Study-abroad programs are a ‘globalizing project’ developed at the intersection of educational institutions seeking new income sources and the ideologies that the world is comprised of a mosaic of cultures and that ‘intercultural experience’ is valuable. While research on study-abroad programs often focuses on their effect on the students’ ‘global competence’ and language proficiency, this article focuses on the space, the space of host family in particular, produced in study-abroad programs. Study-abroad programs here are perceived in a wide sense to include various programs for students to go to another country to study.
Study-abroad guidebooks and researchers portray the host family's life as constituting a quintessential ‘native life’, in which study-abroad students should be immersed. However, based on ethnographic fieldwork in Aotearoa/New Zealand, this article argues that the distinction between ‘cultural difference’ and ‘cultural sameness’ is a construction, resulting in mutual accommodation and intolerant judgments, respectively. That is, when host parents recognised the ‘cultural difference’ of the foreign students’ behaviour, they often sought to understand meanings behind the behaviour, resulting in mutual accommodation. It turned the space into what Michael Taussig calls the ‘space between’, in which it is unclear who is imitating whom. When the host parents recognised ‘cultural sameness’ based on superficial similarity, however, their efforts to understand meanings behind behaviour was halted and, when the behaviour was considered problematic, led to the student being asked to move out. This article details an ironic space of study abroad where alterity inspired tolerance and similarity inspired intolerance. 相似文献
MgADP binding to mitochondrial creatine kinase (mtCK) adsorbed on liposomes was induced by the photorelease of caged ADP. The nucleotide binding produced two types of structural changes. One was related to the well-established release of mtCK from the liposomes. The other corresponded to reversible structural changes induced by nucleotide binding to mtCK as demonstrated here. Infrared spectroscopy data show that the MgADP-induced desorption of mtCK from vesicles led to a slight increase in f -helix structures in mtCK at the expense of a small decrease in g -sheet structures and a concomitant increase in the fluidity of the membranes. The desorption of mtCK induced by MgADP and MgATP was almost complete, as shown by centrifugation and enzymatic activity measurements. The photorelease of MgADP in a reactive medium containing phosphocreatine and mtCK associated with liposomes led to nucleotide binding and to the formation of MgATP and creatine. Addition of phosphocreatine also desorbed mtCK from liposomes, while addition of creatine did not. Interpretation of these results would suggest that ADP, ATP or phosphocreatine induce the release of mtCK from membranes, increase the phospholipid bilayer fluidity, and may also decrease the number of contact sites between inner and outer mitochondrial membranes, thus affecting the activity of other mitochondrial enzymes. It is tempting to propose that membrane mtCK binding regulation by nucleotide and PCr concentrations may serve as a physiological adaptation for energy supply. 相似文献
Human serum albumin (HSA) is a potent inhibitor of Aβ self-association and this novel, to our knowledge, function of HSA is of potential therapeutic interest for the treatment of Alzheimer’s disease. It is known that HSA interacts with Aβ oligomers through binding sites evenly partitioned across the three albumin domains and with comparable affinities. However, as of this writing, no information is available on the HSA-Aβ interactions beyond domain resolution. Here, we map the HSA-Aβ interactions at subdomain and peptide resolution. We show that each separate subdomain of HSA domain 3 inhibits Aβ self-association. We also show that fatty acids (FAs) compete with Aβ oligomers for binding to domain 3, but the determinant of the HSA/Aβ oligomer interactions are markedly distinct from those of FAs. Although salt bridges with the FA carboxylate determine the FA binding affinities, hydrophobic contacts are pivotal for Aβ oligomer recognition. Specifically, we identified a site of Aβ oligomer recognition that spans the HSA (494–515) region and aligns with the central hydrophobic core of Aβ. The HSA (495–515) segment includes residues affected by FA binding and this segment is prone to self-associate into β-amyloids, suggesting that sites involved in fibrilization may provide a lead to develop inhibitors of Aβ self-association. 相似文献
In applied statistics it is customary to have to obtain a one‐ or two‐tail confidence interval for the difference d = p2 – p1 between two independent binomial proportions. Traditionally, one is looking for a classic and non‐symmetric interval (with respect to zero) of the type d ∈ [δL;δU], d ≤ δ0 or d ≥ δ0. However, in clinical trials, equivalence studies, vaccination efficacy studies, etc., and even after performing the classic homogeneity test, intervals of the type |d| ≤ Δ0 or |d| ≥ Δ0, where Δ0 > 0, may be necessary. In all these cases it is advisable to obtain the interval by inverting the appropriate test. The advantage of this procedure is that the conclusions obtained using the test are compatible with those obtained using the interval. The article shows how this is done using the new exact and asymptotic unconditional tests published. The programs for performing these tests may be obtained at URL http://www.ugr.es/~bioest/software.htm.相似文献
Theory is developed for the characterization of protein interactions by spectral techniques, where the constraints of constant temperature and pressure demand that thermodynamic activity be defined on the molal concentration scale. The customary practice of defining the equilibrium constant (K) on a molar basis is accommodated by developing expressions to convert those experimental values (Kmolar) to their thermodynamically more rigorous counterparts (Kmolal). Such procedures are illustrated by reanalysis of published results for the effects of molecular crowding agents on the isomerisation of α-chymotrypsin and reversible complex formation between catalase and superoxide dismutase. Although those reanalyses have led to only minor refinements of the quantitative interpretation, it is clearly preferable to adopt thermodynamic rigor throughout future spectral studies by employing the molal concentration scale from the outset. 相似文献