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  • [Erscheinungsort nicht ermittelbar] : eScholarship, University of California  (14)
  • 1
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2015
    DDC: 303
    Abstract: Sponsored search is a form of advertising where advertisers pay a search engine to show their ads on the search engine results page. The ads, also known as sponsored results, are chosen and presented to the user in response to a user query alongside organic search results. Sponsored search holds the promise of allowing advertisers to precisely target their ads to the large number of users of a search engine. The rise in use of search engines and the opportunity they provide to target ads using fine- grained criteria has led to a 20% annual growth in sponsored search revenues over the last decade. The targeting criteria chosen by an advertiser for their ads allow a search engine to deliver the ads to the right users. At the same time, it also puts the onus on the advertiser to identify the right ad targeting criteria. In this dissertation, we take a two-pronged approach to improve the effectiveness of sponsored search in delivering value to advertisers and improve the quality of results shown to users. First, we improve the ability of a search engine to interpret the targeting criteria specified by the advertiser. As part of the targeting criteria advertisers submit ad keywords which specify the user queries for which they would like to advertise. We leverage the search engine itself to interpret an ad keyword by submitting the ad keyword as an independent query. Using the search results of the ad keyword associated with an ad we determine if the ad is suitable for the original user query. We then analyze the effectiveness of different targeting strategies followed by advertisers. We develop a simple metric called net acquisition benefit (NAB) that admits comparisons between the efficacy of different ad targeting strategies. Using this metric, we conduct the first large-scale measurement of different targeting strategies used by advertisers--- measured in terms of incremental conversion gains. Considering data from a month in early 2015, we employ NAB to identify cases where these targeting strategies are justified
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  • 2
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2015
    DDC: 390
    Abstract: Along both sides of the Bolivian-Chilean border, the indigenous Aymara suffer from tuberculosis at much higher rates than white-mestizos. They also experience the illness differently. In this comparative and multi-sited study, I use qualitative methods to highlight these differences and demonstrate that they emerge from processes of structural violence, in particular institutional racism and precarity. I show that in Chile, while the Aymara face economic instability and political exclusion due to the state's neoliberal multicultural approach, they are also highly medicalized. In Bolivia, they benefit from an ongoing process of sociopolitical transformation towards decolonization which values their political membership, yet the state is structurally constrained from fully delivering biomedical antituberculosis treatment to Aymara communities. This produces contrasting ways of interpreting and signifying pain associated with tuberculosis. In Chile, patients engage with the biomedical treatment while in Bolivia, I argue that Aymara patients are able to contest treatment and resist medicalization by integrating the indigenous concept of suma qamaña (to live well) to their everyday struggles for achieving prosperity and health.Considering ethnopsychological theorization of emotions, I underline the role of both emotions and cultural conceptions of health in shaping the illness experience. I analyze Aymara notions of salir adelante (to come through) and prosperidad (prosperity) in relation to notions of health, economic prosperity, and emotional well-being. I discuss the particular associations that Aymara make between the individual illness experience and indigenous identity in both countries by looking at the traditional hydraulic- topographic model of the body, and the importance of wari (fat) in relation to samaña (breath), and ch'ama (physical energy), sweat, and work as key features of the framing of ujuk usu. I argue that renegar (bitterness/sadness) and compartir (community engagement) are linked to larger indigenous discourses of suma qamaña, which are currently decoded and enforced through decolonization policies in Bolivia and neoliberal multiculturalism in Chile. This dissertation advances the political dimension of the medicalization process and its relevance in understanding the embodiment of structural inequalities that transcend national borders
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  • 3
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2015
    DDC: 303
    Abstract: This dissertation examines how the medical profession adapts to social change by implementing reform at the medical school. The organization of the medical profession has changed rapidly over the past 60 years from a provider -driven to a buyer-driven system. Moreover, broader cultural shifts in the United States towards individualism and choice and away from traditional institutions of authority have reduced the medical profession's authority and autonomy. While medical sociology has documented how these changes impact practicing physicians, there has been little work to study how medical students are prepared to be practitioners in this environment. In this dissertation I reorient scholarly understandings of medical education from being nearly completely student-focused to looking instead at the environment the students are embedded in and how it is intentionally designed to produce a certain type of doctor. I argue that