Abstract:
:Monitoring cell growth is crucial to the success of an animal cell culture process that can be accomplished by a variety of direct or indirect methodologies. Glucose is a major carbon and energy source for cultured mammalian cells in most cases, but glycolytic metabolism often results in the accumulation of lactate. Glucose and lactate levels are therefore routinely measured to determine metabolic activities of a culture. Typically, neither glucose consumption rate nor lactate accumulation rate has a direct correlation with cell density due to the changes in culture environment and cell physiology. We discovered that although the metabolic rate of glucose or lactate varies depending on the stages of a culture, the cumulative consumption of glucose and lactate combined (Q(GL)) exhibits a linear relationship relative to the integral of viable cells (IVC), with the slope indicating the specific consumption rate of glucose and lactate combined (q(GL)). Additional studies also showed that the q(GL) remains relatively constant under different culture conditions. The insensitivity of the q(GL) to process variations allows a potentially easy and accurate determination of viable cell density by the measurement of glucose and lactate. In addition, the more predictable nature of a linear relationship will aid the design of better forward control strategies to improve cell culture processes.
journal_name
J Biotechnoljournal_title
Journal of biotechnologyauthors
Tsao YS,Cardoso AG,Condon RG,Voloch M,Lio P,Lagos JC,Kearns BG,Liu Zdoi
10.1016/j.jbiotec.2005.05.016subject
Has Abstractpub_date
2005-08-22 00:00:00pages
316-27issue
3eissn
0168-1656issn
1873-4863pii
S0168-1656(05)00241-5journal_volume
118pub_type
杂志文章abstract::We report here the complete genome sequence of Citrobacter amalonaticus Y19 isolated from an anaerobic digester. PacBio single-molecule real-time (SMRT) sequencing was employed, resulting in a single scaffold of 5.58Mb. The sequence of a mega plasmid of 291Kb size is also presented. ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2015.07.012
更新日期:2015-10-10 00:00:00
abstract::Fermented Monascus pigments have been utilized as traditional Chinese medicine and food colorant for thousands of years. Under the limited nitrogen concentration and/or low initial pH 2.5 conditions, it was observed that production of intracellular pigments and accumulation of microbial lipids (high content reaching t...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2015.08.019
更新日期:2015-10-20 00:00:00
abstract::To improve enzymatic activity of Bacillus pumilus lipases, DNA shuffling was applied to two lipase genes from local B. pumilus isolates. Using a high-throughput activity assay, the mutant with highest activity was selected. This chimeric mutant (L3-3), carrying two crossover positions and three point mutations, has a ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.12.016
更新日期:2013-03-10 00:00:00
abstract::Specific delivery of TNF-α antagonist to the inflamed site can increase its efficacy and reduce the side effects. In this study, we constructed a bispecific diabody (BsDb) that targets TNF-α and ED-B-containing fibronectin (B-FN), a fibronectin isoform specifically expressed in the pannus of the inflamed joint in rheu...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.06.017
更新日期:2014-09-30 00:00:00
abstract::We have reported that nanowell array (NWA) can enhance electrochemical detection of molecular binding events by controlling the binding sites of the captured molecules. Using NWA biosensor based amperometric analysis, we have detected biological macromolecules such as DNA, protein or aptamers at low concentrations. In...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.08.029
更新日期:2013-12-01 00:00:00
abstract::Anaerobic co-digestion using protein-rich and lipid-rich co-substrates is limited by the accumulation of ammonia and long chain fatty acids (LCFAs), which are important inhibitors of the anaerobic microorganisms. This work aimed to study the microbial community dynamics during gradual and abrupt increase in ammonium a...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2016.01.006
更新日期:2016-02-20 00:00:00
abstract::Cupriavidus nantongensis X1 is a chlorpyrifos degrading bacterium, which was isolated from sludge collected at the drain outlet of a chlorpyrifos manufacture plant. It is the first time to report the complete genome sequence of C. nantongensis species, which has been reported as a novel species of Cupriavidus genus. I...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2016.04.012
更新日期:2016-06-10 00:00:00
