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  1. Fluorescence Titering Assay

    Type
    Protocol
    ... Protocols Fluorescence Titering Assay Fluorescence Titering Assay ...resulting in 25% fluorescent cells, then the titer is: (150,000 cells x 0.25 fluorescent x 100)/(1.5 mL)...resulted in 25% fluorescent cells, then the titer is: (150,000 cells x 0.25 fluorescent)/(0.015 mL) = ...preparations carrying a fluorescence marker. Protocols...to titer lentiviral preparations that carry a fluorescence marker. Determining the titer of your lentiviral...uses microscopy to determine the percentage of fluorescent cells, these cells can still be used in downstream...media, replace with fresh media Day 4–5: Count fluorescent cells Equipment Class II, Type A2 Biological ...

  2. Fluorescent Proteins 101: Fluorescent Biosensors

    Type
    Blog Post
    ... of fluorescently-labeled components Fluorescence-activated cell sorting (for cells); fluorescent HPLC...electrochemical or light-based, with luminescent and fluorescent reporters being especially popular. We...the same pattern described above - a sensing domain induces changes in a fluorescent signal based on ligand... We’ll give you an introduction to fluorescent biosensors, but keep in mind that there is a lot of variety...calcium and zinc. Some biosensors contain a single fluorescent protein fused to a domain that senses the concentration...When calcium is absent, the construct does not fluoresce; when present, calcium induces CaM/RS20 interaction...s structural organization and activating the fluorescent signal. Blue flame GECO biosensors from Robert...

  3. Fluorescent Proteins 101: History of Fluorescent Proteins

    Type
    Blog Post
    ...off light include chemiluminescent proteins, like luciferases, as well as fluorescent ones, like Green ...Green Fluorescent Protein (GFP). These molecules occur naturally in bioluminescent organisms, but their real...previously reach. Nobel Prize for fluorescent proteins The importance of fluorescent proteins was recognized in...learning more about fluorescent proteins, I invite you to download our Fluorescent Protein eBook and learn...Luminescent molecules are very useful tools because we can easily detect and measure the light they emit...laboratory. The discovery of GFP The story of how fluorescent proteins like GFP came to be used as research...interesting. Although humans have known about bioluminescent organisms and their characteristic radiance...

  4. Fluorescent Proteins 101: Fluorescent Protein Timers

    Type
    Blog Post
    ...time.Hallmarks of fluorescent protein timers When FP timers are first expressed, they predominantly fluoresce one ...independently) originally fluoresce green or blue and, when they mature, fluoresce red. The ratio of the ...Advice on Choosing Your Fluorescent Protein Resources at Addgene.org Find Fluorescent Protein Timers Browse...Browse All Fluorescent Protein Empty Backbones Check Out Our Fluorescent Protein Guide ...Even before fluorescent proteins (FPs) came into wide use, there were a variety of ways to monitor cell...situ hybridization experiments. In many cases fluorescent proteins have usurped old methods or complemented...color but slowly mature until they predominantly fluoresce a second color. This change is usually hypothesized...

  5. Fluorescent Proteins 101: Photoactivatable Fluorescent Proteins

    Type
    Blog Post
    ...from low fluorescent states to high fluorescence states, they can change from one fluorescent color to...proteins. Photoactivatable fluorescent proteins (PA-FPs) are fluorescent proteins that display unique...their fluorescence can be switched on and off reversibly. This ability to modulate fluorescence allows...switched on from a state of dim or no fluorescence, to a brighter fluorescent state by exposure to a specific...photoconvertible fluorescent proteins (PC-FPs). PC-FPs can convert from one fluorescent color to another... a bright fluorescent state (“kindling”), and from a bright state to a dark non-fluorescent state (“quenching...reversible, monomeric red fluorescent PA-FPs. rsCherries have a high background fluorescence, but their single...

