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Biomedical subjects

D L Gardner

Publications and source records attributed to D L Gardner.

At least 109 records · Page 6Linked to original sources
PubMed1976

The preparation of human articular cartilage for scanning electron microscopy.

This paper compares sixteen preparative techniques thought to be of advantage in the study by scanning electron microscopy (SEM) of human articular cartilage surfaces. The adequacy of surface preservation obtained with the techniques, was judged subjectively, first, by the reproducubility of secondary electron images of normal cartilage, and second, by comparing the results with those obtained by reflected light microscopy of the fresh unfixed cartilage surface over a magnification range of X20- X240. Adequate surface preservation was confirmed when cartilage surfaces had been dehydrated through ethanol to propylene oxide and vacuum dried; dehydrated through amyl acetate and quenched in Freon before freeze-drying; dehydrated and passed through amyl acetate at low temperature before freeze drying. Valuable information can be obtained from different specimens by varying the technique of preparation. At different ages, different surface features are best preserved. In a systematic study it has been found essential to adopt a uniform preparative method and to control the results by reflected light microscopy. Even with the most perfect preparation, the surface appearances cannot be identical with those that function under load in vivo.

Adolescent↗
PubMed1975

Development with age of human articular cartilage surface structure. A survey by interference microscopy of the lateral femoral condyle.

The weight-bearing surfaces of the lateral femoral condyles taken from twenty normal human cadavers aged 0-47 years have been examined by reflected light interference microscopy (RLIM) and by scanning electron microscope (SEM). The surfaces appeared normal by naked eye examination. The presence of both 200-400 mum diameter secondary undulations and small ovoid 20-45 mum diameter tertiary hollows was confirmed in all specimens using both techniques. Measurements by RLIM showed that the tertiary hollows increase significantly in depth and diameter with increasing age. A further order of quaternary surface irregularities was shown. Small irregular ridges, 130-275 nm deep and 1-4 mum diameter, were found with increasing frequency on specimens obtained from persons aged 21 years. These quaternary irregularities are thought to be due to exposure of superficial fibre bundles after the loss, with age, of surface ground substance.

Adolescent↗
PubMed1972

Preparation of unfixed undemineralized bone sections: the Bright bone cryostat.

A bone cryostat is described with which cold sections of unfixed, undemineralized calcified tissue can be prepared. The bone cryostat is suitable for the preparation of the sections required for the histochemical and immunofluorescent study of bone, for electron microprobe analysis, and for bone and joint autoradiography with soluble compounds.

Alkaline Phosphatase↗