Hot springs microbe yields record-breaking, heat-tolerant enzyme Bioprospectors from the University of California, Berkeley, and the University of Maryland School of Medicine have found a microbe in a Nevada hot spring that happily eats plant material – cellulose – at temperatures near the boiling point of water. In fact, the microbe’s cellulose-digesting enzyme, called a cellulase, is most active at a record 109 degrees Celsius (228 degrees Fahrenheit), significantly above the 100℃ (212℉) boiling point of water. A 94°C geothermal pool, with a level-maintaining siphon, near Gerlach, Nevada. This so-called hyperthermophilic microbe, discovered in a 95℃ (203℉) geothermal pool, is only the second member of the ancient group Archaea known to grow by digesting cellulose above 80℃. “These are the most thermophilic Archaea discovered that will grow on cellulose and the most thermophilic cellulase in any organism,” said coauthor Douglas S. Clark and coworkers at UC Berkeley are teaming with colleagues, led by Frank T. For more information:
Scientist creates lifelike cells out of metal Scientists trying to create artificial life generally work under the assumption that life must be carbon-based, but what if a living thing could be made from another element? One British researcher may have proven that theory, potentially rewriting the book of life. Lee Cronin of the University of Glasgow has created lifelike cells from metal — a feat few believed feasible. The discovery opens the door to the possibility that there may be life forms in the universe not based on carbon, reports New Scientist. Even more remarkable, Cronin has hinted that the metal-based cells may be replicating themselves and evolving. "I am 100 percent positive that we can get evolution to work outside organic biology," he said. The high-functioning "cells" that Cronin has built are constructed from large polyoxometalates derived from a range of metal atoms, like tungsten. The metallic bubbles are certainly cell-like, but are they actually alive? The early results have been encouraging.
Stem Cell Basics: Introduction Laboratory studies of stem cells enable scientists to learn about the cells’ essential properties and what makes them different from specialized cell types. Scientists are already using stem cells in the laboratory to screen new drugs and to develop model systems to study normal growth and identify the causes of birth defects. Principles behind the Agile Manifesto We follow these principles: Our highest priority is to satisfy the customer through early and continuous delivery of valuable software. Welcome changing requirements, even late in development. Deliver working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale. Business people and developers must work together daily throughout the project. Build projects around motivated individuals. The most efficient and effective method of conveying information to and within a development team is face-to-face conversation. Working software is the primary measure of progress. Agile processes promote sustainable development. Continuous attention to technical excellence and good design enhances agility. Simplicity--the art of maximizing the amount of work not done--is essential. The best architectures, requirements, and designs emerge from self-organizing teams. Return to Manifesto
Manifesto for Agile Software Development Manifeste agile Un article de Wikipédia, l'encyclopédie libre. Le Manifeste agile est un texte rédigé par 17 experts du développement d'applications informatiques sous la forme de plusieurs méthodes dites agiles. Ces experts estimaient que le traditionnel cycle de développement en cascade ne correspondait plus aux contraintes et aux exigences des organisations en évolution rapide. Les méthodes agiles ne sont pas apparues avec l’Agile manifesto en 2001 mais celui-ci détermine leur commun dénominateur et consacre le terme d'« agile » pour les référencer. Les valeurs et principes du Manifeste agile sont défendus par l'Agile Alliance. Introduction[modifier | modifier le code] De cette réunion devait émerger le Manifeste agile, considéré comme la définition canonique du développement agile et de ses principes sous-jacents[1]. Le Manifeste agile est constitué de 4 valeurs et de 12 principes fondateurs. Le Manifeste Agile débute par la déclaration suivante (traduction) : Les 4 valeurs[modifier | modifier le code]
Mike Cohn Mike Cohn, 2013 He has served as Vice President of Development at four different companies that successfully employed agile concepts and strategies and been a technology executive in companies of various sizes, from start-up to Fortune 40. Cohn is the author of Agile Estimating and Planning, User Stories Applied for Agile Software Development and Succeeding with Agile: Software Development using Scrum, as well as books on Java and C++ programming[4] and articles for Better Software, IEEE Computer, Software Test and Quality Engineering, Agile Times, Cutter IT Journal, and the C++ Users' Journal. Cohn is a founding member of the Scrum Alliance, Inc. and on its Board of Directors.[9] As a Certified Scrum Trainer and a member of the IEEE Computer Society and the ACM, he is a frequent speaker at industry conferences. Publications[edit] Mike Cohn (2004). Online Presentations[edit] References[edit] External links[edit] Mike Cohn's Homepage
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