The passage discusses recent advancements in various biochemical and physiological fields. Frank and Gaffron explore the metabolism of green and purple bacteria, focusing on photosynthetic carbon dioxide reduction and the oxidation of hydrogen donors. Norman and Fuller's article on cellulose decomposition highlights the importance of mixed and pure cultures in understanding the breakdown of plant residues. Barron and Krebs review carbohydrate metabolism, with Krebs detailing oxidative changes and Barron focusing on fermentation steps. Lippman emphasizes the role of phosphate bonds in metabolic reactions. Wood and Werkmann demonstrate heterotrophic carbon dioxide assimilation in bacteria and animal tissues. Hoffmann and R. J. Williams discuss the structure and functions of biotin and pantothenic acid, respectively, highlighting their roles in growth and nutrition. Dam and Pfifner cover vitamin K and adrenal cortical hormones. Other articles on glycogen, Aspergillus respiration, and bacteriophage properties are also mentioned. The passage concludes with a review of a laboratory manual by Dr. C. S. Piper on soil and plant analysis, praising its practical and precise methods for soil and plant inorganic constituent determination.The passage discusses recent advancements in various biochemical and physiological fields. Frank and Gaffron explore the metabolism of green and purple bacteria, focusing on photosynthetic carbon dioxide reduction and the oxidation of hydrogen donors. Norman and Fuller's article on cellulose decomposition highlights the importance of mixed and pure cultures in understanding the breakdown of plant residues. Barron and Krebs review carbohydrate metabolism, with Krebs detailing oxidative changes and Barron focusing on fermentation steps. Lippman emphasizes the role of phosphate bonds in metabolic reactions. Wood and Werkmann demonstrate heterotrophic carbon dioxide assimilation in bacteria and animal tissues. Hoffmann and R. J. Williams discuss the structure and functions of biotin and pantothenic acid, respectively, highlighting their roles in growth and nutrition. Dam and Pfifner cover vitamin K and adrenal cortical hormones. Other articles on glycogen, Aspergillus respiration, and bacteriophage properties are also mentioned. The passage concludes with a review of a laboratory manual by Dr. C. S. Piper on soil and plant analysis, praising its practical and precise methods for soil and plant inorganic constituent determination.