Tetrapyrrole compounds: chlorophyll and heme groups By Erwin Lim 1. Tetrapyrrole compounds A tetrapyrrole compound is a chemical group that consists of four pyrroles that are joined together by covalent bonds‚ forming a porphyrin ring. They are naturally occurring pigments‚ which are used in many biological processes (Berg‚ 2009). The basic structure of a tetrapyrrole is as seen in Figure 1‚ while the basic structure of a pyrrole is as seen in Figure 2. Figure 1.Tetrapyrrole Compound (Berg‚ 2009)
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Identifying Ionic Compounds Written by Ashleigh Lara. In our experiment we were given 5 different cations who’s mixture of anions ranged from five to three different solutions. At every single station we were given the following materials a spot plate‚ a dropper‚ and the chemicals used to mix with our main substance. Each substance received 3 drops of the different chemicals which were able to give us an observation of what the compound was made into. Many of our experiments color‚ texture and solubility
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To Tell or Not to Tell Does keeping secrets really make you feel better? Throughout the novel‚ Hawthorne uses the symbols of light and dark to depict the good and evil among the characters in the story The Scarlet Letter including‚ Hester Prynne‚ Arthur Dimmesdale‚ and Roger Chillingworth. Some characters keep secrets in this story so they don’t get in trouble. But Hester Prynne‚ with a mind of native courage and activity‚ and for so long a period not merely estranged‚ but outlawed‚ from society
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Overcoming social media procrastination Are you someone who would open up facebook and skype on your laptop once you get home? Since most of us people are exposed to the internet‚ social media procrastination has increasingly affected us. Some say its controllable‚ but most people say it isn’t. The average person spends up to 24 hours or more a week online. Students like me tend to spend that time online while we should be concentrating on work. Students that procrastinate like me end up sleeping
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Alternative ending The last chapter I went on with my life‚ without Tulip Pierce I felt better‚ what she said was: “Natalie me and Tulip need to talk to you tomorrow after school in front of the cafeteria on the first floor. This chat will bring a smile on your face and will make you happy. Also the talk will also be about Tulip’s smiling at you every time you see her.” The next day the school went so slow that I almost slept in mathematics. I took my books and my jacket and went to the cafeteria. While
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Substance abuse is a growing problem that not only affects the person who is abusing alcohol or drugs but affects the lives of those who are close to the abuser. Substance abuse is the abuse of any substance. A drug is a substance that modifies one or more of the body’s functions when it is consumed. Everything from over-the-counter pain medication‚ to opiates‚ prescription drugs such as Oxycontin‚ alcohol‚ cocaine‚ heroin and even coffee can be abused in one way or another. The two main substances
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Mass media doesn’t tell you what to think‚ but it tells you what to think about Body 1 According to Stanley J. Baran’s (2002) definition of Agenda setting‚ it is a theory that argues that the media may not tell us what to think‚ but the media tells us what to think about. Since the media cannot tell us what to think‚ it cannot dictate ones’ opinion on a subject. An example of this is the subject of taxes. This issue is commonly discussed by the media‚ but it is up to the audience’s interpretation
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can be sent to an instructor obseRvations & QUestions - paRt i A. Record your observations and your time and temperature data in tables. Use one table for the pure water and one table for the salt solution. Data Table 1: Pure Water and Salt Solution | Seconds | Distilled H20Room temp | Distilled H20 Ice bath | SaltwaterRoom temp | Saltwater Ice bath | 0 | 25 | 19 | 24 | 12 | 30 | 24 | 13 | 23 | 8 | 60 | 23 | 11 | 22 | 5 | 90 |
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BLG & Co.‚ CPAs 306 3rd Flr. MSA Second St.‚ Ayala-Alabang‚ Muntinlupa City Philippines SUBSTANTIVE TESTS – PURCHASE/ACQUISITION TRANSACTIONS ASSERTIONS OBJECTIVE PROCEDURES I. Existence Or Occurrence II. Rights and Obligations To determine that recorded purchases are for items that were acquired. To determine that purchases are the entity’s acquisitions and liabilities. For a sample of purchase transactions recorded in the purchases journal‚ trace vouchers to authorized purchase
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COORDINATION COMPOUNDS: * FLEXIDENTATE CHARACTER OF POLYDENTATE LIGANDS; * Poly dentate ligands have flexi dentate character in the sense that all donors atoms may not form coordinate bonds with the central metal atom or ion. For example; EDTA which is the hexa dentate ligand also acts as tetra dentate or penta dentate in certain complexes. Similarly sulphate ion‚ which is a bi dentate ligand‚ also acts as a mono dentate ligand in certain complexes‚ e.g. in [Co(SO4)(NH3)5]Cl. * LABILE
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