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Operculum - Seed Appendages
The term operculum is applied to a plug-like structure formed in the micropylar portion of the seed by proliferation of cells at the tip of the inner integument or the nucellus. An operculum has been observed in seeds of many monocotyledonous families, such as the Commelinaceae, Musaceae, Lemnaceae and Zingiberaceae, and a few dicotyledonous families like Bignoniaceae and Nymphaeaceae.
In Lemna paucicostata, cells at the tip of the inner integument undergo a remarkable expansion after fertilization and form a dome-shaped, stopper- like operculum. Cells of the operculum are thick-walled and contain an orange-red substance. During germination of the embryo the operculum becomes detached from rest of the seed and facilitates emergence of the embryo.
Regulation of Glycogenesis Glycogen synthase, the key enzyme in glycogenesis, is activated by insulin and glucose and inhibited by CAMP.
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Q. Do the -H groups bound to the central carbons participate in the peptide bond? The central carbons themselves, the -R groups and the hydrogen attached to the central carbons
Organisational Behaviour of Health Care The insights provided by the theories of organisational behaviour emphasise the need for the establishment of institutional frameworks
respiration.
Explain about Cyanocobalamin Cyanocobalamin occurs as dark red crystals or as a crystalline hygroscopic powder of the same colour without odour and taste. Upon standing in the
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Chest Drainage Tubes (24-72 hours) Continue milking of chest tube hourly. Monitor the amount, colour and record on the flow chart. Assess dressing for any soak
Biological Adaptation These adaptations depend on the geology and basic fertility of the region and some of the mechanisms that are especially well developed in tropical rain
Locomotor Organelles The protozoan locomotor organelle may be Flagella, Cilia or Pseudopodia. These are of considerable value in classification of protozo
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