We narrowed to 855 results for: nts

...the risk of such events, newer lentiviral packaging systems divide the viral elements among multiple plasmids...Replication competence can arise from recombination events during viral production and poses a biosafety risk...carrying the transfer gene. By dividing the viral elements across multiple plasmids, the risk of recombination...for transfection can make these optimization experiments a bit more challenging. With these considerations... thereby increasing the number of recombination events that are required to generate RCL. To overcome ...drive high levels of expression of certain viral components; according the manufacturer these changes result...lentivirus, the plasmids encoding the structural elements, envelope, and transfer gene are transfected into...

...measure these properties, and what fascinating experiments could push these tools even further? All of these...and find further tips for using FRET in your experiments here.     What is this FRET you speak of? Förster... acceptor In order for FRET to occur several constraints must be met. The donor and acceptor fluorophores...improved dynamic range for fluorescence lifetime measurements." PloS one 10.8 (2015): e0134436. PubMed PMID...the probe. More on these biosensors later on). Experiments using intermolecular FRET probes are typically...reference standards can be used to validate FRET measurements and serve as a type of positive control. In ...questions about cellular processes. Currently, FRET experiments can probe protein-protein interactions, measure...

... but these reagents and strategies are not available to those working with yeast or plants. Using MoClo...the basics of what MoClo is and what types of experiments it enables. What is modular cloning? Modular ...assembly. Simply put, it assembles individual DNA components into larger units or circuits with functional...and a ligase are used to assemble multiple DNA fragments together in a one-tube reaction. Even though most... test a variety of different orientations and components within the system to maximize production potential...multiplexed gRNA systems as well as additional components such as selectable markers, promoters, enhancers...is especially useful for more complex CRISPR experiments (e.g., many guides/parts delivered) in certain...

... Figure 1: SARS-CoV-2 proteins and other components. Image from Maya Kostman for the IGI.     ...COVID-19 research in other labs. Spike protein, variants, and pseudotyping The SARS-CoV-2 virus depends...cellular receptor. To more easily study the spike variants, scientists have developed ways to pseudotype ...lab. Jesse Bloom’s lab published a protocol and reagents for pseudotyping lentivirus with the SARS-CoV-... has had many opportunities to evolve. Several variants are now circulating and plasmids containing these...pseudovirus and those encoding different spike protein variants that can be incorporated into pseudoviruses. The...at neutralizing the different SARS-CoV-2 spike variants. You can learn more about their research in this...

...decisions. In my work as a thesis coach for graduate students, I heard about supervisors in all of the above...also considering the needs of other people. Some students and postdoctoral fellows are hesitant about expressing...help you to become more assertive and resolve disagreements with your supervisor, even if he or she is a...will meet both of your needs. 6) Put important agreements in writing One of the most frequent sources ...approximate timelines. Be sure that you keep your commitments, and if for some reason you are not able to, ...they can count on you to follow through on your commitments. Assertiveness is a skill that will help you ...supervisors might try to intimidate you with negative comments (hostile-aggressives, complainers, know-it all...

...technologies have transformed the palette of experiments possible in a wide range of organisms and cell.... elegans approaches rapidly enrich for editing events without the need for any selective marker to remain...the awesome power of genetic selection. Knock-in events tend to be rare, and the challenge with any experiment...in any genetic background, but require variable amounts of experimental manipulation and screening.  A ...screening 768 F1 animals). Recovering rare editing events in a sea of unedited animals struck me as a “needle...into the homologous recombination repair pathway. Reagents required to perform pha-1 co-conversion are available...knock-ins (Ghanta et al., 2020). Together, these improvements from the Mello lab resulted in strikingly high...

...education? Let us know about your educational events in the comments section below! Additional Resources Visit...Last week, 20 students and four chaperones from Denis-Yarmouth Regional High School visited our labs ...Learning about careers at Addgene Afterwards, the students split into two groups for an in-depth look at ...Biology Lianna Swanson was very popular, with the students excited to see a real working lab full of busy...Operations Coordinator: “Kory was awesome!”. The students also got to learn about intellectual property ... technology was a rousing success! Many of the students were interested to see so many different career...such a great day, we look forward to hosting more students next year! Does your lab or organization do work...

