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Pollet, Charlotte,Ying, Jia-Ming The Korean Society for History of Mathematics 2017 Journal for history of mathematics Vol.30 No.3
The Chinese algebraic method, the tian yuan shu, was developed during Song period (960-1279), of which Li Ye's works contain the earliest testimony. Two 18th century editors commentated on his works: the editor of the Siku quanshu and Li Rui, the latter responding to the former. Korean scholar Nam Byeong-gil added another response in 1855. Differences can be found in the way these commentators considered mathematical objects and procedures. The conflicting nature of these commentaries shows that the same object, the quadratic equation, can beget different interpretations, either a procedure or an assertion of equality. Textual elements in this paper help modern readers reconstruct different authors' understandings and reconsider the evolution of the definition of the object we now call 'equation'.
Fungal Fermentation of Lignocellulosic Biomass for Itaconic and Fumaric Acid Production
( A. Jimenez-quero ),( E. Pollet ),( M. Zhao ),( E. Marchioni ),( L. Averous ),( V. Phalip ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.1
The production of high-value chemicals from natural resources as an alternative for petroleum-based products is currently expanding in parallel with biorefinery. The use of lignocellulosic biomass as raw material is promising to achieve economic and environmental sustainability. Filamentous fungi, particularly Aspergillus species, are already used industrially to produce organic acid as well as many enzymes. The production of lignocellulose-degrading enzymes opens the possibility for direct fungal fermentation towards organic acids such as itaconic acid (IA) and fumaric acid (FA). These acids have wide-range applications and potentially addressable markets as platform chemicals. However, current technologies for the production of these compounds are mostly based on submerged fermentation. This work showed the capacity of two Aspergillus species (A. terreus and A. oryzae) to yield both acids by solid-state fermentation and simultaneous saccharification and fermentation. FA was optimally produced at by A. oryzae in simultaneous saccharification and fermentation (0.54 mg/g wheat bran). The yield of 0.11 mg IA/g biomass by A. oryzae is the highest reported in the literature for simultaneous solid-state fermentation without sugar supplements.
Itaconic and Fumaric Acid Production from Biomass Hydrolysates by Aspergillus Strains
( A Jimenez Quero ),( E Pollet ),( M Zhao ),( E Marchioni ),( L Averous ),( V Phalip ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.9
Itaconic acid (IA) is a dicarboxylic acid included in the US Department of Energy’s (DOE) 2004 list of the most promising chemical platforms derived from sugars. IA is produced industrially using liquid-state fermentation (LSF) by Aspergillus terreus with glucose as the carbon source. To utilize IA production in renewable resource-based biorefinery, the present study investigated the use of lignocellulosic biomass as a carbon source for LSF. We also investigated the production of fumaric acid (FA), which is also on the DOE’s list. FA is a primary metabolite, whereas IA is a secondary metabolite and requires the enzyme cisaconitate decarboxylase for its production. Two lignocellulosic biomasses (wheat bran and corn cobs) were tested for fungal fermentation. Liquid hydrolysates obtained after acid or enzymatic treatment were used in LSF. We show that each treatment resulted in different concentrations of sugars, metals, or inhibitors. Furthermore, different acid yields (IA and FA) were obtained depending on which of the four Aspergillus strains tested were employed. The maximum FA yield was obtained when A. terreus was used for LSF of corn cob hydrolysate (1.9% total glucose); whereas an IA yield of 0.14% was obtained by LSF of corn cob hydrolysates by A. oryzae.
Toward high performance of zinc-air battery using hydrophobic carbon foam-based diffusion electrode
Yimai Chen,Hui Wang,Shan Ji,Bruno G. Pollet,Rongfang Wang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
NaCl is used as template to form porous carbon during the carbonization procedure. It is found that theNaCl amount played an important role in the physical properties of hydrophobic carbon materials. Whenthe current density increases from 0 to 50 mA cm 2, the obtained sample containing zinc-air batterypotential decreases from +1.492 V and +1.040 V (vs. RHE); a potential drop very close to that of the Pt/Celectrode (from +1.489 V to +1.043 V). It is also found that in continuous discharge operations at25 mA cm 2, the obtained material exhibits a stable discharge behavior, comparable to Pt/C.
Cyril Auger,Ce´cile Arnold,Ce´line Marx,Brigitte Pollet,Vale´rie B. Schini-Kerth 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.1
Since polyphenol-rich products such as red wine, grape juice, and grape extracts have been shown to induce potent endothelium-dependent relaxations, we have evaluated whether commercial fruit juices such as those from berries are also able to induce endothelium-dependent relaxations of isolated coronary arteries and, if so, to determine whether this effect is related to their phenolic content. Among the 51 fruit juices tested, 2/12 grape juices, 3/7 blackcurrant juices, 4/5 cranberry juices, 1/6 apple juices, 0/5 orange juices, 2/6 red fruit and berry juices, 3/6 blends of red fruit juices, and 0/4 non-red fruit juices were able to induce relaxations achieving more than 50% at a volume of 1%. The active fruit juices had phenolic contents ranging from 0.31 to 1.86 g GAE/L, which were similar to those of most of the less active juices with the exception of one active grape juice (2.14 g GAE/L) and one active blend of red fruit juices (3.48 g GAE/L). Altogether, these findings indicate that very few commercial fruit juices have the ability to induce potent endothelium-dependent relaxations, and that this effect is not related to their quantitative phenolic content, but rather to their qualitative phenolic composition.