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...idea to assay each fraction by silver stain or SYPRO Ruby stain to determine purity. Only the cleanest...preparation. The 15% iodixanol step has 1M NaCl to destabilize ionic interactions between macromolecules. The...QuickSeal tubes out of the rotor and place them in a stable rack. **Make sure not to disturb the gradient!*...top of the QuickSeal tube with a 16 ga needle and start collecting 0.5 mL to 1 mL fractions per tube. Avoid...at the bottom using an 18 ga needle. Immediately start collecting 0.5 to 1 mL fractions in microcentrifuge...consecutive gradient fractions followed by silver stain. Note the increased number of contaminants in each...

... of a substance in that liquid. In order to accurately measure the concentration of a substance based ...Background Information During several different stages of molecular cloning, it is important to get a ...to determine the concentration of a particular substance in that liquid. Molecules absorb different wavelengths...need to know the wavelength of light that your substance maximally absorbs. In the case of nucleic acid...samples, place 1-2µL of mini-prepped DNA onto the pedestal. Close the lid and click measure, be sure to record...

...questions. Protocols Video protocol guides for standard laboratory procedures. (Link opens in a new window...Bacterial Transformations We walk you through a standard plasmid transformation protocol and offer some...Inoculating a Liquid Bacterial Culture Protocol Getting Started with Tissue Culture Tips and tricks for working...Gel Electrophoresis Gel electrophoresis is the standard laboratory procedure for separating DNA by size...Description Jessica Welch, PhD In this first installment of the Addgene Careers series, we sit down with...future careers. Eric J. Perkins, PhD In this installment, we sit down with Senior Scientific Project Leader...

...time, you will need to establish glycerol stocks. The addition of glycerol stabilizes the frozen bacteria...alive. A glycerol stock of bacteria can be stored stably at -80°C for many years. Protocol Video Watch the... glycerol stock tube at -80°C. The stock is now stable for years, as long as it is kept at -80°C. Subsequent...information page. The next day you will be able to start an overnight culture for plasmid DNA prep the following...

...Quantify virus by counting antibiotic resistant colonies Generating Stable Cell Lines with Lentivirus Genomically...Introductory techniques designed to help you get started in the lab. Name Description (Link opens in a new...monoclonal cell lines from a polyclonal pool of stable cells AAV Production in HEK293 Cells Produce adeno-associated...Protein G columns Watch the Video! Coomassie Purity Stain Determine purity and concentration of recombinant...

... carry one or more antibiotic resistance genes, which confer resistance to a specific antibiotic to the... carrying them. The presence of an antibiotic resistance gene on a plasmid allows researchers to easily...intend to do a miniprep, you will usually want to start 2 mL in a Falcon tube. For larger preps, you might...antibiotic in your LB media matches the antibiotic resistance on your plasmid. If the bacteria on your LB agar...

...for a variety of downstream applications such as stable-cell line generation. Workflow Timeline Day 0: ... 10-013-CV L-alanyl-L-glutamine (or alternative stable glutamine such as glutaGRO, Corning 25-015-CI) ...: 10% v/v FBS and 4 mM L-alanyl-L-glutamine (or stable alternative, such as glutaGRO) To a 500 mL bottle...and for each cell line. Considerations Before You Start The health of the packaging cell line is critical...endonuclease negative E. coli strain such as NEB stable. Make a mixture of a total of 500 μL PEI-OptiPro...

...Standard protocol for performing agarose gel electrophoresis, including tips to improve resolution and...Ligation Introduction Gel electrophoresis is the standard lab procedure for separating DNA by size (e.g....New England Biolabs B7022S Procedure Pouring a Standard 1% Agarose Gel: Measure 1 g of agarose. Pro-Tip... solution and rinse with water to even out the staining after the gel has been run, just as you would ...-30 mins, replace EtBr solution with water and destain for 5 mins. Using any device that has UV light,...

...purification step, it is important to digest plenty of starting material. We recommend 1.5-2μg of donor plasmid...lanes between samples. In addition to a DNA ladder standard, it is also a good idea to run an uncut sample...plasmid. We recommend around 100ng of total DNA in a standard ligation reaction. You ideally want a recipient...important to set up negative controls in parallel. For instance, a ligation of the recipient plasmid DNA without...instructions for your competent cells. For most standard cloning, you can transform 1-2μl of your ligation...

