Equality and Closure: The Paradox of Local Citizenship

In Bourgeois Utopias, a cultural history of suburbia in America, Robert Fishman states the fundamental paradox about the suburbs: “[H]ow can a form based on the principle of exclusion include every-one?” The promise of the American suburb was that every middle-class family would be able to own a home with a yard, but this egalitarian ideal was illusory because what made the suburbs appealing was precisely what it excluded, namely everything having to do with the city—its congestion, political corruption, and most importantly, its racial diversity. And so, as suburbia was mass-produced and made avail-able with cheap low-interest loans to white middle-class families, racial minorities were rigidly excluded. Although several waves of demographic change have reshaped the suburbs over the generations, this paradox remains evident today. Suburbs are becoming more dense and more diverse as many minorities have migrated from “inner cities” toward first-ring suburbs, and immigrants have found welcoming enclaves in the suburbs. But while suburbs have grown more diverse, they have also grown more segregated. High opportunity suburbs with plentiful jobs and good schools mandate low-density sprawl through zoning regulations, like mini-mum lot size and floor area requirements, parking mandates, and set-backs, that have the cumulative effect of making housing scarce and expensive. Only the very affluent or those lucky enough to have purchased a home years ago are welcome in these places. Racial minorities who, thanks to the earlier generation of suburban exclusion, have not had the opportunity to build the inter-generational wealth that is often a prerequisite to purchasing a home in the suburbs still find themselves locked out of the most desirable communities. The infra-structure of suburban communities, such as roads, sewers, and schools, are designed, perhaps deliberately, to completely collapse if the number of users increases by even a small amount, so these communities fiercely oppose any efforts to densify and permit more housing. Even modest attempts at densification are treated as calls to destroy suburban neighborhoods. But because our society has made a decision, undoubtedly questionable in retrospect, to treat suburban homeownership as the central tool for wealth building in this country, we cannot hope to meet our national aspirations for equality without opening up our suburbs to more housing. And so the question re-mains—how can a form based on the principle of exclusion include everyone

Neighborhood Empowerment and the Future of the City

In any given metropolitan region, there are scores of municipalities locked in a zero-sum struggle for mobile sources of jobs and tax revenue. This competition appears to advantage small, homogenous suburbs over large, diverse cities because the former can directly enact the uniform will of the electorate rather than becoming ensnarled in conflict between competing interest groups. Cities can level the playing field with suburbs, however, by devolving municipal power to smaller, more homogenous subgroups within the city, such as neighborhoods. Indeed, one such effort at neighborhood empowerment, the “business improvement district,” (BID) has been widely identified as a key factor in the recent revitalization of many central cities. The BID, and the related “special assessment district,” essentially devolve the financing of infrastructure and services to landowners within a territorially designated area. Courts have widely upheld special assessment districts and BIDs against constitutional challenges. Cities remain hamstrung in competing with suburbs, however, because courts prohibit cities from delegating perhaps the most coveted power of all to neighborhood groups: zoning. Since an unusual series of Supreme Court cases in the early twentieth century, it has been largely settled that cities may not constitutionally delegate the zoning power to sub-municipal groups, at least where the power is delegated specifically to landowners in a certain proximity to a proposed land use change (a scheme I designate a “neighborhood zoning district”). This article argues that there is a serious inconsistency in a jurisprudence that treats BIDs and special assessment districts as unproblematic while prohibiting neighborhood zoning districts. As I demonstrate, these devices are in fact conceptually identical. Both the neighborhood zoning district and the special assessment/BID are designed to enable large, diverse cities to capture some of the governance advantages of small, homogenous suburbs by providing landowners with the direct ability to manage local externalities. This article attempts to make sense of the disparate treatment accorded these devices by examining several grounds upon which they could potentially be distinguished. I find, however, that special assessment districts/BIDs actually raise far more troubling public policy concerns than neighborhood zoning districts. I conclude that courts should broadly defer to municipal delegations of power to sublocal groups, so that cities can work out their own strategies for surviving in an era of intense inter-local competition

Small and mighty: adaptation of superphylum Patescibacteria to groundwater environment drives their genome simplicity.

BackgroundThe newly defined superphylum Patescibacteria such as Parcubacteria (OD1) and Microgenomates (OP11) has been found to be prevalent in groundwater, sediment, lake, and other aquifer environments. Recently increasing attention has been paid to this diverse superphylum including > 20 candidate phyla (a large part of the candidate phylum radiation, CPR) because it refreshed our view of the tree of life. However, adaptive traits contributing to its prevalence are still not well known.ResultsHere, we investigated the genomic features and metabolic pathways of Patescibacteria in groundwater through genome-resolved metagenomics analysis of > 600 Gbp sequence data. We observed that, while the members of Patescibacteria have reduced genomes (~ 1 Mbp) exclusively, functions essential to growth and reproduction such as genetic information processing were retained. Surprisingly, they have sharply reduced redundant and nonessential functions, including specific metabolic activities and stress response systems. The Patescibacteria have ultra-small cells and simplified membrane structures, including flagellar assembly, transporters, and two-component systems. Despite the lack of CRISPR viral defense, the bacteria may evade predation through deletion of common membrane phage receptors and other alternative strategies, which may explain the low representation of prophage proteins in their genomes and lack of CRISPR. By establishing the linkages between bacterial features and the groundwater environmental conditions, our results provide important insights into the functions and evolution of this CPR group.ConclusionsWe found that Patescibacteria has streamlined many functions while acquiring advantages such as avoiding phage invasion, to adapt to the groundwater environment. The unique features of small genome size, ultra-small cell size, and lacking CRISPR of this large lineage are bringing new understandings on life of Bacteria. Our results provide important insights into the mechanisms for adaptation of the superphylum in the groundwater environments, and demonstrate a case where less is more, and small is mighty

Characterization of subsurface media from locations up- and down-gradient of a uranium-contaminated aquifer.

