...viral genome and the absence of unexpected DNA contaminants. The data is also used to determine recombination...properties of the final vector preparation, the quantity of gram-negative bacterial endotoxin is ensured...within representative vector preparations was quantified with electron microscopy after negative staining...Approximately 2 weeks post-thaw, cell culture supernatant is tested for mycoplasma contamination. To date...

... What are toxin-antitoxin systems? These toxic substances are part of toxin-antitoxin systems that are... while the antitoxin is unstable, meaning that the cells must continually produce antitoxin to avoid cell...will still inherit some toxin and antitoxin. However, the antitoxin will be degraded leaving the cell ...applications. The discovery of toxin-antitoxin systems Toxin-antitoxin systems were first discovered in 1983.... The encoded toxin-antitoxin system consists of CcdB (toxin) and CcdA (antitoxin) where CcdB inferes ...higher percentage of transformants contain the ccdB-less construct. Other toxin-antitoxin systems and their...-based toxin-antitoxin systems. One of the most well known protein-based toxin-antitoxin system is MazE...

...third Addgene/Seeding Labs plasmid grant and plans to use the grant to order plasmids she can use as positive...the Addgene/Seeding Labs Plasmid Grant to a third round of applicants at the start of 2017 and would like...in PCR-based cervical cancer screens. This third grant represents the continuation of our efforts to provide...Bengyella and Kwabena Duedu who were awarded similar grants back in June, Gladys will be using plasmids in ...caused by persistent infection of HR HPV types, predominantly HPV 16 and 18.” HPV plasmids as positive controls...Superhero 5k Find New Cancer Resources Learn About Our Grants to Rare Disease Research Resources on Addgene.... seeding labs plasmid grant...

...these enzymes implies that even a minute quantity can significantly reduce the operational time for a given...efficiency.  Finding recombinant psychrophilic enzymes for the host The expression of recombinant proteins for... contained cold tolerant chaperones (the Cpn 10/60 isolated from Oleispira antarctica, and the P. haloplanktis... psychrophilic proteins. The primary problem we wanted to overcome was inefficient protein folding at ...well under suboptimal conditions. This means recombinant proteins can aggregate or precipitate out as ...would allow the stable folding and expression of recombinant psychrophilic proteins. As the figure below shows.... And thus was born ELSA - our happy lil’ cold-tolerant E. coli! Additionally, we’re also working towards...

...about and jumping into the discussion! Semantic Scholar Semantic Scholar is an AI-backed literature search...Intelligence. Semantic Scholar analyzes publications and figures using machine learning to extract important features...return results that are more relevant to your search terms. Key features Semantic Scholar has several ways...millions of them. The real challenge is finding relevant papers. The latest installment of the Early Career...to find papers  You’ll need to start following relevant accounts in order to turn Twitter into a paper-finding-machine...keywords. It’s sort of like a keyword search that’s constantly updated. This Twitter list contains >300 Twitter...at the top of this filter. A unique feature of Semantic Scholar search results are the topic pages, which...

...competitive ELISA use antibodies coating the wells to capture antigen from a sample, whereas antigen is bound directly...as a reference antigen — that can also bind to that antibody. Then, the protein-antigen mixture is added...multiple secondary antibodies can bind to a single primary antibody. The secondary antibody is conjugated ...blog Learn about the advantages and disadvantages of using monoclonal antibodies. Read about other techniques...that any antigen within a sample adheres to the well (either directly or by binding to an antibody that is... coated with the antibody. Then, you add your sample to the wells, and the antibodies bind to your protein...is the addition of a detection antibody (typically a monoclonal antibody) that also recognizes the same...

...Fragments. Antibodies 2:193–208 . https://doi.org/10.3390/antib2020193  Khantasup K, Chantima W, Sangma...Comparison between the IgG antibody and scFv.   What are the advantages and disadvantages of a scFv vs. a monoclonal... monoclonal antibody? Advantages of scFvs: scFv’s advantages are rooted in their size. Being smaller means...the ways antibodies are. scFvs are even used to screen for new antibodies. To do this, antibody variable...vector encoding the antibody constant domain scaffold to convert the scFv into an antibody.  The ability to... Prospects of Antibody Fragments. Antibodies 8:28 . https://doi.org/10.3390/antib8020028  Bird R, Hardman...When you think of antibodies, you probably think of monoclonal antibodies (mAbs). mAbs have been around...

...use two antibodies - one against your target of interest and a second against the first antibody. When ...same species as your primary antibody are present, your secondary antibody recognizes both the endogenous...endogenous IgGs and your primary antibody, resulting in significant background staining (Figure 1A). Not all...because the secondary antibody is not able to distinguish between the primary antibody and endogenous IgGs...secondary antibody bind endogenous IgGs? Don’t use one. If it is possible, using a primary antibody that is...and secondary antibody complexes (Figure 2B) Some labs have found that you can significantly decrease background...samples as homogeneously as a single antibody. Using a secondary antibody that is a Fab fragment, single-chain...

...controls needed for relative quantification of a western blot — and why you might want to be careful relying ... Loading controls are even more important for semi-quantitative western blots. No pipetter is perfect...blotting quantification” (Gilda & Gomes, 2013). To address this source of error, it’s important to determine... on so called “housekeeping proteins.” Fully quantifying a western blot requires a standard curve with...cases. Often, you may not need to know the exact quantity of your POI, but simply whether its concentration...experimental parameters. This is a job for a semi-quantitative western blot. Most western blots benefit from...accurately compare different lanes? In relative quantification, the POI bands are normalized to the loading...

