keyword
MENU ▼
Read by QxMD icon Read
search

fermentor

keyword
https://www.readbyqxmd.com/read/28710630/scale-up-of-phytosterols-bioconversion-into-androstenedione
#1
Sonia Martínez-Cámara, Esther Bahíllo, José-Luis Barredo, Marta Rodríguez-Sáiz
Phytosterols, generated as a by-product of vegetable oils or wood pulp, contain the cyclopentane-perhydro-phenanthrene nucleus, and can be converted into steroid intermediates by removing the C17 side chain. This chapter shows the scale-up, from flask to fermentor, of the phytosterols bioconversion into 4-androstene-3,17-dione (androstenedione; AD) with Mycobacterium neoaurum B-3805. Due to the fact that phytosterols and AD are nearly insoluble in water, two-phase systems and the use of chemically modified cyclodextrins have been described as methods to solve it...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28708454/improving-the-production-of-s-adenosyl-l-methionine-in-escherichia-coli-by-overexpressing-metk
#2
Ping Yu, Pengzhi Zhu
S-adenosyl-L-methionine (SAM) has important applications in many fields including the chemical therapy and the pharmaceutical industry. In this study, the recombinant Escherichia coli strain was constructed for effective production of SAM by introducing the SAM synthase gene (metK). This strain produced 34.5 mg/l of SAM in basic medium in shake flask. Yeast extract, pH and loaded volume had a significant positive effect on the yield of SAM. Their optimal values were 35 g/l, 7.5 and 30 ml, respectively...
July 14, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28667643/upscale-production-of-a-recombinant-cyclodextrin-glycosyltransferase-from-paenibacillus-macerans-in-escherichia-coli
#3
Yi-Nan Yang, Wen-Xin Shan, Pi-Wu Wang
Cyclodextrin glucanotransferase (CGTase) is an important enzyme with multiple functions in starch utilization. In the present study, a fermentation process for the production of CGTase from Escherichia coli harboring the recombinant plasmid pET28b(+)-CGTase was investigated and optimized. The optimal fermentation and expression conditions were 10.0 g/L glycerol, 20.0 g/L tryptone, and 10.0 g/L yeast extract with an initial pH of 7.0, an IPTG concentration of 0.1 mM and an induction temperature of 28 °C for 10 h...
July 2017: 3 Biotech
https://www.readbyqxmd.com/read/28656630/deleting-the-first-disulfide-bond-in-a-arenicin-derivative-enhances-its-expression-in-pichia-pastoris
#4
Na Yang, Xiumin Wang, Da Teng, Ruoyu Mao, Ya Hao, Xingjun Feng, Jianhua Wang
The marine antimicrobial peptide NZ17074, a variant of arenicin-3 from Arenicola marina that has broad anti-antimicrobial activity and high bioavailability, can be designed to treat bacterial and fungal diseases. To reduce the toxicity of NZ17074, N6 was designed by replacing a cysteine in positions 3 and 20 with alanine, fused to the C-terminus of the small ubiquitin-like modifier tag (SUMO), and expressed in yeast. SUMO-N6 yielded as much as 921 mg l(-1) at 72 h after induction in a fermentor and increased 1...
June 28, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28616451/dataset-on-potential-large-scale-production-of-biosurfactant-using-bacillus-sp
#5
Hesty Heryani, Meilana Dharma Putra
Surfactants are very important in industry. The cost of commercial surfactant production is still high and the surfactant demand is constantly increasing. Microbial production of surfactant known as biosurfactant shows commercial potency. Utilization of Bacillus sp. strain on glucose fermentation for biosurfactant production was then studied. This type of microbe was isolated from soil contaminated with palm oil. The selection of the strain was based on its ability to form emulsifying zone around the colony and its capability to grow compared with those for commercial bacteria of Bacillus pumilus JCM 2508...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28612265/regular-enzyme-recovery-enhances-cellulase-production-by-trichoderma-reesei-in-fed-batch-culture
#6
Bucheng Wang, Lu Jiang, Hechao Bai, Qiang Yong, Shiyuan Yu
OBJECTIVE: To protect the enzymes during fed-batch cellulase production by means of partial enzyme recovery at regular intervals. RESULTS: Extracellular enzymes were partially recovered at the intervals of 1, 2, or 3 days. Mycelia were also removed to avoid contamination. Increases in the total harvested cellulase (24-62%) and β-glucosidase (22-76%) were achieved. In fermentor cultivation when the enzymes were recovered every day with 15% culture broth. The total harvested cellulase and β-glucosidase activity increased by 43 and 58%, respectively, with fungal cell concentration maintained at 3...