The processing of sediment to accurately characterize the spatially-resolved depth profiles of geophysical and geochemical properties along with signatures of microbial density and activity remains a challenge especially in complex contaminated areas. This study processed cores from two sediment boreholes from background and contaminated core sediments and surrounding groundwater. Fresh core sediments were compared by depth to capture the changes in sediment structure, sediment minerals, biomass, and pore water geochemistry in terms of major and trace elements including pollutants, cations, anions, and organic acids. Soil porewater samples were matched to groundwater level, flow rate, and preferential flows and compared to homogenized groundwater-only samples from neighboring monitoring wells. Groundwater analysis of nearby wells only revealed high sulfate and nitrate concentrations while the same analysis using sediment pore water samples with depth was able to suggest areas high in sulfate- and nitrate-reducing bacteria based on their decreased concentration and production of reduced by-products that could not be seen in the groundwater samples. Positive correlations among porewater content, total organic carbon, trace metals and clay minerals revealed a more complicated relationship among contaminant, sediment texture, groundwater table, and biomass. The fluctuating capillary interface had high concentrations of Fe and Mn-oxides combined with trace elements including U, Th, Sr, Ba, Cu, and Co. This suggests the mobility of potentially hazardous elements, sediment structure, and biogeochemical factors are all linked together to impact microbial communities, emphasizing that solid interfaces play an important role in determining the abundance of bacteria in the sediments

Colour reconnection in e+e- -> W+W- at sqrt(s) = 189 - 209 GeV

The effects of the final state interaction phenomenon known as colour reconnection are investigated at centre-of-mass energies in the range sqrt(s) ~ 189-209 GeV using the OPAL detector at LEP. Colour reconnection is expected to affect observables based on charged particles in hadronic decays of W+W-. Measurements of inclusive charged particle multiplicities, and of their angular distribution with respect to the four jet axes of the events, are used to test models of colour reconnection. The data are found to exclude extreme scenarios of the Sjostrand-Khoze Type I (SK-I) model and are compatible with other models, both with and without colour reconnection effects. In the context of the SK-I model, the best agreement with data is obtained for a reconnection probability of 37%. Assuming no colour reconnection, the charged particle multiplicity in hadronically decaying W bosons is measured to be (nqqch) = 19.38+-0.05(stat.)+-0.08 (syst.).Comment: 30 pages, 9 figures, Submitted to Euro. Phys. J.

Search for the Standard Model Higgs Boson with the OPAL Detector at LEP

This paper summarises the search for the Standard Model Higgs boson in e+e- collisions at centre-of-mass energies up to 209 GeV performed by the OPAL Collaboration at LEP. The consistency of the data with the background hypothesis and various Higgs boson mass hypotheses is examined. No indication of a signal is found in the data and a lower bound of 112.7GeV/C^2 is obtained on the mass of the Standard Model Higgs boson at the 95% CL.Comment: 51 pages, 21 figure

An Atlas of FUSE Sight Lines Toward the Magellanic Clouds

We present an atlas of 57 Large Magellanic Cloud (LMC) and 37 Small Magellanic Cloud (SMC) observations obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite. The atlas highlights twelve interstellar absorption line transitions at a resolution of ~15 km/s. These transitions cover a broad range of temperatures, ionization states, and abundances. The species included are OVI, which probes hot (T~3x10^5 K) ionized gas; CIII and FeIII, which probe warm (T~10^4 K) ionized gas; SiII, PII, CII, FeII, and OI, warm neutral gas; and six different molecular hydrogen transitions, which trace cold (T<=500 K) gas. We include Schmidt Halpha CCD images of the region surrounding each sight line showing the morphology of warm ionized gas in the vicinity, along with continuum images near each FUSE aperture position. Finally, we present several initial scientific results derived from this dataset on the interstellar medium of the Magellanic Clouds and Galactic halo.Comment: 29 pages, 6 figures. Complete Atlas of 94 additional images (~800kB each) is available at http://fuse.pha.jhu.edu/~danforth/atlas Accepted to the ApJS March 200

Search for R-Parity Violating Decays of Scalar Fermions at LEP

A search for pair-produced scalar fermions under the assumption that R-parity is not conserved has been performed using data collected with the OPAL detector at LEP. The data samples analysed correspond to an integrated luminosity of about 610 pb-1 collected at centre-of-mass energies of sqrt(s) 189-209 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle is expected to be unstable. Searches of R-parity violating decays of charged sleptons, sneutrinos and squarks have been performed under the assumptions that the lightest supersymmetric particle decays promptly and that only one of the R-parity violating couplings is dominant for each of the decay modes considered. Such processes would yield final states consisting of leptons, jets, or both with or without missing energy. No significant single-like excess of events has been observed with respect to the Standard Model expectations. Limits on the production cross- section of scalar fermions in R-parity violating scenarios are obtained. Constraints on the supersymmetric particle masses are also presented in an R-parity violating framework analogous to the Constrained Minimal Supersymmetric Standard Model.Comment: 51 pages, 24 figures, Submitted to Eur. Phys. J.