Psychosocial development of the radiography student.

The psychosocial development of radiography students is discussed. A developmental framework of radiography education is presented, along with stresses that may impede the development of radiography students. Some strategies for prevention of such stresses are given also.

A continuum for evaluating risks and benefits of ionizing radiation.

Most texts and studies analyzing risks and benefits of ionizing radiation use a "risk-comparison" method in which the benefits of ionizing radiation are not considered. This article describes a method designed to weigh both risks and benefits.

A biochemical study of the reconstitution of D-lactate dehydrogenase-deficient membrane vesicles using fluorine-labeled components.

Fluorine-19 labeled compounds have been incorporated into lipids and proteins of Escherichia coli. 19F-Labeled membrane vesicles, prepared by growing a fatty acid auxotroph of a D-lactate dehydrogenase-deficient strain on 8,8-difluoromyristic acid, can be reconstituted for oxidase and transport activities by binding exogenous D-lactate dehydrogenase. 19F-Labeled D-lactate dehydrogenases prepared by addition of fluorotryptophans to a tryptophan-requiring strain are able to reconstitute D-lactate dehydrogenase-deficient membrane vesicles.

Radiographers' knowledge of aging.

A Facts on Aging Quiz (FAQ) was given to a survey group of radiographers and students. As a group, radiographers were found to be as well educated as any other group of health care professionals. A progression was seen from student to graduate radiographer; the contention is made that early clinical experience may be responsible for much of the knowledge radiographers have about aging.

Nuclear magnetic resonance line-shape analysis of fluorine-19-labeled phospholipids.

The application of a fluorine-19 probe to the problem of motions present in the hydrophobic region of phospholipid dispersions and biological membranes has been extended to the study of phospholipids labeled with fluorine-19 in the 8 position and with deuterium in the 2, 7, and 9 positions of the 2-acyl chain. 1-Myristoyl-2-(8,8-difluoro[2,2,7,7,9,9-2H6]myristoyl)-sn-glycero-3- phosphocholine and its nondeuterated analogue have been investigated by 19F nuclear magnetic resonance at 282.4 MHz.

Disease in the elderly: social factors.

Hypochondriasis, the most common social problem as regards disease in the elderly, is discussed, with some possible strategies for action by the radiographer.

Deuterium NMR of specifically deuterated fluorine spin probes.

Deuterium nuclear magnetic resonance spectra (at 55.3 MHz) have been obtained of 19F-2H double-labeled phospholipids in pure lipid bilayers, and of 2H-labeled lipid in a 19F-labeled bilayer, as a function of concentration, to assess the perturbing influence of 19F sites in lipid hydrocarbon chains. Order parameters of 2H-labeled sites adjacent to C-8 myristic fluorine probes in pure lipid bilayers, and 19F spin label order parameters themselves, are about 30% lower than those deduced from the use of nonperturbing 2H probes.

A proton nuclear magnetic resonance investigation of histidine-binding protein J of Salmonella typhimurium: a model for transport of L-histidine across cytoplasmic membrane.

Genetic evidence suggests that the high-affinity L-histidine transport in Salmonella typhimurium requires the participation of a periplasmic binding protein (histidine-binding protein J) and two other proteins (P and Q proteins). The histidine-binding protein J binds L-histidine as the first step in the high-affinity active transport of this amino acid across the cytoplasmic membrane. High-resolution proton nuclear magnetic resonance spectroscopy at 600 MHz is used to investigate the conformations of this protein in the absence and presence of substrate.

Preparation of laurylsarcosyltaurine: a surface active constituent of crab gastric juice.

The conditions for the preparation of laurylsarcosyltaurine from lauric acid and sarcosyltaurine, a crystalline dipeptide, are described. The preparation of sarcosyltaurine from the reaction of taurine and the mixed anhydride of benzyloxycarbonylsarcosine and isobutyl chloroformate is also described.

Crustacean intestinal detergent promotes sterol solubilization.

Although crustacean tissue cholesterol content is high, Crustacea, like other arthropods; are incapable of cholesterol synthesis, and presumably are dependent for maintaining tissue cholesterol stores on the intestinal absorption of ingested sterol. A detergent, N-(N-dodecanoylsarcosyl)taurine, representative of a set of detergents synthesized by the crustacean hepatopancreas and secreted into the intestine, is capable of efficient cholesterol solubilization, and thus of promoting sterol absorption.