Biomedical subjects

K Barry

Publications and source records attributed to K Barry.

34 records · Page 2Linked to original sources

PubMed1992

Gonococcal lipooligosaccharide sialylation prevents complement-dependent killing by immune sera.

Previous investigators have demonstrated that a sialic acid residue is added to the terminal galactose moiety of gonococcal lipooligosaccharide (LOS) when incubated with 5'-CMP-N-acetylneuraminic acid. When this in vitro sialylation occurs, gonococci become resistant to the bactericidal activity of normal human serum. This is believed to result because the added sialic acid residue blocks the binding of bactericidal anti-LOS antibodies present in normal human serum. We extend these studies by demonstrating that sialylated gonococci also become resistant to the bactericidal effect of immune sera containing antibodies that recognize exposed components of the outer membrane besides LOS. Prevention of antibody binding to the organism was not the cause, since the same percentage of bactericidal antibodies to the major outer membrane protein, Protein I, can be absorbed with sialylated organisms as with wild-type organisms. In addition, gonococcal sialylation prevents opsonophagocytosis by antigonococcal antisera. The negative effect of sialic acid on the complement pathway might be the reason for the findings in this study.

Antigens, Bacterial↗

PubMed1992

Leg lengthening by the transiliac method.

The transiliac method of leg lengthening uses a modification of Salter's innominate osteotomy. The bone graft increases the length of the hemipelvis distal to the sacro-iliac joint. Leg-length inequality in 23 patients was treated by this method with an average gain in length of 2.8 cm (2.0 to 3.5). Apart from one residual femoral nerve palsy there were no notable complications. The facility to redirect the acetabulum allowed by the technique, may be useful in cases of potential hip instability or acetabular dysplasia.

Adolescent↗

PubMed1992

The role of instrumental responses in memory retrieval in a T-maze.

Retrieval of the memory of non-reward on a rewarded trial was investigated here employing rats in a T-maze. A forced choice procedure was used. The daily rewarded (R) and non-rewarded (N) trials always occurred in a fixed order, two R, four N, and finally two R, i.e. the series was R1-R2-N1-N2-N3-N4-R3-R4. In an original acquisition phase. Trial N4 of the series having occurred in a particular spatial alternative, e.g. left, it was followed by R3 either in the same alternative, Groups C and T, or in the opposite alternative, Group R. Group T, unlike Groups C and R, received a relatively long intertrial interval between N4 and R3. In a shift phase, groups were treated as in original acquisition except that the long intertrial interval (Group T) and the change in response (Group R) now occurred between R3 and R4 rather than N4 and R3. The major finding in original acquisition was slower running by Groups T and R than by Group C on Trials N2, N3, and N4. In shift, differences between the groups disappeared. These findings are consistent with the hypothesis that response-produced cues contribute to memory retrieval.

Animals↗

PubMed1992

Duodenal rupture with avulsion of the bile duct: an unusual injury.

Blunt abdominal trauma may give rise to infrequent and unusual patterns of organ damage requiring prompt and complete exploratory laparotomy if the full extent of injury is to be recognised. We present a case of avulsion of the common bile duct in association with duodenal rupture to illustrate the importance of this strategy.

Abdominal Injuries↗

PubMed1990

[Ocular impression test with transfer for the surveillance of vitamin a level].

This study presents the first results of "impression cytology ocular test" in Mauritania for determination of vitamin A rate. This study is based on the community health centers and is not significative of general population. It's a question in this first study of testing this method, realized in some regions of Mauritania (Nouakchott, Dakhlet Nouadhibou, Hodh Gharby, Inchiri, Adrar, Tiris-Zemmour).

Child↗

PubMed1989

Informed consent, deception, and the use of disguised alcohol questionnaires.

