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We directly observed real-time production of single protein molecules in individual Escherichia coli cells. A fusion protein of a fast-maturing yellow fluorescent protein (YFP) and a membrane-targeting peptide was expressed under a repressed condition. The membrane-localized YFP can be detected with single-molecule sensitivity. We found that the protein molecules are produced in bursts, with each burst originating from a stochastically transcribed single messenger RNA molecule, and that protein copy numbers in the bursts follow a geometric distribution. The quantitative study of low-level gene expression demonstrates the potential of single-molecule experiments in elucidating the workings of fundamental biological processes in living cells. (More...)

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Nano Neuro Knitting Rebuilding

Brains Nanotechnology is often associated with materials fabrication, microelectronics, and microfluidics. Until now, the use of nanotechnology and molecular self assembly in biomedicine to repair injured brain structures has not been explored. To achieve axonal regeneration after injury in the CNS, several formidable barriers must be overcome, such as scar tissue formation after tissue injury, gaps in nervous tissue formed during phagocytosis of dying cells after injury, and the failure of many adult neurons to initiate axonal extension...

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Quorum sensing provides a mechanism for bacteria to monitor one another's presence and to modulate gene expression in response to changes in population density. Autoinducers are packaged in a variety of ways and have varying half-lives, depending on their roles. Autoinducer signals are integrated within each cell by second-messenger systems, probably by cdiGMP signaling. (More...)

How does a DNA repair enzyme find a deleterious base lesion within a huge excess of normal base pairs? Banerjee et al. show that a bacterial DNA glycosylase can examine an intact DNA helix, and does not need to extrude damaged base pairs. Instead, a conserved phenylalanine residue inserts into the helical stack and causes buckling at the intercalation site. (More...)

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