176 research outputs found
Anaerobic benzene degradation in culture and hydrocarbon degradation in the subsurface environment
No full textUnderstanding of microorganisms and pathways involved in anaerobic benzene degradation is limited. Stable isotope probing of DNA was used to identify key members of a previously characterized, sulfate-reducing benzene degrading consortium. DNA extracts of cultures incubated with [13C6]- or [12C6]benzene were separated into 13C- and 12C-labeled fractions by CsCl density gradient centrifugation. Sequencing and Terminal Restriction Fragment Length Polymorphism (T-RFLP) analysis of the 16S rRNA gene identified TRF 270 (bp), a Desulfobacterium like phylotype, which was first to derive the bulk of the 13C label for DNA synthesis, and is thus likely involved in activation of benzene degradation.
To understand the pathway of anaerobic benzene metabolism, degradation and inhibition tests were used. Based on these tests toluene was eliminated, and benzoate was identified as a possible intermediate. Metabolites detected in cultures amended with [13C6]benzene or [13C6]phenol indicate that in this consortium there are 2 different pathways of benzoate formation, one forms universally labeled ([13C-UL]benzoate), and the other forms ring labeled benzoate. Pathway that forms [13C-UL]benzoate is dominant during benzene degradation in which the benzene ring is carboxylated by a carbon derived from another benzene ring. This pathway is different from the proposed pathway of benzene degradation via phenol, as the labeling pattern of 13C-labeled benzoate formed from [13C6]benzene or [13C6]phenol is not identical. In conclusion, a novel pathway that activates one benzene ring through its reaction with products of another benzene ring likely exists in this consortium.
Groundwater impacted by a manufacturing gas plant site was used for detection and quantification of metabolic intermediates of polycyclic aromatic hydrocarbons and gene analogues encoding alpha subunit of benzylsuccinate synthase (bssA), as evidence for natural attenuation. Highest concentrations of metabolic intermediates of anaerobic naphthalene and 2-methylnaphthalene degradation were detected in an impacted monitoring well (MW)-24, near the source. Quantitative analysis of 16S rRNA gene indicated that bacterial population was enriched in the impacted wells, while bssA gene containing bacterial community was enriched in MW-24. Detection of not one, but two different indicators specific to the presence and activity of microorganisms provides strong evidence for in situ anaerobic microbial processes.Ph.D.Includes bibliographical referencesby Amita R. Ok
Amita Baviskar. Uncivil City: Ecology, Equity and the Commons in Delhi. 2020, Sage and Yodapress.
No full textAmita Baviskar’s latest book titled Uncivil City: Ecology,
Equity and the Commons in Delhi provides an in-depth analysis of
exclusion of the Commons from the socio-economic and political spaces of
inarguably India’s most powerful city; Delhi. The book is divided into
three sections with eights chapters encompassing book’s themes. It
starts with setting the context by explaining the reasons for titling
the book as ‘Uncivil City’. Conceptualising Delhi as Uncivil expounds
the City’s changing spatial dynamics which the author has detailed by
analysing City’s social history by doing socio-historical analysis. She
also reminisces her early-life experiences with the City; what the City
was for the Commons in the past; how infrastructural development has
excluded the Commons; what the City’s formal politics and politicised
environment is doing to the Commons and what does future entail for
them
Some Biological Characteristics of River Yamuna at Agra
No full textThe biological characteristics of the River Yamuna at Agra were studied in terms of Planktons. It was found that Yamuna waters have a distribution of planktons; phytoplanktonic forms (microflora) and zooplanktonic forms (microfauna), bottom and marginal fauna and fish fauna at different sampling stations. The microflora and microfauna have been described here. It was found that mostly the microflora is represented by the members of three main families of algae viz. Chlorophyceae, Myxophyceae and Bacillariophyceae in the Yamuna River waters at different sampling stations. The microfauna is represented by the planktonic forms of Protozoa, Rotifera and Crustaceans
Representations of migrant and nation in selected works of Rohinton Mistry and Salman Rushdie
No full textThis thesis explores the representations of, and the relationship between. the migrant and the nation in selected works of the Bombay-born novelists Rohinton Mistry and Salman Rushdie. I explore each writer's engagement with contemporary debates surrounding the material, political, social and imaginative consequences of the crisis in secularism in India during the 1970s, 1980s and 1990s, and consider how this engagement is informed by their
migrant positions beyond India's borders. A primary concern is the way in which Mistry's and Rushdie's representations of the nation, and of migrant and diasporic subjects, intersects with the representation of Bombay in their work.
This thesis is divided into five chapters. The first two chapters concentrate on Mistry's fiction, the remaining three on Rushdie's work. Published between 1988 and 2002, the central novels examined are situated within debates regarding the founding principles of the Indian nation, and notions of Indianness, the rise of communalism in general and Hindu nationalism in particular, and the renaming of Bombay as Mumbai. My readings foreground the necessity of a
close understanding of the historical and political transformations taking place within Bombay and India during the 1970s, 1980s and 1990s, but also during the 1950s and 1960s. I argue that Mistry's and Rushdie's work is informed by a deepening anxiety over these socio-political transformations, and over how reconfigurations of Indianness increasingly position minority communities, and migrant and diasporic subjects, outside of definitions of national identity.
