Archive for the 'Biology' Category
I have to do a biology practical and create a laboratory report on the question posted above. Please help me in planning the experiment.
THANX A LOT!!!
Actually, it's CHEMISTRY ESSAY, not BIOLOGY… Sorry for the error!
Use spinach leaves frozen if you can find them…because they contain a large amount of pigment…if you want to show the different amounts of pigment…use a variety of leaves.
crush the leaves…then soak in a small amount of acetone…just enough to make the crushed leaves runny.
Place an absorbent strip of paper like paper towel in the spinach acetone mixture…so that it sticks out of it…
let it sit for a little while and whooo look at that, the paper will turn green…you have just extracted the pigment of the spinich leaf.
This is a very basic way of doing it…for a actual labratory report…you need to keep exact records of how much acetone you used, how much spinach you used, what you used to do the experiement…test tubes, type of papertowel…the width and length of the paper pieces that you used, the amount of time that you let it sit, list what you used to crush it and how long/how many times you crused it…you need to list everything in detail and keep everything the same…for example…fill each test tube with the same amount of spinach and acetone, let a few sit for say 15 minutes then for 30 minutes and then for 45 minutes. Check what you see at each interval and write it down in detail. example… the pigment has moved 1/4 inch up the strip at 15 minutes and is a light green/yellow color, at 30 minutes it has moved 1/2 inch up strip and is a medium green color etc.
Simply put, control everything you can in your experiment and write down observations at each and every step.
November 15 2008 | Biology | 2 Comments »
I have to do a biology practical and create a laboratory report on the question posted above. Please help me in planning the experiment.
THANX A LOT!!!
Actually, it's CHEMISTRY ESSAY, not BIOLOGY… Sorry for the error!
Use spinach leaves frozen if you can find them…because they contain a large amount of pigment…if you want to show the different amounts of pigment…use a variety of leaves.
crush the leaves…then soak in a small amount of acetone…just enough to make the crushed leaves runny.
Place an absorbent strip of paper like paper towel in the spinach acetone mixture…so that it sticks out of it…
let it sit for a little while and whooo look at that, the paper will turn green…you have just extracted the pigment of the spinich leaf.
This is a very basic way of doing it…for a actual labratory report…you need to keep exact records of how much acetone you used, how much spinach you used, what you used to do the experiement…test tubes, type of papertowel…the width and length of the paper pieces that you used, the amount of time that you let it sit, list what you used to crush it and how long/how many times you crused it…you need to list everything in detail and keep everything the same…for example…fill each test tube with the same amount of spinach and acetone, let a few sit for say 15 minutes then for 30 minutes and then for 45 minutes. Check what you see at each interval and write it down in detail. example… the pigment has moved 1/4 inch up the strip at 15 minutes and is a light green/yellow color, at 30 minutes it has moved 1/2 inch up strip and is a medium green color etc.
Simply put, control everything you can in your experiment and write down observations at each and every step.
November 15 2008 | Biology | 2 Comments »
I have to do a biology practical and create a laboratory report on the question posted above. Please help me in planning the experiment.
THANX A LOT!!!
Actually, it's CHEMISTRY ESSAY, not BIOLOGY… Sorry for the error!
Use spinach leaves frozen if you can find them…because they contain a large amount of pigment…if you want to show the different amounts of pigment…use a variety of leaves.
crush the leaves…then soak in a small amount of acetone…just enough to make the crushed leaves runny.
Place an absorbent strip of paper like paper towel in the spinach acetone mixture…so that it sticks out of it…
let it sit for a little while and whooo look at that, the paper will turn green…you have just extracted the pigment of the spinich leaf.
This is a very basic way of doing it…for a actual labratory report…you need to keep exact records of how much acetone you used, how much spinach you used, what you used to do the experiement…test tubes, type of papertowel…the width and length of the paper pieces that you used, the amount of time that you let it sit, list what you used to crush it and how long/how many times you crused it…you need to list everything in detail and keep everything the same…for example…fill each test tube with the same amount of spinach and acetone, let a few sit for say 15 minutes then for 30 minutes and then for 45 minutes. Check what you see at each interval and write it down in detail. example… the pigment has moved 1/4 inch up the strip at 15 minutes and is a light green/yellow color, at 30 minutes it has moved 1/2 inch up strip and is a medium green color etc.
Simply put, control everything you can in your experiment and write down observations at each and every step.
November 15 2008 | Biology | 2 Comments »
I have to do a biology practical and create a laboratory report on the question posted above. Please help me in planning the experiment.
