The double boundary formed by the outer chloroplast envelope membrane and inner chloroplast envelope membrane.[ref]
Separates surrounding cytosol from chloroplast intermembrane space.
Together with the inner chloroplast envelope membrane, it defines the boundary of the chloroplast. Crossing the envelope and entering the thylakoid lumen are different transport problems because the thylakoid system supplies an additional membrane barrier. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 12, 18 and 19, compartments, division and cell junctions
Separates chloroplast intermembrane space from chloroplast stroma.
Its selective transport systems help maintain the distinct composition of the chloroplast stroma. The thylakoid membrane is a separate internal membrane, so an imported molecule reaching the stroma has not automatically reached the thylakoid lumen. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 12, 18 and 19, compartments, division and cell junctions
The space between the two chloroplast envelope membranes.
It is topologically distinct from both the chloroplast stroma and the thylakoid lumen. Naming the compartments prevents a transport measurement across one barrier from being mistaken for transport across the entire chloroplast membrane system. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 12, 18 and 19, compartments, division and cell junctions
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