  6. Fluorescent Proteins 101: Green Fluorescent Protein (GFP)

    Type
    Blog Post
    ...Bioluminescence and fluorescence from proteins such as Green Fluorescent Protein (GFP) has likely existed...1995, Roger Y. Tsien described an S65T point mutation that increased the fluorescence intensity and photostability...folding, maturation, and fluorescence. Biosensors: A wide array of GFP-based fluorescent biosensors has been...techniques in fluorescent microscopy. Read More: All Plasmids 101 Articles Addgene's Fluorescent Protein ... its biochemical properties. Now GFP and its fluorescent derivatives are a staple in the lab. GFP is used... common applications in the lab. Why Green Fluorescent Protein? GFP is a ~27 kDa protein consisting ...crystal jellyfish Aequorea victoria. It has a fluorescent emission wavelength in the green portion of the...

  7. Fluorescent Protein Travel Awards - FLiPs and Fluorescent Protein Biosensors

    Type
    Blog Post
    ...opportunities. Xin Zhou: Fluorescent Light-inducible Proteins (FLiPs) Fluorescent proteins can be applied...Brightest Fluorescent Protein for Your Experiments Resources on Addgene.org Find Fluorescent Protein ...Fluorescent proteins have enabled scientists to pursue creative research avenues previously unavailable...applications, researchers are finding new ways to apply fluorescent proteins everyday.  The late Michael Davidson... and develop these tools by making their own fluorescent protein technologies widely available to the ... are intended to help scientists share their fluorescent protein research with the academic community ...stood out for their creativity in the use of fluorescent proteins and the potential for their work to ...

  8. Fluorescent Proteins 101: Monitoring Cell Mobility Using Fluorescent Proteins

    Type
    Blog Post
    ...track fluorescently labeled cells? 1. Epifluorescence microscopy This technique uses a fluorescence microscope...for many fluorescent proteins. Additional fluorescent protein tools Photoactivable fluorescent proteins...the visualization of fluorescent proteins expressed in the specimen.  2. Fluorescence Activated Cell Sorter... By using cells labelled by fluorescent chemicals or by other fluorescent proteins, labs were also able... that exist in vivo. The use of fluorescent pathogens and fluorescent cells enables scientists to monitor...Laser include: Blue-green fluorescent proteins like EGFP Yellow-orange fluorescent proteins like TagRFP, ...irreversible photoconversion from green fluorescence to red fluorescence) are also useful tools to use with...

  9. Starter guide to induced pluripotent stem cells (iPSCs) part 1:  A renaissance in regenerative medicine

    Type
    Blog Post
    ...generating iPSCs iPSCs and ESCs closely resemble each other in many aspects. Like ESCs, iPSCs have a high self-renewal...express stem cell markers similar to ESCs [11].  While iPSCs and ESCs have similar functional utility, iPSCs... as descendants of totipotent cells. An example of pluripotent cells is embryonic stem cells (ESCs), which...according to their source: Embryonic stem cells ESCs are pluripotent stem cells that are able to form...fertilization treatments and donated afterwards for ESC research purposes, with the informed consent of the... a table listing some of them: Characteristic ESC ASC Self-renewal High Low once isolated from the...Ethical concern High. Embryos are destroyed during ESC isolation. Low Chances of post-transplantation ...

  10. SunTag and Fluorescent Imaging

    Type
    Blog Post
    ...turn up the brightness in your fluorescent imaging experiments. Fluorescent protein fusions One of the easiest...Blog Sign Up to Receive the Fluorescent Protein eBook Avoid Fluorescent Protein Oligomerization Learn...Resources on Addgene.org Find Fluorescent Protein Empy Backbones Visit Our Fluorescent Protein Guide Page Find...biological lesson and created a system to amplify fluorescent signals. Named for the "stellar explosion SUperNova... to track a given protein is to fuse it to a fluorescent protein. You can then study where the protein...these problems? Instead of directly fusing a fluorescent protein to your protein of interest, you instead.... This system amplifies the intensity of the fluorescent signal and enables single molecule tracking  ...

