Biology News
BMW C evolution scooter ride review: Dancing on the limits of electrical range - Autoweek


Autoweek
My friend and colleague John L. Stein is one of, if not the most, respected motorcycle journalists alive. He has been writing about motorcycles since the Nixon administration. Stein needed a BMW C evolution at his house and I happened to have one. I ...

Stretching The Boundaries Of Cell Biology - Science Friday


Science Friday
Throughout their lifetimes, the cells in our bodies have a number of decisions to make. Should they divide and multiply? If they're stem cells, what kind of tissue or cell should they become? And, sooner or later, should they die? In order to make ...

Stem cell scientists chew on the mysteries of jaw development - Phys.Org


Phys.Org
In the study published in Developmental Cell, first author Lindsey Barske and colleagues report that two related genes, called Nr2f2 and Nr2f5, pattern the jaw by regulating the timing by which stem cells generate skeletal cells. As in our bodies, the ...

CELLS alive: Mitosis

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This animation demonstrates the stages of mitosis in an animal cell. Use the control buttons in the upper left to run the complete animation.

Events during Mitosis

Interphase: Cells may appear inactive during this stage, but they are quite the opposite. This is the longest period of the complete cell cycle during which DNA replicates, the centrioles divide, and proteins are actively produced. For a complete description of the events during Interphase, read about the Cell Cycle.

Prophase: During this first mitotic stage, the nucleolus fades and chromatin (replicated DNA and associated proteins) condenses into chromosomes. Each replicated chromosome comprises two chromatids, both with the same genetic information. Microtubules of the cytoskeleton, responsible for cell shape, motility and attachment to other cells during interphase, disassemble. And the building blocks of these microtubules are used to grow the mitotic spindle from the region of the centrosomes.

Prometaphase: In this stage the nuclear envelope breaks down so there is no longer a recognizable nucleus. Some mitotic spindle fibers elongate from the centrosomes and attach to kinetochores, protein bundles at the centromere region on the chromosomes where sister chromatids are joined. Other spindle fibers elongate but instead of attaching to chromosomes, overlap each other at the cell center.

Metaphase: Tension applied by the spindle fibers aligns all chromosomes in one plane at the center of the cell.

Anaphase: Spindle fibers shorten, the kinetochores separate, and the chromatids (daughter chromosomes) are pulled apart and begin moving to the cell poles.
Telophase: The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear.

Cytokinesis: The spindle fibers not attached to chromosomes begin breaking down until only that portion of overlap is left. It is in this region that a contractile ring cleaves the cell into two daughter cells. Microtubules then reorganize into a new cytoskeleton for the return to interphase.

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During development from stem to fully differentiated, cells in the body alternately divide (mitosis) and "appear" to be resting (interphase). This sequence of activities exhibited by cells is called the cell cycle. Interphase, which appears to the eye to be a resting stage between cell divisions, is actually a period of diverse activities. Those interphase activities are indispensible in making the next mitosis possible.

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Human neutrophils are constantly produced in the marrow and released into the blood to search for invading pathogens. Apoptosis AnimationAfter only one day, they "commit suicide" and are replaced by younger cells. Beginning with the typical neutrophil shape, the apoptotic neutrophil in the clip above undergoes a series of changes including violent membrane blebbing, called zeiosis, (animation to the right) and fragmentation of DNA creating a vacu

Mitosis
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Explains the various steps in the process of cell division and multiplication.

Mitosis World
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Includes numerous movies as well as links to researchers and journals.

Introduction to Mitosis
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Offers a pictorial tour of the process of cell division.

Poems of Mitosis & Meiosis
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Mitosis doesn't do a lot of work than meiosis, But it's a special factor that Biologist can't even resist. The process is dived into four general stages. A process that will last for the ages. The four general stages are considered phases, Involving prophase, Metaphase, Anaphase, and Telophase. The Mitosis process begins with interphase, This is when cell divisions are growing in such a rapid pace. This is the place where everything starts, A sim

Cell Cycle and Mitosis Tutorial
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Includes images and a QuickTime animation of the process.

Are Viruses Alive?
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Educational site that discusses what defines life and whether viruses fit into this definition.

Oceans Alive
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Celebrates marine biodiversity and explores ways to help save our oceans.

Gondwana Alive
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Organization promoting biodiversity and working to stem the Sixth Extinction.