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Biomedical subjects

J N Miller

Publications and source records attributed to J N Miller.

At least 163 records · Page 9Linked to original sources
PubMed1973

Ultrastructural studies of treponemes: location of axial filaments and some dimensions of Treponema pallidum (Nichols strain), Treponema denticola, and Treponema reiteri.

Ultrathin sections of Treponema pallidum (Nichols strain), T. denticola (microdentium), and T. reiteri have been studied in the electron microscope to determine the location of the axial filaments and some of the dimensions of these organisms. The axial filaments of T. pallidum (Nichols strain) have been seen to be tubular in cross section with an overall diameter of 21.0 +/- 0.73 nm, and an electron-lucent core of 8.0 nm. The filaments were found to lie on the outside of the organism which had only one membranous structure surrounding the protoplasmic core. These findings were in contrast to those obtained for T. denticola and T. reiteri where the axial filaments did not exhibit a hollow core and were located between an outer membrane and an inner membrane surrounding the protoplasmic core. The outside diameter of T. denticola was determined to be 224.9 +/- 2.83 nm, and that of T. reiteri as 331.0 +/- 4.15 nm, contrasting with T. pallidum (Nichols strain) which had a diameter of 163.0 +/- 1.9 nm.

Animals↗
PubMed1971

Intracellular location of Treponema pallidum (Nichols strain) in the rabbit testis.

During investigations designed to obtain purified suspensions of virulent Treponema pallidum (Nichols strain), infected rabbit testicular tissue was routinely examined in the electron microscope. Morphologically typical T. pallidum were found intracellularly within the cytoplasmic substance of fibroblasts, interstitial and Leydig cells, and of spermatocytes. The importance of these observations to latency and treatment is discussed.

Animals↗
PubMed1971

Caisson disease.

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Decompression Sickness↗
PubMed1969

Antigenic structure of Treponema pallidum, Nichols strain. II. Extraction of a polysaccharide antigen with "strain-specific" serological activity.

An ultracentrifugally homogeneous heat-stable polysaccharide preparation free from serologically reactive rabbit testicular tissue antigen, including cardiolipin, was extracted from the Nichols strain of Treponema pallidum, and found to react by complement-fixation with homologous rabbit sera but not with human syphilitic sera. In addition, the reactive "strain-specific" component was found to be distinct from a second reactive component within the preparation related to an antigen of T. reiteri.

Animals↗
PubMed1968

Reduction of nonspecific background staining in the fluorescent treponemal antibody-absorption test.

The nonspecific background fluorescence which occurs with the fluorescent treponemal antibody-absorption test for syphilis was found to result from a reaction between serum-treated Treponema pallidum organisms and the conjugated antihuman gamma-globulin. It was also shown that beta-lipoprotein and albumin were the important contributing factors in human serum. Various dilutions of 2.5% trypsin in phosphate-buffered saline specifically reduced background fluorescence under proper test conditions. By employing a trypsin digestion method, a semiautomated procedure utilizing a visual readout has been postulated as feasible.

Antibodies, Anti-Idiotypic↗
PubMed1968

Shelf life of fluorescent treponemal antibody-absorption test reagents.

Properly prepared, standarized, and stored fluorescent treponemal antibody-absorption (FTA-ABS) reagents have been shown to have stabilities equal to other biological reagents. A liquid antigen over 10 years old has been shown to give a satisfactory reaction. Newer preparations have now been shown to be stable for over 5 years, and the tests on each are being continued. The very new liquid antigens which were originally standardized by the FTA-ABS method have shown no decrease in potency over a 20-month period. Stability studies on antigens dried on slides are now in their eighth month, with no apparent loss in potency. The stability of the conjugate is constant when stored frozen at -20 C or lyophilized. When stored as a liquid at 4 C, the stability is governed by the pH and the molarity of the buffer. The standardized and lyophilized sorbent has been shown to be stable for over 1 year.

Antigens↗