Shop All Competent Cells

One Shot™ TOP10 Chemically Competent E. coli Invitrogen™

One Shot® TOP10 Chemically Competent E. coli are provided at a transformation efficiency of 1 x 109 cfu/µg plasmid DNA and are ideal for high-efficiency cloning and plasmid propagation. They allow stable replication of high-copy number plasmids and are the same competent cells that come with many of our cloning kits. One Shot® TOP10 cells:

• Maximize cloning efficiency in a single-tube format
• Provide enhanced genomic DNA cloning capabilities

Easy-to-use One Shot® format
The single-tube, single-use format allows for all steps of the transformation protocol, up to plating, to take place in the same tube, thereby helping to save time and to prevent contamination.

Versatile cloning capabilities
One Shot® TOP10 E. coli cells are similar to the DH10B™ strain, and offer the following features:

• hsdR for efficient transformation of unmethylated DNA from PCR amplifications
• mcrA for efficient transformation of methylated DNA from genomic preparations
• lacZΔM15 for blue/white color screening of recombinant clones
• endA1 for cleaner DNA preparations and better results in downstream applications due to elimination of nonspecific digestion by Endonuclease I
• recA1 for reduced occurrence of nonspecific recombination in cloned DNA

Genotype: F- mcrA Δ( mrr-hsdRMS-mcrBC) Φ80lacZΔM15 Δ lacX74 recA1 araD139 Δ( araleu)7697 galU galK rpsL (StrR) endA1 nupG

Find the strain and format that you need
We also offer many other different strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require high-throughput transformation, choose from our collection of MultiShot™ formatted comp cells.

Tali™ Cell Cycle Kit Invitrogen™

The Tali® Cell Cycle Kit includes a ready-to-use reagent that, when used with the Tali® Image-Based Cytometer, provides a convenient and accurate determination of the percentage of cells in each phase of the cell cycle. This single-addition reagent is composed of propidium iodide (PI), RNase A, and Triton X-100.

The Tali® Cell Cycle Kit offers a simple workflow:

• The pre-mixed reagent can be stored at room temperature and used when your cells are ready
• Simply fix your cells, add the reagent, incubate, and visualize
• Cell cycle data can be analyzed on the Tali® instrument or exported as a .csv or .fcs file for analysis with various modeling software

Fluorescent detection of cellular DNA as a cell-cycle phase indicator
PI, a red fluorescent dye, binds to DNA by intercalating between the bases with the little or no sequence preference. Consequently, the degree of fluorescence is proportional to the amount of cellular DNA, which itself is indicative of cell cycle phase (as cells progress through the cell cycle, the amount of DNA ultimately doubles). PI will also label RNA, so the addition of RNase A is necessary for accurate determination of the percentage of cells in each phase of the cell cycle.

After fixing your cells, simply add the optimized Tali® Cell Cycle reagent, incubate for 30 minutes in the dark, and then analyze on the Tali® Image-Based Cytometer. The cell cycle data from the Tali® Image-Based Cytometer can be analyzed on the instrument or exported in either .csv or .fcs format, and analyzed using cell cycle modeling software (such as ModFit or MultiCycle).

Tali™ Calibration Beads Invitrogen™

This product contains three tubes of beads which are used to properly calibrate and align the Tali® Image-Based Cytometer.

Contents:

• Tali® Alignment Beads,
• Tali® Green Calibration Beads
• Tali® Red Calibration Beads

The calibration function of the Tali® Image-Based Cytometer recalculates the dynamic range and checks the alignment of the camera. Proper alignment and calibration of the Tali® Image-Based Cytometer ensures optimal performance of the instrument. It is recommended that alignment and calibration be performed every three months.