  11. Luminescent Imaging with Nano-lanterns

    Type
    Blog Post
    ... Since fluorescent proteins (FP) require external light activation, you can’t use fluorescence to monitor...practical due to the low intensity of luminescent proteins. To make luminescent imaging a reality, Addgene depositor...with Venus. This luminescent technology is based on the principle of bioluminescence resonance energy ...detection is difficult using fluorescent imaging due to autofluorescence and a high signal-to-noise ratio... a few drawbacks associated with luminescent imaging: A luminescent substrate is required for imaging... Learn about Photoactivatable Fluorescent Proteins Check Out Fluorescent Protein Timers Use Rosella to...All Our Fluorescent Protein Resources Find FRET Plasmids Find Empty Backbones with Fluorescent Protein...

  12. The Fluorescent Vegetables in Aptamer Soup

    Type
    Blog Post
    ...small molecule activates the fluorescence of the small molecule. Fluorescent RNA aptamers are used to track... applications of fluorescent RNA aptamers in Addgene’s collection. Green fluorescent aptamers Spinach ...Polymerase III. Red and orange fluorescent aptamers Corn was described in the same study as Red Broccoli...selection of an RNA mimic of green fluorescent protein by fluorescence-based selection and directed evolution...using aptamers might know this best, as most fluorescent aptamers are named for a fruit or vegetable! ...What is an RNA aptamer? RNA is not inherently fluorescent and can be challenging to track intracellularly... affinity to small molecules to induce their fluorescence. Until a binding event occurs, neither the aptamer...

  13. Antibodies 101: Introduction to Immunofluorescence

    Type
    Blog Post
    ... using fluorescence (for some background on fluorescence, try the Introduction to Fluorescence Microscopy...proteins. You can then use fluorescent microscopy to look for those fluorescent molecules, knowing that ...Comparison between how direct immunofluorescence and indirect immunofluorescence work. Image created with ...Introduction to Fluorescence Microscopy. iBiology. https://www.ibiology.org/talks/fluorescence-microscopy/...Antibodies Learn more about fluorescence microscopy in Which Fluorescence Microscopy Techniques is Best...Immunofluorescence (IF), is an immunoassay that brings to light the cellular world. The technique allows...and performing an IF experiment. What is immunofluorescence? Generally speaking, IF is an application...

  14. Antibodies 101: Multiplex Immunofluorescence

    Type
    Blog Post
    ...reagents like fluorescently-labeled nanobodies or scFvs. Many, many options for fluorescently conjugated ...Antibodies Which Fluorescence Microscopy Technique is Best for Me? Introduction to Immunofluorescence Resources...You may be familiar with immunofluorescence (IF, often referred to as immunocytochemistry (ICC) when ...binds a target protein in your sample, then a fluorescently labeled secondary antibody binds that first ...The general process is similar to standard immunofluorescence, but with some extra considerations (Im et...  Figure 1: Schematic of multiplex immunofluorescence approaches. A) Sequential Multiplex IF, where...labeled and imaged at a time, inactivating the fluorescent secondary antibodies before labeling the next...

  15. Fluorescent Proteins 101: Luciferases

    Type
    Blog Post
    ...Table 1: Properties of luminescence versus fluorescence   Luminescence Fluorescence Source of light ... reaction is not fluorescence! Chemiluminescence, which includes all bioluminescence, is the production... source (usually a laser in fluorescence assays), which means luminescence assays have lower background...knockdown. BRET for the best of both (fluorescent and luminescent) worlds Forster Resonance Energy Transfer...needed — just the luminescent substrate. This approach preserves the advantages of luminescent assays (low ...brings the fluorescent protein close enough, energy is transferred by BRET and the fluorescent protein emits...For most people, the most familiar source of bioluminescence is the firefly. Along with charming nighttime...

