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Biomedical subjects

J A Gibson

Publications and source records attributed to J A Gibson.

At least 37 records · Page 2Linked to original sources
PubMed1990

Behavioral correlates of maternal depressive symptomatology in conduct-disorder children: II. Systemic effects involving fathers and siblings.

This study tested a systemic hypothesis of the relation between maternal depressive symptomatology and the behavior of conduct-disordered children (n = 47) toward their mothers, fathers, and siblings. Maternal symptomatology interacted with the children's behavior toward all family members. Children whose mothers were distressed tended to be more compliant and less aversive toward them than toward their fathers, and the opposite applied to children whose mothers were not distressed. Comparable results were obtained in comparisons of child interactions with mothers and siblings, although in the latter case the children's behaviors differed in absolute magnitude as a function of their interaction partner.

Adolescent↗
PubMed1989

Relationship between radiological classification and the serological and haematological features of untreated pulmonary tuberculosis in Indonesia.

Immunological and metabolic responses were studied in 110 patients with newly diagnosed pulmonary tuberculosis and 32 healthy controls from similar socioeconomic backgrounds. The severity of lung involvement was assessed radiologically, but this was not related to the current features of cell mediated immunity or to those of many aspects of the serological response to Mycobacterium tuberculosis. However, the patients with more extensive pulmonary tuberculosis showed higher titres of IgG2 antibody to whole killed M. tuberculosis and to the ML34 epitope shared by many species of mycobacteria. The patients with more extensive pulmonary tuberculosis showed a more marked metabolic response to infection as manifested by changes in serum levels of acute phase reactant proteins. Accordingly, the metabolic responses are considered to be more likely to prove of value in clinical monitoring of patients for severity of infection, or of reactivation of infection with M. tuberculosis, than immunological responses.

Acute-Phase Proteins↗
PubMed1989

Behavioral correlates of maternal depressive symptomatology in conduct-disorder children.

We contrasted two predictive models of the impact of maternal depressive symptomatology on child behavior in a study of 51 mothers and their conduct-disorder children. Relations between global measures of maternal distress and child adjustment and observational measures of mother-child interaction were examined. Children of distressed mothers were more maladjusted than children of nondistressed mothers, when maladjustment was measured on the basis of a global rating, but "better" adjusted when measured on the basis of interactional measures. Measures of maternal indiscriminate responding to the child may account for these findings. Results suggest that (a) although conduct-disorder children are generally more maladjusted when their mothers are distressed, they display this maladjustment in a selective fashion, and (b) maternal distress acts as an adverse contextual factor that maintains mother-child interactional difficulties by disrupting the attentional and monitoring skills required for contingent responding.

Adult↗
PubMed1989

Adaptive resistance to aminoglycoside antibiotics in Pseudomonas aeruginosa.

Aminoglycoside-resistant variants of Pseudomonas aeruginosa strain PAO1 were readily selected by culturing the organism in medium containing increasing concentrations of gentamicin, tobramycin or amikacin until the strains were growing in a concentration of drug 128-fold greater than the minimal inhibitory concentration for the sensitive parent strain. These resistant strains exhibited characteristics previously associated with the impermeability type of resistance mechanism, i.e., they grew more slowly than the parent strain, the resistance was unstable in the absence of the antibiotic, and adaptation to one of the antibiotics conferred cross-resistance to other aminoglycosides. The adapted strains grew, with minimal morphological alterations, in concentrations of the various aminoglycosides that normally produced cell envelope damage, misshapen and filamentous cell formation, and cell lysis in the sensitive strain. Neither protein H1 nor phospholipid alterations appear to play a significant role in adaptive resistance to aminoglycoside antibiotics in this model system. The acquisition of adaptive resistance to the aminoglycoside antibiotics did not confer resistance to polymyxin B, another cationic antibiotic which is thought to share binding sites within the outer membrane with the aminoglycosides.

Adaptation, Physiological↗
PubMed1989

Home intravenous antibiotic therapy using a programmable infusion pump.

Several publications have demonstrated the efficacy, safety, and cost-effectiveness of home intravenous antibiotic therapy. The development of a computerized ambulatory infusion drug delivery pump has enabled us to treat patients previously considered ineligible for home intravenous antibiotic therapy. Seventeen patients were treated at home with the infusion pump for a range of 6 to 49 days. Selection of the infusion pump was made for a variety of reasons: the need for frequent intravenous drug administration (9 patients); impaired manual dexterity (5 patients) or cognitive function (3 patients); unwillingness to learn the necessary techniques (3 patients); and lack of support persons at home (3 patients). Of the 17 patients, 15 could not have been discharged from hospital to home without the use of the pump or a similar device.