understanding what sort of doctor the medical school seeks to produce is key to understanding how the medical profession is adapting in harmony with larger changes in society. Through ethnographic research at a highly ranked medical school in the United States, this dissertation examines the process of epistemic boundary setting that is at the heart of learning the practices of doctoring and colleagueship central to being a physician. I show that faculty members are far more central to preclinical medical training than previously portrayed. I show how faculty members directly mediate the process of medical students taking on the physician's identity through being taught to execute the practices of doctoring and colleagueship. Because the faculty members situate their rationales for practice in the larger context of health care provision and their lived experience of the changes of the past 60 years, medical education serves as a window into contemporary professional practice and a venue in which to explore current physicians' opinions of what future physicians need to know in order to be successful in practice. The findings of this dissertation contribute to scholarship in medical sociology, sociology of medical education, and interdisciplinary studies of science and technology--- particularly the study of medical knowledge, epistemic cultures, and the reproduction of medical culture
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  • 4
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2014
    DDC: 303
    Abstract: Black hat search engine optimization (SEO), the practice of manipulating search results, has long been used by attackers to abuse search engines. In one such instance, search result poisoning, attackers siphon off large volumes of user traffic from organic search through organized efforts called SEO campaigns, and monetize the resulting traffic through scams ranging from sales of illicit goods to malware distributions. Entire ecosystems exist, each consisting of multiple campaigns poisoning on behalf of the same type of funding scam (e.g., counterfeit luxury goods). These campaigns are supported by two low- level mechanisms: poisoned search results (PSRs) and an SEO botnet. Disguised as a typical search result, PSRs in reality entrap unsuspecting users and direct them to scams. To prolifically generate PSRs, campaigns use an SEO botnet of compromised sites. Although interventions designed to disrupt search poisoning exist (e.g., demoting PSRs, seizing domain names), they tend to treat individual symptoms rather than address root causes. Thus, these reactive approaches are expensive and offer marginal benefit, leading to impractical and limited defenses. In this dissertation, I present a framework to understand and address the root causes of search result poisoning. In support, I analyze search poisoning from three perspectives: PSRs, SEO botnets, and an ecosystem. Additionally, I synthesize insights acquired while examining lower-level mechanisms (PSRs, SEO botnets) into a comprehensive understanding capable of impacting the attacker's high level operation -- their SEO campaign. From the point-of-view of PSRs, I explore modern cloaking to characterize the role of this black hat SEO technique in supporting PSRs. Then, by infiltrating an SEO botnet, I characterize the composition of an SEO botnet and how attackers generate PSRs at large scale. Lastly, I evaluate the effectiveness of current interventions in disrupting SEO campaigns found in the counterfeit luxury goods ecosystem. In the end, I present a bottom-up" approach to understanding and addressing the root causes of search result poisoning. Using a framework constructed from my analyses of lower-level mechanisms, I provide a methodology for identifying campaigns and their infrastructure that provides the improved targeting required for more robust, comprehensive, and systematic intervention"
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  • 5
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2013
    DDC: 390
    Abstract: This thesis explores the imaginary in the marketing of integrated medicine in China through an analysis of an episode of the television show, Health Appointment" ("Jiankang Youyue"), which airs on CCTV (China Central Television), the primary state television broadcaster within the People's Republic of China. Primarily, I seek to address how the self is implicated in the imaginary of integrated medicine and, ultimately, show how the notion of a `genetic self' emerges as an attempt to resolve the issues of subjectivity faced by persons diagnosed with mental illness. The `genetic self' integrates Five Phase Theory into biomedical notions of the 'neurochemical self' (cf. Rose 2003) and, in doing so, indicates that, in the intersection of biomedicine and traditional Chinese medicine (TCM), biomedicine is not entirely hegemonic. Relating this to economic, historical, and political processes, I show that globalization consists of reciprocal processes in which traditional Chinese medicine is not replaced, but rather reinterpreted, and biomedicine is reformulated in accordance with traditional medical beliefs. The repeated emphasis on a cure throughout the promotion of `Five Phase Balance Regulation Therapy' on "Jiankang Youyue" illustrates how TCM and biomedicine are both reformulated through the integration of the two cultural systems of medicine"
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  • 6
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2012
    DDC: 303
