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We narrowed to 800 results for: cha;

Showing: 181 - 200 of 800 results

  1. Tetbow: Bright Multicolor Labeling for Neuronal Tracing

    Type
    Blog Post
    Published
    Jan. 24, 2019, 2:24 p.m.
    ...Leiwe and Takeshi Imai from Kyushu University. Stochastic multicolor labeling is a powerful solution for...microscopy-based neuronal reconstruction. To achieve stochastic multicolor labeling, Brainbow used the Cre-loxP...copies of the transgene cassette are introduced, stochasticity will result in a combinatorial expression of...Brainbow was inherently low. This is because the stochastic and combinatorial expression of fluorescent proteins... such vector-based gene delivery systems, the stochastic expression of XFPs is possible by simply introducing...introducing a mixture of XFP genes. Stochastic multicolor labeling is possible when each of the XFP genes...

  2. Rewiring Metabolic Circuitry with CRISPR RNA Scaffolds [Video]

    Type
    Blog Post
    Published
    April 7, 2015, 4:21 p.m.
    ...However, these approaches are often met with the challenges of regulatory bottlenecks and their scope is ...is limited by the lack of well characterized inducible promoters. Far removed from the bio-industry’s vision... various metabolites in Escherichia coli or Saccharomyces cerevisiae with few techniques that are easily...designed scaffold binding sites. With hundreds of characterized aptamer domains available, an unprecedented .... This strategy can be applied to effectively change metabolic flux. The dCas9 protein and orthogonal...6441/ Resources: An open source library of characterized aptamers and supporting publication: http://...

  3. Hot Plasmids: FRET-Based Biosensors

    Type
    Blog Post
    Published
    May 6, 2014, 1:07 p.m.
    ...they change color as they shift from "off" to "on" in the presence of calcium. This color change can be...problem that he considers “one of the greatest challenges of neuroscience.”  Hot plasmids: Twitch sensors...imaging neurons, Griesbeck adds that this color change has a particular advantage for observing events...sensitivity. As reported in Nature Methods, the FRET changes of these Twitch sensor variants were optimized ...trial and error. Transition metals also present challenges in that they are found in cells at much lower...

  4. Mycoplasma Contamination: Where Does It Come From and How to Prevent It

    Type
    Blog Post
    Published
    Oct. 8, 2020, 1:15 p.m.
    ...through filtration methods because of its ability to change shape and the absence of a rigid cell wall. Here.... For testing, the medium should not have been changed for at least two or three days before sampling ...chemical reactions and this induces a noticeable color change. This method has high sensitivity but low specificity...specific enzymes are used which trigger cellular mechanisms that generate luminescence. This can then be ...are working without gloves or masks. Make sure to change the gloves and masks regularly instead of keeping...water provided to maintain the humidity should be changed regularly as mycoplasma, bacteria, and fungus can...Mycoplasma Contamination in Cell Cultures by Polymerase Chain Reaction. In: Methods in Molecular Biology. Humana...

  5. Virtual Science Conference Coming Up? Three Addgenies Share Their Experience

    Type
    Blog Post
    Published
    June 30, 2020, 1:15 p.m.
    ...questions in the chat box. That’s another benefit to note-taking: you can revisit the Q&A in the chat box. Presenting... plan more with regard to my interests.” Use the chat box and upvote If the thought of walking up to the...asking questions using the polling feature or the chat box. One key thing to remember regardless of the...poster,” he says.Viewing a poster on a screen is challenging, requiring you to zoom in to different parts ...than in-person. You might miss out on the short chats between sessions or waiting for a session to start...

  6. 15 Hot Plasmids from 2017

    Type
    Blog Post
    Published
    Jan. 9, 2018, 3:02 p.m.
    ... simultaneously   Researchers in the labs of Michael Lin and Ryohei Yasuda have teamed up to develop...maturation. Three new RFPs were isolated and characterized: mScarlet (fluorescent lifetime of 3.9 ns, quantum...member of this class that works via a different mechanism - the PhoCl protein is irreversibly cleaved when... also provided a detailed protocol at Protocol Exchange. Plasmid maps can be found at Addgene and in Figure...Gram-positive bacterium, many of its genes are poorly characterized. The Gross lab hopes these libraries will be...Transcription factor fusions elucidate iPSC reprogramming mechanism The Ptashne lab was the first to demonstrate ...used this now classic technique to elucidate the mechanism by which SOX2 acts to reprogram human fibroblasts...

  7. Form Your Own Peer Mentoring Group: A How-To Guide for Scientists

    Type
    Blog Post
    Published
    Feb. 18, 2014, 4:22 p.m.
    ...years. They helped one another navigate career changes and overcome barriers by sharing broader perspectives...Healthcare Businesswomen’s Association (HBA) Boston Chapter and the Massachusetts Association for Women in ...diversity of input and perspectives Provides a good mechanism for accountability that makes mentoring effective... heard from peer groups meeting at both the Fox Chase Cancer Center and Brandeis University. 5 easy steps...choosing a topic and leading the discussion. This is a chance to practice leadership and communication skills...better with process, so don’t just get together and chat. Have an agenda and get everyone ready for the discussion...

