Introduction The purpose of this experiment is to determine the maximum absorbance of fast green‚ and the chlorophylls‚ also in the case of fast green create a concentration curve to determine an unknown substance. Each test will use the spectrophotometer. Spectroscopy is the study of light. A spectrophotometer is a machine used to determine the absorbance of light at any given wavelength. It does this by using a source of white light through a prism‚ which gives multiple wavelengths that
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compounds. There are two phases in photosynthesis‚ the light reaction and dark reaction. The following experiment tested only the light reaction. Photosynthesis takes place on the chloroplast‚ and the chloroplast contains chlorophyll pigments which absorb light energy. Pigments are particular to different wavelengths. The following experiment helped determined the fastest photosynthetic reaction rate from wavelength ranging from 450‚ 545‚ 650‚ and 750 nm‚ and intensities 3‚ 7‚ 15‚ 35‚ and 150 uEinsteins/m^2/sec
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in twigs and branches for preparation of winter dormancy. This combined with a lack of sunlight causes chlorophyll production to slow and ultimately cease. Without chlorophyll the leaves lose their green coloring and other pigments in leaves that were masked by the green pigment begin to become more prominent. This explains why leaves go from green to brown‚ orange‚ red‚ and sometimes purple. When this color change happens the leaves develop a special tissue called an Abscission Layer‚ which allows
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chromatograph was invented by Russian botanist Mikhail Semenovich Tsvett (1872-1919). While working in Poland‚ Tsvett was looking for a method of separating a mixture of plant pigments (tints) which are chemically very similar to each other. To isolate different types of chlorophyll‚ he trickled a mixture of dissolved pigments through a glass tube packed with calcium carbonate powder. As the solution washed downward‚
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was born but while growing the hair turned to a light yellow-brown and the eyes were described as being clear light brown with dark pupils. Growing up‚ Crews also had a strong aversion to light (like a certain Biology teacher)‚ due to the lack of pigments in his eyes. As a result he ended up with a permanent squint and a general dislike of fire. Other cases of albinism have not been so normal. In African countries such as Tanzania and Burundi‚ there has been a rise in witchcraft-related killings
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Planktons: groups of tiny floating organisms that cannot swim against the current. *Taxonomy: size‚ function‚ autotrophs-producers‚ heterotrophs-consumers/decomposers‚ mixotrophs‚ complex‚ symbiotic/parasitic *Small to big: femtoplankton (viruses)‚ pico (bacteria)‚ nano (diatoms‚ dinoflagellates)‚ micro(sameasnano+protozoa)‚ meso(mostly zooplankton)‚ macroplankton *Grazing food chain: Phyto->zooplk->fish *Sinking flux: dead fall to deeper ocean POM: Particulate organic material DOM:
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Chapter 3: Cell Structure Notes The cell is the basic unit of biologic organization of the human body Protoplasm: an aqueous colloidal solution of carbohydrates‚ proteins‚ lipids‚ nucleic acids‚ and inorganic salts surrounded by a limiting cell membrane Cells in our respiratory tract produce mucus to trap dust and microorganisms that get past the hairs in our nose then move the material to our throat to be swallowed and passed out through the digestive system The most prominent structure in the
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and can affect skin pigment as well. •Merle is actually a heterozygote of an incompletely dominant gene. • Retrotransposon is responsible for the merle mutation in dogs. Double Merle’s are dogs who have two copies of the Merle gene‚ are usually born mostly white or solid white‚ and are usually either blind‚ deaf‚ or both.
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Summary of Presentation: Fe2+/H2O- mediated synthesis of Melanins: Cases of Homogentisic acid‚ serotonin‚ and norepinephrine The powerpoint presentation that I attended was titled‚ “Fe2+/H2O- mediated synthesis of Melanins: Cases of Homogentisic acid‚ serotonin‚ and norepinephrine‚” the research covered melanin which is a dark pigmentation that can cause other complication and pathological conditions such as‚ vitiligo and ochronosis. It is believed that melanin protects from ultraviolet light rays
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Center Laboratory 323. Partners Names Taylor Jackson and Matt D’Angelo. Taylor‚ Matt‚ and I shared the same data. Purpose/Goals/Objectives The purpose of this experiment was for each student to use column chromatography to separate plant pigments from spinach leaves. Some goals and objectives were to observe the effect of the increasing polar eluent fractions‚ to analyze the different fractions collected‚ and to correlate the structure of the components with polarity and behavior on a chromatographic
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