    Abstract: Modern unsolicited bulk email, or spam, is ultimately driven by product sales: goods purchased by customers online. While this model is easy to state in the abstract, our understanding of the concrete business environment--- how many orders, of what kind, from which customers, for how much---is poor at best. This situation is unsurprising since such sellers typically operate under questionable legal footing, with ground truth data rarely available to the public. However, absent quantifiable empirical data, guesstimates" operate unchecked and can distort both policy making and our choice of appropriate technical interventions. This dissertation presents new methodologies for and results from experiments that characterize and quantify the economics of email based scams. The methodology relies on infrastructure infiltration to gain a view of the mechanisms and revenues of these operations from the point of view of the perpetrators themselves. Through multiple research efforts, we are able to capitalize on the weaknesses of the perpetrators' security to collect information that provides insight into the way these scams work. The first effort investigates the proportion of spam recipients that act upon the spam messages they receive - the "conversion rate" of spam. Using a parasitic infiltration of an existing botnet's infrastructure, we analyze two spam campaigns comprised of nearly half a billion email messages : one campaign designed to propagate a malware Trojan, the other campaign marketing on-line pharmaceuticals. We identify the number that are successfully delivered, the number that pass through popular anti-spam filters, the number that elicit user visits to the advertised sites, and the number of "sales" and "infections" produced. The second effort uses two inference techniques to peer inside the business operations of spam-advertised enterprises : purchase pair and basket inference. Using these methodologies, I provide informed estimates on order volumes, product sales distribution, customer makeup and total revenues for a range of spam-advertised businesses. The results from these studies demonstrate that infiltration of Internet criminal infrastructure allows collection of useful information that can improve our understanding of the operations and economics of adversaries on the Internet. This information informs both technical and policy based defenses so that they can take into consideration the business realities of economically motivated Internet adversaries"
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  • 7
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2012
    DDC: 390
    Abstract: Based on two years of ethnographic research on the transformation of people's emotional lives in clinical and non-clinical settings, this dissertation examines the emerging sources, forms, and subjects of anxiety in post- reform Ho Chi Minh City, Vietnam. Since Vietnam's neoliberal reforms were initiated in 1986, many Ho Chi Minh City residents have benefited from a vastly increased standard of living yet reported worrying more now than ever before. This stands in marked contrast to a past when, according to many, extreme suffering stunted people's spirits as much as their bodies. Anxiety has become emblematic of neoliberalism's opportunities and risks in people's public and private lives, yet to worry is a key means through which individuals enact forms of personhood based on care, compassion, and filial obligation. Against claims that increased rates of anxiety and anxiety disorders are the products of modernization and the subsequent erosion of social institutions, I conceptualize worry as a cultural practice through which people can both transform themselves into neoliberal subjects and define themselves in terms of sentiment and emotional relatedness that are considered to be traditionally Vietnamese. I analyze how anxiety is articulated by cultural discourses, and vice versa, across a wide range of domains associated with the neoliberal era, including biomedical psychiatry, romance, and leisure. Recent scholarship on neoliberal modes of modernity has called attention to affective practices and relationships of sentiment as a medium linking structural transformations and subject formation. However, such studies rarely examine how the experience of these practices and relationships come to be understood as specifically emotional themselves, a process that is crucial to subject formation in Vietnam's transition to a market-oriented economy. Bringing together phenomenological and political theories of anxiety that frame it alternatively as an existential condition of humankind or the inevitable fallout of modernity's freedoms and choices, I examine the meanings and experiences of normative and pathological anxiety and the cultural forms that are marshaled to deal with potential threats--threats that may be more pressing than what has already transpired--in a society increasingly suffused with market imperatives
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  • 8
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2010
    DDC: 390
    Abstract: This dissertation is about the social and psychocultural dimensions of medical pluralism and treatment seeking in Santarém, a rapidly growing municipality in the Brazilian Amazon. Based on a year-and-a-half of ethnographic fieldwork in urban and rural settings, it comparatively examines how popular religions and cosmopolitan health institutions define and manage (or fail to manage) sickness, psychosocial impairment, and emotional distress. It also reveals lived experiences of informants who seek out these therapeutic options and the processes through which quests for healing shape personal understandings of affliction and selfhood. This study contributes to emerging scholarship in anthropology that theorizes medical pluralism, not in terms of discrete cultural systems set in opposition to one another (e.g., traditional versus cosmopolitan medicine), but rather as an open system of dynamic relations between institutions and between institutions and care-seekers. This dissertation situates these processes within broader historical trends in the Amazon that have