To understand the ‘osmorespiratory compromise’ (the trade-off in gill function between ion and respiratory gas exchange) during hypoxia in freshwater fish, a species-specific approach was utilized where general ionoregulatory responses to hypoxia were compared in rainbow trout (Oncorhynchus mykiss, a hypoxia-intolerant freshwater fish), and in two hypoxia-tolerant species (the goldfish Carassius auratus and the Amazonian oscar Astronotus ocellatus). In the latter two species, the dual stress situation of hypoxia plus feeding was also explored. Measurements included unidirectional and net Na^+ flux rates, ammonia excretion rates, net K^+ loss rates, branchial Na^+/K^+- ATPase and H^+- ATPase activities, and branchial morphology by scanning electron microscopy (trout and oscar only). In trout, environmental hypoxia induced complex changes in gill ionoregulatory function, where the direction and magnitude varied with both the extent and duration of the hypoxia regime. The changes in ion-regulation observed in trout in response to hypoxia indicated that the osmorespiratory compromise in this hypoxia-intolerant species was different and more complex compared to its manifestation in oscar and goldfish. This could be attributed to the adaptive physiology of the trout to oxygen-rich environments and its intolerance to low environmental oxygen availability. In both of the hypoxia-tolerant species (oscar and goldfish), there was a general reduction in gill permeability in response to severe hypoxia regardless of feeding regime, rather different from the complex patterns seen in the hypoxia-intolerant trout. However, the effects of feeding on this phenomenon differed between these species. Fed goldfish had elevated branchial fluxes that were effectively turned down during hypoxia compared to baseline flux rates maintained by starved goldfish. In contrast, fed oscars had lower fluxes compared to starved fish. Although both fed and starved fish suppressed their branchial fluxes with severe hypoxia, fed oscars delayed the turning down of fluxes. Overall, our results indicate that feeding exerts opposite effects on gill ionoregulatory function in these two hypoxia-tolerant species, and thereby differentially modulates the responses to hypoxia. These differences may relate to differences in water chemistry. Furthermore, the manifestation of the osmorespiratory compromise during hypoxia appears to be rather different from the phenomenon during exercise. / Thesis / Master of Science (MSc)

Thesis (Ph. D.)--UCLA, 2008. / Vita. Includes bibliographical references.

Thesis (doctoral)--Universität Giessen.

Thesis (doctoral)--Johannes Gutenberg-Universität in Mainz.

Chen, Meichen. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 34-37). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts also in Chinese.

The main goal of cryptography is to enable secure communication over a public channel; often a secret shared among the communicating parties is used to achieve this. The process by which these parties agree on such a shared secret is called key agreement. In this thesis, we focus on two-party key agreement protocols in the public-key setting and study the various methods used to establish and validate public keys. We pay particular attention to certificateless key agreement schemes and attempt to formalize a relevant notion of security. To that end, we give a possible extension of the existing extended Canetti-Krawzcyk security model applicable to the certificateless setting. We observe that none of the certificateless protocols we have seen in the literature are secure in this model; it is an open question whether such schemes exist. We analyze several published certificateless key agreement protocols, demonstrating the existence of key compromise impersonation attacks and even a man-in-the-middle attack in one case, contrary to the claims of the authors. We also briefly describe weaknesses exhibited by these protocols in the context of our suggested security model.

The main goal of cryptography is to enable secure communication over a public channel; often a secret shared among the communicating parties is used to achieve this. The process by which these parties agree on such a shared secret is called key agreement. In this thesis, we focus on two-party key agreement protocols in the public-key setting and study the various methods used to establish and validate public keys. We pay particular attention to certificateless key agreement schemes and attempt to formalize a relevant notion of security. To that end, we give a possible extension of the existing extended Canetti-Krawzcyk security model applicable to the certificateless setting. We observe that none of the certificateless protocols we have seen in the literature are secure in this model; it is an open question whether such schemes exist. We analyze several published certificateless key agreement protocols, demonstrating the existence of key compromise impersonation attacks and even a man-in-the-middle attack in one case, contrary to the claims of the authors. We also briefly describe weaknesses exhibited by these protocols in the context of our suggested security model.

Thesis (J.S.D.)--Stanford University, 2006 (leaves 342-377). / Submitted to Stanford Law School. "December 2005."

Thesis (doctoral)--Universität Bern, 2009. / Includes bibliographical references (p. xxix-lix).

abstract: During 1947-1948, three commercial films: Everlasting Love( 1947) Long Live the Wife (1947) and Happiness and Sorrow of Middle Ages (1948) from the director Sang Hu were released. Although the results from box-office were stunning, they suffered fierce criticism from progressive critics largely because the films lacked descriptions of China as a nation-state with critical explorations on nationalism, anti-imperialism, and feudalism. This ideological bias resulted in a long time neglect of the artistic and social value of these three films. This paper attempts to analyze the directors original intention through the love story vehicle, illustrate his concern toward individuals, society, urban culture and moral standards and further discuss this new film genre through a comparison of today's film market. In my opinions, his films contain considerable artistic and social values which deserve scholarly attentions. They show great compassion toward the dilemma of ordinary human beings and privilege the perspectives of common citizens; The director depicts various kinds of interpersonal relationships in a semi-colonial city and thus demonstrates considerable concern with the social realities. In their particular political environment, these films negotiate the economic market and yet successfully contribute their own intervention in the wider cultural discussion of post-war social reconstruction and the development of ethical values. / Dissertation/Thesis / M.A. East Asian Languages and Civilizations 2012