Drosophila S2 Cells in Schneider's Medium Gibco™

Gibco® Drosophila S2 cells are used for heterologous protein expression in the DrosophilaM Expression System (DES®). The S2 cell line was derived from a primary culture of late stage (20-24 hours old) Drosophila melanogaster embryos. Many features of the S2 cell line suggest that it is derived from a macrophage-like lineage. S2 cells grow at room temperature in ambient CO2 as a loose, semi-adherent monolayer in tissue culture flasks and in suspension in spinners and shake flasks. Drosophila S2 cells (frozen in Gibco® Schneider's Medium) feature:
• Expression of protein transiently or through generation of stable cell lines
• Quality and performance testing

Expression of protein transiently or through generation of stable cell lines
Drosophila S2 cells can be transfected with the recombinant expression vector alone for transient expression studies or in combination with a selection vector (e.g. pCoHygro or pCoBlast) to generate stable cell lines. A variety of DES® kits are available to allow expression of the recombinant protein of interest in S2 cells.

Quality and performance testing
Each lot of Gibco® S2 cells is tested for cell growth and viability post-recovery from cryopreservation. In addition, the Master Seed Bank has been tested for contamination of bacteria, yeast, mycoplasma and virus and has been characterized by isozyme and karyotype analysis.

Caution: Handle as potentially biohazardous material under at least Biosafety Level 2 containment. This product contains Dimethyl Sulfoxide (DMSO), a hazardous material. Review the Material Safety Data Sheet before handling.

MultiShot™ FlexPlate TOP10 Competent Cells Invitrogen™

MultiShot FlexPlate TOP10 chemically competent E. coli cells are cloning competent cells that are pre-aliquoted in a 96-well PCR plate to increase transformation productivity. The FlexPlate format can be divided down to any combination of 8-well segments to allow for flexibility in transformation throughput. MultiShot FlexPlate TOP10 competent E. coli cells are ideal for high-efficiency cloning and plasmid propagation. They allow stable replication of high-copy number plasmids and are the same competent cells that come with many of our cloning kits.

Versatile TOP10 cloning capabilities
MultiShot FlexPlate TOP10 Competent Cells are the laboratory workhorse for chemical transformations as they are compatible with a broad spectrum of DNA types for transformation. The TOP10 strain is useful for many cloning applications and provides transformation efficiencies in the MultiShot FlexPlate format of >1 x 108 cfu/µg with control plasmid DNA.

Key features of the MultiShot FlexPlate TOP10 Competent Cells include:
hsdR for efficient transformation of unmethylated DNA from PCR amplifications
mcrA for efficient transformation of methylated DNA from genomic preparations
lacZΔM15 for blue/white color screening of recombinant clones
endA1 for cleaner preparations of DNA and better results in downstream applications due to the elimination of non-specific digestion by endonuclease I
recA1 for reduced occurrence of non-specific recombination in cloned DNA

MultiShot FlexWell format—increase transformation productivity
The FlexPlate is a 96-well PCR plate can be used in automated liquid handling systems or divided into any combination of 8-well segments for flexibility in transformation throughput. Addition of DNA to the MultiShot FlexPlate Competent Cells can be done quickly with a multichannel pipet or a liquid handling system. After addition of DNA, the cells can be transformed efficiently by heat-shock using a water bath, heat block, or thermal cycler.

Key features of the MultiShot FlexPlate format include:
Increase throughput—compatible with automated liquid handling platforms
Flexible—transform in increments of 8 wells to entire 96-well plate
Convenient—competent cells pre-aliquoted into 96-well plate, ready for transformation

Genotype: F-mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 araD139 Δ(ara, leu)7697 galU galK rpsL (StrR) endA1 nupG

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

MultiShot™ FlexPlate DH10B T1R Competent Cells Invitrogen™

MultiShot FlexPlate DH10B T1R chemically competent E. coli cells are cloning competent cells that are pre-aliquoted in a 96-well PCR plate to increase transformation productivity. The FlexPlate format can be divided down to any combination of 8-well segments for flexibility in transformation throughput.

All of our T1R strains have the tonA (fhuA) deletion in their genotype that confers resistance to T1 and T5 phage. T1 bacteriophage spread rapidly and lyse E. coli hosts, which are commonly used for cloning and library construction. A resistant genotype offers added security to protect valuable clones and libraries. This is especially important for genome and sequencing centers where T1 phage infection would be catastrophic.

