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Showing: 21 - 40 of 363 results

  1. Course-Based Undergraduate Research Experiences (CUREs)

    Type
    Blog Post
    Published
    Feb. 9, 2023, 2:15 p.m.
    ...reduce barriers to implementation. Funded by the NSF (with Co-PIs Jessica Bell, Lisa Gentile, Ellis Bell...Hampshire. He mentors undergraduates conducting NIH- and NSF-funded research on planarian flatworms both in and...). But is it possible to bring the kinds of transformative educational experiences afforded to those fortunate...NADH production.   CUREs are beginning to transform undergraduate education in the sciences by making...

  2. Celebrating Accomplishments in the Lab

    Type
    Blog Post
    Published
    May 8, 2014, 3:07 p.m.
    ...Improving your work-life balance Balancing the Scale: NSF's Career Life-Balance Initiative Can Scientists Maintain...

  4. Troubleshooting and Optimizing a Western Blot

    Type
    Blog Post
    Published
    Sept. 17, 2024, 1:15 p.m.
    ...large.  Transfer method   Wet transfers are more efficient, so if you’re struggling to transfer a large...consider using a wet transfer with a long transfer time. Be aware that the transfer works by electricity...methanol concentration in transfer buffer is < 20% Wet transfer Increase transfer time Increase voltage...decrease alcohol in transfer buffer Small proteins: Over-transferring Transfer with two membranes...increase alcohol in transfer buffer Mixed proteins: Transferring issues Transfer with two membranes...commercially available options to choose from.  Transfer Transfers are a little trickier than gels and may require... after transfer. Troubleshooting The two most common (non-technical) issues with transferring are smaller...

  5. Quick Guide to All Things Lentivirus

    Type
    Blog Post
    Published
    March 21, 2017, 2:30 p.m.
    ...membrane pores) transfection. These techniques are still used and efficiently transfer plasmid DNA efficiently...comes to transferring DNA into primary cells or non-dividing cells. To target these un-transfectable cells...stable expression of the transgene   Transfer plasmids The transfer plasmid is the vector you clone your...will first need to transfect producing cells, usually 293T cells, with your transfer plasmid and your packaging...you don’t have any experience in transfection, CaCl2 transfection is a simple and cheap technique that...background Until the development of viral vectors, gene transfer into mammalian cells often relied on chemical ... particle (Gag, Pol, Tat, Rev and Env) and the transfer plasmid encoding the insert of interest as well...

  6. Plasmids 101: Control Plasmids

    Type
    Blog Post
    Published
    April 9, 2015, 3:29 p.m.
    ...effects of the transfection itself (i.e., the vector used in transfection, transfection reagent, or transfection...experiments employ transfection, negative, positive, and replicate controls.  Transfection controls: empty...vector and internal control A transfection control measures transfection efficiency and enables observation... allows you to examine if the transfection reagents or the transfection process itself has any cytotoxic...Another type of transfection control is an internal control vector, which measures transfection efficiency....luciferase) that is either co-transfected with the test plasmid or transfected into a separate well of your...due to the original transfection conditions. Now that we have successfully transfected our cells (Figure...

  7. Plasmids 101: Mammalian Vectors

    Type
    Blog Post
    Published
    March 25, 2014, 3:15 p.m.
    ...process called transfection. Transfection is somewhat comparable to bacterial transformation (the introduction...not guarantee 100% transfection efficiency. Stable transfection A stable transfection is used to create...the genome to form a stable transfection. Unlike bacterial transformation, scientsts do not "select" for...the transfected plasmid to be expressed transiently. Since the DNA introduced in the transfection process...occurs and whether selection is necessary for transfected cells. Before getting into the mammalian plasmid...however, the techniques and reagents vary. Plasmid transfection into mammalian cells is fairly straightforward...reporter genes are often employed to easily monitor transfection efficiencies and expression levels in the cells...

  8. Save Time and Money by Making Your Own Competent Cells

    Type
    Blog Post
    Published
    Jan. 28, 2014, 3:10 p.m.
    ...find the subsequent transformation protocols below: Untergasser Lab Transformation of chemically competent... easily transformed without a heat-shock step. Because of the large number of transformations being performed...that transforms well in other competent cells) to ensure that your cells can be readily transformed. Compare...Want even more tips for transforming your cells? Check out our transformation guide.   ...We perform over 100 transformations each week at Addgene, so we need to be cost and time efficient. We...a little-known reagent for streamlining the transformation step. Read on to find protocols and tips that...competent cells. If you need a high efficiency of transformation (for example, if you are working with a library...

