Search PubMed⌕ Search

Biomedical subjects

D S Goldman

Publications and source records attributed to D S Goldman.

At least 37 records · Page 2Linked to original sources

Care of the young hemophiliac. New socioeconomic demands and the changing patient-physician relationship.

Over the past two decades, greater knowledge about hemophilia and vastly improved treatment have led to a veritable revolution in the care of this crippling disease. In prospect is an era in which both short- and long-term sequelae may be avoided altogether. Much of the progress has been effected through novel methods of care delivery in which the relationship of the physician and his patient begins to resemble more a partnership between equals than the traditional dependency of the chronically handicapped on his doctor. Yet with, and because of, these changes ethical and legal aspects are inevitably introduced, some of which are discussed in the article. These deal with issues of public policy, distributive justice, avoidance of harm, risk imposition and risk-taking, confidentiality, and paternalism. When applicable, the discussion surrounds a prototypical case which illustrates the real dilemmas which treaters and patients may have experienced or may encounter. Following each issue is a discussion intended to show how the ethical and legal dimensions may be analyzed in a way which allows certain justifiable decisions. These analyses are themselves based upon ethical premises which are commonly accepted, legal precedent, or both. While some of these considerations are relevant to the older hemophiliac as well, most deal with topics affecting those most likely to benefit from the advances and to contend with the challenges of this new era of hemophilia care: the young hemophiliac and his physician.

Adolescent↗

Molecular cloning and nucleotide sequence of a transforming gene detected by transfection of chicken B-cell lymphoma DNA.

A transforming gene detected by transfection of chicken B-cell lymphoma DNA has been isolated by molecular cloning. It is homologous to a conserved family of sequences present in normal chicken and human DNAs but is not related to transforming genes of acutely transforming retroviruses. The nucleotide sequence of the cloned transforming gene suggests that it encodes a protein that is partially homologous to the amino terminus of transferrin and related proteins although only about one tenth the size of transferrin.

Animals↗

Histiocytic medullary reticulosis associated with acute Epstein-Barr (EB) virus infection.

A 22-month-old girl developed a rapidly fatal erythrophagocytic syndrome associated with evidence of acute EB viral infection. The association of hemophagocytic syndromes with viral, bacterial, and parasitic infections is discussed. All cases diagnosed as histiocytic medullary reticulosis should include attempts to detect possible association with infectious agents in addition to the assessment of host response.

Acute Disease↗

Longitudinal esophageal bands associated with esophageal aperistalsis: speculations on pathogenesis.

A 6-year-old girl with ataxia telangiectasia syndrome was found to have multiple bands longitudinally traversing her esophagus, and esophageal aperistalsis. In the past, the patient was also known to have had esophageal candidiasis. The bands may have been congenital or may have been produced when linear ulcers caused by fungal esophagitis undermined mucosal strips and then healed, leaving tissue bands attached only at their extremities to the esophageal wall. The esophageal motor dysfunction may have been attributable to esophageal candidiasis, or may have been a hitherto unrecognized component of the ataxia telangiectasia syndrome.

Ataxia Telangiectasia↗

Inhibition of the Synthesis of Wax D Peptidoglycolipid of Mycobacterium tuberculosis by d-Cycloserine.

The antibiotic d-cycloserine inhibits the synthesis of the wax D peptidoglycolipid in cells of the H37Ra strain of Mycobacterium tuberculosis. This inhibition occurs at a lower concentration of the drug than that required for the inhibition of growth. The inhibition is completely reversed by d-alanine. An arabino-galactan-galactosamine-(diaminopimelic acid)-mycolate accumulates in H37Ra cells exposed to the antibiotic. The chemical and functional group analyses of this lipid suggests it to be a possible precursor to the synthesis of wax D.

Journal Article↗

Elongation of fatty acids in Mycobacterium tuberculosis.

Cell-free extracts of the H37Ra strain of Mycobacterium tuberculosis contain a soluble enzyme system which catalyzes an elongation reaction of long-chain fatty acids. The predominant reaction involves the addition of a single C(2) unit to the acceptor fatty acid; the elongation takes place exclusively at the carboxyl end of the acceptor molecule. The endogenous acceptor lipid can be removed by solvent extraction of the enzyme system. The lipid-depleted enzyme can be fully reactivated with external acyl coenzyme A, after which elongation with acetyl coenzyme A takes place. The elongation reaction is avidin-insensitive and does not require adenosine triphosphate. Reduced nicotinamide adenine dinucleotide is the source of reducing equivalent, whereas reduced nicotinamide adenine dinucleotide phosphate is without effect.

Carbon Isotopes↗

Chemical composition of the cell wall of the H37Ra strain of Mycobacterium tuberculosis.

The cell wall of the H37Ra strain of Mycobacterium tuberculosis was isolated and freed of extraneous noncovalently linked material by a series of extraction and enzymatic procedures. Chemical analysis of the cell wall has revealed the following composition: 22.8% amino acids, principally alanine, glutamate, and diaminopimelate in a molar ratio of 1:1.8:0.8; 24.7% reducing sugars, all in the form of arabinose and galactose in a molar ratio of 2.6:1; and 3.95% amino sugars, all in the form of glucosamine, muramic acid, and galactosamine in a molar ratio of 1:6.6:0.8. About 32.1% of the dry weight of the cell wall is lipid, of this about 55% is in the form of two series of mycolic acids. Each series of mycolic acids contains two homologues differing by 28 mass units. One pair of homologues contains in each a carbonyl function and an unsaturated double bond; the other pair contains two cyclopropane groups in each homologue. The remaining lipids are composed principally of normal saturated fatty acids, including tuberculostearic acid.

Alanine↗