  8. Hassle-free 96-well Format Epitope Tagging Using Cas9 Ribonucleoprotein

    Type
    Blog Post
    Published
    June 28, 2018, 3:01 p.m.
    ...Creating epitope-tagged clonal cell lines remains a challenge as it relies on inefficient homology-directed ...representing a protein super family). To overcome these challenges, we set out to develop a hassle-free, highly ...Technologies, USA). These synthetic RNAs can also be purchased from various other suppliers with a typical turnaround...straightforward as the RNA molecules can be directly purchased and there is no need to construct plasmid vectors...; this was possible because reagents could be purchased directly from commercial suppliers without investing...template) and use homology arms of 60 -70 bp . Purchase gene-specific crRNAs and matched ssODNs from commercial...by single-cell deposition in 96-well plates: Characterize clonal lines by ICC and PCR genotyping (Sanger...

  9. Which Fluorescence Microscopy Technique is Best for Me?

    Type
    Blog Post
    Published
    Oct. 10, 2017, 1:57 p.m.
    ...Many thanks to our guest blogger, Doug Richardson! Doug Richardson is the Director of the Harvard Center...This post was contributed by Doug Richardson, Director of the Harvard Center for Biological Imaging and...microscope designs may further exploit the unique characteristics of fluorophores to block out of focus fluorescence...blurry out-of-focus light. The most difficult characteristic to capture in these types of samples is their...model embryos >15 μm Thsee are some of the most challenging samples to image as they require both optical... 2, 932-940 (2005). PubMed PMID: 16299478. 9. Richardson DS, Lichtman JW. Clarifying Tissue Clearing. ...

  10. The Breast Cancer Microenvironment: A Tumor’s Backstage Team

    Type
    Blog Post
    Published
    Jan. 31, 2019, 1:32 p.m.
    ...lack of caveolin 1 in breast cancer also induces changes of stromal cells in the microenvironment. This ...from cancer cells to the microenvironment. This mechanism happens for both short and long distances. When...transferred to other cells, inducing epigenetic changes in targeted cells. In this case, exosomes may transport...extracellular matrix and fibroblasts. With each cell mechanism discovered in microenvironments, we are one step...References Allinen, Minna, et al. "Molecular characterization of the tumor microenvironment in breast cancer...Intercellular nanovesicle‐mediated microRNA transfer: A mechanism of environmental modulation of hepatocellular ...

  11. Hot Plasmids April 2018 - Protein Degradation, Nanoscopy, FIRE-Cas9, and Yeast Expression Tools

    Type
    Blog Post
    Published
    April 23, 2018, 2 p.m.
    ...and RNA expression - but what if you just want to change protein levels? Until recently, no such tool existed...proliferation. These cells also did not contain changes in expression of TRIM21-associated genes, indicating...the first author of this article, Dr. Douglas Richardson, recently contributed a relevant post to the ...Addgene blog. Find the SRpHi Biosensors here. Richardson et al. Nat Communications. 2017. PubMed PMID:...transcription factors in series and independently changes inducer levels. That is, if transcription factor...expression of a reporter protein, it is possible to change the amount of noise in reporter gene expression...

  12. A New Generation of Adenine Base Editors Improves Editing in Primary Human Cells

    Type
    Blog Post
    Published
    May 7, 2020, 1:15 p.m.
    ...•T-to-G•C base changes (Figure 1), but it can be challenging to make these base changes, especially in...hemoglobin. Previous studies have shown that one base change in the promoter region of gamma hemoglobin (HGB1...effects. ABEs have been described to introduce base changes in cellular DNA and RNA dependent or independent...authors tested ABE8.17-m and found that one base change mutation (ABE8.17-m+V106W) (Gaudelli et al., 2020...

  13. CRISPR 101: Targeting Non-Coding RNAs with CRISPR/Cas9

    Type
    Blog Post
    Published
    Nov. 14, 2024, 2:15 p.m.
    ...in comparison to protein-coding genes (Rinn and Chang 2012). Scientists have determined the function ... Chylinski K, Fonfara I, Hauer M, Doudna JA, Charpentier E. A Programmable Dual-RNA–Guided DNA Endonuclease...CRISPR-Based Approaches for the High-Throughput Characterization of Long Non-Coding RNAs. Non-Coding RNA. 2021.... doi:10.3390/ncrna7040079 Horlbeck MA, Liu SJ, Chang HY, Lim DA, Weissman JS. Fitness effects of CRISPR...(5):573. doi:10.1038/s41587-020-0428-0 Rinn JL, Chang HY. Genome Regulation by Long Noncoding RNAs. Annual...in Plants with the CRISPR-Cas Technology is a Challenge yet Worth Accepting. Front Plant Sci. 2015;6. ...

