to a lesser extent the cormels. As food for human consumption‚ the nutritional value of the various parts of cocoyam is primarily caloric (Davies et al‚ 2008). The underground cormels provide easily digested starch; and the leaves are nutritious spinach-like vegetable‚ which give a lot of minerals‚ vitamins and thiamine (Tambong et al‚ 1997). There are two major types commonly grown in Nigeria‚ namely; Colocasia spp and Xanthosoma spp. In Nigeria‚ it is regarded as a major crop especially in female
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appropriate columns and the corresponding g-force‚ number of layers‚ and position of layers position results. You will need to use the following formula to assist with your laboratory report G-force 0 00001118 x radius of centrifuge arm x (rpm)2 The radius of the centrifuge arm for this instrument is 10 cm. Speed 5000 rpm 10000 rpm 15000 rpm 20000 rpm G-force27951118025155 44720 Number of Layers 2 4 5 3 Position of Layers Top and middle of tube 2 at the top And 2 in the middle/bottomAll layers nearly
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Abstract In order to experiment with distinct components of a mixture‚ they must be first separated so they can be observed individually. This is accomplished in this lab by the technique called thin layer chromatography (TLC). TLC involves a stationary phase‚ which the TLC plates as well as a mobile phase‚ which could be one of two solvents used: ethanol-acetone for TLC. Dyes in a sample separate consequently because of their unique polarities. As a result‚ nonpolar substances travel further
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gas exchange and uptake of oxygen. The skin of many frogs is thin and extremely vascular to allow for gas exchange and thus can live in moist environments and secrete mucous from their skin to avoid desiccation. Cutaneous respiration
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appears to have a little bit of color missing. 2. The egg remains firm. 3. 15.5cm 4. 48 1. The eggs shell is beginning to disappear. 2. The shell of the egg is cracking all around. 3. 16 and ¼cm 4. 72 1. The shell is completely gone‚ leaving a thin membrane that surrounds the yolk. 2. The egg itself looks flimsy and appears transparent. 3. 17cm Conclusion: Be sure to answer the following reflection questions in the conclusion of your lab report: 1. How much did the egg change in size?
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inert‚ so it won’t react with the sample to give a false reading. The stationary phase is a substance fixed in place to which the sample adsorbs because of the attractive forces that exist between molecules (intermolecular forces). In GC‚ it’s a thin layer of a high boiling point (bpt)‚ non-volatile liquid or polymer adsorbed onto an inert solid support or silica particles. GC requires compounds
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Cited: Day‚ Christopher the Power of Garlic. http://www.Culinary.com/foodarticles/thepowerofgarlic.php Sonia Stairs. “Boundary Garlic”. http://www.garlicfarm.ca/‚ 2002. Holly S. kennel‚ “Planting Garlic”. http://gardening.wsu.edu/column/09-29-02.htm‚ Western Washington‚ 2002. Peggy Trowbridge Filippone‚ “Garlic History”. New York times company‚ 2009.
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3. This is due to the structure of disperse red 9 being more symmetrical than that of disperse blue 3 and having more nonpolar bonds. Disperse blue 3 is more polar because it has a hydroxide bond and has a larger dipole. The principle behind using column chromatography is that it separates compounds based on polarity. The alumina serves to allow for a purer separation than TLC plates because it has a more polar surface than silica gel does. The less polar dye moves first because it is not as soluble
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chlorophyll and beta carotene from plant leaves using column chromatography. 2. To qualitatively characterise the pigments with UV-vis spectroscopy and TLC. 2. Results and discussion Isolation of beta carotene and chlorophylls by column chromatography Upon the loading of S1 (the extract of the plant leaves in hexane)‚ a yellow band appeared at the top part of the silica column immediately after the solvent level descended to just above the sand layer. This yellow band later developed to about 2 centimetres
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leaves. It requires using a blade or scalpel to cut off the cross section of the leaf including an enlarged part which is the midrib that is located in the lamina and has fine extensions called veins. Some leaves are flat and wide; others are spiky and thin. Three distinguishable areas such as‚ the upper and lower epidermis that are perforated by small openings called stomata‚ mesophyll and the vascular tissue was revealed. INTRODUCTION Leaf is the primary photosynthetic organ of most
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