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How Cells Obtain Energy

How Cells Obtain Energy

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Biology Study Guides - SparkNotes Home → SparkNotes → Biology Study Guides Biology Subjects Cell Structure Twin DNA test: Why identical criminals may no longer be safe 14 January 2014Last updated at 20:57 ET By Alison Gee BBC World Service It's well known that identical twins are not totally identical - they can, usually, be told apart, after all. But up to now it has been almost impossible to distinguish their DNA.

How does caffeine affect the body? Biologist Neal J. Smatresk--Dean of the College of Science at the University of Texas at Arlington--offers this explanation: Caffeine--the drug that gives coffee and cola its kick--has a number of physiological effects. At the cellular level, caffeine blocks the action of a chemical called phosphodiesterase (PDE). Inside cells, PDE normally breaks down the second chemical messenger cyclic adenosine monophosphate (cAMP). Many hormones and neurotransmitters cannot cross the cell membrane, and so they exert their actions indirectly via such second messengers; when they bind to a receptor on the surface of a cell, it initiates a chemical chain reaction called an enzyme cascade that results in the formation of second messenger chemicals.

Doctors 3D-print 'living' body parts Image copyright Wake Forest Custom-made, living body parts have been 3D-printed in a significant advance for regenerative medicine, say scientists. The sections of bone, muscle and cartilage all functioned normally when implanted into animals. The breakthrough, published in Nature Biotechnology, raises the hope of using living tissues to repair the body. Experts described the technology, developed in the US, as a "goose that really does lay golden eggs". The idea of placing individual human cells in a precise pattern to replace a damaged jaw, missing ear or scarred heart muscle holds much promise.

Biology History The objects of our research will be the different forms and manifestations of life, the conditions and laws under which these phenomena occur, and the causes through which they have been effected. The science that concerns itself with these objects we will indicate by the name biology [Biologie] or the doctrine of life [Lebenslehre]. Although modern biology is a relatively recent development, sciences related to and included within it have been studied since ancient times. Natural philosophy was studied as early as the ancient civilizations of Mesopotamia, Egypt, the Indian subcontinent, and China. However, the origins of modern biology and its approach to the study of nature are most often traced back to ancient Greece.[6] While the formal study of medicine dates back to Hippocrates (ca. 460 BC – ca. 370 BC), it was Aristotle (384 BC – 322 BC) who contributed most extensively to the development of biology.

Gene therapy 'could be used to treat blindness' 15 January 2014Last updated at 20:55 ET By Pallab Ghosh Science correspondent, BBC News Jonathan Wyatt likened his blindness to being at the edge of an abyss Surgeons in Oxford have used a gene therapy technique to improve the vision of six patients who would otherwise have gone blind. The operation involved inserting a gene into the eye, a treatment that revived light-detecting cells.

How do you cite website material that has no author, no year, and no page numbers? Because the material does not include page numbers, you can include any of the following in the text to cite the quotation (from pp. 170–171 of the Publication Manual): A paragraph number, if provided; alternatively, you could count paragraphs down from the beginning of the document. An overarching heading plus a paragraph number within that section. A short title in quotation marks, in cases in which the heading is too unwieldy to cite in full. Because there is no date and no author, your text citation would include the title (or short title) "n.d." for no date, and paragraph number (e.g., "Heuristic," n.d., para. 1).

Sperm carries information about dad's weight Turns out dads are also eating for two. A study published December 3 in Cell Metabolism reveals that a man's weight affects the heritable information contained in sperm. The sperm cells of lean and obese men possess different epigenetic marks, notable at gene regions associated with the control of appetite. The comparisons, which included 13 lean men and 10 obese men, offer one biological explanation for why children of obese fathers are themselves more predisposed to obesity. In the next phase of the study, the investigators tracked 6 men undergoing weight-loss surgery to see how it affected their sperm. Science Printables Confessions of a Homeschooler Homeschool Mom Blog with Free Printables, Curriculum, Preschool, and More! Science Printables

Mutation in key gene allows Tibetans to thrive at high altitude Buddhist monks at a monastery in Xiahe. The gene mutation is an adaptation to low oxygen levels on the Tibetan plateau. Photograph: Mark Ralston/AFP/Getty Images Writing in Psychology: Experimental Report Writing Summary: Written for undergraduate students and new graduate students in psychology (experimental), this handout provides information on writing in psychology and on experimental report and experimental article writing. Contributors:Dana Lynn Driscoll, Aleksandra KasztalskaLast Edited: 2013-03-11 09:54:55 Experimental reports (also known as "lab reports") are reports of empirical research conducted by their authors. You should think of an experimental report as a "story" of your research in which you lead your readers through your experiment.

Nano-balls filled with poison wipe out metastatic cancer in mice For most cancer patients, it’s not the original tumor that poses the greatest risk. It’s the metastases that invade the lung, liver, and other tissues. Now, researchers have come up with an approach that tricks these spinoff tumors into swallowing poison. So far the strategy has only been tested in mice, where it proved highly effective.

30 Ways to Define Leadership Credit: Rawpixel/Shutterstock Webster's Dictionary defines leadership as "the power or ability to lead other people," but for most people, there's a lot more to it than that. Ask anyone what it means to be a leader, and you'll likely hear something unique every time. That's because everyone has his or her own idea of what leadership is, but not every boss leads a team the same way. Stem cell 'major discovery' claimed 29 January 2014Last updated at 06:52 ET By James Gallagher Health and science reporter, BBC News Stem cell researchers are heralding a "major scientific discovery", with the potential to start a new age of personalised medicine. Scientists in Japan showed stem cells can now be made quickly just by dipping blood cells into acid. Stem cells can transform into any tissue and are already being trialled for healing the eye, heart and brain.

Les explications sont bonnes et exactes, par contre la qualité vidéo laisse à désirer. by juliendemers Feb 12