...majority of the respondents (70%) used a lipofectamine-based method to deliver NgAgo ingredients into the cell... questions about the NgAgo protocols used by respondents (transfection method, amount of each component...successful indel formation at a target site. Also, 41 respondents attempted to use the technique for epitope tagging...Survey The take-home message While most of the respondents have been struggling to achieve genome editing...generation and epitope knockin was achieved by a few respondents suggesting that NgAgo can indeed be optimized... take-home message thus far, based on survey respondents "Final Verdict", is that more time is required...Addgene Blog - Leave suggestions and tips in the comments section below or contact [email protected] if you'd...

...Spiking your media with supplements such as magnesium salts, buffering agents, and/or supplying additional...Use a strain optimized for plasmids with repeat elements, such as viral plasmids with inverted terminal... and prep high quality DNA that contains these elements. Be aware of endA+ strains Strains like Stbl3 ...including HB101 and derivatives, release large amounts of carbohydrates that can inhibit the cell lysis...of protein, not plasmid DNA. If you need large amounts of DNA from a plasmid in a protein expression strain...culture media Changing to a richer media or adding supplements can improve your cell density, leading to an ...normally recommended antibiotic concentration. Add supplements to the media You can achieve higher cell density...

...phenotype can lead to a wealth of additional experiments investigating the role of individual genes or...carry out so-called “forward genetic screening experiments”, it is certainly the most robust. In this blog... genome-wide screens and highlight some of the reagents that have been made publicly available through... and versatility. CRISPR/Cas9 consists of two components: the non-specific endonuclease (Cas9) and a single...72005145@N00/5600978712/ What CRISPR-based reagents are available for genome-wide screens? The goal...gRNA-containing plasmids. CRISPR genome wide-screening experiments commonly use lentivirus to deliver a pooled population... mind that libraries are only as good as the experiments you use them for! A well-developed biological...

...of an objective you have, you can’t resolve two points within ~250 nm of each other. For reference, individual...most SRM techniques also require specialized instruments and technical expertise, limiting their accessibility...relative positions, allowing you to resolve individual points with a conventional, diffraction-limited light ..., ExM protocols utilize relatively inexpensive reagents and are readily adoptable by labs already familiar...will link biomolecules to the gel and add gel components to polymerize. Step 3: digest the sample to allow... “super-resolution” technique that uses common reagents, straightforward protocols, and standard microscopes...isotropic expansion depends on how well the gel components penetrate the sample, how well the gel polymerizes...

...scheduling was in part defined by both the number of participants and the standard academic calendar. So you want... their schedules and read the paper (PS: All participants should read the paper ahead of time!). This ...rather than diving deep into the individual data points. All formats should be an open forum where people...figure) if the primary purpose is training graduate students in critical reading. If the aim of the journal...and other subsequent meetings. The number of participants, breadth of the discussed topic, and level of...has lost both its focus and critical mass of participants. This is especially true of journal clubs where...projects have taken on a larger priority for the participants. Perhaps people feel confident in their own ...

...dyes. Acknowledgements I thank Brett Mensh, a wordsmith soldier of fortune, for helpful comments. Many...reverting” to small molecule dyes seems daunting—no one wants to spend their days microinjecting fluorescent conjugates...easier and more functional in complex biological environments such as live cells and tissues (Figure 1). These...activating proteins (FAPs) – These modified antibody fragments bind and enhance small molecule fluorogens (Figure... cell permeability. In past decades, further refinements to this established dye structure have yielded...living cells, especially for advanced imaging experiments. We continue to develop derivatives that have...for many (if not most) fluorescence microscopy experiments. However, when your budget gets a bit thin, small-molecule...

