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Phage display cycle. 1) fusion proteins for a viral coat protein + the gene to be evolved (typically an antibody fragment) are expressed in bacteriophage. 2) the library of phage are washed over an immobilised target. 3) the remaining high-affinity binders are used to infect bacteria. 4) the genes encoding the high-affinity binders are isolated.
Plaques from a virus isolated from a compost heap near UCLA. The bacterium is M. smegmatis. A viral plaque is a visible structure formed after introducing a viral sample to a cell culture grown on some nutrient medium. The virus will replicate and spread, generating regions of cell destruction known as plaques.
Plaque hybridization is a technique used in Molecular biology for the identification of recombinant phages. [1] The procedure can also be used for the detection of differentially represented repetitive DNA. The technique (similar to colony hybridization) involves hybridizing isolated phage DNA to a label probe for the gene of study.
Cells infected by rotavirus (top) and uninfected cells (bottom). The focus forming assay (FFA) is a variation of the plaque assay, but instead of depending on cell lysis in order to detect plaque formation, the FFA employs immunostaining techniques using fluorescently labeled antibodies specific for a viral antigen to detect infected host cells and infectious virus particles before an actual ...
Neoplastic conditions - Central diabetes insipidus can result from primary or secondary brain malignancies that affect the hypothalamic-pituitary area; secondary tumors are typically caused by metastasis from lung or breast cancer, leukemia, or lymphoma. [14] Additionally, central diabetes insipidus is seen in myelodysplastic syndrome. [15]
Filamentous phage Cf1t from Xanthomonas campestris (of NCBI's proposed species Xanthomonas phage Cf1t, incertae sedis within Inoviridae, likely misspelled as Cflt), [24] was shown in 1987 to integrate into the host bacterial genome, and further such temperate filamentous phages have since been reported, many of which have been implicated in ...
Diabetes insipidus (DI) is a condition characterized by large amounts of dilute urine and increased thirst. [1] The amount of urine produced can be nearly 20 liters per day. [ 1 ] Reduction of fluid has little effect on the concentration of the urine. [ 1 ]
Depending on the virus, the plaque forming units are measured by microscopic observation, fluorescent antibodies or specific dyes that react with infected cells. [3] The concentration of serum to reduce the number of plaques by 50% compared to the serum free virus gives the measure of how much antibody is present or how effective it is.