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Biomedical subjects

J Madison

Publications and source records attributed to J Madison.

At least 19 recordsLinked to original sources
PubMed2001

Sexual harassment in healthcare: classification of harassers and rationalizations of sex-based harassment behavior.

This study identified how 16 Australian registered nurses classified sex-based harassers and explained their own behavior and the behavior of the harasser. A qualitative research design, relying on in-depth interviews, was used to collect the data. The study found that harassment is linked to gender roles and that the harassed are reluctant to blame the harasser--the harassed had "sound" rationalizations for harassment. Awareness of the interactional dynamics of self-blame and these rationalizations will help nurse executives ensure a harassment-free workplace.

Adult↗
PubMed2000

Development of the mizes anorectic cognitions questionnaire-revised: psychometric properties and factor structure in a large sample of eating disorder patients.

OBJECTIVE: This project was designed to develop and test the psychometric properties and factor structure of a revision of the Mizes Anorectic Cognitions questionnaire (MAC). The goals of the revision were to improve the reliability and discriminant validity of the Weight and Approval subscale and to equalize the length of the three subscales. Also, the study compared the original MAC and the MAC-R in terms of their psychometric properties. METHOD: Twenty-four new items were developed for potential inclusion in the MAC-R, in addition to the original 33 items of the MAC. These items were administered to 205 eating disorder patients from five eating disorder clinics or programs, including inpatient, outpatient, and residential treatment settings that served diverse patient populations. Additionally, other measures of eating disorder constructs were administered to assess construct validity. RESULTS: Factor analysis of the large pool of items and item reduction resulted in the final 24-item MAC-R, each subscale being eight items in length. Results showed that the MAC-R highly correlated with the MAC and other eating disorder questionnaires. Reliability of the MAC-R was improved over that of the MAC. Two subscales of the MAC-R discriminated among diagnostic groups, whereas the original MAC did not, indicating improved sensitivity of the revised scale. DISCUSSION: The MAC-R appears to be an improvement over the original MAC. It provides useful information on the cognitions of eating-disordered patients and merits further investigation into its psychometric properties.

Adult↗
PubMed2000

Recognizing and labeling sex-based and sexual harassment in the health care workplace.

PURPOSE: To explore how registered nurses (RNs) recognized and labeled incidents of sex-based and sexual harassment in the Australian health care workplace. DESIGN: Qualitative, using 16 unstructured interviews with registered nurses in Australia. METHODS: Verbatim transcripts were analyzed largely by inductive analysis. Key categories were identified as themes or concepts for analysis. FINDINGS: RNs reported several indicators of sexual harassment, including the invasion of space, confirmation from others, lack of respect, the deliberate nature of the behavior, perceived power or control, overly friendly behavior, and a sexualized workplace. RNs rarely labeled harassing behaviors as sex-based or sexual harassment. CONCLUSIONS: Many forces reduce the likelihood that RNs will correctly recognize and label unwelcome sexualized behavior as sexual harassment. Recognition is associated with a variety of workplace behaviors that sometimes precede harassment. Implications for the health care workplace are discussed.

Australia↗
PubMed2000

Australian Aboriginal trainee health service management program: a new initiative.

This paper explores the development, implementation and evaluation of the Australian Aboriginal trainee health service management program in New South Wales. In 1997, the two-year pilot program commenced with ten trainees. The program consisted of a combination of work-based placements, formal university education and Australian College of Health Service Executives (ACHSE) professional development sessions. The program has allowed trainees to gain professional skills and knowledge and broader work experience, in order to increase their employment opportunities throughout the Australian health care system.

Clinical Competence↗
PubMed1998

Structural characterization of three genetic variants of human serum albumin modified in subdomains IIB and IIIA.

Three new genetic variants of human serum albumin have been detected in Italy by routine clinical electrophoresis. Albumin Milano Slow is common in Northern Italy, while albumins Liprizzi and Trieste, which are fast migrating, are rare and local variants. Isoelectric focusing analysis of the CNBr fragments obtained from the carboxymethylated alloalbumins in all cases localized the mutation to fragment CB5 (residues 330-446). The modified CNBr fragments were isolated on a preparative scale and subjected to tryptic digestion. Sequence determination of the abnormal tryptic peptides revealed that all the variants are caused by single point mutations: Trieste, Lys359-->Asn, Milano Slow, Asp375-->His, and Liprizzi, Arg410-->Cys. These results were confirmed by sequence determination of a variant V8 peptide in the case of Trieste, and by DNA sequence analysis for the other two variants. The DNA analysis showed a G-->C transversion at nucleotide position 11969 for albumin Milano Slow, and a C-->T transition at position 13251 for Liprizzi. The latter represents a mutation at a hypermutable CpG dinucleotide site. Albumins Trieste and Milano Slow, as most of the variants thus far described, have mutations involving residues on the surface of the molecule. In contrast, albumin Liprizzi represents the first example of a mutation in the most active binding pocket of the molecule, placed in subdomain IIIA.

