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Correction to: Detection of Candidatus Neoehrlichia mikurensis in Norway up to the northern limit of Ixodes ricinus distribution using a novel real time PCR test targeting the groEL gene

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BMC microbiology 2020年第1期20卷 9页

作者： Andrew Jenkins Cecilie Raasok Benedikte N Pedersen Kristine Jensen Åshild Andreassen Arnulf Soleng Kristin Skarsfjord Edgar Heidi Heggen Lindstedt Vivian Kjelland Snorre Stuen Dag Hvidsten Bjørn-Erik Kristiansen Department of Natural Science and Environmental Health University of South-Eastern Norway Bø Norway. andrew.jenkins@usn.no. Department of Natural Science and Environmental Health University of South-Eastern Norway Bø Norway. Present address: Nittedal Municipal Water and Drainage Authority Nittedal Norway. Present address: Telemark Trust Hospital Section for Pathology Skien Norway. Department of Virology Norwegian Institute of Public Health Oslo Norway. Department of Pest Control Norwegian Institute of Public Health Oslo Norway. Department of Engineering and Science University of Agder Kristiansand Norway. Sørlandet Trust Hospital Research Unit Kristiansand Norway. Department of Production Animal Clinical Sciences Norwegian University of Life Sciences Sandnes Norway. Department of Microbiology and Infection Control University Hospital of North Norway Tromsø Norway. Department of Process Energy and Environmental Technology University of South-Eastern Norway Porsgrunn Norway.

After publication of our article [1] it came to our notice that the source of the sequence for the control plasmid, pNeo (Materials and methods: Controls) was incorrectly stated as AB094461. The correct accession numb...

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Environmental performance of bioethanol production from oil palm frond petiole sugars in an integrated palm biomass biorefinery

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IOP Conference Series: Materials Science and engineering 2018年第1期368卷

作者： S J H M Yusof A M Roslan K N Ibrahim S S S Abdullah M R Zakaria M A Hassan Y Shirai Department of Food and Process Engineering Faculty of Engineering Universiti Putra Malaysia 43400 Serdang Selangor Malaysia School of Bioprocess Engineering Universiti Malaysia Perlis Kompleks Pusat Pengajian Jejawi 3 Kawasan Perindustrian Jejawi 02600 Arau Perlis Malaysia Department of Bioprocess Technology Faculty of Biotechnology and Biomolecular Sciences Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Laboratory of Biopolymer and Derivatives Institute of Tropical Forestry and Forest Products (INTROP) Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Section of Environmental Engineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Vendor City Taboh Naning 78000 Alor Gajah Melaka Malaysia Section of Bioengineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Vendor City Taboh Naning 78000 Alor Gajah Melaka Malaysia Department of Biological Functions and Engineering Graduate School of Life Science and System Engineering Kyushu Institute of Technology 2-4 Hibikino Wakamatsu Fukuoka 808-0916 Japan

Generation of biofuels from renewable resources such as lignocellulosic biomass is a promising approach to reduce the sole reliability on the depleting fossil fuel. The aim of this work is to assess the potential environmental impact of bioethanol production from oil palm frond in a conceptual oil palm based biorefinery model, utilizing wet disc milling as a pretreatment method. A cradle-to-gate approach was selected, beginning with the harvesting and transportation of the frond petiole from the plantation, followed by production of oil palm frond petiole sugars via pretreatment and saccharification prior to bioethanol fermentation, and finally purification of the fermentation products to obtain anhydrous bioethanol. A life cycle assessment was performed using CML 2 baseline 2000 method (SimaPro v8.0), where ten impact categories were evaluated. It was found that the most significant environmental impact was from sugar recovery process with contribution of more than 90 %. This is mainly due to high power consumption by wet disc milling during pretreatment. Apart from that, production of enzyme and chemicals which were used during saccharification consumes high energy thus contributing major problems to the surrounding. Finding of this study helps to identify the hotspot which can be improved to establish a more energy efficient and greener system for bioethanol production from oil palm frond petiole sugars.

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Effervescent atomization of O/W-emulsions: Effect of viscosity ratio and process parameters on oil drop size 13

Effervescent atomization of O/W-emulsions: Effect of viscosi...

