scinote-web/app/assets/templates/experiment_497/experiment.json
2020-08-31 16:29:23 +02:00

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{
"experiment": {
"id": 497,
"name": "SDS-PAGE for Protein Characterization",
"description": "This experiment template will help you separate proteins based on their molecular weight. \r\nProteins are separated by electrophoresis through a gel matrix. Smaller proteins migrate faster due to less resistance from the gel matrix. Other influences on the rate of migration through the gel matrix include the structure and charge of the proteins. In SDS-PAGE, the use of sodium dodecyl sulfate (SDS, also known as sodium lauryl sulfate) and polyacrylamide gel largely eliminates the influence of the structure and charge, and proteins are separated solely based on polypeptide chain length.\r\nStaining with Coomassie blue dyes is commonly used to stain proteins and visualize them. But if you want to identify specific proteins (using specific antibodies) a better technique to use is a Western blot.",
"project_id": 223,
"created_by_id": 202,
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"created_at": "2018-12-24T10:56:55.416Z",
"updated_at": "2019-01-28T15:15:24.331Z",
"uuid": "3363b358-1478-402c-8597-57739d3fb2e3"
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"id": 2388,
"name": "Western Blot",
"due_date": null,
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"x": 99,
"y": 0,
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"step": {
"id": 5264,
"name": "Probing with antibodies and detection of the bands",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<p><strong>Blocking buffer: </strong></p>\n<ul>\n<li>\n<strong>1-3% BSA in PBS-T: </strong>Bovine serum albumin (BSA) is used as a blocking agent.</li>\n<li>\n<strong>1-5% skim milk in PBS-T </strong>Skim milk is more effective in blocking and used frequently. However, it can interfere with specific antigen-antibody reactions. <em><strong>Skim milk contains the </strong><strong>phosphoprotein </strong><strong>casein and therefore is not suitable for the detection of phosphoproteins.</strong></em>\n</li>\n</ul>\n</body></html>",
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"created_at": "2018-12-24T13:33:23.306Z",
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"name": "Guidelines",
"step_id": 5264,
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"checklist_items": [
{
"id": 4013,
"text": "Place the membrane in blocking buffer and incubate at room temperature for 1 hour (or at 4°C overnight) with shaking.",
"checked": false,
"checklist_id": 974,
"created_at": "2018-12-24T13:33:23.310Z",
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"position": 0
},
{
"id": 4014,
"text": "Wash the membrane with washing buffer 3 times (5 minutes each time).",
"checked": false,
"checklist_id": 974,
"created_at": "2018-12-24T13:33:23.316Z",
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},
{
"id": 4015,
"text": "Place the membrane in primary antibody solution diluted in 1% BSA in Tween PBS, pH 7.2, and incubate at room temperature for 1 hour with shaking.",
"checked": false,
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"created_at": "2018-12-24T13:33:23.321Z",
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},
{
"id": 4016,
"text": "Wash the membrane with washing buffer 3 times (10 minutes each time).",
"checked": false,
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"created_at": "2018-12-24T13:33:23.327Z",
"updated_at": "2018-12-24T13:33:23.327Z",
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"position": 3
},
{
"id": 4017,
"text": "Place the membrane in secondary antibody diluted in 1% BSA in Tween PBS, pH 7.2, and incubate at room temperature for 1 hour with shaking.",
"checked": false,
"checklist_id": 974,
"created_at": "2018-12-24T13:33:23.332Z",
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"position": 4
},
{
"id": 4018,
"text": "Wash the membrane with washing buffer 3 times (10 minutes each time).",
"checked": false,
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"created_at": "2018-12-24T13:33:23.337Z",
"updated_at": "2018-12-24T13:33:23.337Z",
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"step": {
"id": 5262,
"name": "Transfer of proteins to a membrane",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<p>Soak a piece of <strong>PVDF membrane</strong> slightly larger than the gel in methanol for <strong>1 minute</strong> (pre-wetting), and then equilibrate in transfer buffer. Also, equilibrate two pieces of filter paper slightly larger than the PVDF membrane in transfer buffer. There is no need for pre-wetting a nitrocellulose membrane. Skip using methanol, and equilibrate the membrane in transfer buffer.<br><br><strong>Transfer buffer:</strong></p>\n<ul>\n<li>25 mM Tris-HCl</li>\n<li>192 mM glycine</li>\n<li>20% MeOH</li>\n</ul>\n<br>Equilibrate the gel in transfer buffer after electrophoresis. <br><br>Place a piece of equilibrated filter paper on the anode plate, and place the membrane, gel, and another piece of filter paper without any air bubbles. All of these should be sandwiched between two sponges.</body></html>",
"position": 0,
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"created_at": "2018-12-24T13:17:10.122Z",
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"step": {
"id": 5263,
"name": "Blotting",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<p>Connect <strong>the plus electrode to the anode plate</strong> and connect the <strong>negative electrode to the cathode plate</strong>.<br>Turn on the power supply and transfer for <strong>1 hour</strong> at <strong>50 mA</strong> (for one gel).<br><br>Turn off the power supply, remove the membrane, and temporarily stain to check the efficiency of transfer and to visualize the molecular weight markers to confirm their positions.<br><strong>Ponceau S</strong> is commonly used for this purpose because the membrane is easily destained, and it does not interfere with subsequent probing with antibodies.<br><br><strong>Ponceau S solution: </strong></p>\n<ul>\n<li>1g Ponceau S</li>\n<li>50mL acetic acid</li>\n<li>Make up to 1L with ddH2O</li>\n</ul>\n</body></html>",
"position": 1,
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"created_at": "2018-12-24T13:24:09.108Z",
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"step": {
