Social transmission of food preferences: An adaptation for weaning in rats.

Comparison of the extent of social influence on the feeding site selection of 24 adult and 58 weanling domesticated rats revealed that social interaction was a far more potent factor in determining the diet selection of weanlings than of adults. The social transmission of diet preferences is discussed as an adaptation of greatest importance during the weaning period. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Lymphography in patients with suspected malignancy or fever of unexplained origin

Forty-four patients underwent bipedal lymphography for evaluation of fever of unexplained origin, or because a malignant tumor (usually lymphoma) was suspected clinically. Extensive prior medical evaluation was inconclusive. The lymphograms were of no apparent value in detecting the etiology of the illness. Reactive follicular hyperplasia was frequently seen and sometimes simulated lymphoma on the lymphogram. The primary value of lymphography in such cases is as an aid in planning biopsy and surgery.     

Contrast enhancement of LED,vaccum fluorescent and plasma displays with circular polarizing filters

Filters are widely used for contrast enhancement of active electronic displays. This paper considers the application of circular polarizers to LED, vacuum fluorescent and plasma displays under a variety of ambient illumination situations. Relevant parameters controlling contrast enhancement have been identified. The degree of contrast enhancement obtained with appropriate circular polarizing filters under different ambient illumination values is reported for each display type. These values are compared with those obtained using non-polarizing chromatic filters. In general, when contrast is being degraded by specular reflections of ambient light, the circular polarizing filters improve contrast to a much greater extent than the non-polarizing filters.     

Subtle transchondral fractures of the talar dome: a radiological perspective

Radiographic findings associated with small talar dome fractures were analyzed in 21 patients. Representative cases are presented. The classification of talar dome fractures, and the role of the radiologist in their evaluation, are discussed.     

Antibodies to Candida after operations on the heart

In order to determine the frequency of hypoxaemia and to evaluate the role of increased closing capacity in producing hypoxaemia in patients with cirrhosis of the liver, 13 patients with well-established cirrhosis were studied. Arterial blood gases, spirometry, lung volume, and closing capacity measurements were made with the patients in the seated and recumbent positions after exclusion of cardiopulmonary dysfunction. Four of 13 and six of 12 patients exhibited significant hypoxaemia in the seated and recumbent positions respectively. Five of 13 patients showed a closing capacity greater than predicted. This frequency of increased closing capacity was not higher than in a group of smokers of the same age. Unlike Ruff et al. (1971), we did not find a consistent relationship between hypoxaemia and closing capacity.     

Novel taste facilitation of the association of visual cues with toxicosis in rats.

Conducted 3 experiments with 118 male Long-Evans rats to examine the conditions under which rats rapidly learn to avoid ingesting visually distinctive food objects associated with toxicosis. It was found that the presence of a novel taste associated with a visually distinctive food object facilitated acquisition of visual-cue/toxicosis associations. Further experiments failed to support either higher order conditioning or sensory preconditioning models of this phenomenon. Results are discussed in terms of species differences in the conditions under which attention is directed to visual cues associated with ingesta. The implications of these findings for the existence of visual aposematisms (warning colors) in naturally occurring toxic species are also examined. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)