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Use of a composite based on guidelines proposed by the AACE, TOS, and the ASMBS appears to be effective for preventing iron and vitamins A, B1, B12, and D deficiencies in the LRYGB patients during the first postoperative year. Separation of calcium and Fe does not need to be mandatory. Even with simplification, compliance is far from universal.

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Acyl carrier protein (ACP) has been purified from the facultative phototrophic bacterium Rhodobacter sphaeroides. The ACP preparation was greater than 95% homogeneous as determined by native and disodium dodecyl sulfate (Na2DodSO4)-polyacrylamide gel electrophoreses and N-terminal amino acid analysis. Amino acid compositional analysis revealed that the protein contains approximately 75 amino acids, has a calculated minimum molecular weight of 8700, and lacks the amino acids tyrosine and tryptophan. The presence of the characteristic 4'-phosphopantetheine prosthetic group was indicated by the occurrence of equimolar quantities of beta-alanine and taurine in amino acid hydrolysates and was confirmed by independent chemical analysis. The protein displayed a pI of 3.8 and had a calculated partial specific volume of 0.732 mL/g. The primary structure of the protein has been determined for the first 46 amino acid residues from the N terminus of the molecule, and the region of the molecule encompassing the amino acids from residues 31 to 44 was found to have 100% homology with the identical residues in Escherichia coli ACP. In contrast to E. coli ACP, R. sphaeroides ACP migrated according to its molecular weight during Na2DodSO4 gel electrophoresis, was resistant to pH-induced denaturation, and comigrated with the cis-vaccenoyl-ACP derivative during native gel electrophoresis. It is proposed that the basis for these properties is the enhanced hydrophobic character of the protein.

Wood samples from Populus deltoides Marsh. were used to investigate the relationship of gelatinous fibers to the size and number of other wood elements. An increase in the amount of gelatinous fibers was related to a decrease in diameter and an increase in wall thickness of non‐gelatinous fibers. The relative sizes of rays, vessels, and fibers were inter‐related, but all of these wood elements decreased in size with an increase in the amount of gelatinous fibers. Apparently environmental conditions controlling the differentiation of gelatinous fibers also influence the development of associated wood elements. Thus, the adverse physical properties of reaction wood must be attributed to all of these structural differences in the wood and not merely to the presence of large numbers of gelatinous fibers.

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