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Define Principle of fehling test - reduction tests?
Sugars that possess a free or potentially free (those that can be converted to free) aldehyde or ketonic group have a property of easily reducing metal ions such as copper, iron, mercury, bismuth etc. The alkali from Fehling's reagent acts on sugar molecules and converts them to enediols. These enediols are unstable and highly reactive and thus reduce cupric ions to cuprous ions. These cuprous ions combine with the hydroxyl ions to form cuprous hydroxide, which, on heating, forms a red precipitate of cuprous oxide.
Latitudinal Variations The latitudinal variation of temperature over the earth is the result of two main variables incoming solar radiation and the distribution of lan
Place a slide of Amoeba (common species is A. proteus) under tlie lnicroscope and focus it under low power (5x x 5x), and observe it carefully. Amoeba looks like an irregular colou
What is the meaning of Oedema? In some pathological conditions the body is in a positive water balance; that is the intake of fluids is greater than the excretion, and the pati
Q. What are the hormones secreted by the thyroid gland? What are their functions? The thyroid secretes the triiodothyronine (T3), hormones thyroxine (T4) and calcitonin. T3
Applications of Biotin Biotin is mainly used in the preparation of injection, and also in the manufacture of vitamin B complex and multi-vitamin preparations. It is used in
Q. Preparation of the Laboratory Samples From the primary sample while selecting a representative laboratory sample, we need to consider the following: a) Laboratory sampl
From an ecological point of view, species richness alone has limited value. More meaningful measures use the number of different species in a given area (species richness) as well
Characteristics of phylum porifera
How does the structure of a chloroplast enable it to build up a concentration gradient of protons? Chloroplasts have an inner membrane system having of thylakoids. The pumpin
Plant Responses to Light-Dark Cycles Based on their requirement for day length (number of hours of light) for flowering plants have been grouped under three major categories,
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