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This paper explores the field of museum interactions with a specific focus on the introduction of smell as a means to communicate the objects on display and create more memorable museum visits. Through literature, research, focus groups, and a substantial ideation phase I have found problems and design openings in the exhibition room. These, I have addressed by creating and testing a set of three olfactory display prototypes in the exhibition, all with a scent fitting not only the objects but also the exhibition room as a whole. The introduction of these interactive olfactory displays has resulted in a change in how the exhibition was perceived and what the visitors took with them from the experience. This is an exploration into a new and unknown field, contributing to the field of museums as well as the general field of smell interaction in space. It is also an exploration into how museum visits can be made more memorable by using the incredible ability of smells to spark associations and memories.

Members of the class Mammalia have the most advanced skeletal complexity of the nasal cavity among vertebrates. Most mammals have an olfactory epithelium that consists of basal cells, supporting cells and olfactory sensory neurons that bind odor molecules with their cilia. The olfactory epithelium is responsible for detecting odor stimuli. The surface area of olfactory epithelium varies greatly among species. Carnivores have a generally larger surface area of the olfactory epithelium than primates and ungulates of the same size. Modern odontocetes lack olfactory epithelium. To get an overview of the between-species differences of the olfactory epithelium surface area and number of olfactory receptor cells, a search of the scientific literature was performed, using the database Web of Science and references from the scientific articles. The assembled data were entered into two tables, one that contains species names, surface area of the olfactory epithelium and references, and another that includes the total number of olfactory receptor cells for the few species that have been studied in this respect so far. Methods of measuring olfactory epithelium size differ, some studies used immunohistochemistry, other measured osteological proportions, like the surface area of the olfactory turbinals. A compilation of the published data provides an overview of the range that the size of the olfactory epithelium can have and allows for between-species comparisons of this anatomical measure as well as for assessing possible correlations with olfactory capabilities.

京都大学 / 0048 / 新制・課程博士 / 博士(理学) / 甲第19534号 / 理博第4194号 / 新制||理||1602(附属図書館) / 32570 / 京都大学大学院理学研究科生物科学専攻 / (主査)教授 髙林 純示, 教授 永益 英敏, 教授 石田 厚 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DGAM

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Olfactory identification deficits have received recent attention as a potentially useful endophenotype for schizophrenia. Examination of this deficit in individuals with schizotypal personality features (SPF) offers an alternative approach to multiple confounds present when examining individuals with schizophrenia. The aim of the current study was to compare the relative sensitivity of performance on measures of olfaction identification and sustained attention to the presence of SPF. Twenty-six undergraduates were defined as having SPF based on scoring in the top 10% of the Abbreviated Schizotypal Personality Questionnaire (SPQ-B; mean age 19.6, SD = 1.1; 62% female). These individuals were compared to twenty-six controls (scoring lower than half a standard deviation above the mean; mean age 19.8, SD = 1.6; 62% female). All participants were administered the Schizotypal Personality Disorder (SPD) section of the Structured Clinical Interview for DSM IV Axis II Personality Disorders (SCID-II). In addition, participants were administered the Brief Smell Identification Test (B-SIT) and a six-minute degraded-stimuli Continuous Performance Test (CPT). Group differences in performance indices of the CPT did not approach statistical significance. Similarly, there were no statistically significant group differences for males or females in performance on the B-SIT. Correlational analyses examined cognitive performance with a dimension score derived by summing quantitative ratings from the SPD items on the SCID-II. The SPD dimension score showed a statistically significant positive correlation with several performance indices of the CPT, including omission errors (rs(52) = .51, p ≤ .001) and commission errors (rs(52) = .38, p ≤ .005). In contrast, the B-SIT scores were not correlated with the SPD dimension score for males or females. Contrary to our hypothesis, results from the current study suggest that olfactory identification deficits may not represent a robust endophenotype consistently found in samples with schizotypal personality features. With regard to sustained attention, our differential findings suggest that schizotypal traits may be more adequately assessed through an interview by trained clinicians who use clinical judgment to determine the presence of phenotypic aspects of SPD (e.g., SCID-II), rather than relying on self-report measures (e.g., SPQ-B). Implications as well as limitations and future directions of these findings are discussed.

