Skip to main content
Addgene

Enter a sequence to perform a BLAST-based search of the Addgene plasmid sequence database.

Information

In Category

We narrowed to 505 results for: sam

Showing: 61 - 80 of 505 results

  1. Antibodies 101: Stripping and Reprobing Western Blots

    Type
    Blog Post
    Published
    Aug. 1, 2024, 1:15 p.m.
    ...membrane will remove some of your sample —and harsher stripping means more sample loss. If you are still optimizing...you want to detect more than one protein in your sample? Or what if something weird happened during your..., almost like new. This approach preserves your sample and saves you from having to run a whole new gel...stripping solution (see below) to minimize loss of your sample from the membrane. Next, plan out the order of ... the weaker binding ones first to preserve your sample. Pro tip! Because some protein is lost each time...antibodies on it if you plan to reprobe! Just as your sample protein is retained better, antibodies will stick...even if round two is just another attempt at the same target!). In the stripping step, you’ll remove the...

  2. Antibodies 101: Conventional vs Spectral Flow Cytometry

    Type
    Blog Post
    Published
    Aug. 3, 2023, 1:15 p.m.
    ...stained samples. If you are using conjugated dyes, it is critical that your controls and your sample antibodies...unmixing if your sample is stained with a PE/Cy7 antibody from a batch that is not the same as your single...fluorophore from another within a fully stained sample. Figure 2 is an example of the emission spectra...allows the user to use the autofluorescence in a sample as a fluorescent marker. Given that the level of... varies, it is critical to include an unstained sample for each tissue type you are running in your panel...control(s) Compensation or “reference” controls are samples stained with a single fluorophore. They’re required...antibodies are from the same batch, to avoid unmixing issues from batch-to-batch variation. Tandem dyes ...

  3. Deep Dive: qPCR

    Type
    Blog Post
    Published
    Sept. 29, 2022, 1:15 p.m.
    ...individual values match across the board. If the samples or sample conditions change, the multiplexed protocol...validation data, be aware that different machines, samples, and treatments may affect the assay. It’s unusual...everything should be denaturing or annealing at the same temperatures. If there are multiple amplicons, or... here, here, or here).  If you’re working with samples that have not been documented in the literature...reaction should be compared to an individually run sample when developing the protocol and optimized until...setting it up for larger or frequently analyzed sample types and sets.   🔥Hot Tip🔥 The ABI machines...an RQ value representing the fold change of each sample compared to your control. But as we said previously...

  4. Antibodies 101: Secondary Antibodies

    Type
    Blog Post
    Published
    Dec. 21, 2021, 2:15 p.m.
    ...approach is as follows: Prepare the sample. Incubate the sample with the primary (unconjugated) antibody...if all the primary antibodies are the same isotype from the same species, only one secondary antibody ...remove any unbound or excess antibody. Incubate the sample again with a conjugated secondary antibody, which...will need to be developed and optimized for the samples, antibodies, activation, and assay readout used...primary antibodies indiscriminately, giving them the same output signal. In these cases, it is best to use...not allow for absolute quantitative analysis of a sample. Instead, relative quantification can be done using...

  5. Antibodies 101: Polyclonal Antibodies

    Type
    Blog Post
    Published
    July 14, 2021, 1:15 p.m.
    ...recognize the same region, or epitope, of the target protein. These antibodies are also all the same isotype...heterogeneous mixture of many antibodies that recognize the same protein. In the immune system, antibodies are produced...peptide sequence derived from this protein. At the same time, an adjuvant such as KLH or Freund’s adjuvant...clones will still recognize your protein. For the same reason, they’re also useful in experiments where...experiment, you should either order several vials of the same lot of polyclonal antibody, or select a monoclonal...your polyclonal antibody, you’ll want to use the same positive control across experiments to be aware ... include a negative control using serum from the same species your polyclonal antibody was generated in...

  6. AAV Vector Quality Control: Going the Extra Mile with NGS

    Type
    Blog Post
    Published
    Sept. 12, 2017, 1:44 p.m.
    ... mean the sample is contaminated? No - what really matters is the number of hits to the same sequence ... DNA and processed the mixed sample in our pipeline (see Figure 2, sample 2). When we blindly analyzed...these known impurities, as was the case for clean sample AAV-44362. In addition to these expected hits, ...sequence (gene). In a clean sample, there are typically fewer than 10 hits to a given sequence, and we believe... the contaminant we mixed into the original AAV sample at 5%. Detecting 5% contamination is a good start...low we could go. We prepared a range of spiked samples from 0.1-20% and discovered that, with a high enough...

