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Biomedical subjects

J Newman

Publications and source records attributed to J Newman.

At least 235 records · Page 13Linked to original sources
PubMed1984

Norms for hand grip strength.

Norms for hand grip strength of healthy children are presented. Sex and age specific centiles for age 5 to 18 years have been determined using a portable strain gauge dynamometer with an accuracy of 0.5 N. The test group comprised 1417 healthy, urban school children from a middle class suburb of Brisbane. Mean maximum grip strength (of four tests, two with each hand) and mean peak grip strength (best of four tests) were recorded. Mean values of peak grip strength were 10 to 15% higher than the average maximum grip in all age groups. At all ages girls had a reduced grip strength compared with boys and although boys manifested a continual, approximately linear increase in grip strength through all age groups, girls manifested an approximately linear increase up to 13 years after which mean hand grip usually remained constant. By the age of 18 years boys had a mean grip strength some 60% higher than girls. Correlations with height and weight are also presented. "Handedness' influenced grip strength and was most noticeable in children aged over 10 years. The clinical use of hand grip strength centiles for the early indication of neurological and muscular disorders and for following the natural history of neuromuscular disease is discussed.

Adolescent↗
PubMed1984

Glucose-6-phosphate dehydrogenase deficiency in Southeast Asian refugees entering the United States.

Glucose-6-phosphate dehydrogenase (G6PD) deficiency is an inherited disorder of red blood cell metabolism. Affected individuals may suffer a severe hemolytic crisis when treated with primaquine, an antimalarial. A survey of 966 male Southeast Asian refugees determined that 50 (5.2%) were G6PD-deficient. This prevalence suggests that a G6PD assay should be performed prior to primaquine therapy in this high-risk population.

Adult↗
PubMed1984

Role of neurotensin in pancreatic secretion.

The objective of this study was to examine the effect of neurotensin (NT) on pancreatic exocrine secretion in awake dogs (n = 5) with chronic gastric and pancreatic fistulas. Intravenous (IV) infusion of NT (1 microgram/kg/hr) alone significantly stimulated pancreatic secretion of protein and bicarbonate without causing release of secretin or cholecystokinin-33 (CCK-33). IV NT potentiated the secretory response of pancreatic bicarbonate to the intraduodenal (ID) infusion of HCl alone and to ID infusions of the amino acids, phenylalanine and tryptophan (AA) alone, as well as to an ID mixture of AA plus HCl. IV NT acted in an additive manner with ID AA, ID HCl, or ID AA plus HCl in the stimulation of pancreatic protein output. The addition of IV NT to each luminal secretagogue (ID AA, ID HCl, or ID AA plus HCl) failed to elevate plasma concentrations of CCK-33 or secretin over those observed during ID infusion of each secretagogue alone. ID corn oil (Lipomul) stimulated the simultaneous release of CCK-33, NT, and secretin significantly; IV infusion of NT (0.5 microgram/kg/hr) resulted in plasma NT levels that were similar to levels observed after ID Lipomul. These studies provide evidence that endogenous NT, CCK, and secretin may interact in the physiologic regulation of pancreatic exocrine secretion.

Amino Acids↗
PubMed1984

Eosinophilic cystitis with giant cells. A light microscopic and ultrastructural study.

We report a case of eosinophilic cystitis. The wall of the urinary bladder was infiltrated by abundant eosinophils, numerous mast cells, neutrophils, and dispersed giant cells. Electron microscopic examination showed that the giant cells were macrophage polykaryocytes. We discuss their possible relationship to an allergic reaction, as well as to the previous use of radiation therapy 23 years ago. Granulomas were not observed.

Cell Nucleus↗
PubMed1983

Innovations in platysma rhytidectomy.

Cervical and submental deformities are the major complaints of many patients who have had rhytidectomies. Unfortunately, traditional rhytidectomy techniques have failed to provide satisfactory and lasting results in this region. During recent years, the superficial muscular aponeurotic system has been described and multiple platysma surgical techniques introduced. Our technique emphasizes a youthful cervical and submental region. It involves an anterior submental incision, total surgical excision of the anterior platysma bands, conservative submental lipectomy, routine rhytidectomy dissection, submandibular and mandibular fat contouring, and division and rotation of platysma flaps. This technique has been used for two years on 94 patients. There have been no complications specifically related to this technique.

Dermatologic Surgical Procedures↗
PubMed1983

The fate of dibenz[b,f]-1,4-oxazepine (CR) in the rat, rhesus monkey and guinea-pig. Part I. Metabolism in vivo.

The fate of dibenz[b,f]-1,4-[11(14)-C]oxazepine (CR) in rats, rhesus monkey and guinea-pig and in isolated perfused rat livers has been examined. 14C-CR was administered to rats at doses from 1.56 to 3470 mumol/kg and irrespective of dose or route of administration most (59-93%) was eliminated in the urine as primarily the sulphates of the 7-, 4- and 9-hydroxylated 10,11-dihydrodibenz[b,f]-1,4-oxazepine-11(10H)-one. In blood, both in vivo and in liver perfusates, CR concentrations decreased biphasically to be replaced initially with CR-lactam (dihydrodibenz[b,f]-1,4-oxazepine-11(10H)-one), followed by the sulphates of the 7-, 4- and 9-hydroxylactams. The rate of disappearance of CR in liver perfusates was slower than in vivo. Bile contained only small amounts of sulphate conjugates and significant amounts of conjugated 2-amino-2'-hydroxymethyldiphenyl ether (amino alcohol). This was not identified in the urine or blood of rats. Preliminary studies in rhesus monkey and the guinea-pig show similar excretory patterns and metabolites. However, only free hydroxylactams were isolated from monkey urine and traces of the amino alcohol were detected in guinea-pig urine. Whole-body autoradiography of mice confirm the rapid disappearance of CR from blood into heart, liver, kidneys and small intestine with evidence of biliary excretion. It is consistent with the rat studies showing the rapid absorption of a highly lipophilic compound undergoing hepatic metabolism, biliary secretion, enterohepatic recirculation and renal excretion.

