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Biomedical subjects

R Goodman

Publications and source records attributed to R Goodman.

At least 91 records · Page 5Linked to original sources
PubMed1994

Specific region of the c-myc promoter is responsive to electric and magnetic fields.

The level of c-myc transcripts is increased in cells exposed to extremely low frequency (elf) electromagnetic (EM) fields at 60 Hz. The aim of the present experiments was to determine if regulatory regions upstream of the c-myc gene modulate the response to EM fields. DNA upstream of P1 of both mouse and human c-myc genes was transfected into cells as CAT constructs. The presence of DNA 5' to the human or mouse myc genes results in increased expression of CAT following 20 min exposures of cells to 60 Hz elf EM fields. Specific portions of the human upstream DNA were deleted and introduced into cells. The region responsive to EM fields is located between -353 and -1,257 relative to the P1 promoter.

Animals↗
PubMed1994

A modified version of the Rutter parent questionnaire including extra items on children's strengths: a research note.

An expanded version of the Rutter parent questionnaire was administered to 320 schoolchildren with hemiplegia. Scores and caseness categories derived from the original Rutter items corresponded well with the findings of independent psychiatric evaluations. A measure of prosocial behaviour derived from 10 novel items had promising internal consistency, factorial independence and inter-rater reliability. Another six novel items loaded on the same factor as the three original Rutter hyperactivity items. The modified questionnaire may be useful with a wide range of children, particularly if the focus on children's strengths as well as weaknesses increases parental compliance and reduces halo effects.

Affective Symptoms↗
PubMed1994

Childhood hemiplegia: is the side of lesion influenced by a family history of left-handedness?

Family histories of left-handedness were obtained for 396 children with congenital or acquired hemiplegia. As in other studies, right-sided hemiplegia was substantially more common than left-sided hemiplegia. The excess of right hemiplegia was entirely accounted for by children with left-handed relatives. This is contrary to what would be expected if the preponderance of right hemiplegia reflected a greater vulnerability of the dominant hemisphere to early damage. Though the observed association between right hemiplegia and a family history of left-handedness may well have occurred by chance, it could potentially reflect some heritable aspect of cerebral asymmetry (such as slow development of the left hemisphere) that predisposes an individual both to left-handedness and to left-hemisphere injury.

Brain↗
PubMed1993

2'-substituted chalcone derivatives as inhibitors of interleukin-1 biosynthesis.

A series of 2'-substituted chalcone derivatives has been found to show potent inhibition of the production of IL-1 beta from human peripheral blood monocytes stimulated with lipopolysaccharide (LPS), with IC50 values in the 0.2-5.0-microM range. Some members of the series have also shown inhibition of septic shock induced in mice by injection of LPS, although with low potency. Qualitative structure-activity relationships have shown that the enone is required for activity, which may be mediated by conjugate addition of a biological nucleophile to the chalcone. Electron-poor aromatic rings beta to the ketone give enhanced potency. Although electronic effects in the other ring (directly attached to the ketone) are minimal, this ring must possess an ortho substituent for good activity without cytotoxicity, suggesting a degree of selectivity which would not be expected for simple, nonspecific alkylating agents.

Animals↗
PubMed1993

Electromagnetic fields and cells.

There is strong public interest in the possibility of health effects associated with exposure to extremely low frequency (elf) electromagnetic (EM) fields. Epidemiological studies suggest a probable, but controversial, link between exposure to elf EM fields and increased incidence of some cancers in both children and adults. There are hundreds of scientific studies that have tested the effects of elf EM fields on cells and whole animals. A growing number of reports show that exposure to elf EM fields can produce a large array of effects on cells. Of interest is an increase in specific transcripts in cultured cells exposed to EM fields. The interaction mechanism with cells, however, remains elusive. Evidence is presented for a model based on cell surface interactions with EM fields.

Animals↗
PubMed1992

Transcription in Drosophila melanogaster salivary gland cells is altered following exposure to low-frequency electromagnetic fields: analysis of chromosome 3R.

The use of the transcription autoradiographic method permits identification of nascent RNA chains directly on identifiable regions of Drosophila salivary gland chromosomes. Changes in transcriptional activity at 13 defined regions of the right arm of chromosome 3 (3R) were observed following 20-min exposures of salivary glands to five different extremely low frequency (ELF) electromagnetic (EM) fields. Changes in translational patterns were also induced by the ELF EM fields in exposed cells. Differences included an increase in over-all polypeptide synthesis as well as in the number of polypeptides resolved in cells exposed to EM fields.

Animals↗
PubMed1991

Phospholipase A2 (PLA2) activity in bovine pulmonary artery endothelial cells.

We have investigated the role of recombinant human interleukin-1 beta (rIL-1 beta) and recombinant human tumor necrosis factor alpha (rTNF-alpha) on PLA2 activity, protein synthesis and eicosanoid production in bovine pulmonary artery endothelial cells. Cellular PLA2 activity increased 4-fold and production of PGE2 increased 3-fold at 1-2 hrs in the presence of 10 units/ml rIL-1 beta. PLA2 activity increased 3-fold at 30 min and PGE2 production increased 2-fold with 5 x 10(-9) M rTNF-alpha. The data show that endothelial cells respond more rapidly to rIL-1 beta (2-6 hr) and rTNF-alpha (30 min) than do chondrocytes and synovial cells (6-16 hrs), suggesting endothelial cells may play a primary role in initiating the inflammatory response.

Animals↗
PubMed1991

Reliability of clinical ratings by trainee child psychiatrists: a research note.

