Flavonol and lignan glycosides from datura metel l - Nguyen Thi MaiOur chemical study of the acidic methanol extract of the D. metel whole plants led to the isolation and identification of five compounds, namely: kaempferol 3-O-β-D-glucosyl(1→2)-β- D-galactoside 7-O-β-D-glucoside (1), kaempferol 3-O-β-D-glucopyranosyl(1→2)-β-Dglucopyranoside-7-O-α-L-rhamnopyranoside (2), pinoresinol O-β-D-glucopyranoside (3), (...
8 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 491 | Lượt tải: 0
Settling time assignment with pid - Nguyen Doan PhuocIn the work, a PID design method with desired settling time is proposed for plants with transfer functions of the following types: first-order system, second-order system and integral first-order system. The method provides better performances than both the magnitude optimum method and the symmetric optimum method in the sense of overshoot and s...
11 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 533 | Lượt tải: 0
Design and simulation analysis of an electrostatic actuator for improving the performance of scanning probe nanolithographyWe reported on a symmetrically operated electrostatic actuator for improving the performance of scanning probe lithography. An analytical approach to evaluate the natural frequencies and capacitance of the probe was presented and verified by finite element method. The operation characteristics wee analyzed by using finite element method, which w...
10 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 494 | Lượt tải: 0
Structure elucidation of four steroids from the soft coral sinularia nanolobata - Ninh Thị NgọcCompound 2 was also obtained as a white powder. The 13C-NMR and HSQC spectra confirmed 30 carbon signals including seven methyls, eight methylenes, eleven methines, and four quaternary carbons. The signals at δC 11.56 (C-18), 20.50 (C-19), 20.53 (C-21), 20.45 (C- 26), 21.60 (C-27), 14.31 (C-28), and 13.82 (C-29) indicated the presence of seven m...
5 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 458 | Lượt tải: 0
Using experimental planning to optimize the hydrolysis of sugar cane bagasse into fermentable sugars for bioethanol production by fungal enzyme mixtureThe result has identified optimal conditions for bioconversion of sugar cane bagasse into reducing sugars by mixed enzymes (Cell/Xyl, AltFAE, XpoAE ) at 400C, pH =5, 48 h incubation with the ratio of enzyme (Cell/Xyl, AltFAE, XpoAE) and substrate (sugar cane bagasse meal) are 3.1. The applying the experimental planning method led to find the mat...
10 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 568 | Lượt tải: 0
Application of passive remote sensing to investigate transmissivities of trees canopies using ground-Based upward-looking microwave radiometersBased on the field measurement campaign in 2015 and 2016, performed by using groundbased upward-looking microwave radiometers in L band and X band microwave transmissivities of khaya senegalensis canopies the brightness temperatures and the transmissivity of the canopy have been calculated and discussed. These results provide empirical evidence ...
13 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 578 | Lượt tải: 0
Uptake capacity of metals (Al, Cu, Pb, Sn, Zn) by Vetiveria zizanioides in contaminated water from Dong Xam metal production trade village, Thai Binh, VietnamThe present study showed that vetiver could highly accumulate metals Al, Cu, Pb, Sn and Zn in the upper part of the shoot. Thus, the vetiver may serve as an important means for waste water treatment. The roots and upper parts of shoots accumulated Al concentration from 17-30 times and 1.2 times higher than “reference plant”, respectively. T...
11 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 592 | Lượt tải: 0
Synthesis of (5r*,6r*)-6-(3-(tertbutyldimethylsilyloxy)prop-1-ynyl)-5- hydroxypiperidin-2-one - Dau Xuan DucWe have examined two pathways to synthesize a cis disubstituted piperidinone. The first one was not efficient due to the failure in conversion of 3 to 14. Following the second route we have synthesized the racemic (5R*,6R*)-6-(3-(tert-Butyldimethylsilyloxy)prop-1-ynyl)-5- hydroxypiperidin-2-one in 10.3 % overall yield over 7 steps.
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 588 | Lượt tải: 0
Ammonium transport experiments in soil columns: estimating transport parameters - Nguyễn Thị Minh TrangBased on the conservative tracer experiments (Cl-), the longitudinal dispersivity λ and the hydrodynamic dispersion coefficient D of Con Son soil were estimated to 0.2 cm and 8.40 cm2 h- 1, respectively. The small values found, indicates that the used soil is a relatively homogeneous porous media. The ammonium BTCs for six aqueous concentrations...
12 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 501 | Lượt tải: 0
Different fructose feeding strategies for poly(3-Hydroxybutyrate) production byyangia sp. nd199The study showed that the strain Yangia sp. ND199 belongs to second PHA producer group that canaccumulate PHB together with cell growth. CDW of 7.8 g/l and PHB content of 49 wt% were achieved in batch fermentation. High CDW of 78.5 g/l and PHB content of 67.5 wt% were obtained by using two-stage fed-batch fermentation in which the first stage wa...
7 trang | Chia sẻ: honghp95 | Ngày: 01/12/2020 | Lượt xem: 593 | Lượt tải: 0
