Physiology of behavioral mutants of Rhizobium meliloti: evidence for a dual chemotaxis pathway.

Wild-type and nonchemotactic mutant strains of Rhizobium meliloti were tested for attraction to localized sites on alfalfa roots and for attraction to numerous small molecules, including sugars, amino acids, and two fractions derived from alfalfa root extracts. Four strains (carrying mutations che-6, che-11, che-12, and che-26) lost all responses and were classified as generally nonchemotactic mutants. One strain (carrying mutation che-7) lost responses to a group of structurally unrelated amino acids but retained all other responses and was classified as a putative sensory transducer mutant.

[Functional and cosmetic results in thumb replacement surgery].

The operations to replace the thumb have been proved in thalidomide embryopathy both functionally and cosmetically. The best results are achieved in the pollicisation of dolichophalangeal triphalangeal thumbs. Simultaneously existing radial club hand impairs the operative results considerably.