  9. Your Lentiviral Plasmid FAQs Answered

    Type
    Blog Post
    Published
    April 23, 2014, 1:08 p.m.
    ...produced by co-transfecting three essential ingredients: the lentiviral packaging vector, a transfer vector including...considered. Q2: Can I use lentiviral transfer vectors for transient transfections? A2: Technically, yes. Will ...3rd-generation transfer vectors apart? A3: Addgene defines 2nd- or 3rd-generation transfer vectors based... Are transfer plasmids replication competent? What is SIN? A6: Most (if not all) Addgene transfer plasmids...which is rarely more than 30% of the transfer plasmid. Many transfer vectors are SIN. Packaging plasmid...the 3rd-generation system is that it involves transfecting four different plasmids into the producer cells...plasmids, an envelope plasmid, and the lentiviral transfer vector), rather than the three used for 2nd-generation...

  10. The Golden Stopwatch Award: Recognizing Facilitators of Research

    Type
    Blog Post
    Published
    Sept. 5, 2019, 1:06 p.m.
    ...Addgene Help Center: Tech Transfer Technology Transfer Information Tech Transfer News: A Reintroduction ...Addgene account for Tech Transfer Offices. They’re packed with tech transfer resources (summaries, electronic...question? Refer them to Addgene’s Tech Transfer Team: techtransfer@addgene.org Congratulations to the Golden...stats and strategies with tech transfer offices. Drop us a line at techtransfer@addgene.org. Albert Einstein...requests from Addgene MTA: material transfer agreement Technology Transfer: the exchange of intellectual property...addgene.org identifies the hold-up. Your Material Transfer Agreement is stuck in “pending.” Fear not, there... to make MTA turnaround faster with technology transfer offices (TTOs). The latest of these efforts is...

  11. Pooled Library Amplifications

    Type
    Blog Post
    Published
    May 30, 2024, 1:30 p.m.
    ...libraries, chemical transformations can also be used. Efficiency for chemical transformations is less than that...for your transformation(s). The amount of competent cells you need total and per transformation may vary...the manufacturer’s protocol for transformation and expected transformation efficiency, or more specifically...with a large backbone might be more difficult to transform.    Figure 1: Factors to consider when ... coverage, since this will help decide what transformation efficiency you need to achieve. Most pooled...contains 5,000 plasmids, your goal for your transformation would be to obtain 100 x 5,000 = 500,000 colonies...likely rely on serial dilutions to estimate transformation efficiency (Figure 2).    Figure 2: ...

  12. Mobile-CRISPRi: Bringing CRISPRi to Diverse Bacteria

    Type
    Blog Post
    Published
    April 4, 2019, 12:53 p.m.
    ...chromosomal copy of the RP4 transfer machinery mobilize these plasmids for transfer to recipient cells during...disease. However, the rate of transfer was variable. They measured transfer rates by comparing the number... P. mirabilis, had only ~1 transfer per 1,000,000 colonies. Higher transfer rates are better suited for...diverse bacteria species. Existing protocols can transfer CRISPRi into a single bacterial strain, such as...Mobile-CRISPRi: a modular approach for CRISPRi transfer Mobile-CRISPRi offers two advantages over existing...introduced into a broader range of bacteria. Once transferred, Mobile-CRISPRi stably integrates into the genome...highly conserved glutamine-fructose-6-phosphate aminotransferase (glmS) gene in the recipient bacteria due ...

  13. Plasmid Preps: Different Purity, Different Quantities, Different Uses

    Type
    Blog Post
    Published
    June 16, 2020, 1:25 p.m.
    ... in 3 different ways: Transformation grade DNA Cloning grade DNA Transfection grade DNA Figure...Figure 1: Transformation introduces transformation grade plasmids into a bacterial cell. Transformation...plasmids into mammalian cells? Use transfection grade DNA. Transfection is the process of inserting an ... differences between transformation, transduction, conjugation, and transfection Resources on Addgene.org...Transformation grade DNA  Transformation is the process of inserting exogenous DNA in a microorganism. The amount ...plasmid DNA that is necessary for bacterial transformation of chemically and electrocompetent cells is...without commercially available kits and DNA for transformation doesn’t need to be as pure as for other uses...

  14. Tips from the Repository Trenches: Using Barcodes to Track Samples

    Type
    Blog Post
    Published
    Oct. 6, 2015, 2:30 p.m.
    ... treated to easily take in plasmids (transformation). Transformed bacteria are then grown up on antibiotics...received is immediately transformed and stored. Some samples need to be transformed with a micropulser using... performs an average of 140 transformations. The lab typically transforms newly deposited samples from...delivered by a mail courier and then the journey of transformation and storage begins. Some samples are submitted...long-term storage in our facilities, every sample is transferred to a 2D barcoded tube (see next section) and ...make a new tube from a replicate sample. The transformation After the DNA has been received and stored,...different strains of E. coli that can be used for transformation. The preferred E. coli strains for storage ...

