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Gosse Overal, Bas Teusink, Frank J Bruggeman, Josephus Hulshof, Robert Planqué
Yeast glycolysis has been the focus of research for decades, yet a number of dynamical aspects of yeast glycolysis remain poorly understood at present. If nutrients are scarce, yeast will provide its catabolic and energetic needs with other pathways, but the enzymes catalysing upper glycolytic fluxes are still expressed. We conjecture that this overexpression facilitates the rapid transition to glycolysis in case of a sudden increase in nutrient concentration. However, if starved yeast is presented with abundant glucose, it can enter into an imbalanced state where glycolytic intermediates keep accumulating, leading to arrested growth and cell death...
March 14, 2018: Mathematical Biosciences
Ya Cheng, Ye Li, Tinglin Huang, Yuankui Sun, Xinxin Shi, Yuezong Shao
As an efficient method for ammonium (NH4 + ) removal, contact catalytic oxidation technology has drawn much attention recently, due to its good low temperature resistance and short start-up period. Two identical filters were employed to compare the process for ammonium removal during the start-up period for ammonium removal in groundwater (Filter-N) and surface water (Filter-S) treatment. Two types of source water (groundwater and surface water) were used as the feed waters for the filtration trials. Although the same initiating method was used, Filter-N exhibited much better ammonium removal performance than Filter-S...
March 2018: Journal of Environmental Sciences (China)
Ran Zhao, Hanmin Zhang, Fan Zhang, Fenglin Yang
N-dodecanoyl homoserine lactone (C12 -HSL) was detected in the supernatant of an anammox granular sludge reactor (AGSR). C12 -HSL could enhance the specific anammox activity of anammox biomass. Adding C12 -HSL-containing AGSR supernatant into the continuously stirred tank reactors reduced the start-up time of the anammox process from 80 to 66days. Moreover, the nitrogen loading rate was also enhanced to 1.6 times that of the control reactor. AHLs could increase the secretion of extracellular polymeric substances and anammox obtained better enrichment with the addition of AHLs-containing AGSR supernatant...
March 2018: Journal of Environmental Sciences (China)
Qian Liu, Yang Yang, Xiaoxue Mei, Bingfeng Liu, Chuan Chen, Defeng Xing
Ferric iron can affect the current generation of microbial electrochemical system (MES); however, how it influences microbial biofilm formation and metabolic activity has not been reported. Here, we describe the response of microbial electrode biofilm communities to insoluble ferric iron (Fe3+ ) at different concentrations in microbial fuel cells (MFCs). Insoluble ferric iron (200μM) improved electrochemical activity of the MFCs microbial biofilms during start-up and resulted in a higher maximum power density of 0...
March 11, 2018: Science of the Total Environment
Dolly A Parasrampuria, Leslie Z Benet, Amarnath Sharma
New drug development is both resource and time intensive, where later clinical stages result in significant costs. We analyze recent late-stage failures to identify drugs where failures result from inadequate scientific advances as well as drugs where we believe pitfalls could have been avoided. These can be broadly classified into two categories: 1) where science is mature and the failures can be avoided through rigorous and prospectively determined decision-making criteria, scientific curiosity, and discipline to follow up on emerging findings; and 2) where problems encountered in Phase 3 failures cannot be explained at this time, as the science is not sufficiently advanced and companies/investigators need to recognize the possibility of deficiency of our knowledge...
March 13, 2018: AAPS Journal
Wan Yang, Shilong He, Ming Han, Bingbing Wang, Qigui Niu, Yujia Xu, Yi Chen, Haibo Wang
In this study, the nitrogen removal performance and microbial community structure were investigated during the start-up, instability, and recovery stages of an anaerobic ammonium oxidation (anammox) reactor loaded with compound carriers (shale ceramsite and suspended ball carrier). The results indicated that the anammox reactor successfully started up on 116th d when the nitrogen loading rate (NLR) reached 0.72 ± 0.05 kg N m-3  d-1 . The anammox reactor ran well with free ammonia (FA) at 13.65 ± 2...
March 10, 2018: Journal of Bioscience and Bioengineering
Tom G L Vandekerckhove, Kanae Kobayashi, Joery Janda, Sam Van Nevel, Siegfried E Vlaeminck
Autotrophic denitrification with sulfur is an underexplored alternative to heterotrophic denitrification to remove nitrate from wastewater poor in organics. The application on ion exchange regeneration water (19.4-32.1 mS cm-1 ) is novel. Three fixed bed reactors were tested at 15 °C for >4 months, inoculated with activated sludge from sewage treatment. All were fast in start-up (<10 days) with high performance (94 ± 2% removal efficiency). pH control with NaOH rendered higher nitrate removal rates than limestone addition to the bed (211 ± 13 vs...