June 13, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28608479/biosynthesis-of-novel-7-8-dihydroxyflavone-glycoside-derivatives-and-in-silico-study-of-their-effects-on-bace1-inhibition
#7
Ramesh Prasad Pandey, Prakash Parajuli, Anaya Raj Pokhrel, Jae Kyung Sohng
7,8-Dihydroxyflavone (7,8-DHF) has been conjugated with glucose moiety to produce glucoside derivatives. Three analogues of 7,8-DHF (7-O-β-d-glucosyl-8-hydroxyflavone, 7-hydroxy-8-O-β-d-glucosyl flavone, and 7,8-di-O-β-d-glucosylflavone) have been successfully produced from in vitro reaction using glycosyltransferase of Bacillus licheniformis. Production of these 7,8-DHF derivatives were shifted to cheaper and easier approach in this study by using engineered Escherichia coli BL21 (DE3) ΔpgiΔzwfΔushA cells in which the flow of glucose-6-phospahte toward glycolysis and pentose phosphate pathway and hydrolysis of UDP-α-d-glucose were blocked while directing the carbon flux toward UDP-α-d-glucose by overexpressing UDP-α-d-glucose pathway genes...
June 12, 2017: Biotechnology and Applied Biochemistry
https://www.readbyqxmd.com/read/28593603/optimization-of-inexpensive-agricultural-by-products-as-raw-materials-for-bacitracin-production-in-bacillus-licheniformis-dw2
#8
Qin Wang, Hui Zheng, Xia Wan, Hongfeng Huang, Junhui Li, Christopher T Nomura, Changjun Wang, Shouwen Chen
Bacitracin is a broad-spectrum antibiotic used extensively as a feed additive. In this study, inexpensive agricultural by-products were used as nitrogen sources for bacitracin production. Based on both the orthogonal tests, a combination of 7% soybean meal (SBM) +2% low protein rapeseed cake (LPRC) was optimal for bacitracin production. Compared to the original formula, the titer of bacitracin increased by 20.5% reaching 910.4 U/ml in flasks. The titer of bacitracin and the ratio of bacitracin A increased by 12...
June 7, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28548573/inulin-type-fructan-degradation-capacity-of-clostridium-cluster-iv-and-xiva-butyrate-producing-colon-bacteria-and-their-associated-metabolic-outcomes
#9
F Moens, L De Vuyst
Four selected butyrate-producing colon bacterial strains belonging to Clostridium cluster IV (Butyricicoccus pullicaecorum DSM 23266(T) and Faecalibacterium prausnitzii DSM 17677(T)) and XIVa (Eubacterium hallii DSM 17630 and Eubacterium rectale CIP 105953(T)) were studied as to their capacity to degrade inulin-type fructans and concomitant metabolite production. Cultivation of these strains was performed in bottles and fermentors containing a modified medium for colon bacteria, including acetate, supplemented with either fructose, oligofructose, or inulin as the sole energy source...
May 30, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28484256/improved-thermostability-of-an-acidic-xylanase-from-aspergillus-sulphureus-by-combined-disulphide-bridge-introduction-and-proline-residue-substitution
#10
Wenhan Yang, Yongzhi Yang, Lingdi Zhang, Hang Xu, Xiaojing Guo, Xu Yang, Bing Dong, Yunhe Cao
As a feed additive, xylanase has been widely applied in the feed of monogastric animals, which contains multiple plant polysaccharides. However, during feed manufacture, the high pelleting temperatures challenge wild-type xylanases. The aim of this study was to improve the thermostability of Aspergillus sulphureus acidic xylanase. According to the predicted protein structure, a series of disulphide bridges and proline substitutions were created in the xylanase by PCR, and the mutants were expressed in Pichia pastoris...
