XIV CONTENTS 



IV. The Digestion, Absorption, and Digestibility of Lipids Other than 

 Fats (continued) 



b'. The Effect of Concentration of Administered Vitamin A. 312 



c'. The Effect of Bile 312 



d'. The Effect of Fat Feeding 313 



e'. The Effect of Mineral Oil 313 



f '. A Comparison of the Utilization of Vitamin A Alcohol and 



Vitamin A Esters 313 



g'. The Effect of Emulsifying Agents 317 



h'. The Utilization of Vitamin A in Aqueous Dispersion 317 



i'. The Effect of Thyroxine 319 



)'. Miscellaneous Factors Affecting Absorption 319 



(c) The Stability of Vitamin A in the Intestine 320 



b. The Esterification of Vitamin A in the Intestinal Wall 322 



c. The Transformation of Retinene into Vitamin A 322 



(2) Vitamins D 323 



a. The Absorption of the Vitamins D from the Intestine 323 



(3) Vitamins E (Tocopherols) 326 



(4) Vitamins K 328 



a. The Absorption of the Vitamins K from the Gastrointestinal 



Tract 328 



b. The Synthesis of Vitamin K 2 in the Gastrointestinal Tract 330 



10. The Transport of Carotenoids and of Fat-Soluble Vitamins in Lymph 



and Blood 332 



( 1 ) The Transport of Carotenoids in the Lymph and Blood 332 



(2) The Transport of Vitamin A in the Lymph and Blood 333 



(3) The Transport of the Vitamins D in the Lymph and Blood 335 



(4) The Transport of the Vitamins E in the Lymph and Blood 335 



(5) The Transport of the Vitamins K in the Lymph and Blood 336 



11. The Excretion of Lipids by Way of the Large Intestine 336 



(1) The Excretion of Lipids in the Bile 330 



a. Factors Altering the Lipid Content of Bile 337 



b. Bile as a Source of Intestinal Lipids 348 



(2) The Excretion of Lipids by the Intestinal Wall 340 



(3) The Effect of the Food Ingested 342 



12. The Composition of Fecal Lipids 344 



V. Blood Lipids 349 



1 . Introduction 349 



2. The Nature of Blood Lipids. 350 



(1) Fatty Acids 351 



a. Fatty Acids in Phospholipids 352 



b. Fatty Acids in Cholesterol Esters 353 



c. Fatty Acids Combined with Protein 354 



(2) Neutral Fats 357 



(3) Phospholipids 358 



a. C. A. Preparation 360 



b. Other Lipoprotein Preparations 360 



