Practical Exercises in Comparative Physiology And Urine Analysis
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88. Dilute the .saliva with an equal volume of distilled water. Label four test tubes, A, B, C, and D. Into A place some .saliva, boil it and add some starch mucilage. In B and C place starch mucilage and saliva, to B add a few drops of hydrochloric acid and to C some caustic potash.
To D add merely the saliva to the starch mixture.
Place all four in a water bath not exceeding 40° C, and after a time test a small portion of them for .sugar with Fehling's .solution. Reserve a small amount of D. ...Why is no sugar formed in A? In B and C a strong acid and alkali arrest the action of ptyalin. Neutralize a portion of B and C and test again. Is there any result? In D the starch has been converted by the ptyalin into a reducing sugar.
89. Test a portion of D with iodine solution. The ab- sence of any blue color indicates that the starch has disap- peared, having been converted into a reducing sugar — mal- tose. Also test the remainder of A, B and C with the iodine .solution.
90. Test another portion of D withphenyl-hydraziu, (53) crystals of phenyl-maltosazone should develop.
What to read after Practical Exercises in Comparative Physiology And Urine Analysis?
You can find similar books in the "Read Also" column, or choose other free books by Fish, Pierre A. (Pierre Augustine), 1865-1931 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
88. Dilute the .saliva with an equal volume of distilled water. Label four test tubes, A, B, C, and D. Into A place some .saliva, boil it and add some starch mucilage. In B and C place starch mucilage and saliva, to B add a few drops of hydrochloric acid and to C some caustic potash.
To D add merely the saliva to the starch mixture.
Place all four in a water bath not exceeding 40° C, and after a time test a small portion of them for .sugar with Fehling's .solution. Reserve a small amount of D. ...Why is no sugar formed in A? In B and C a strong acid and alkali arrest the action of ptyalin. Neutralize a portion of B and C and test again. Is there any result? In D the starch has been converted by the ptyalin into a reducing sugar.
89. Test a portion of D with iodine solution. The ab- sence of any blue color indicates that the starch has disap- peared, having been converted into a reducing sugar — mal- tose. Also test the remainder of A, B and C with the iodine .solution.
90. Test another portion of D withphenyl-hydraziu, (53) crystals of phenyl-maltosazone should develop.
What to read after Practical Exercises in Comparative Physiology And Urine Analysis?
You can find similar books in the "Read Also" column, or choose other free books by Fish, Pierre A. (Pierre Augustine), 1865-1931 to read onlineMoreLess
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