...step where the target antigen binds to antigen-specific antibodies. The antibodies are conjugated with ... then adds an antigen-specific detection antibody.  Importantly, the detection antibody and the capture...Addgene blog Antibodies 101: ELISAsAntibodies 101: Selecting the Right Antibody Antibodies 101: Polyclonal...Polyclonal Antibodies Resources on addgene.org The Addgene Antibody GuideAddgene's recombinant antibody collection...primary antibody first binds to the antigen and then a reporter enzyme conjugated secondary antibody binds... to the antigen in a sample and then a second detection antibody binds. The detection antibody can be ...The more antigen in the sample, the less antibody available to bind to the competing antigen. In direct...

...fluorophore-conjugated antibodies that attach to a specific target. By using a mix of different antibody-fluorophore...a conjugated antibody to detect CD45, and I'll need to choose the fluorophore my antibody is conjugated...the Addgene blog Antibodies 101: Introduction to Gating in Flow Cytometry Antibodies 101: Flow Cytometry...Cytometry Antibodies 101: Flow Compensation Resources on Addgene.org Addgene's Antibody Guide Ready-to-use ...Ready-to-use antibodies in the Addgene repository Antibody Protocols ...distinguishing live from dead cells. The combination of antibody-fluorophores, fluorescent reporters, and/or dye...excitation and emission wavelengths, it is also important to know the brightness of individual fluorophores...

...computational pipeline that enables accurate quantification and visualization of CRISPR-Cas9 outcomes, ...off-target sites. This algorithm allows for the quantification of both non-homologous end joining (NHEJ) and...experiment a reference amplicon sequence to assess and quantify the efficiency of the targeted mutagenesis The...mutations. Coding sequence/s may be provided to quantify frameshift and potential splice site mutations...

...some plant-specific changes to CRISPR components are necessary to enable genome editing in plant cells... allow for the use of CRISPR in plants, and outline the various plant genome engineering tools that are...system in plant cells. Like other model systems, expression of S. pyogenes Cas9 or Cas9 variants (hereafter...question. In plant cells, gRNA expression is achieved by placing the gRNA downstream of a plant-specific ...optimized Cas9 variants have been created in an effort to increase translation in a particular plant species ...target genes in plant cells, respectively. Cas9 expression is commonly driven by plant-derived RNA pol... editors have been developed for plants and prime editing for plants has been developed for rice by Yiping...

...requires the presence of dsRNA. In plants, CRISPR technologies are predominantly used to disrupt function at ...from an easy method to identify and quantify actively silencing plants. Non-destructive methods, most popularly...silencing plants can be easily identified and have readily observable phenotypes quantified. Fluorescent...designed and widely implemented in plants, such as in the model flowering plant Arabidopsis thaliana (Li et ...possible in plants outside of limited, single cell protoplast analysis. Instead, microscopic plants must be...consuming, as RNAi mutants with a reduced growth phenotype will require additional plants to have enough ...MicroRNA Screens for Effective Gene Silencing in Plants. Plant Cell 25:1507–1522 . https://doi.org/10.1105/...

....  In conclusion, it is important for you to establish in advance how you want to utilize your plasmid...purifying a plasmid from a bacterial culture, it is important to consider your experiment.  It will dictate ... a set of techniques that are used to insert recombinant DNA from prokaryotes or eukaryotes into a synthetic...approach you choose ultimately will influence the quantity of DNA that is required and, as a consequence,...To allow efficient and flawless cloning it is important that the preparation is pure from other nucleic...(genomic DNA and RNA), proteins and chemical contaminants that have been used during the purification ...scientists an indication of purity versus protein contaminants. The 260 and 230 nm ratios should fall ~2 - ...

...Other labs have used PCR-based screening to detect mutants, but this method limits screening to a few hundred...

...a monoclonal antibody against a target antigen. This contrasts with polyclonal antibodies, which are mixtures...a repository for monoclonal antibodies, distributing over 3,000 antibodies and associated hybridoma cell...distributing monoclonal antibodies at cost. We distribute over 65,000 antibody units per year from our...monoclonal antibodies, which are each produced by a single B cell. To create a monoclonal antibody cell line... of monoclonal antibodies obtained from serum.  Our most popular monoclonal antibodies include those ...Monoclonal Antibody Research Institute dedicated to: 1) developing new ways of generating antibodies, for example...through the use of less toxic adjuvants; 2) generating complex antibody chips that allow assessment of...

... genomes so as to make plants, and agricultural crops in particular, resistant to disease. They also devise...them. The MoClo Plant Kit makes it really easy to clone genes for expression in plant cells. Sylvester... lot. The problem in plant science is there is a paucity of resources. We wanted to expand the toolkit...also gives quantitative data for regulatory elements, which has not been available for plants. Addgene:...tools for editing plant genomes. We will definitely plan to share those tools with the plant community. We...Remember plants. Every time you look at your plate, think about how much that’s on it are plants, and the...animals you eat ate plants too. Think about how many people are starving. I think plant biology is massively...

...tags, can be used for enChIP, as well as an anti-Cas9 antibody. Biotin tagging of dCas9 can be achieved ... gRNAs By Species Mammalian Bacteria Drosophila Plant C. elegans Yeast Zebrafish Xenopus CRISPR Resources...

...gene of interest and keeping its expression level constant. In the case of the stabilized promoters from ...expressed. What’s the use of stable gene expression? Constant gene expression can enable more confidence in ...Christopher A. Voigt. "Engineered promoters enable constant gene expression at any copy number in bacteria...