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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There are different types of Compound Interest. Interest is the amount of money earned in a saving account. * Simple Interest: Interest calculated once on the principal. * Compound Interest: Interest calculated for a given segment of time of the investment. For example‚ compounded monthly‚ means the interest is calculated each month and combined with the principal. So‚ for the next month‚ interest is earned on the interest. Continuously Compound Interest Formula P: ending
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Look at the two maps ___ India in 1857 and India in 1765. Study the maps and answer the following questions. 1. What differences do you se e between them? 2. Do you notice the disappearance of many Indian kingdoms? 3. Name them. 4. Under whose rule was most of India by 1857? 5. What strategies were adopted by them to bring India under their control? Chemistry 1. 2. 3. 4. Describe the process as to how rayon is prepared? What are the advantages of using synthetic fibres over natural fibres? From
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Chromatography • • • Separation based on polarity of compounds Two potential phases for a compound to exist in: mobile and stationary Partitioning of compounds between mobile phase and stationary phase occurs: o Compounds that are less polar move more in the mobile phase‚ those that are more polar “stick” more on the stationary phase o These polarity differences cause compounds move at different rates and therefore can be separated 1. Mobile Phase: the phase the moves; can be gas or
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A heterogeneous mixture is not uniform throughout. Therefore‚ separate components of a heterogeneous mixture can be separated by using differences in the components’ physical properties. In this laboratory experiment‚ I attempted to experimentally verify that the components of a heterogeneous mixture containing salt‚ sand‚ and benzoic acid can be separated using the separate components’ solubility properties (ability to dissolve in water). Because it is known that organic compounds (such as benzoic
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The Difference Between Religion and Spirituality Rebecca M. Sherman University of California‚ Davis Abstract This paper draws from six published works that deal with psychological and scholarly research on religion and spirituality. The works vary in their definitions and use of the concepts and terminology of religion and spirituality. Hood et al. (2009) suggest that that social scientists have traditionally been able to make a distinction between religion and spirituality in their research
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TYPES OF COMPOUNDS Endocentric: AB = B A= modifier B= head Take a look at the following example toothpaste Is it a type of tooth? or; Is it a type of paste? Definition of toothpaste from www.macmillandictionary.com soft thick subtance (paste) that you put on a toothbrush to clean your teeth Tooth is the modifier (A) of the head (B) paste. AB=B toothpaste = a type of paste for brushing teeth In most cases the head is the rightmost component of the compound. English N-N Compounds *
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August 15‚ 2012 COMPOUND MICROSCOPE A compound microscope is an optical instrument used to see objects that are too small for the naked eye. A compound microscope is a microscope fitted with two or more convex lenses. The high magnification produced by these lenses together enables a detailed study of micro-organisms‚ cells and tissues. These types of microscopes are therefore widely used in scientific and medical research. The basic design of a compound light microscope consists
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Purpose: In this lab‚ a mixture of naphthalene (C10H8)‚ common table salt (NaCl)‚ and sea sand (SiO2) will be separated using the separation techniques in order to demonstrate the properties of mixtures and their ability to be separated by physical means. INTRODUCTION: This lab was based on the separation of the components of a mixture. A mixture can be defined as a physical combination of two or more pure substances. Separation techniques are used to separate components that are not chemically
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then moved to the United States of America three years ago‚ I experienced a big culture shock. Everything was very different here compared to where I come from. It was a big opportunity for me to explore the new world. I got to learn about the differences between Vietnamese and American families‚ education‚ and food. 2 In Vietnam‚ family is very important; everybody in the family stays close together. It does not matter what age you are‚ you can still live at home with your parents until whenever you
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