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Biomedical subjects

K Kelley

Publications and source records attributed to K Kelley.

72 records · Page 4Linked to original sources
PubMed1986

Repeated exposure to sexually explicit stimuli: novelty, sex, and sexual attitudes.

The effects of a new stimulus following repeated exposure to a familiar, sexually explicit stimulus were studied. Female and male subjects (N = 56) viewed an explicitly heterosexual film daily for 4 days and then were exposed to either a film showing the same actors engaging in different sexual acts or one with different actors engaging in the same activities shown in the original film. Analyses of self-rated responses showed that negative affect significantly increased with film repetition and returned to original levels with the introduction of novelty. Erotophobia was associated with negative affect. Results for self-reported sexual arousal and concern ratings revealed sex differences, with males becoming more aroused and concerned by novelty consisting of different actors, and females becoming more aroused and concerned by the same actors performing different acts. Affective and cognitive theories of human sexual responding provided possible explanations for these results.

Affect↗
PubMed1986

Can the Sickness Impact Profile measure change? An example of scale assessment.

The Sickness Impact Profile is a well known measure of functional status which has been validated as a measure of differences in function between patients, but not as a measure of within-patient change. To evaluate its performance as a measure of change, the Sickness Impact Profile was compared to a transition index that directly assesses intra-patient differences in maximal physical and emotional function. With the index, patients rate themselves as much better, slightly better, the same, slightly worse or much worse as compared to a previous assessment. When compared to the corresponding index ratings, Sickness Impact Profile subscale score changes for a rating of worse were of greater magnitude than those for a rating of better. The inherent variability of the Sickness Impact Profile score was estimated using the standard deviation of the score change for the index rating "the same". For patients to be regarded as changed they had to lie outside the probability limits of this score change. Defined in this way, only patients who stated they were worse on the index were detected. Receiver operator characteristic curves were constructed and also demonstrated that deteriorations in function were more accurately detected. Using different score cutoffs, the best true positive rate (71%) was obtained using a one point change on the psychosocial subscale. This was accompanied by a 39% false positive rate. No score value appeared sufficiently accurate to be useful. Its apparent inability to detect improvements and deteriorations equally, and the wide standard deviations for a given change in function, may limit the use of the Sickness Impact Profile for following individuals over time.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1986

Radiographic comparison of cementing techniques in total hip arthroplasty.

Using a single prosthetic design, the authors conducted a radiographic comparison of the results of changes in cementing techniques in 58 total hip arthroplasties with respect to the initial postoperative and equivalent follow-up radiographs. The study period, 1975-1982, spanned the advent of cement restrictors, canal preparation, and pressurization techniques. In matched patients, the use of modern cementing techniques and canal preparation led to a significant improvement in the initial postoperative radiographic appearance and subsequent loosening rate of the femoral component, suggesting that these techniques may change the expected rate of late femoral component loosening, based on previous studies done with prepressurization cementing techniques.

Aged↗
PubMed1986

A patient-specific measure of change in maximal function.

We designed a short, patient-specific index that measures changes in maximal physical, mental, and emotional function. A baseline component, given at the initial interview, documents the patients' usual activities that require the most physical exertion and mental effort, as well as the patients' ability to cope with stress. A transition component assesses the subsequent change from these patient-specific norms. The index was evaluated in two separate studies involving medical and surgical patients. In the first study, the index was administered twice to 40 patients. Reliability was excellent for all three aspects of function. The transition index had a high degree of internal consistency. In a second study of 43 hospitalized patients, the validity of the index was assessed by comparing its performance with the Sickness Impact Profile; high correlations were found. In addition, the overall patterns of change differed in the expected directions in the medical and surgical groups. This index is unique in its ability to measure change directly, is interpretable in individual patients, and could be easily applied in clinical practice and research.

Activities of Daily Living↗
PubMed1985

Regional myocardial function is not affected by severe coronary depressurization provided coronary blood flow is maintained.

It has been suggested that vasodilation distal to a stenosis may cause a profound decrease in perfusion pressure and adversely affect regional left ventricular function. This phenomenon could explain the clinical concept of reversal of regional dysfunction by coronary revascularization. To evaluate the hypothesis that regional myocardial function parallels regional coronary blood pressure in the absence of changes in coronary flow, dogs chronically instrumented with left circumflex coronary artery flow probes, cuff occluders, pressure catheters and segmental function sonomicrometers were studied. By decreasing regional coronary vascular resistance with selective intracoronary dipyridamole and controlling blood flow with a proximal coronary cuff occluder, the mean left circumflex artery pressure was reduced from 83 +/- 3 to 38 +/- 2 mm Hg while circumflex coronary blood flow was maintained constant. Regional contractile function as measured by circumflex sonomicrometers was unchanged at constant circumflex subendocardial blood flow as measured by radioactive microspheres. These findings suggest that regional contractile function is dependent on subendocardial blood flow and is independent of coronary perfusion pressure.

Animals↗
PubMed1984

Influence of N-acetylhomocysteine thiolactone on cultured retinal cells in canine neuronal lipofuscinosis. An ultrastructural study.

An SH- group donor drug, N-acetylhomocysteine thiolactone (0.2 mg/ml), was added to retinal cultures from an adult dog affected with ceroid lipofuscinosis (NCL). This substance was applied every 3rd day to the culture medium. After 1, 2 and 3 weeks in culture the cells were fixed for electron microscopy. Ultrastructurally the NCL-specific lipopigments revealed extensive fading out or vacuolation, revealing randomly arranged lamellar or 'fingerprint' membranes as well as structures resembling degenerated mitochondria. Additionally extensive fragmentation of the pigment bodies was present. The significance of these results are discussed.

