Measurement of hybridoma cell number, viability, and morphology using fully automated image analysis.

Abstract:

:A novel automated image analysis method is described for characterizing the viability and morphology of animal cells from suspension cultures. With the aid of the exclusion dye Trypan Blue, the total and viable cell counts and the percentage of dead cells present are found. The area, perimeter, equivalent diameter, and circularity of the projected image of each cell are also measured, allowing the estimation of cell volume. The image analysis method is inherently sensitive, precise, consistent (non-operator dependent) and relatively fast, taking approximately 22 min to analyze one sample. The data it gives on individual cellular activity, as characterized by Trypan Blue uptake and cell morphology, are valuable in allowing early diagnosis of even subtle changes in the health of a culture. The method should permit better optimization of culture conditions, and will provide data for the modeling of cell population dynamics. As the conventional manual method is operator dependent, relatively limited in the amount of information it provides, and has a tendency to underestimate Trypan Blue takeup, it is suggested that image analysis be the preferred option for animal cell counting and viability determinations.

journal_name

Enzyme Microb Technol

authors

Tucker KG,Chalder S,al-Rubeai M,Thomas CR

doi

10.1016/0141-0229(94)90106-6

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

29-35

issue

1

eissn

0141-0229

issn

1879-0909

pii

0141-0229(94)90106-6

journal_volume

16

pub_type

杂志文章
  • Characterization of two acidic β-glucosidases and ethanol fermentation in the brown rot fungus Fomitopsis palustris.

    abstract::Two acidic β-glucosidases (βGI and βGII) from the brown rot fungus Fomitopsis palustris were purified to homogeneity by several chromatographic steps. βGI and βGII had molecular weights of 130 and 213 kDa, respectively, and exhibited optimum activity at pH 2.5 and 55°C. The K(m) values of βGI and βGII for p-nitropheny...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2010.12.012

    authors: Okamoto K,Sugita Y,Nishikori N,Nitta Y,Yanase H

    更新日期:2011-04-07 00:00:00

  • Penicillin amidase-catalysed transfer of low specific acyl moiety. Synthesis of 7-benzoxazolonylacetamido desacetoxycephalosporanic acid.

    abstract::The methyl ester of 2-benzoxazolon-3-yl-acetic acid was used as an acyl donor in the penicillin amidase-catalysed transfer reaction to 7-aminodesacetoxycephalosporanic acid. The synthesis of 7-(2-benzoxazolon-3-yl-acetamido)-desacetoxycephalosporanic acid was carried out as a kinetically controlled reaction. A charact...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/0141-0229(92)90144-d

    authors: Stambolieva N,Mincheva Z,Galunsky B,Kalcheva V

    更新日期:1992-06-01 00:00:00

  • Efficient enzymatic synthesis of α-keto acids by redesigned substrate-binding pocket of the l-amino acid deaminase (PmiLAAD).

    abstract::In our previous study, we produced α-keto acids by using an L-amino acid deaminase PmiLAAD (wide-type) from Proteus mirabilis, however, the catalytic efficiency was low due to its low substrate affinity. In this study, protein engineering of PmiLAAD was performed to improve the α-keto acid production. PmiLAAD was engi...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2019.109393

    authors: Wu L,Guo X,Wu G,Liu P,Liu Z

    更新日期:2020-01-01 00:00:00

  • Enzymatic production of cephalexin.

    abstract::Enzymatic production of cephalexin using immobilized penicillin G acylase was studied. The factors that affect the conversion of 7-amino-3-deacetoxycephalosporanic acid (7-ADCA) to cephalexin, such as pH; temperature; concentrations of 7-ADCA, D(-)-phenylglycine methyl ester (PGME), and immobilized penicillin G acylas...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/0141-0229(94)90095-7

    authors: Maladkar NK

    更新日期:1994-08-01 00:00:00

  • Application of a novel type impinging streams reactor in solid-liquid enzyme reactions and modeling of residence time distribution using GDB model.

