We narrowed to 877 results for: tra

...sample to that of a standard curve to extrapolate the concentration of antigen in the sample. A variety ...chemiluminescent substrates are available. Labs with limited equipment often opt for the chromogenic substrates since...For enzymatic signal detection, users provide a substrate that the enzyme converts into a detectable product...antibody. The reporter reacts with a provided substrate and produces a signal that is directly proportional... present in the sample and is calculated by extrapolating from the standard curve. Because the primary...enzymatic reaction between the detection antibody and substrate is proportional to the amount of antigen present...present in the sample and is calculated by extrapolating from the standard curve. Scientists often opt for...

...?  Plasmids 101: Transformation, Transduction, Bacterial Conjugation, and Tranfection...genes necessary for transfer initiation between bacterial hosts. Also, self-transmissible plasmids may have...determined by the different hosts that a plasmid can transfer to, replicate in, and persist in. Some plasmids...easily cloned in different bacteria, and can be transferred to various experimental hosts (Jain and Srivastava...scientific community, as they allow for simplified transformation processes, and can be used by scientists across...past this checkpoint.  The plasmid is self-transmissible, meaning that the plasmid is conjugative and...

...best gRNA Figure 1: Validation of double strand break (DSB) mediated homology dependent repair ...repair (HR, homologous recombination; SSA, single strand annealing) took place and reconstituted the EGFP...site. (c) The pCAG-EGxxFP target plasmid was co-transfected with pX330 plasmids containing sgRNA sequences...efficacy of your gRNAs is then a simple matter of transfecting HEK293T cells with your modified pCAG-EGXXFP...fluorescence, the better that gRNA is at causing a double stranded break at the target site, allowing the two halves...plasmid DNA is much easier and doesn’t require the extra precautions needed when dealing with RNA (e.g. face...(2014): 132-141. PubMed PMID: 24253446. PubMed Central PMCID: PMC3875854. 2. Mashiko, Daisuke, et al. ...

...have since been retracted due to cell line contamination: Epithelial Mesenchymal Transition Is Required for...records allows you to track a cell line’s age and monitor any changes. Your tracking system could be as ...biochemical assays followed by in vivo testing. The mantra being “you can’t trust those whacky cell lines”...colleague. Time and money are wasted, papers are retracted and there is a loss of reputation that can impede... good recordkeeping, you need to have a way of tracking how many passages the cells have undergone and...variety of pharmaceutical companies including GSK, AstraZeneca-MedImmune, and Infors & Applikon. Due to his ...his high level of experience he now travels around Europe giving talks and seminars on cell culture and ...

...has been removed/mutated to neutralize the nuclease activity. For strains that still carry this gene, ...from the DNA. These apurinic sites if in double stranded DNA are repaired by base excision repair, but ...but can lead to mutations in single stranded DNA undergoing replication.   DNase on the other hand can digest...main causes of degradation during plasmid DNA extraction and purification from E. coli is the presence...the gene endA. Nowadays, the most common E. coli strains used for plasmid amplification are endA negative..., there are usually extra steps like heat inactivation, protein degradation, and/or the use of chelating...dilute your sample in water to reduce the EDTA concentration. Alternatively, if the priority is to directly...

...cells, and someone new to plasmids may need some extra guidance to understand the specific components that...survival, such as an antibiotic resistance gene. In contrast, plasmids utilized in the lab are usually artificial...plasmids to self-replicate within a cell make them attractive tools for the life scientist or bioengineer. ...for further study. Promoter Region Drives transcription of the target gene. Vital component for expression...cell types. Primer Binding Site A short single-stranded DNA sequence used as an initiation point for PCR...vector containing the newly inserted gene is transformed into bacterial cells and selectively grown on...Produce proteins that glow so that scientists can track their location or quantity inside a cell Plasmids...