  16. Light Sheet Fluorescence Microscopy

    Type
    Blog Post
    ...Developments in light sheet fluorescence microscopy Modern light sheet fluorescence microscopy was first pioneered... advances in microscopy has been light sheet fluorescence microscopy (LSFM). The underlying method was...colleagues and originally named orthogonal-plane fluorescence optical sectioning (OPFOS) (2). Arne Voie, David...laser beam into a thin sheet to illuminate a fluorescent sample and captured the reflected light using...After this initial application, Stelzer’s group described the single-plane or selective-plane illumination...configurations’ various features see (4,7).   Light sheet fluorescence microscopy vs. confocal microscopy In confocal... such as whole mouse brains expressing green fluorescent protein (GFP) (6).   The Dodt and Frank Bradke...

  17. Fluorescent Tagging of Endogenous Genes with SapTrap

    Type
    Blog Post
    ...containing several types of fluorescent (EGFP, tagRFP, mCherry) and nonfluorescent (Halo, SNAP) tags, a selectable...Blog Learn about Fluorescent Protein Timers Check out Photoactivatable Fluorescent Proteins Use Rosella...SapTrap Kit Page Find Other Fluorescent Protein Kits Browse the Fluorescent Protein Collection ...GFP over 50 years ago, the growing spectrum of fluorescent proteins (FPs) has been an invaluable resource...limitations to working with FPs. Overexpression of fluorescently tagged proteins can lead to improper protein...One way to avoid the pitfalls of overexpressed fluorescent protein fusions is to replace the genomic copy...copy of your gene of interest with a fluorescent protein fusion. CRISPR genome editing can help accomplish...

  18. Which Fluorescence Microscopy Technique is Best for Me?

    Type
    Blog Post
    ...super-resolution (3). Fluorescence microscopy techniques   Fluorescent Widefield Microscopy Fluorescent Widefield...block out of focus fluorescence from reaching a detector or restricting fluorescence to specific excitation...Choosing Your Fluorescent Proteins for Multi-Color Imaging Choose the Brightest Fluorescent Protein for ... Addgene.org Browse Our Fluorescent Protein Resources Find Empty Fluorescent Protein Backbones Find Plasmids... into noise. Due to its unrivaled contrast, fluorescence imaging has emerged as the dominant light microscopy...modern biology (1). When performed correctly, fluorescence microscopy provides a high contrast image in...Microscopy is the most common and simplest form of fluorescent microscopy. Collimated (non-converging or diverging...

  19. Fluorescent Proteins 101: Introduction to FRET

    Type
    Blog Post
    ...emission by fluorescence. The widespread use of FRET with fluorescent molecules, including fluorescent proteins..., et al. "Fluorescent protein based FRET pairs with improved dynamic range for fluorescence lifetime measurements...Miyawaki, Atsushi, et al. "Fluorescent indicators for Ca2+ based on green fluorescent proteins and calmodulin... Out Fluorescent Protein Biosensors Browse the Entire Fluorescent Protein Collection ...Resonance Energy Transfer (FRET) was originally described by Theodor Förster in 1948 as a variation of the...proteins, has led to the alternative acronym Fluorescence Resonance Energy Transfer. Unlike the typical excitation...seem overwhelming given the large assortment of fluorescent proteins available. Fortunately, several excellent...

  20. Rosella: A Fluorescent pH-Biosensor for Studying Autophagy

    Type
    Blog Post
    ...pH-sensitive fluorescent biosensor that was recently deposited with Addgene by Dr. Mark Prescott. This system... is the permanent fluorescent tag portion of Rosella: it will emit red fluorescence regardless of its ...the fluorescent properties of Rosella.   Table 2: Effect of Localization on Rosella’s fluorescence emission...green fluorescence accumulates in the vacuole. See Figure 2 for an example of what fluorescence looks ... Hatzinisiriou, I., Prescott, M., & Devenish, R. J. (2008). Rosella: A fluorescent pH-biosensor for reporting...Photoconversion Light Sheet Fluorescence Microscopy Additional Resources on Addgene.org Fluorescent Protein Plasmids...Plasmids and Resources Fluorescent Protein Guide: Biosensors Keima, another fluorescent pH-biosensor for studying...
Showing: 1 - 20 of 711 results