Biomedical subjects
A Sahni
Publications and source records attributed to A Sahni.
Bile ascites following percentaneous trucut needle liver biopsy.
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Acquired zinc deficiency in an infant resembling acrodermatitis enteropathica.
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Familial congenital hypoplasia of depressor anguli oris muscle with congenital hepatic fibrosis.
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Shigellemia in an infant with intractable diarrhea.
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Incidence of gastrointestinal malignancies in Punjab (ten-year retrospective study 1976-1985).
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Evolutionary aspects of reptilian and mammalian enamel structure.
The evolution of enamel structure is dealt with here on the basis of fossil reptiles and mammals ranging from the Triassic to the present. The evidence suggests that prismatic enamel had developed in some therapsid reptiles and the mammal, Eozostrodon about 180 million years ago. For the next 100 million years, mammalian evolutionary history is sparingly documented and this is reflected in the poor record of enamel evolution during this period. The few Jurassic reptiles and mammals studied suggest a preprismatic structure. In the Late Cretaceous (80 to 65 million years ago) when the fossil record improves, mammalian enamel investigated from North American localities, are found to be prismatic; allotherian (multituberculate) and metatherian (marsupial) enamels are usually tubular, while eutherian (placental) ones are not. Prism structure in Tertiary mammals in general, conforms to that of their present day descendants, but there are discernible exceptions. The record of evolutionary change in Tertiary mammals is obscured by functional modifications related to biomechanical stresses. Enamel structure may be secondarily modified; similar in phylogenetically unrelated groups (eg., pauciserial enamel of early rodents) or dissimilar at the intra-familial level (eg., rodent families Ctenodactylidae and Ischryomyicae). Prismatic enamel is recorded from the tooth of a hatchling of the gavial, Gavialis gangeticus.
The health administrator in India.
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The emerging role of hospitals for health care in India.
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Management of health institutions and manpower utilisation in India.
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Indraloris and Sivaladapis: Miocene adapid primates from the Siwaliks of India and Pakistan.
THE primate family Adapidae underwent a major radiation during the Eocene in Europe(1,2) and North America(3,4). Asian and African Eocene mammalian faunas are still poorly known, but there is sufficient evidence to indicate at least a modest radiation of Eocene adapids in Asia(5,6) and probably also in Africa(2). Apart from possible lemuriform and anthropoid primate derivatives, the family Adapidae was thought to have become extinct at the end of the Eocene (middle Tongrian, approximately 37 Myr (refs 2, 7, 8)). We present here new evidence which indicates that at least two genera of adapid primates, Indraloris and Sivaladapis (gen. nov.), survived into the late Miocene of India and Pakistan. These genera are little advanced over Eocene Adapidae in terms of dental adaptations and are apparently south Asian relicts of a much earlier radiation.