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Truong Giang Nguyen,Thanh Khiem Nguyen,Ham Hoi Nguyen,Hong Son Trinh,Tuan Hiep Luong,Minh Trong Nguyen,Van Duy Le,Hai Dang Do,Kieu Hung Nguyen,Van Minh Do,Quang Huy Tran,Cuong Thinh Nguyen 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1
Backgrounds/Aims: Parenchymal-sparing anatomical hepatectomy (Ps–AH) based on portal ramification of the right anterior section (RAS) is a new technique to avoid unnecessarily transecting too much liver parenchyma, especially in cases of major anatomical hepatectomy. Methods: We prospectively assessed 26 patients with primary hepatic malignancies having undergone major Ps–AH based on portal ramification of the RAS from August 2018 to August 2022 (48 months). The perioperative indications, clinical data, intra-operative index, pathological postoperative specimens, postoperative complications, and follow-up results were retrospectively evaluated. Results: Among the 26 patients analyzed, there was just one case that had intrahepatic cholangiocarcinoma The preoperative level of α– Fetoprotein was 25.2 ng/mL. All cases (100%) had Child–Pugh A liver function preoperatively. The ventral/dorsal RAS was preserved in 19 and 7 patients, respectively. The mean surgical margin was 6.2 mm. The mean surgical time was 228.5 minutes, while the mean blood loss was 255 mL. In pathology, 5 cases (19.2%) had microvascular invasion, and in the group of HCC patients, 92% of all cases had moderate or poor tumor differentiation. Six cases (23.1%) of postoperative complications were graded over III according to the Clavien–Dindo system, including in three patients resistant ascites or intra-abdominal abscess that required intervention. Conclusions: Parenchymal-sparing anatomical hepatectomy based on portal ramification of the RAS to achieve R0-resection was safe and effective, with favorable short-term outcomes. This technique can be used widely in clinical practice.
Presence of β-Amylase in Ramie Leaf and its Anti-staling Effect on Rice Cake
Dang Hai Dang Nguyen,Phuong Lan Tran,하현숙,이진실,홍완수,Quang Tri Le,오병철,박성훈 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1
Presence of β-amylase in ramie leaf and its anti-staling effect on starch-based foods were assessed. The ammonium sulfate fractionate (80% saturation) of the ramie leaf extracts showed a β-amylase activity, giving maltose (Glc2) as a major product, exclusively, when incubating with maltopentaose (Glc5) or soluble starch at 45oC, pH 6.0. The starch-based food product (rice cake) prepared with freeze-dried ramie leaf enzyme revealed that the linear maltooligosaccharides ranging from Glc2 to Glc6 significantly increased and the shorter branch chains (DP<15) of amylopectin increased whereas the longer branch chains (DP>16) decreased in the product. These results demonstrated that maltosyl residue was released from the non-reducing end of the longer branch chains of amylopectin by β-amylase. The ramie leaf-treatment sample significantly reduced the retrogradation rate during 48 h storage at 4℃. As an alternative plant-origin enzyme, the ramie leaf β-amylase has potential for a novel anti-staling additive.
( Dang Hai Dang Nguyen ),( Sung-hoon Park ),( Phuong Lan Tran ),( Jung-wan Kim ),( Quang Tri Le ),( Winfried Boos ),( Jong-tae Park ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.3
We first confirmed the involvement of MalQ (4-α-glucanotransferase) in Escherichia coli glycogen breakdown by both in vitro and in vivo assays. In vivo tests of the knock-out mutant, ΔmalQ, showed that glycogen slowly decreased after the stationary phase compared to the wild-type strain, indicating the involvement of MalQ in glycogen degradation. In vitro assays incubated glycogen-mimic substrate, branched cyclodextrin (maltotetraosyl-β-CD: G4-β-CD) and glycogen phosphorylase (GlgP)-limit dextrin with a set of variable combinations of E. coli enzymes, including GlgX (debranching enzyme), MalP (maltodextrin phosphorylase), GlgP and MalQ. In the absence of GlgP, the reaction of MalP, GlgX and MalQ on substrates produced glucose-1-P (glc-1-P) 3-fold faster than without MalQ. The results revealed that MalQ led to disproportionate G4 released from GlgP-limit dextrin to another acceptor, G4, which is phosphorylated by MalP. In contrast, in the absence of MalP, the reaction of GlgX, GlgP and MalQ resulted in a 1.6-fold increased production of glc-1-P than without MalQ. The result indicated that the G4-branch chains of GlgP-limit dextrin are released by GlgX hydrolysis, and then MalQ transfers the resultant G4 either to another branch chain or another G4 that can immediately be phosphorylated into glc-1-P by GlgP. Thus, we propose a model of two possible MalQ-involved pathways in glycogen degradation. The operon structure of MalP-defecting enterobacteria strongly supports the involvement of MalQ and GlgP as alternative pathways in glycogen degradation.
