Cancer

... the removal of cells and/or pieces of tissue for examination by a pathologist . The tissue diagnosis ... finding a benign or malignant tumor, microscopic examination of a biopsy specimen will sometimes detect a ... In addition to hyperplasia, microscopic examination of a biopsy specimen can detect another type of ...

Immunology

... 1 Histological examination of the immune system 2 Classical immunology ... See Also 8 References Histological examination of the immune system Before even the concept of ... lymphatic tissues can be surgically excised for examination while patients are still alive. Many components ...

Magnetic resonance imaging

... of the word nuclear , and to prevent patients from associating the examination with radiation exposure. Scientists still use NMR when discussing ... evaluate the brain for changes of multiple sclerosis . The typical MRI examination typically consists of 5-20 sequences, each of which are chosen to provide ...

Eugenics

... entering the country. However, several people, in particular Franz Samelson , Mark Snyderman , and Richard Herrnstein have argued, based on their examination of the records of the Congressional debates over immigration policy, that in fact Congress gave virtually no consideration to these factors. Rather, ...

Louis Pasteur

... chemical synthesis had no such effect, even though its reactions were identical and its elemental composition was the same. Pasteur noticed, upon examination of the tiny crystals of tartaric acid, that the crystals came in two asymmetric forms that were mirror images of one another. Tediously sorting the ...

Twin

... in development; they are only usually , but not necessarily , the same gender. They look alike, except that they are sometimes mirror images, but examination of details such as fingerprints can tell them apart. As they mature, identical twins often become less alike because of lifestyle choices or ...

Astrobiology

... life, e.g. silicon -based. Search for extraterrestrial life As of 2005 , there is no definite evidence of extraterrestrial life. However examination of meteors from Antarctica which are presumed to have originated from the planet Mars have provided what some scientists believe to be ...