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Biomedical subjects

M Hyman

Publications and source records attributed to M Hyman.

At least 19 recordsLinked to original sources
PubMed2003

Field measurements and modeling of dilution in the wake of a US navy frigate.

A field measurement and computer modeling effort was made to assess the dilution field of pulped waste materials discharged into the wake of a US Navy frigate. Pulped paper and fluorescein dye were discharged from the frigate's pulper at known rates. The subsequent particle and dye concentration field was then measured throughout the wake by a following vessel using multiple independent measures. Minimum dilution of the pulped paper reached 3.2 x 10(5) within 1900 m behind the frigate, or about 8 min after discharge. Independent measures typically agreed within 25% of one another and within 20% of model predictions. Minimum dilution of dye reached 2.3 x 10(5) at a down-wake distance of approximately 3500 m, or roughly 15 min. Comparison to model measurements were again within 20%. The field test was not only successful at characterizing wake dilution under one set of at-sea conditions, but was successful at validating the computer model used for assessing a wide range of ships and conditions.

Computer Simulation↗
PubMed2001

Hand assisted laparoscopic donor nephrectomy: a comparison with the open approach.

PURPOSE: Hand assisted laparoscopy combines aspects of open and laparoscopic surgery. A hand in the abdomen may facilitate laparoscopic live donor nephrectomy, allowing more urologists to participate. We report and compare our initial series of hand assisted laparoscopy donor nephrectomy with nephrectomy performed by standard open methods. MATERIALS AND METHODS: In the last 18 months 60 patients at 2 institutions underwent hand assisted laparoscopy donor nephrectomy. This cohort was compared to a contemporary group of 31 patients who underwent open donor nephrectomy via a flank incision at our 2 institutions. Demographic and outcome data were compared retrospectively in a nonrandomized fashion in the 2 groups. RESULTS: Demographic data on patient age, male-to-female ratio and body mass index were similar in the 2 groups. Operative time, transfusion rate, time to oral intake and complications were also similar. However, estimated blood loss, change in hematocrit preoperatively to postoperatively, hospitalization, parenteral and oral narcotic requirement, and donor convalescence were significantly less in the hand assisted laparoscopy versus open groups. In terms of allograft function, nadir creatinine, time to nadir creatinine, creatinine clearance at 6, 12, and 18 months, delayed graft function, episodes of acute rejection and ureteral stricture were similar in the groups. CONCLUSIONS: Hand assisted laparoscopy is safe, efficacious and reproducible for living related donor nephrectomy. Compared with the open technique hand assisted laparoscopy provides the donor with significantly decreased postoperative morbidity, while enabling excellent allograft function. Further randomized prospective studies are warranted.

Adult↗
PubMed1996

Inhibition of Growth of a Graphium sp. on Gaseous n-Alkanes by Gaseous n-Alkynes and n-Alkenes.

The growth of a filamentous fungus, a Graphium sp., on n-alkanes (C(inf2) to C(inf4)) was inhibited by low concentrations of acetylene, propyne, 1-butyne, ethylene, and propylene. Acetylene and other unsaturated hydrocarbons had no effect on the growth of the Graphium sp. on potato dextrose broth, ethanol, or acetate. Our results suggest that n-alkynes and n-alkenes are selective inhibitors of a nonspecific monooxygenase enzyme responsible for the initial oxidation of n-alkanes.

Journal Article↗
PubMed1979

Judging personality and appearance from voice disorders.

This study examined the effect of voice disorders on judgments of personality and appearance. One-hundred-and-five college students evaluated the personality and appearance characteristics of 12 speakers, four with normal voice quality, four with harsh-breathy voice quality, and four with hypernasal voice quality. A semantic differential procedure was employed to obtain ratings on 12 bipolar adjectives. Results indicate a significant difference between the normal and disordered voices. Voice disorders elicit more negative responses on judgments of personality and appearance of the speaker. These findings indicate that voice disorders warrant correction.

Adolescent↗
PubMed1979

Research trends in the field of speech and hearing.

Topics of research in the field of speech and hearing were identified and compared over a 21-yr period (1954--1974). These topics were identidied by a key-word analysis of approximately 8200 titles consisting of articles in national and international journals, and of theses and dissertations presented in the state of Ohio. Results of this analysis have pinpointed certain research trends in the field of speech and hearing. Attention to certain topics has either declined, increased, or reached a peak during the 21-yr period, while interest in some topics has been consistently maintained throughout the years. The information reported provides a perspective from which to view contributions made by researchers in the field of speech and during the last two decades.

Abstracting and Indexing↗
PubMed1978

The fit between journals and theses.

The titles of a substantial sample of articles related to speech pathology and audiology over a period of 21 years were catalogued under one or more of 10 categories, e.g., normal audition, defective phonation, and the like. The titles of theses and dissertations in this field of six universities of Ohio over the same period were also catalogued. The articles appeared in 17 journals. The journals were treated as seven groups of "related" journals. The total output of journals was stable over the period studied; a "group" of journals tended to be consistent with itself over successive 3-year periods; the seven groups of journals tended to be unique, and not to replicate each other. The topics treated in the journals were accepted as a criterion for contemporaneousness. The student output of the universities varied in contemporaneousness from one school to another, ranging upward to r = 0.98 (10 categories). The overall correlation between the student and the journal outputs was r = 0.79.

Academic Dissertations as Topic↗
PubMed1977

Children's perception of nasal resonance.

The purpose of this study was to investigate children's perception of nasal resonance in other children. A total of 120 elementary-school-aged children listened to four female children's voices with normal resonance to severe hypernasality and responded to a total of 20 questions. All children responded negatively to severe hypernasality in other children. The findings indicate that hypernasality warrants correction.

Child↗
PubMed1975

Relationship of acoustic parameters and perceptual ratings of esophageal speech.

For 10 male and 10 female esophageal speakers selected acoustic and perceptual dimensions of esophageal speech were investigated to determine the intercorrelations of the following measures: intelligibility, articulation, rate, fundamental frequency, mean relative intensity, and effectiveness. Results indicate that only articulation and effectiveness were significantly correlated with intelligibility, whereas measures of intelligibility, articulation, rate, fundamental frequency, and mean relative intensity were all significantly correlated with effectiveness ratings.

Acoustics↗