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Antiserum to leucokinin I, a neuropeptide originally isolated from the cockroach Leucophaea maderae , was used for immunocytochemical labeling of neurons in the brain and ventral ganglia of the moth Spodoptera litura during postembryonic development. In the ventral ganglia, leucokinin-like...
In previous studies we have shown that injection of the insect growth regulator Azadirachtin (AZA) into young vitellogenic females induces inhibition of vitellogenesis in a dose-dependent manner. Juvenile hormone treatment rescues vitellogenin synthesis and ovarian growth. The cytopathological...
The fine structure of coeloconic sensilla of Bombyx mori was studied in cryofixed specimens. These sensilla belong to the category of double-walled wall-pore sensilla. The pegs are ∼10 μm long, located in pits on the dorsal side of the antennal branches, and longitudinally grooved in their...
We investigated the chronic effects of luteinizing hormone (LH) treatment on adult rat Leydig cell structure and function. Two groups of sexually mature male Sprague-Dawley rats were used; controls and rats implanted subdermally with LH-filled Alzet miniosmotic pumps (delivers 24 μg of LH per...
Three syncytial gland types (la, lb and II) have been described in the skin of larval, juvenile and adult Phyllomedusa hypochondrialis , which share the ultrastructural traits common to the serous secretory units of anuran skin, although each manufactures a peculiar product. Type la secretion...
The localization of pericyte-like cells in adult human vascular bed was studied immunocytochemically using anti-pericyte antibody — 3G5. In large-, medium- and small-size arteries, pericyte-like cells were identified in the inner intimal layer, predominantly in the subendothelium, in the outer...
In order to solve the problem of whether the Acoela have a brain of a common flatworm type, an immunocytochemical study was performed of the pattern of FMRF-amide in the nervous system of four species of Acoela, Anaperus biaculeatus, Childia groenlandica, Actinoposthia beklemischevi and...
Light and transmission electron microscopy were used to monitor changes due to the degradation of the old exoskeleton and related events in the sclerites, articular membranes, and gills of two decapod crustaceans ( Carcinus maenas and Macropipus puber ) during pre-ecdysis. In both sclerites and...
Collagen fibrils isolated from sternal cartilage of chick embryo and chondrocranium of cuttle-fish ( Sepia officinalis ) were examined with the electron microscope after rotary shadowing. The aim was to determine whether collagen fibrils from S. officinalis cartilage contained collagen molecules...
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