Biological membrane
In medicine, microbiology, cell physiology, and biochemistry, a membrane is a lipid bilayer, typically embedded with proteins, which acts as a barrier within or around a cell.Such membranes typically define enclosed spaces or compartments, in which cells may maintain a chemical or biochemical environment that differs from the outside. For example, the membrane around peroxisomes shields the rest of the cell from peroxides, and the plasma membrane separates a cell from its surrounding medium. Most organelles are defined by such membranes.
More at cell membrane.
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The market.html">market.html">market.html">market of Tlaxcala, the ancient inhabitants of which aided Cortez in
a famous temple, overthrown by Cortez.
A typical Mexican of the lowlands of Tehuantepec.
A typical Mexican boy of the highlands.
Looking down on Maltrata as the train begins its descent.
A residence of the Isthmus of Tehuantepec.
On the banks of the Coatzacoalcos, Isthmus of Tehuantepec.
Women of Tehuantepec in the market-place.
On the hillside above Tehuantepec are dwellings partly dug out of the
and one of their decorated bowls.
A woman.html">woman of northern Guatemala.
A station of the "Pan-American" south of Tehuantepec.
An Indian boy of Guatemala on his way home from market.
Three "gringoes" on the tramp from the Mexican boundary to the railway
country.
One of the jungle-hidden ruins of Quiragua.
The last house in Guatemala, near the boundary of Honduras.
A woman shelling corn for my first meal in Honduras.
A vista of Honduras from a hillside, to which I climbed after losing the
any size in Honduras.
Soldiers of Santa Rosa eating in the market-place.
Christmas dinner on the road in Honduras.
Several times I met the families of soldiers tramping northward with all
drives his similarly laden animals.
The great military force of Esperanza compelled to draw up and face my
street.
Honduras, the Land of Great Depths.
A corner of Tegucigalpa.
The "West Pointers" of Honduras in their barracks, a part of the
coast.
A beef just butchered and hung out in the sun.
A dwelling on the hot lands of the Coast, and its scantily clad
.
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