Many insects rely on olfaction as their primary method of interaction with their environment. One of the best examples of this is the olfactory driven host-seeking behavior displayed by female mosquitoes. Although mosquitoes are capable of extracting blood from a variety of hosts many mosquito species show marked preferences for particular host species. Mosquitoes displaying preference for humans above bovines are more likely to be disease vectors. Therefore understanding the molecular basis of this preference is important for public health. These differences may be the result of genetic variations in olfactory signaling components such as mosquito odorant receptors. This hypothesis is supported by several lines of evidence including the highly divergent and lineage-specific nature of this receptor family. Likely these differences are subtle and will be identified in highly focused studies. Even closely related sibling species of mosquitoes can display large behavioral differences. In our current study I have studied several aspects of both Anopheles and Aedes genus odorant receptors with emphasis on comparing receptors in species that are part of the Anopheles genus. The first goal of this project was to study the insect odorant receptor family for potential sites of heterodimer formation. Numerous studies have shown that insect odorant receptors are involved in detection of odorants. More recent studies have demonstrated that odorant receptors are also involved in protein trafficking and in forming cation channels. Both of these activities involve heterodimer formation between odorant receptors that bind odorants and those that are part of the Or83b subfamily. There is little informaiton on how heterodimers are formed and where within the protein heterodimer sites exist. The C-terminal region has been implicated as sites for such heterodimer formation. A hidden markov model based program, Multiple em for motif elicitation (MEME), was used to uncover three motifs in the C-terminus of the odorant receptor peptides from Anopheles gambiae, D. melanogaster, and Apis mellifera. Previous studies have shown that insect odorant receptors are highly divergent between different insect lineages suggesting conservation of these motifs is functionally important. I propose that these motifs are involved in receptor-receptor protein interactions, contributing to the heterodimer formation between Or83b subfamily members and other odorant receptors.The next goal was to identify odorant receptors in closely related mosquito species and compare and contrast them. This was accomplished by using public sequence data of An. gambiae and BAC library screening to identify orthologous gene clusters in An. stephensi and An. quadriannulatus. Although I have identified many different odorant receptor genes the chapter in this dissertation discusses my work with the Or2 gene cluster. Multi-species comparison of these orthologous regions in An. gambiae, An. quadriannulatus, and An. stephensi revealed highly conserved gene structure among the OR genes and the discovery of the An. stephensi Or10x gene (AsOr10x), which is present only in An. stephensi. AsOr10x showed a different expression pattern than AsOr2 and AsOr10, the other members of this gene subfamily in An. stephensi. Therefore AsOr10x might be adapting or has adapted a new function. Analysis of the phylogeny and physical location of all known members of the Or2/Or10 gene subfamily in Anopheles, Aedes, and Culex mosquitoes suggest that a few events of gene duplication and loss resulted in the current gene distribution. The final focus of this project was to develop a method to study the function of mosquito odorant receptors. There is currently no in vivo system to study mosquito odorant receptors, and experimental systems pioneered in D. melanogaster are not transferable to mosquitoes. I decided to employ a reverse genetics strategy involving the silencing of three Aedes aegypti odorant and gustatory receptors of known or suspected function. These gustatory receptors are members of a small subfamily that encode olfactory and not taste receptors. As a preliminary step the expression profiles of these three genes and an additional gustatory receptor were determined using non-quantitative and quantitative RT-PCR. We found that the putative CO₂-detecting gustatory receptors are expressed in Ae. aegypti larvae, and hence these larvae may respond to CO₂, an observation that has not been reported previously. The purpose of silencing these receptors is to generate a loss-of-function behavior phenotype that will allow for inference of receptor function. Recombinant Sindbis viruses were used to knockdown mRNA levels of these receptors. GFP-expressing recombinant Sindbis viruses were shown to infect chemosensory tissue. Additional viruses containing fragments of receptor genes were found capable of lowering odorant and gustatory receptor mRNA levels. Infected mosquitoes displayed varying levels of gene knockdown with one virus generating supression of mRNA levels to 15.0% of normal. These mRNA levels may not be low enough to generate an unambiguous phenotype. Future experimentation is focused on developing more effective recombinant viruses and identifying characteristics of viruses more effective in receptor gene knockdown. A safe and effective behavior assay setup is needed to test the behavioral responses of these infected mosquitoes. In this study I outline a preliminary behavior assay that is being developed and optimized. When established it will provide a powerful tool in the study of both basic mosquito behavior and phenotype screening of recombinant Sindbis virus-infected mosquitoes. / Ph. D.

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