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Biomedical subjects

M Young

Publications and source records attributed to M Young.

At least 289 records · Page 16Linked to original sources
PubMed1988

Reliability of health knowledge measurement in very young children.

This study documented reliability of a picture identification instrument and determined its utility with young children in selected preschool programs. Three hundred eleven children, ages three-five, were selected from formal early childhood education programs in three states. A comprehensive health knowledge instrument, consisting of 30 items, was administered to all children, and a retest was administered two weeks later to a 20% randomly selected subsample. Data analysis included reliability assessments and systematic modification of the instrument. Pearson's Product Moment Correlation and Kuder Richardson 21 analyses indicated the instrument is reliable when administered individually to children ages three-five. The authors recommended this instrument, or a similar picture identification instrument, be used to assess comprehensive health knowledge.

Achievement↗
PubMed1988

Deduced polypeptides encoded by the Bacillus subtilis sacU locus share homology with two-component sensor-regulator systems.

The sacU locus has been cloned by using two independent strategies, and the presence of two open reading frames was deduced from the nucleotide sequence. Open reading frame 1 encodes a 45,000-dalton polypeptide that is similar to the products of the Salmonella typhimurium cheA and Escherichia coli cpxA genes, which act as sensory transducers. Open reading frame 2 encodes a 26,000-dalton polypeptide that is similar to a family of transcriptional activators, including the products of the Bacillus subtilis spoOA and spoOF and the E. coli ompR and dye genes. These similarities suggest that the products of the B. subtilis sacU locus form a sensor-transducer couple, which functions to relay information about specific environmental changes to the transcription apparatus.

Amino Acid Sequence↗
PubMed1988

General practice geriatric surveillance scheme.

This project converted an on-demand, crisis intervention service into a doctor-initiated, anticipatory, preventive programme to improve management, based on home visiting and 'activities of daily living' screening by state enrolled nurse, with serial medical assessment and regular surveillance by the general practitioner. Opportunistic and domiciliary organised, standardised, serial, numerically scored, medical, social and functional assessment of list patients over 75 years, allowed comparison over time and identification of high need/risk patients--focus for anticipatory service and aids provision. 24% healthy, 41% moderately impaired and 35% high risk patients were contacted or visited annually, six-monthly and quarterly respectively. Patient-initiated calls decreased by 41% but additional surveillance input increased work load by 9% per annum. Improved standards of care helped patients live longer at home however. The nurse proved effective and economical in this role.

Activities of Daily Living↗
PubMed1988

Outpatient treatment of pelvic inflammatory disease with cefoxitin and doxycycline.

Sixty-three women with abdominal pain and adnexal tenderness were enrolled in a study of ambulatory treatment of acute pelvic inflammatory disease. Treatment consisted of 2 g of cefoxitin intramuscularly and 1 g of probenecid orally, followed by doxycycline, 100 mg by mouth twice daily for 14 days. Patients were stratified into groups indicating whether pelvic inflammatory disease was probable, possible, or unlikely, based upon endometrial biopsy and clinical criteria. Among 52 women who were evaluated, Chlamydia trachomatis and/or Neisseria gonorrhoeae were initially recovered from 16 (67%) of 24 with probable pelvic inflammatory disease, three (33%) of 11 with possible pelvic inflammatory disease, and three (18%) of 17 in whom pelvic inflammatory disease was considered unlikely. Of the 24 patients with probable pelvic inflammatory disease, 22 (92%) were clinically cured or improved. Of 22 patients initially infected with C trachomatis and/or N gonorrhoeae, 20 were culture-negative for both organisms after therapy. Both microbiologic failures had been reexposed. This study suggests that the combination of cefoxitin and doxycycline is effective for ambulatory treatment of pelvic inflammatory disease.

Adult↗
PubMed1988

Parenting during mid-adolescence: a review of developmental theories and parenting behaviors.

Developmental literature on adolescence is reviewed with emphasis on the span between 15 and 17 years. Characteristics seen in the competent parent are identified. A chart illustrates specific parental competencies expected during mid and late adolescence, based on theory analysis. Areas of strength and potential problems for the young teenaged parent are examined. Among the deficits identified for the mid-adolescent parent are caregiving skills and affective behaviors including empathy and stimulation. Based on the resolution of developmental tasks, it is evident that a self-view as competent parent is dependent on achieving a sense of identity. Suggestions for interventions and further research focus on increasing the parental competence of the adolescent mother.

Adolescent↗
PubMed1987

Urokinase: a chemotactic factor for polymorphonuclear leukocytes in vivo.