Animals↗
PubMed1983

Choice of substrate in determining peroxidase activity in the amniotic fluid.

Peroxidase activity in the amniotic fluid has been measured with two different chromogens, O-dianisidine and p-phenylenediamine. No activity was demonstrable with the former substrate but was present with the latter. These results show that choice of substrate is important in determining peroxidase activity, especially in the amniotic fluid.

Amniotic Fluid↗
PubMed1983

In vivo demethylation of chicken embryonic beta-type globin genes with 5-azacytidine.

We have studied the in vivo effects of the methyl-blocking cytotoxic pyrimidine analog 5-azacytidine upon DNA methylation and expression of the normally inactive embryonic beta-type globin genes in adult chickens. We find that 5 daily treatments with intravenous 5-azacytidine is capable of converting the normally completely methylated embryonic rho gene to a greater than 75% demethylated state as assayed by the restriction endonucleases HpaII, MspI, and HhaI. However, this change in methylation is not accompanied by activation of the embryonic rho gene at the level of globin protein or globin RNA. Although our analysis does not exclude a few copies of embryonic globin RNA per cell, this result is still in contrast with the results seen with the fetal gamma-globin genes in baboons and humans [17; see also other chapters in this volume]. Hence demethylation by 5-azacytidine treatment alone is not sufficient to activate the chicken embryonic beta-globin genes. We propose that these seemingly disparate results can be reconciled by a model in which certain genes in specific cell types (eg, human and baboon gamma-globin in adult erythroid cells, chicken ev-1 in MSB cells, mouse metallothionein-1 in lymphoblastoid cells) are in a poised state such that removal of specific methyl cytosines results in a high level of transcription. In contrast other genes (including chicken rho and epsilon embryonic globin genes in adult erythroid cells) are in a suppressed state that overrides activation by demethylation. Alternatively, 5-azacytidine could activate certain genes by a mechanism totally independent of DNA methylation. For instance, selection of specific early erythroid cell types could account for the results seen in baboon fetal globin gene activation. The availability of various eukaryotic DNA transformation systems, characterization of eukaryotic DNA methylases, and development of large-scale cultures of erythropoietic precursor cells should facilitate detailed examination of these various states of gene activation and allow the elucidation of the precise role of DNA methylation in the regulation of globin gene switching.

Animals↗
PubMed1979

Autoimmune implications of immune complexes in clinical variants of hepatitis B.

Immune complexes (IC) were investigated in sera from 208 individuals with various clinical types of viral hepatitis diagnosed by clinical and laboratory criteria, including liver biopsy. Immune complexes were assessed by platelet aggregation (PI A) and by radioimmunoassay (RIA). The data were related to autoimmune phenomena (especially rheumatoid factors) and to the role that the IgM class of hepatitis B (HB) antibody might have in IC formation. Although the highest frequency of P1 A was in the few sera from patients with cirrhosis or hepatoma, the next highest was in sera from acute hepatitis patients (71%), and the lowest in sera from chronic active (57%) and chronic persistent (46%) hepatitis patients. A proportional number of patients with IC's were positive for hepatitis B surface antigen (HBs). A parallel prevalence was noted between P1 A and autoantibodies, with anti-Ig's being found more frequently in sera from acute hepatitis and chronic active hepatitis patients. The relationship between RIA results for complexes and RIA results for anti-IgG was inverse, as though anti-IgG interfered with IC reactivity by RIA. Anti-IgM pre-incubated with sera increased the amount of P1 A in sera from patients with acute hepatitis as well as in those from patients with chronic persistent hepatitis, suggesting a more frequent IgM involvement in IC's in these diseases than in chronic active hepatitis. Whereas liver cell damage in acute and active hepatitis may reflect elevated autoantibodies, the IgM class of HBs antibody may be involved in acute as well as chronic persistent hepatitis.

Antigen-Antibody Complex↗
PubMedDate not supplied

Isolation of a gastrin releasing peptide receptor from normal rat pancreas.

The presence of a putative GRP receptor on rat pancreatic particulate membranes was demonstrated by covalent cross-linking to 125I-gastrin releasing peptide (GRP), which revealed a radioactive band with Mr = 80-90 kDa on reduced SDS-PAGE. Fresh rat pancreatic membranes contained a GRP receptor which was solubilized with Triton X-100 as assessed by its failure to sediment at 100,000 x g for one hour and its ability to pass through a 0.22 mu filter. When 125I-GRP binding was studied using Sephadex G50 gel filtration chromatography to separate bound from unbound ligand, substantial amounts of 125I-GRP binding were observed in rat crude solubilized pancreatic membranes, but essentially no specific binding was observed until the crude solubilized membranes were fractionated by ammonium sulfate precipitation. Specific 125I-GRP binding was 500, 700 and 1400 fmol/mg protein, respectively, in the 0-25%, 25-50% and 50-80% saturated ammonium sulfate fractions (125I-GRP concentration = 1 nM). Specific binding was temperature dependent, saturable and of high affinity, (KD = 2.3 nM). A unique 70 kDa band was visualized by silver staining of the SDS-PAGE of eluates of GRP(14-27) affinity gel compared with eluates of control affinity gels incubated with the 25-50% (NH4)2SO4 fraction. The lower Mr than that observed with covalent cross-linking may represent the binding subunit of a larger receptor protein. This ligand-affinity isolated protein is thus a good candidate for the GRP receptor, or the binding subunit of it, from normal rat pancreas.

Ammonium Sulfate↗