Three homeotic mutants, aristapedia (ssa and ssa-UCl) and Nasobemia (Ns) which involve antenna-leg transformations were analyzed with respect to their time of expression. In particular we studied the question of whether these mutations are expressed when the mutant cells pass through additional cell divisions in culture. Mutant antennal discs were cultured in vivo and allowed to duplicate the a...

salivary gland involvement is one of the radioiodine therapy complications. salivary gland scintigraphy in quantitative mode can accurately evaluate salivary gland function. methods: salivary gland scintigraphy was performed with tc-99m pertechnetate, at the time of iodine therapy as a basic study and then 3 weeks and 3 months afterwards. ejection fraction (ef) of parotid and submandibular glan...

neoplasms that arise in the salivary glands are relatively rare, yet they represent a wide variety of both benign and malignant histologic subtypes. approximately 70% of the salivary gland tumors affect parotid gland with the submandibular gland being affected in 5-10% of the cases, sublingual gland in 1% and minor glands in 5-15% of the cases. submandibular gland tumors are relatively rare and...

During the metamorphosis of holometabolous insects, the larval nervous system is restructured to provide the circuitry needed by the developing adult. Prominent new centers in the brain, the antennal lobes, arise to receive olfactory afferent axons from the developing adult antennae and provide an excellent system in which to study the development of synapses in a central nervous system. We hav...

Antennae are among the most elaborate sensory organs in adult flies, and they provide rich information for phylogenic studies. The antennae of five out of eight species of Gasterophilus Leach (G. haemorrhoidalis (Linnaeus), G. intestinalis (De Geer), G. nasalis (Linnaeus), G. nigricornis (Loew) and G. pecorum (Fabricius)), were examined using scanning electron microscopy. The general morphology...

The adult head capsule of Drosophila forms primarily from the eye-antennal imaginal discs. Here, we demonstrate that the head primordium is patterned differently from the discs which give rise to the appendages. We show that the segment polarity genes hedgehog and wingless specify the identities of specific regions of the head capsule. During eye-antennal disc development, hedgehog and wingless...

Abstraet-l . The effects of the amino acid, aspartate, as an allosteric modifier of pyruvate kinase (PK) were surveyed in tissue extracts from 18 species of animals. 2. Aspartate was a strong activator of PK in selected tissues of gastropod and bivalves molluscs, particularly amongst anoxia-tolerant species; with one exception, a polychaete worm, aspartate had no effect on PK from non-molluscan...

5-methylcytosine (5mC) is a key epigenetic mark which influences gene expression and phenotype. In vertebrates, this epigenetic mark is sensitive to Cd exposure, but there is no information linking such an event with changes in global 5mC levels in terrestrial gastropods despite their importance as excellentecotoxicological bioindicators of metal contamination. Therefore, we first evaluated tot...

Glucose is transported in crustacean hepatopancreas and intestine by Na(+)-dependent co-transport, while Na(+)-dependent D-fructose influx has only been described for the hepatopancreas. It is still unclear if the two sugars are independently transported by two distinct cation-dependent co-transporter carrier systems. In this study, lobster (Homarus americanus) hepatopancreas brush border membr...

In Gucheng Lake, Jiangsu Province, China, randomly selected crabs were fed 2 diet types. Crab crude oil methyl ester analysis was performed using gas chromatography-mass spectrometry. Fatty acid compositions in the 3 edible parts of a crab - the hepatopancreas, gonad, and muscle - were analyzed. C16:1 and C18:2 were significantly higher in most commercial pellet feed-feeding crabs than in small...