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Biomedical subjects

S M Woods

Publications and source records attributed to S M Woods.

At least 19 recordsLinked to original sources
PubMed1996

Effect of medicating ingredients and other additives on microflora present on swine and chicken feeds from a Manitoba mill.

The occurrence of microfloral components on medicated and non-medicated swine and chicken feed pellets and crumbles, produced in a Manitoba feed mill between June 1991 and October 1992, was determined. Addition of medicates to feeds generally decreased bacterial incidence and increased that of Eurotium spp. fungi. The effect was less pronounced when copper sulphate was added to medicated swine feeds.

Animal Feed↗
PubMed1995

The effect of transducer bandwidth on ultrasonic image characteristics.

PURPOSE: This study was conducted to determine the effect of transducer bandwidth on the characteristics of ophthalmic ultrasound images. METHODS: B-scan images produced using two transducers, one with a narrow bandwidth and the other with a broad bandwidth, both having nominal center frequencies of 10 MHz, were evaluated. Comparative scans were made of a tissue-mimicking phantom, an intraocular tumor, and a vitreous hemorrhage. RESULTS: Results showed that broadband transducers gave improved resolution and finer speckle texture, but had lower sensitivity. Broadband transducers were most suitable for situations in which resolution was more important than sensitivity, such as imaging of tumors. The greater sensitivity of the narrowband probe made it most useful for evaluation of vitreous complications, such as hemorrhage and membranes. CONCLUSION: In addition to transducer frequency, bandwidth should be taken into account when choosing a transducer for a specific ophthalmic imaging application. Both broad- and narrowband transducers have relative advantages in particular applications.

Ciliary Body↗
PubMed1993

Measurement of ocular tumor volumes from serial, cross-sectional ultrasound scans.

A system has been developed to determine intraocular tumor volume, a characteristic that has been estimated in previous studies from linear dimensions using a variety of models. Volume was determined by tracing tumor boundaries in sequential, parallel ultrasound scans, adding the areas and multiplying by the interslice interval. The in vitro accuracy of the technique was within +/- 2%. The mean difference between volumes determined from replicate in vivo scans of intraocular tumors was 4.3%. Serial scan volumes were, on average, 19% smaller than volumes computed from an ellipsoidal model and 13% smaller than area-rotational volumes. Differences of as much as 50% were observed between serial scan volumes and volumes computed with these models. The results indicate that methods based on either linear measurements or the tumor area in a single cross-section will tend to both systematically overestimate tumor volume and suffer from unpredictable, nonsystematic errors.

Humans↗
PubMed1991

Cataract surgery in anticoagulated patients.

A prospective study was performed on 31 patients having planned extracapsular cataract extraction with posterior chamber intraocular lens implantation. The patients were considered to be anticoagulated because of the medications they were taking. The patients were instructed to continue their usual medications throughout the perioperative period including the day of surgery. All patients had routine narcoleptic sedation and retrobulbar anesthesia. The surgical technique was altered to use an inferior corneal traction suture and a single planed clear corneal incision. No intraoperative or postoperative anterior chamber bleeding was seen. The observed complications were increased awareness of corneal sutures, increased endothelial cell loss, delayed visual rehabilitation from with-the-rule astigmatism, and transient corneal edema. All patients achieved 20/40 or better visual acuity without corneal edema by three months post-surgery.

Aged↗
PubMed1990

Chloroquine-resistant Plasmodium falciparum malaria at Nchelenge, northeastern Zambia. Follow-up on 515 hospital patients.

From 1986 until 1988 chloroquine sensitivity of Plasmodium falciparum malaria was monitored in 515 hospital patients in Nchelenge district, northeastern Zambia. After treatment with chloroquine 30 mg base/kg, bloodslides were examined on day 2, 4, 6 and 7. The overall resistance rate was 21.4%, of which 29% was R1-, 30% R2-, 18% R3- and 23% R2-3 resistance. Resistance rates were negatively correlated with age and positively with the initial parasitemia. It is suggested that in vivo tests of chloroquine sensitivity also reflect the host's immune status for malaria. In rural areas with chloroquine resistance in vivo testing should be performed on all malaria patients.

Adolescent↗
PubMed1978

A national survey of resident assessment methods.

The authors distributed a questionnaire regarding the assessment of psychiatric residents to 130 directors of residency training programs. Formal examinations were required by 37% of the programs and were being considered by an additional 49%, suggesting that formal examinations may be an integral part of residency training programs within five years. The authors believe that this trend toward utilization of objective measures reflects a growing national concern with accountability in medicine.

Clinical Competence↗
PubMed1976

Some dynamics of male chauvinism.

Male chauvinism was studied in the psychoanalytic therapy of 11 men. It refers to the maintenance of fixed beliefs and attitudes of male superiority, associated with overt or covert depreciation of women. Challenging chauvinist attitudes often results in anxiety or other symptoms. It is frequently not investigated in psychotherapy because it is ego-syntonic, parallels cultural attitudes, and because therapists often share similar bias or neurotic conflict. Chauvinism was found to represent an attempt to ward off anxiety and shame arising from one or more of four prime sources: unresolved infantile strivings and regressive wishes, hostile envy of women, oedipal anxiety, and power and dependency conflicts related to masculine self-esteem. Mothers were more important than fathers in the development of chauvinism, and resolution was sometimes associated with decompensation in wives.

Anxiety↗
PubMed1976

Teaching dynamic psychotherapy by observation.

Experience with a seminar demonstrating psychotherapy, interviews with 12 of the treated patients, and a survey of 23 residents have shown the value of this teaching method and its effect on the participants. Generally the patients felt helped and residents were enthusiastic. The teaching format has many valuable features--most important being the inclusion of a faculty-observer.

Attitude of Health Personnel↗