Diverse DH10B T1R cloning capabilities
MultiShot FlexPlate DH10B T1R competent E. coli cells are useful for many cloning applications as they are resistant to the effects of ligase and ligation buffers and provide transformation efficiencies of >1 x 108 cfu/µg with control plasmid DNA. The cells are also suitable for cloning DNA that contains methylcytosine and methyladenine (i.e., genomic DNA) and ideal for cloning large plasmids and BACs.

Key features of the MultiShot FlexPlate DH10B T1R Competent Cells include:
mcrA, mcrBC, mrr, and hsdRMS elimination of restriction systems to allow construction of more representative genomic constructs
tonA (fhuA) genotype to confer resistance to T1 and T5 phage
endA1 for increased plasmid yield and quantity
recA1 for reduced occurrence of non-specific recombination in cloned DNA
lacZΔM15 for blue/white color screening of recombinant clones

MultiShot FlexWell format—increase transformation productivity
The FlexPlate is a 96-well PCR plate that can be used in automated liquid handling systems or divided into any combination of 8-well segments for flexibility in transformation throughput. Addition of DNA to the MultiShot FlexPlate Competent Cells can be done quickly with a multichannel pipet or a liquid handling system. After addition of DNA, the cells can be transformed efficiently by heat-shock using a water bath, heat block, or thermal cycler.

Key features of the MultiShot FlexPlate format include:
Increase throughput—compatible with automated liquid handling platforms
Flexible—transform in increments of 8 wells to entire 96-well plate
Convenient—competent cells pre-aliquoted into 96-well plate, ready for transformation

Genotype: F- mcrA Δ(mrr-hsdRMS-mcrBC) φ80dlacZΔM15 lacX74 recA1 endA1 araD139 Δ(ara-leu)7697 galU galK rpsL nupG λ- tonA

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

IPL-41 Insect Medium (1X) Gibco™

Gibco® IPL-41 Insect Medium was originally designed for the growth of Spodeptera frugiperda (Sf9) cells and the expression of recombinant Autographa Californica Nuclear Polyhedrosis Virus (rAcNPV) using the Baculovirus Expression Vector System (BEVS). We offer a variety of Gibco® Media options for a range of insect cell culture applications.

This IPL-41 Insect Medium is modified as follows:

WithWithout
• L-glutamine • Tryptose phosphate broth
• Sodium bicarbonate • Yeastolate

The complete formulation is available. IPL-41 Insect Medium contains unique components required for insect cell culture, including malic acid, fumaric acid, and alpha-ketoglutaric acid.

Product Use
For Research Use Only: Not intended for animal or human diagnostic or therapeutic use.

Dual Site cGMP Manufacturing and Quality System
Gibco® IPL-41 Insect Medium is manufactured at a cGMP compliant facility, located in Grand Island, New York. The facility is registered with the FDA as a medical device manufacturer and is certified to ISO 13485 standards. For supply chain continuity, we offer a comparable Gibco® IPL-41 Insect Medium product made in our Scotland facility (11405-057). This facility is registered with the FDA as a medical device manufacturer and is certified to the ISO 13485 standard.

Gibco® IPL-41 Insect Medium is commonly supplemented with 10% Fetal Bovine Serum (FBS) before use. IPL-41 Insect Medium requires ambient CO2in order to maintain physiological pH.

Tali™ Cellular Analysis Slides Invitrogen™

The Tali® Cellular Analysis Slides are specifically designed for use with the Tali® Image-Based Cytometer. Each slide contains two separate, enclosed analysis chambers designed to accommodate 25 µl of sample per chamber. Each box contains 50 slides.

Ready to Use for Your Convenience
Each Tali® Cellular Analysis slide is pre-sterilized and individually packaged. Since the Tali® Image-Based Cytometer is a fluorescent cellular analysis instrument the slides are composed of low fluorescent plastic. The slides are disposable; after use the slides can be disposed of with you regular biohazard waste.

For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.

Learn more about the the Tali® Image-based Cytometer

MultiShot™ StripWell TOP10 Chemically Competent E. coli Invitrogen™

MultiShot StripWell TOP10 chemically competent E. coli cells are cloning competent cells that packaged in a rack containing 12 strips of 8 tubes to increase productivity for medium-throughput bacterial transformations. TOP10 competent E. coli cells are ideal for high-efficiency cloning and plasmid propagation. They allow stable replication of high-copy number plasmids and are the same competent cells that come with many of our cloning kits.