...fun is building within the constraints given. And there were many constraints during the COVID-19 pandemic...looking, I found an inexpensive HDMI transmitter that could transmit a signal between a wall. There was ...impressive, but due to costs and availability, a traditional solution was completely out of reach for Addgene... things first was getting that wireless HDMI transmitter/receiver, to beam the camera’s image to my remote...then set up a monitor connected to the wireless transmitter and an iPad in the office next door (connected...with wireless video receiver, camera control, and extra hand sanitizer.    Cycle 4: Venturing into the...was a bit cumbersome, but it was mobile enough to travel around the office with me, and to move it out of...

...fluorescent protein that was derived from the tetrameric yellow fluorescent protein (LanYFP) from the ...fusion tag for a wide range of applications from traditional imaging to FRET and stochastic single-molecule...fluorescent protein mTPF1 is a monomeric version of the tetrameric cyan fluorescent protein from the coral Clavularia...Alberta and University of Oregon created mTFP1 by transforming E. coli with a gene library of approximately...approximately 484 variants, including some potential tetramer-breaking mutations. The library was then screened through...(2006): 531-540. PubMed PMID: 16859491. PubMed Central PMCID: PMC1698604. Ai, Hui-wang, et al. "Hue-shifted... 6.1 (2008): 13. PubMed PMID: 18325109. PubMed Central PMCID: PMC2292683. Shaner, Nathan C., et al. "A...

...sensor proteins, particularly for the intracellular imaging of transition metal ions, such as zinc, copper,...field is a series of fluorescence resonance energy transfer (FRET)-based calcium biosensors. Perhaps most ...firing in neurons and high resolution functional tracking of T lymphocytes, too, making them a versatile...developed and published in 2010 for visualizing the transcription factor cAMP-responsive element-binding protein...really important and when? That is not known.” Transition Metals Maarten Merkx of Technische Universiteit...the sensors involves plenty of trial and error. Transition metals also present challenges in that they are... are found in cells at much lower concentrations than calcium, requiring greater sensitivity. He and his...

...FPbase Fluorescence Spectra Viewer can be used to compare excitation and emission spectra when available, ...soon feature filter spectra and collection efficiency calculations.  With ~80 FP spectra (and rapidly growing...than is currently represented at fpvis (complete spectral information, accession numbers, sequences and ...thinking about FPs, it would be great to have a centralized, community-editable resource for storage and ...the largest available online collections of FP spectra. Every protein has a page with all the information...biosensors, protein evolution lineages, 2-photon spectra, more elaborate spectrum analysis tools, and a ...

... of the sensor. This “contrast” variant provides improved detection for tracking large populations of ...ppAAV-CKIIa-stGtACR1-FusionRed New tetracycline transactivators Plasmid Serotype Name 99120  AAV1...particular study, which includes comparing the transduction patterns of different AAV serotypes. To help... Biosensor AAV The ability to detect the neurotransmitters and other bioactive molecules is integral ...jGCaMP7c variant in AAV1. This variant exhibits high contrast between its resting state and its calcium-bound...fusion fluorescent proteins can affect DREADD trafficking and localization. The Sternson lab recently deposited...

... antibody specificity. The gold standard in demonstrating primary antibody specificity is to test the ...and knockout samples are the gold standard to demonstrate primary antibody specificity. B, secondary antibody-only... secondary antibody specificity must also be demonstrated. Secondary antibodies have a tendency to interact...equal loading across samples and equal protein transfer from the gel to the membrane. A loading control...dead cells). Compensation controls address the spectral overlap that occurs during multiplexing. Compensation... Crossref, doi:10.1369/jhc.2010.956920. PubMed Central PMCID: PMC3201116. Hewitt, Stephen M., et al. “...Crossref, doi:10.1369/0022155414545224. PubMed Central PMCID: PMC4212362. Alexander, Steve P. H., et al...

... repeat region associates with the trans-activating crRNA (tracrRNA) which interacts with the Cas9 protein...experiments allows you to visualize transfection efficiency and even track localization in cellular experiments... the crRNA or the tracrRNA. Of course, in a single guide system (crRNA and tracrRNA as a single molecule... important cellular RNA molecules with post translational modifications. One of the most common of these...amide linkages, unlocked nucleic acids, and a constrained ethyl.  Can’t decide which RNA backbone modification...