Animals↗
PubMed1983

The fate of dibenz[b,f]-1,4-oxazepine (CR) in the rat. Part II. Metabolism in vitro.

CR (dibenz[b,f]-1,4-oxazepine) is metabolized by rat liver 105 000 g supernatant fractions by (a) ring opening and reduction to 2-amino-2'-hydroxymethyldiphenyl ether and (b) oxidation at C11 to give a cyclic lactam. Reaction (a) is NADPH-dependent, decreased by dialysis and methylene blue, whereas reaction (b) is heat-resistant, inactivated by dialysis, inhibited by CN-, p-chloromercuribenzoate, amytal and menadione, and stimulated by methylene blue, phenazine methosulphate and 2,6-dichlorophenol indophenol. Reaction (a) is similar to that of aldehyde reductases (E.C.1.1.1.2) and reaction (b) to that of molybdenum hydroxylases (E.C.1.2.3.1). Reaction (a) is also catalysed by an NADH-dependent enzyme in liver microsomes and subsequent hydroxylation of the lactam also occurs in this cell fraction. Some extrahepatic metabolism of CR occurs via the same routes in kidney, small intestine and lung, though the yield is limited. Digestive gland extract of Helix pomatia converts CR to its lactam in significant amounts. The metabolism of CR in vitro is similar to that predicted from observations in vivo.

Animals↗
PubMed1983

The fate of dibenz[b,f]-1,4-oxazepine (CR) in the rat. Part III. The intermediary metabolites.

The fates of several intermediates of dibenz[b,f]-1,4-oxazepine (CR) metabolism in vivo and in vitro in rats have been examined to establish the metabolism and excretory sequence of CR. The ring-opened 2-amino 2'-hydroxymethyldiphenyl ether (amino alcohol) added to isolated perfused rat liver was rapidly cleared in bile as a mixture of highly polar conjugates, whereas the major route of excretion in vivo was as the 4-, 7- and 9-hydroxylactam sulphates in urine. The lactam of CR was eliminated exclusively in urine giving the same products as obtained for CR, but the distribution of metabolites of the C10-C11 dihydro derivative of CR was unlike that of the parent compound indicating that it occupies only a peripheral role in the fate of CR in vivo. A mixture of 7-, 4- and 9-hydroxylactams derived from the enzymic hydrolysis of urinary sulphates was rapidly removed from blood, sulphated and secreted as sulphates into blood both in vivo and in isolated perfused liver. Little biliary excretion occurred. When the urinary sulphates of the hydroxy lactams were administered i.v. to rats, 70% was eliminated in urine within 1 h; however, if the kidneys were ligated biliary excretion of sulphate was higher (58% in 5 h). After intraduodenal administration of the biliary conjugates of CR metabolism, all of the dose was resorbed to be re-secreted in bile or excreted as sulphates in urine. These studies confirm that the major metabolic fate of CR in the rat is oxidation to lactam, followed by ring hydroxylation, sulphation and urinary excretion.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1982

Hydrodynamic determination of molecular weight, dimensions, and structural parameters of Pf3 virus.

Measurements of the translational, DT, and rotational, DR, diffusion coefficients of Pf3 virus by low-angle polarized intensity fluctuation spectroscopy and field-free transient electric birefringence, respectively, give a length of 720 +/- 25 nm and diameter of 6.5 +/- 1.5 nm upon simultaneous solution of the Broersma equations for rigid rods. Sedimentation coefficient and density increment values obtained under solvent conditions identical with those of DT give a molecular weight of (13.4 +/- 0.8) x 10(6) g mol-1, which gives a mass per length of 18 600 +/- 1300 g mol-1 nm-1. Combining these results with the molecular weight of Pf3 DNA yields a number of protein subunits of 2500 +/- 160 and 2.38 +/- 0.14 nucleotides/protein subunit. Sedimentation coefficient and density increment values of Xf virus when combined with a value for the Xf translational diffusion coefficient [Chen, F. C., Koopmans, G., Wiseman, R. L., Day, L. A., & Swinney, H. L. (1980) Biochemistry 19, 1373] yield a molecular weight of (17.9 +/- 1.0) x 10(6) g mol-1, a number of protein subunits of 3590 +/- 230, 2.07 +/- 0.15 nucleotides/protein subunit, and a mass per length of 18 300 +/- 1200 g mol-1 nm-1. Thus, despite major differences in the DNA-protein packing between these viruses, as well as fd virus, the mass per lengths are surprisingly similar.

Bacteriophages↗
PubMed1982

Intestinal spirochaetosis: an electron microscopic study of an unusual case.

An unusual case of intestinal spirochaetosis is described. The rectum of a 34-year-old male, suffering from Crohn's disease and ankylosing spondylitis, was heavily infested by spirochaetes. Both absorptive and goblet cells were colonized. Spirochaetes were found not only on the luminal surface of these cells, but also within the cytoplasm, in occasional macrophages within the lamina propria and, even more surprisingly, within the occasional Schwann cell. The significance of these findings is discussed.

Adult↗