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"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body><p>Prepare the chemiluminescence detection reagent according to the instruction manual. Place the membrane on a piece of plastic wrap, and add the reagent to the membrane. Allow it to stand for <strong>1 minute</strong>, and remove the reagent using a pipette. <br>Wrap the membrane in a piece of plastic wrap, remove any air bubbles, and place it under a chemiluminescence detection apparatus (e.g., CCD camera) for viewing.</p></body></html>",
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"created_at": "2018-12-24T13:34:41.460Z",
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"name": "Standard Coomassie Stain",
"due_date": null,
"description": null,
"x": 99,
"y": 14,
"my_module_group_id": 1195,
"created_at": "2018-12-24T12:42:30.757Z",
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"step": {
"id": 5260,
"name": "Destain",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<strong>Destain solution</strong>: Add <strong>500mL</strong> of HPLC- grade methanol to <strong>300 mL</strong> of HPLC grade water. Add <strong>100 mL</strong> of reagent grade acetic acid and, after mixing, adjust the total volume to <strong>1000mL</strong> with water. The final concentrations are <strong>50%</strong> (v/v) methanol in water with <strong>10%</strong> (v/v) acetic acid. <br><br>Cover the gel with<strong> ~250mL</strong> of the destain solution and allow the gel to destain with gentle agitation. The destain solution should be changed several times, removing it at each change by aspiration. Continue the destaining until the protein bands are seen without background staining of the gel.</body></html>",
"position": 3,
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"created_at": "2018-12-24T12:50:15.910Z",
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"step": {
"id": 5258,
"name": "Washing of the gel",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body><p>Cover the gel with <strong>500mL</strong> of the gel-washing solution.  <br><br><strong>Gel-washing solution:</strong> Add <strong>500mL</strong> of HPLC-grade methanol to <strong>300 mL</strong> of HPLC grade water. Add <strong>100mL</strong> of reagent grade acetic acid and adjust the total volume to <strong>1000 mL</strong> with HPLC grade water. The final concentrations are <strong>50%</strong> (v/v) methanol in water with <strong>10%</strong> (v/v) acetic acid. <br><br>Continue to fix the proteins in the gel by incubating overnight at room temperature with gentle agitation. The gel should be covered during this process to avoid contamination and to prevent the evaporation of the solution. At the end of this time, remove the solution by aspiration.</p></body></html>",
"position": 1,
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"created_at": "2018-12-24T12:47:54.498Z",
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"step": {
"id": 5259,
"name": "Comassie staining",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body><p><strong>Comassie Stain:</strong> Dissolve <strong>0.4g</strong> of Coomassie blue R350 in <strong>200 mL</strong> of <strong>40%</strong> (v/v) HPLC grade methanol in water with stirring as needed. Filter the solution to remove any insoluble material. Add <strong>200mL</strong> of <strong>20%</strong> (v/v) acetic acid in water. The final concentration is <strong>0.1%</strong> (w/v) Coomassie blue R350, <strong>20%</strong> (v/v) methanol, and <strong>10%</strong> (v/v) acetic acid.<br><br>Cover the gel with <strong>400mL</strong> of the Coomassie stain. Stain the gel at room temperature for <strong>3 to 4 hours</strong> with gentle agitation. The Coomassie stain is removed by aspiration after staining.</p></body></html>",
"position": 2,
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"created_at": "2018-12-24T12:49:39.311Z",
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"step": {
"id": 5257,
"name": "Gel fixation",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<strong>Gel-fixing solution:</strong> Add <strong>500mL</strong> of USP-grade <strong>95% (v/v)</strong> ethanol to <strong>300 mL</strong> of HPLC grade water. Add <strong>100 mL</strong> of reagent grade acetic acid and adjust the total volume to <strong>1000 mL</strong> with water. The final concentrations are <strong>50%</strong> (v/v) ethanol in water with <strong>10%</strong> (v/v) acetic acid.<br><br>After electrophoresis, the gel is washed off the glass plates with<strong> 500 mL</strong> of the gel-fixing solution and soaked in that solution for <strong>1 hour.</strong><br><br>The purpose of this step is to gently remove the gel from the plate and begin washing the SDS-containing gel buffers out of the gel. At the end of this time, remove the solution by aspiration.</body></html>",
"position": 0,
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"created_at": "2018-12-24T12:45:54.303Z",
"updated_at": "2019-02-19T14:04:53.947Z",
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"step": {
"id": 5261,
"name": "Storage of gels",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body>\n<strong>Storage solution:</strong> Add <strong>25mL</strong> of reagent grade acetic acid to <strong>400mL</strong> of HPLC grade water. After mixing, adjust the final volume to <strong>500mL</strong> with water. The final concentration of acetic acid is <strong>5%</strong> (v/v).<br><br>Equilibrate the gel in the <strong>500mL</strong> of the storage solution for at least <strong>1 hour</strong>. The gel should return to its original dimensions during this process. Store the gel in the storage solution as needed. It might be convenient to carefully transfer the gel to a heat-sealable bag for longer-term storage.</body></html>",
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"created_at": "2018-12-24T12:52:54.562Z",
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"name": "Electrophoresis",
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"step": {
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"name": "Sample loading",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body><p>Remove air bubbles and small pieces of gel from the wells and under the gel using a syringe.<br>Load prepared samples into wells and make sure not to overflow. Don't forget loading <strong>protein marker into the first lane</strong>. Then cover the top and connect the anodes.</p></body></html>",
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"name": "Remove the gel",
"description": "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">\n<html><body><p>Remove the gel assembly from the electrophoresis apparatus. Remove the gel from the glass plates using a spatula, and prepare for subsequent analysis.</p></body></html>",
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