Dang ; Thai Minh Ngo ; Thai Minh Ngo ; Thai Minh Ngo ; Thai Minh Ngo
Journal of Preventive Medicine 2008;18(6):74-78
Background: With the help of Japan, the Center for Research and Production of vaccines and biologicals, Hanoi has received a WHO standard measles vaccine production technology, including techniques in the examination of vaccine quality. Therefore, it is needed to be initiative on production of measles antibody. Objective: Study on production of measles antibody in rabbits and selecting the appropriate antibody for production of high titre antibody, which meets the standard of vaccine quality control in Vietnam. Subject and methods: Using the measles antigen from Edmonston and AIK-C strains, which were provided by the Kitasato Institute, to produce measles antibody. Making immunoreaction in rabbits and determination of neutralization antibody titre. Results and Conclusion: Measles antigen of Edmonston Vero 7/P2 strain used in the production of measles antibody in rabbit created the highest antibody titre in comparison with AIK-C strain from vero cell and FL cell supplied by the Kitasato Institute of Japan. Antibody titre of Edmonston Vero 7/P2 strain reached up to 1/8192 and met the sera standard required for measles vaccine quality control, it is similar to the measles sera to be produced from the Kitasato Institute.
measles antibody
;
antibody titre
8.Enhancement of antitumor effect using dendritic cells activated with natural killer cells in the presence of Toll-like receptor agonist.
Thanh Nhan Nguyen PHAM ; Cheol Yi HONG ; Jung Joon MIN ; Joon Haeng RHEE ; Truc Anh Thi NGUYEN ; Byoung Chul PARK ; Deok Hwan YANG ; Young Kyu PARK ; Hyeong Rok KIM ; Ik Joo CHUNG ; Hyeoung Joon KIM ; Je Jung LEE
Experimental & Molecular Medicine 2010;42(6):407-419
Dendritic cells (DCs) play a role in natural killer (NK) cell activation, while NK cells are also able to activate and mature DCs. Toll-like receptors (TLRs) on the surface of DCs and NK cells induce the maturation and activation of these cells when engaged with their cognate ligand. We investigated to generate potent DCs by maturation with NK cells in the presence of TLR agonist in vitro and tested the efficacy of these DC vaccinations in mouse colon cancer model. The optimal ratios of DCs versus NK cells were 1:1 to 1:2. Immature DCs were mature with NK cells in the presence of lipopolysaccharide, which is TLR4 agonist, and further addition of IL-2 induced phenotypically and functionally mature bone marrow-derived DCs. These potent DCs exhibited not only high expression of several costimulatory molecules and high production of IL-12p40 and IL-12p70, but also high allogeneic T cells stimulatory capacity, and the induction of the high activities to generate tumor-specific CTLs. Consistently, vaccination with these DCs efficiently inhibited CT-26 tumor growth in mouse colon cancer model when compared to other vaccination strategies. Interestingly, combination therapy of these DC-based vaccines and with low-dose cyclophosphamide showed dramatic inhibition effects of tumor growth. These results suggest that the DCs maturated with NK cells in the presence of TLR agonist are potent inducer of antitumor immune responses in mouse model and may provide a new source of DC-based vaccines for the development of immunotherapy against colon cancer.
Animals
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Cancer Vaccines/immunology/metabolism
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Carcinoma/immunology/pathology/*therapy
;
Cell Line, Tumor
;
Cells, Cultured
;
Colonic Neoplasms/immunology/pathology/*therapy
;
Dendritic Cells/*drug effects/*immunology/transplantation
;
Female
;
Immunotherapy, Adoptive/*methods
;
Killer Cells, Natural/*immunology/physiology
;
Lipopolysaccharides/pharmacology
;
Mice
;
Mice, Inbred BALB C
;
Toll-Like Receptor 4/agonists
;
Toll-Like Receptors/*agonists
9.Alpha-Type 1 Polarized Dendritic Cells Loaded with Apoptotic Allogeneic Breast Cancer Cells Can Induce Potent Cytotoxic T Lymphocytes against Breast Cancer.