February 13, 2018: Bioresource Technology
John Grundy, Kon Mouzakis, Rajesh Vasa, Andrew Cain, Maheswaree Curumsing, Mohamed Abdelrazek, Niroshine Fernando
By the 2050, it is estimated that the proportion of people over the age of 80 will have risen from 3.9% to 9.1% of population of Organisation for Economic Cooperation and Development countries. A large proportion of these people will need significant help to manage various chronic illnesses, including dementia, heart disease, diabetes, limited physical movement and many others. Current approaches typically focus on acute episodes of illness and are not well designed to provide adequately for daily living care support...
2018: Studies in Health Technology and Informatics
Yunpeng Zhao, Ying Feng, Jianqi Li, Yongzhao Guo, Liming Chen, Sitong Liu
Anammox aggregates have been extensively observed in high-efficiency nitrogen-removal reactors, yet the variation and inherent cause of its aggregation capacity related to reactor operation are still unknown. Here, we used microbial detection, metabolomics, extended DLVO theory and multivariate statistical analysis to address this issue. The aggregation capacity of anammox consortia varied periodically during reactor operation, which was determined by the hydrophobic force and the ratio of extracellular protein (PN) to extracellular polysaccharides (PS)...
March 5, 2018: Environmental Science & Technology
Maciej S Kowalski, Tanner R Devlin, Jan A Oleszkiewicz
Availability of granular anammox sludge is much higher than biofilm seed carriers and the sludge is easier to transport. This paper describes and investigates a formation of mature anammox biofilm originated from granular sludge and proves that an anammox moving bed biofilm reactors (MBBR) can be easily and quickly started-up by seeding with granular sludge. The reactor was fed with synthetic wastewater containing ammonium and nitrite. Successful start-up was completed in as little as 50 days when TN removal increased to more than 80%...
February 22, 2018: Chemosphere
Lin-Quan Tang, Dong-Ping Chen, Ling Guo, Hao-Yuan Mo, Ying Huang, Shan-Shan Guo, Bin Qi, Qing-Nan Tang, Pan Wang, Xiao-Yun Li, Ji-Bin Li, Qing Liu, Yuan-Hong Gao, Fang-Yun Xie, Li-Ting Liu, Yang Li, Sai-Lan Liu, Hao-Jun Xie, Yu-Jing Liang, Xue-Song Sun, Jin-Jie Yan, Yi-Shan Wu, Dong-Hua Luo, Pei-Yu Huang, Yan-Qun Xiang, Rui Sun, Ming-Yuan Chen, Xing Lv, Lin Wang, Wei-Xiong Xia, Chong Zhao, Ka-Jia Cao, Chao-Nan Qian, Xiang Guo, Ming-Huang Hong, Zhi-Qiang Nie, Qiu-Yan Chen, Hai-Qiang Mai
BACKGROUND: Cisplatin-based concurrent chemoradiotherapy is currently considered to be the standard treatment regimen for patients with advanced nasopharyngeal carcinoma, but has well known side-effects such as gastrointestinal reactions, nephrotoxicity, and ototoxicity. Nedaplatin was developed to decrease the toxic effects induced by cisplatin, and in this trial we assessed whether a nedaplatin-based concurrent chemoradiotherapy regimen was non-inferior to a cisplatin-based regimen in patients with locoregional, stage II-IVB nasopharyngeal carcinoma...
February 28, 2018: Lancet Oncology
Xi Tang, Yongzhao Guo, Bo Jiang, Sitong Liu
Increasing attention has been paid to the anammox community for its significant function in high-efficiency wastewater treatment. However, bacterial interaction in terms of bacterial communication is still elusive. This study firstly explored the intra- and interspecific communication of bacteria in the anammox community using metagenomic sequence data obtained during bioreactor operation. We verified the existence of multiple bacterial communication gene (BCG) subtypes by alignment with the constructed BCG database containing 11 identified gene subtypes...
February 28, 2018: Water Research
Felipe Maia de Toledo Piza, Leo Anthony Celi, Rodrigo Octavio Deliberato, Lucas Bulgarelli, Fabricio Rodrigues Torres de Carvalho, Roberto Rabello Filho, Miguel Angel Armengol de La Hoz, Jennifer Cohn Kesselheim
BACKGROUND: Datathons are increasingly organized in the healthcare field. The goal is to assemble people with different backgrounds to work together as a team and engage in clinically relevant research or develop algorithms using health-related datasets. Criteria to assess the return of investment on such events have traditionally included publications produced, patents for prediction, classification, image recognition and other types of software, and start-up companies around the application of machine learning in healthcare...