May 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28456470/simple-and-rapid-method-for-isolation-and-quantitation-of-polyhydroxyalkanoate-by-sds-sonication-treatment
#11
Hisashi Arikawa, Shunsuke Sato, Tetsuya Fujiki, Keiji Matsumoto
We developed a new method for isolation and quantitation of polyhydroxyalkanoate (PHA) from culture broth. In this method, the cells were sonicated in sodium dodecyl sulfate (SDS) solution and centrifuged to recover PHA. The recovered PHA was rinsed with deionized water and ethanol, and then weighed after drying. Hazardous chemicals such as chloroform, methanol, and sulfuric acid were not used, and no expensive analytical instruments were needed. We applied this method to Cupriavidus necator culture broths that included various amounts of poly(3-hydroxybutyrate) (PHB) or poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) from flasks and jar fermentors...
April 26, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28456412/association-of-aqueous-hydrogen-concentration-with-methane-production-in-continuous-cultures-modulated-to-vary-ph-and-solids-passage-rate
#12
B A Wenner, J de Souza, F Batistel, T J Hackmann, Z Yu, J L Firkins
The objective of this study was to evaluate the effects of altering pH and solids passage rate (kp) on concentration of aqueous H2 [H2(aq)], CH4 production, volatile fatty acids (VFA) production, and fiber digestibility in a continuous culture fermentation system. The present study was conducted as a 2 × 2 factorial treatment arrangement in a Latin square design using continuous culture fermentors (n = 4). Our continuous culture system was converted to a closed system to measure CH4 and H2 emission while measuring H2(aq) concentration and VFA production for complete stoichiometric assessment of fermentation pattern...
July 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28456405/effects-of-replacing-soybean-meal-with-canola-meal-differing-in-rumen-undegradable-protein-content-on-ruminal-fermentation-and-gas-production-kinetics-using-2-in-vitro-systems
#13
E M Paula, H F Monteiro, L G Silva, P D B Benedeti, J L P Daniel, T Shenkoru, G A Broderick, A P Faciola
Previous research indicated that there were significant differences in rumen-undegradable protein (RUP) among canola meals (CM), which could influence the nutritional value of CM. The objectives of this study were to (1) evaluate the effects of feeding CM with different RUP contents on ruminal fermentation, nutrient digestion, and microbial growth using a dual-flow continuous culture system (experiment 1) and (2) evaluate ruminal gas production kinetics, in vitro organic matter (OM) digestibility, and methane (CH4) production of soybean meal (SBM) and CM with low or high RUP in the diet or as a sole ingredient using a gas production system (experiments 2 and 3)...
July 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28396694/synthesis-of-umbelliferone-derivatives-in-escherichia-coli-and-their-biological-activities
#14
Luan Luong Chu, Ramesh Prasad Pandey, Haet Nim Lim, Hye Jin Jung, Nguyen Huy Thuan, Tae-Su Kim, Jae Kyung Sohng
BACKGROUND: Umbelliferone, also known as 7-hydroxycoumarin, is a phenolic metabolite found in many familiar plants. Its derivatives have been shown to have various pharmacological and chemo-preventive effects on human health. A uridine diphosphate glycosyltransferase YjiC from Bacillus licheniformis DSM 13, a cytochrome P450BM3 (CYP450 BM3) variant namely mutant 13 (M13) from Bacillus megaterium, and an O-methyltransferase from Streptomyces avermitilis (SaOMT2) were used for modifications of umbelliferone...
2017: Journal of Biological Engineering
https://www.readbyqxmd.com/read/28372242/green-synthesis-of-isomaltulose-from-cane-molasses-by-bacillus-subtilis-wb800-pha01-pali-in-a-biologic-membrane-reactor
#15
Lingtian Wu, Shanshan Wu, Juanjuan Qiu, Chuanxue Xu, Sha Li, Hong Xu
A green process and environmentally benign process is highly desirable in the development of enzymatic catalysis. In this work, the shuttle plasmid pHA01 was constructed and the sucrose isomerase (SIase) was expressed in Bacillus subtilis WB800. The optimal nitrogen and carbon sources for SIase expression were yeast extract (15g/L) and un-pretreated cane molasses (UCM, 20g/L), respectively. After the UCM fed, the whole cell activity reached 5.2U/mL in a 7.5L fermentor. Optimum catalytic temperature and pH of whole cell were 35°C and 5...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28369693/a-bicistronic-vector-with-destabilized-mrna-secondary-structure-yields-scalable-higher-titer-expression-of-human-neurturin-in-e-coli
#16
Varnika Roy, Robert Roth, Mark Berge, Rajesh Chitta, Sucheta Vajrala, Srilatha Kuntumalla, Albert E Schmelzer, Ron Schoner
Human neurturin (NTN) is a cystine knot growth factor with potential therapeutic use in diseases such as Parkinson's and diabetes. Scalable high titer production of native NTN is particularly challenging because of the cystine knot structure which consists of an embedded ring comprised of at least three disulfide bonds. We sought to pursue enhanced scalable production of NTN in Escherichia coli. Our initial efforts focused on codon optimization of the first two codons following AUG, but these studies resulted in only a marginal increase in NTN expression...