The effects of injecting urokinase into subdermal air sacs on the back of mice was studied. Urokinase was leukotactic in the concentration range of 2 X 10(-13) to 2 X 10(-15) M. This response was absolutely dependent on the enzyme activity of the serine esterase, but was found to be independent of generation of the chemotactic complement split product C5a. At high doses of urokinase (greater than 2 X 10(-12) M), no cellular infiltration was observed. Injection of 2 X 10(-10) M urokinase i.p. led to the systemic desensitization of mice when challenged in the skin with a lower dose (2 X 10(-14) M) of urokinase. Urokinase desensitization did not alter the ability of mice to respond to the chemical chemotactic factor f-met-leu-phe or to respond to C5a-dependent chemotactic stimuli. Urokinase desensitized mice failed to demonstrate a chemotactic response to nerve growth factor, thrombin, plasmin, or factor X activating enzyme, all of which were chemotactic in non-urokinase pre-treated animals. The results of these studies indicate the presence of three physiologically independent inflammatory pathways in mice: independent of C5 and not influenced by pretreatment with urokinase, independent of C5 and inhibited by pretreatment with urokinase, and dependent on C5 and not influenced by pretreatment with urokinase.

Animals↗
PubMed1987

Inactivation of the proteolytic activity of mouse nerve growth factor by human C1(activated)-inhibitor.

The interaction between the serine protease gamma subunit of NGF (gamma-NGF) and human C1(activated)-inhibitor (C1-Inh) has been studied. C1-Inh inactivates the protease activity of gamma-NGF as measured by its ability to cleave the synthetic substrate benzoyl-arginine-p-nitroanilide (L-BAPNA). Experiments in which gamma-NGF and C1-Inh were mixed at differing molar ratios indicated that inhibition was due to the formation of a 1:1 stoichiometric complex. Analysis of the interaction of 125I-labeled gamma-NGF with C1-Inh by SDS-PAGE and autoradiography indicated that a covalent bond was formed between gamma-NGF and C1-Inh. The covalent bond was hydrolyzed by hydroxylamine, which suggested that the two proteins were linked via an acyl linkage. The formation of this complex was time dependent and required the proteolytic activity of the gamma-NGF.

Animals↗
PubMed1987

Control by insulin and insulin-related growth factor 1 of protein synthesis in a cell-free translational system from chick-embryo fibroblasts.

Insulin and insulin-related growth factor 1 (IGF-1) increase by 1.5-1.6-fold the rate of [3H]leucine incorporation into protein in primary monolayer cultures of chick-embryo fibroblasts (CEF); half-maximal hormone concentrations are 10 and 0.25 nM respectively. To investigate the mechanism of this effect, a rapid method is used to prepare a lysate from CEF which is active in protein synthesis. Lysate derived from cells treated for 30-150 min with insulin synthesized protein at 1.8-3.0-fold greater rate than did controls; the increased rate persisted for 20 min in vitro. Pactamycin (0.5 microM), an inhibitor of peptide-chain initiation, inhibited protein synthesis by 50% in lysates derived from insulin-treated and control cells. Thus insulin and IGF-1 cause an increase in the protein-synthesis rate in vivo, which persists in cell-free protein-synthesizing lysates of CEF.

Animals↗
PubMed1987

A plausible mechanism for large-scale chromosomal DNA amplification in streptomycetes.

Recent advances in our understanding of the structure of highly amplified DNA sequences in Streptomyces fradiae and lividans have enabled us to formulate a possible mechanism by which amplification may occur. An essential feature of the model is the generation of an amplification precursor, which comprises a circularised copy of the DNA to be amplified, attached to one arm of the chromosome by a replication fork. Multiple copies of the amplifiable DNA are generated by rolling circle replication. The model adequately accounts for many features of gene amplification in these two species, including the tendency for deletions to occur to one side, but not the other, of the amplified DNA.

Chromosomes, Bacterial↗
PubMed1987

Isolation and characterization of a nuclear depressive syndrome.

We investigated the nosology of endogenous depression by numerical taxonomy. Five hundred and sixty-nine patients diagnosed as having unipolar major depressive disorder in the NIMH Clinical Research Branch Program on the Psychobiology of Depression-Clinical were studied. Thirty-six symptoms which might distinguish endogenous from non-endogenous depressions were chosen from the literature. Patients' symptom profiles assessed by structured interview were grouped by two methods: a K-means improvement of Ward's method of cluster analysis, and a latent class algorithm. The methods produced very similar groups and several internal validity criteria suggested that the groups were not spurious. Cluster 1, 'nuclear depression,' included a nucleus of patients common to multiple definitions of endogenous depression. The non-nuclear group scored as less neurotic than the nuclear group on personality tests administered during the index episode. The groups do not differ in frequency, number or severity of reported life events prior to onset of the index episode. The nuclear group shows a poor prognosis on two-year prospective follow-up, greater disturbance on personality inventories, and increased heritability of depression in siblings.