Amino Acid Sequence↗
PubMed1997

Structural characterization of four genetic variants of human serum albumin associated with alloalbuminemia in Italy.

A long-term electrophoretic survey on plasma proteins, which was carried out in several clinical laboratories in Italy, identified 28 different genetic variants of human serum albumin and four cases of analbuminemia. We have previously characterized 16 point mutations, 3 C-terminal mutants, and the genetic defects in two analbuminemic subjects. Here, we report the molecular defects of four alloalbumins that have been characterized by protein structural analysis. Of these, three represent new single-point mutations: albumins Tregasio, Val122-->Glu, Bergamo, Asp314-->Gly, and Maddaloni, Val533-->Met. The fourth, albumin Besana Brianza, has the same Asp494-->Asn mutation that introduces a glycosylation site which has been previously reported in a variant from New Zealand, albumin Casebrook. However, in contrast to albumin Casebrook, albumin Besana Brianza is only partially glycosylated and the oligosaccharide is heterogeneous, consisting of a biantennary complex type N-glycan with either two or one sialic acid residue(s) on the antennae. Both albumin Maddaloni and Besana Brianza represent mutations at hypermutable CpG dinucleotide sites; albumin Maddaloni is a mutant that does not involve a charged amino acid.

Amino Acid Sequence↗
PubMed1997

EGL-36 Shaw channels regulate C. elegans egg-laying muscle activity.

The C. elegans egl-36 gene encodes a Shaw-type potassium channel that regulates egg-laying behavior. Gain of function [egl-36(gf)] and dominant negative [egl-36(dn)] mutations in egl-36 cause reciprocal defects in egg laying. An egl-36::gfp reporter is expressed in the egg-laying muscles and in a few other tissues. Expression of an egl-36(gf) cDNA in the egg-laying muscles causes behavioral defects similar to those observed in egl-36(gf) mutants. Gain of function EGL-36 subunits form channels that are active at more negative potentials than wild-type channels. The egl-36(gf) alleles correspond to missense mutations in an amino terminal subunit assembly domain (E138K) and in the S6 transmembrane domain (P435S), neither of which were previously implicated in the voltage dependence of channel activation. Altogether, these results suggest that EGL-36 channels regulate the excitability of the egg-laying muscles.

Animals↗
PubMed1997

Australian registered nurses describe the health care workplace and its responsiveness to sexual harassment: an empirical study.

This report is a summary of findings from a 1995 study of Australian registered nurses and their perceptions of their health care workplaces, especially as it relates to sexual harassment. There is little Australian-based empirical research available to guide hospitals and health care facilities in developing appropriate policies regarding sexual harassment. Additionally, hospitals have few assessment tools at their disposal to determine if policies and procedures are well known and effective. As the major employer of registered nurses, hospitals and health care facilities need to be concerned about employees' perceptions of the workplace.

Female↗
PubMed1996

Australian registered nurses and sex-based harassment in the health care industry.

This paper discusses sex-based harassment in the nursing profession in Australia. The paper generates industry-specific hypotheses which may provide insights into sex-based harassment in the Australian context. A good understanding of sex-based harassment in health care is essential for reducing and eliminating the problem and its toxic sequelae.

Australia↗
PubMed1995

Structural study of the glycosylated and unglycosylated forms of a genetic variant of human serum albumin (63 Asp-->Asn).

