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Adult Stem Cells and Regeneration
Doug Melton and Nadia Rosenthal are leaders in stem cell research, working primarily with mouse and human tissue. They will discuss where embryonic and adult stem cells come from and the biology of how they supply the cells the body needs. Stem cells are fundamental to biology. In the course of embryonic development, stem cells generate all the specialized cells that populate body tissues like muscle, the nervous system, and blood. In adults, reserves of stem cells repair and regenerate tissues damaged by disease and wounding. Because of the potential of stem cells to generate fresh, healthy cells, there is a huge interest in cultivating them to treat various diseases. This year\'s Holiday Lectures will explore exciting progress toward the goal of harnessing stem cells to treat diabetes, nerve damage, and heart disease.
Tags: stem cell Regeneration Status: protected
Created: March 16, 2009, 1:19 am

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Protein Synthesis
This video set explains protein sythesis in detail.Protein synthesis is the creation of proteins using DNA and RNA. Proteins can often be synthesized directly from genes by translating mRNA. When a protein is harmful and needs to be available on short notice or in large quantities, a protein precursor is produced. A proprotein is an inactive protein containing one or more inhibitory peptides that can be activated when the inhibitory sequence is removed by proteolysis during posttranslational modification. A preprotein is a form that contains a signal sequence (an N-terminal signal peptide) that specifies its insertion into or through membranes; i.e., targets them for secretion.[1] The signal peptide is cleaved off in the endoplasmic reticulum.[1]. Preproproteins have both sequences (inhibitory and signal) still present. Text Reff: Wiki
Tags: Protein Synthesis Status: private_owner_approval
Created: March 16, 2009, 11:02 am

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Deconstructing Obesity Lectures
In the 2004 Holiday Lectures on Science, HHMI investigators Ronald M. Evans and Jeffrey M. Friedman discuss how the body regulates weight by carefully controlling the storage and burning of fat—and how a better understanding of these complex metabolic systems could lead researchers to treatments that curb obesity and improve public health.
Tags: obesity Status: private_owner_approval
Created: March 16, 2009, 3:49 pm

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Viruses
Several Videos explaining virus cycle, structure and the way they infect. You are welcome to add videos related to this topic. Wikipedia info: A virus (from the Latin virus meaning toxin or poison) is a sub-microscopic infectious agent that is unable to grow or reproduce outside a host cell. Viruses infect all cellular life. The first known virus, tobacco mosaic virus, was discovered by Martinus Beijerinck in 1899,[1] and now more than 5,000 types of virus have been described.[2] The study of viruses is known as virology, and is a branch of microbiology.
Tags: virus Status: public
Created: March 14, 2009, 10:56 pm

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Mitosis
Mitosis videos are grouped under this topic. Wikipedia info: Mitosis is the process in which a eukaryotic cell separates the chromosomes in its cell nucleus, into two identical sets in two daughter nuclei.[1] It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle - the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.
Tags: mitosis Status: public
Created: March 14, 2009, 11:00 pm

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Apoptosis
Apoptosis related Videos. Wikipedia info text: Apoptosis (IPA: /ˌæpəpˈtoʊsəs/(the second \'p\' is soft) [1]) is the process of programmed cell death (PCD) that may occur in multicellular organisms. Programmed cell death involves a series of biochemical events leading to a characteristic cell morphology and death, in more specific terms, a series of biochemical events that lead to a variety of morphological changes, including blebbing, changes to the cell membrane such as loss of membrane asymmetry and attachment, cell shrinkage, nuclear fragmentation, chromatin condensation, and chromosomal DNA fragmentation (1-4). (See also Apoptosis DNA fragmentation.) Processes of disposal of cellular debris whose results do not damage the organism differentiate apoptosis from necrosis.
Tags: apoptosis Status: private_owner_approval
Created: March 16, 2009, 6:13 pm

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Meiosis
Meiosis related videos. Wikipedi text: In biology or life science, meiosis (pronounced IPA:[maɪˈəʊsɪs]) is a process of reductional division in which the number of chromosomes per cell is halved. In animals, meiosis always results in the formation of gametes, while in other organisms it can give rise to spores. As with mitosis, before meiosis begins, the DNA in the original cell is replicated during S-phase of the cell cycle. Two cell divisions separate the replicated chromosomes into four haploid gametes or spores. Meiosis is essential for sexual reproduction and therefore occurs in all eukaryotes (including single-celled organisms) that reproduce sexually. A few eukaryotes, notably the Bdelloid rotifers, have lost the ability to carry out meiosis and have acquired the ability to reproduce by parthenogenesis. Meiosis does not occur in archaea or bacteria, which reproduce via asexual processes such as binary fission.
Tags: meiosis Status: private_owner_approval
Created: March 16, 2009, 6:32 pm

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