In preparation for a physician intervention trial to determine the effectiveness of treatment of alcoholism in a primary care setting, a study was conducted to determine patient reaction to a masked alcohol screening questionnaire. The disguised questionnaire was developed to improve the accuracy of self-reported drinking behavior and facilitate blinded randomization to an intervention and control group. Patient reaction was determined by a face-to-face structured interview. The interview was structured to elicit responses before and after the patient was informed of the true nature of the questionnaire. The sample consisted of 21 alcoholic and 33 nonalcoholic patients in a primary care clinic. Seventy-five percent of the respondents were comfortable not being fully informed when research procedures involve the use of disguised alcohol questionnaires. There was some discomfort over the deceptive nature of the questionnaire, but 83% of the subjects believed the deception was justified and necessary. Males and alcoholics in the sample were more comfortable not being fully informed about research procedures suggesting greater trust in the medical profession. Females, on the other hand, were more concerned than males about how a family member would react to the disclosure of family health information. Alcoholics and persons with only a high school education felt the use of disguised questionnaires improved their accuracy significantly more often than nonalcoholics or individuals in the sample who attended graduate school.

Adult↗

PubMed1988

Complex dislocation of the metacarpo-phalangeal joint of the index finger: a comparison of the surgical approaches.

Complex dislocation of the index metacarpo-phalangeal joint almost always requires surgical intervention. Controversy exists as to the most suitable surgical approach to reduction: palmar or dorsal. We reviewed four cases and carried out dissections in eight cadaver hands to compare the surgical approaches. The interposed volar plate was found to be the most important obstacle to reduction. Both approaches were successful in obtaining reduction. The dorsal approach was simple and safe, but necessitated longitudinal division of the volar plate and may carry a theoretical risk of late instability. The palmar approach allows restoration of normal anatomy but the radial neurovascular bundle is always vulnerable.

Adolescent↗

PubMed1988

Protein redistribution diet restores motor function in patients with dopa-resistant "off" periods.

Sixteen parkinsonians with acquired drug-resistant "off" periods without dyskinesia were placed on a diet in which virtually all protein was concentrated in the evening meal. Restoration of sensitivity to levodopa resulted in 88%. Ten patients (62%) have continued to comply with the diet for 7 months (mean). Two patients were studied in detail. Immobility correlated with elevated plasma levels of large neutral amino acids (LNAA), normality with low LNAA.

Amino Acids↗

PubMed1987

Influence of dietary protein on motor fluctuations in Parkinson's disease.

On a nearly zero protein diet, 11 patients with Parkinson's disease with the "on-off" effect demonstrated great sensitivity to levodopa (L-dopa)-carbidopa and reduced fluctuations. Eight patients required a 41% reduction in total L-dopa dosage and discontinuation of all adjuvant therapy to reduce the preponderance of chorea. On a high-protein diet, all patients were immobilized by bradykinesia for most of the day. A low-protein dietary regimen during the daytime offers an important technique for the control of fluctuations in patients with Parkinson's disease who are receiving L-dopa-carbidopa.

Aged↗

PubMed1987

Physical analysis of the COR region: a cluster of six genes in Saccharomyces cerevisiae.

Six genes, CYC1, UTR1, UTR3, OSM1, tRNAGly, and RAD7, have been localized within an 8-kilobase region on chromosome X of the yeast Saccharomyces cerevisiae. The physical structures and the transcripts of these genes were identified by analyzing a normal strain and six deletion mutants by genomic blotting, transcriptional analysis, and gene disruption procedures. The well-studied CYC1 gene encodes iso-1-cytochrome c; the tRNAGly gene encodes a tRNA; deletion of OSM1 and RAD7 causes sensitivity to hypertonic medium and UV irradiation, respectively. There were no observable phenotypes in strains having deletions of the UTR1, UTR3, and tRNAGly gene. The high density of transcripts, with little or almost no intragenic regions, indicates that the chromosomal organization of S. cerevisiae resembles the chromosomal organization of procaryotes rather than higher eucaryotes.

Chromosome Mapping↗

PubMed1985