A genetic variant of human serum albumin (alloalbumin) exhibited atypical electrophoretic mobility and chromatographic behavior apparently because of the effect of a point substitution on the molecular conformation. Three forms of albumin were isolated by DEAE HPLC chromatography: normal albumin, and two variant forms V1 and V2. The point substitution (Asp-63-->Asn) generated a canonical tripeptide acceptor sequence for glycosylation with an N-linked oligosaccharide (Asn-Lys-Ser). Neuraminidase digestion followed by electrophoresis showed that the V2 variant form was glycosylated and the V1 form was not. Time-of-flight mass spectrometry yielded a molecular weight of about 2000 for the carbohydrate. Structural analysis of the carbohydrate was done by chromatographic comparison of the pyridylaminated derivatives with standards and was confirmed by proton NMR of the three pronase glycopeptides and of the pyridylaminated oligosaccharide. The oligosaccharide had a complex biantennary structure with two sialic acid residues. In normal albumin Asp-63 is exposed and is adjacent to the first disulfide bond, Cys-62-->Cys-53. The apparent effect on molecular conformation resulting in incomplete glycosylation and atypical electrophoretic mobility suggests that glycosylation may interfere with disulfide bond formation at this site.

Amino Acid Sequence↗
PubMed1995

A genetic variant of albumin (albumin Asola; Tyr140-->Cys) with no free -SH group but with an additional disulfide bridge.

A slow migrating variant of human serum albumin, present in lower amount than the normal protein, has been detected by routine clinical electrophoresis at pH 8.6 in two members of a family living in Asola (Lombardia, Italy). Ion-exchange chromatography of serum samples failed to separate the normal protein from the variant. Analysis of the albumin peak by SDS/PAGE revealed that the variant had a lower apparent molecular mass than its normal counterpart. However, the abnormal band was not detectable when the separation was performed under reducing conditions or when both albumins were carboxymethylated. Isoelectric-focusing analysis of CNBr fragments localized the mutation to fragment CNBr 3 (residues 124-298). This fragment was isolated on a preparative scale and subjected to tryptic digestion. Sequence determination of the abnormal tryptic peptide revealed that the variant arises from a Tyr140--> Cys substitution. This result was confirmed by DNA sequence analysis, which showed a single transition of TAT-->TGT at nucleotide position 5074. Despite the presence of an additional cysteine residue, several lines of evidence indicated that albumin Asola has no free -SH group; therefore, we propose the formation of a new S-S bond between Cys140 and Cys34, the only free sulphydryl group present in the normal protein. The relatively low level of the variant in serum and its abnormal mobility on cellulose acetate electrophoresis and SDS/PAGE are probably caused by a gross conformational change of the molecule induced by the new S-S bridge.

Amino Acid Sequence↗
PubMed1995

Ontogeny and ultradian rhythms of adrenocorticotropin and cortisol in the late-gestation fetal horse.

Fetal maturation and the timing of parturition in both sheep and primates are thought to be controlled by the hypothalamic-pituitary-adrenal axis but little is known about the endocrinology of the equine fetus. We investigated the ontogeny of plasma concentrations of adrenocorticotropic hormone (ACTH), cortisol and corticosteroid binding capacity in the late-gestation fetal horse. We also wished to determine whether there is ultradian rhythmic release of ACTH and cortisol in fetal horses and we compared fetuses to maternal and non-pregnant adult horses. Six fetuses, 278-304 days gestation (term approximately 335), were catheterized and sampled daily until delivery. Mean (+/- S.E.M.) ACTH concentrations increased significantly from 159 +/- 21 to 246 +/- 42 pg/ml over the last 2 days before parturition. Fetal cortisol increased significantly from 3.1 +/- 1.0 to 13.4 +/- 3.7 ng/ml (mean +/- S.E.M.) over the last 9 days before delivery. The slope of regressions for ACTH and cortisol concentrations with respect to time were positive in all subjects and statistically significant in 3 of 6 for ACTH and 5 of 6 for cortisol. Fetal corticosteroid binding capacity declined from 49.5 +/- 20.5 to 16.1 +/- 2.2 ng/ml (mean +/- S.E.M.) over the last 10 days before parturition. However, the greatest changes in ACTH, cortisol and corticosteroid binding capacity occurred very late in gestation, during the last 48 to 72 h before parturition.(ABSTRACT TRUNCATED AT 250 WORDS)

Activity Cycles↗
PubMed1994

Analbuminemia: three cases resulting from different point mutations in the albumin gene.