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13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015

作者： Kleinhans, A. Gaukel, V. Schuchmann, H.P. Institute for Process Engineering in Life Sciences Section I: Food Process Engineering Karlsruhe Institute of Technology Karlsruhe Germany

Spray-dried food powders often contain oil. In the liquid feed, the oily phase is emulsified to drops in the lower µm size range. Powder and rehydrated liquid product properties strongly depend on the oil drop size distribution. We therefore investigate the effect of stresses occurring during atomization on the oil drop size distribution. In this study we used an effervescent atomizer which is a special type of internal mixing pneumatic atomizer with a measurably lower atomization gas consumption compared to external mixing pneumatic atomizers. The design of the mixing chamber, the operating pressure, the ALR (air-to-liquid-ratio by mass) and the feed viscosity are crucial parameters which influence the emerging flow patterns (gas/liquid) in the mixing chamber. This in turn influences the occurring stresses which are responsible for spray forming, but also may force an oil drop break up in the nozzle. A model emulsion consisting of water, different silicon oils, Tween20 and PEG20,000 was atomized at varying parameters. The gas/liquid flow patterns in the mixing chamber were visualized by a high speed camera. The spray drop size and spray pulsation were measured online using a laser diffraction spectroscope (Malvern Spraytec). Before and after the atomization the oil drop size was analyzed offline by a laser diffraction spectroscope (Retsch Horiba LA950). The results for oil drop break up showed a decreasing oil drop size with decreasing viscosity ratio (ratio of viscosity of disperse phase to emulsion viscosity) and increasing ALR. An influence of flow pattern and resulting pulsation of the spray on the oil drop size distribution was found. For slug flow in the mixing chamber, the mean oil drop size increased compared to oil drop sizes generated by annular flow. Effects are of relevance for the production of spray dried dairy powders, e.g. toppings, or oil encapsulation targets. © 2015 International Conference on Liquid Atomization and Spray Systems. All rights rese

关键词： Atomization

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Sustainable enzymatic synthesis of glycolipids in a deep eutectic solvent system

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Journal of Molecular Catalysis B: Enzymatic 2016年 133卷 S281-S287页

作者： Siebenhaller, Sascha Muhle-Goll, Claudia Luy, Burkhard Kirschhöfer, Frank Brenner-Weiss, Gerald Hiller, Ekkehard Günther, Michael Rupp, Steffen Zibek, Susanne Syldatk, Christoph Institute of Process Engineering in Life Sciences Section II: Technical Biology Karlsruhe Institute of Technology Karlsruhe Germany Institute of Organic Chemistry and Institute for Biological Interfaces 4 Karlsruhe Institute of Technology Karlsruhe Germany Institute of Functional Interfaces Karlsruhe Institute of Technology Karlsruhe Germany Fraunhofer Institute for Interfacial Engineering and Biotechnology Stuttgart Germany

Environmental friendly (bio-) chemical synthesis reactions are getting ever more important for the production of ecofriendly products. In this study a reaction system based on a deep eutectic solvent consisting of choline chloride and various sugars, was used for the enzymatic synthesis of glycolipids. A wide variety of potential substrates were tested for the enzymatic glycolipid synthesis in DES, including various sugars and one anhydro-sugar in combination with up to 9 different fatty acids. It was proven that the described DES-based solvent system is suitable for the enzymatic synthesis of tailor-made glycolipids. The proposed lipase-catalyzed acylation of the different sugars, which are substrate and part of the solvent at the same time, was detected by TLC-MALDI-ToF, ESI-Q-ToF and additional MS/MS experiments. As an example of all the synthesized glycolipids, fragments and m/z signals of the expected glycolipid arabinose-4-O-laurate was detected, and its chemical structure was elucidated via NMR. © 2017 Elsevier B.V.

关键词： Sugars

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Computer simulation of low pressure casting process using flow 3D™

Computer simulation of low pressure casting process using fl...

