Showing papers by "Long Island University published in 1971"

Mucopolysaccharide Which Regulates Growth in Neurospora

Abstract: Neurospora produces a mucopolysaccharide (called MP) which inhibits its growth, causes vacuolation and agglutination of its cells, and precipitates its purified membrane protein. Cultures of a colonial strain display a phase of slow growth; the induction of this phase is traced to the production of MP by the mold. Stationary-phase cultures of wild type also produce MP. MP is a polymer of galactosamine, its amino groups only partially acetylated, probably containing other minor components. MP molecular weight is approximately 106. Complete acetylation abolishes the biological activities of MP. It is suggested that the regulatory effect of MP is mediated by its interaction with the protoplasmic membrane.

Nonexistence of a Positron—Hydrogen-Atom Bound State

Abstract: One needs a necessary condition (rather than a sufficient condition, such as that of Rayleigh-Ritz) to even attempt to prove that a given bound state cannot exist. We use an adiabaticlike method to show that a positron (${e}^{+}$) and a hydrogen atom (H) cannot form a bound state. The separation $r$ (but not $\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}}$) of the proton ($p$) and ${e}^{+}$ is fixed; working in a subspace of zero total angular momentum, we calculate the lowest energy ${E}_{\mathrm{e}1}(r)$ of the electron in the field of ${e}^{+}$ and $p$. An effective one-body $p+{e}^{+}$ potential is then defined by ${V}^{(1)}(r)={E}_{\mathrm{e}1}(r)+\frac{{e}^{2}}{r}+\frac{{e}^{2}}{2{a}_{0}}$. The necessary condition for the existence of a bound state of the true $\mathrm{H}+{e}^{+}$ system is the existence of a bound state of an artificial $p+{e}^{+}$ system with an interaction ${V}^{(1)}(r)$. This one-body problem is readily solved, and we find that it (and therefore the true problem) has no bound state. The proof is not rigorous since ${E}_{\mathrm{e}1}(r)$ is not determined exactly, but the accuracy attained is such as to make the existence of an $\mathrm{H}+{e}^{+}$ bound state extremely unlikely. A by-product of the calculation is the determination of an improved lower bound on the ground-state energy of ${\mathrm{H}}^{\ensuremath{-}}$.

The Impact of Henry George on British Economists, I The First Phase of Response, 1879-82; Leslie, Wicksteed and Hobson

Abstract: steadily increasing wealth, and its land reform message, evoked a strong response during the 1880s. Land reformers, politicians, journalists, socialists and large numbers of the general populace, as well as the professional economists, were all affected. The book had the greatest sale of any on an economic subject to that date; in fact, sales were about 100,000

Microdetermination of silver by thioacetamide using the mercury drop electrode

Abstract: A sensitive and rapid potentiometric method for the determination of mg quantities of silver is described. The silver solution is adjusted to the proper pH and temperature, and then titrated with a standard thioacetamide solution potentiometrically. A mercury drop-saturated calomel electrode pair was employed for end point detection.

Content Analysis: Tat Card 12BG—The Rowboat as a Symbol for Female Body Image and Sexual Activity:

Abstract: The symbolic meaning of stories told by mental patients in response to Card 12BG is deduced by using the guidelines set down by Phillips and Smith (1953) for content analysis.

Fear-reducing effect of graduated versus non-graduated forced exposure.

Abstract: Contrary to a prediction from counterconditioning theory, forced, graduated exposure was less effective in reducing feat than forced, non-graduated exposure. This finding was interpreted to reflect a generalization decrement in the effect of graduated exposure resulting from exposure to conditions similar to, but not the same as, those present during the acquisition of fear. It was suggested, however, that this decrement would be offset during free exposure where, in contrast to forced exposure, a graduated procedure would result in a greater amount of exposure than a non-graduated procedure.