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Biomedical subjects

R E Marsh

Publications and source records attributed to R E Marsh.

At least 19 recordsLinked to original sources
PubMed1992

A chiral N-crotonyloxazolidinone Diels-Alder adduct.

(4S)-4-Benzyl-3-[(4S,5S)-(1-methoxy-5-methylcyclohexen-4- yl)carbonyl]-2-oxazolidinone, C19H23NO4, M(r) = 329.40, monoclinic, P2(1), a = 11.453 (3), b = 7.163 (4), c = 11.929 (2) A, beta = 111.86 (2) degree, V = 908.3 (5) A3, Z = 2, D chi = 1.20 g cm-3, lambda (Mo K alpha) = 0.71073 A, mu = 0.79 cm-1, F(000) = 352, T = 297 K, R = 0.034 for 885 reflections with Fo2 greater than 0. The molecule is extended in the crystal; there is a small twist, -13.1 (2) degree, about the amide-like C--N bond joining the oxazolidinone ring to the carbonyl group. The configurations at the two optical centers in the cyclohexene ring confirm the anticipated stereospecificity of the Diels-Alder cycloaddition synthesis.

Benzyl Compounds↗
PubMed1988

Structure of C32H34N2O5S2: corrigendum.

The structure of this compound [Olszak, Stepień, Wajsman, Grabowski, Glinka & Lecocq (1987). Acta Cryst. C43, 2169-2171], which contains a 13-membered heterocyclic ring, was described as triclinic, space group P1, with a = 12.756 (3), b = 9.950 (3), c = 13.566 (3) A, alpha = 90.49 (1), beta = 118.04 (1), gamma = 90.04 (1) degrees, Z = 2. It should be described as monoclinic, space group C2/c, with a' = 23.947 (6), b' = 12.756 (3), c' = 9.950 (3) A, beta' = 90.57 (3) degrees, Z = 4. The C2/c coordinates are given. The molecule lies on an exact, rather than an approximate, twofold axis.

Crystallography↗
PubMed1988

The structure of Te(OH)6.Na3P3O9.K3P3O9.

The structure of this compound, originally described in space group C2/c [Averbuch-Pouchot & Durif (1987). Acta Cryst. C43, 1653-1655] is properly described as rhombohedral, space group R3c, with a = 12.355 (4) A, a = 51.01 (2) degrees, Z = 2. (Hexagonal cell: a = 10.640 (4), c = 32.16 (2) A, Z = 6). Revised coordinates are given.

Crystallography↗
PubMed1988

More space-group changes.

Revised structures are reported for 19 crystalline compounds, based on space groups of higher symmetry than originally reported. In four cases the Laue symmetry is changed, one from 1 to 2/m and three from 2/m to mmm; in the remaining fifteen a center of symmetry has been added. For eight of these latter compounds we have obtained F values and carried out least-squares refinements in the centrosymmetric space groups, with more satisfactory results than originally reported.

Crystallography↗
PubMed1982

Aid to Families with Dependent Children: characteristics of recipients in 1979.

In March 1979, 10.4 million persons were receiving Aid to Families With Dependent Children (AFDC). Nearly 70 percent of these recipients were children and most of the remainder were mothers. At that time, most AFDC families had only one or two children, were headed by women, and lived in a metropolitan area. Comparison with earlier surveys reveals that the number of children and other recipients per household has been declining in recent years, that the proportion of blacks on the rolls has diminished slightly, and that AFDC parents are younger and better educated than they used to be.

Adolescent↗
PubMed1981

The income and resources of the elderly in 1978.

The Social Security Administration (SSA) recently released two publications dealing with the economic situation of persons aged 55 and older in 1978. These reports--Income & Resources of the Aged, 1978 (a chartbook containing 17 charts and brief explanatory paragraphs) and Income of the Population 55 and Over, 1978 (a staff paper containing 43 tables and supporting text)--are the most recent in a series of analyses of the aged population begun by SSA 40 years ago. By means of selected findings, tabulations, tables, and charts, this article presents a sampling of the information available in the two publications. The reports reveal that the aged as a group are no longer disproportionately poor compared with the adult population as a whole, and that the 1978 income of most elderly units had kept pace with inflation since 1976, the next most recent survey year.

Age Factors↗
PubMed1980

Socioeconomic status of Indochinese refugees in the United States: progress and problems.

The Social Security Administration is responsible for administering assistance programs not only to needy citizens but also to lawfully admitted aliens who require such aid. It therefore is interested in the economic situation of all the Nation's inhabitants, including refugees. This article examines the status of one such group--the Indochinese refugees who came to this country following the fall of the South Vietnamese government in 1975. A series of sample surveys, commissioned by the Department of Health, Education, and Welfare, reveals that most members of the original group of 130,000 Indochinese had achieved a large measure of economic self-sufficiency by the end of 1978. In the fall of that year, however, a new wave of Indochinese refugees began emigrating to the United States. The latecomers--who now outnumber the original group--are generally poorer, less well educated, and less acclimated to urban living than were their predecessors. Such characteristics suggest higher future resettlement costs, which could well be exacerbated by the propensity of ethnic groups to cluster in a few areas.

Adolescent↗
PubMed1973

Prospects of chemosterilant and genetic control of rodents.

This paper discusses some requirements of an ideal rodent chemosterilant, analyses the advantages of chemosterilants over other control methods, and compares the potential values of chemosterilants that affect females, males, and both sexes. Examples are given of specific situations where chemosterilants will be valuable in rodent control, together with suggested methods of applying them. The theory and practicability of using genetics in rodent control are also discussed. Neither the chemosterilant nor the genetic method is expected to become a panacea, but their eventual application will be a significant advance in rodent-control technology. Since both approaches are based on sound biological principles and are relatively safe, they should be helpful in regulating rodent populations in the future.

Animals↗
PubMed1971

Crystal structure of L-N-acetylhistidine monohydrate: an open and closed case.

L-N-Acetylhistidine crystallizes from aqueous solution as the monohydrate. The crystals are triclinic, space group P1, with two formula units per cell. The structural solution was accomplished by direct methods. The two independent molecules have very different conformations, one open and one closed. These two conformations are compared with those found in other histidine structures.

Acetates↗