ABSTRACT
We report three Libyan children from one family with the syndrome diabetes insipidus, diabetes mellitus, optic atrophy and deafness, (DIDMOAD). Two children presented with diabetic ketoacidosis while one was discovered during screening of the family. All three children are alive, two of them on desmopressin (DDAVP) and insulin therapy and one on DDAVP only.
Subject(s)
Wolfram Syndrome/genetics , Adolescent , Child , Female , Humans , Libya , Male , Pedigree , Visual Fields , Wolfram Syndrome/urineABSTRACT
The phospholipid monolayer spread at a hydrocarbon-electrolyte interface can be used as a model system for the plasma membrane and its properties and structure probed by measurements of surface pressure and surface potential. To facilitate such studies, (i) the theory of the vibrating plate (Kelvin) method of measuring surface potentials is reëxamined and a new interpretation given for the potentials measured and (ii) a new apparatus for performing these measurements is described. The theory and apparatus are illustrated by measurements on films of distearoyl phosphatidylcholine at the interface between 2,2,4-trimethylpentane (isooctane) and 0.1 M NaCl.
Subject(s)
Membranes, Artificial , Phospholipids , Cell Membrane/physiology , Electrolytes , Hydrocarbons , Mathematics , Membrane Potentials , Models, BiologicalABSTRACT
Measurements of surface pressure of surface potential are reported for films of distearoyl phosphatidylcholine (density range: 0.15--2.65 . 10(18) molecules/m2) spread at the interface between 2,2,4-trimethylpentane and 100 mM NaCl. Low density behavior of the surface pressure is explained using classical viral theory. The behavior of the surface potential is qualitatively explained for all densities in terms of the dipole moments associated with the carboxyl groups and headgroups of the phosphatidylcholine.
