Regulation of the Hydrogen Ion Concentration and Its Relation to Metabolism and Respiration in the Starfish

Regulation of the Hydrogen Ion Concentra- Tion and Its Relation to Metabolism and Respiration in the Starfish

The composition and condition of the body fluids of animals show departures from those of their environment usually corresponding to their degree of development. In the ceelenterates and sponges a free circulation of sea water accomplishes the distribution of materials. The interior and exterior are then exposed to practically the same medium. In the starfish, however, there are a closed ccelom...

Review of Metabolism, Transport and Role of Serotonin in the Body and the Relation between Serotonin and Diseases

Serotonin (5-hydroxytriptamine), one of the most important neurotransmitters, is synthesized from amino acid L-tryptophan in some neurons located in the central nervous system and intestine enterochromaffin cells . The role of this neurotransmitter is important and involves control of sexual behaviors, morality, sleep, pain, appetite, aggression, cardiovascular function and regulation of gut fu...

Stereo-Specific Transcript Regulation of the Polyamine Biosynthesis Genes by Enantiomers of Ornithine in Tobacco Cell Culture

Background: Ornithine (Orn) plays an essential role in the metabolism of plant cells through incorporation in polyamines biosynthesis, the urea cycle and nitrogen metabolism. Physiological response of the plant cells to its two enantiomers have not been widely investigated yet.Objectives: This study aimed to evaluate effect of ornithine enantiomers on exp...

The Regulation of Respiration Iii. a Continuous Method of Recording Changes in Acidity Applied to the Circulating Blood and Other Body Fluids’

The importance of a constant hydrogen ion concentration of the arterial blood to normal tissue function has been greatly stressed within the past decade. The apparent dependency of tissue acidity on blood acidity coupled with the constancy of the arterial hydrogen ion concentration in the normal individual seemed to justify this emphasis. This constancy of hydrogen ion concentration of the arte...

Hydrogen ion concenteration of the root media in relation to transpiration rates