The Effects of DCMU on Photosynthesis Selected toxin: DCMU (3-(3‚4-dichlorophenyl)-1‚1-dimethylurea): DCMU is a herbicide and a known inhibitor of photosynthesis. It blocks the flow of electrons from photosystem II to plastoquinone‚ disrupting the electron transport chain. What are its physical properties: Physical properties of the herbicide DCMU are that it is a white‚ odorless‚ and crystalline (forms crystals) solid. At room temperature it has a neutral pH‚ meaning it has a pH of seven‚ the
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electron-optical column’‚ vacuum system and electronics and display system. Figure 1: Layout off scanning Electron Microscope. In the optical part of instrument‚ the first thing we notice is the need for a source of illumination. No visible photons of light are produced within the SEM but an invisible beam of electrons. The beam is produced from an electron gun’ and a cross-section through a simplified electron gun is shown below. Figure 2: Cross-section through an electron gun A V-shaped
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the injection was made‚ a cranial opening was made near the paramedian lobule and a coverslip was created right on top of the dura and the surgical cyanoacrylate. The researchers waited at least two weeks for the mice to recover‚ and an in vivo two-photon microscopy was performed by using a laser-scanning confocal microscope and external‚ non-descanned photomultiplier tubes. The parallel fibers were identified in raw z-stacks‚ and their changes in time were recorded. The size of appearance and disappearance
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plants at the end of six weeks and record the data. The first step of photosynthesis is the absorption of light by a chlorophyll molecule. "The energy of the absorbed photon is transferred from one chlorophyll molecule to another until it reaches a site called a reaction center....One oxygen molecule is produced per eight photons absorbed." (Alberty 708) James Huheey‚ professor at the University of Maryland‚ talks about chlorophyll in his book Inorganic Chemistry: "Chlorophyll absorbs low-energy
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Electromagnetic radiation Electromagnetic radiation (EM radiation or EMR) is one of the fundamental phenomena of electromagnetism‚ propagating and traveling through space via photon wave particles‚ carrying radiant energy. In a vacuum‚ it propagates at a characteristic speed‚ the speed of light‚ normally in straight lines. EMR is emitted and absorbed by charged particles. As an electromagnetic wave‚ it has both electric and magnetic field components‚ which oscillate in a fixed relationship to one
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Part I Multiple choice or short answer questions 1) (2 points) Identify a solid a. Definite volume and no definite shape b. no definite volume and no definite shape c. definite volume and definite shape 2) (2 points) A substance composed of two or more elements in a fixed‚ definite proportion is a. A solution. b. A heterogeneous mixture. c. An alloy. d. A homogeneous mixture. e. A compound. 3) (2 points) Read the water
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Sources and Components – Definitions 1. Forward Biased LED – Semiconductor diode with a positive voltage applied to the p-region and a negative voltage to the n-region. 2. Incoherent Light – Light in which the electric and magnetic fields of photons are completely random in orientation. Incoherent light is typically emitted from light bulbs and LEDs. 3. Laser – Acronym for light amplification by stimulated emission of radiation. The laser produces a coherent source of light with a narrow beam
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DIVISION OF CHEMISTRY :MODULE: GENERAL CHEMISTRY (CHY2021) TUTORIAL # 2 DATE: September 2013 1. Define the following terms: mass number‚ atomic number and the atomic mass unit (amu). 2. With the help of The Periodic Table‚ complete the table below. Symbol Atomic # Proton # Neutron # # of Electrons Mass Number Charge Ar 19 31 17 18 35 20 18 3+ 40 3. In your own words‚ explain Thomson’s and Rutherford’s contribution to the atomic theory. Give sketches to substantiate your answer. 4. Explain
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produces a color different the starting flame color. When the coffee stirrer was put into the flame‚ the element’s atoms (from the solution of the stirrer) left the original level of energy. When the atoms fell back to ground level‚ they released photons in the form of colored flame. Using the flame test‚ unknown compounds can be identified when they are burned since each element has a specific color. (Douma‚ 2008). The color of the flame produced from the heated atoms can be recorded as a line
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warmth and light‚ providing the necessities for life. Even now we are still finding many uses for the massive amount of energy the sun produces. Light travels to the earth in about eight seconds and is filled with little packets of energy called photons‚ which make utalizing this solar power possible. There are three main ways to collect solar power. The first two are called passive system and active system. These use the sun ’s energy to heat up an object which can be transferred to another object
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