Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. Images of life on Earth Wildscreen's Arkive project was launched in 2003 and grew to become the world's biggest encyclopaedia of life on Earth. With the help of over 7,000 of the world’s best wildlife filmmakers and photographers, conservationists and scientists, Arkive.org featured multi-media fact-files for more than 16,000 endangered species. Freely accessible to everyone, over half a million people every month, from over 200 countries, used Arkive to learn and discover the wonders of the natural world. Since 2013 Wildscreen was unable to raise sufficient funds from trusts, foundations, corporates and individual donors to support the year-round costs of keeping Arkive online.
Learn Biology Online For Free with our Huge Collection of Open Courses If you’ve always been interested to learn more about nature and the diversity of life, you can now Learn Biology Online for Free! Free Biology courses are easy to find yet some of the ones you find may not be worth your time. We’ve put together a list of Biology courses from well-respected institutions such as John Hopkins, Yale, MIT, Stanford, and UCLA. Hopefully, this free resources will help you advance your knowledge of Biology towards a career in education, medicine, research, and agriculture. MOOCs are Massive Open Online Courses. They are university courses that have been put online, often with enhanced functionality such as Lecture Notes, mini-quizzes and other special features.
Biomedical Beat: May 20, 2009 - National Institute of General Me IN THIS ISSUE . . . May 20, 2009 Check out the Biomedical Beat Cool Image Gallery. Got research news to share? E-mail us at info@nigms.nih.gov. Diversity "Diversity is not about how we differ. Diversity is about embracing one another's uniqueness." - Ola Joseph Fire and Water on a Hot, Turbulent Planet - Dot Earth Blog The Earth Observatory Web site of NASA is a vital portal, not only providing data that help scientists clarify global conditions and trends but also reminding people, once in awhile, of the special nature of this pale blue (and green) dot. Today’s images show the scope of two unfolding disasters — involving excessive fire and water — related to extreme climate conditions that are projected to become more frequent in a heating world. The fires sweeping parched, baked peat bogs and forests in western Russia have raised a vast smoke pall captured by NASA satellites. (See similar images of Canada’s smoke pall to get a sense of the severity of the Russian blazes.) At the same time, NASA has posted images of the Indus River valley in Pakistan vividly showing the scope of severe flooding, the worst in 70 years, that has displaced several million people.
It's Plantin' Time! One of the most anticipated science units in my classroom is our study of life cycles. We spend most of our fourth quarter studying the life cycles of plants, butterflies, frogs, and mealworms. It's one of my most favorite times of the year and one that my kiddos really look forward to! Protein Data Bank A Structural View of Biology This resource is powered by the Protein Data Bank archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease. As a member of the wwPDB, the RCSB PDB curates and annotates PDB data. The RCSB PDB builds upon the data by creating tools and resources for research and education in molecular biology, structural biology, computational biology, and beyond.
Eukaryote Eukaryotes can reproduce both asexually through mitosis and sexually through meiosis and gamete fusion. In mitosis, one cell divides to produce two genetically identical cells. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells each with half the number of chromosomes as the original parent cell (haploid cells). These act as sex cells (gametes – each gamete has just one complement of chromosomes, each a unique mix of the corresponding pair of parental chromosomes) resulting from genetic recombination during meiosis.