Biology videos

Articles

• abscess
  9 June 2004

  abcesses
  Definition: Abscesses are localized collections of purulent inflammatory tissue caused by suppuration buried in a tissue, an organ, or a confined space. They are produced by deep seeding of pyogenic bacteria into a tissue.
  Abscesses have a central region that appears as a mass of necrotic leukocytes and tissue cells. There is usually a zone of preserved neutrophils around this necrotic focus, and outside this region vascular dilation and parenchymal and fibroblastic proliferation (...)

• histones
  16 July 2003

  histone proteins

• acute inflammation
  1 June 2004

  Digital cases
  Case 25 (HPC:25) : Acute appendicitis
  Case 94 (HPC:94) : Acute appendicitis
  Case 13 (HPC:13) : Acute synovitis
  Definition: Acute inflammation is a rapid response to an injurious agent that serves to deliver mediators of host defense-leukocytes and plasma proteins-to the site of injury.
  Types - Lesional patterns
  acute inflammation
  congestive inflammation
  cellular acute inflammation
  suppurative inflammation / suppuration
  abcess / abcesses / abcedation (...)

• teratoma
  10 March 2004

  teratomas
  Definition: Teratomas are neoplasms comprised of mixed elements derived from the three germ cell layers.
  Images
  Gastric teratoma in a 1yo male
  https://twitter.com/DraEosina/status/817663085376901121
  A teratoma is generally defined as a tumor arising from pluripotent cells, and it is precisely the heterogeneity of tissues present in such a tumor that best characterizes it; it is also commonly accepted that a teratoma must contain derivatives of more than one blastodermic (...)

• citric acid cycle
  29 October 2003

  Krebs cycle

• systemic lupus erythematosus
  16 October 2003

  Definition: Systemic lupus erythematosus (SLE) is an autoimmune disease that is characterized by autoantibodies specific for highly conserved nuclear antigens, such as double-stranded DNA, histones and ribonuclear proteins.
  Digital case
  JRC:10585 : Cutaneous lupus erythematosus.
  Images
  LE cell in peritoneal fluid : https://twitter.com/pwraess/status/732709988368416768
  The requirements for the activation and response of self-reactive B cells — the source of autoantibodies — seem to be (...)

• apoptosis
  25 June 2003

  GO:0006915 WKP
  Definition: Apoptosis is characterized by a series of dramatic perturbations to the cellular architecture that contribute not only to cell death, but also prepare cells for removal by phagocytes and prevent unwanted immune responses.
  See also : necroptosis
  Much of what happens during the demolition phase of apoptosis is orchestrated by members of the caspase family of cysteine proteases (CASPs).
  These proteases target several hundred proteins for restricted (...)

• chromatin
  13 July 2003

  See also : chromatin appearance / chromatin anomalies
  Definition: Chromatin is the DNA/protein/RNA complex extracted from eukaryotic lysed interphase nuclei. Just which of the multitudinous substances present in a nucleus will constitute a part of the extracted material will depend in part on the technique each researcher uses. Furthermore, the composition and properties of chromatin vary from one cell type to the another, during development of a specific cell type, and at different stages (...)

• gene expression
  16 October 2003

  protein expression

• cytoplasmic membrane
  9 June 2003

  plasma membrane, plasmic membrane, cell membrane

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