...containing the carbenicillin (amp) resistance gene (or other antibiotic resistance) Procedure Day 1 Prepare carbenicillin... cells containing plasmids differing in their resistance genes, as one does not need to prepare separate...place of ampicillin because carbenicillin is more stable, so it is potentially more effective at selecting...

... out more protocols and videos to help you get started in the lab! Introduction For many experiments, ...precisely to create the solution you expect. Understanding how to obtain the correct amounts of materials...weighing and prevent cross-contamination with other substances. They also help you transfer the material to ...your lab’s material safety data sheets (MSDS) to understand how to properly dispose of reagents that you ...

... use it to allow the temperature to stabilize. Use water resistant markers, such as permanent markers,... out more protocols and videos to help you get started in the lab! Introduction A water bath is a piece...water bath, be sure to use a marker that is also resistant to chemicals such as ethanol. Writing on the tops...

...Dam or Dcm methylase positive strains will be resistant to cleavage at certain restriction sites. See ...identical, to their recognition sites. This is due to "Star Activity" and can happen for a variety of reasons...(Link opens in a new window) NEB's website about star activity . If you are digesting a large number of... of plasmids with the same enzyme(s) (for instance, in a diagnostic digest), you can create a "Master ...

... 10-013-CV L-alanyl-L-glutamine (or alternative stable glutamine such as glutaGRO, Corning 25-015-CI) ...: 10% v/v FBS and 4 mM L-alanyl-L-glutamine (or stable alternative such as glutaGRO) To a 500 mL bottle... a new working stock. Considerations Before You Start The health of the cell line is critical for obtaining...endonuclease negative E. coli strain such as NEB stable. Dilute 1:3 (µg DNA:µg PEI) in 500 µL total of ...

...the two ends of the vector together). Protocol: Standard Insert + Vector DNA Ligation Before setting up...each and their concentration. However, for most standard cloning (where the insert is smaller than the ...fine. We recommend around 100ng of total DNA in a standard ligation reaction. Use a (Link opens in a new ...of competent cells and verifies the antibiotic resistance of the plasmid Cut vector - Background due to...

...protocol describes the basic steps for fixing and staining cells in culture with a primary antibody against...15 mL conical tubes 50 mL conical tubes Before Starting Refer to the manufacturer's instructions for additional...500 µL PBS on a rocking platform. (Optional) Counterstain nuclei with 500 µL of 300 nM DAPI working solution... Review the manufacturer's instructions before starting your experiment and consider titrating your antibody...

... out more protocols and videos to help you get started in the lab! Introduction The pipette is an essential...focused on single channel pipettes. These come in standard sizes: P2, P10, P20, P200, and P1000. The table...each type of pipette. This section will help you understand how to read each display to dispense the correct...multiple “stops” on the plunger, where you feel resistance while pressing down on the pipette. Stop at the...

...shaking platform set to 120 rpm 37 °C bead bath Clamp stand and clamps Autoclave 0.1–1 mL single channel pipette...UFC903024 50 mL LoBind tubes, VWR 76289-498 Before Starting Wipe down all pipettes and equipment with 10% ...if this has not already been done. We typically start with about 250 mL of supernatant and add 250 µL ...Attach the Gravitrap column to a clamp on a clamp stand. Use scissors to cut the bottom of the Gravitrap...

...different steps in RNA extraction. Before Starting RNA is not as stable as DNA and is susceptible to degradation...microcentrifuge, see step 4 of either protocol before you start. Homogenizer Vortexer -20°C freezer -80°C freezer...Procedure Option #1 - Solution D Protocol Before starting this protocol, make sure to prepare solution D...

...protocol, the following protocol can be used as a starting point for CRISPR libraries. This protocol allows...library. This protocol assumes familiarity with standard bacterial transformation and basic knowledge of...efficiency electrocompetent cells that are suitable for unstable or recombination-prone DNA. The use of electrocompetent...down at 30 ℃ overnight. Critical Ensure at this stage that no unabsorbed media drips onto the lid. Let...