abstract::The genus Enterococcus occurs as native microbiota of fermented products due to its broad environmental distribution and its resistance to salt concentrations. Enterococcus faecalis F, a non-pathogenic strain isolated from a ripened cheese, has demonstrated useful enzymatic capabilities, a probiotic behavior and antib...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2018.06.346
更新日期:2018-10-10 00:00:00
abstract::The energy which simple-stomached livestock can derive from dietary plant material is limited by the lack of plant polysaccharide degrading enzymes in their gastro-intestinal (GI) tract and the inefficient microbial fermentation of such material in their hind-gut. In poultry the non-starch polysaccharides found in cer...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(99)00098-x
更新日期:1999-06-11 00:00:00
abstract::The increasing demand of monoclonal antibodies for therapeutic applications along with the high manufacturing cost have made it necessary to evaluate better process options and technologies for their purification. Affinity precipitation is an attractive alternative to traditional chromatographic methods by affording e...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.10.007
更新日期:2013-01-10 00:00:00
abstract::We established a novel method to analyze the gene expression of prokaryotes by modifying and optimizing the HiCEP (high coverage gene expression analysis) method, which was originally developed for eukaryotic gene expression profiling. Following the removal of abundant rRNA, the mRNA of prokaryotic cells was enzymatic...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.11.004
更新日期:2006-05-29 00:00:00
abstract::The transfer of genetic information between distantly or even unrelated organisms during evolution had been inferred from nucleotide sequence comparisons. These studies provided circumstantial evidence that in rare cases genes had been laterally transmitted amongst organisms of the domains bacteria, archaea and eukary...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/s0168-1656(98)00105-9
更新日期:1998-09-17 00:00:00
abstract::Often, degradability under anaerobic conditions is desirable for plastics claimed to be biodegradable, e.g. in anaerobic biowaste treatment plants, landfills and in natural anaerobic sediments. The biodegradation of the natural polyesters poly(beta-hydroxybutyrate) (PHB), poly(beta-hydroxybutyrate-co-11.6%-beta-hydrox...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(00)00406-5
更新日期:2001-03-30 00:00:00
abstract::Artificial microRNA (amiRNA) technology has been applied in Arabidopsis thaliana and other plants to efficiently silence target genes of interest. Here we described a novel approach to construct plant amiRNA expression vectors with seamless enzyme-free cloning (SEFC) and mating-assisted genetically integrated cloning ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2010.10.078
更新日期:2011-01-10 00:00:00
abstract::Ubiquitination is one of the most significant posttranslational modifications (PTMs). To evaluate the ability of an insect cell-free protein synthesis system to carry out ubiquitin (Ub) conjugation to in vitro translated proteins, poly-Ub chain formation was studied in an insect cell-free protein synthesis system. Pol...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.10.009
更新日期:2010-01-01 00:00:00
abstract::A Pseudomonas aeruginosa biofilm is studied with pulsed field gradient echo nuclear magnetic resonance. Although not all spectral components are assigned yet, the experimental results show that a biofilm consists of components with very different diffusion coefficients. The various biofilm components that give motiona...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(99)00213-8
更新日期:2000-01-28 00:00:00
abstract::Harbour sediments are periodically subjected to dredging operations and their management is mainly based on the assessment of the chemical contamination levels, but the potential risks posed by the presence of pathogenic microorganisms have been largely neglected. Here we first developed new molecular protocols based ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2011.07.033
更新日期:2012-02-20 00:00:00
abstract::The Pol6 mutant of Penicillium occitanis, secreting a large quantity of cellulases, was cultivated in fermentor using a local paper pulp as an inducer substrate. A high titer of extracellular cellulase activity was reached after a fed batch process: 23 IU x ml(-1) filter paper activity, 21 IU x ml(-1) CMCases activity...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(01)00309-1
更新日期:2001-08-23 00:00:00
abstract::Paramagnetic carriers, which are linked to antibodies enable highly specific biological cell separations. With the colloidal synthesis of superparamagnetic Co and FeCo nanocrystals with superior magnetic moments the question about their potential to replace magnetite as the magnetically responsive component of magneti...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2004.04.019