Versatile TOP10 cloning capabilities
MultiShot FlexPlate TOP10 competent E. coli cells are the laboratory workhorse for chemical transformations as they are compatible with a broad spectrum of DNA types for transformation. The TOP10 strain is useful for many cloning applications and provides transformation efficiencies in the MultiShot FlexPlate format of >1 x 108 cfu/µg with control plasmid DNA.

Key features of the MultiShot FlexPlate TOP10 Competent Cells include:
hsdR for efficient transformation of unmethylated DNA from PCR amplifications
mcrA for efficient transformation of methylated DNA from genomic preparations
lacZΔM15 for blue/white color screening of recombinant clones
endA1 for cleaner preparations of DNA and better results in downstream applications due to the elimination of non-specific digestion by endonuclease I
recA1 for reduced occurrence of non-specific recombination in cloned DNA

MultiShot StripWell format—flexible for no waste
Each StripWell of eight connected tubes is designed with the same single-tube, single-use features as our One Shot format tubes. This format allows for all steps of the transformation protocol, up to plating, to take place in the same tube, thereby saving time and preventing contamination. After addition of DNA, MultiShot StripWell competent cells can be transformed by heat-shock at 42°C using a water bath, all in the same tube.

The StripWell tubes can be cut to permit transformations in a single tube, eliminating wasted aliquots of cells and avoiding freeze-thaws that can result in reduced transformation efficiency.

Key features of the MultiShot StripWell format include:
Increased productivity—for medium throughput experimentation
Maximal flexibility—transform as few as 1 tube and as many as 96 from the StripWell rack
Familiar convenience—no aliquotting, add DNA directly to cells, heat shock, and recover in the same tube
Peace of mind—single-use transformation minimizes contamination

Genotype: F-mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15 ΔlacX74 recA1 araD139 Δ(ara, leu)7697 galU galK rpsL (StrR) endA1 nupG

Find the strain and format that you need
We offer many other E. coli strains and formats of chemically competent cells and electrocompetent cells to help meet your specific transformation needs. If you require other high-throughput transformation options, choose from our collection of MultiShot formatted comp cells or email us for custom formatting options.

One Shot™ BL21(DE3)pLysE Chemically Competent E. coli Invitrogen™

BL21(DE3)pLysE E. coli are ideal for use with T7 promoter-based expression vectors. Like BL21(DE3)pLysS E. coli, BL21(DE3)pLysE carry the lambda DE3 lysogen. In addition, BL21(DE3)pLysE cells contain the pLysE plasmid, which constitutively expresses T7 lysozyme. T7 lysozyme reduces the basal expression of target genes by inhibiting T7 RNA polymerase. The pLysE plasmid in BL21(DE3)pLysE expresses higher levels of T7 lysozyme than the pLysS plasmid in BL21(DE3)pLysS.
The BL21(DE3)pLysE strain provides tighter control of T7 RNA polymerase, which is necessary when the recombinant protein to be expressed is toxic.

FreeStyle™ F17 Expression Medium Gibco™

FreeStyle™ F17 Expression Medium is an animal origin–free, chemically defined, protein-free medium specifically developed to support the growth and transfection of 293-F and CHO cells in suspension without adaptation. This is a multi-platform medium compatible with a range of transient expression systems. The addition of 4–8 mM L-glutamine or GlutaMAX™ supplement is required before use. Gibco® FreeStyle™ F17 Expression Medium features:

• Little or no required adaptation
• Ability to support suspension growth and transfection of 293-F and CHO cells
• Animal origin–free, protein-free, and chemically defined formulation
• Scalability in spinner flasks and bioreactors

Little or no required adaptation
Gibco® 293-F, 293-H, FreeStyle™ 293-F, and CHO-S cells in suspension can be cultured directly into Gibco® FreeStyle™ F17 Medium without adaptation. Cells adapted to other commercially available serum-free media can be subcultured directly into Gibco® FreeStyle™ F17 Medium, usually without any further adaptation. Cells usually require adaptation from serum-containing formulations.