This anxiety extends into the negotiation of their own migrant positions. My reading of the differing representations of the migrant in Mistry's and Rushdie's work engages with ideas of accountability, political responsibility, and with notions of cosmopolitanism. In doing so, I question familiar assumptions regarding the migrant condition as one of predominantly empowering political agency. I argue that, while both authors emphasise the importance of the migrant sustaining a critical engagement with India's politics, they also foreground the anxious difficulties of doing so. This difficulty informs Mistry's and Rushdie's divergent negotiation of their own position as migrant writers, and I examine how their fiction is marked by an anxiety over the adequacy of writing as a mode of political engagement with the crisis in secularism and the parochialisation of Bombay, and as a means of negotiating the politics of migrancy
Partition asymptotics; zeros of zeta functions; and Apéry-like numbers
No full textPART I
G. H. Hardy and S. Ramanujan established an asymptotic formula for the number of
unrestricted partitions of a positive integer, and claimed a similar asymptotic formula for
the number of partitions into perfect kth powers, which was later proved by E. M. Wright.
Recently, R. C. Vaughan provided a simpler asymptotic formula in the case k = 2. In the
first part of the thesis, we study the number of partitions into parts from a specific set
Ak(a0; b0) :={mk : m 2 N;m _ a0 (mod b0)}, for fixed positive integers k, a0; and b0. Using
the Hardy-Littlewood circle method, we give an asymptotic formula for the number of such partitions, thus generalizing the aforementioned results of Wright and Vaughan. We also consider the parity problem for such partitions and prove that the number of such partitions is even (odd) infinitely often, which generalizes O. Kolberg's theorem for the ordinary partition function. This material builds on the joint work with B. C. Berndt and A. Zaharescu.
PART II
The Riemann Hypothesis implies that the zeros of all the derivatives of the Riemann-_
function lie on the critical line. Results on the proportion of zeros on the critical line of derivatives of _(s) have been investigated before by B. Conrey, and I. Rezvyakova. The percentage of zeros of _(k)(s) on the critical line approaches 100% percent as k increases. The second part of this thesis builds on the joint work with S. Chaubey, N. Robles, and A. Zaharescu. We study the zeros of combinations of derivatives of _(s). Although such combinations do not always have all their zeros on the critical line, we show that the proportion of zeros on the critical line still tends to 1.
PART III
The third part of this thesis focuses on the work on Apéry-like numbers joint with Armin
Straub. In 1982, Gessel showed that the Apéry numbers associated to the irrationality of
_(3) satisfy Lucas congruences. Our main result is to prove corresponding congruences for all known sporadic Apéry-like sequences. In several cases, we are able to employ approaches due to McIntosh, Samol-van Straten and Rowland-Yassawi to establish these congruences. However, for the sequences labeled s18 and (_) we require a finer analysis. As an application, we investigate modulo which numbers these sequences are periodic. In particular, we show that the Almkvist-Zudilin numbers are periodic modulo 8, a special property which they share with the Apéry numbers. We also investigate primes which do not divide any term of a given Apéry -like sequence.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-08-01The student, Amita Malik, accepted the attached license on 2017-07-13 at 10:11.The student, Amita Malik, submitted this Dissertation for approval on 2017-07-13 at 10:40.This Dissertation was approved for publication on 2017-07-13 at 13:58.DSpace SAF Submission Ingestion Package generated from Vireo submission #11450 on 2017-09-29 at 11:19:20Made available in DSpace on 2017-09-29T17:52:21Z (GMT). No. of bitstreams: 2
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A qualitative study with second-generation South Asian adolescent girls and their parents : an exploration of intergenerational differences in acculturation and its links with depression
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Irrigation, gender and poverty: overview of issues and options
No full textIrrigated farmingLaborPovertyFarming systemsWomenFarmersIncomeHouseholdsGender
The sense of Chengdu: embodied heritage in tastescape
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Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system"Chengdu is famous for its Sichuan Cuisine with its unique spicy flavor. From the sources distributed and transported to local restaurants, then prepared, served, and eventually eaten by consumers, food is a significant part of Chengdu's culture. Eating is not only just about the food itself, but also about where to eat, how to eat, when to eat, whom to eat with. Culinary heritage is proposed to be conserved through the concept of ""tastescape"", which is planned as a combination of landscape and culture in which eating becomes a situated event. The design study focuses on the streets in historic neighborhoods in the inner city of Chengdu. The relationship between food, landscape and culture, and tastescape is proposed by combining eating with participating in theaters, local artworks, and cooking."Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-08-01The student, Linna Yi, accepted the attached license on 2016-07-21 at 14:46.The student, Linna Yi, submitted this Thesis for approval on 2016-07-21 at 15:13.This Thesis was approved for publication on 2016-07-22 at 09:52.DSpace SAF Submission Ingestion Package generated from Vireo submission #10042 on 2016-11-10 at 12:27:36Embargo set by: Seth Robbins for item 95396
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