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1. Fate of polychlorinated biphenyls, metals, and other elements in papers fed to lactating cows.

14. Ornithine degradation in Clostridium sticklandii; pyridoxal phosphate and coenzyme A dependent thiolytic cleavage of 2-amino-4-ketopentanoate to alanine and acetyl coenzyme A.

15. Platelet aggregation inhibitors. 7. S-substituted 2-thioadenosine 5'-monophosphates.

16. "Nonisomerizable" 2'-and 3'-O-aminoacyl dinucleoside phosphates. Chemical synthesis and acceptor activity in the ribosomal peptidyltransferase reaction.

17. Synthesis of some trinucleoside monophosphates of biological interest.

18. Reaction of adenosine with ethylating agents.

19. Physical identity of the SV40 deoxyribonucleic acid sequence recognized by the Eco RI restriction endonuclease and modification methylase.

20. Three new adenosine triphosphate analogs. Synthesis and effects on isolated gut.

21. Simultaneous reduction and mercuration of disulfide bond A6-A11 of insulin by monovalent mercury.

22. Derivatives of N-(N-(9-beta-D-ribofuranosylpurin-6-yl)carbamoyl)threonine in phosphodiesterase hydrolysates of wheat embryo transfer ribonucleic acid.

23. Synthesis of the vasoactive intestinal peptide (VIP).

24. Preparation and properties of the repeating sequence polymer d(A-A-T)n-d(A-T-T)n.

25. Reaction of cytidine with ethylating agents.

26. Penicillin-induced secretion of soluble, uncross-linked peptidoglycan by Micrococcus luteus cells.

28. Ribonucleic acid ligase activity of deoxyribonucleic acid ligase from phage T4 infected Escherichia coli.

29. Synthesis and properties of polyribonucleotides containing N 2 -methyl and N 2 -dimethylguanylic acid in polyguanylic acid.

30. Selective modification of the mitochondrial isozyme of aspartate aminotransferase by -bromopropionate. II. Chemical structure of the modified site.

31. Purification and characterization of two classes of immunoglobulins from the marine toad, Bufo marinus.

32. Base sequence differences between the ribosomal and "ribosomal precursor" ribonucleic acids from Ehrlich ascites cells.

33. Adenosine diphosphate translocation in mitochondria. Nature of the receptor site for carboxyatractyloside (gummiferin).

34. Substrate properties of 8,2'- and 8,3'-O-cyclo derivatives of adenosine 5'-monophosphate with adenosine 5'-monophosphate utilizing enzymes.

35. A biologically active amino-terminal fragment of bovine parathyroid hormone prepared by dilute acid hydrolysis.

36. -Fluoroadenosine triphosphate. Synthesis, properties, and interaction with myosin and heavy meromyosin.

37. Further studies on the structural differences between the isoenzymes of human parotid -amylase.

38. Chemical evidence for conformational differences between the red- and far-red-absorbing forms of oat phytochrome.

39. Angiotensin-converting enzyme inhibitors from the venom of Bothrops jararaca. Isolation, elucidation of structure, and synthesis.

40. Adenylyl imidodiphosphate, an adenosine triphosphate analog containing a P--N--P linkage.

41. Chemical and physicochemical studies of the component polypeptide chains of rabbit secretory immunoglobulin A.

42. Wall peptidoglycan in Aerococcus viridans strains 201 Evans and ATCC 11563 and in Gaffkya homari strain ATCC 10400.

43. Structural studies of calf thymus F3 histone. II. Occurrence of phosphoserine and -N-acetyllysine in thermolysin peptides.

44. Studies on adenosine triphosphate citrate lyase of rat liver. Binding site of citrate.

45. Synthesis of 5'-phosphates of the naturally occurring 6-ureidopurine ribonucleosides and their analogs.

46. Affinity labeling of bovine carboxypeptidase A Leu by N-bromoacetyl-N-methyl-L-phenylalanine. II. Sites of modification.

47. Binding of radioactive oligonucleotides to ribosomes.

48. Selective cysteine modification in glyceraldehyde-3-phosphate dehydrogenase.

49. A novel procedure for the synthesis of 2'-O-alkyl nucleotides.

50. Sulfenylation of tryptophan-62 in hen egg-white lysozyme.