  7. Plasmids 101: Control Plasmids

    Type
    Blog Post
    Published
    April 9, 2015, 3:29 p.m.
    ...were derived from the same source and were incubated on the same plate at the same time. Although the replicate...separate wells (within the same plate) with purified plasmid from the same aliquot/preparation. The replicate...provide the baseline/standard against which other samples can be compared. The Empty Vector Control (mentioned...control in this experiment could be an shRNA—in the same backbone as Plasmid A—that does not target any mammalian...". Biological replicates are what makes up your sample size (aka your n value)" and should come from multiple...

  8. Multicolor Animals: Using Fluorescent Proteins to Understand Single Cell Behavior

    Type
    Blog Post
    Published
    March 5, 2019, 1:08 p.m.
    ...cell remains the same color for its entire lifetime and daughter cells retain the same color, allowing ...3.0 and using the same fluorescent markers, Brainbow 3.1 and 3.2 (described in the same publication) are...stage, meaning that neurons of the same lineage will express the same XFP transgene in an adult fly. As... that target these epitopes and fluoresce in the same color as the fused XFP can be used to amplify the...expressing YFP, CFP, and RFP are not present at the same frequencies. The small population size of CFP++ ...

  9. Evolution of Lab Techniques

    Type
    Blog Post
    Published
    June 21, 2016, 2:30 p.m.
    ...searching for), then the probe will bind to the sample thereby labeling it. The label can then be visualized...strength of the signal in comparison to a control sample. Southern blotting applications range from confirming... MstII and southern blotting are conducted on a sample from an individual without sickle cell anemia, ... largely replaced by real-time PCR to answer the same experimental questions. Real-time PCR detects and...DNA sequences to see which is more abundant in a sample. Whereas Southern blotting is labor intensive and...different restriction enzyme digests. Incubating a DNA sample of unknown sequence with restriction enzymes and...transcriptomes (RNAseq) require sequencing of many samples at once for later comparison. These next-generation...

  10. Antibodies 101: Epitope Availability

    Type
    Blog Post
    Published
    Jan. 11, 2022, 2 p.m.
    ...the researcher and ones that happen naturally.  Sample Denaturing  First, let’s think about induced conformation...frequently denature the proteins as part of the sample prep. This involves using heat and/or chemicals...that are available on the outside of the cell. The same protein may have different epitopes available if...help to visualize an abstract protein during your sample prep process, imagining how it starts and if any...has been validated for an assay that uses similar sample preparation - for instance, if you cannot find ...because they both typically use denatured protein samples. If, however, you are performing an immunohistochemistry...validate for recognizing the protein following your sample prep steps; ie, you may only need to validate on...

  11. RNA Extraction Without A Kit

    Type
    Blog Post
    Published
    March 24, 2020, 1:15 p.m.
    ...tissues, cells, plants, fungi, or bacteria, keep samples cold and work quickly to mitigate RNA degradation...180°C for at least 4 hours.   If your final RNA sample(s) are resuspended in water or TE buffer, store...requires a lot of time and depending on how many samples you may have, access to one or more large, expensive...thiocyanate-phenol-chloroform. In this method, samples are still homogenized and lysed in a guanidinium... above, working with RNA requires keeping your samples cold until homogenization and cell lysis. This ... market to choose from) on your resuspended RNA sample will help ensure DNA contamination is not an issue...issue.  References                 Allewell NM, Sama A (1974) The effect of ammonium sulfate on the activity...

  12. Developing Lab Management Software for Biology

    Type
    Blog Post
    Published
    Aug. 25, 2016, 2:30 p.m.
    ...appropriate glycerol stock within our freezers Pick the sample into the appropriate stab culture Grow the stab...proper location To keep ourselves from mixing up samples and to ensure that everything is grown successfully...fail. Some step failures require re-attempting the same step, some require going back two steps, some require...’s time for our lab technicians to retrieve the sample and get it ready for shipping. In the first case...and do troubleshooting on their own. For a few samples this isn’t so bad, for thousands it’s monumentally...arise if a lab veteran who worked with a particular sample suddenly left and didn’t have a system through ...transfer her instructions for dealing with the samples to newer lab members. We can set ourselves up for...

  13. Polymerase Chain Reaction Overview and Applications

    Type
    Blog Post
    Published
    Aug. 10, 2021, 1:15 p.m.
    ...scientific applications. These PCR methods all use the same basic PCR set up and steps but differ in how the... the presence of an insert or piece of DNA in a sample such as in colony PCR, or for generating mutated...determine the amount of starting material in your sample.  qPCR can also be used to quantitate RNA levels...droplet technology that fractions the PCR reaction sample into approximately 20,000 droplets. Each droplet...concentration of the original template DNA in the sample.  Addgene currently uses ddPCR for AAV titrating...concentrations of multiple starting DNA templates in one sample. It is important to note however, that multiplex...Multiplex PCR Amplify multiple targets from one sample Disease or pathogen identification SNP genotyping...

