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We narrowed to 1,029 results for: ELL

Showing: 201 - 240 of 1029 results

  1. Plasmid Cloning by Restriction Enzyme Digest (with Protocols)

    Type
    Protocol
    ...use electro-competent cells instead of the more common chemically-competent cells. The number of bacterial...alone control will tell you your “background” level or more specifically it will tell you how many colonies...might need to express YGOI in cultured mammalian cells. The problem is that the only version of full-length...phosphatase treatment of your recipient plasmid as well as a specifically designed test digest later to ...the recipient plasmid DNA without any insert will tell you how much background you have of uncut or self-ligating... manufacturer’s instructions for your competent cells. For most standard cloning, you can transform 1-...1-2μl of your ligation reaction into competent cells such as DH5alpha or TOP10. If using much less total...

  2. Plasmid Cloning by PCR (with Protocols)

    Type
    Protocol
    ...use electro-competent cells instead of the more common chemically-competent cells. The number of bacterial...alone control will tell you your “background” level or more specifically it will tell you how many colonies...the recipient plasmid DNA without any insert will tell you how much background you have of uncut or self-ligating... manufacturer’s instructions for your competent cells. For most standard cloning, you can transform 1-...1-2μl of your ligation reaction into competent cells such as DH5alpha or TOP10. If using much less total...colonies, you might want to use higher competency cells. Additionally, if your final product is going to...

  3. Coomassie Purity Stain of Recombinant Antibodies

    Type
    Protocol
    ...12% NuPage Novex bis-tris mini gel, 1mm thick, 10-well, Invitrogen NP0321BOX 20X MOPS SDS running buffer...Carefully remove the comb from the gel. Rinse each well with 200 µL 1X MOPS running buffer. Fill the chamber...the prestained protein ladder to the appropriate well. Pro-Tip When possible, skip one lane before loading...each recombinant antibody sample to the appropriate well. Pro-Tip Leaving clear lanes between samples will...cast open. Use a razor blade to cut the top of the wells and bottom part of the gel where dye is visible....samples may not have been processed correctly in the cell (e.g., failure to cleave the signal peptide) and...Scatter chart. Change the data range and select the cells where the x-axis is represented. Add a linear trendline...

  4. Protocol - Over-Agar Antibiotic Plating

    Type
    Protocol
    ...investigator to conveniently plate and select transformed cells containing plasmids differing in their resistance... the plasmids of interest (for example, fewer satellite colonies will grow). It is, however, more expensive...bent to create an “L” shape, and then used like a cell spreader. Several other devices may be used for.... During the incubation, transform DH5α E. coli cells by heatshock with the plasmid of interest. See our...the liquid is mostly absorbed. The spreading of cells can be done in the same way as the antibiotic, using... using either a bent micropipette tip or other cell spreading device that fits the plate. Incubate plates...

  5. Affinity Purification of Recombinant Antibodies with Protein A or Protein G

    Type
    Protocol
    ...how to affinity purify recombinant antibodies from cell culture supernatant using Protein A or Protein G...250 mg benzamidine 25 mL of 2 mg/mL aprotinin Mix well and sterilize through a 0.2 µm PES filter. Aliquot...buffer to 1 part tissue culture supernatant and mix well. Uncap the Protein G Gravitrap or rProtein A Gravitrap...after use. Carefully pour the filtered and diluted cell culture supernatant into the Gravitrap column. Collect...

  6. Protocol - How to Inoculate a Bacterial Culture

    Type
    Protocol
    ...bacterial cell. Large plasmids usually have a low copy number (approximately one or two copies per cell) and... can be present in large numbers, 50 or more per cell and have a high copy number. High copy number plasmids...increase this to 350 - 400 rpm to obtain a higher cell density. Reference Page Top Index...

  7. Video Library

    Type
    Protocol
    ... CRISPR Generate genomic deletions in mammalian cells lines using CRISPR/Cas9 Genomic Deletions with CRISPR... virus from a preparation produced in mammalian cells AAV Purification by Iodixanol Gradient Ultracentrifugation... the lab. Blog post: 10 Basic tips for mammalian cell culture Aseptic Technique Aseptic technique is a...fields such as microbiology, molecular biology or cell biology. Learn some of the key strategies of aseptic...