    abstract::Solid-liquid enzyme reactions constitute important processes in biochemical industries. The isomerization of d-glucose to d-fructose, using the immobilized glucose isomerase (Sweetzyme T), as a typical example of solid-liquid catalyzed reactions has been carried out in one stage and multi-stage novel type of impinging...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2013.11.006

    authors: Fatourehchi N,Sohrabi M,Dabir B,Royaee SJ,Haji Malayeri A

    更新日期:2014-02-05 00:00:00

  • Biochemical stability and molecular dynamic characterization of Aspergillus fumigatus cystathionine γ-lyase in response to various reaction effectors.

    abstract::Cystathionine γ-lyase (CGL) is a key enzyme in the methionine-cysteine cycle in all living organisms forming cysteine, α-ketobutyrate and ammonia via homocysteine and cystathionine intermediates. Although, human and plant CGLs have been extensively studied at the molecular and mechanistic levels, there has been little...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2015.08.004

    authors: El-Sayed AS,Abdel-Azeim S,Ibrahim HM,Yassin MA,Abdel-Ghany SE,Esener S,Ali GS

    更新日期:2015-12-01 00:00:00

  • Characterization of two truncated forms of xylanase recombinantly expressed by Lactobacillus reuteri with an introduced rumen fungal xylanase gene.

    abstract::The xylanase R8 gene (xynR8) from uncultured rumen fungi was cloned and successfully expressed in Lactobacillus reuteri. A xylanase activity of 132.1 U/mL was found in the broth of L. reuteri R8, the transformant containing pNZ3004 vector with xynR8 gene insertion. Two distinct forms of recombinant xylanase with diffe...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2014.06.004

    authors: Cheng HL,Hu CY,Lin SH,Wang JY,Liu JR,Chen YC

    更新日期:2014-10-01 00:00:00

  • Improved efficiency of a novel methyl parathion hydrolase using consensus approach.

    abstract::A methyl parathion hydrolase (MPH) gene, bjmpd, was cloned from a newly isolated MP-degrading bacterial strain, Burkholderia jiangsuensis MP-1T and heterologously expressed in Escherichia coli BL21 (DE3). Although the amino acid sequence of the bjmpd-encoded enzyme, named BjMPH, differed from that of MPH from Pseudomo...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2016.07.005

    authors: Liu XY,Chen FF,Li CX,Luo XJ,Chen Q,Bai YP,Xu JH

    更新日期:2016-11-01 00:00:00

  • Peptide synthesis in neat organic solvents with novel thermostable proteases.

    abstract::Biocatalytic peptide synthesis will benefit from enzymes that are active at low water levels in organic solvent compositions that allow good substrate and product solubility. To explore the use of proteases from thermophiles for peptide synthesis under such conditions, putative protease genes of the subtilase class we...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2015.03.003

    authors: Toplak A,Nuijens T,Quaedflieg PJ,Wu B,Janssen DB

    更新日期:2015-06-01 00:00:00

  • Protein nano-crystallogenesis.

    abstract::We demonstrate the feasibility of growing crystals of protein in volumes as small as 1 nanoliter. Advances in the handling of very small volumes (i.e. through inkjet and other technologies) open the way towards fully automated systems. The rationale for these experiments is the desire to develop a system that speeds u...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/s0141-0229(01)00496-3

    authors: Kuil ME,Bodenstaff ER,Hoedemaeker FJ,Abrahams JP

    更新日期:2002-03-13 00:00:00

  • Evaluation and modelling the utility of SCCO2 to support efficient lipase mediated esterification.

    abstract::Supercritical fluids offer environmental advantages over chemical solvents, while providing enhanced separation and chemical selectivity. The use of supercritical fluids for the recovery of products from biomass and the transformation of selected molecules (to add value) was studied. Free fatty acids were bio-catalyti...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2011.07.004

    authors: Baig MN,Santos RC,Zetzl C,King J,Pioch D,Bowra S

    更新日期:2011-09-10 00:00:00

  • Chaperon solvent plug design in size-exclusion chromatography protein refolding process.