lead to significant patterns of urbanization, migration, and sociocultural complexity, contrary to popular stereotypes of the region. In this context, religious institutions such as Pentecostalism, Spiritism, Candomblé, and Umbanda have flourished and, along with secular health institutions, provide diverse social and symbolic resources for the needs of care-seekers. However, an examination of the ways that santarenos in these communities cognize illness and distress and seek care reveals how blurred the boundaries are between institutional ideologies and therapeutic practices. These domains are characterized as much by complementarity as by contradiction. In similar light, individual treatment seeking efforts do not unfold in any clear-cut fashion. Rather, informants find themselves caught up within epistemic entanglements, as they navigate moral worlds oriented to medicalized care, ritual forms of healing, and spirit mediumship. Case studies convey personal dilemmas that emerge from these entanglements, in which individuals strive to regain control of symptoms, of self- and social efficacy, and moral development. Psychocultural theories, including the work of culture and embodiment, provide a framework for understanding how differing cultural idioms articulate with these life-course themes, emotions, and sensory experiences, which together underpin expressions of flexibility in selfhood in response to social conditions of pluralism
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  • 9
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2010
    DDC: 390
    Abstract: The focus of the current ethnographic study is a neo- shamanic healing ritual, practiced by contemporary Euro- Americans in the west coast of the United States, called soul retrieval. Moving away from symbolic, interpretive or representational approaches to the study of ritual healing, this study offers an experientially specific account of neo-shamanic healing process that is grounded in embodiment. The ritual healing practice of soul retrieval is formulated here as a process of self-transformation and self-objectification, which is facilitated vis-à-vis a series of relationships that are created throughout the healing ritual and extend beyond it. The effort made in this paper is bifocal, in the sense that it attempts to elaborate on embodiment as a paradigm for anthropology by drawing on a particular ethnographic instance, while at the same time contribute to the anthropological literature on ritual healing and therapeutic process from an analytical perspective grounded in embodiment
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  • 10
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2009
    DDC: 390
    Abstract: This dissertation interrogates the complexity of late 20th and early 21st century racial projects, focusing on conflict and convergence among African Americans, Cuban exiles, and Afro-Cubans in the United States. A textual analysis of the African American Miami Times and the Spanish language El Herald/El Nuevo Herald during the 1980 Mariel exodus and 1994 Balsero crisis, reveals the concerns of Miami African Americans and Cubans related to issues of race, immigration, and national belonging. The dissertation argues that the racializing discourses found in the Miami Times, which painted Cuban immigrants as an economic threat, and discourses in the Herald, which affirmed the presumed inferiority of blackness and superiority of whiteness, reproduce the centrality of ideologies of exclusivity and white supremacy in the construction of the U.S. nation. These discourses rely on three principle racializing frames: the black/white frame, the morality framing of good and bad citizens, and the native/foreigner dichotomy. Despite often antagonistic attitudes between African Americans, exile Cubans, and newer Cuban immigrants, however, the findings expose a shared underlying critique of the continued disenfranchisement of people of color. The analysis of newspaper text is supplemented by an analysis of talk, i.e., in-depth interviews conducted with black Cubans from Miami and Los Angeles, in order to understand their negotiations of the U.S. racial structure. The experiences that Afro-Cubans recount contradict the tenets of exclusivity upon which definitions of authentic" U.S. citizenship rests, and their positioning as blacks and as Cubans challenges the notion that African American and Cuban American communities are bounded, racially distinct groups. The dissertation makes the case that we must root out and expose white supremacy in all its covert manifestations, in order to understand interethnic conflict more broadly, and Black/Latino conflict specifically. Though the study focuses on Miami and Los Angeles, it has national implications, as it concerns the ways in which the power of whiteness prevails even as the nation's population shifts from majority white to "majority minority."."
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  • 11
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2009
    DDC: 390
    Abstract: As day laborers continue to seek work in suburban communities throughout Southern California, the reaction of cities and communities to presence of this new immigrant labor group is varied and complicated. Reactionary policies representing a nativist backlash to the presence of poor Latino male immigrants within traditionally upper and middle class native populations underscore the sense of fear and loss that demographic changes create within native populations In the absence of national policy outlining the role of local government agents in the policing of immigrants, hyper-visible day laborers operating within the races spaces of Southern California bear the brunt of anti-immigrant sentiment at the local level, witnessed through the rising levels of restrictionist day labor ordinances.