  8. Centrifugation

    Type
    Protocol
    ...dislodge any pellets or re-mix liquids. In cases where you are separating solids from a liquid, pellets represent...pointing up or out of the centrifuge so that the pellets form in approximately the same place in each sample...your experiment, you may be required to save the pellet, the supernatant, or both. Conclusion Centrifuges...

  9. AAV Purification by Iodixanol Gradient Ultracentrifugation

    Type
    Protocol
    ...suitable for virus purification and isolation of cells, organelles, lipoproteins, and macromolecules. Importantly..., iodixanol is inert and non-toxic to mammalian cells. Therefore, and unlike other density gradient media...interface. Make sure that the microcentrifuge tubes are well positioned to collect the solution, or you will ...

  10. Protocol - How to Create a Bacterial Glycerol Stock

    Type
    Protocol
    ...bacteria, preventing damage to the cell membranes and keeping the cells alive. A glycerol stock of bacteria... and you will not need to obtain more competent cells and retransform. Bacteria on an LB agar plate can...

  11. Protocol - How to Ligate Plasmid DNA

    Type
    Protocol
    ...complete plasmid can be transformed into bacterial cells for propagation. The majority of ligation reactions...Interpretation Uncut vector - Checks viability of competent cells and verifies the antibiotic resistance of the plasmid...and vector, and what ratio you want, and it will tell you exactly how much of each to use. Reference Page...

  12. Using a Light Microscope Protocol

    Type
    Protocol
    ...like microbes in a drop of pond water or the cells in your cell culture dish. Microscopes come in a huge ...transmission electron microscopes that allow us to see cellular components with science-fiction levels of detail...

  13. Gibson Assembly Protocol

    Type
    Protocol
    ...England Biolabs (NEB) (Link opens in a new window) sells DNA Assembly kits and master mixes, including NEBuilder...Assembly (Link opens in a new window) . They also sell ET SSB (Link opens in a new window) . NEB has other...

  14. Protocol - How to Design Primers

    Type
    Protocol
    ...another. The size of the primer is very important as well. Short primers are mainly used for amplifying a ...

  18. Water Bath Protocol

    Type
    Protocol
    ...restriction digests needed in molecular biology, and thaw cell lines. There are many different types of water baths...

  20. Pipetting Protocol

    Type
    Protocol
    ...same amount of liquid into different tubes or into wells of a microplate, you may consider using a multichannel...

  22. Pouring LB Agar Plates

    Type
    Protocol
    ... the plasmids of interest (for example, fewer satellite colonies will grow). However, it is also more ...

  23. Antibodies 101: Flow Cytometry

    Type
    Blog Post
    ...plot of CD3 (T cell marker) versus CD19 (B cell marker) to separate the B cell and T cell into distinct...separate the B cell population into progenitor B cells, immature B cells, plasma cells or others.   ...determining cell health, analyzing cell cycle stages, and detecting specific populations of cells in a complex... the cellular level, it cannot be used for subcellular analysis such as morphology or subcellular localization.... As cells pass through the flow cell the size of the sample stream is reduced forcing the cells to line... photons varies from cell to cell depending on the level of fluorescence. A cell expressing high levels...compatible with 96-well plates as collection vessels and can sort single cells into each well allowing users...

  24. Antibodies 101: Beyond Surface Labeling

    Type
    Blog Post
    ...out all CD8+ T cells from a mix of CD8+ T cells, CD4+ T cells, B cells, and dendritic cells. In this case...dumped”. From left to right: B cell, CD4+ T cell, dendritic cell, CD8+ T cell. Created using biorender.com...in flow cytometry are cell proliferation and cell viability. Unlike intracellular labeling, dye staining...be done on live cells. For cellular proliferation, esterified dyes that can enter cells freely are typically...amines on the cell surface, which yields a much weaker signal on live cells compared to dead cells. As a result...comes to labeling cells for flow cytometric analysis, the most common method is a cell surface label, where...through the cell membrane freely, while others require a permeabilized membrane to enter cells. Depending...

