Browsing by Author "M. Yashpal"

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Glycoproteins in the Buccal Epithelium of a Carp, Cirrhinus mrigala (Pisces, Cyprinidae): A Histochemical Profile
(2014) M. Yashpal; U. Kumari; S. Mittal; A.K. Mittal
Glycoproteins (GPs) were visualized histochemically in the secretory cells - the mucous goblet cells (the type A and the type B), the rodlet cells and the epithelial cells in different regions of the buccal cavity of Cirrhinus mrigala. The type A mucous goblet cells, the type B mucous goblet cells, the rodlet cells and the epithelial cells elaborate GPs with oxidizable vicinal diols and GPs with sialic acid residue without O-acyl substitution. The type A mucous goblet cells, in addition, contain moderate amounts of GPs with O-sulphate esters. The type B mucous goblet cells, in contrast, contain high concentrations of GPs with O-sulphate esters. The rodlet cells secrete small amounts of GPs with oxidizable vicinal diols. The analysis of the results elucidates interesting differences in the composition and concentration of GPs in the mucus elaborated by the secretory cells indicating the potential importance of the glycoproteins in the buccal cavity. These GPs could be considered to represent a mechanism for modulation of the composition of the protective mucus layer correlated to specific functions. © 2013 Blackwell Verlag GmbH.
Occurrence of keratinization in the structures associated with lips of a hill stream fish Garra lamta (Hamilton) (Cyprinidae, Cypriniformes)
(Blackwell Publishing Ltd, 2004) Pinky; S. Mittal; M. Yashpal; J. Ojha; A.K. Mittal
Keratinized regions were found to occur in the rostral cap, adhesive pad and horny jaw sheaths associated with the lips of Garra lamta, which inhabits fast flowing turbulent hill streams. In these structures, the surface epithelial cells were modified into characteristic keratinized spine-like or columnar tooth-like unculi, which would provide firm anchorage for the fish on the substratum and assist the fish in browsing or scraping food materials from it. © 2004 The Fisheries Society of the British Isles.
Surface ultrastructure of gill arches and gill rakers in relation to feeding of an Indian major carp, Cirrhinus mrigala
(Elsevier Ltd, 2009) U. Kumari; M. Yashpal; S. Mittal; A.K. Mittal
The surface ultrastructure of the gill arches and the gill rakers of an herbivorous fish, Cirrhinus mrigala was investigated by scanning electron microscopy. These structures show significant adaptive modifications associated with the food and feeding ecology of the fish. Closely lying short gill rakers and narrow inter-raker channels on the gill arches are associated to filter and retain food particles. Prominent epithelial protuberances on the gill rakers and the gill arches enable the taste buds, located at their summit, to project well above the surface of the epithelium. This could increase the efficiency of the taste buds in selective sorting of palatable food. Surface specializations of the postlingual organ are recognized adaptive modifications for selecting, trapping or holding food particles. Prominent molariform teeth born on the lower pharyngeal jaw, and the chewing pad opposite it, are associated to work together as an efficient pharyngeal mill. Mucous goblet cells are considered to elaborate mucus secretions to trap, glue and lubricate food particles for their smooth transport for swallowing. © 2009 Elsevier Ltd. All rights reserved.