Oxanosine 3r, 5-amino-3-beta-(d-ribofuranosyl)-3H-imidazo[4,5-d][1,3]oxazine-7-one, was isolated as a novel nucleoside antibiotic in 1981 from Streptomyces capreolus MG265-CF3. Oxanosine became relevant in toxicology in 1996 with the discovery that it is formed in nitrosative guanosine deamination. As part of studies of the mechanism of oxanosine formation, the synthesis was attempted of [7- 18...

The aromaticity of the dianion (2) and the antiaromaticity of the dication (3) of tetrabenzo[5.5]fulvalene have been evaluated through magnetic criteria, (1)H NMR shifts, nucleus-independent chemical shifts, NICS, and magnetic susceptibility exaltation, Lambda. The sum of the NICS values, using the GIAO (gauge-independent atomic orbital) method, for 2 is -35.2; that of 3 is +38.2, indicating th...

UNLABELLED BACKGROUND Chalcones are ubiquitous natural compounds with a wide variety of reported biological activities, including antitumoral, antiviral and antimicrobial effects. Furthermore, chalcones are being studied for its potential use in organic electroluminescent devices; therefore the description of their spectroscopic properties is important to elucidate the structure of these mol...

Protonation of parent azulene (1), homoazulene (8), representative isomeric benzazulenes (9, 9A, and 9B), and benzohomoazulenes (10, 10A, and 10B) as well as the mono- and diprotonation of isomeric azulenoazulenes (11-16) were studied by DFT at the B3LYP/6-31G(d) level. The most likely carbocations were identified based on relative protonation energies. For comparison, complete experimental 13C...

Mục tiêu: Mô tả đặc điểm hình ảnh cắt lớp vi tính chùm tia nón gãy xương hàm dưới do tai nạn giao thông và đánh giá mối liên quan giữa lâm sàng thái đường gãy. Đối tượng, phương pháp: Nghiên cứu mô ngang trên 76 bệnh nhân chấn thương nhập viện điều trị nội trú được chẩn đoán X quang thường quy tại Bệnh Trung ương Huế từ tháng 11/2021 đến 01/2023. Kết quả: Chủ yếu là nam giới (89,5%), độ tuổi 19...

Mục tiêu: Phân tích nhu cầu chăm sóc giảm nhẹ của bệnh nhi ung thư đang điều trị tại viện K cơ sở Tân Triều năm 2022. Đối tượng và phương pháp nghiên cứu: mô tả cắt ngang được thực hiện trên 203 cha mẹ để đánh giá cho con họ với bộ câu hỏi phát vấn theo 3 cấp độ 34 tiểu mục nằm trong 5 nội dung nhẹ: Nhu hỗ trợ thể chất; Tâm lý, tinh thần; Giao tiếp, quan hệ; Tài chính, phúc lợi xã hội; Thông ti...

α-amylase has been studied extensively from various sides. this enzyme is used in many industries .many applications of this enzyme have encouraged us for greater attempts on the study of α-amylase and to search for more effective processes. in this investigation, the structure of nanotube - catalytic site of bacillus subtilis α- amylase was optimized by hyperchem 7.0 and then it was investigat...

in this research, the magnetite nanoparticles (fe304) were prepared by coprecipitation of fe- andginger is a well known spice and flavoring agent which has also been used in traditional medicine inmany countries. ginger contains essential oils including gingerol and zingiberene. it also containspungent principles such as zingerone, and shogaol. in the paper six theoretical methods were used toc...

Influence of Aluminum, Gallium, Indium- Doping on the Boron-Nitride Nanotubes (BNNTs) investigated with density functional theory (DFT) and Hartreefock (HF) methods. For this purpose, the chemical shift of difference atomic nucleus was studied using the gauge included atomic orbital (GIAO) approch. In the following, structural parameter values, electrostatic potential, thermodynamic parameters,...