Min Ho PARK ; Deok Hwan YANG ; Mi Hyun KIM ; Jae Hong JANG ; Yoon Young JANG ; Youn Kyung LEE ; Chun Ji JIN ; Than Nhan Nguyen PHAM ; Truc Anh Nguyen THI ; Mi Seon LIM ; Hyun Ju LEE ; Cheol Yi HONG ; Jung Han YOON ; Je Jung LEE
Cancer Research and Treatment 2011;43(1):56-66
PURPOSE: Various tumor antigens can be loaded onto dendritic cells (DCs) to induce a potent cytotoxic T lymphocyte (CTL) response in DC-based immunotherapy against breast cancer. However, in the clinical setting, obtaining a sufficient number of autologous tumor cells as a source of tumor antigens is a laborious process. We therefore investigated the feasibility of immunotherapy using breast-cancer-specific CTLs generated in vitro by use of alpha-type 1 polarized DCs (alpha DC1s) loaded with ultraviolet B-irradiated cells of the breast cancer cell line MCF-7. MATERIALS AND METHODS: alphaDC1s were induced by loading allogeneic tumor antigen generated from the MCF-7 UVB-irradiated breast cancer cell line. Antigen-pulsed alphaDC1s were evaluated by morphological and functional assays, and the breast-cancer-specific CTL response was analyzed by cytotoxic assay. RESULTS: The alphaDC1s significantly increased the expression of several molecules related to DC maturation without differences according to whether the alphaDC1s were loaded with tumor antigens. The alphaDC1s showed a high production of interleukin-12 both during maturation and after subsequent stimulation with CD40L, which was not significantly affected by loading with tumor antigens. Breast-cancer-specific CTLs against autologous breast cancer cells were successfully induced by alphaDC1s loaded with apoptotic MCF-7 cells. CONCLUSION: Autologous DCs loaded with an allogeneic breast cancer cell line can generate potent breast-cancer-specific CTL responses. This may be a practical method for cellular immunotherapy in patients with breast cancer.
Antigens, Neoplasm
;
Breast
;
Breast Neoplasms
;
CD40 Ligand
;
Cell Line
;
Dendritic Cells
;
Humans
;
Immunotherapy
;
Interleukin-12
;
Lymphocytes
;
T-Lymphocytes, Cytotoxic
10.Identification of Soluble Epoxide Hydrolase Inhibitors from the Seeds of Passiflora edulis Cultivated in Vietnam
To Dao CUONG ; Hoang THI NGOC ANH ; Tran Thu HUONG ; Pham Ngoc KHANH ; Vu Thi HA ; Tran Manh HUNG ; Young Ho KIM ; Nguyen Manh CUONG
Natural Product Sciences 2019;25(4):348-353
Soluble epoxide hydrolases (sEH) are enzymes present in all living organisms, metabolize epoxy fatty acids to 1,2-diols. sEH in the metabolism of polyunsaturated fatty acids plays a key role in inflammation. In addition, the endogenous lipid mediators in cardiovascular disease are also broken down to diols by the action of sEH that enhanced cardiovascular protection. In this study, sEH inhibitory guided fractionation led to the isolation of five phenolic compounds trans-resveratrol (1), trans-piceatannol (2), sulfuretin (3), (+)-balanophonin (4), and cassigarol E (5) from the ethanol extract of the seeds of Passiflora edulis Sims cultivated in Vietnam. The chemical structures of isolated compounds were determined by the interpretation of NMR spectral data, mass spectra, and comparison with data from the literature. The soluble epoxide hydrolase (sEH) inhibitory activity of isolated compounds was evaluated. Among them, trans-piceatannol (2) showed the most potent inhibitory activity on sEH with an IC₅₀ value of 3.4 µM. This study marks the first time that sulfuretin (3) was isolated from Passiflora edulis as well as (+)-balanophonin (4), and cassigarol E (5) were isolated from Passiflora genus.
Cardiovascular Diseases
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Epoxide Hydrolases
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Ethanol
;
Fatty Acids
;
Fatty Acids, Unsaturated
;
Inflammation
;
Metabolism
;
Passiflora
;
Passifloraceae
;
Phenol
;
Vietnam