51, in recent studies, however, we have discovered that the production and release in brain neurons of the

neurotransmitter serotonin (neurotransmitters are compounds that neurons use to transmit signals to other cells) depend directly on the food that the body processes.

52, our first studies sought to determine whether the increase in serotonin observed in rats given a large injection of the amino acid tryptophan might also occur after rats art meals that change tryptophan levels in the blood.

53, the consumption of protein increases blood concentration of the other amino acids much more, proportionately, than it does that of tryptophan.

54, this revisionist view of Jim Crow legislation grew in part from the research that Woodward had done for the NAACP legal campaign during its preparation for Brown v. Board of education.

55, Woodward confessed with ironic modesty that the first edition “had begun to suffer under some of the handicaps that might be expected in a history of the American Revolution published in 1776.”

56, Yet, like Paine, Woodward had an unerring sense of the revolutionary moment, and of how historical evidence could undermine the mythological tradition that was crushing the dreams of new social possibilities.

57, Joseph Glarthaar?s Forged in Battle is not the first excellent study of Black soldiers and their White officers in the Civil War, but it uses more solders? letters and diaries – including rare material from Black soldiers – and concentrates more intensely on Black-white relation in Black regiments than do any of its predecessors.

58, while perhaps true of those officers who joined Black unties for promotion or other self-serving motives, this statement misrepresents the attitudes of the many abolitionists who became officers in Black regiments.

59, moreover, argument pointing out the extent of both structural and functional differences between eukaryotes and true bacteria convinced many biologists that the precursors of the eukaryotes must have diverged from the common ancestor before the bacteria arose.

60, new techniques for determining the molecular sequence of the RNA of organisms have produced evolutionary information about the degree to which organisms are related, the time since they diverged from a common ancestor, and the reconstruction of ancestral versions of genes.

61, these techniques have strongly suggested that although the true bacteria indeed form a large coherent group, certain other bacteria, the archaebacteria, which are also prokaryotes and which resemble true bacteria, represent a distinct evolutionary branch that far antedates the common ancestor of all true bacteria.

62, the new tax law allowed corporation to deduct the cost of the product donated plus half the difference between cost and fair market selling price, with the proviso that deduction cannot exceed twice cost.

63, unfortunately, emancipation has been less profound than expected, for not even industrial wage labor has escaped continued segregation in the workplace.

64, to explain this unfinished revolution in the status of women, historians have recently begun to emphasize the way a prevailing definition of femininity often determines the kinds of work allocated to women, even when such allocation is inappropriate to new conditions.

65, for instance, early textile-mill entrepreneurs, in justifying women?s employment in wage labor, made much of the assumption that women were by nature skillful at detailed tasks and patient in carrying out repetitive chores; the mill owners thus imported into the new industrial order hoary stereotypes associated with the homemaking activities they presumed to have been the purview of women.

66, More remarkable than the origin has been the persistence of such sex segregation in twentieth-century industry. 67, according to a recent theory, Archean-age gold-quartz vein systems were formed over two billion years ago from magmatic fluids that originated from molten granitelike bodies deep beneath the surface of the earth.

68, however, none of these high-technology methods are of any value if the sites to which they are applied have never mineralized, and to maximize the chances of discovery the explorer must therefore pay particular attention to selecting the ground formations most likely to be mineralized.

69, in order for the far-ranging benefits of individual ownership to be achieved by owners, companies, and countries, employees and other individuals must make their own decisions to buy, and they must commit some of their own resources to the choice.