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Biomedical subjects

J M Saunders

Publications and source records attributed to J M Saunders.

At least 37 records · Page 2Linked to original sources

An immunohistological evaluation of Pseudomonas aeruginosa pulmonary infection in two patients with cystic fibrosis.

Pseudomonas aeruginosa is the principal pulmonary pathogen in patients with cystic fibrosis. All attempts to date to prevent or eradicate P. aeruginosa infections in these patients have been unsuccessful. Vaccination against P. aeruginosa has been proposed as a preventive strategy but it has not been adequately evaluated. The purpose of this study was to determine whether P. aeruginosa, present in the lungs of patients with cystic fibrosis, express surface antigens similar to those grown in vitro; this issue is of critical importance when choosing bacterial products as vaccine candidates. Lung sections from two patients who died of the pulmonary complications of cystic fibrosis were studied. Bacteria, both in lung sections and isolated from the lung sections and grown in vitro, reacted strongly with polyclonal and monoclonal antibodies against P. aeruginosa mucoid exopolysaccharide and outer membrane proteins F and H2; this suggested that these antigens are surface exposed in vivo. It was also found that bacteria in both lung sections were associated in situ with IgG, IgA, and C3 but not with IgM or C4.

Antibodies, Bacterial↗

Immunoblot analysis of antigens associated with Haemophilus ducreyi using serum from immunised rabbits.

Sodium dodecyl sulphate polyacrylamide gel electrophoresis and immunoblotting were used to characterise isolates of Haemophilus ducreyi. Isolates of H ducreyi were heterogeneous in protein composition, but isolates from single outbreaks appeared similar both in protein profiles and antigenic analysis. Rabbits immunised with H ducreyi responded with a vigorous humoral immune response in which multiple antigenic polypeptides were detected. The most prominent antigens had molecular masses of 67, 42, 22.5, and 20 kilodaltons.

Animals↗

Humoral response of the mouse to Treponema pallidum.

To investigate the development of the humoral immune response of mice to infection with Treponema pallidum, Balb/c and C57Bl mice were injected intradermally with 10 x 10(6) virulent organisms. Serum samples were taken from the mice at weekly intervals after infection and used in the electrophoretic transblotting technique to detect T pallidum and T phagedenis biotype Reiter antigens. The serum samples taken from infected mice at 21, 42, 84, and 126 days after infection recognised two to 15 T pallidum antigens, with a gradual but continual increase in the number of antigens recognised. The same antisera to T pallidum recognised five cross reactive T phagedenis biotype Reiter antigens. Mice injected with 10 x 10(6) heat killed T pallidum organisms failed to recognise T pallidum antigens, as shown by the blotting technique. When mice infected with T pallidum were given antibiotics, the development of the humoral response was interrupted. These experiments indicated that mice respond more slowly than rabbits to T pallidum, which may be because T pallidum is weakly immunogenic in mice.

Animals↗

Models of care for persons with progressive cancer.

A need exists for a living-dying model that encompasses hospice care and alternative programs of care for the terminally ill. The existing medical and rehabilitative models are focused in directions that do not allow implementation of continuity of care directed toward supporting patients during the plateaus of their illnesses. Today, society has evolved to value the patient as a consumer of health care who can participate through making informed choices among the rich alternatives of care available. Yet the knowledge and technology base of health care delivery today increases at such a rapid rate that it almost seems out of control. This paradox makes it difficult for the patient-consumer to have access to information necessary for involvement in informed decision making. Greater numbers of consumers of health care are active in assuming responsibility for maintaining wellness. At the same time, they are seeking health care programs outside the medical model, as well as within the medical model. The "high-tech" atmosphere has been tempered with an emphasis on humanism, perhaps as a response to the infusion of machinery into our lives. As health care costs have escalated, concern has mounted that health care costs be contained, and that the poor and the elderly not be further curtailed in access to health care resources. There is tremendous potential among nurses for leadership in the creation of services that support quality of life for cancer patients and families. Nurses, as a collective, must be willing to engage in the politics of negotiation for reallocation of health care resources toward person-centered services and to establish a power base for influencing these decisions at the local, state, and national level of government and within various organizations offering health care services. As person-centered services are established, nurses must also move toward formalizing emergent practices into standards of care. Consumers deserve the protection of practice standards that are developed and sanctioned by the profession. It is also critical to test practice, both as it emerges, and after it has been formalized into standards. Nurses must continue to question the tenets of their practice. For example, what are the outcome effects of monitoring and supporting patients during the chronic phase of the living-dying interval? Is either the severity or the number of problems in the terminal phase reduced by these interventions? Changes in the provision of health services in this past decade have been extensive and broadly based.(ABSTRACT TRUNCATED AT 400 WORDS)

Attitude to Death↗

Evaluation of the inbred mouse as a model for experimental Treponema pallidum infection.

