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Hi @RUDAL.p, thanks for reaching out and sharing your interest regarding QC/QA laboratory. We appreciate your feedback and will keep this topic in mind for future discussions. Stay tuned for updates!

Thanks for your question! Oil cypionate is a viscous solution, so filtration may be challenging. The recommended product depends on the application. If the intended use is direct patient care, we recommend an FDA-registered sterile hydrophobic syringe filter such as cat. no. SLFG025LS. In a lab setting, we offer research use-only options such as 0.45µm hydrophobic PTFE syringe filters (such as cat. no. SLFH033N) or a syringe filter designed for high particulate filtration (such as cat. no. SLCRM25). Hope this helps!

@@milliporesigma2407 thank you

Thank you so much for your question! These cassettes are made of polystyrene and, therefore, cannot be autoclaved. They are intended for single use. If you have any further questions, please feel free to ask.

Hi @sulaimanalswari7977 - If you're looking to purchase our Reflectometer RQflex® 20, please visit our site (make sure the correct country is selected in the top right corner): ms.spr.ly/6058Y9lKM

Hi @faisalmian3348 - To purchase the Millicell Digital Cell Imager, please visit our website: ms.spr.ly/6052Y3Evk Please ensure the correct country is selected in the top right hand corner. Let us know if you have any other questions!

Hi @isaacgonzalez9768 - Thanks for your question! For a fuel test, we recommend that plastic bottles and glass are not used due to the reaction on the chemistry of the system. Please see below the recommended bottle on our website (please make sure the correct country is selected in the top right hand corner): ms.spr.ly/6055Y3EmP

Thanks for your question! There are many variables that can contribute to how long cells are viable for in -80˚ C storage, including cell type and the type of cryopreservation medium that the cells are stored in. Generally, cells will not maintain as high a level of viability when stored in -80˚ C vs standard storage in liquid nitrogen. For more information about storing cells in -80˚ C storage, please contact Technical Services: ms.spr.ly/6056cLY5i (please ensure the correct country is selected in the top right corner).

Great question! We don't have a specific protocol for LAL testing of syringe filters. However, there are kits available, such as this - ms.spr.ly/6059cjeht - that can be used. (Please select the correct country and language in the top righthand corner of your screen.) Filter endotoxin-free water through the syringe filter, then test the filtrate to see if it contains endotoxin. The product information sheet has instructions on how to use the kit. Note that this kit is for research-use only. There are other LAL/endotoxin kits as well, a quick online search will give you some options. If your lab needs to comply with a compendial method (e.g. USP, EP), make sure that the kits you are using are compliant with the method described in the monograph. Please let us know if you have any other questions! Happy to help.

Hi Anita - It's recommended to spin for 2 minutes at 1,000 x g. For Microcon, 1,000 x g for 3 minutes. Please let us know if you have any other questions!

Thanks for your question! Serum is diverse in components, but batches can vary in growth-promoting factors, causing cell culture variations. To address this, we offer serum-reduced and serum-free media with defined factors like cytokines, hormones, or vitamins for consistent culture conditions. Please let us know if you have any other questions!

@@milliporesigma2407 thank you

Correct

You do understand you can see a rainbow under water that’s created by the Suns light just simply passing through the water? There’s no such thing as a firmament, as in a sold glass dome, the earths atmosphere is made up of different types of gas, & those gasses are a fluid. The molecules that make up the gasses have a crystal structure, & water has the most crystal structure out of all the other gasses, so when light passes through it, it gets refracted, & reflected ( Like a prism ) an that causes you to be able to see the different wavelengths of light 🌈

​@@clintnovay995 Why o' why the need for a mirror at all then, when recreating this phenomenon indoors ;-)

After aspirating the wash media, gently resuspend the remaining cell pellet in a small volume of pre-warmed culture media by pipetting up and down. Suspension volume and flask size is determined by the number of cells that were recovered.

Gracias por tu mensaje. Para obtener ayuda con nuestros productos Stericup, contáctenos a través de nuestra página de atención al cliente: www.sigmaaldrich.com/support/customer-support

Hey Evren, we uploaded the wrong version first time round! 😬

Thanks for the feedback - we're glad you like it!

Absolutely! Thanks for pointing that out 🥰

Hi Thays, thanks for flagging this. Here is the link to part one of this two part video series: ms.spr.ly/60589BDX4

Hi pankajphr, thanks for reaching out. There is only one part.

Hi pankajphr, thanks for reaching out. Part 1 is available in the following locations: ms.spr.ly/60519BDnV