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Biomedical subjects

J Nimmo

Publications and source records attributed to J Nimmo.

At least 19 recordsLinked to original sources
PubMed2003

Sasa-Satsuma higher-order nonlinear Schrödinger equation and its bilinearization and multisoliton solutions.

Higher-order and multicomponent generalizations of the nonlinear Schrödinger equation are important in various applications, e.g., in optics. One of these equations, the integrable Sasa-Satsuma equation, has particularly interesting soliton solutions. Unfortunately, the construction of multisoliton solutions to this equation presents difficulties due to its complicated bilinearization. We discuss briefly some previous attempts and then give the correct bilinearization based on the interpretation of the Sasa-Satsuma equation as a reduction of the three-component Kadomtsev-Petviashvili hierarchy. In the process, we also get bilinearizations and multisoliton formulas for a two-component generalization of the Sasa-Satsuma equation (the Yajima-Oikawa-Tasgal-Potasek model), and for a (2+1)-dimensional generalization.

Journal Article↗
PubMed2001

From river to ridge: a blueprint for sustainable management in the Georges River catchment.

Research on sustainable transport and water projects, conducted in North America during 1999, identified four key considerations common to a number of projects. These four considerations are the preconditions necessary to achieve sustainability in a given location. These preconditions (BAPP) are boundary definition, administrative alignment, protection of non-urban lands, and the participation of all interested parties. This paper considers the perceived attitudes of various catchment stakeholders and focuses on planners and planning. The results of questionnaire surveys based on BAPP concepts suggest that local government is perceived as having the highest priority for protection of riparian lands and waterways (as individual Councils and Regional Organisations of Councils). Thus local government is the preferred arena for coordination, responsibility and jurisdiction of waterways and riparian land. The opportunity exists to examine the differing roles of local and state government. The paper concludes by outlining the implications of this research for land use planning and institutional structures in sustainable river management.

Agriculture↗
PubMed1993

Expression of CD45 isoforms in chronic B-cell leukaemias.

CD45 isoform expression was studied in 204 cases of B-cell lymphoproliferative disease, including 162 chronic lymphocytic leukaemia (CLL). In almost half the samples tested, CD45R0 was co-expressed with CD45RA, unlike normal B-cells, which express only CD45RA, except at terminal stages of differentiation. In a small number of cases CD45R0 was the dominant isoform expressed. No correlation could be discerned either with Binet or RAI staging in CLL or with disease type CLL, prolymphocytic leukaemia (PLL) or hairy cell leukaemia (HCL). Comparison of CD45 isoform expression with other markers showed no correlation with apparent maturational status of the cells involved.

Antigens, CD↗
PubMed1973

Pharmacological modification of gastric emptying: effects of propantheline and metoclopromide on paracetamol absorption.

The rate of paracetamol absorption depends on the rate of gastric emptying. Propantheline delayed gastric emptying and markedly slowed the absorption of paracetamol in six convalescent hospital patients. Conversely, the absorption of paracetamol in five healthy volunteers was accelerated by metoclopramide, a drug which stimulates gastric emptying. The total 24-hour urinary excretion of paracetamol was not influenced by propantheline or metoclopramide. Other similar absorption interactions probably occur since drugs are poorly absorbed from the stomach and many therapeutic agents influence gastrointestinal motility.

Acetaminophen↗
PubMed1973

The dependence of paracetamol absorption on the rate of gastric emptying.

1. The rate of gastric emptying was measured directly in 14 convalescent hospital patients and paracetamol absorption was studied following an oral dose of 1.5 g.2. Rapid gastric emptying was associated with the early appearance of high peak plasma paracetamol concentrations whereas peak concentrations were low and occurred late when gastric emptying was slow.3. There was a significant correlation between the rate of gastric emptying and the 0-4 and 0-24 h urinary excretion of paracetamol and its metabolites.4. In five patients with abnormally slow gastric emptying the mean maximum plasma concentration and 0-4 and 0-24 h urinary excretion of paracetamol were significantly lower than in seven patients with normal gastric emptying rates while the time taken to reach maximum plasma concentrations was longer.5. Individual differences in the rate of gastric emptying may contribute to variable absorption of many drugs.

Acetaminophen↗