Jai Narain Vyas University

About: Jai Narain Vyas University is a education organization based out in Jodhpur, Rajasthan, India. It is known for research contribution in the topics: Dielectric & Murashige and Skoog medium. The organization has 1228 authors who have published 1303 publications receiving 17389 citations. The organization is also known as: University of Jodhpur.

The Alimentary Canal and Digestion in Teleosts

Abstract: Publisher Summary This chapter describes the alimentary canal and digestion in teleosts. It recognizes several types of teleosts on the basis of the different foods taken by them and their feeding habits: plankton feeders, herbivores, omnivores, carnivores, and specialists. The various degrees of specialization in feeding habits lead to the distinction of europhags, stenophags and monophags. Many cell types of the teleost digestive tract have been examined electron-microscopically, such as oral epithelial cells, chloride cells, scattered chemosensory cells, the cells of taste buds, intestinal goblet cells, and epithelium cells. Histo- and cyto-chemical techniques have been used in the study of the teleostean alimentary canal. Because the inner lining of this canal is mucified, emphasis is given to the mucus-secreting cells, which appear to contain either neutral or acidic mucopolysaccharides. In many teleosts, alkaline phosphatase and acid phosphatase activity has been detected in the brush-border of intestinal and cecal epithelia. Feeding rates have been measured by observing food intake under laboratory conditions with restricted or excess rations. The chapter discusses three methods by which the digestion rate in fish is estimated––namely, (1) by measuring the time interval between food intake and defecation, (2) by measuring the stomach contents at various time intervals after feeding, and (3) by using X-rays for observing the progress of digestion with time.

Measurement of Forbidden Energy Gap of Semiconductors by Diffuse Reflectance Technique

Abstract: Diffuse reflectance technique for the measurement of forbidden energy gap, Eg, is discussed. The energy coordinate of the point at which the linear increase in the Kubelka-Munk function starts gives the Eg-value. The Eg-values of fifteen semiconductors are reported. These Eg-values are found to be in good agreement with those measured by other methods. Es wird die Methode der diffusen Reflexion fur die Messung der Breite Eg der verbotenen Zone diskutiert. Der Energiewert des Punktes, an dem der lineare Anstieg der Kubelka-Munk-Funktion beginnt, ergibt den Eg-Wert. Die Eg-Werte fur funfzehn Halbleiter werden mitgeteilt. Diese Eg-Werte befinden sich mit denen, die mit anderen Methoden gemessen wurden, in guter Ubereinstimmung.

Role of Hyperaccumulators in Phytoextraction of Metals From Contaminated Mining Sites: A Review

Abstract: Accumulation of heavy metals in selective locations of the environment has been attracting considerable public attention over the last decades. The conventional clean-up technologies to extract and remove heavy metals from mining sites are either inadequate or too expensive for developing countries. In the past decades, research efforts have been directed toward phytoextraction by using hyperaccumulators as an alternative, low-cost means of extracting heavy metals from the metal contaminated mining sites. Hyperaccumulating plants are used to transport and concentrate metals from soil into the harvestable parts of plants such as roots and aboveground shoots. Such harvestable biomass is ashed so that the ash can be disposed or even better recycled in metal processing industry for biorecovery of precious and semiprecious metals. This is a cost-effective, environmentally friendly, aesthetically pleasing approach most suitable for developing countries. The authors report the characteristics and mechanisms of h...