Ability to support suspension growth and transfection of 293-F and CHO cells
Gibco® FreeStyle™ F17 Medium provides equal or better performance compared to Gibco® FreeStyle™ 293 Expression Medium and Gibco® FreeStyle™ CHO Medium. Gibco® FreeStyle™ F17 Medium supports 293-F cells at a peak density of 6–7 × 106 viable cells per mL, and supports CHO-S cells at a peak density of 8–9 × 106 viable cells per mL. Cells cultured in Gibco® FreeStyle™ F17 can be transfected using a wide variety of transfection reagents, including lipid-based transfection reagents, such as 293fectin™ and Freestyle™ MAX Reagent. Protein expression typically exceeds 75–150 µg/mL IgG in 293-F cells.

Animal origin–free, protein-free, and chemically defined formulation
Gibco® FreeStyle™ F17 Medium is animal origin–free, protein-free, and chemically defined, allowing for easier purification of your protein of interest. Gibco® chemically defined media contain no proteins, hydrolysates, or components of unknown composition.

Scalability in spinner flasks and bioreactors
Protein production using Gibco® FreeStyle™ F17 Medium can be scaled up in spinner flasks or bioreactors. The appropriate spinner or impeller speed and seeding density should be optimized for each system. Depending on the impeller design and speed, it may be necessary to supplement Gibco® FreeStyle™ F17 Medium with additional Pluronic® F-68 to avoid sheer stress in the culture.

cGMP manufacturing and quality system
Gibco® FreeStyle™ F17 Medium is manufactured at a cGMP-compliant facility located in Grand Island, New York. The facility is registered with the FDA as a medical device manufacturer and is certified to ISO 13485 standards.

FreeStyle™ CHO Expression Medium Gibco™

FreeStyle™ CHO Expression Medium is an animal origin–free, chemically defined, protein-free medium specifically developed to support the growth and transient transfection of CHO-S cells in suspension without adaptation.

This medium requires supplementation with 8 mM glutamine before use. Gibco® FreeStyle™ CHO Expression Medium features:

• Formulation without hypoxanthine and thymidine for use with or without dhfr systems
• Ability to support high-density suspension growth and transient transfection of CHO-S cells
• Animal origin–free, protein-free and chemically defined formulation
• Easy use as part of the FreeStyle™ MAX CHO Expression System for protein production
• Scalability in spinner flasks and bioreactors

Formulation without hypoxanthine and thymidine for use with or without dhfr systems
Gibco® FreeStyle™ CHO Expression Medium is made without hypoxanthine and thymidine for use in dihydrofolate reductase (dhfr) amplification systems. Non-dhfr systems require the addition of HT Supplement before use.

Ability to support high-density suspension growth and transient transfection of CHO-S cells
Gibco® FreeStyle™ CHO cells in suspension can be cultured directly into Gibco® FreeStyle™ CHO Expression Medium without adaptation. Cells adapted to other commercially available serum-free media can be subcultured directly into Gibco® FreeStyle™ CHO Expression Medium, usually without any further adaptation. Cells usually require adaptation from serum-containing formulations. Cells cultured in Gibco® FreeStyle™ CHO Expression Medium can be transfected using lipid-based transfection reagents, such as Freestyle™ MAX reagent.

Animal origin–free, protein-free and chemically defined formulation
Gibco® FreeStyle™ CHO Expression Medium is animal origin–free, protein-free, and chemically defined, allowing for easier purification of your protein of interest. Gibco® chemically defined media contain no proteins, hydrolysates, or components of unknown composition.

Easy use as part of the FreeStyle™ MAX CHO Expression System for protein production
The FreeStyle™ MAX CHO Expression System is a breakthrough technology for rapid (see figure) and high-yield mammalian protein production in 30 mL and 1 L batch sizes (see figure). The FreeStyle™ MAX CHO Expression System combines GIBCO® FreeStyle™ media, FreeStyle™ MAX reagent, and either FreeStyle™ CHO-S cells or FreeStyle™ 293-F cells in one kit.

