A 34-residue antimicrobial peptide named dermaseptin was purified to homogeneity from amphibian skin by a 3-step protocol involving molecular sieve filtration, ion-exchange chromatography, and reversed-phase high-performance liquid chromatography. The complete amino acid sequence of dermaseptin, ALWKTMLKKLGTMALHAGKAALGAAADTISQGTQ, was determined by automated Edman degradation of the peptide and of fragments generated by trypsin. Fast atom bombardment mass spectra of dermaseptin gave a protonated molecular ion m/z 3455.4 which matched the theoretical molecular weight predicted from the amino acid sequence. Dermaseptin was synthesized by the solid-phase method. The synthetic replicate was shown to be indistinguishable from natural dermaseptin with respect to chromatographic properties, amino acid sequence determination, and mass spectrometry analysis. Dermaseptin is a water-soluble, thermostable, and nonhemolytic peptide endowed with highly potent antimicrobial activity against pathogenic fungi at micromolar concentration. Circular dichroism spectra of dermaseptin in hydrophobic media indicated 80% alpha-helical conformation, and predictions of secondary structure suggested that dermaseptin can be configured as an amphiphatic alpha-helix spanning over residues 1-27, a structure that perturbs membrane functions regulating water flux.

TÓM TẮT Đặt vấn đề: Nghiên cứu nhằm đánh giá kết quả phẫu thuật nội soi hoàn toàn và phẫu thuật nội soi hỗ trợ cắt toàn bộ dạ dày nạo vét hạch D2 do ung thư tại Bệnh viện Hữu nghị Đa khoa Nghệ An. Phương pháp: Nghiên cứu mô tả hồi cứu, gồm 126 bệnh nhân ung thư dạ dày được phẫu thuật nội soi hoàn toàn và phẫu thuật nội soi hỗ trợ cắt toàn bộ dạ dày vét hạch D2, từ 2013 đến 2020 Kết quả: Tuổi trung bình 60,6 ± 11,1 tuổi. Tỷ lệ nam/nữ 2.8/1. Ung thư ở giai đoạn I, II, III là 19,0%, 49,2%, 31,7%. Ung thư biểu mô tuyến nhú và ống là 70,6% và tế bào nhẫn là 24,6%. Tỷ lệ tai biến trong mổ của nhóm PTNS hoàn toàn là 4,4% và PTNS hỗ trợ 20,6%. Số hạch nạo vét được trung bình của 2 nhóm PTNS hoàn toàn là 23,7 ± 7,1 hạch và PTNS hỗ trợ là 18,0 ± 7,2 hạch. Lượng máu mất trung bình của PTNS hoàn toàn 30,56 ± 10,2 ml và PTNS hỗ trợ 36,11 ± 9,9 ml. Thời gian phẫu thuật trung bình của nhóm PTNS hoàn toàn là 206,4 ± 30,6 phút và PTNS hỗ trợ 220 ± 40,9 phút. Tỷ lệ biến chứng sau mổ của nhóm PTNS hoàn toàn là 4,4% và PTNS hỗ trợ là 22,3%. Thời gian nằm viện trung bình của nhóm PTNS hoàn toàn là 7,5 ± 2,1 ngày và PTNS hỗ trợ là 10,2 ± 2,4 ngày. Kết luận: Phẫu thuật nội soi hoàn toàn và phẫu thuật nội soi hỗ trợ cắt toàn bộ dạ dày nạo vét hạch D2 do ung thư là kỹ thuật an toàn và hiệu quả trong điều trị ung thư dạ dày. ABSTRACT EVALUATION OF OUTCOMES TOTALLY LAPAROSCOPIC TOTAL GASTRECTOMY AND LAPAROSCOPIC - ASSISTED TOTAL GASTRECTOMY WITH D2 LYMPH NODE DISSECTION DUE TO CANCER Introduction: To evaluate the results of totally laparoscopic total gastrectomy (TLTG) and laparoscopicassisted total gastrectomy (LATG) with D2 lymph node dissection to treat gastric cancer in the Nghean General Friendship Hospital. Materials and Methods: In a retrospective cohort study, 126 patients with gastric cancer underwent TLTG and LATG with D2 lymph node dissection between 2013 and 2020. Results: There were 126 patients with an average age of 60.6 ± 11.1 years. The male/female ratio was 2.8/1. The percent of patients with tumors at stages I, II, III were 19.0%, 49.2%, 31.7%, 70.6% of patients had papillary adenocarcinoma and tubular adenocarcinoma. Patients with ring cell carcinoma wereaccounted for 24.6%. The total percent of incidents during the surgery of the group of TLTG was 4.4%, and the group of LATG was 20.6%. The average number of harvested lymph nodes in the group of TLTG was 23.7 ± 7.1, and the group of LATG was 18.0 ± 7.2. The average blood loss in the group of TLTG was 30.56 ± 10.2 ml, and the group of LATG was 36.11 ± 9.9 ml, and the average operation time in the group of TLTG was 206.4 ± 30.6 minutes, and the group of LATG was 220 ± 40.9 minutes. The total percent of postoperative complications in the group of TLTG was 4.4%, and the group of LATG was 22.3%. The hospital stays in the group of TLTG was 7.5 ± 2.1 days, and the group of LATG was 10.2 ± 2.4 days. Conclusions: TLTG and LATGwith D2 lymph node dissectionwere safe and effective in treating gastric cancer. Keywords: Laparoscopic gastrectomy, gastric cancer, total gastrectomy