    abstract::Although the chaperon solvent plug was reported as a strategy to reduce aggregation before the column inlet in SEC (size-exclusion chromatography) protein refolding process, the appropriate position at which sample injected and the volume of the chaperon solvent plug have not been elucidated. Therefore, the detail of ...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2011.05.003

    authors: Chen YC,Liu HS

    更新日期:2011-07-10 00:00:00

  • Novel glycosylated human interferon alpha 2b expressed in glycoengineered Pichia pastoris and its biological activity: N-linked glycoengineering approach.

    abstract::Human interferon alpha 2b (IFN α2b) is a type I interferon exhibiting antiviral, anti-proliferative and immunomodulatory activities. The clinical outcome of the approved recombinant human IFN α2b drugs in the market suffers from short plasma half-life, rapid clearance and other side effects. Human IFN α2b expression i...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2019.05.007

    authors: Katla S,Yoganand KNR,Hingane S,Ranjith Kumar CT,Anand B,Sivaprakasam S

    更新日期:2019-09-01 00:00:00

  • Synthesis of esters using a nylon-immobilized lipase in batch and continuous reactors.

    abstract::Direct esterifications using a nylon-immobilized lipase from Candida cylindracea were carried out in batch and continuous-flow reactors. The immobilized enzyme was effective in catalyzing the synthesis of ethylpropionate, isoamylpropionate, and isoamylbutyrate. With ethanol dissolved in hexane as a substrate, the maxi...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/0141-0229(92)90054-r

    authors: Carta G,Gainer JL,Gibson ME

    更新日期:1992-11-01 00:00:00

  • γ-Glutamyl transpeptidase from Bacillus pumilus KS 12: decoupling autoprocessing from catalysis and molecular characterization of N-terminal region.

    abstract::Gamma glutamyl transpeptidase from Bacillus pumilus KS12 (GGTBP) was cloned, expressed in pET-28-E. coli expression system as a heterodimeric enzyme with molecular weights of 45 and 20 kDa for large and small subunit, respectively. It was purified by nickel affinity chromatography with hydrolytic and transpeptidase ac...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2011.08.005

    authors: Murty NA,Tiwary E,Sharma R,Nair N,Gupta R

    更新日期:2012-03-10 00:00:00

  • Structural change in wood by brown rot fungi and effect on enzymatic hydrolysis.

    abstract::The effects of biological pretreatment on Pinus radiata and Eucalyptus globulus, were evaluated after exposure to two brown rot fungi Gloephylum trabeum and Laetoporeus sulphureus. Changes in chemical composition, structural modification, and susceptibility to enzymatic hydrolysis in the degraded wood were analyzed. A...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2011.08.004

    authors: Monrroy M,Ortega I,Ramírez M,Baeza J,Freer J

    更新日期:2011-10-10 00:00:00

  • Utilization of distillery wastewater for hydrogen production in one-stage and two-stage processes involving photofermentation.

    abstract::In this study, distillery wastewater was treated by dark fermentation or photofermentation alone, and by sequential dark and photofermentation processes using anaerobic saccharolytic consortium and purple nonsulfur bacteria. Combination of dark and photofermentation resulted in the maximal H2 yield of 17.6L/L of disti...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2017.11.009

    authors: Laurinavichene T,Tekucheva D,Laurinavichius K,Tsygankov A

    更新日期:2018-03-01 00:00:00

  • Trypsin inactivation by latex fabricated gold nanoparticles: A new strategy towards insect control.

