Low-temperature (7 °C) anaerobic treatment of a trichloroethylene-contaminated wastewater: microbial community development

The feasibility of low-temperature (7 °C) anaerobic digestion for the treatment of a trichloroethylene (TCE) contaminated wastewater was investigated. Two expanded granular sludge bed (EGSB) bioreactors (R1 and R2) were employed for the mineralisation of a synthetic volatile fatty acid based wastewater at an initial organic loading rate (OLR) of 3 kg COD m⁻³ d⁻¹, and an operating temperature of 15 °C. Successive reductions in OLR to 0.75 kg COD m⁻³ d⁻¹, and operational temperature to 7 °C, resulted in stable bioreactor operation by day 417, with COD removal efficiency and biogas CH₄ content ≥74%, for both bioreactors. Subsequently, the influent to R1 was supplemented with increasing concentrations (10, 20, 30 mg l⁻¹) of TCE, while R2 acted as a control. At an influent TCE concentration of 30 mg l⁻¹, although phase average TCE removal rates of 79% were recorded, a sustained decrease in R1 performance was observed, with COD removal of 6%, and % biogas CH₄ of 3% recorded on days 595 and 607, respectively. Specific methanogenic activity (SMA) assays identified a general shift from acetate- to hydrogen-mediated methanogenesis in both R1 and R2 biomass, while toxicity assays confirmed an increased sensitivity of the acetoclastic community in R1 to TCE and dichloroethylene (DCE), which contributed to acetate accumulation. Quantitative Polymerase Chain Reaction (qPCR) analysis of the methanogenic community confirmed the dominance of hydrogenotrophic methanogens in both R1 and R2, representing 71-89% of the total methanogenic population, however acetoclastic Methanosaeta were the dominant organisms, based on 16S rRNA gene clone library analysis of reactor biomass. The greatest change in the bacterial community, as demonstrated by UPGMA analysis of DGGE banding profiles, was observed in R1 biomass between days 417 and 609, although 88% similarity was retained between these sampling points.     

Current distribution and recent development of sessile oak forests in Montseny (1956–2015)

There is a distribution limit of sessile oak (Quercus petraea) in the northern half of the Iberian Peninsula, with its southernmost populations located at the xeric limit for the species. We present here the current distribution of these populations in the Montseny Massif (N.E. Catalonia) and how the surface area they cover has developed over the last 50 years. Using a new high-resolution map (1:5000) we have calculated that Q. petraea currently covers 64.1 ha, and is found between 450 and 1150 m above sea level with a predominantly southern exposure, with the north-facing slopes being dominated by beech forests. With regard to its recent development, 44% of what is now dense forest was, in 1956, much more dispersed while 11% of it consisted of open spaces or shrubs. Such changes clearly show that, in Montseny, Q. petraea is well capable of regenerating its forest canopy as well as colonising adjacent environments.     

The 1968 Tehran master plan and the politics of planning development in Iran (1945–1979)

ABSTRACT

This paper traces the relationship between state development policies and planning Tehran’s urban development from 1945 until the 1979 Islamic Revolution. It shows how the geopolitical context of the Cold War, and the political agendas of multilateral and bilateral development agencies (i.e. the World Bank and the Ford Foundation), together with the specific circumstances of the national modernization of Iran, were decisive in shaping the Iranian planning administration and the emergence of a comprehensive master planning approach. Moreover, this study demonstrates the critical role of the Iranian technocratic elite and professional middle class in establishing planning institutions and advocating for a vision of progress and development. The focus here is on the formation of the ‘Plan Organization’ as the first modern planning institution in Iran, and the ways in which this institution played a key role in shaping Iranian expert culture and urban planning practices. By examining the links between national development policies and urban planning, this paper presents how comprehensive master planning emerged as the preferred model for the planning and development of Iranian cities. The focus here is on the design and implementation of Tehran’s 1968 Comprehensive Master Plan.     

Economic growth and development in Macau (1999–2016): The role of the booming gaming industry

In 2018, Macau will celebrate the 20th anniversary of its return to China. The past few years have witnessed brilliant economic achievements as well as a structural shift toward a gaming-industry dominated economy. Following so many years of rapid growth, it is essential to take stock of both the benefits and costs of gaming industry development. Accordingly, this paper analyzes the evolution of Macau's gaming industry between 1999 and 2016, and evaluates the industry's effects on local economic growth and urban development. As the paper shows, Macau has exhibited many of the symptoms typically associated with booming sectors in small economies, and has witnessed the similar effects widely experienced by western casino cities. However, Macau is also faced with some unique challenges, regarding its geographic location, size constraints, and political factors. These findings illustrate the difficulties that have accompanied Macau's economic achievements, but also call attention to opportunities in the next phase of Macau's development.     