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International Conference on Advanced Materials and Manufacturing processes for Strategic Sectors, ICAMPS 2015

作者： Viswanath, Abhilash Sivaraman, Savithri Pillai, Uma Thanu Subramonia Metals and Materials Section Materials Science and Technology Division CSIR- National Institute for Interdisciplinary Science and Technology ThiruvananthapuramKerala India Computational Modelling and Simulation Process Engineering and Technology Division CSIRNational Institute for Interdisciplinary Science and Technology ThiruvananthapuramKerala India

ISBN: (纸本)9783038355366

The calibre of low pressure casting (LPC) process in meeting the demands for improved quality and aesthetics for thin walled components has been widely accepted in casting industries. In spite of numerous advantages, the process is still being used very less to its potential. The basic reason has been the difficulty in determining various processing parameters associated which can be circumvented effectively by numerical simulation. In the present work, the commercial CFD code FLOW 3D™, has been used to simulate the mould filling and solidification during the LPC process. © (2015) Trans Tech Publications, Switzerland.

关键词： Molds

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The use of topology optimization in shaping the strength of castings

The use of topology optimization in shaping the strength of ...

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Conference on Future engineering, 2014

作者： Pysz, Stanislaw Malysza, Marcin Pieklo, Jaroslaw Eng. Foundry Research Institute Centre of Designing and Prototyping Cracow Poland Eng. University of Science and Technology Department of Foundry Process Engineering Section of Foundry Machines and Casting Design Poland

ISBN: (纸本)9783038353355

The article discusses some of the issues associated with the use of topology optimization in shaping of the strength of castings. This kind of optimization is performed in the preliminary design phase, when the shape of the constructed part is not yet defined. The limitations that apply to the designing process concern the dimensions, boundary conditions, loads, forces, and cooperation with other structural elements. Topology optimization determines the arrangement of the material in space, so that under the conditions of loads, exploitation, and the design assumptions, the construction will have smallest possible weight. The article presents a few methods of optimization and provides simple examples. The computer calculations were carried out based on, the Finite Element Method (the Abaqus software), and the authors' subroutines optimization algorithm that uses the results obtained in FEM. The example of the method to optimize the shape of mine shaft tubing is presented. The verification of the casting technology was conducted in MAGMASoft, taking into account the influence of the topology optimization on the production possibilities. © (2015) Trans Tech Publications, Switzerland.

关键词： Shape optimization

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The Voidage in a CFB Riser as Function of Solids Flux and Gas Velocity

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Procedia engineering 2015年 102卷 1112-1122页

作者： Huili Zhang Jan Degrève Jan Baeyens Raf Dewil KU Leuven Department of Chemical Engineering Chemical and Biochemical Process Technology and Control Section De Croylaan 46 Heverlee 3001 Belgium University of Warwick School of Engineering Coventry CV4 7AL United Kingdom KU Leuven Department of Chemical Engineering Process and Environmental Technology Lab J. De Nayerlaan 5 Sint-Katelijne-Waver 2860 Belgium

Circulating Fluidised Beds (CFBs) are widely applied in the process industry, for mostly gas-solid and gas-catalytic reactions. The riser is the key component of the CFB being the process reactor. The important design parameters are the operating gas velocity (U) and the solids concentration flux (G). The CFB operation starts at moderate to high superficial gas velocities. Its voidage exceeds ∼ 0.9 and is a function of the solids circulation flux. Different flow modes have been presented in literature, and result in an operation diagram where G and U delineate specific operations, from dilute riser flow, through core-annulus flow, to dense riser upflow (mostly at any U, G exceeding 80 to 120 kg m -2 s -1 ). Increasing G whilst maintaining the gas velocity will cause an increase in suspension concentration. The riser flow can hence be characterized by its apparent voidage, ɛ. In the core-annulus operation, clusters of particles reflux near the wall, thus influencing the local radial voidage in the cross section of the riser, and also extending over a given distance, δ, from the wall to the core . Through measurements in CFBs of 0.1 and 0.14 m I.D., the research has been able to determine the average axial and radial voidages of the dense phase within the different regimes, whilst also determining the thickness of the annulus (in CAF-mode). Experimental results will be illustrated and compared with previous empirical equations, shown to have a limited accuracy only both for ɛ, and for the thickness of the annulus in CAF operation. Within the operating conditions tested, results demonstrate that the annulus thickness is about 15 to 20% of the riser diameter in CAF, and that the voidage in the riser is a function of U and G, with riser diameter and distance along the riser length as secondary parameters.

