density of stomata in the upper and lower epidermis of a dicotyledonous leaf. Stomata are the principle means of gas exchange in plants. Stomata are small pores they are controlled by guard cells which control the opening and closing of stomata. Stomata allow carbon dioxide to enter the plant‚ and allow water and excess oxygen to escape. About 90% of water is lost from the leaf during transpiration. The number of stomata on leaf surface varies among different species. The lower epidermis tends to
Premium Leaf Plant physiology Arithmetic mean
Thin-Layer Chromatography of Analgesics Abstract: In this experiment thin-layer chromatography (TLC) was used to determine the composition of an unknown mixture of analgesics given five references of AC‚ ASP‚ CAF‚ IBU‚ SAL‚ an unknown consisting of a mixture of three of the references‚ and two unknowns (6‚23) containing a single reference compound. The composition of the unknown mixture and two single unknowns were determined by spotting the reference compounds and the unknown compounds on two
Premium Thin layer chromatography Acetic acid
Chromatography Experiment of the Drosophila Eye Pigmentation Pathway Introduction: How can the use of chromatography help explain single gene mutations of the drosophila melanogaster bio-synthetic pigment pathway? This experiment was meant to help connect the mode of inheritance with different eye color mutations and pinpoint where they occur in the pigment pathway. The drosophila eye color is a result of two bio-synthetic eye color pathways‚ this is expressed as a trait or phenotype‚ a multigene
Premium Eye color Mutation Enzyme
mobile phase can be liquid‚ gas‚ or supercritical fluid. How Does Chromatography Work? Chromatography is a surface effect. It works by first starting off with an unidentified liquid being injected into a column. As the chemicals in the liquid move down the column‚ they separate depending on their physical and chemical attributes‚ such as speed and weight. To easily picture the process‚ the example will pertain to a paper chromatography process in which the liquid is moving over the paper‚ separating
Premium Chromatography Gas chromatography Analytical chemistry
Orange Leaf Froyo 5 C’s Customer: Orange Leaf has a wide variety of customers‚ ranging from very young children‚ all the way up to the elderly. Anyone who enjoys a delicious treat can be a customer at Orange Leaf! Company: The Orange Leaf Company’s mission statement is “We work hard to make the best froyo you’ve ever tasted and are committed to becoming a valuable partner in your community.” Orange Leaf is unique in that they not only strive to be the best frozen yogurt company around‚ but their
Premium Ice cream Customer Demographics
Gas Chromatography: Purifying alcohol Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied
Premium Chemistry Gas chromatography Chromatography
A backpack leaf blower completes a supertask of clearing and accumulating flotsam and jetsam from yards. With high limit motors‚ a leaf blower backpack can tidy up a yard covered with debris and jetsam inside a small amount of the time. A leaf blower unit likewise lets in the individual running it to transport easily. Backpack leaf blowers come in either electric controlled or fuel controlled styles. Leaf blower backpacks are intended to offer solace when being used to chip away at their grass for
Premium Flotsam and jetsam Shipwreck
19‚ October 2010 Fitzgerald‚ Prompt 1 Introduction A. Intro hook‚ Quote from honeymooners B. Thesis statement: Gender roles in “A New Leaf” portray men as the providers and dominant‚ females as subordinate caretakers‚ and it vastly limits decision making to choices that are deemed “appropriate” for men and women alike. How are male and female characters portrayed? A. Women – Caretakers‚ nurturing‚ invested into beauty B. Men-Providers‚ indestructible‚ intelligent
Premium Management Strategic management Marketing
Affinity chromatography technique is used to separate proteins found in a mixture of solution. Affinity chromatography uses the strong interaction between a given protein and its corresponding molecule. In today’s lab‚ affinity chromatography was used to purify L-lactate dehydrogenase‚ which contains histidine-tagged protein. The histidine- tagged protein forms a strong interaction with the Ni-NTA column due to the presence of nickel ions. Varying concentration of imidazole was added to the column
Premium Chromatography Protein Analytical chemistry
understand that because substances have different properties‚ such as mass‚ that can be separated by chromatography. In our experiment‚ we chose 4 different color source to separate in water. We made sure that all the sources were water soluble because only polar substances will dissolve in water. We chose a black wet-erase marker‚ a red marker‚ a green marker‚ and mixed food coloring to test. The chromatography paper was split into 4 sections‚ about 2 cm above the bottom edge and evenly spaced out. Each
Premium Chromatography Chemistry Analytical chemistry