March 28, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28365855/bioconversion-of-welan-gum-from-kitchen-waste-by-a-two-step-enzymatic-hydrolysis-pretreatment
#17
Panyu Li, Yi Xie, Yu Zeng, Wanrong Hu, Yan Kang, Xiang Li, Yabo Wang, Tonghui Xie, Yongkui Zhang
Kitchen waste (KW) is a worldwide issue, which can lead to environment pollution. Nevertheless, it is also a low-cost and sustainable resource for bio-production. Meanwhile, welan gum (WG) is one kind of the most important exopolysaccharide but with high material cost. The aim of this study was to adopt two-step enzymatic hydrolysis to improve the release and recovery of both sugar and protein in KW for subsequent WG production. As the results, the recovery rates of sugar and protein reached 81.07 and 77.38%, which were both satisfactory...
April 1, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28365562/responses-of-mixed-methanotrophic-consortia-to-variable-cu-2-fe-2-ratios
#18
Karthigeyan Chidambarampadmavathy, Obulisamy Parthiba Karthikeyan, Roger Huerlimann, Gregory E Maes, Kirsten Heimann
Methane mitigation in landfill top cover soils is mediated by methanotrophs whose optimal methane (CH4) oxidation capacity is governed by environmental and complex microbial community interactions. Optimization of CH4 remediating bio-filters need to take microbial responses into account. Divalent copper (Cu(2+)) and iron (Fe(2+)) are present in landfills at variable ratios and play a vital role in methane oxidation capacity and growth of methanotrophs. This study, as a first of its kind, therefore quantified effects of variable Cu(2+) and Fe(2+) (5:5, 5:25 and 5:50 μM) ratios on mixed methanotrophic communities enriched from landfill top cover (LB) and compost soils (CB)...
March 30, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28348799/community-acquired-urinary-tract-infections-caused-by-burkholderiacepacia-complex-in-patients-with-no-underlying-risk-factor
#19
Laila Nimri, Mamuno Sulaiman, Osama Bani Hani
Introduction. Urinary tract infections (UTIs) remain common infections diagnosed in outpatients as well as hospitalized patients. Community-acquired UTIs are generally caused by Escherichia coli and other members of the family Enterobacteriaceae.Burkholderiacepacia is an opportunistic pathogen mainly affecting immunocompromised and hospitalized patients, particularly those who have received prior broad-spectrum antibacterial therapy. Case presentation. Urine samples were collected from 157 outpatients clinically diagnosed with UTI and from 100 healthy control subjects...
January 2017: JMM Case Reports
https://www.readbyqxmd.com/read/28330311/scaling-up-a-virginiamycin-production-by-a-high-yield-streptomyces-virginiae-vkm-ac-2738d-strain-using-adsorbing-resin-addition-and-fed-batch-fermentation-under-controlled-conditions
#20
Vakhtang Dzhavakhiya, Vyacheslav Savushkin, Alexander Ovchinnikov, Vladislav Glagolev, Veronika Savelyeva, Evgeniya Popova, Nikita Novak, Elena Glagoleva
Virginiamycin produced by Streptomyces virginiae as a natural mix of macrocyclic peptidolactones M and S is widely used in the industrial production of ethanol fuel and as an antibiotic feed additive for cattle and poultry. Its main antimicrobial components, M1 and S1 factors, act synergistically if the M1:S1 ratio in the final product is 70-75:25-30. This fact significantly complicates the development of stable high-yield strains suitable for industrial application. In the previous work, authors obtained a mutant S...
December 2016: 3 Biotech
keyword
keyword
17748
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"