Duas novas flavanonas naturais, 5-hidroxi-6,7-(2”,2”-dimetilcromeno)flavanone (1) e 5-metoxi3-hidroxi-6,7-(2”,2”-dimetilcromeno)flavanone (2), foram isoladas dos extratos das raízes de L. yucatanensis e L. xuul, respectivamente. Adicionalmente, quatro novos metabólitos, os flavanóides glicosídicos quercetina-3-ramnoglucosídeo e caempferol-3-ramnoglucosídeo, juntamente com 4hidroxi-N-metil-proli...

Improving the quality of 4H silicon carbide (4H-SiC) epitaxial layers to reduce leakage current 4H-SiC based high-power devices is a long-standing issue in development homoepitaxy. In this work, we compare effect different type dislocations, and discriminate dislocation lines dislocation-related pits on by combining molten-KOH etching tunneling atomic force microscopy (TUNA) measurements. It fo...

The structural, five different elastic constants and electronic properties of 2Hand 4H-Silicon carbide (SiC) are investigated by using density functional theory (DFT). The total energies of primitive cells of 2Hand 4H-SiC phases are close to each other and moreover satisfy the condition E2H >E4H . Thus, the 4H-SiC structure appears to be more stable than the 2Hone. The analysis of elastic prope...

Two novel acrylate monomers, [5-(benzyloxy)-4-oxo-4H-pyran-2-yl]methyl acrylate and {1-[(5-(benzyloxy)-4-oxo-4H-pyran-2-yl)methyl]-1,2,3-triazol-4-yl}methyl acrylate were synthesized by the reaction of 5-benzyloxy-2-(hydroxymethyl)-4H-pyran-4-one and 5-(benzyloxy)-2-{[4-(hydroxymethyl)-1,2,3-triazol-1-yl]methyl}-4H-pyran-4-one with acryloyl chloride in the presence of triethylamine, respectivel...

Artemisinin is a sesquiterpene lactone endoperoxide extracted from a traditional Chinese medicinal plant Artemisia annua. Artemisinin-based combination therapies (ACTs) are recommended as the best treatment of malaria by the World Health Organization (WHO). Both the phytohormone jasmonic acid (JA) and light promote artemisinin biosynthesis in A. annua. Interestingly, we found that the increase ...

BACKGROUND Pol III-related leukodystrophies, including 4H leukodystrophy, are recently recognized disorders that comprise hypomyelination and various neurologic and non-neurologic clinical manifestations. We report the unique neurologic presentation of the micturition dysfunction in Pol III-related leukodystrophy and describe the novel endocrine abnormalities in this entity. CASE PRESENTATION...

High-efficiency and low-loss processing is the mainstay to reduce cost deepen application of 4H silicon carbide (4H-SiC) wafers in high-power high-frequency electronics. In this study, high-yield slicing 4H-SiC realized by combining femtosecond laser irradiation bandgap-selective photo-electrochemical (PEC) exfoliation. By light-absorption measurements, micro-Raman, micro-photoluminescence char...

A series of new 1,2/1,3-bis[o-(N-methylidenamino-3-aryl-5-phenyl-4H-1,2,4-triazole-4-yl)phenoxy]ethane/propane derivatives 4 were prepared in good yields by treatment of 4-amino-3-aryl-5-phenyl-4H-1,2,4-triazoles 2 with certain bis-aldehydes 1.Compounds 4 were reduced with NaBH(4) to afford the corresponding 1,2/1,3-bis[o-(N-methylamino-3-aryl-5-phenyl-4H-1,2,4-triazole-4-yl)phenoxy]ethane/prop...

4H-1,4-Benzothiazines and its derivatives are potential pharmacologically and industrially useful agents. They were prepared by condensation followed by oxidative cyclization of 2-amino-4,6-dimethylbenzenethiol with varied βdiketones/β-ketoesters in dimethyl sulfoxide. On refluxing with H2O2 in glacial acetic acid, the substituted 4H-1,4Benzothiazines yielded 4H-1,4-Benzothiazine-1,1-dioxides (...