Displacements in the name of (re)development: the contested rise and contested demise of colonial ‘African’ housing estates in Kampala and Jinja

This paper examines historical and contemporary processes of urban (re-)development and displacement in Uganda. Particular focus concerns the often conflicting strategies employed by urban managers and residents to plan, govern and live in both the late-colonial and early twenty-first century city. Both eras can be considered significant, even momentous, for the prominence of strategic projects of socio-spatial urban reconfiguration that incorporate(d) powerful discourses fusing land and housing development with societal progress and national development. The former project putatively centred on orchestrating African development and welfare, the latter on the more ambiguous project of re-development. The ‘Good City’ and the ‘Good Citizen’ are used as heuristic devices to examine the planning ideals and rationalities that inform(ed) these projects and the conflict of rationalities they provoke(d), particularly in terms of competing visions of the good city and good citizen. The paper emphasizes that current projects of redevelopmentalism do not take place in politically inert or historically benign space. Rather, it is shown how historical and place-based specificities articulate with and mediate the process of redevelopmentalism in Kampala and Jinja.     

Supersudaca’s Asia Stories (aka at Home in the First,Second, Third,Fourth and Fifth Worlds)

The architecture network Supersudaca is best known for its research projects on Latin America and the Caribbean. Here they describe their experiences as they shifted their focus to Asia and the Middle East in a super-tour that took in Kuala Lumpur, Tokyo, Dubai, Mumbai, Dhaka, Phnom Penh, Singapore and China. Copyright © 2011 John Wiley & Sons, Ltd.     

Diurnal and seasonal variabilities in surface ozone and its precursor gases at a semi‐arid site Anantapur (14.62°N, 77.65°E, 331 m asl) in India

Measurements of surface ozone and its precursor gases (NO_x and CO) have been made at a semi‐arid site Anantapur (14.62°N, 77.65°E, 331 m asl) in tropical Indian region for the period, 2001–2003. NO_x and CO levels were the highest during morning and late night hours at this site. Diurnal variations of ozone concentrations varied from 25 ppbv to 50 ppbv and were observed to increase gradually after sunrise, attaining a maximum value by the evening and decreasing gradually thereafter. During monsoon months, the diurnal amplitude of ozone was found to be small (20–25 ppbv). Seasonal variation in ozone showed a pronounced maximum (40–50 ppbv) in the winter and summer. Local pollutants were major contributors to the ozone levels during this period. Ozone shows a yearly mean mixing ratio of about 35.9 ± 8.8 ppbv. The daytime concentration of CO and NO_x varied between 200 to 1200 ppbv and 3 to 20 ppbv respectively for the period studied. Annual average mixing ratios of oxides of nitrogen (NO_x) and CO were observed to be 3.9±0.6 ppbv and 436±64 ppbv, respectively.     

Effects of 17β-estradiol, and its metabolite, 4-hydroxyestradiol on fertilization, embryo development and oxidative DNA damage in sand dollar (Dendraster excentricus) sperm

Oxidative compounds have been demonstrated to decrease the fertilization capability and viability of offspring of treated spermatozoa. As estrogen and its hydroxylated metabolites readily undergo redox cycling, this study was undertaken to determine if estrogens and other oxidants could damage DNA and impair sperm function. Sperm was preexposed to either 17β-estradiol (E2), 4-hydroxyestradiol (4OHE2) or the oxidant t-butyl hydroperoxide (t-BOOH), and allowed to fertilize untreated eggs. The fertilization rates and development of the larvae were assessed, as well as the amount of 8-oxodeoxyguanosine (8-oxodG) as an indication of oxidative DNA damage. All compounds caused significant decreases in fertilization and increases in pathological abnormalities in offspring, with 4OHE2 being the most toxic. Treatment with 4OHE2 caused a significant increase of 8-oxodG, but E2 failed to show any effect. Pathological abnormalities were significantly correlated (r² = 0.44, p ≤ 0.05) with 8-oxodG levels in sperm treated with t-BOOH and 4OHE2, but not E2. 8-OxodG levels also were somewhat weakly correlated with impaired fertilization in 4OHE2-treated sperm (r² = 0.33, p ≤ 0.05). The results indicate that biotransformation of E2 to 4OHE2 enhances oxidative damage of DNA in sperm, which can reduce fertilization and impair embryonic development, but other mechanisms of action may also contribute to these effects.