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In histopathology, pathologic homogenization is seen as a loss of variations, such as of collagen in lichen sclerosus (pictured).. Homogenization, in cell biology or molecular biology, is a process whereby different fractions of a biological sample become equal in composition.
While monotremes use an XX/XY system, unlike other mammals, monotremes have more than two sex chromosomes. The male short-beaked echidna, for example, has nine sex chromosomes—5 Xs and 4 Ys, and the male platypus has 5 Xs and 5 Ys. [citation needed] Platypuses are a monotreme species whose mechanism of sex determination has been extensively ...
[1] [2] Fractions are collected based on differences in a specific property of the individual components. A common trait in fractionations is the need to find an optimum between the amount of fractions collected and the desired purity in each fraction. Fractionation makes it possible to isolate more than two components in a mixture in a single run.
Nutritionally-enhanced diets allow symbiont-free specimens to survive, but they are unhealthy, and at best survive only a few generations. [ 33 ] In some insect groups, these endosymbionts live in specialized insect cells called bacteriocytes (also called mycetocytes ), and are maternally-transmitted, i.e. the mother transmits her endosymbionts ...
In cell biology, cell fractionation is the process used to separate cellular components while preserving individual functions of each component. [1] This is a method that was originally used to demonstrate the cellular location of various biochemical processes.
Bovine serum albumin (BSA or "Fraction V") is a serum albumin protein derived from cows. It is often used as a protein concentration standard in lab experiments. The nickname "Fraction V" refers to albumin being the fifth fraction of the original Edwin Cohn purification methodology that made use of differential solubility characteristics of plasma proteins.
2.The Hfr cell forms a pilus and attaches to a recipient F- cell. 3.A nick in one strand of the Hfr cell's chromosome is created. 4.DNA begins to be transferred from the Hfr cell to the recipient cell while the second strand of its chromosome is being replicated. 5.The pilus detaches from the recipient cell and retracts.
In molecular biology, post-translational modification (PTM) is the covalent process of changing proteins following protein biosynthesis. PTMs may involve enzymes or occur spontaneously. Proteins are created by ribosomes , which translate mRNA into polypeptide chains , which may then change to form the mature protein product.