HYDROGEN ION CONCENTRATIONS WITHIN THE ALIMENTARY TRACT OF INSECTS

Hydrogen Ion Concentrations within the Alimentary Tract of Insects

Larvae of Psychoda and of Chironomus (diptera) maintained in solutions of appropriate indicators show that the typical acidities (pH) prevailing within the several regions of the digestive tract are: esophagus 7.1; cardiac chamber 6.2; mesenteron 7.5; the latter being functionally an intestine. The acidity of the hindgut, pH 6.4, is due to the discharge of the malphigian tubules.

Hydrogen Ion Concentrations within the Ali- Mentary Tract of Insects

There has been a good deal of discussion as to the digestive and absorptive functions respectively pertaining to the several divisions of the intestinal tract of insects. The actual acidifies prevailing in the various regions of the gut are of special moment. Among other points of interest, questions arise as to the conditions of enzyme activity within the gut, and as to the possible r61e of su...

Hydrogen Ion Concentrations in the Blood of Insects

The range of pH values for the blood of grasshoppers and of houseflies is 7.2 to 7.6. The range of values for roaches is 7.5 to 8.0. The range for Malacosoma americanum is 6.4 to 7.4; and the range for Bombyx mori is 6.4 to 7.2. From the work of other investigators and from the writer's results, it is apparent that the pH of insect blood, in general, may vary between 6.4 and 8.0. In the forms o...

Diseases of the Alimentary Tract

(Pp. xiii + 411; figs. 60. 60s.) London: William Heinemann Medical Books, 1963. THE appearance of this book is an important event. There has not been for many years a standard British textbook of gastroenterology, and recent attempts to supply one have not been so successful as one could have wished. The authoritative and massive three-volume work of Bockus is the stand-by of every gastroentero...

Hamartomas in the alimentary tract.