...proteins are provided in trans (see Other Important Components of EBOV Minigenome System). However, minigenomes...RNA viruses (reviewed in 2, 3). Other important components of the Zaire ebola virus minigenome system Similar...plasmid with all four genes and necessary control elements for each would be relatively large. Cloning the...useful research tools. In addition to the reduced requirements for biocontainment precautions, these systems... can be examined independently. In addition, experiments can be performed in the absence of some viral...efficiently transfected into cells. All of these components are necessary to efficiently reconstitute a functional...cell lines that are highly transfectable.  The amounts of each plasmid transfected into cells are also...

...way Fun events don't have to cost a lot, or anything at all really! We've had plenty of events that included...throw in some passion for our mission to share reagents with scientists around the globe, the end result...effort to continue the tradition and plan enjoyable events for employees. We now have a team of three (myself...myself included) that plan big company events and fun things to do throughout the month. Although we are...building activities a priority and have organized many events over the years. To keep the organizational side...Tips! 1. Take suggestions Some of Addgene’s best events have been at the suggestion of an employee, or ...outside of your ordinary environment Team building events like Escape the Room or Habitat for Humanity take...

...designed 2 variants of EosFP that can withstand these conditions- mEos4a and mEos4b (12). Both variants are ... random mutagenesis screening for enhanced RFP variants. PA-mCherry (E26V / A58T / K69N / L84F / N99K ...respectively. When illuminated with violet light, both variants are photoconverted to forms that emit brighter...temperature below 30°C and this is not ideal for experiments in mammalian cells. Dendra2 is another monomeric...PA-FPs. Several other irreversible PA-FP spectral variants have been discovered such as Kaede and PS-CFP2...protein for your experiment Similar to performing experiments with standard FPs, before choosing a PA-FP for...even begins! If you are performing multicolor experiments, you will want to be sure that the light used...

...with different fusion proteins for different experiments over the years — a green fluorescent protein,...choose different colors or ligands for different experiments without having to clone a whole new construct...Live-cell labeling strategies. The green structure represents a fluorophore or other useful ligand, gray structure...HaloTag is actually HaloTag7, and recent specialized variants run up to HaloTag11. HaloTag is now the most popular...the results right away. Or perform pulse-chase experiments by sequentially adding different ligands to the...between different colored ligands at different time points.   Figure 3: Single-molecule tracking of...assembly-regulating proteins in vitro reveals complex events. a) Micrographs of a fluorescently-labeled actin...

...processes enabling organisms to control their movements and behavior. These functions and others are controlled..., that facilitate immunohistochemistry (IHC) experiments with tag-specific antibodies. The most famous... cannot be detected directly in live imaging experiments. It is therefore difficult to use epitope tags...fluorescent and can therefore be used in live imaging experiments crucial to studying neuronal circuits and dynamics...protein localization, isolation, and tracking experiments (Rizzo, 2009). With many different FPs that emit...researchers can also use multiple FPs in single experiments and visualize numerous molecules or structures...only a single channel. In multi-color imaging experiments, the second color is usually provided by red ...

..., including investigations into environmental pollutants and health, embryo growth, brain function, and...visualize expression data in useful ways. Zebrafish mutants In the 1990’s, two revolutionary large-scale random... mutagenesis screens produced ~1,500 zebrafish mutants that are still used in labs across the globe (Nüsslein-Volhard... in congenital heart defects and cancer. These mutants are used extensively to study development and disease... Database ZFIN actively curates information on mutants and other resources. Targeted gene deactivation...deactivate genes without spending months generating mutants. Unexpectedly, phenotypes sometimes differ depending...embryogenesis live. The origins, divisions, and movements of each of the thousands of cells in the developing...

...researchers and PhD students. Everybody in science knows that there are many ways your experiments can go wrong...researcher doing some experiments in Brazil can have the same issues as one doing experiments in France. We can...samples, or a dysregulated water bath boiling your experiments, just about anything can disrupt your bench work...research. Find Protocols Lab Tips to Keep Your Experiments Running Smoothly and "Gnome-Proof" This is why...laboratory has never faced an odd situation with experiments? Our art simply mirrors our lives at this point...discovered that it can be good for you and your experiments to think outside the box, be creative, and put...