  25. Cancer and the Immune System: Deciphering the Relationship

    Type
    Blog Post
    ...activity, and consists of other cell types, especially immune cells and cells of epithelial origin. Suppressing...turns off T cell function upon interaction with APCs. Furthermore, tumor cells alter their cell-surface proteome...molecules needed for T cell effector function. Cancer cells also produce programmed cell death ligand (PD-L1... activity of CTLs and NK cells. These cells would normally kill cancer cells but are directed not to through...to use whole cell therapeutics consisting of various types of immune cells. Dendritic cells (DCs) are particularly... intravenously. B cells and T cells activated ex vivo are also contestants for cell-based immunotherapy... include: Cell heterogeneity Tumors are composed of a wide variety of cell types. This cell heterogeneity...

  26. Antibodies 101: Introduction to Gating in Flow Cytometry

    Type
    Blog Post
    ...Many cell types can be found in the tumor microenvironment (tumor cells, immune cells, blood cells and ...about 53% of my cells are dendritic cells and ~13% are CD8+ T cells. Around 34% of the cells are neither ...neither of the two cell types (likely B cells and others). Almost no cells stain positively for both markers...measure your cells of interest. In many experiments you’ll be working with a heterogeneous cell population...processed piece of tissue, where cells are present that vary in cell type, size, and marker proteins. ...analyzing a homogenous cell population in culture, it is normal to observe diversity in cell size, marker expression...illuminates the passing cell with a laser and detects the light scattered by that cell at a low angle (FSC...

  27. Delivery Methods for Generating iPSCs

    Type
    Blog Post
    ...Pluripotent Stem Cells by Direct Delivery of Reprogramming Proteins." Cell Stem Cell 4, no. 6 (2009): ...Jaenisch. "Induced Pluripotent Stem Cells Meet Genome Editing." Cell Stem Cell 18, no. 5 (2016): 573-86. PubMed...Reprogram Peripheral Blood Cells Check Out Our Interview with Stem Cell Researcher Darrell Kotton Four Factors... express a cocktail of stem cell reprogramming factors and wait for cells to de-differentiate. However...transgene-free and vector-free cells Genome integration Need to sequence cells to verify excision didn’t ...vector-free cells No genomic integration Can be difficult to fully remove virus from cells Plasmid Non-integrating...transduces a wide range of cell types and replicates in the cytoplasm independent of the cell cycle. A challenge...

  28. Antibody Validation for Flow Cytometry

    Type
    Blog Post
    ...label an intracellular target.   Figure 1: HCT 116 WT and SYT1 KO cells were labelled with a green...levels in your cell lines, you can consider a cell treatment approach. If there is a cell treatment (e....antibody shown to perform well in one set of conditions may not perform as well in other conditions. For...select a candidate cell line (e.g. DepMap) – you’ll need to ensure that the parental cell lines of your chosen...the parental cell line, but not in the iso-genic knockout control. This can involve cell surface labeling...selectivity for cell surface labeling may become less selective if used in intracellular labeling because...because the intracellular compartment may contain cross-reacting antigens not present on the cell surface....

  29. Tips for a 1st Time CRISPR User (by a 1st Time CRISPR User)

    Type
    Blog Post
    ...performed on whole-cell extracts from the initial stable cell pool (pool) and from individual cell expansions ... in several human cancers) in A549 cells (a human lung cancer cell line), armed only with viruses obtained...need our A549 cells to express Cas9. In these particular experiments, we generated A549 cells stably expressing...52962-LV, Figure 1). Some cells were then used to generate a monoclonal cell lines by limiting dilution...The rest of the cells were frozen down. Figure 1: Cas9 expression in A549 cells transduced with...blotting was performed on whole-cell extracts from stable pools of A549 cells transduced with Cas9 expressing...A549 cells are relatively easy to transduce. I ended up with too many Cas9 integrations per cell, and ...