  14. CRISPR 101: Cytosine Transversion Editors

    Type
    Blog Post
    Published
    March 25, 2025, 1:15 p.m.
    ... around the same time. (The papers were actually published in the same journal on the same day.) This ... But the same strategy in E. coli produced different results. GBEs seemed to follow the same initial mechanism...repair pathways within the cell — in some cases, the same repair pathways that were considered problematic...converting the C base to uracil (U). This is the same chemical reaction performed by CBEs. However, most...create an abasic site. In this post, it refers to the same approach as a CGBE. BER Base Excision Repair A...

  15. Deep Mutational Scanning with One Pot Saturation Mutagenesis

    Type
    Blog Post
    Published
    Feb. 22, 2017, 3:30 p.m.
    ...These enzymes, Nt.BbvCI and Nb.BbvCI, recognize the same restriction site, but nick opposite strands of DNA...: The second mutant strand is synthesized in the same manner as the first mutant strand, but a universal...followed by the top strand. Both produced about the same number of positive clones. See Supplementary Note...primers? The key is to design primers that are the same sense as the strand of DNA degraded in the first...orientation of the BbvCI site(s) of the gene are in the same orientation as those in the plasmid. Again, if they...use a plasmid with BbvCI restriction sites in the same orientation as the gene or use custom gene synthesis...site or multi-site saturation mutagenesis with the same protocol. What do you think about one pot saturation...

  16. SARS-CoV-2/COVID-19 Detection Methods Based on CRISPR/Cas

    Type
    Blog Post
    Published
    May 5, 2020, 1:15 p.m.
    ...strip. Highlights: Of the 83 known COVID-positive samples tested, DETECTR has a positive prediction rate ...°C water bath Approach: RNA is extracted from a sample and subject to isothermal recombinase polymerase...uses a complementary crRNA sequence to bind to the sample and upon binding, gets activated. This activation... can be performed in two steps for challenging samples as in Two-Step-SHERLOCK or in a fast, high-throughput...previously developed method to detect SARS-CoV-2 in the samples. First, RNA is extracted and subject to reverse... cleavage. Highlights: Reverse-transcribed RNA samples are amplified by PCR instead of RPA. Unlike RPA...be visualised. Another approach was to apply the same concept to lateral flow strips that contain streptavidin...

  17. Antibodies 101: Introduction to Gating in Flow Cytometry

    Type
    Blog Post
    Published
    April 4, 2024, 1:15 p.m.
    ...When using flow cytometry to analyze your samples, it is necessary to set up a sequence of gates to be...the area under the resulting curve. By default, a sample on the flow cytometer (before you set the first...Practical example: lymphocytes in a mouse tumor sample You made it! So much about the theoretical background...gated out my lymphocyte population from a tumor sample. Many cell types can be found in the tumor microenvironment...proportion between H and A (or W and A) within the same type of scatter. Here I employed an FSC-H / FSC-...pattern of positive vs. negative signal remains the same (Figure 5).   A.                                                                                                        ...displayed. As the separation pattern largely stays the same and does not impact my ability to draw a proper ...

  18. Antibodies 101: Chimeric Antibodies

    Type
    Blog Post
    Published
    April 25, 2023, 1:15 p.m.
    ... are the same isotype and therefore cannot be indirectly probed simultaneously on the sample. What to ...because the pair belong to the same isotype and will react with the same secondary. If you were to change...that group. If you use two antibodies that are the same isotype then the secondary antibody will bind to... Figure 2: Two primary antibodies with the same isotype can not be used for multiplexed indirect...

  19. Live and Let Dye: Self-Labeling Protein Tags

    Type
    Blog Post
    Published
    April 16, 2024, 1:15 p.m.
    ...sequentially adding different ligands to the same sample to label sub-populations of your protein of interest...probably find lots of different plasmids containing the same protein of interest tagged with different fusion...affinity purification tags, another version with that same red fluorescent protein somebody made because they...ligands (Gautier et al., 2008). Although based on the same original enzyme, SNAP-tag and CLIP-tag show good... structures or low levels of expression with the same imaging workflows you already use. Or you can really...purified proteins in vitro, you can even use the same tag for multiple proteins but label each separately...

  20. Addgene Depositors Get More Citations

    Type
    Blog Post
    Published
    April 20, 2017, 2:30 p.m.
    ...This post was contributed by guest bloggers Samantha Zyontz and Neil Thompson from the MIT Sloan School... Under such circumstances, we would observe this same correlation, but it wouldn’t be causal. To control...Addgene deposits as if they were published in the same journals as those that did make deposits to Addgene...3 times as many citations as other papers in the same journals! So, is all this remaining difference caused...along the way. Many thanks to our guest bloggers, Samantha Zyontz and Neil Thompson. Special thanks to Addgenies...for helping compile the data used in this work. Samantha Zyontz is a Ph.D. candidate at the MIT Sloan School...
Showing: 61 - 80 of 505 results