Based on insight into the amine-CO 2 chemistry from quantum chemical calculations, we designed and developed energy efficient amine solid sorbents for CO 2 capture. Novel amine absorbent were synthesized and used for ...
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Based on insight into the amine-CO 2 chemistry from quantum chemical calculations, we designed and developed energy efficient amine solid sorbents for CO 2 capture. Novel amine absorbent were synthesized and used for the wet impregnation into mesoporous materials. The blending effect on the CO 2 capture was also investigated for various amine absorbents. The developed amine solid sorbents showed high performance in terms of adsorption capacity, desorption efficiency, and regeneration energy.
This article reviews the different steps taken during the past 20 years for the prevention and control of non-communicable diseases (NCDs) in the Seychelles. National surveys revealed high levels of several cardiovasc...
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This article reviews the different steps taken during the past 20 years for the prevention and control of non-communicable diseases (NCDs) in the Seychelles. National surveys revealed high levels of several cardiovascular risk factors and prompted an organized response, starting with the creation of an NCD unit in the Ministry of Health. Information campaigns and nationwide activities raised awareness and rallied increasingly broad and high-level support. Significant policy was developed including comprehensive tobacco legislation and a School Nutrition Policy that bans soft drinks in schools. NCD guidelines were developed and specialized 'NCD nurses' were trained to complement doctors in district health centers. Decreasing smoking prevalence is evidence of success, but the raising so-called diabesity epidemic calls for an integrated multi-sector policy to mould an environment conducive to healthy behaviors. Essential components of these efforts include: effective surveillance mechanisms supplemented by focused research;generating broad interest and consensus;mobilizing leadership and commitment at all levels;involving local and international expertise;building on existing efforts;and seeking integrated, multi-disciplinary and multi-sector approaches.
The ligand o-phenylenediamine (opda) and its oxidized form, o-benzoquinonediimine (bqdi), act as a fascinating candidate coordinating toward transition metal ions leading to the photochemical hydrogen production in ab...
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The ligand o-phenylenediamine (opda) and its oxidized form, o-benzoquinonediimine (bqdi), act as a fascinating candidate coordinating toward transition metal ions leading to the photochemical hydrogen production in absence of photosensitizers. Herein, we report the systematic study of the interaction between the oxidized form bqdi ligand, tris-(o-benzoquinonediimine) with divalent first-row transition metal series using DFT calculations. The lowest energy structures, bond length, binding energies, frontier molecular orbital analysis, natural bond orbitals, and global reactivity descriptor were calculated using B3LYP/6-311G(d,P) level of theory. The time dependent-DFT at the CAM-B3LYP/6-311+G(d,p) level of theory was applied to determine the electronic structures and the optical spectra. The theoretical binding trend of the divalent first-row transition metal series is decreasing as follows: Cu >Ti > V > Co > Ni > Fe > Cr > Zn >Mn. Among them, the binding potency of iron (II) by the bqdi ligand was not predominantly sturdy as compared to other first-row divalent transition metal ions. The origin of strong coordination with Fe(II) is attributed to its extra capability to induce covalent coordination of bqdi ligands. The complex exhibited two strong peaks at 370 nm and 452 nm, due to the HOMO-3 to LUMO+1 and HOMO-1 to LUMO transitions, respectively. Natural bond orbital analysis showed that the major interaction happens between the N lone pair electrons of the ligand with an anti-bonding orbital of metal ions, in which Ti showed the highest interaction energy than other metal ions. The present systemic DFT study of bqdi ligands with the first-row transition metals strongly encourages the future establishment of photochemical hydrogen production in absence of photosensitizers.
目的制备18-氨基酸注射液,并建立其质量控制方法。方法采用处方中含量较低的原料后加的投料方法,在加入活性炭之后再加入谷氨酸、色氨酸、酪氨酸、胱氨酸等,106℃下灭菌30 m in。结果所制备的产品质量稳定,所含成分损失少,药液颜色浅,...
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目的制备18-氨基酸注射液,并建立其质量控制方法。方法采用处方中含量较低的原料后加的投料方法,在加入活性炭之后再加入谷氨酸、色氨酸、酪氨酸、胱氨酸等,106℃下灭菌30 m in。结果所制备的产品质量稳定,所含成分损失少,药液颜色浅,热原、异常毒性、降压物质等项目均符合规定。结论该制备工艺稳定、简便、可行,质控标准可靠、便捷,可操作性强。
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