introduction: this investigation was undertaken to examine chemical nature of glycoconjugate components on the surface of developing rat intestinal cells during gut histogenesis. materials and methods: rat embryos at days 10-12 of gestation was fixed in b4g and processed for lectinhistochemistry. 5m paraffin sections were incubated with 10-15 ?g/ml solution of hrp/lecti ns from arachis hypogaea...

SKELETAL and aortic changes in foetal rats treated with osteolathyrogenic agents via the maternal system throughout pregnancy or very late in pregnancy have been described by Stamler (1955). Developmental changes in Xenopus larvae (Chih, Witschi, & Ponseti, 1954) and in salamander and toad larvae (Levy, 1955) have also been described. The abnormalities produced in these forms by these agents ha...

To analyze the molecular events that occur in the developing mandible, we examined the expression of 8803 genes from samples taken at different time points during rat postnatal mandible development. Total RNA was extracted from the mandibles of 1-day-old, 1-week-old, and 2-week-old rats. Complementary RNA (cRNA) was synthesized from cDNA and biotinylated. Fragmented cRNA was hybridized to RG-U3...

Through S1 nuclease mapping using a specific cDNA probe, we demonstrate that the slow myosin heavy-chain (MHC) gene, characteristic of adult soleus, is expressed in bulk hind limb muscle obtained from the 18-d rat fetus. We support these results by use of a monoclonal antibody (mAb) which is highly specific to the adult slow MHC. Immunoblots of MHC peptide maps show the same peptides, uniquely ...

this paper establishes new support for implementing outward oriented trade policies by relating industrial sector growth, trade policy orientation and export growth in 36 developing countries,including iran using a logistic growth function. based on thisstudy the use of stronglyoutward oriented policies towards export is likly relatedto a faster growth ofthe share of industrial output in gdp as...

Little is known about lung function during early stages of postnatal maturation, although the complex structural changes associated with developing rat lung are well studied. We therefore analyzed corresponding functional (lung volume, respiratory mechanics, intrapulmonary gas mixing, and gas exchange) and structural (alveolar surface area, mean linear intercept length, and alveolar septal thic...

Neocortical slices from young [postnatal day (P) 5-8], juvenile (P14-18), and adult (>P28) rats were exposed to long periods of hypoxia. Field potential (FP) responses to orthodromic synaptic stimulation, the extracellular DC potential, and the extracellular Ca2+ concentration ([Ca2+]o] were measured simultaneously in layers II/III of primary somatosensory cortex. Hypoxia caused a 42 and 55% de...

In 2 studies, a method of linear morphometry was applied to regulatory developmental neurotoxicity studies in the rat. The first study involved the development of the brain during postnatal days (PNDs) 7-63, and the second involved the effects of 8 mg/kg i.p. trimethyltin chloride (TMT) to rats at PND 8, with morphometry performed at PNDs 12 and 24. The results of the TMT linear morphometry wer...