The assumption here is one of cells reaching (near) confluence and requiring passage into fresh media at lower cell density. For tumor samples, some passage may be necessary to reduce numbers of unwanted cells (blood, fibroblast, etc.) that typically come along for ride when tissue is extracted.Yes, cells could be different after too much growth-especially tumor and tumor-derived cells.ADD COMMENT â¢ link written 5.0 years ago by Larry_Parnell â¦ 15k 1 Also AFAIK, this is the correct definition of passage. little off-topic, but hopefully someone will be able to help. I don't understand what low-passage means in this context. Example usage: 34 primary tumours and eight tumour-derived low passage cell lines were analyzed.
Fluorine is the lightest. Halogens are Group 17 or VII/VIIA of the periodic table just look at the topmost element in that group which is Fluorine (Y).
Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of circa 7000100800000000000â 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.