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A new approach to off-gas analysis for shaken bioreactors showing high CTR and RQ accuracy.
J Biol Eng
January 2025
AVT - Biochemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, D-52074, Aachen, Germany.
Background: Shake flasks are essential tools in biotechnological development due to their cost efficiency and ease of use. However, a significant challenge is the miniaturization of process analytical tools to maximize information output from each cultivation. This study aimed to develop a respiration activity online measurement system via off-gas analysis, named "Transfer rate Online Measurement" (TOM), for determining the oxygen transfer rate (OTR), carbon dioxide transfer rate (CTR), and the respiration quotient (RQ) in surface-aerated bioreactors, primarily targeting shake flasks.
View Article and Find Full Text PDFExperimental study on the influencing factors and pore production law of CO huff-and-puff in tight sandstone reservoirs.
Sci Rep
January 2025
School of Petroleum Engineering, Xi 'an Shiyou University, Xi'an, Shaanxi, China.
In order to determine the influence of different factors on the CO huff-and-puff displacement effect, a CO huff-and-puff experiment was carried out with Chang 6 tight sandstone samples in Ordos Basin as the research object. Combined with nuclear magnetic resonance technology, the influences of injection pressure, cycle numbers and soaking time on the CO huff-and-puff effect were evaluated, and the optimal CO huff-and-puff parameters were optimized. The microscopic degree of crude oil production in different scale pores was quantitatively characterized.
View Article and Find Full Text PDFQuantification and optimization of platinum-molybdenum carbide interfacial sites to enhance low-temperature water-gas shift reaction.
Nat Commun
January 2025
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao, Shandong, P.R. China.
Pt/α-MoC catalysts exhibit exceptional activity in low-temperature water-gas shift reactions. However, quantitatively identifying and fine-tuning the active sites has remained a significant challenge. In this study, we reveal that fully exposed monolayer Pt nanoclusters on molybdenum carbides demonstrate mass activity that exceeds that of bulk molybdenum carbide catalysts by one to two orders of magnitude at 100-200 °C for low-temperature water-gas shift reactions.
View Article and Find Full Text PDFTopological Supramolecular Complexation of Metal-Organic Polyhedra for Tunable Interconnected Hierarchical Microporosity in Amorphous Form.
Angew Chem Int Ed Engl
January 2025
South China University of Technology, South China Advanced Institute for Soft Matter Science and Technology, South China Advanced Institute for Soft Matter Science and Technology, 510640, Guangzhou, CHINA.
The precise engineering of microporosity is challenging due to the interference at sub-nm scale from unexpected structural flexibility and molecular packing. Herein, the concept of topological supramolecular complexation is proposed for the feasible fabrication of hierarchical microporosity with broad tunability in amorphous form. The 2.
View Article and Find Full Text PDFQuantification of micro- and nano-plastics in atmospheric fine particles by pyrolysis-gas chromatography-mass spectrometry with chromatographic peak reconstruction.
J Hazard Mater
January 2025
State Key Laboratory of Advanced Environmental Technology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou 510640, China.
The effects of micro- and nano-plastics (MNPs) on human health are of global concern because MNPs are ubiquitous, persistent, and potentially toxic, particularly when bound to atmospheric fine particles (PM). Traditional quantitative analysis of MNPs by pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) is often inaccurate because of false positive signals caused by similar polymers and organic compounds. In this study, a reliable analytical strategy combining HNO digestion and chromatographic peak reconstruction was developed to improve the precision of pyrolysis-gas chromatography-mass spectrometry analysis of multiple MNPs bound to PM.
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