  30. 28 Hot Plasmid Technologies from 2015

    Type
    Blog Post
    ...experiments including subcellular visualization of 6 different organelles, a cell cycle indicator for mouse...recorded in the cell's DNA under the right conditions, and could initiate specified cellular processes or...Understanding intracellular pH regulation is important as pH regulation has roles in many cellular functions...signaling pathways to the cell cycle. Good tools for measuring intracellular pH are required in order ...useful tools for light-mediated subcellular localization in mammalian cell culture and reversible control...in live cells is that one can now follow movement of two or more targeted loci during the cell cycle or...mammalian cells, yeast, and Drosophila. Synchronization of secretory protein traffic in mammalian cells The...

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

    Type
    Blog Post
    ...mycoplasma contamination in your cell culture or you are about to begin a new cell culture project. If mycoplasmas...present in most of the cell culture facilities, tissue culture labs and every cell culturist has to deal...cost-effective (Sung, 2006). The sensor cell-based method uses specialized cells that can detect the presence of... should be made available for cell culturing and maintenance of the cell lines. Providing such an environment...Photo by Kate Harten DeMaio. Cell lines and reagents Examine your cell line stock for mycoplasma contamination...cryopreserved vials of the cell lines even though the viability of cryopreserved cells decreases with every ...cause mycoplasma infection from one cell line to another. Multiple cell lines should not be stored in a single...

  32. Antibodies 101: Reading a Flow Plot

    Type
    Blog Post
    ...-B+ cells, and A+B+ cells, but no cells that are A+B-.      Figure 3: It's often easier to identify...population of B cells and dendritic cells (DCs) in the lower middle right. DCs and B cells are HLA-DR+ and...single cells in a population. It can be used to measure protein expression, identify rare cells, or even...looking for cells in a sample that are negative for marker A and positive for marker B, or A-B+ cells. If you...the cell populations as a guide  (Figure 3.) You can see that in our dot plot, we have A-B- cells, A-B...the first step is to separate cells from debris and roughly group the cells by size. This is done using ... and FSC are measured to differentiate cells from debris. Cells are gated, and in the gated population...

  33. Proximity Labeling: A Powerful Tool for Protein Complex Purification and Proteomic Mapping

    Type
    Blog Post
    ...about RapID! EXCELL: Proximity labeling for the detection of cell-cell interactions EXCELL is an enzyme-mediated...contexts.  Proximity labelling relies on the labelling of neighboring proteins within a cell with biotin. Biotin...enzyme-mediated proximity cell labeling strategy to detect cell-cell interactions in vivo (Ge et al., 2019...et al. "Enzyme-Mediated Intercellular Proximity Labeling for Detecting Cell–Cell Interactions." Journal...avidin, proximity labelling can capture weak/transient protein interactions as well as be used for both...a bait protein fused to BirA* in cells and then incubate those cells with exogenous biotin. After a few...BioID and APEX have been developed as well as new proximity labelling techniques. These newer tools are also...

  34. Quick Guide to All Things Lentivirus

    Type
    Blog Post
    ...-dividing cells. The ability to infect non-dividing cells is not restricted to in vitro cell culture as...target cells. If you are transducing non-adherent cells you might need to centrifuge your cells with the...favourite gene into your favourite cell line or into primary cells, this blog article will give you some...infect both dividing and non-dividing cells, including stem cells. These properties make lentiviral vectors...immortalized cells lines but reach their limits when it comes to transferring DNA into primary cells or non-...non-dividing cells. To target these un-transfectable cells, labs use viral vectors and particularly retroviral...will first need to transfect producing cells, usually 293T cells, with your transfer plasmid and your packaging...