Mice of several inbred strains were studied for responses to Treponema pallidum (Nichols). Mice were injected with viable treponemes and observed daily for the presence of lesions or signs of illness. Although none of the mice developed detectable lesions, they did develop specific anti-T. pallidum antibodies that were observed as early as 21 days after inoculation with viable T. pallidum. The antibodies were detected by an enzyme-linked immunosorbent assay and by passive haemagglutination.

Animals↗

Development of monoclonal antibodies that recognize Treponema pallidum.

We developed a panel of monoclonal antibodies to Treponema pallidum (Nichols) antigens, some of which recognize treponemal antigens on T. pallidum (Nichols), T. pallidum strain 14, and Treponema phagedenis biotype Reiter. The antibodies were detected by either an enzyme-linked immunosorbent assay or a radioimmunoassay.

Animals↗

Neuraminidase-activated attachment of Actinomyces naeslundii ATCC 12104 to human buccal epithelial cells.

The attachment of Actinomyces naeslundii ATCC 12104 to human buccal epithelial cells pre-treated with neuraminidase (sialidase) was evaluated. Both commercial clostridial neuraminidase and neuraminidase preparations from the test strain of A. naeslundii enhanced attachment. The results suggest that the A. naeslundii beta-galactoside-seeking ligand involved in hemagglutination and interbacterial coaggregation also mediates one type of binding to human buccal epithelial cells.

Actinomyces↗

Sodium citrate: an alternative antacid for prophylaxis against aspiration pneumonitis.

In a double-blind study, 107 patients undergoing elective and emergency surgical procedures were given 15 ml of either sodium citrate 0.3 M or placebo 10 minutes before induction of anaesthesia. Gastric contents were sampled immediately after induction and the pH was measured. The mean pH of the Gastric contents of patients given sodium citrate was 5.67, whereas for those given the placebo it was 3.21 (p less than 0.001). Of patients given sodium citrate 92% had a gastric pH above 3.0 compared with only 37% in the placebo group (p less than 0.001). At the end of surgery gastric contents were emptied as completely as possible and the volume and pH measured. There was no significant difference in the mean volume of gastric contents in the two groups. In neither group was the mean pH at the end of surgery significantly different from that after induction.

Adolescent↗

Attachment of Actinomyces naeslundii to human buccal epithelial cells.

A standardized assay was used to measure the attachment of Actinomyces naeslundii ATCC 12104 to washed human buccal epithelial cells. Treatment of the A. naeslundii cells with hyaluronidases, wheat germ lipase, protease, trypsin, heat, or sonic oscillation significantly reduced their ability to attach to epithelial cells. Treatment of the epithelial cells with the above enzymes did not influence the attachment of A. naeslundii. Extraction of A. naeslundii with NaOH also significantly reduced the ability of the bacterium to attach to human buccal epithelial cells. The neutralized and dialyzed NaOH extract contained both carbohydrate and protein substances in a ratio of about 1:1. Adding this extract back to the extracted bacterial cells partially restored their ability to attach to epithelial cells. When the NaOH extract was preincubated with epithelial cells and residual extract was removed by washing, attachment of normal A. naeslundii was partially blocked. The ability of the extracted material to block attachment was significantly reduced when treated with hyaluronidases or with wheat germ lipase. Treatment with heat, protease, or trypsin did not significantly reduce the ability of the extracted materials to block attachment. Pretreatment of the epithelial cells with hyaluronic acid or chondroitin sulfate also reduced subsequent attachment of normal A. naeslundii cells. Pretreatment of epithelial cells with dextrans, proteins, or unpure mannose did not influence subsequent attachment of A. naeslundii. Pretreatment of A. naeslundii with galactose and lactose significantly inhibited attachment to normal epithelial cells. The results suggest that the attachment of A. naeslundii to human buccal epithelial cells may involve mucopolysaccharides similar to hyaluronic acid on the surface of the bacterial cells. Other attachment mechanisms may also be operative.

Actinomyces↗

A versatile antipollution device.

Removal of anaesthetic pollutants from the operating theatre environment requires the use of relatively sophisticated equipment which must be added to an existing life support system (the anaesthetic machine). The interface is only one part of this system and to be safe and satisfactory it must be as simple and versatile as possible and be designed in such a way as to render incorrect connection and use virtually impossible.

Air Pollutants↗