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Biomedical subjects

R Sherlock

Publications and source records attributed to R Sherlock.

16 recordsLinked to original sources
PubMed2004

Cell interactions with laser-modified polymer surfaces.

The performance of a polymeric biomaterial depends on the bulk and surface properties. Often, however, the suitability of the surface properties is compromised in favour of the bulk properties. Altering the surface properties of these materials will have a profound effect on how cells and proteins interact with them. Here, we have used an excimer laser to modify the surface wettability of nylon 12. The surface treatment is rapid, cost-effective and can cause reproducible changes in the surface structure of the polymers. Polymers were treated with short wavelength ( < 200 nm) UV light. These wavelengths have sufficient photon energy (6.4eV) to cause bond scission at the material surface. This results in a surface reorganisation with incorporation of oxygen. Surface wettability changes were confirmed using contact angle measurements. Cell interactions with the surfaces were examined using 3T3 fibroblast and HUVEC cells. Cells morphology was examined using a confocal laser scanning microscope (CLSM). Cell activity and cell number on the treated nylon were assessed using biochemical assays for up to seven days. Both fibroblasts and endothelial cells initially proliferated better on treated compared with untreated samples. However, over seven days activity decreased for both cell types on the control samples and endothelial cell activity and cell number also decreased on the treated polymer.

3T3 Cells↗
PubMed2001

How an audit of epidural patients in a community hospital setting resulted in the development of a formal acute pain management service.

PURPOSE: To describe the results of an audit of patients who received epidural analgesics postoperatively and the subsequent development of a formal acute pain management service in a community hospital. METHODS: To understand how epidural analgesia was being used to treat postoperative pain at the Peterborough Regional Health Centre, Peterborough, Ontario, a retrospective chart review was performed. Audits were performed on 178 patients who had received epidural analgesia postoperatively from October 1994 to May 1995. Data pertaining to demographics, epidural analgesia, pain scores and side effects were collected. RESULTS: Sixty-one per cent of patients received bupivacaine/ fentanyl infusions, and 39% received epidural morphine boluses. More than 60% of patients reported no pain postoperatively. Patients who received bupivacaine/fentanyl were more likely than those who received epidural morphine to also receive co-analgesia and transitional analgesia. Patients who received epidural morphine were more likely than those who received bupivacaine fentanyl to experience respiratory depression, hypotension and pruritus. Patients were followed by the anesthesiologist who provided the anesthetic. Anesthesiologists practised independently, and formal policies and procedures did not exist. CONCLUSIONS: As a result of the audit, an acute pain management service was developed. This included a team that did daily rounds and consisted of a nurse clinician and an anesthesiologist who was assigned to the service on a weekly basis. A committee was created, and formalized policies and procedures were established. Standardized order sheets, data sheets and a computerized database were developed. Reports for administrative and quality improvement purposes were generated monthly. Education programs were developed. Co-analgesia and transitional analgesia are now part of routine care, and epidural catheter placement close to the site of incision is encouraged. A postoperative nausea and vomiting algorithm, and a treatment regimen for pruritus have also been implemented.

Adult↗
PubMed2000

Ethical issues in transgenics.

The arguments of critics and concerns of the public on generating transgenic cloned animals are analyzed for the absence or presence of logical structure. Critics' arguments are symbolically compared with "genetic trespassing," "genetic speeding," or "going the wrong way," and responses are provided to these arguments. Scientists will be empowered to participate in the public discussion and to engage the critics on these issues as they consider thoughtful, plausible responses to their concerns. Temporary moratoriums are recognized as a plausible approach to dealing with possible concerns of new scientific advancements.

Animal Welfare↗
PubMed1999

Novel reverse-turn mimics inhibit farnesyl transferase.

Reverse-turn inducing bicyclic lactams were incorporated into the substrate sequence recognized by farnesyl transferase to create inhibitors of RAS farnesylation. While the free peptides did not show any effect on the farnesylation, their Fmoc-protected counterparts impede the transformation of RAS with IC50's in the low micromolar range.

Alkyl and Aryl Transferases↗
PubMed1999

Molecular forceps from combinatorial libraries prevent the farnesylation of Ras by binding to its carboxyl terminus.

INTRODUCTION: Ras is one of the major oncogenes. In order to function properly it has to undergo post-translational processing at its carboxyl terminus. It has been shown that inhibitors of farnesyl transferase, the first enzyme in the processing chain, can suppress the transforming activity of oncogenic Ras. RESULTS: We have identified molecular forceps, branched peptidic molecules, from combinatorial libraries that bind to the carboxyl terminus of Ras and interfere with its farnesylation without inhibiting the farnesyl transferase. The active molecules were selected by a screening against the carboxy-terminal octapeptide of Ras. CONCLUSIONS: The implications of our findings are twofold. First, we demonstrate that it is possible to prevent enzymatic transformations by blocking the enzyme's access to its substrate using a synthetic small molecule to mask the substrate. Second, we show that it is feasible to derive molecules from combinatorial libraries that bind a specific epitope on a protein by selecting these molecules with the isolated peptide epitope.

Alkyl and Aryl Transferases↗
PubMed1989

Theoretical issues in the regulation of genetically engineered organisms: the case of deliberate release.

At the cutting edge of research in biotechnology is the production of special genetically engineered organisms for use in an open, agricultural environment. We argue that the standard approaches to risk assessment and management employed by regulatory agencies are inadequate to the task of properly assessing the advisability of such experiments, as well as the even more significant prospect of widespread commercial use of genetically engineered organisms in agriculture. Given the current lack of sufficient information with which to make competent assessments of the risks involved and the attempts to gain such information in a timely fashion, we conclude that a compelling case for deliberate release programs has not been made.

Agriculture↗
PubMed1984

Competency to consent to medical care: toward a general view.

Psychiatrists working in consultation-liason services are often called upon to assess the competency of patients who are under the primary care of other physicians. Despite the frequency with which this sort of problem is encountered, no clinically useful guidelines seem to exist to aid the clinician in making such an assessment. In fact, a number of very different sorts of "tests" for competency to consent to medical care seem to exist and are used in practice. This essay attempts to make some headway in defining a general set of clinically useful criteria for the determination of competency to consent to medical care. This is done by looking at the central elements of informed consent itself and then asking what capabilities are required by anyone seeking to give consent to medical care.

Adult↗
PubMedDate not supplied

Suicide and public policy: a critique of the "new consensus".

Several writers have recently developed proposals calling for a public policy that would allow a number of individuals to commit suicide if they so choose. Suicide, it is argued, is a fundamental matter of personal liberty and as such only very minimal restrictions should be placed on it. In this essay I offer a critique of these views and the public policies they entail. The result is a defense of the general outlines of current professional and legal policies which permit intervention, even coercive intervention, with suicidal persons in almost every case.

Adult↗