  15. Multiplex Genome Editing with CRISPR-Cpf1

    Type
    Blog Post
    Published
    May 9, 2017, 2:12 p.m.
    ... rely on transfection of more than one vector to express the gRNAs and Cas9. Co-transfections can lead...the usual transfection drawbacks: transient expression and needing to work with a transfectable cell line...Cassettes transfection gRNAs expressed from a polycistronic transcript  Requires co-transfection of Cas9...Cassettes transfection gRNAs expressed from a polycistronic transcript Requires co-transfection of Cas9  ... GFP tag were transfected on a single plasmid. This is versus 2.4% of cells transfected with a pool of...expression vectors which are often more difficult to transfect or package into viral vectors. Cas9 multiplexing...References Yamamoto Lab Golden Gate Assembly transfection One vector expresses Cas9 and up to 7 gRNAs...

  16. Antibodies 101: The Basics of Western Blotting

    Type
    Blog Post
    Published
    March 8, 2021, 2:41 p.m.
    ...In a wet transfer system the sandwich is completely submerged in a tank filled with a transfer buffer formulated...electric current. The wet transfer process is very effective in transferring a broad range of protein ...systems efficiently transfer a range of protein sizes in minutes without any transfer buffer. These systems...encoding your protein of interest from Addgene, transfected it into your target cells, now what? How can ...western, proteins are: (1) separated by size, (2) transferred to a membrane, and  (3) detected using antibodies... a mixture of protein is separated in a gel, transferred to a membrane, stained with antibodies, and finally...polyvinylidene difluoride (PVDF) in a step called protein transfer. While both nitrocellulose and PVDF are commonly...

  17. Overcoming the Challenges of Lentiviral Production

    Type
    Blog Post
    Published
    Aug. 7, 2018, 12:31 p.m.
    ...changing transfection ratios can affect transfection efficiency. For some transgenes, transfection optimization...containing structural genes and a transfer plasmid carrying the transfer gene. By dividing the viral elements... structural elements, envelope, and transfer gene are transfected into a packaging cell line, usually ...requirement for additional DNA can impact the transfection efficiency of the packaging cell line and thereby...recommended that you try a few different ratios of transfer, envelope, and packaging plasmids in order to ... titers. Requiring an additional plasmid for transfection can make these optimization experiments a bit...Producing lentivirus: it's all about the T's (transfection and titers) To produce lentivirus, the plasmids...

  18. Technical Design of a Western Blot

    Type
    Blog Post
    Published
    Aug. 22, 2024, 1:15 p.m.
    ...Types of transfers Your transfer options are wet, semi-dry, or dry/electroblot. A wet transfer is the most... while semi-dry transfers require a semi-dry transfer cell. Dry/electroblot transfers only work in the...) steps to the transfer: you’ll need to pre-wet most PVDF membranes before the transfer and allow them...  Note that each type of transfer requires different equipment. Wet transfers can be done in an insert...strip/reprobe Semi-dry transfer Decreased efficiency Electroblot transfer Increased cost; decreased...a size range appropriate for the target(s) and transfer method. Membranes The two membrane options are... most efficient method, meaning that it will transfer the most protein from your gel to your membrane....

  19. RUBY-Red Siliques

    Type
    Blog Post
    Published
    March 1, 2022, 2:15 p.m.
    ...Arabidopsis seed following floral dip transformation next to an untransformed seed from the same plant beginning...Selectable transgene markers for plant transformation fall into two main categories: antibiotic/herbicide...resistance genes usually involves killing the untransformed seedlings or callus (undifferentiated plant ...For example, with CRISPR-Cas9 gene editing, transformation may be identified by resistance to an antibiotic...antibiotic. Successful editing of transformants then typically occurs in T0 plants (from callus) or T1 plants...contaminate it. I have used it for selecting transformation events and am currently planning to use it ...beginning to germinate. (Top right, second panel) Transformed seedlings can be selected without antibiotics...

  20. Plasmids 101: Shuttle Vectors

    Type
    Blog Post
    Published
    May 20, 2025, 1:15 p.m.
    ...mammalian analogue of bacterial transformation is transfection. In stable transfection, DNA from the plasmid is...called transfer vectors. The gene of interest is cloned into a shuttle vector for transfection into producer...post on shuttle vectors delivered by transformation and transfection and left the business of transduction... Plasmids 101: Transformation, Transduction, Bacterial Conjugation, and Transfection Plasmids 101: Choosing... If we all use the same molecular code, can I transfect any old bacterial plasmid into HeLa cells and ...retain the vector as cells divide. In transient transfection, the vector remains episomal, meaning it stays...replication at all. In these cases, transient transfection may be sufficient for your needs even without...
Showing: 21 - 40 of 363 results