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Biomedical subjects

D Deutsch

Publications and source records attributed to D Deutsch.

At least 55 records · Page 3Linked to original sources
PubMed1987

Changes in mineral distribution and concentration during enamel development in the deciduous human maxillary and mandibular teeth.

The present study describes the detailed changes in mineral concentration in developing human enamel across the different stages of development from early formation to maturation in the human maxillary and mandibular deciduous teeth. The results indicate a stage in the development of enamel in each of the deciduous human teeth in which the tissue becomes porous due to a loss of matrix protein which is subsequently replaced by mineral during the maturation process with the enamel finally becoming fully mineralized and hard. The time of appearance of this porous stage varies in the different deciduous teeth. The importance of this stage with regards to enamel susceptibility to metabolic influences is discussed.

Aging↗
PubMed1987

Changes in amino acid composition and protein distribution during development of human deciduous enamel.

The present study is concerned with the detailed changes in protein composition and protein distribution occurring during enamel development in the human deciduous tooth from early formation till maturation. It demonstrates that enamel development in the human tooth occurs in at least three distinct stages, forming, maturing and mature, which are generally similar to those previously identified and characterized in animal teeth. The changes in amino-acid composition and protein distribution reflect the existence of two classes of proteins, termed amelogenins and enamelins. The results show that the proportions of these two classes of enamel proteins and their constituents vary with the maturity of enamel.

Aging↗
PubMed1987

Pattern of mineral uptake in the developing human deciduous enamel.

The present study describes the detailed changes in mineral concentration in developing human enamel across the different stages of development from early formation to maturation. The results indicate a stage in the development of deciduous human incisor enamel in which the tissue becomes porous because of a loss of matrix protein, which is subsequently replaced by mineral during the maturation process, with the enamel finally becoming fully mineralized and hard. The importance of this stage with regard to enamel susceptibility to metabolic influences is discussed.

Amelogenesis↗
PubMed1986

The perceived height of octave-related complexes.

Subjects were presented with two-part patterns consisting of tones whose partials stood in octave, or near-octave relation. The perceived heights of the tones in the patterns were found to vary depending on their positions along the chroma circle, so that the patterns were perceived quite differently depending on which of two keys they were in. Implications of these findings are discussed.

Humans↗
PubMed1986

[Copious pericardial and pleural effusion of hypothyroid origin. Report of a case and review of the literature].

The authors report the case of a female of 57 years presenting hypothyroidism with pericardial tamponade followed by development of copious pleural extravasation. The present observation and those reported in the literature are used to evoke the characteristics of copious pericardial and pleural extravasation during hypothyroidism. The authors emphasize the importance of cardiac echography during myxedema. A few exceptional observations aside, extravasation is reduced by supplementary hormone therapy.

Echocardiography↗
PubMed1985

Postnatal changes in size, morphology and weight of developing postnatal deciduous anterior teeth.

The present investigation is concerned with the postnatal changes in size, morphology and weight of anterior deciduous teeth (maxillary and mandibular central and lateral incisors and canines) in infants aged 0-46 weeks. Relating tooth weight and height to the age of the infant revealed the time at which each tooth achieves its maximum crown height and root formation begins, the rate of root elongation and, in the case of the canine teeth, the postnatal rate of crown elongation.

Aging↗
PubMed1984

Fracture of the human femoral neck: effect of density of the cancellous core.

Thirty three fresh femora from 18 cadavera were loaded to fracture at a deformation rate of 5 mm/min to study the effect of density of the cancellous core in fracture initiation of the femoral neck. The neck of the femur was modelled as a composite beam subjected to bending and the ultimate strength of the bone at the superior aspect of the neck was calculated from the model, which was fed by the mechanical tests and geometry measurements. The area porosity of the cancellous core was introduced into the beam model after measuring the apparent density of dry fat-free bone for each specimen. The results showed a strong dependence between the ultimate strength obtained and the cancellous bone density, the latter previously measured for each specimen by the non-invasive Compton scattering technique. Area porosity of the femoral neck was found to have little effect on the results obtained, permitting the use of an average value for this parameter in calculating the ultimate strength of the neck of the femur.

Adult↗
PubMed1984

Two issues concerning tonal hierarchies: comment on Castellano, Bharucha, and Krumhansl.

First, because tonal hierarchies exist in the music of long-established traditions, we may assume that they confer certain processing advantages. Such hierarchies capitalize on certain properties of the pitch memory system that do not require a tonal setting for demonstration. Furthermore, they facilitate the generation of hierarchical representations of sequential patterns of pitches, and such representations enable considerable parsimony of encoding. Second, the listener's establishment of a tonal hierarchy involves a process of key attribution. This process draws not only on the identities of the notes presented but also draws on their orderings. Certain sequential grouping factors are involved here that can also be shown to exist outside a tonal setting. We are therefore dealing with an elaborate bootstrapping operation, through which both a key and a sequential representation are arrived at by the listener.

Cognition↗