Trainee and senior psychiatrists separately rated the symptoms and signs of 14 consecutive referrals to a child psychiatric team. Inter-rater reliabilities ranged from 0.61 to 0.94 on four clinically relevant dimensions of psychopathology. Aggregating all items, trainees' ratings identified whether or not items were definitely present with greater than 95% accuracy, as judged by a senior psychiatrist's ratings and a review of the case notes. This pilot study suggests that trainees' ratings can be of acceptable reliability for research purposes.

Affective Symptoms↗
PubMed1991

The use of progressive indicators as predictors of NCLEX-RN success and performance of BSN graduates.

Successful performance during the student's academic career contributes to his success on the NCLEX-RN. The purpose of this study was to determine predictors of success on the NCLEX preadmission and years 2, 3, and 4 variables in relation to NCLEX-RN scores. Data were obtained retrospectively from records of 408 baccalaureate nursing students. Preadmission variables were sex, age, race, and admission grade point average (GPA). Year 2 variables were numerical grades for the first two clinical nursing courses. Year 3 variables were numerical grades for clinical courses in mental health, adult health, and maternal child nursing. Year 4 variables were numerical grades in two senior clinical courses, percentile rank on NLN comprehensive exam, and graduate GPA. In NCLEX-RN scores, 67% of the variance was accounted for by admission GPA and race (33%), one 2nd year grade (an additional 14%), the 3rd year adult health grade (an additional 14%), the 3rd year adult health grade (an additional 11%), one 4th year theory grade, and the NLN comprehensive exam (an additional 9%). These results suggest that there are preadmission and sophomore year predictors of NCLEX-RN success which could be used to design early interventions for students performing poorly and at risk of failing the NCLEX-RN.

Achievement↗
PubMed1990

Changes in levels of c-myc and histone H2B following exposure of cells to low-frequency sinusoidal electromagnetic fields: evidence for a window effect.

Human HL-60 cells were exposed for 20 min to an electromagnetic field at frequencies ranging from 15 to 150 Hz and at densities from 0.2 to 2.3 mT (2 to 23 gauss). Following each exposure, quantitative levels of c-myc and histone H2B transcripts were determined by dot-blot hybridization analyses and compared with unexposed control samples. The most pronounced increase in each transcript occurred after exposure at 45 Hz, with levels more than four times that found in unexposed controls.

Cell Line↗
PubMed1990

Amplitude windows and transiently augmented transcription from exposure to electromagnetic fields.

The exposure of cells to relatively low-intensity, pulsed, low-frequency electromagnetic fields can result in a transient augmentation of mRNA synthesis. Under certain conditions of irradiation, the augmentation is a function of the strength of the electromagnetic field. A linear, multi-step, chemical-reaction model accounts for many of the principal features that are observed in both the time- and intensity-dependent variations of transcriptional effects. The crucial assumption in the model is that the direct effect of electromagnetic fields on exposed cells is an increase in the rate constant that characterizes one of the intermediate sequential reactions in the synthesis of mRNA.

Electromagnetic Fields↗
PubMed1990

Combined alpha/beta-blockade versus beta 1-selective blockade in essential hypertension in black and white patients.

The purpose of this multicenter investigation was to determine the efficacy and safety of the alpha/beta-blocker labetalol versus the beta 1-selective beta-blocker atenolol in white and black patients with essential hypertension. Equal numbers of black and white patients were enlisted to form four treatment groups (white patients taking either labetalol or atenolol and black patients taking either labetalol or atenolol). Two hundred ninety-two patients (152 white and 140 black patients) with essential hypertension characterized by a standing diastolic blood pressure of 105 to 119 mm Hg (inclusive) were recruited for this trial. Patients were randomized to either labetalol (dosage titrated from 200 to 1600 mg/day) or atenolol (dosage titrated from 50 to 100 mg/day). The therapeutic goal was achievement of a standing diastolic blood pressure of 90 mm Hg or less or a fall of 15 mm Hg in diastolic pressure from baseline value at the end of the placebo run in period. At the end of the study there were no significant differences in blood pressure or heart rate changes in the supine position between the labetalol and atenolol groups. In contrast, labetalol produced greater reduction in both the standing systolic and diastolic blood pressure (-12/-13 mm Hg, respectively) compared with atenolol (-7/-9 mm Hg; p less than 0.05; p less than 0.005, respectively). The greatest decrease in blood pressure was observed in white patients receiving labetalol. In black patients the decrease in blood pressure was greater in those treated with labetalol compared with atenolol, particularly with respect to the systolic blood pressure. We conclude that the alpha 1-blocking property of labetalol provides an additional lowering of the blood pressure over that seen with beta 1-blockade alone, especially in the standing position, and this enhanced efficacy is not confined to one radical group.

Atenolol↗
PubMed1990

Computer simulation in the design of local exhaust hoods for shielded metal arc welding.

Computer simulations were used to examine competing exhaust hood configurations for shielded metal arc welding. The welder's breathing zone concentration appears to be an inverse linear function of the computer-predicted hood capture efficiency. Hood aspect ratio, hood flow, and the welder's position relative to the hood all have a significant effect on the breathing zone concentration. The height of the hood above the welding surface showed no significant effect in reducing breathing zone concentration. Further examination of breathing zone concentration as a function of capture efficiency is needed before reliable design methods can be developed using this parameter.

Air Movements↗
PubMed1990

Delayed visual maturation and autism.

Three boys are described with a mixed developmental disorder, which so far appears to have a relatively good prognosis. Each boy presented in early infancy with visual unresponsiveness, which spontaneously resolved. This delayed visual maturation was accompanied or followed by severe autistic impairment, general developmental delay, hypotonia and clumsiness. Subsequent progress has been unexpectedly favourable, with striking improvements in language, play, social interest and social competence. Widespread, patchy delay in brain maturation could possibly account for this combination of delayed visual maturation and autism, with a good prognosis.

Autistic Disorder↗