Scalability in spinner flasks and bioreactors
Protein production using Gibco® FreeStyle™ CHO Expression Medium can be scaled up in spinner flasks or bioreactors. The appropriate spinner or impeller speed and seeding density should be optimized for each system. Depending on the impeller design and speed, it may be necessary to supplement Gibco® FreeStyle™ CHO Expression Medium with additional Pluronic® F-68 to avoid sheer stress in the culture.

cGMP manufacturing and quality system
Gibco® FreeStyle™ CHO Expression Medium is manufactured at a cGMP-compliant facility located in Grand Island, New York. The facility is registered with the FDA as a medical device manufacturer and is certified to ISO 13485 standards.

MC1061/P3 Chemically Competent E. coli Invitrogen™

MC1061/P3 Chemically Competent E. coli are used for highly efficient transformation of vectors that require the P3 episome for selection and maintenance (i.e., pCDM8, pcDNA™1.1, or any other supF-containing vector).

Contents
• 5 x 300 μL competent MC1061/P3 E. coli
• 50 µL pUC19 plasmid DNA (10 pg/μL in 5 mM Tris-HCl, 0.5 mM EDTA, pH 8)
• 15 mL SOC medium

MAX Efficiency™ DH10B Competent Cells Invitrogen™

MAX Efficiency DH10B Competent Cells are highly efficient E. coli, perfect for most applications. DH10B E. coli are available in both electrocompetent and chemically competent formats. The high transformation efficiency makes them ideal for generating cDNA or genomic libraries. High-efficiency transformation is seen with plasmids 150 kb in size. The versatile DH10B genotype has the following features:

lacZ for blue/white screening of recombinant clones
• Elimination of mcrA, mcrBC, mrr, and hsdRMS restriction systems to allow construction of more representative genomic libraries
• A1 mutation to increase plasmid yield and quantity

ElectroMAX™ Stbl4™ Competent Cells Invitrogen™

ElectroMAX™ Stbl4™ Competent Cells are specifically designed for cloning unstable inserts. As electrocompetent cells, they have one of the highest transformation efficiencies available (>5×109 cfu/µg), making them ideal for generating cDNA and genomic libraries and for cloning unstable inserts. These electrocompetent E. coli:

• Are ideal for cloning unstable DNA—stabilizes direct repeat and retroviral sequences
• Permit efficient cloning of methylated genomic DNA
• Support blue/white screening
• Are designed to deliver high-yield plasmid preparations for downstream applications
• Provide transformation efficiencies of >5×109 cfu/µg

Propagating unstable and large DNA with high transformation-efficiency cells
Many competent cell strains have the recA1 genotype, which reduces recombination. However there are some instances when the DNA that you are trying to clone is still unstable in such cells, perhaps due to the presence of inverted or direct repeats, or GC-rich tracts. While such sequences are relatively common in eukaryotic genomes, they are rare in E. coli. Consequently, rearrangements may occur when these sequences are introduced into standard E. coli strains.

Using ElectroMAX™ Stbl4™ Cells
ElectroMAX™ Stbl4™ electrocompetent E. coli cells are a derivative of Stbl2™ cells and are ideal for the cloning of unstable inserts such as retroviral sequences, direct repeats, and tandem array genes. Furthermore, ElectroMAX™ Stbl4™ cells are useful for the generation of cDNA libraries using plasmid-derived vectors and are able to take up and maintain large plasmids (e.g., 50 kb cosmids and 100–200 kb P1 clones). The Stbl4™ cells also contain an F' episome, allowing them to serve as a host for single-stranded DNA such as M13mp cloning vectors. The lacZΔM15 marker provides α-complementation of the β-galactosidase gene from pUC or similar vectors, and can therefore be used for blue/white screening of colonies on agar plates containing Xgal or Bluo-gal and IPTG. The mcrA mutation and the mcrBC-hsdRMS-mrr deletion allow cloning of genomic sequences which are methylated. Finally, the endA1 mutation greatly increases plasmid yield and quality.

Genotype: mcrA Δ(mcrBC-hsdRMS-mrr) recA1 endA1 gyrA96 gal-thi-1 supE44 λ-relA1 Δ(lac-proAB)/F' proAB+lacIqZΔM15 Tn10 (TetR)
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