Histones are a family of basic proteins that associate with DNA in the nucleus and help condense it into chromatin. Nuclear DNA does not appear in free linear strands; it is highly condensed and wrapped around histones in order to fit inside of the nucleus and take part in the formation of chromosomes.he beads are called nucleosomes. Each nucleosome is made of DNA wrapped around eight histone proteins that function like a spool and are called a histone octamer.
The preparation of a ... The purpose of making a smear is to fix the bacteria onto the slide and to prevent the sample from being lost ... ... fixation is a critical step in the preparation of ... Heat fixation: After a smear has dried at ... are rarely used alone for fixing blocks unless ...
Anti-scald valves used with water heaters are also called tempering valves or mixing valves. An anti-scald valve mixes cold water in with the outgoing hot water to assure that hot water reaching a building fixture is at a temperature low enough to be safe.y manual hot water tempering valve we mean that the plumber has installed an ordinary plumbing valve and a cold water bypass pipe to mix some cold water into the water heater's outgoing hot water supply.