    abstract::Before applying nanotechnologies in biomedical and environmental areas it is advised to study interactions of nanoparticles and other nanomaterials with biomacromolecule present in living system. Moreover there is scarcity of reports on interactions between nanoparticles and biomaterials. In present report a rapid, ec...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2016.06.005

    authors: Patil CD,Borase HP,Suryawanshi RK,Patil SV

    更新日期:2016-10-01 00:00:00

  • Amphiphilic hollow carbonaceous microsphere-encapsulated enzymes: Facile immobilization and robust biocatalytic properties.

    abstract::This study reports a general strategy for the encapsulation of various enzymes in amphiphilic hollow carbonaceous microspheres (CMs). We found that enzymes could be spontaneously encapsulated in the interior cavity of the CMs via hydrophobic interactions. Due to strong hydrophobic interactions and robust confinement, ...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2015.06.015

    authors: Liu L,Sun Y,He L,Jiang L,Yang S

    更新日期:2015-11-01 00:00:00

  • Whole-cell bio-oxidation of n-dodecane using the alkane hydroxylase system of P. putida GPo1 expressed in E. coli.

    abstract::The alkane-1-monoxygenase (alkB) complex of Pseudomonas putida GPo1 has been extensively studied in the past and shown to be capable of oxidising aliphatic C(5)-C(12) alkanes to primary alcohols both in the wild-type organism by growth on C(5)-C(12) alkanes as sole carbon source and in vitro. Despite this, successful ...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2011.01.008

    authors: Grant C,Woodley JM,Baganz F

    更新日期:2011-05-06 00:00:00

  • Identification of key sites determining the cofactor specificity and improvement of catalytic activity of a steroid 5β-reductase from Capsella rubella.

    abstract::Progesterone 5β-reductases (P5βRs) are involved in 5β-cardenolide formation by stereo-specific reduction of the △4,5 double bond of steroid precursors. In this study a steroid 5β-reductase was identified in Capsella rubella (CrSt5βR1) and its function in steroid 5β-reduction was validated experimentally. CrSt5βR1 is c...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2019.109483

    authors: Li Y,Pan H,Chang Y,Dong N,Zou L,Liang P,Tian W,Chang Z

    更新日期:2020-03-01 00:00:00

  • Chemical modification of lysine residues in Bacillus alpha-amylases: effect on activity and stability.

    abstract::Chemical modification of lysine residues in two bacterial alpha-amylases, a mesophilic enzyme from Bacillus amyloliquefaciens (BAA) and a thermophilic enzyme from Bacillus licheniformis (BLA) was carried out using citraconic anhydride. 13 +/- 1 residues in BAA and 10 +/- 1 residues in BLA were found modified under def...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/s0141-0229(01)00296-4

    authors: Khajeh K,Naderi-Manesh H,Ranjbar B,Moosavi-Movahedi A,Nemat-Gorgani M

    更新日期:2001-04-05 00:00:00

  • Salt inhibition kinetics in nitrification of synthetic saline wastewater.

    abstract::Nitrification kinetics of synthetic saline wastewater was investigated by using an activated sludge unit. Initial experiments were performed with salt-free wastewater to obtain baseline information. Experiments with 3% salt concentration were performed at different sludge ages in order to investigate the system perfor...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/s0141-0229(01)00312-x

    authors: Dinçer AR,Kargi F

    更新日期:2001-05-07 00:00:00

  • Functional evaluation of residues in the herbicide-binding site of Mycobacterium tuberculosis acetohydroxyacid synthase by site-directed mutagenesis.

    abstract::Mycobacterium tuberculosis acetohydroxyacid synthase (M. tuberculosis AHAS) has been proposed to bean essential target for novel herbicide- and chemical-based antibacterial agents. Therefore, here we investigated the roles of multiple conserved herbicide-binding site residues (R318, A146, Q148, M512, and V513) in M. t...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2015.06.009

    authors: Jung IP,Cho JH,Koo BS,Yoon MY

    更新日期:2015-10-01 00:00:00

  • Enhancement of neuroprotection, antioxidant capacity, and water-solubility of crocins by transglucosylation using dextransucrase under high hydrostatic pressure.

