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Biomedical subjects

A M Mason

Publications and source records attributed to A M Mason.

At least 19 recordsLinked to original sources
PubMed2001

Use of the intubating laryngeal mask airway in pre-hospital care: a case report.

In trauma management, the importance of early and effective control of the airway is acknowledged universally. Attention to the airway is particularly vital when a casualty has sustained serious head or facial injuries. A cuffed tracheal tube has generally been regarded as the airway adjunct of choice in such cases. However, the attempted insertion of a tracheal tube under direct laryngoscopy is associated with a number of practical problems in pre-hospital trauma care. A case is described in which the intubating laryngeal mask airway (ILMA or LMA-Fastrach) was used successfully in the pre-hospital setting to secure the airway of a patient who had sustained serious head and facial injuries in a road traffic collision. The indications for the use of the ILMA in pre-hospital care are discussed.

Craniocerebral Trauma↗
PubMed2000

Design and synthesis of pyrrolidine-5,5-trans-lactams (5-oxo-hexahydro-pyrrolo[3,2-b]pyrroles) as novel mechanism-based inhibitors of human cytomegalovirus protease. 1. The alpha-methyl-trans-lactam template.

Mechanism-based inhibitors of human cytomegalovirus (HCMV) protease have been designed based on the pyrrolidine-5,5-trans-lactam ring system. New routes to the beta-methyl-, desmethyl-, and alpha-methyl-pyrrolidine-5,5-trans-lactam templates have been developed from 2,4-diaminobutyric acid. ESI/MS studies have shown that these inhibitors can bind covalently and reversibly to the viral enzyme in a time-dependent manner by a mechanism which is consistent with acylation of HCMV deltaAla protease at the active site nucleophile Ser 132. SAR in this series of pyrrolidine-5, 5-trans-lactams has defined the relative stereochemisty of the methyl substituent adjacent to the lactam carbonyl, the functionality on the lactam nitrogen, and the mechanism of action of this novel series of serine protease inhibitors against the HCMV deltaAla protease. Activity decreases on moving from the alpha-methyl to the desmethyl to the beta-methyl series. This selectivity is the opposite of that observed for these templates against the elastase and thrombin enzymes. The activity against HCMV deltaAla protease is the greatest with inhibitors based on the Cbz-protected alpha-methyl-5,5-trans-lactam template which have low micromolar activity against the viral enzyme.

Cytomegalovirus↗
PubMed1996

Mobile mammography: results of a national survey.

PURPOSE: to learn about mobile mammography in the United States. MATERIALS AND METHODS: A survey of 82 questions was designed, pilot tested, and sent to mobile mammography facilities. The questions addressed many aspects of mobile programs, including administrative, financial, equipment, personnel, film processing, quality assurance, and communication of results. RESULTS: Of the 367 facilities that were mailed surveys, 159 facilities completed the survey, and 30 (19%) of those had discontinued their mobile programs. Seventy-six of 158 (48%) mobile facilities had performed mobile mammography for 1-5 years, and 69 of 158 (44%) had performed mobile mammography for more than 5 years. Seventy-two of 156 (46%) facilities were hospital-owned, and 25 of 156 (16%) were radiologist-owned. One hundred seven of 159 (67%) mobile facilities performed screening only. One hundred fourteen of 152 (75%) facilities charged +80.00 or less for screening. Mobile facilities averaged 20 examinations per day and served diverse populations. Sixty-seven of 159 (42%) facilities accepted self-referred women. Thirty-one percent of the facilities performed on-board processing. Only 71 of 149 (47%) facilities were financially profitable or breaking even, but 112 of 154 (73%) facilities would undertake a mobile project again. CONCLUSION: Mobile programs provide an opportunity to increase access to screening mammography, but they face many obstacles.

Data Collection↗
PubMed1989

A "zinc-finger"-type binding domain in tobacco streak virus coat protein.

