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Galvanotaxis - Modes of Cell Movement
Galvanotaxis considers to the movement of cells in response to a potential variation between cells. It is suggested that there are voltage differences among embryonic regions that could play an important role in morphogenesis. Minute electric fields of the order of 10 to 100 mv/mm appear to be enough to alter the direction of nerve growth. Nuccitelli and Erickson (1984) displayed that embryonic chick fibroblasts migrate toward negative pole when cultured in small steady electrical field. Early chick embryos, regenerating blastema of amphibians and moth ovaries while transportation of yolk proteins occurs, arc some of the structures where large electric currents have been detected.
Wind pollinated flowers are: 1. Small, brightly coloured, producing large number of pollen grains 2. Small, producing large number of dry pollen grains 3. Large producing
Explain the Polycarbonate Nucleopore Filtre? A given sample is filtered through a membrane filter, usually polycarbonate nucleopore filter with a pore size that will retain bac
On living organism Air pollution causes following effects on living organism: (a) Effects on humans: 1. Carbon monoxide reduces the oxygen carrying cap
Measuring ecosystem diversity is not easy, and ther e is no definite index for its measurement. It is generally assessed by the measure of species diversity in an ecosystem, often
Explain the Small Intestine? The small intestine is made up of three sections, the duodenum, the jejunum, and the ileum. Bile from the liver and pancreatic enzymes are released
Q. Explain Intraoral Barrier Techniques? Rubber dam A rubber dam is used whenever possible for improved vision and access and to reduce dental personnels' exposure to micr
List three human activities which could cause the loss of a species. Human activities which threaten species with extinction are: (i) hunting of individual species, (ii) over-
Q. What is the parasite that causes giardiasis? How is it transmitted and what are the typical manifestations of the disease? The Giardiasis is a protozoal infection caused by
Ciliated Protozoan Ciliates form the largest and the most homogenous group of protozoans. They are placed under one phylum Ciliophora and evidence indicates that its members s
what are pathogenic characteristics of protoctista?
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