Analbuminemia is a very rare recessive disorder in which subjects have little or no circulating albumin, although albumin is normally the most abundant plasma protein and has many functions. Analbuminemia is caused by a variety of mutations in the albumin gene and is exhibited only by subjects homozygous for the defect. Previously the mutation had been identified at the molecular level in only two human cases; in one case it resulted from an exon-splicing defect, and in the other case it was caused by a nucleotide insertion that caused a frameshift and premature stop codon. In this investigation we identified the mutations in three unrelated subjects from different countries. In each instance a single-nucleotide mutation produced a stop codon, but the mutations occurred at three different sites: (i) in an Italian male a C-->T transition at nt 2368 in the genomic sequence of albumin, (ii) a C-->T transition at nt 4446 for an American female, and (iii) a G-->A transition at nt 7708 in a Canadian male. The size of the albumin fragment that might have been produced for the three cases varied from 31- to 213-amino acid residues, but no evidence for a circulating albumin fragment was obtained. The paradox is that analbuminemia is extremely rare (frequency < 1 x 10(6)); yet the virtual absence of albumin is tolerable despite its multiple functions.

Adult↗
PubMed1994

Genetic variants of human serum albumin in Italy: point mutants and a carboxyl-terminal variant.

Of the > 50 different genetic variants of human serum albumin (alloalbumins) that have been characterized by amino acid or DNA sequence analysis, almost half have been identified in Italy through a long-term electrophoretic survey of serum. Previously we have reported structural studies of 11 Italian alloalbumins with point mutations, 2 different carboxyl-terminal variants, and 1 case of analbuminemia in an Italian family. This article describes confirmation by DNA sequencing of mutations previously inferred from protein sequencing of 4 of the above alloalbumins; it also reports the mutations identified by protein and DNA sequence analysis of 4 other Italian alloalbumins not previously recorded: albumin Larino, His3-->Tyr; Tradate-2 (protein sequencing only), Lys225-->Gln; Caserta, Lys276-->Asn; and Bazzano, a carboxyl-terminal variant. The first 3 have point mutations that produce a single amino acid substitution, but a nucleotide deletion causes a frameshift and an altered and truncated carboxyl-terminal sequence in albumin Bazzano. In these 4 instances the expression of the alloalbumin is variable, ranging from 10% to 70% of the total albumiN, in contrast to the usual 50% each for the normal and mutant albumin. The distribution of point mutations in the albumin gene is nonrandom; most of the 47 reported point substitutions involve charged amino acid residues on the surface of the molecule that are not concerned with ligand-binding sites.

Amino Acid Sequence↗
PubMed1994

A nucleotide insertion and frameshift cause analbuminemia in an Italian family.

In analbuminemia, a very rare inherited syndrome, subjects produce little or no albumin (1/100th to 1/1000th normal), presumably because of a mutation in the albumin gene; yet, they have only moderate edema and few related symptoms owing to a compensatory increase in other plasma proteins. Because of the virtual absence of albumin the defect must be identified at the DNA level. In this study the mutation causing analbuminemia in an Italian family was investigated by analysis of DNA from a mother and her daughter. The mother was homozygous for the trait and had a serum albumin value of < 0.01 g/dl (about 1/500th normal); the daughter was heterozygous for the trait and had a nearly normal albumin value. Molecular cloning and sequence analysis of DNA from both mother and daughter showed that the mutation is caused by a nucleotide insertion in exon 8; this produces a frameshift leading to a premature stop, seven codons downstream. The methods of heteroduplex hybridization and single-strand conformation polymorphism were used to compare the DNA of the mother and daughter to the DNA of two unrelated analbuminemic individuals (one Italian and one American). This showed that all three analbuminemic individuals had different mutations; these also differed from the mutation in the only human case previously studied at the DNA level, which was a splicing defect affecting the ligation of the exon 6-exon 7 sequences. Thus, analbuminemia may result from a variety of mutations and is genetically heterogeneous.

Amino Acid Sequence↗
PubMed1994

Mentors and preceptors in the nursing profession.

Mentoring and precepting are currently receiving attention in Australian nursing. Studies in private industry and corporate organizations reveal a high correlation between professional success and a positive mentoring experience. Frequently confused with preceptor relationships, mentoring differs in subtle and not-so-subtle ways. This discussion paper aims to identify differences and similarities between the various experiences in an effort to appreciate the contribution such relationships can make to the novice nurse as well as to the mentor or preceptor. Nursing can use the concepts of mentoring and precepting in a variety of ways to facilitate the transition from novice to expert as well as career changes.

Clinical Competence↗