更新日期:2004-08-26 00:00:00
abstract::The aim of this study was to investigate the effect of micronization on the compound content, crystalline structure and physicochemical properties of fiber from genetically modified (GM) flax. The GM flax was transformed with three bacterial (Ralstonia eutropha) genes coding for enzymes of polyhydroxybutyrate (PHB) sy...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.01.002
更新日期:2012-12-15 00:00:00
abstract::One potential reason for the enhancement of immune responses to DNA vaccines following electroporation is increased gene expression. However, the inflammatory response and accompanying cellular infiltration stimulated by electroporation may also be essential for enhancing immune responses to DNA vaccines. These parame...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2004.01.015
更新日期:2004-05-13 00:00:00
abstract::Myostatin (MSTN), a member of transforming growth factor-beta superfamily is a negative regulator of the skeletal muscle growth. It suppresses the proliferation and differentiation of myoblast cells. Dysfunction of MSTN gene either by natural mutation or induced through genetic manipulation (knockout or knockdown) has...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.10.017
更新日期:2010-01-15 00:00:00
abstract::A gene circuit for the controlled expression of a marker gene and for the assay of xylose concentration in Escherichia coli has been designed and tested. The xylF coding sequence for the xylose binding protein (XBP) was cloned in pT7T318U downstream from the promoter for xylanase A from B. subtilis (Pbsu), together wi...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.10.019
更新日期:2013-12-01 00:00:00
abstract::The feed profile of glucose during fedbatch cultivation could be used to influence the retention of the periplasmic product ZZ-cutinase. An increased feed rate led to a higher production rate but also to an increased specific leakage, which reduced the periplasmic retention. Three growth rates: 0.3, 0.2 and 0.1 h(-1) ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.05.002
更新日期:2008-07-31 00:00:00
abstract::The synthesis of galactooligosaccharides (GOS) by whole cells of Bifidobacterium bifidum NCIMB 41171 was investigated by developing a set of mathematical models. These were second order polynomial equations, which described responses related to the production of GOS constituents, the selectivity of lactose conversion ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2010.08.008
更新日期:2010-10-01 00:00:00
abstract::Overcoming the effects of hydrolysate toxicity towards ethanologens is a key technical barrier in the biochemical conversion process for biomass feedstocks to ethanol. Despite its importance, the complexity of the hydrolysate toxicity phenomena and the lack of systematic studies, analysis and tools surrounding this is...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.08.006
更新日期:2009-12-01 00:00:00
abstract::Proteolytically cleaved human 22 kDa growth hormone (22K hGH) between the amino acid residues 134 and 150 by plasmin or other proteases in vitro has been reported to be most active in growth promoting activity. In this study a deleted mutant hGH lacking amino acid residues from 135 to 146 and having more sensitivity t...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(99)00234-5
更新日期:2000-02-28 00:00:00
abstract::The miniaturization of analytical devices by micromachining technology is destined to have a major impact on medical and bioanalytical fields. To meet the current demands for rapid DNA amplification, various instruments and innovative technologies have been introduced by several groups in recent years. The development...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/s1389-0352(01)00033-2
更新日期:2001-12-01 00:00:00
abstract::A fibrous-bed bioreactor containing the coculture of Pseudomonas putida and P. fluorescens immobilized in a fibrous matrix was developed to degrade benzene (B), toluene (T), ethylbenzene (E), and o-xylene (X) in synthetic waste streams. The kinetics of BTEX biodegradation by immobilized cells adapted in the fibrous-be...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(98)00166-7
更新日期:1999-01-22 00:00:00
abstract::The unsaturations and groups bound to the ring and to the lateral chain of lactones give a large diversity in this class of molecules. In this work we produced enzymatically a macrolactone in organic media. The substrate used was a hydroxy-fatty acid: (+)-coriolic acid and the enzymes tested were free or immobilized m...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(01)00374-1
更新日期:2002-01-18 00:00:00