    abstract::Crocin, one of the major carotenoid pigments of Crocus sativus (saffron), is responsible for antioxidant activity, neuroprotection, and the inhibition of tumor cell proliferation. In order to improve the functionality of crocin, α-glucosyl-(1→6)-trans-crocins (C-Gs) were synthesized using sucrose and dextransucrase fr...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2020.109630

    authors: Mok IK,Nguyen TTH,Kim DH,Lee JW,Lim S,Jung HY,Lim T,Pal K,Kim D

    更新日期:2020-10-01 00:00:00

  • Modulatory effect of low-shear modeled microgravity on stress resistance, membrane lipid composition, virulence, and relevant gene expression in the food-borne pathogen Listeria monocytogenes.

    abstract::The present study investigated the influence of low-shear modeled microgravity (LSMMG) conditions on Listeria monocytogenes stress response (heat, cold, and acid), membrane fatty acid composition, and virulence potential as well as stress-/virulence-associated gene expression. The results showed that LSMMG-cultivated ...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2019.109440

    authors: Sheet S,Yesupatham S,Ghosh K,Choi MS,Shim KS,Lee YS

    更新日期:2020-02-01 00:00:00

  • Porous biochar/chitosan composites for high performance cellulase immobilization by glutaraldehyde.

    abstract::In this work, porous biochar derived from sugarcane bagasse was prepared and then coated with different amounts of chitosan (C@CS) for cellulase immobilization. Cellulase was covalently immobilized on the support by using glutaraldehyde as a linker. The chemical characteristics and morphology of the samples were deter...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2020.109561

    authors: Mo H,Qiu J,Yang C,Zang L,Sakai E,Chen J

    更新日期:2020-08-01 00:00:00

  • An improved amperometric L-lactate biosensor based on covalent immobilization of microbial lactate oxidase onto carboxylated multiwalled carbon nanotubes/copper nanoparticles/polyaniline modified pencil graphite electrode.

    abstract::An improved amperometric l-lactate biosensor was constructed based on covalent immobilization of lactate oxidase (LOx) from Pediococcus species onto carboxylated multiwalled carbon nanotubes (cMWCNT)/copper nanoparticles (CuNPs)/polyaniline (PANI) hybrid film electrodeposited on the surface of a pencil graphite electr...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2016.10.014

    authors: Dagar K,Pundir CS

    更新日期:2017-01-01 00:00:00

  • Deglycosylation patterns of isoflavones in soybean extracts inoculated with two enzymatically different strains of lactobacillus species.

    abstract::Microorganism selection is critical to deglycosylation in soybean fermentation for producing beneficial phytochemicals. This study investigated isoflavone bioconversion in soybean extract inoculated with Lactobacillus plantarum K2-12 and Lactobacillus curvatus JD0-31 exhibiting different enzyme activities. L. plantaru...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/j.enzmictec.2019.109394

    authors: Lim YJ,Lim B,Kim HY,Kwon SJ,Eom SH

    更新日期:2020-01-01 00:00:00

  • Preparation of high activity whole cell biocatalyst by permeabilization of recombinant flocculent yeast with alcohol.

    abstract::Flocculent yeast Saccharomyces cerevisiae YF234 (MATa ura3-52 trp1Delta2 his ade 2-1 can1-100 sta1 FLO8) cells overexpressing glyoxalase I and having strong flocculation ability were permeabilized with isopropyl alcohol and ethanol under various conditions. The treatment with 40% isopropyl alcohol significantly improv...

    journal_title:Enzyme and microbial technology

    pub_type: 杂志文章

    doi:10.1016/s0141-0229(00)00304-5

    authors: Kondo A,Liu Y,Furuta M,Fujita Y,Matsumoto T,Fukuda H

    更新日期:2000-12-01 00:00:00