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Biomedical subjects

C C Plato

Publications and source records attributed to C C Plato.

At least 73 records · Page 4Linked to original sources
PubMed1980

Absent d triradius and dotting of the ridges in siblings.

Absent d triradii were found in 2 sibs of a family of African ancestry. 1 of the sibs exhibited not only bilateral absence of d triradius but also bilateral absence of axial triradii. The other sib lacked d triradius in the left palms. All 5 sibs of the sibship showed, to some degree, dotting or dissociation of the ridges. The present results support the suggestion of genetic transmission of both absent d triradius and dotting of the ridges.

Africa↗
PubMed1979

Osteoarthritis of the hand: age-specific joint-digit prevalence rates.

The left hand of each of 903 white males, most of them well-educated professionals, was evaluated for osteoarthritis, in the ongoing Baltimore Longitudinal Study of the Gerontology Research Center. The results of the joint-digit prevalence study indicated that: 1) the prevalence of osteoarthritis varies from one digit to the other; 2) osteoarthritis is considerably more prevalent in the distal than the proximal interphalangeal joints, regardless of digit or age group; 3) this disease is not only more prevalent in the distal interphalangeal joints, but it usually appears in a more severe form in the distal than in the proximal interphalangeal or the metacarpophalangeal joints. 4) Assuming that the presence of osteoarthritis in one joint is independent of the presence of the disease in the other joint of the same digit, there is an excess of digits with osteoarthritis in both the distal and proximal interphalangeal joints. This is suggestive of either a common etiology or that the presence of the disease in one joint enhances the development of osteoarthritis in the other joint of the same digit.

Adolescent↗
PubMed1979

Osteoarthritis of the hand: longitudinal studies.

Evaluation of the osteoarthritic grades of the hands of 478 participants of the ongoing Baltimore Longitudinal Study suggests that: 1) Joint degeneration due to osteoarthritis is a relatively slow process. The maximum rate of degeneration is seen in the distal interphalangeal joints where the average increase is about 1 grade per individual in an interval of 12 to 16 years between visits in each age group. The rate of degeneration in the proximal interphalangeal joints is much lower than that of the distal interphalangeal joints. 2) The progress of the degeneration in the distal interphalangeal joints of an individual (longitudinally evaluated) follows closely that which is observed at the population level (cross-sectional joint-digit study). That is, it is directly related to the age and the interval between visits. This is not always seen in the proximal interphalangeal joint data. 3) The rate of change in the osteoarthritic grade of individual hands agrees closely with that of their distal interphalangeal joints. This further supports the conclusions reached in a first report that what has been referred to as osteoarthritic grade of the hand of an individual may actually be the higher grade among the distal interphalangeal joints.

Adult↗
PubMed1978

Dermatoglyphics and aging.

The objectives of the present study were to compare the frequencies of various dermatoglyphic features among male adults of four different age groups (30-44 years of age, 45-59, 60-74, and 75 years of age and older) and to compare the dermatoglyphic frequencies of a sample of normal 7-year-old males with those of each of the four adult groups. The results indicated that, for the most part, the four adult groups had very similar dermatoglyphic frequencies. The dermatoglyphics of the 7-year-olds were also found to be very similar to those of the 30- to 44-year-old adults; however, they showed, progressively, more significant dermatoglyphic differences as they were compared with succeedingly older age groups.

Adult↗
PubMed1976

Dermatoglyphic investigations in twins and siblings.

The present report describes the preliminary results of an extensive dermatoglyphic investigation among 491 pairs of MZ and DZ twins, and sibs of both sexes. Paired homolateral comparisons were performed for the determination of the degree of discordance for each dermatoglyphic trait and the results were presented in a series of histograms. Some of the outstanding points brought forth by this study are: (1) different dermatoglyphic traits at different digits or palmar areas have different degrees of discordance; (2) in MZ twins the frequency of discordance for each trait is constant regardless of sex or laterality, whereas in DZ twins and sibs both sex and lateral differences are observed; (3) the higher number of significant differences in concordance between the MZ twins vs. sibs than between MZ vs. DZ twins suggests that, at least in the female, the dermatoglyphics may be affected by changing intrauterine environments.

Adolescent↗
PubMed1976

Normal and aberrant palmar creases in twins and siblings.

The present study involving MZ and DZ twin pairs, as well as paired normal sibs, was undertaken to investigate further the genetic involvement in the formation of normal palmar crease patterns, as well as simian and Sydney patterns. Two variations of normal creases were investigated: the thenar type R and the distal type I. Both types cluster in families. The R is more frequent in the females. For both types, MZ twins are more concordant than DZ twins or sibs. Sib studies suggest strong genetic involvement in the development of both the R and I crease types. Parents with simian and/or Sydney creases have more children with these traits than offspring of parents without these traits; however, concordance rate comparisons of MZ or DZ twins and sibs do not suggest strong genetic involvement as in the case of the R and I crease types.

Dermatoglyphics↗
PubMed1975

The dermatoglyphics of American Negroes.

Digital and palmar dermatoglyphics of 184 male and 224 female normal American Negroes were evaluated for digital patterns, digital ridge counts, palmar patterns, palmar main line terminations, accessory triradii and palmar creases. All subjects were seven year olds examined and found free of chronic or other genetic diseases. The results were presented for the left and right hand separately as well as in terms of bilateral symmetry. The present results were for the most part comparable to those of the African and other American Negro groups reported earlier. The distributions of the various dermatoglyphic features among the Negroes taken as a group were compared to those of the other racial groups and their differences were discussed.

Africa↗
PubMed1975

The dermatoglyphics of American Caucasians.

Digital and palmar dermatoglyphics were collected from 360 male and 360 female seven year old Caucasians from the greater Boston area. All participants were screened and found to be free of minor anomalies or chronic diseases. All individuals with I. Q. scores below 70 were also excluded. The results were presented in such a way as to give information on bilateral symmetry as well as overall frequencies of the various dermatoglyphic features. The results were compared with those of the corresponding sample of seven year old normal male and female Negroes of the accompanying report. A review of the distribution of the dermatoglyphic features in different Caucasian populations has also been presented and the overall dermatoglyphics of the Caucasians were discussed in reference to the distribution of the same features in the other major "racial" groups. The method of collection and selection of the subjects, described in the text, makes this set of data unique and one of the most suitable for use as controls in studying the dermatoglyphics of the individuals with diseases or congenital anomalies.

Black or African American↗
PubMed1975

The dermatoglyphics of the Elema people from the Gulf District of Papua New Guinea.

The present report deals with the digital and palmar dermatoglyphics of the Elema peoples from the Gulf District of Papua New Guinea. The samples involved 91 males and 134 females from the areas of Iokea, Sepoe and Karama. The Elema dermatoglyphics, compared to those of other peoples in New Guinea, were found to have a high pattern intensity index and frequency of whorls, and the highest frequency of ulnar type C line, complete simian creases and patterns in the IV interdigital areas of the palms. On the other hand, their 11/7 ratio of the D line, the main line index, and the frequencies of patterns in the hypothenar, thenar/I and II interdigital areas were lower than most other groups on the island; they also have the lowest R/U ratio. All dermatoglyphic features considered, the frequencies in the Elema group were for the most part found to be near the extremes of the range of the dermatoglyphic frequency distributions in New Guinea populations. The dermatoglyphic distributions of New Guinea as a whole are discussed in terms of those of the other Australian populations with comments on the dermatoglyphic comparisons between the Australasians and the other major human groups, Amerindians, Orientals, Asian Indian, Caucasians and Negroes.

Asian People↗