Co-transporters:

I) Historical:

   In august 1960 in Prague, the Czech Republic Robert K.Crane discovered the mecanism of the sodium-glucose cotransport for the glucose intestinal absorption. It was the most important concerning later the carbohydrates absorption in the 20th century.

II) What are these proteins?

    Co-transporters, or coupled transporters,  are a subcategory of transporters that couple the favorable movement of one molecule with its concentration gradient and unfavorable movement of another molecule against its concentration gradient.

    According to the path of these two elements, we'll talk about symporters (ion and molécule travel the membrane in the same direction) or antiporters (these two chemical species travel the membrane in opposite directions).

http://ressources.unisciel.fr/biocell/chap2/co/module_Chap2_2.html

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Uniporters:

Uniporters are proteins which facilitate in one direction a molecule or an ion through phospholipids membranes such as the plasmic membrane. It's the opposite of the co-transporters (symporter or antiporter).

Source:Unknow

                                                             

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