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  • 12
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California 2006
    DDC: 390
    Abstract: My thesis, in one sentence, is that the entire political discourse in Denmark (and in many parts of Europe) has moved to the right through the debate on immigration in the last two decades. The left/right distinction is pushed to the background and a cultural one - the Danish people" /the Muslim immigrant - has come to the forefront as the main dividing line. This means that the redistribution of resources is discussed as a matter of ethnicity and culture rather than other types of social identifications (e.g. class or gender). In short, a new basis for identification has become hegemonic through the articulation of a new internal division based on culture. The hegemonic change was the result of the nationalist/ racist Right's populist intervention in the mid 1980s. Large sections of society did not feel that their concerns and demands were represented by the political system. In an environment of such profound displacement, it was relatively easy for the populist right to point to immigration as the main threat to society (associated with the welfare system) and to articulate an antagonism between the people (silent majority) and the political and cultural elite that let immigration happen. The new hegemony is based on a culturalized ontology of the social. The (re)production of immigrants as a threatening force is maintained through a constant focus on cultural issues that are considered as anti-society. In many parts of Europe, cycles of moral panics are created around issues such as honor killings, gang rapes, animal slaughter, violence, female genital mutilation, forced marriages and headscarves. These issues produce repeatedly an unbridgeable divide between Muslim (immigrant) and Danish culture. The orientation towards these issues disperses various social and political actors along the antagonistic divide, often creating insolvable tensions and fractions within social movements. Reproducing a left/ right opposition - regardless of its particular content - is what is at stake. The answer to the populist vision of society is the construction of a new type of hegemony: the strategy or ideal for a future world should be the re- ontologization of the social"
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  • 13
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California
    DDC: 390
    Abstract: This dissertation ethnographically examines the dynamic relationship between cultural change, psychiatry, and subjective experience among women in Morocco. Over the past fifteen years, unprecedented socio-economic reform in this postcolonial Muslim society has unsettled local gender norms : a lively public debate now questions what place traditional" female roles should have in a "modern" civil society, and what constitutes "authentic" Moroccan womanhood. Drawing on two years of fieldwork in the political capital of Rabat, including a fine-grained clinical ethnography of a psychiatric hospital in the city's outskirts, I analyze popular media discourse, clinical treatment practices, and subjective experiences of illness among female inpatients to ask : 1) how Moroccan psychiatry engages with this media-driven debate about modernity and authenticity, 2) how this engagement in turn shapes clinical approaches to the treatment of female patients, and 3) how these patients experience the confluence of psychological and social upheaval in their lives. Taking these three levels of analysis together, I argue that psychiatric diagnoses create a space to question normative notions of cultural authenticity and offer an opportunity for the construction of new meanings and moralities that are both "modern" and "authentic." Both in the public realm of popular media and in the private realm of clinical treatment, psychiatrists employ diagnostic categories not only to identify individual suffering, but also to question the health of society as a whole. While claiming psychiatry as an authentic part of Morocco's cultural heritage, these clinicians offer scientifically validated notions of mental health as the basis for new, "modern" definitions of moral and authentic personhood. By analyzing therapeutic approaches to hysteria and borderline personality disorder, two diagnoses that are commonly and near-exclusively applied to women, I show that treatment becomes an opportunity to cultivate new traits that are defined as "modern" and "healthy," yet also culturally "authentic." For female patients, too, illness creates an opportunity to negotiate with normative moralities. Given few acceptable resources to resist social expectations and pursue alternative identities, the pain of illness can in fact offer women an agentive way to voice protest and claim identities that are both personally and culturally meaningful"
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  • 14
    Online Resource
    Online Resource
    [Erscheinungsort nicht ermittelbar] : eScholarship, University of California
    Language: Undetermined
    Dissertation note: Dissertation eScholarship, University of California
    DDC: 306
    Abstract: Anthrax is a fatal disease caused by the spore-formulating bacterium, Bacillus anthracis. The potential for anthrax as a bioterrorist weapon raises concern, and is still common in the developing world. Antibiotic treatment of anthrax is often not effective, because toxins released in the host bloodstream can cause death even after clearance of the bacterium. Thus, it is important to further develop our knowledge of how anthrax causes its deadly effects as well as develop treatments targeting the toxins themselves. The anthrax toxin edema factor (EF) is a calmodulin-dependent adenylate cyclase and lethal factor (LF) is a zinc metalloprotease, which cleaves and inactivates MAPKKs. Like many other bacterial toxins, their activity targets conserved cellular components, making it possible to study their activity using an invertebrate model such as Drosophila. Using UAS-EF and UAS-LF transgenic lines, an extensive interaction screen with candidate UAS lines was used to identify novel targets for toxin activity. EF and LF showed synergistic interaction with Rab11 GTPase, a recycling endosome regulator, and its exocyst binding partner Sec15. Also, loss of other exocyst components Sec5, Sec15, and Exo70 enhanced the severity of the LF phenotype. Two other candidates, CG5745 and CG17282, disrupt the exocyst through their action on Sec15 and possibly Rab11. Increased knowledge of toxin activity in the long run may prove to be useful in rational drug design. Furthermore, as a more direct approach to treatment development, I conducted a genetic screen, which generated two dominant negative mutants of lethal factor
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