Fifty-seven strains of various Rhizobium species were analyzed by two-dimensional gel electrophoresis. Since the protein pattern on such gels is a reflection of the genetic background of the tested strains, similarities in pattern allowed us to estimate the relatedness between these strains. All group II rhizobia (slow growing) were closely related and were very distinct from group I rhizobia (...

Two-dimensional gel-electrophoresis (2-DE) images show the expression levels of several hundreds of proteins where each protein is represented as a blob-shaped spot of grey level values. The spot detection, that is, the segmentation process has to be efficient as it is the first step in the gel processing. Such extraction of information is a very complex task. In this paper, we propose a novel ...

1. A specific collagenase from the culture medium of rabbit synovial fibroblasts was purified by gel filtration and ion-exchange chromatography. 2. The enzyme was homogeneous on polyacrylamide-gel electrophoresis and showed only traces of contaminants when tested in gels with a non-specific antiserum. 3. Therabbit fibroblast collagenase could hydrolyse collagen both in solution and in fibrillar...

Arylsulfatase A (cerebroside sulfate sulfohydrolase) was purified 3500-fold at a 7% yield from human urine. A crude urinary protein concentrate was prepared by treating pooled urine with ammonium sulfate and subsequently drying the precipitate with acetone. The powder thus obtained was extracted with buffer and was subjected to chromatographic and electrophoretic procedures as follows: (a) ammo...

A simple, rapid method is described for separating the serum lipoproteins into clear, discrete and reproducible bands by polyacrylamide disc gel electrophoresis. The sample is prestained with Sudan Black B in a sample gel and resolved by electrophoresis in a discontinuous pH system consisting of a sample gel, concentrating gel and separating gel. 30 young healthy males and 20 young healthy fema...

In this preliminary report, we describe a polyacrylamide gel electrophoresis technique for the resolution of isoenzyme patterns of four isolates of Entamoeba histolytica and one isolate of Entamoeba coli. Our findings were similar to previous findings for three enzyme systems: maleic enzyme (malate dehydrogenase [EC 1.1.1.40]), hexokinase (EC 2.7.1.1), and phosphoglucomutase (EC 2.7.5.1). We fo...