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Organic matter frequently represents the single largest fraction of fine particulates in urban environments and yet the exact contributions from different sources and processes remain uncertain, owing in part to its substantial chemical complexity. Positive Matrix Factorisation (PMF) has recently proved to be a powerful tool for the purposes of source(More)
The basic machinery for the translocation of proteins into or across membranes is remarkably conserved from Escherichia coli to humans. In eukaryotes, proteins are inserted into the endoplasmic reticulum using the signal recognition particle (SRP) and the SRP receptor, as well as the integral membrane Sec61 trimeric complex (composed of alpha, beta and(More)
Homologues of the gene encoding the 54K (M(r) 54,000) subunit of the mammalian signal recognition particle have been identified in different organisms. The Escherichia coli homologue, termed ffh (for fifty-four homologue), specifies a protein (Ffh) that shares many properties with its eukaryotic counterpart, including association with mammalian 7S RNA and(More)
Concentrations and fluxes of eight volatile organic compounds (VOCs) were measured during October 2006 from a high telecom tower above central London, as part of the CityFlux contribution to the REPARTEE I campaign. A continuous flow disjunct eddy covariance technique with analysis by proton transfer reaction mass spectrometry was used. Daily averaged VOC(More)
Eddy-covariance measurements of carbon dioxide fluxes were taken continuously between October 2006 and May 2008 at 190 m height in central London (UK) to quantify emissions and study their controls. Inner London, with a population of 8.2 million (∼5000 inhabitants per km 2) is heavily built up with 8% vegetation cover within the central boroughs. CO 2(More)
The use of lacZ gene fusions, producing a hybrid protein containing an amino terminus specified by a target gene fused to the functional carboxy terminus of beta-galactosidase, has facilitated the study of protein targeting in various organisms. One of the best characterized fusions in Escherichia coli is phi(lamB-lacZ)42-1(Hyb), which produces a hybrid(More)
Scope The purpose of this supplementary material is to present the data used to determine the most appropriate number of factors to be used in each of the datasets presented in the paper when subjected to PMF analysis. An additional graph is also shown to give examples of mass spectra of questionable physical merit resulting from inappropriate values of the(More)
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