Why Do Bacterial Outer Membranes Burst When Frozen

Freezing. Freeze-thaw cycles work by formation of ice crystals and cell expansion upon thawing, ultimately leading to rupture.

Why does the outer membrane of gram bacteria need to be somewhat permeable?

Although outer membrane components often play important roles in the interaction of symbiotic or pathogenic bacteria with their host organisms, the major role of this membrane must usually be to serve as a permeability barrier to prevent the entry of noxious compounds and at the same time to allow the influx of …

What is the name of the type of protein that makes the outer membrane of Gram-negative bacteria permeable to small molecules?

In the outer membrane of Enterobacteriaceae, trimeric porins control the cellular uptake of small molecules, including nutrients and antibacterial agents. The relatively slow porin-mediated passive uptake across the outer membrane and active efflux via efflux pumps in the inner membrane creates a permeability barrier.