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 ...
In this how-to we cover the basics of a spot welder, and then show you how to build one from a microwave oven transformer. A spot welderâs electrodes serve at least three functions. They transfer electrical energy to the material while also holding it together; this also controls resistance.pot welders are used in the fabrication of automobiles, PC cases, power supplies, microwave ovens, electrical junction boxes, Faraday cages, and various electronics.