Hydrogen Ion Concentrations within the Ali- Mentary Tract of Insects
نویسندگان
چکیده
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 such conditions in connection with the absorption of drugs. Possible relations to the transformations of intestinal parasites (e.g. Herptemonads) are likewise suggestive and important. Chiefly as a result of qualitative experiments involving ingestion of foodstuffs containing indicators such as litmus powder, it has been stated that the anterior portion of the intestinal lumen is in general alkaline in reaction, the midgut acid, the hinder portion of the intestine faintly acid or neutral in reaction. Much variation is evident, however, in the reports of different observers t using widely divergent sources of insect material. Thus Sanford, 2 repeating and extending observations and experiments of Petrunkewitsch, was able to show that the crop of the cockroach was alkaline to litmus, "neutral" to phenolphthalein (except after ingestion of olive oil, when it was sometimes found acid to litmus), while the stomach, corresponding to the condition reported by a number of observers, was acid. On the other hand, Jameson and Atkins 3 find in the
منابع مشابه
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.
متن کاملIn situ activation of a Ni catalyst with Mo ion for hydrogen evolution reaction in alkaline solution
In this study Ni catalyst have been activated during hydrogen evolution reaction (HER) by adding Mo ions into the alkaline electrolyte. After dissolving different amounts of ammonium molybdate in the 1M NaOH as electrolyte, Ni catalyst was used as cathode for HER. Afterwards a comparison between hydrogen overpotential measured in Ni catalyst with and without in situ activation has been made; th...
متن کاملHydrogen Ion Concentration in Exudates of Pneumococcus Infection
The hydrogen ion concentration in the lesions of experimental pneumococcus infection has been estimated directly by pH determinations on exudates from living animals. For indirect evidence of an increase in hydrogen ion concentration within the lesions, the difference in sugar content between exudate and blood from animals with pneumococcus infection has been measured. With sanguinous exudate f...
متن کاملAdsorption of Cr(III) and Mg(II) from Hydrogen Peroxide Aqueous Solution by Amberlite IR-120 Synthetic Resin
In concentration of hydrogen peroxide, first, the solution should be quite pure, and then, it concentrate with methods such as vacuum distillation and cooling crystallization, because impurities in the hydrogen peroxide solution in high concentrations are causing decomposition of this substance; that is very dangerous. The purpose of this article is separation of chromium and magne...
متن کامل