Expérimentation animale, entre droit et liberté (Sciences en questions) (French Edition)

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If you need this information, please send inquiry to our tech team. We do not recommend the room temperature since it is not stable. TMB can act as a hydrogen donor for the reduction of hydrogen peroxide to water by peroxidase enzymes such as horseradish peroxidase. The reaction will be terminated and the color developed in the wells will turn from blue to yellow upon addition of the stop solution. The absorbance value should be read at nm. We recommend you use dual-spectrum to test your sample to avoid the error caused by interference and scratch in the bottom.

Please ensure the same volume of wash buffer per well and you'd better use multi-channel pipette. No rinse but gently wash. Hold the plate vertically and wash it thoroughly to reduce the edge effect. ELISA is the abbreviation of the enzyme-linked immunosorbent assay used to identify the presence of specific proteins and to determine their concentrations. Please refer to our manual for details. You should check the components and Lot No. You should be sure all wells are filled with buffer with the same volume during every wash step.

After final wash, blot plate forcefully on paper towel to remove residual buffer. Contamination of the pipette tips and chromogenic agent container with the enzyme conjugate or contamination of blank wells with positive control. You should change pipette tips between reagents and use separate reservoirs for each reagent.

Use pipette during operation.

Aller plus loin

Substrate exposed to light or contaminated prior to use. You should keep substrate in the dark until ready to dispense into wells. Concentration of detection antibody or avidin-HRP is too high. You should check calculations or try again after further dilution. Incubation time or color developing time is too long. You should follow the kit protocol strictly.

Wrong wavelength used when taking readings. Wavelength should be nm with a nm wavelength correction for TMB. Reagents were wrongly used. You should check the label carefully when preparing or using. Chromogenic agent inactive with the contamination of enzyme conjugate during wash or sample addition steps. You should ensure no enzyme inhibitor in the enzyme conjugate container. Check and ensure the washing buffer container clean. A reagent or a step of the procedure taken by mistake.

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You should read the kit protocol carefully and follow each step strictly. Reagents expired or improperly stored. You should keep the kit well stored according to the kit protocol and use it before expiration date. Reagents and samples were not brought to room temperature prior to use. You should put all the reagents and samples under room temperature for 30 minutes. Pipette suction of fluids insufficient, pipette emissions too fast, fluids on the tip wall too much or tip wall unclean. You should use calibrated pipettes to ensure the pipette tips firmly matched and pipette slowly.

Single use is recommended. Insufficient color development time. You should develop color in minutes.

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Color development reagent added in incorrect order. Too much washing or improper dilution of concentrated wash buffer. You should reduce washing impact force: You should check and ensure the pH is neutral when preparation of wash buffer is finished.

Ensure the purified water no contamination. NaN3 preservatives from the samples inhibit the reaction of enzyme. You should avoid use this perservative in samples. No strong positive samples on the detected ones, the result is normal. You should repeat the assay if you have any doubt.

Wrong filter is used when taking readings. Improper storage of the kit or poor storage environment.

What data is collected and for what purposes?

You should store all components as recommended on data sheet rather than room temperature for excess time. Incorrect preparation of standard. You should reconstitute standard strictly with the recommended diluent according to the kit protocol. You should prepare reagents in 10 minutes prior to use and add them to wells promptly. Insufficient mixing after adding samples. You should fully mix reagents in the vortex mixer when adding several reagents at the same time.

Be careful when holding reagents to avoid splashing. Inconsistent incubation time, washing condition, color development condition and operators. You should repeat the assay of standard. Ensure consistent reactivity condition and operators. Check that all ports of the plate washer are unobstructed to ensure sufficient washing. You should keep constant temperature during incubation to avoid temperature fluctuations.

Too much residual on the wall of the wells when adding or the bottom of wells scratched with pipette tip. You should lower the pipette tips along the wall of wells when adding slowly and carefully. Do not touch the bottom of wells. You should change pipette tips between samples and reservoirs between reagents.


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Occasional positive and negative values close to the cut off value. You should set 3 duplicates for the same sample and the same result over 2 samples. Cross contamination when adding samples. You should avoid cross contamination when adding samples. Cross contamination during manual washing. You should reduce the cross contamination by promptly removing the liquid in wells after 3 times of filling washing buffer during manual washing and then setting the soak time the next times.

Cross contamination when patting the plate.

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You should use proper paper towels when patting the plate. Do not bring unrelated materials into the plate. Do not pat at the same place to avoid cross contamination. Contamination due to long storage of samples. Present to your audience Start remote presentation. Do you really want to delete this prezi? Neither you, nor the coeditors you shared it with will be able to recover it again. Comments 0 Please log in to add your comment. Histoire d'une demande sociale. Revue des Sciences Humaines et Sociales. Le Mangeur et l'animal.

Observatoire Cniel des Habitudes Alimentaires. Essai de lecture anthropologique et politique. Cahiers Jungiens de psychanalyse. Clarendon Press First Printed Editions Droits des Animaux. Sang de la Terre France. Livre II, chapitre XI. Pratiques de recherche et engagements. Essai de sociologie historique. Creating downloadable prezi, be patient.