  35. Plasmids 101: Protein Expression

    Type
    Blog Post
    ...produced using complex mixtures derived from cells or using live cells. There are several types of expression...consists of transfecting cells with your DNA template of choice and allowing these cells to transcribe, translate...demanding cell culture conditions compared to other systems. Insect expression systems Insect cells can also...coli or yeast cells. The only problem with baculovirus systems is that the infected host cell is eventually...eventually lysed. Cell lysis halts protein production, but there are non-lytic insect cell expression systems...Sf21, Hi-5 cells)  that allow for continuous expression of genes integrated into the insect cell genome. ...that is then transformed into a bacterial cell. Transformed cells propagate, are induced to produce your ...

  36. 27 Hot Plasmids from 2016

    Type
    Blog Post
    ... HEK293FT cells expressing a single gRNA targeting a single gene. The gRNA expressing cells were then ...plasmid to generate a population of mutant cells. The mutant cells were treated with WNV at a dose and duration...regulate the ability of WNV to induce cell death in infected cells (SEL1L, UBE2J1, EMC3, EMC2, DERL2, UBE2G2...screens in human cells. General information regarding how to use a CRISPR pooled library as well as criteria...small GTPases involved in cell signaling pathways that control many cellular processes such as differentiation...community as well. The pooled library, designed to be used with cultured Drosophila cells, targets 13,...and analysing autophagy of cytosol and organelles in yeast cells. Named after the brightly-coloured Australian...

  37. Plasmids 101: Mammalian Vectors

    Type
    Blog Post
    ...transfected cells may be considered an entirely new cell line from that of the original parental cells. Positive...cultured mammalian cells. Of course, these mammalian vectors must be compatible with the cell type they are...bacterial cells); however, the techniques and reagents vary. Plasmid transfection into mammalian cells is fairly...expression levels in the cells. Ideally, the chosen reporter is unique to the cell, is expressed from the...components expressed in trans within the cell for effective replication. Cell lines expressing the Epstein–Barr...mammalian cells To achieve stable transfection, there should be a selective pressure to force cells to incorporate...(basically growing cells in various concentrations of the selection reagent). Cells should die within ...

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

    Type
    Blog Post
    ...and spread of cancer cells. Besides these stromal cell modifications, stromal cells are also constantly...how cancer cells influence microenvironments and vice versa, let’s take a look at cancer cell metabolism...inflammation, a noteworthy cell type in the tumor microenvironment is the immune cells. The contradiction is...injecting breast cancer cells into mice, exosomes expressed specific integrins (cell-adhesion proteins) targeting... be transferred to other cells, inducing epigenetic changes in targeted cells. In this case, exosomes ...Friendly” microenvironment cells Not all is bad news – we also have “friendly” cells in microenvironments! ...Take myoepithelial cells for instance. They retard tumor formation by inhibiting cell growth, invasion,...

  39. Antibodies 101: Introduction to Antibodies

    Type
    Blog Post
    ...on or in these cells: antibodies can bind to proteins on the cell surface, or the cell membrane can be...same cell simultaneously as well as compare between samples. Learn more about flow cytometry. Cell and ...antibodies are produced by B cells. They bind to proteins on the surface of extracellular pathogens such as parasites...fusing B cells that have been extracted from animals injected with protein antigen to myeloma cells. The ... measurement of protein expression in cell lysates, whole cells, or tissue samples. Many experiments that...shows that a similar concentration of cell lysate was added to each well. Image from Sun et al., 2010. ...heterogeneous mixture - for example, cell lysate or media from cultured cells. ELISA can be used to quantitatively...

  40. Getting the Most from Your Lentiviral Transduction

    Type
    Blog Post
    ...quiescent cells do not take up nucleic acid or express transgenes as well as actively dividing cells resulting...therefore titers obtained in one cell type may not translate well to other cell types. To overcome this issue...Love your cells and they'll love you back A successful lentiviral infection begins with your cells, both ...both your packaging cells and your target cells. Poor tissue culture practices can lead to low titers and... promote cell growth. Overgrown cultures stimulate quiescence, the resting phase of the cell cycle; quiescent...reaching 108 cells per ml before the media becomes cloudy. Mycoplasma compete with host cells for nutrients... your producer cells with fresh medium. Daily medium exchanges help alleviate cellular stresses associated...
Showing: 201 - 240 of 1029 results