579 Atomic force microscopy and other scanning probe microscopies Helen G Hansma and Lía Pietrasanta The highlight of the past year is the unfolding and refolding of the muscle protein titin in the atomic force microscope. A related highlight in the intersection between experiment and theory is a recent review of the effects of molecular forces on biochemical kinetics. Other advances in scanning probe microscopy include entropic brushes, molecular sandwiches and applications of atomic force microscopy
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The Limits on Genetic Testing There are many arguments out there that need have the concerns of many Americans including the one that will be presented today. The biggest one in the world of science and technology is possibly genetic testing. Genetic testing has so many possibilities in the today’s society that there are legal, social, and ethical problems that allow it to stay at bay. There is fine line that should be drawn when it comes to genetic testing especially when it comes to healthcare
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Reaction Paper to Beyond the Genome Science and Society - Fall 2007 Presented by Dave Cloud Summary of Beyond the Genome The articles “Beyond the Genome”, and “DNA Dilemmas” explores the positive and negative characteristics of genetic research in the 1990’s and beyond. The authors use ethical principles, case studies, and opinion poles from various age groups to assemble public reaction to what is emerging as a very complex issue in our society today. They ponder the questions of intervention
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on their own, but then they were engulfed by other bacteria. This theory is called the Endosymbiotic Theory. This theory is proven by the fact that chloroplast and mitochondrion are the only organelles, within a cell, that have their own DNA. They also use this DNA to produce their own enzymes and proteins. Further proof is shown by the fact that both these organelles have a double layer of membrane surrounding them, and that they replicate as a bacteria does. Purpose: * Prepare a supernatant
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Genetic profiling at birth: a storm in a teacup? 18 August 2003 By Juliet Tizzard Director, Progress Educational Trust Appeared in BioNews 221 This week's BioNews reports on an interview with Human Genetics Commission chair, Baroness Helena Kennedy, in which she describes the idea of carrying out genetic profiling of newborn babies as 'unlikely'. In the interview, published in the Financial Times, Kennedy voices her concern that we might rush ahead with new genetic tests before the public is
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mother, but is nearly independent of the age of the father. • Each time a cell divides, the genetic material becomes shorter. • The ends of the chromosomes, known as "telomeres", are important for the genetic stability of the cell and they act as a DNA clock that measures the age of the cell. • The cell stops dividing and dies when the telomeres become too short. • The discovery that the egg cell can extend the telomeres of a fertilizing sperm cell is important in the development of stem cell therapy
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Genetic Engineering Although genetic engineering is an entirely new field, it has fascinated mankind for many years. Genetic engineering gives the power to change many aspects of nature and could result in a lot of life-saving and preventative treatments. Today, scientists have a greater understanding of genetics and its role in living organisms. However, if this power is misused, the damage could be very great. Therefore, although genetic engineering is a field that should be explored, it needs
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| | | | | |Original DNA Strand: |Transcription (base sequence of RNA): | | |
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to make copies of itself—its DNA—in a structure called a chromosome. In addition, it may have extra loose bits of DNA called plasmids floating in the cytoplasm. Bacteria also have ribosomes, tools necessary for copying DNA so bacteria can reproduce. Some have threadlike structures called flagella that they use to move. o A virus may or may not have an outermost spiky layer called the envelope. All viruses have a protein coat and a core of genetic material, either DNA or RNA. o The main difference
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change. Without genetic diversity, everything would look the same generation after generation. Ultimately, over time the species would become extinct. Mutation is changing the structure of a gene resulting in a different form in future generations. DNA is constantly subject to mutation or changes in the code. Mutations can be a good or bad thing. Most are actually good for us. “The good mutations that keep the world healthy are called silent mutations.” (www.geneticstheteach.org) But the mutations
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