Laboratory Instruments

1. A phonograph turntable reaches its speed of 33 rpm after making 1.7 revolutions. What was its angular acceleration? 2. A centrifuge accelerates from rest to 15,000 rpm in 220 s. Through how many revolutions did it turn in this time?

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It is on a centrifuge. I need to set it up so that if the cover is open, the motor stops. I have a cutout switch that cuts the power to the motor, but in order to stop it, the centrifuge has to be put in reverse for approx. 1-2 seconds. Either that or find [...]

Tags: Electric, Help, Motor, Need, Stopping, With

I am 28 and I have been on the pill for several years (with yearly interruptions). The last two times I stopped using the pill my period was three months late (so I had one period every three months) and when it finally came, it was very little and for a short period of time [...]

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bacteriophage production

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I am a 21 year old female. I’m NOT sexually active (still a virgin). Is it still necessary that I go for an annual gynecological exam?

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I was thinking of asking my doctor about using the pill to control my acne and I was wondering if I’ll need any tests in order to get this. I’ve heard about needing a gynecological (sp?) exam and/or blood tests even if it is just for acne. Is this true?

Tags: Birth, Blood, Control, Need, Test

I am a Bio-Medical engineer and repair Medical equipment. We often discard medical equipment that is outdated or there are newer models available. I know that you need a license to re-sell, but what type of license would I need to have and where do I get it? I live in Florida and don’t know [...]

Tags: Equipment, Kind, License, Medical...., Need, Resell, What

The cells need to be kept cool until they are ready to accept the plasmid you are transforming them with. If you allow them to warm up, they will start to grow and fewer will be competent and that will lower your transformation efficiency.

Tags: Cell, Centrifuge, Competent, Need, Temperature

If you don’t balance the tubes when you centrifuge, the weight imbalance will cause the centrifugal core to break. When spinning at extremely high RPMs, the G force attributed to each tube in the centrifuge can change drastically even with a small weight imbalance. It’s important to balance the tubes or your very expensive centrifuge [...]

Tags: Balance, Centrifuge, Need, Tube

competent cells have to stay cold…warming them too quickly will kill the cells so they have to stay at a cold temperature, even when centrifuging

Tags: Cell, Centrifuge, Competent, Need, Temperature