Adolescent↗
PubMed1988

A review of boron neutron capture therapy (BNCT) and the design and dosimetry of a high-intensity, 24 keV, neutron beam for BNCT research.

This paper reviews the development of boron neutron capture therapy (BNCT) and describes the design and dosimetry of an intermediate energy neutron beam, developed at the Harwell Laboratory, principally for BNCT research. Boron neutron capture therapy is a technique for the treatment of gliomas (a fatal form of brain tumour). The technique involves preferentially attaching 10B atoms to tumour cells and irradiating them with thermal neutrons. The thermal neutron capture products of 10B are short range and highly damaging, so they kill the tumour cells, but healthy tissue is relatively undamaged. Early trials required extensive neurosurgery to exposure the tumour to the thermal neutrons used and were unsuccessful. It is thought that intermediate-energy neutrons will overcome many of the problems encountered in the early trials, because they have greater penetration prior to thermalization, so that surgery will not be required. An intermediate-energy neutron beam has been developed at the Harwell Laboratory for research into BNCT. Neutrons from the core of a high-flux nuclear reactor are filtered with a combination of iron, aluminium and sulphur. Dosimetry measurements have been made to determine the neutron and gamma-ray characteristics of this beam, and to monitor them throughout the four cycles used for BNCT research. The beam is of high intensity (approximately 2 x 10(7) neutrons cm-2 s-1, equivalent to a neutron kerma rate in water of 205 mGy h-1) and nearly monoenergetic (93% of the neutrons have energies approximately 24 keV, corresponding to 79% of the neutron kerma rate).

Boron↗
PubMed1987

Specific antibody in the subclasses of immunoglobulin G in patients with smear-positive pulmonary tuberculosis.

Discrimination between patients with smear-positive pulmonary tuberculosis and healthy adults achieved by the assay of serum anti-mycobacterial antibodies in the major immunoglobulin class (IgG) was greatly improved by assay of antibodies in its four subclasses. By the former method, only 55 of 107 (51%) patients had antibody levels above the upper limit of 31 control sera, but 96 (90%) patients had levels above the upper control level in one or more of the IgG subclasses. Antibody levels in the IgA and IgM classes were less discriminative, but four patients with no elevated levels in the IgG subclasses had elevated IgA antibody levels, bringing the total of patients with significant serological changes compatible with tuberculosis to 100 (93.5%).

Antibodies, Bacterial↗
PubMed1986

Strain to strain variation in the immunogenicity of BCG.

BCG strains differ in their ability to elicit immune reactions in mice manifesting as increases in foot pad thickness following challenges with BCG ultrasonicate antigen at different times after vaccination. When we know more about the relevance to protection of these three reactions, such timed skin testing may prove of value for determining the efficacy of BCG in man.

Animals↗
PubMed1984

Ranitidine: prophylaxis of duodenal ulcer recurrence.

Ninety-two patients with healed duodenal ulcer received prophylactic treatment with ranitidine, 150 mg at night, to prevent relapse. Patients were reviewed at 4-monthly intervals for clinical assessment and endoscopy. Eighty-two patients completed the trial. After one year sixty-two patients (76%) were in endoscopic remission; ten patients (12%) suffered symptomatic relapse and ten others had asymptomatic ulcers during treatment. There were no clinically significant untoward effects associated with the drug. A single nocturnal dose of 150 mg ranitidine reduces the relapse rate after duodenal ulcer healing.

Adult↗
PubMed1983

Chlamydial genital infection in prostitutes in Iran.

The prevalence of chlamydial genital infection was studied in 177 prostitutes in Iran; 100 in Teheran and 77 in the port of Bandar Abbas. Chlamydia trachomatis was isolated in eight (6.9%) of 116 patients with valid cultures. Type-specific antibodies were found against C trachomatis serotypes D to K (genital serotypes) in 94.2% and against serotypes A to C (trachoma serotypes) in 2% of the prostitutes. Type-specific IgM at a titre of greater than or equal to 8, indicating current infection, was found in 29.2%, whereas type-specific IgG at a titre greater than or equal to 64, suggesting a current or recent infection, was present in 71.5%. The lower chlamydial isolation rate in these women may have been due to previous treatment with antichlamydial drugs and because of immune responses resulting from repeated reinfection with chlamydiae. The results indicate that in Iran prostitutes are commonly infected with C trachomatis and are probably a major reservoir of chlamydial genital infection.

Adolescent↗