Delayed Ettringite Formation (DEF) is an internal sulfate attack caused by heat-induced decomposition and/or prevention of normal ettringite formed during the initial hydration of cement at elevated temperature (above about 70°C) and its re-crystallization in the hardened matrix. This reaction is a physico-chemical phenomenon inducing an expansion of the cement paste that could lead to cracking of cementitious matrix. These cracks result in a decrease in the mechanical performances and durability parameters of the material. However, the internal sulfate attack is characterized by a very slow reaction kinetics and therefore it is difficult to study it in laboratories. This research developed an accelerated method focused on mortar specimens; it is based on electrochemical techniques in order to speed the leaching of alkalis that could be accelerated the DEF.

Introduction: The aim of this study is to evaluate the outcomes, feasibility and safety of laparoscopic Heller – Dor method in treatment of esophageal achalasia or achalasia . Material and Methods: it’s a descriptive cross-sectional study. The patients diagnosed an achalasia and underwent laparoscopic Heller myotomy and Dor fundoplication from 2014 to July 2019 enrolled. Results: 12 patients diagnosed an achalasia were operated on by laparoscopic Heller myotomy and Dor fundoplication. Age mean 40.8 ± 4.2 (18 -65), male 58.3% and female 41.7%. 83.3% of patients have dysphagia, mean dysphagia time 12.8 ±5.2 (2-60) months, vomiting: 41.7% and weight loss: 100%, average weight loss was 6.7 ± 5.5 (3-15) kg ???.=> does not make sense ! X-ray with contrast of esophageal revealed bird beak sign: 41.7%, sigmoid form 16.7% normal or slight dilation 41.6%. ?? The average operation time was 138.8 ± 9,4 (77-180) mins. The complication occurred during the surgery (bleeding converted to open surgery). No other complications such as perforation occurred during and after the surgery. The average length of postoperative hospital stay was 7.5 ± 0.5 (5-11) days. Quality of life after surgery was very good and good in 83.3% and average 16.7%. Conclusion: Laparoscopic surgery in treatment of achalasia by Heller – Dor technique was safe and effective, with less postoperative pain, fast recovery and short hospital length stays. Almost patients satisfied with the results of this procedure. However, due to the sample size of this study is small so it is necessary to conduct other studies with larger sample size.

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