Tobacco streak virus (TSV) RNA and alfalfa mosaic virus (AIMV) RNA will replicate only if a few copies of their coat proteins are bound to the RNA. To understand this phenomenon experiments were performed to find unique features of the TSV and AIMV subunits. Atomic absorption analysis showed that TSV and AIMV contained substantial quantities of zinc in native virions (approximately one zinc atom per four protein subunits in TSV and one zinc atom per two protein subunits in AIMV), while other plant viruses tested did not. Treatment of TSV with a zinc-extracting reagent resulted in partial degradation of all the TSV nucleoprotein components, although the top component was most effected. The sequence (Cys X2 Cys X10 Cys X2 His) was found between residues 28 and 45 in the TSV primary structure and it is similar to a sequence found in several nucleic acid-binding, gene-regulatory proteins, most notably transcription factor IIIA from Xenopus laevis. TSV subunits were found to be extensively crosslinked within the virions. TSV and AIMV contain sequences rich in basic residues in the amino-terminal portion of the subunit (residues 51 to 72 in TSV and 1 to 26 in AIMV) and helical predictions suggested modes of protein-nucleic acid interactions in these regions similar to those proposed for histones. Two potential sites for glycosylation were identified near the amino terminus of the TSV sequence. Controlled treatment of TSV with trypsin removed 87 residues from the amino terminus and produced a monomer of cleaved protein, as analysed by SDS-PAGE.(ABSTRACT TRUNCATED AT 250 WORDS)

Amino Acid Sequence↗
PubMed1974

Use of intravenous urography.

Studies on 1,476 intravenous urographic examinations done in a 15-month period showed that the proportion of abnormal results varied widely-from 20% in patients with abdominal pain other than renal colic to 92% of those in prostatism. Patients with the strongest clinical evidence of haematuria were the most likely to have abnormal urograms, and to undergo cystoscopy with abnormal findings on this examination. All six patients with renal hypertension showed abnormalities other than on the urogram. Prior use of other tests may increase the effectiveness of urography.

Abdomen, Acute↗
PubMed1974

Self-administered clinical questionnaire for outpatients.

A self-administered questionnaire designed for prerecording the routine clinical information required from outpatients has been found to be acceptable to them. Such a questionnaire should greatly ease the collection and recording of basic clinical information and offer the doctor more effective use of his time. With the questionnaire more information was recorded and therefore available in the case notes than at a conventional doctor-patient consultation. No administrative problems occurred in its distribution, use, and return.

Aged↗
PubMed1971

Multiple immunological abnormalities in a family.

The family of a woman with multiple autoimmune diseases has been investigated. Clinical evidence of an autoimmune disorder was detected in two relatives, and five others had serological and immunoglobulin abnormalities. It is suggested that there is an inherited predisposition to develop immunological abnormalities, and that a number of associated autoimmune diseases may develop in families in which this occurs.

Adult↗
PubMed1970

Fibrosing alveolitis associated with renal tubular acidosis.

The discovery of a case of renal tubular acidosis and fibrosing alveolitis led to the investigation of 19 further patients. Abnormal pulmonary function tests were found in a further four patients with overt renal tubular acidosis and in four out of eight patients with "incomplete" renal tubular acidosis. The response to an ammonium chloride test in seven patients with cryptogenic fibrosing alveolitis was normal. Those patients with a defect of both renal acidification and pulmonary gas transfer had concurrent autoimmune diseases such as Sjögren's syndrome and primary biliary cirrhosis. It is suggested that the renal and pulmonary abnormalities may be part of a systemic disorder capable of affecting many organs. Moreover, hyperglobulinaemia and autoantibodies in these patients further suggests that immunological mechanisms are concerned in the pathogenesis of these abnormalities.

Acidosis, Renal Tubular↗
PubMed1970

"Sicca complex" in liver disease.

Sixty-three patients with liver disease were studied for the presence of the components of Sjögren's syndrome. The "sicca complex" (that is, patients without arthritis) was detected in 42% of patients with active chronic hepatitis, 72% with primary biliary cirrhosis, and 38% with cryptogenic cirrhosis. One patient with active chronic hepatitis and one with primary biliary cirrhosis had rheumatoid arthritis. No evidence of Sjögren's syndrome was detected in seven patients with alcoholic cirrhosis. It is suggested that the sicca complex and autoimmune liver disease may be part of a systemic disorder in which immunological mechanisms are concerned in the pathogenesis.

Adult↗