Adult↗
PubMed1987

Effect of dietary ascorbic acid intake on tissue vitamin C in mice.

The effect of graded levels of dietary ascorbic acid on blood and tissue ascorbic acid levels in mice has been studied. Six levels of dietary ascorbic acid (0, 0.076, 0.5, 1, 5 and 8%) were used. Plasma ascorbic acid rose as dietary ascorbic acid intake increased from 1 to 8%. Mice fed a diet with 5 or 8% added ascorbic acid had significantly higher levels of ascorbic acid in the heart, kidney, lung, muscle and spleen than did control mice fed an ascorbic acid-free diet. Mice fed a diet with 1% added ascorbic acid had elevated ascorbic acid levels in the heart, kidney, lung and spleen. No significant change was observed in ascorbic acid level in the brain, adrenal gland or leukocytes in any of the experimental groups. Ascorbic acid level in the eyes was only slightly higher in mice fed a diet containing 8% added ascorbic acid than in control mice. The observation that the kidney had the greatest increase in ascorbic acid content suggests that the kidney may be a very important organ not only in elimination but also in catabolism of this vitamin. A diet containing 0.5 or 0.076% added ascorbic acid did not significantly increase ascorbic acid content in any of the organs studied. Mice fed a diet with 0.076% added ascorbic acid had slightly, but statistically significantly, lower levels of ascorbic acid in the liver, lung, muscle and spleen that control mice. Mice fed a diet with 0.5% added ascorbic acid had a lower ascorbic acid content in the liver and muscle than the controls.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1987

Delirium and pulmonary edema after completing a marathon.

Pulmonary edema is a rare complication of distance running. All 4 previously reported cases occurred after triathalons or ultramarathons. We report the first case of pulmonary edema in a healthy but untrained runner after a conventional 42-km marathon race. This is also the first reported case of pulmonary edema complicating distance running in which hemodynamic measurements have been made. The pulmonary capillary wedge pressure was low. The cardiac index was initially depressed, and the arterial-venous oxygen tension difference was high, but the latter abnormalities disappeared after volume infusion. These hemodynamic data suggest that pulmonary edema in this distance runner was predominantly noncardiogenic. The etiology of the edema is uncertain, but concurrent hyponatremia and cerebral edema were present in this patient, as in 2 previously reported cases, suggesting that neurogenic pulmonary edema caused by water intoxication may be a contributing factor in pathogenesis.

Adult↗
PubMed1987

Observations on the energy and redox state and protein synthetic rate in animal and human placentas.

The energy and redox states of placentas in newly anesthetized or sacrificed guinea pigs and sheep were compared with that of human placentas immediately after delivery. Subsequently the effect of ischemia was observed in both human and animal placentas. The influence of perfusion, using a fluid containing oxygenated red cells (adult human) was studied in the human placenta. Adenine nucleotide precursors were added to the perfusion fluid in an attempt to improve the energy and redox states and the mixed protein synthetic rate of the tissue. The ATP and lactate concentrations in guinea pig placental tissue taken immediately after nembutal anesthesia were 1.16 and 3.59 mmol kg-1 wet weight respectively. One minute's ischemia caused a fall in ATP to 0.7 and a rise in lactate to 6.5 mmol kg-1. The concentration of ATP in human placental tissue, 30 secs to 3 minutes after delivery of the organ, was 0.52 and of lactate 4.8 mmol kg-1 wet weight, suggesting that some biochemical deterioration had already occurred. A further fall in ATP to 0.21 and rise in lactate to 6.4 mmol kg-1 wet weight took place during 20 mins of ischemia; thereafter the ATP level remained constant while the lactate continued to rise to 11 mmol kg-1 wet weight by 1 1/2 hours. The initial energy charge was similar in both animal and human placentas, 0.8-0.9, and was only reduced during prolonged hypoxia at 37 degrees C. Since the AMP did not rise to the same extent as in other tissues, it is suggested that the Atkinson equation used in the calculation of energy charge may not be applicable to the placenta, and that the most sensitive indication of deterioration in energy status is the swift fall in ATP concentration. Rapid establishment of maternal intervillous perfusion of an isolated lobule of the human placenta using ixygenated RBCS in the perfusion fluid, enabled the ATP and lactate levels to be maintained near to 'in vivo' values during one hour, with a protein turnover rate of 40% day-1, two thirds of that observed 'in vivo' in the sheep. The addition of 1.0-50 microM adenosine to the perfusion fluid improved the energy state of the tissue, but not its redox state nor protein synthetic rate. 1.5 microM inosine in the perfusion medium did not alter the energy state but caused a marked reduction in lactate production.

Adenosine↗