...gradient tube before and after ultracentrifugation so that a scientist can extract virus from the correct layer...layer. The right panel illustrates a gradient tube before and after ultracentrifugation. The viral supernatant...from AAV Purification by Iodixanol Gradient Ultracentrifugation First, you’ll want to identify the reader...for AAV Purification by Iodixanol Gradient Ultracentrifugation. The reader may be, for example, a graduate... differently in a poster compared to an online abstract or Addgene blog post.  Here, we are presenting...profile photo of an iodixanol gradient after ultracentrifugation. The interfaces between layers are muddled...

...factors can negatively impact both translation and fidelity of translation, leading to system-wide effects... incorporation of an unnatural amino acid in translation (Noren et al., 1989). In the late nineties, this...non-interacting with) the cells’ own natural translation machinery; these are often incorporated into ...complicated? Well, while the techniques are straightforward, the systems – the cells growing and producing...final protocol may involve a sensitive balance of trade-offs. This balance can be extremely tricky to find...for the phosphoserine and, because it uses ∆serB strains, does not require exogenously added phosphoserine...checking out all of the plasmids and bacterial strains (available at Addgene for GCE work. Plus, keep ...

...emission (solid) spectra for various teal, green, yellow, orange, and red fluorophores. The spectra for mOrange2...Simultaneous fluorescence (upper trace) and electrophysiological recordings (lower trace) using OCaMP expressed ...3: One- and two-photon excitation and emission spectra of OCaMP. 1P excitation peak is 545 nm, 1P emission...signal-to-noise ratio (SNR). Figure 4: Calcium titration curves for OCaMP and various red and yellow GECIs...expressed in mouse cortex. Bottom: Zoomed-in view of traces corresponding to the dashed box above. The number ...potential (AP) spiking events are indicated below the trace; asterisk indicates a single AP. B) Averaged fluorescence...

...how they started their company here. The first transgenic plant was engineered over 30 years ago, but plant... still in its infancy. A long timeline from transformation to testing and a lack of well-characterized...community needs to reclaim the term “GM” by demonstrating the current benefits and future potential of...decades, and the biochemical pathways involved in central anthocyanin metabolism are well understood. Additional...synthetic biology. Plant molecular biology has traditionally relied on overexpression and knockouts to better...s made even more difficult by the fact that transformation methods have also been patented. In order to.... We will also be working with open source, transformation technologies like those pioneered by Ewen Mullins...

...used with a yeast strain deficient in that compound. Therefore known auxotrophic strain/ selection element...and animals. Unlike bacteria, yeast can post-translationally modify proteins yet they still share many of... genetic system, and a highly versatile DNA transformation system.Unlike most other microorganisms, yeast...plasmids oftentimes utilize an ARS to aid in high transformation efficiency; however, this region does not necessarily...resistant mutants and the insensitivity of yeast strains to some antibiotics. Auxotrophy is defined as the...compound required for its growth. Many auxotrophic strains of yeast exist which can be easily maintained when...antibiotic selection have made utilizing the more traditional drug selection methods feasible in yeast as a...

...group In my travels speaking to grad students and postdocs I have started to talk to trainees more about...better. Track your goal progress as a group. Practice your job talks for one another (trainees never get...read the book “Every Other Thursday: Stories and Strategies from Successful Women Scientists” by Ellen Daniell...experience. They make mentoring less mysterious and train the participants in skills useful for future mentoring... of people who are all interested in making a transition. Schedule your first meeting and get organized... your successes and support each other as you transition to the next stage in your careers! Stay in touch...

...differ between fluorescent proteins in the same spectral class (Cranfill et al, 2016). This non-linear ...important since different fluorescence imaging strategies use widely varying amounts of excitation power...levels (for a prolonged time). Other illumination strategies, such as 2-photon-excitation, selective plane...conditions such as cellular redox state and oxygen concentration may affect photobleaching rates (Shaner et al...the conclusions reached at high power may not translate to real applications in which far less power is...proteins. To avoid diffusion, the proteins are (i) trapped in microdroplets in a water/oil emulsion, (ii) ...) embedded in a gel, or (iii) attached to a substrate. These in vitro methods allow for a well-controlled...