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Heavy metals may be incorporated from solution into tissue sections for electron microscopy. The resulting increase in density of the tissue provides greatly enhanced contrast with minimal distortion. Relative densities of various structures are found to depend on the heavy metal ions present and on the conditions of staining. Certain hitherto unobserved(More)
A direct study of the isolated rat liver perfused with oxygenated blood containing amino acids and lysine-epsilon-C(14) has yielded facts indicating that the liver synthesizes practically all the plasma fibrinogen, the albumin fraction, and probably more than 80 per cent of the plasma globulin fraction. The response of the isolated perfused liver in protein(More)
A murine linkage map generated from analyses of 428 meiotic events in an interspecific cross and pulsed field gel electrophoresis allowed examination of the genomic organization of a 6000 kb segment of mouse and human chromosome 1. Analysis of five genes within this syntenic segment of both species revealed striking conservation of gene order, intergenic(More)
Methods are presented for the staining of blocks of tissue with trivalent indium so that good contrast and good specificity for nucleic acids is achieved for the electron microscope. The tissue is fixed in organic fixative, dehydrated, subjected to reduction by lithium borohydride, acetylated by acetic anhydride, stained with trivalent indium dissolved in(More)
The use of indium in this laboratory as an electron stain for nucleic acids has revealed in mammalian nuclei a granule which we believe to be hitherto unreported. The purpose of this note is to define and describe this entity and to indicate its presence in the nuclei of at least some tissues of the rat and mouse. Most tissues described here were processed(More)
A structurally and functionally related group of genes, lymph node homing receptor (LHR), granule membrane protein 140 (GMP-140), and endothelial leukocyte adhesion molecule 1 (ELAM-1) are shown to constitute a gene cluster on mouse and human chromosome 1. In situ hybridization mapped GMP-140 to human chromosome 1 bands 21-24 consistent with chromosomal(More)
The term pore complex is proposed for approximately cylindrical formations which are observed with the electron microscope to penetrate the nuclear envelope of cells. Cross-sections of the pore complex are somewhat annular in shape, but differ in appearance depending upon the level of the cross-section with respect to the nuclear surface. An explanation is(More)
  • M L WATSON
  • 1955
An electron microscope study of thin sections of interphase cells has revealed the following:- Circular pores are formed in the double nuclear envelope by continuities between the inner and outer membranes which permit contact between the nucleoplasm and the cytoplasm unmediated by a well defined membrane. The pores, seen in sections normal to the nuclear(More)