What process would explain why the dyes spread through the agar?
Agar -- Agar is polymer and mixture of polysaccharides obtained from the cell wall of red algae .
Source of agar -- Gelidium and Gracilaria are the main commercial genera as source of agar .
Properties - Following properties of agar are seen --
Agar is composed of galactose based polymer of agarose and agaropectin .
Agar has similar properties structural and functional like carrageenans .
Agar is separated from red algae by contact with hot water .
Agar affects Ultra violet radiations .
Application of agar -- Agar is worldwide used, about 90% of total agar as food applications and remain used for the production of capsule for medical purposes .
Due to nature of agar that it solubilize in aqueous buffers above 40 degree centigrade .
It become a gel like at - 38 degree centigrade , which are used for separation of nucleic acids .
Agar gel is most common basic media used in form ( i ) For gel-electrophoresis. ( ii )Gel bead chromatography
Very importantly agar is used as solid media for growth of microorganisms .
Due to hydrogel nature of agar ,also improves the mechanical property of the drug delivery system .
Methods by which a medium spread in to another -- Two methods occur by which a medium can be solution , solvent having molecules or ions -
( i ) Diffusion
( ii ) Passive transport
( i )Diffusion -- In this process a substance move from high concentration to an area of lower concentration .This movement continues till a equilibrium establishes .A concentration gradient which is a form of stored energy in form of potential energy used to equalize concentration ,so this process not involves any energy .
( ii ) Passive transport --Diffusion is considered as passive transport because no energy required for the process .
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