Lamella (cell biology)
|This article needs additional citations for verification. (March 2014) (Learn how and when to remove this template message)|
A lamella (plural, lamellae), in cell biology, is used to describe numerous plate or concentric layers or disc-like structures at both a intra-cellular(thylacoids, E.R., Mesosomes of blue green algae),cellular, tissue (Bone- Haversian system) and higher level.
An example of this being an extension of a thylakoid within a chloroplast, linking a thylakoid within one granum to one in another. They are the sites of photosystem I. Simply put, lamellae may be considered as a multiple parallel or concentric layers of of membranes as in chlorophyll.
Chloroplasts are characterized by a system of membranes embedded in a hydrophobic proteinaceous matrix, or stroma. The basic unit of the membrane system is a flattened single vesicle called the thylakoid; thylakoids stack into grana (sing, granum). All the thylakoids of a granum are connected with each other, and the grana are connected by intergranal lamellae.
It is placed between the two primary cell walls of two plant cells and made up of intracellular matrix. The lamella comprises a mixture of polygalacturons (D-galacturonic acid) and neutral carbohydrates. It is soluble in the pectinase enzyme.
- Oxford Dictionary of Biochemistry and Molecular Biology, Oxford University Press
Lipid lamellar, micellar and hexagonal phases: YashRoy R.C. (1990), Lamellar dispersion and phase separation of chloroplast membrane lipids by negative staining electron microscopy. Journal of Biosciences, vol. 15(2), pp. 93-98.
|This cell biology article is a stub. You can help Wikipedia by expanding it.|