Search PubMed⌕ Search

Biomedical subjects

A Harvey

Publications and source records attributed to A Harvey.

At least 55 records · Page 3Linked to original sources
PubMed1991

Effects of morphine and naloxone upon the reactions of rats to a heat stressor.

Five experiments used rats to examine the conditioned hypoalgesia induced by exposure to a heated floor. Experiments 1 and 2 demonstrated that this hypoalgesia is mediated by non-opioid mechanisms of pain control, as evidenced by insensitivity to the opioid antagonist naloxone and by the absence of cross-tolerance with the opioid agonist morphine. Although non-opioid in nature, the acquisition of conditioned hypoalgesia was facilitated by naloxone and impaired by morphine (Experiments 3 and 4). These effects did not appear to be due to an opioid regulation of pain. (1) Pairing morphine with the heated floor attenuated acquisition in drug-tolerant rats. (2) This attenuation by morphine was removed when naloxone was given after exposure to the heated floor. (3) Conditioning was facilitated when naloxone was given after exposure to the heated floor (Experiment 5). The results were discussed in terms of an opioid regulation of (a) surprise, (b) arousal of an aversive motivational system, and (c) the affective component of pain.

Animals↗
PubMed1989

Possible involvement of chromosome 1 in in vitro immortalization: evidence from progression of a human adenoma-derived cell line in vitro.

We have previously reported that continuous in vitro passage in the presence of 3T3 feeders of a non-tumorigenic adenoma-derived epithelial cell line, designated PC/AA, resulted in its becoming immortal. At early passage PC/AA was normal diploid, whereas every cell of PC/AA late passage had an isochromosome 1(q) which led us to suggest that abnormalities of chromosome 1 may be involved in tumour progression. We now report the isolation of a 3T3-feeder-independent variant of early-passage PC/AA, designated PC/AA/FI, which was immortal in vitro and remained non-tumorigenic. Each cell of PC/AA/FI again has an isochromosome 1(q), like the late-passage PC/AA. However, with PC/AA/FI it is the other chromosome 1 of the homologous pair which is involved in the formation of the isochromosome 1(q). This is possible to determine because of the polymorphic centromeric heterochromatin on chromosome 1 of the early-passage PC/AA. With the late-passage PC/AA (grown with 3T3 feeders) the homologue with the large C-band has given rise to an isochromosome 1(q) whereas with PC/AA/FI it is the other homologue with the smaller C-band which has given rise to this isochromosome. Both the immortal PC/AA/FI and the immortal PC/AA late passage, therefore, have independent abnormalities involving chromosome 1. These results indicate that chromosome 1 may be involved in in vitro immortalization.

Adenoma↗
PubMed1986

Treatment of orbital pseudotumors and lymphoma.

Thirty-seven patients were identified in a retrospective review at Hahnemann University and Wills Eye Hospital; they had been treated for pseudotumor or lymphoma of the orbit and had adequate follow-up (x = 61.5 months). Overall, 31 of 37 patients (83.8%) were cleared of their orbital disease. Of the nine patients treated for lymphoma, all were cleared of disease in the orbit. Twenty-two of 28 patients (78.6%) with benign disease were likewise cleared of orbital disease. Ten of 10 patients who received radiation as their initial therapy were cleared. Overall, 17 of 20 (85%) of patients who received radiation as part of their therapy were cleared of orbital disease, with mean dosages of 2,166 cGy (1 cGy = 1 rad) for benign disease and 3,547 cGy for lymphoma. Brief representative case studies and a review of the literature are presented. Two patients with benign disease were cured of disease in the orbit but went on to develop systemic lymphoma. Radiation therapy plays an essential role in the management of patients with orbital lymphomatous diseases.

Adolescent↗
PubMed1985

Hiring smart.

Explore the source record for details and available documents.

Humans↗
PubMed1984

Comparing tiltmeters for crustal deformation measurement--a preliminary report.

A collection of high-precision tiltmeters is being operated at Pinon Flat Observatory, southern California, both to compare instruments and to measure tectonic deformation. We report on 1.2 years of data from four of these: two Michelson-Gale long fluid tiltmeters, one long center-pressure tiltmeter, and a shallow borehole tiltmeter. The three long-base instruments are all located on the same baseline, with a precise leveling line running between their end-monuments. At nontidal frequencies, only the two Michelson-Gale instruments show some coherence (gamma 2 = .3 for periods of 2 to 4 days), while the center-pressure instrument is correlated with air temperature at periods from a few days to a few weeks. The most stable tilt record shows a secular rate of 0.28 mu rad/a, which may be real. Over much longer times, leveling to specially stabilized bench-marks should confirm this. Comparing instruments has identified more and less successful measurement techniques; it appears that low-noise data will most probably be produced only by relatively complex and expensive instruments, though even for these, the operating costs over any reasonable lifetime will exceed the capital cost. Even the best existing sensors must be improved to measure continuous tectonic motions.

Disasters↗
PubMed1983

Behavioral, attitudinal, and physiologic characteristics of smoking and nonsmoking asbestos-exposed shipyard workers.

The smoking characteristics of shipyard workers participating in an Asbestos Medical Surveillance Program (N = 3,991) were assessed. Sources of data were: (1) a self-assessment questionnaire on the smoking history and respiratory symptomatology of the 871 current smokers who participated in the smoking study, and (2) chest roentgenograms and pulmonary function test results and medical records for the entire population. The study population included 1,711 current smokers, 988 former smokers and 1,292 never smokers. The annual "quit rate" for former smokers had increased from less than 1% in 1961 to 4.2% in 1978. Of the 871 current smokers who participated in the smoking study, 19% had resumed smoking after having given up cigarettes for one year or longer. Men in the smoking study were reasonably well informed about the health consequences of smoking. While they perceived themselves to be susceptible to disease, and the disease to be serious, the benefits they saw in quitting were related more to economics and aesthetics than to health. When the results were age adjusted, no differences in rate of pulmonary function abnormalities and chest film abnormalities were found between current smokers who voluntarily participated in the smoking study and those who did not. All pulmonary function testing abnormality and chest film abnormality rates were significantly lower for former smokers and never smokers.

Adult↗
PubMed1982

Toy play, play tempo, and reaction to frustration in infants.

Measures of toy play including duration and tempo of play were obtained for a combined sample of 7 male and 5 female infants 22 to 26 mo. of age. Additional measures of reaction to frustration were obtained during a second session where toys were placed out of reach of the subjects. Measures of frustration included crying, squirm/escape attempts, and non-crying vocalizations. Several correlations between toy play and reaction to frustration were found and were indicative of a general relationship between response persistence during play and attempts to escape from the frustrating situation.

Attention↗
PubMed1981

Radiological diagnosis of primary greater omental mass lesions.

Gastrocolic separation may be due to many causes including greater omental masses. This feature was noted in two patients with sarcomatous lesions and one with a haematoma of the greater omentum. This feature was not obvious in a fourth patient, with an omental tuberculous abscess who had had a partial gastrectomy. However, angiographic features in all patients were pathognomonic of an omental mass, but not necessarily of the cause of the mass.

Angiography↗