  14. A Needle in a Base-Stack: Cas9 Structural Biology

    Type
    Blog Post
    Published
    June 4, 2024, 1:15 p.m.
    ... heteroduplex is cradled in the positively charged channel between the two lobes. For CRISPR to be programmable...light blue; bridge helix, purple.   Apo Cas9 changes conformation frequently (Osuka et al., 2018), but...structure, reflecting the less stringent recognition mechanism that can tolerate mismatches in this region. The...in the duplex that may not fit properly in this channel, depending on their precise location. The end of... BioRender.com.   The exact conformational changes that make Cas9 such a valuable laboratory tool ...Doudna, J. A. (2017). CRISPR-Cas9 Structures and Mechanisms. Annual Review of Biophysics, 46, 505–529. https...

  15. Common Injection Routes in Mice

    Type
    Blog Post
    Published
    Jan. 22, 2025, 9:42 p.m.
    ...institutional oversight is required. Restraint: mechanical restraint or anesthesia Location: tail vein or...you might after getting a vaccine. Restraint: mechanical restraint Location: thigh Gauge: 25–27 Volume...xenograft models. Restraint: back scruffing or mechanical restraint Location: back or hind legs Gauge: ...Restraint Location Gauge Volume Skill Intravenous Mechanical restrainer or anesthesia Tail vein or retro-orbital...cavity 25–27 < 2–3 mL Intermediate Intramuscular Mechanical restrainer Thigh 25–27 < 0.02–0.05 mL Beginner...Beginner Subcutaneous Back scruffing or mechanical restrainer Back or hind legs; between skin and muscle...

  16. Addgene's Cancer Collection Pages Connect the Research Community

    Type
    Blog Post
    Published
    Sept. 6, 2016, 2:30 p.m.
    ...cancerous cells Luckily, there are several safety mechanisms in place to protect us from rogue cells when ...programmed cell death, or apoptosis, is one such mechanism. When a cell or its genetic material is damaged...daily, yet obstacles remain. One of the biggest challenges facing researchers today is the complexity of... of the latest resources? In response to this challenge, Addgene has launched an initiative to curate ... your thoughts in the comments section below. Michael G. Lemieux is a Scientist at Addgene with interests... Michael G. Lemieux...

  17. CRISPR 101: Making a Knock-In Cell Line

    Type
    Blog Post
    Published
    Dec. 22, 2022, 2:15 p.m.
    ...Disable the other repair mechanisms Mammalian cells have 2 primary repair mechanisms besides HR - Non-homologous...mammalian cells, but a less frequent DNA repair mechanism in general. On average, it accounts for less than...is a silent mutation, so you don’t accidentally change your protein of interest.   Fig. 2: Stop...potentially shuttling repair down a different pathway (Charpentier et al., Nat Com).     Fig. 3: HDR events... 8(2024), (2017). 10.1038/s41467-017-01836-2 Charpentier, M., Khedher, A. H. Y., Menerot, S., Brion, A...

  18. Introducing Addgene's New Search - Find Plasmids More Easily For Your Research!

    Type
    Blog Post
    Published
    Dec. 3, 2019, 11:38 a.m.
    ...Did you notice the “Filter By…” options changed when we changed from searching for viral preps instead ...best plasmid for your research can be a daunting challenge. With over 80,000 deposited plasmids from around...assembled a series of screenshots to highlight changes to both the design and functionality of searches...of plasmids? The available filtering options now change dynamically based on the type of material and specific...you may find the available categories and filters change as we now only show options relevant to your current...

  19. Cpf1: A New Tool for CRISPR Genome Editing

    Type
    Blog Post
    Published
    Oct. 14, 2015, 2:30 p.m.
    ...again and possibly mediate HDR. This “second chance” mechanism might improve the frequency of desired HDR...al. added to the CRISPR toolbox with their characterization of two Cpf1 orthologs that display cleavage...requirement. Zetsche et al. started from square one to characterize the Cpf1 nucleases. Using Francisella Cpf1 (...elements of CRISPR-Cpf1, Zetsche et al. turned to characterizing its cleavage pattern. Again, they were in for...efficiency. Kim et al. and Kleinstiver et al. characterized genome-wide editing efficiency of two Cpf1 orthologs...

  20. Bioinformatics at Addgene

    Type
    Blog Post
    Published
    July 14, 2022, 1:15 p.m.
    ...on-site, but now we were presented with a new challenge: automating the bioinformatics steps needed to...input to the next via a Nextflow concept known as channels. Since a Nextflow process can utilize any scripting...process.  Next, we specified the input and output channels for the initial process and tested it by running...number of input file names or filtered the input channel to only use the first n items. To be sure, we went...first, to make sure we understood the concept of channels and implemented the input declaration correctly...faster runtime and decreased cost compared to purchasing and maintaining our own infrastructure. Our patchwork...
Showing: 181 - 200 of 800 results