April 2018: International Journal of Medical Informatics
Javier Calvo, Nadia Raquel García Lara, María Gormaz, Manuela Peña, María José Martínez Lorenzo, Pilar Ortiz Murillo, Josep Maria Brull Sabaté, Carmen María Samaniego, Antoni Gayà
It is widely agreed that the best source of nutrition for the newborn is the milk of their own mothers. In those cases where it is not available, especially in very premature and/or very low birth weight infants, as well as other sick newborns, the preferred choice before formula is the human milk provided by selected donors. This indication is supported by the highest international bodies dedicated to the health of the child population, including the World Health Organisation as well as the main national and international scientific societies in the field of Paediatrics...
February 26, 2018: Anales de Pediatría: Publicación Oficial de la Asociación Española de Pediatría (A.E.P.)
Han Li, Ze Guo, Dafu Wu, Jing Fan, Shaobin Huang, Shaofeng Zhou
A novel medium consisting of iron oxide-coated porous ceramsite (modified ceramsite) was investigated for NO removal under thermophilic conditions in this study. We used a surface coating method with FeCl₃·6H₂O as the modifier. When ceramsite was calcined for 4 h at 500 °C, the surface pH value decreased to 3.46, which is much lower than the isoelectric point of ceramsite, ensuring its surface was electropositive. The surface of modified ceramsite changed from two- to three-dimensional and exhibited excellent adsorption behavior to assist microbial growth; the maximum dry weight of the biofilm was 1...
February 28, 2018: Materials
Ilaria Pigliautile, Anna Laura Pisello
Urban population is predicted to increase rapidly and massively in the next decades, by producing also the exacerbation of urban scale climate change imputable to anthropogenic actions, such as urban heat island. In this view, urban pedestrians assume a key role in determining city livability in dense built environments, typically much more polluted than suburban or rural areas. Despite that, urban heat island experimental studies are pretty focused on data collected by means of permanent microclimate stations for environmental monitoring, also coupled with satellite measurements or mobile stations equipped over transportation media...
February 26, 2018: Science of the Total Environment
Xianglong Xu, Guohua Liu, Yuanyuan Wang, Yuankai Zhang, Hao Wang, Lu Qi, Hongchen Wang
A sequencing batch reactor (SBR)-anaerobic ammonium oxidation (anammox) system was started up with the paddy soil as inoculated sludge. The key microbial community structure in the system along with the enrichment time was investigated by using molecular biology methods (e.g., high-throughput 16S rRNA gene sequencing and quantitative PCR). Meanwhile, the influent and effluent water quality was continuously monitored during the whole start-up stage. The results showed that the microbial diversity decreased as the operation time initially and increased afterwards, and the microbial niches in the system were redistributed...
February 2018: Journal of Environmental Sciences (China)
Yajie Li, Salma Tabassum, Chunfeng Chu, Zhenjia Zhang
In this paper, the inhibition of methanogens by phenol in coal gasification wastewater (CGW) was investigated by both anaerobic toxicity tests and a lab-scale anaerobic biofilter reactor (AF). The anaerobic toxicity tests indicated that keeping the phenol concentration in the influent under 280mg/L could maintain the methanogenic activity. In the AF treating CGW, the result showed that adding glucose solution as co-substrate could be beneficial for the quick start-up of the reactor. The effluent chemical oxygen demand (COD) and total phenol reached 1200 and 100mg/L, respectively, and the methane production rate was 175mLCH4 /gCOD/day...
February 2018: Journal of Environmental Sciences (China)
Sabina Kolbl Repinc, Robert Šket, Domen Zavec, Katarina Vogel Mikuš, Fernando G Fermoso, Blaž Stres
A start-up of 4 MW agricultural biogas plant in Vučja vas, Slovenia, was monitored from 2011 to 2014. The start-up was carried out in 3 weeks with the intake of biomass from three operating full-scale 1-2 MW donor agricultural biogas plants. The samples were taken from donor digesters and from two serial digesters during the start-up over the course of 2.5 years. Bacterial and Archaeal microbial communities progressively diverged from the composition of donor digesters during the start-up phase. The rate of change of Bacterial community decreased exponentially over the first 2...
February 21, 2018: Journal of Environmental Management
Sławomira Bering, Jacek Mazur, Krzysztof Tarnowski, Magdalena Janus, Sylwia Mozia, Antoni Waldemar Morawski
Large, laboratory scale biological treatment tests of real industrial wastewater, generated in a large industrial laundry facility, was conducted from October 2014 to January 2015. This research sought to develop laundry wastewater treatment technology which included tests of a two-stage Moving Bed Bio Reactor (MBBR); this had two reactors, was filled with carriers Kaldnes K5 (specific area - 800 m2 /m3 ) and were realized in aerobic condition. Operating on site, in the laundry, reactors were fed actual wastewater from the laundry retention tank...
February 18, 2018: Science of the Total Environment
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