关键词： circulating fluidized bed riser voidage annulus thickness

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Comparison of Microbial Growth on Fish Waste Peptones from Different Hydrolysis Methods

Comparison of Microbial Growth on Fish Waste Peptones from D...

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2015 5th International Conference on Biomedical engineering and technology

作者： Nurdiyana Husin Siti Mazlina Mustapa Kamal Ling Tau Chuan Nurul Fadzni Muhammad Norhani Jusoh Section of Bioengineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology (Uni KL MICET) Dept. of Process and Food Engineering Faculty of Engineering Universiti Putra Malaysia Institute of Biological Sciences Faculty of Science Building University of Malaya

This study utilized mixture of sardine and mackerel wastes from fish processing industry for peptone recovery. The recovered peptones from different methods of hydrolysis（alkaline and enzymatic） were supplied as nitrogen sources for microbial growth. Peptone performance in microbial growth was found to be affected by hydrolysis method. Saccharomyces cerevisiae growth using peptone from enzymatic（Alcalase enzyme） was superior compared to its growth using other types of peptone. The same trend was observed for Bacillus subtilis growth. Hydrolysis process played important roles in producing peptone with high protein content and degree of hydrolysis, which contributed to better performance of the fish waste peptone in microbial growth. In conclusion, peptones produced from the mixture of sardine and mackerel waste are potentially viable to replace existing commercial peptone as microbial cultivation media.

关键词： Alcalase enzyme fish waste peptone degree of hydrolysis

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Determination of distribution coefficient: A critical Review

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International Journal of Environment and Waste Management 2014年第1期14卷 27-64页

作者： Pathak, Pankaj Singh, D.N. Pandit, G.G. Rakesh, R.R. Department of Civil Engineering Indian Institute of Technology Bombay Powai Mumbai-400076 India Environmental Monitoring and Assessment Section Environmental Assessment Division Bhabha Atomic Research Centre Trombay Mumbai-400 085 India Process Development Division Bhabha Atomic Research Centre Trombay Mumbai-400 085 India

Geomaterials (soils and rocks) exhibit peculiar physical, chemical, mineralogical and biological properties, which influence their interaction with the contaminant(s) to a great extent. This interaction can be quantified by employing a parameter 'Distribution coefficient', kd, which plays an important role for determining sorption and desorption characteristics of the contaminant when it interacts with geomaterial(s). Apart from the soil specific properties, kd depends upon the pH of the pore solution, ambient temperature, type and concentration of competitive ions, the presence of microorganisms, etc. Usually, batch, column and lysimetric tests are employed for determining kd. However, it has been observed that kd varies in a wide range and the methodologies adopted for its determination have their limitations and shortcomings. As such, these methodologies are being critically evaluated by researchers so that they may be modified or replaced by new ones, which are easy to adopt and yield reliable results quickly. With this in view, efforts have been made in this paper to highlight the importance and role of parameters that influence determination of kd. Further, details of the studies related to determination of kd as reported by earlier researchers and a commentary on the guidelines for determining it are also presented in this paper. Copyright.© 2014 Inderscience Enterprises Ltd.

关键词： Desorption

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Rheological Modelling of the Effects of Sucrose Adulterant on Nigerian Honey

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Nigerian Food Journal 2014年第2期32卷 103-112页

作者： V.O. Anidiobu Food Process Engineering Section Department of Food Technology The Federal Polytechnic Ado-Ekiti Nigeria. +234 8035 401 411

Rheology has been applied as sensitive tool for material characterisation since flow behaviour correlates closely with composition, molecular weight and molecular weight distribution. Pure honey was serially diluted with different percentages of sucrose: 10%, 50%, 70% and 90% and each were analysed rheologically at two different temperatures. Pure honey exhibits thixotropic time dependent rheological behaviour, while the behaviour of sucrose tends towards Newtonian. The addition of adulterant to honey drags the viscosity of the resulting fluid towards Newtonian. The rheological curve fitting was done using the Power Law and Carreau-Yasuda models. The results show that the Carreau-Yasuda model fitted better the rheology of pure honey samples. Conversely, the rheology of sucrose solution was predicted better with Power Law model.

关键词： Rheology honey Carreau-Yasuda model Power Law model sucrose adulteration

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