We examined structural properties of poly d(C4A2).d(T2G4), the telomeric DNA sequence of the ciliated protozoan Tetrahymena. Under conditions of high negative supercoiling, poly d(C4A2).d(T2G4) inserted in a circular plasmid vector was preferentially sensitive to digestion with S1 nuclease. Only the C4A2 strand was sensitive to first-strand S1 cutting, with a markedly skewed pattern of hypersen...

Restriction enzyme fragmentation and recombinant DNA technology offer powerful tools with which to study gene structure, organization, and expression. Frequently in these studies the need arises to purify on a preparative scale a specific DNA molecule from a mixture. The two most commonly used procedures in such purification are isopycnic centrifugation in dye-salt gradients and gel electrophor...

we have modified one of the most useful methods of protein separation; namely, two dimensional gel electrophoresis (2-de). this modified version of 2-de is not only simpler and easier but also faster than all the currently available methods. in this method, isoelectric focusing is carried out in the first dimension using a vertical sodium dodecyl sulfate polyacrylamide gel electrophoresis (sds-...

Curli, consisting primarily of major structural subunit CsgA, are functional amyloids produced on the surface of Escherichia coli, as well as many other enteric bacteria, and are involved in cell colonization and biofilm formation. CsgE is a periplasmic accessory protein that plays a crucial role in curli biogenesis. CsgE binds to both CsgA and the nonameric pore protein CsgG. The CsgG-CsgE com...

background: rapid diagnosis and differentiation of brucella is of high importance due to the side effects of antibiotics for the treatment of brucellosis. this study aimed to identify and compare pcr-elisa as a more accurate diagnositc test with other common molecular and serological tests. methods: in this experimental and sectional study, during march 2014 to sep 2015, 52 blood samples of sus...

We describe an improved, fast, automated method for screening large genes such as BRCA2 for germline genomic mutations. The method is based on heteroduplex analysis, and has been adapted for a high throughput application by combining the fluorescent technology of automated sequencers and robotic sample handling. This novel approach allows the entire BRCA2 gene to be screened with appropriate ov...

The present paper is concerned with a correlation between clinical parameters of multiple sclerosis and different agar gel electrophoretical patterns in CSF. The agar gel electrophoresis represents clearly the most sensitive method for the demonstration of oligoclonal bands in CSF.

Several advanced techniques to detect mutations have been developed during the last years. Scanning procedures can be classified as "physical" and "cleavage" methodologies. Physical methods include Denaturing Gradient Gel Electrophoresis, Single-Strand Conformation Polymorphism and Heteroduplex Analysis while cleavage methods include RNAse A Cleavage, Chemical Mismatch Cleavage and Enzyme Misma...