Crystallization, Magnetic and Magnetoimpedance Properties of a Fe84.5Zr2Nb4B8.5Cu1 NANOPERM Ribbon
Quang Hoa Nguyen,Van Son Dang,유성초,정진수,Chau NGUYEN,이복희 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
An amorphous ribbon of Fe84:5Zr2Nb4B8:5Cu1 has ben prepared by single-rol melt spinning in an Ar atmosphere. The crystalization proces studied by dierential scanning calorimetry (DSC) isinagrementwiththatintheKisingermodelandtheJohnson-Mehl-Avrami(JMA)model. The magnetoimpedance ratio (MIR) of the ribbon has ben measured to investigate the in uence of the structural transformation in the crystalization proces and the changes of the soft magnetic propertiesafterthermaltreatment. Themagnetoimpedance(MI)ofthesesampleshasbenstudied in the frequency range from 1 MHz to 5 MHz by varying a dc magnetic eld within 300 Oe. A maximum MI ratio of up to 85 % has ben observed for ribbons annealed at 530 C for 40 min around a frequency of 1 MHz. The incremental permeability ratio (PR) shows drastic changes in soft magnetic properties as a function of the annealing temperature.
Nguyen Thi Mai Tho,Bui The Huy,Dang Nguyen Nha Khanh,Ho Nguyen Nhat Ha,Vu Quang Huy,Ngo Thi Tuong Vy,Do Manh Huy,Duong Phuoc Dat,Nguyen Thi Kim Phuong 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Novel highly active visible-light photocatalysts in the form of zinc bismuth oxide (ZnBi2O4) and graphite hybrid composites were prepared by coupling via a co-precipitation method followed by calcination at 450 oC. The asprepared ZnBi2O4-graphite hybrid composites were tested for the degradation of rhodamine B (RhB) solutions under visible-light irradiation. The existence of strong electronic coupling between the two components within the ZnBi2O4- graphite heterostructure suppressed the photogenerated recombination of electrons and holes to a remarkable extent. The prepared composite exhibited excellent photocatalytic activity, leading to more than 93% of RhB degradation at an initial concentration of 50mg·L1 with 1.0 g catalyst per liter in 150min. The excellent visible-light photocatalytic mineralization of ZnBi2O4-1.0graphite in comparison with pristine ZnBi2O4 could be attributed to synergetic effects, charge transfer between ZnBi2O4 and graphite, and the separation efficiency of the photogenerated electrons and holes. The photo-induced h+ and the superoxide anion were the major active species responsible for the photodegradation process. The results demonstrate the feasibility of ZnBi2O4-1.0graphite as a potential heterogeneous photocatalyst for environmental remediation.
Nguyen, Quang Dang,Oh, Eun-Suok,Chung, Koo-Hyun Applied Science Publishers 2019 Polymer Testing Vol. No.
<P><B>Abstract</B></P> <P>The nanomechanical properties of various polymer binders for lithium-ion batteries were assessed using colloidal probe atomic force microscopy (AFM) in air and in electrolyte. The reduced elastic moduli determined for polyacrylic acid (PAA), polyacrylonitrile (PAN), polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), and polyvinylidene fluoride (PVDF) were 3.3 ± 1.3, 1.1 ± 0.4, 1.4 ± 0.4, 5.0 ± 2.5, and 1.4 ± 0.6 GPa in air, respectively, and 210 ± 70, 220 ± 130, 410 ± 150, 140 ± 50, and 5.4 ± 2.6 MPa after immersion in electrolyte for 14 h. The results suggest that the effect of friction on force-indentation data should be considered, particularly for measurements in air. It was shown that PAA, PAN, PVA, and CMC are more advantageous than PVDF in terms of mechanical properties. Also, PAA and CMC are preferred due to their enhanced adhesion properties resulting from lower surface roughness and greater work of adhesion. The outcomes provide information to help understand the effects of electrolyte on material properties of polymer binders, which is useful to improve the electrochemical stability of the electrode. Also, the approach used in this work may aid in more accurate measurement of mechanical properties using AFM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of electrolyte on the surface structures of polymer binders for lithium-ion batteries. </LI> <LI> Significant decrease in elastic modulus of polymer binders in electrolyte. </LI> <LI> Determination of the work of adhesion of polymer binders. </LI> <LI> Effect of friction on force-indentation data of polymer binders in air. </LI> <LI> Significant decrease in frictional properties of polymer binders in electrolyte. </LI> </UL> </P>