THANX A LOT!!!
Actually, it's CHEMISTRY ESSAY, not BIOLOGY… Sorry for the error!
Use spinach leaves frozen if you can find them…because they contain a large amount of pigment…if you want to show the different amounts of pigment…use a variety of leaves.
crush the leaves…then soak in a small amount of acetone…just enough to make the crushed leaves runny.
Place an absorbent strip of paper like paper towel in the spinach acetone mixture…so that it sticks out of it…
let it sit for a little while and whooo look at that, the paper will turn green…you have just extracted the pigment of the spinich leaf.
This is a very basic way of doing it…for a actual labratory report…you need to keep exact records of how much acetone you used, how much spinach you used, what you used to do the experiement…test tubes, type of papertowel…the width and length of the paper pieces that you used, the amount of time that you let it sit, list what you used to crush it and how long/how many times you crused it…you need to list everything in detail and keep everything the same…for example…fill each test tube with the same amount of spinach and acetone, let a few sit for say 15 minutes then for 30 minutes and then for 45 minutes. Check what you see at each interval and write it down in detail. example… the pigment has moved 1/4 inch up the strip at 15 minutes and is a light green/yellow color, at 30 minutes it has moved 1/2 inch up strip and is a medium green color etc.
Simply put, control everything you can in your experiment and write down observations at each and every step.
November 15 2008 | Biology | 2 Comments »
CD-ROM included
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November 13 2008 | Biology | No Comments »
Should there be warning labels on fast foods? Should SUV drivers pay extra taxes? Should employers be allowed to require drug testing of prospective employees? This introductory biology text helps you master biology while encouraging you to think about critical issues. The issues-oriented approach enlivens the subject matter and helps you grasp concepts by making connections between biology and real-life concerns. Here’s how it works: An “Impacts, Issues” case study opens each chapter, focusing on a biology-related societal issue. You also view a short film that expands on the issue. Then each chapter’s “How Would You Vote?” question, inspired by the case study, asks you to consider biology-related news, explore the facts behind the issue, apply your knowledge of biology, and cast a vote on the Web. You can also see state and nationwide voting tallies. This book has been widely praised for clear and engaging writing, art with step-by-step callouts, and terrific support from student media that all work together to help you “get” biology. Technology highlights include CengageNOW, an interactive online resource featuring personalized study plans and hundreds of animations, and an MP3 download of audio study tools that let you review concepts from the text anywhere
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November 13 2008 | Biology | No Comments »
This acclaimed text has been fully revised and updated, now incorporating issues including aging of the reproductive system, and updates on the chapters on conception and Gamete Transport and Fertilization, and Pregnancy.
“Human Reproductive Biology, 3rd edition” emphasizes the biological and biomedical aspects of human reproduction, explains advances in reproductive science and discusses the choices and concerns of today. Generously illustrated in full color, the text provides current information about human reproductive anatomy and physiology.
The ideal book for courses on human reproductive biology - includes chapter introductions, sidebars on related topics of interest, chapter summaries and suggestions for further reading.
* All material competely updated with the latest research results, methods, and topics now organized to facilitate logical presentation of topics
* New chapters on Reproductive Senescence, Conception: Gamete Transport, Fertilization, Pregnancy: Maternal Aspects and Pregnancy: Fetal Development
* Full color illustrations, New companion website featuring latest information on current related topics
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November 13 2008 | Biology | No Comments »
I am 25 and about to take my first biology laboratory course since high school! I have an undergraduate degree and did take some science classes but it has still been a while and I want to be fresh. Can anyone recommend a good online source of biology, anatomy and physiology review?
There are lots of such resources out there, but they seem to come in bits and pieces, spread over many different sites. When I finished my master’s degree, the last step was an oral examination on the wide-open topic of biology in general. It had been many years since my early days of general biology as an undergraduate. I can tell you what worked for me. Any decent college bookstore sells books that summarize large topics like biology. They are usually sold as ’study notes’ or some such. It’s all organized in a logical form, and you can work through the whole thing an a day or three. If there are any gaps in your past schoolwork, this process will point them out, and that’s when it would be useful to get on the internet and do some quick research on a specific topic. In my day, the internet was still just a gleam in someone’s eye, but I was able to simply run through the book of notes and refresh my memory a bit, and I made it through that ‘oral examination’ (read brow-beating) with very little difficulty.
November 11 2008 | Biology | 1 Comment »
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