The main focus of the current study was to quantify the chemical signals received by a blue crab (Callinectes sapidus) tracking a source in a laboratory flume. To make a direct linkage between tracking behavior and the odorant concentration signal, we developed a measurement system to quantify the instantaneous concentration field surrounding actively tracking blue crabs. A three-dimensional laser-induced fluorescence (3DLIF) system was designed and constructed to measure odorant concentrations around crabs tracking three source types: a continuous release with exit velocity matching the mean local velocity in the flume; a continuous release with a meander created by an upstream cylinder; and a pulsed release switching on and off and with the same mass flow rate as the other two plume types. The meandering and pulsed plumes were introduced to observe the effects of large-scale spatial (meandering) and temporal (pulsed) intermittency on crab tracking. Simultaneous with the chemical concentration measurements, crab position data was recorded for kinematic analysis during post-processing. In addition, concentration measurements were collected for the three plume types without crabs present in order to quantify the statistical characteristics of the plume structure The concentration signals arriving at the antennules and outer chemosensory organs, most notably the legs, were targeted due to the hypotheses that concentration bursts at the antennules mediate upstream movement and that spatial contrast at the leg chemosensors mediates turning. A sampling zone was placed in front of the crab's mouth parts and aligned with the crab carapace orientation to extract odorant bursts at the antennules. The data generally showed an increase in upstream walking speed when high concentration bursts arrive at the antennules location, which agrees with the hypothesis. Measurement of the odorant concentration at the outer chemosensors was less direct and involved placing a box upstream of the crab and sampled earlier in time in order to avoid shadowing interference. Based on the signal at the upstream sampling box, a general bias for turning was observed. Crabs casted transversely in response to the directional bias extracted from the upstream sampling box. A statistical analysis of crab behavioral response to concentrations at the antennules and outer chemosensors can be found in a (future) companion thesis written by Jennifer Page in the School of Biology. Data were also taken for the three plume types in the absence of blue crabs. The continuous plume average statistics displayed Gaussian behavior at nozzle centerline. The meandering plume data conformed to the meandering plume model of Gifford (1959), modified for an induced pseudo-periodic meander. The pulsed plume displayed characteristics intermediate between the cloud dispersion model (Townsend 1951, Chatwin and Sullivan 1979) and the Gaussian dispersion model for a continuous release. For the three plume types, the standard deviation of the concentration fluctuations was greater than the average concentrations, as time records consisted of intermittent high concentrations interspersed with concentrations close to zero.

In a honey bee colony, the queen uses queen mandibular pheromone (QMP) to induce young worker bees to feed and groom her. Among its many behavioural and physiological effects, QMP reduces dopamine levels in the brains of young worker bees. Dopamine is a biogenic monoamine involved in numerous functions including motor control and aversive learning. This study investigates the effects of QMP on motor activities and aversive learning behaviour and the potential link between QMP and dopamine levels in the brain of young bees. In young bees under the age of 15-days, QMP dramatically reduced locomotor activity and inhibited aversive learning behaviour. Interestingly in older bees these behaviours were not affected by pheromone. Treating young bees with the dopamine precursor, L-dopa (3.25 [mu]g/mI), partially rescued the levels of locomotor activity in QMP-treated bees, and reduced QMP�s effects on aversive learning. This suggests that blocking effects of QMP on both locomotor activity and aversive learning result at least in part from QMP-induced changes in brain dopamine levels. Two components of the QMP blend, 4-hydroxy-3-methoxyphenylethanol (HVA) and methyl p-hydroxybenzoate (HOB) were examined more closely. Both HVA and HOB are structurally similar to dopamine. HVA was found to mimic the effects of the full QMP blend on aversive learning. Treating bees with HVA reduced aversive learning in young bees. In contrast, treatment with HOB did not affect learning ability. This strongly suggests that HVA is one of the key components that mediates the actions of QMP on aversive learning. The final section of this thesis investigates why it might be advantageous to honey bee queens to block aversive learning and reduce locomotor activity in young worker bees. The study reveals age-related differences in behaviours that individual worker bees display towards QMP. Young bees reared with QMP or collected from a queenright hive showed attraction to QMP. Conversely, older bees displayed avoidance behaviour towards QMP. By blocking the establishment of aversive memories, young bees may be prevented from forming an association between QMP and any unpleasant side effects induced by this pheromone. This may confer significant benefit to the queen by increasing the likelihood of young workers remaining in her attendance.

Diss. (sammanfattning) Alnarp : Sveriges lantbruksuniv. / Härtill 5 uppsatser och 1 bildbil.

Diss. (sammanfattning) Alnarp : Sveriges lantbruksuniversitet, 2004. / Härtill 5 uppsatser.

Thesis (Ph. D.)--University of Hong Kong, 2007. / Title proper from title frame. Also available in printed format.

Thesis (M.S.)--State University of New York at Binghamton, Department of Psychology, 2009. / Includes bibliographical references.

Thesis (Ph. D.)--Georgia Institute of Technology, 2006. / Title from PDF t.p. (viewed on Oct. 28, 2006). Marc Weissburg, Committee Chair ; Mark Hay, Committee Member ; Lin Jiang, Committee Member ; David Dusenbery, Committee Member ; Don Webster, Committee Member. Includes bibliographical references (p. 115-122).

The aim of this thesis is to study the multidimensional relation between the spatial and the social by focusing on Van as a place. In order to understand social processes, it is important to view the complex relation between the spatial and the social. Taking the space-place relation into consideration, this work approaches to the processes of construction and representation of identity of place in the framework of the interrelation between place, culture and identity. Different groups in society are in a constant contestation over the construction of the meaning and the identity of place. This work, studies how place is constituted both materially and imaginarily within this contestation process. Senses of place and the meanings given to places are formed by social, cultural, economical and political situations of the people. Consequently this thesis, discusses the contestation over the representation and the use of place in the context of social, cultural, economical, political processes and power relations. It considers the dynamics which are effective on the constitution of image of Van. It studies the influences of these dynamics on the construction, the use, the transformation and the reproduction of place through the cultural practices of different groups in the city. This thesis, researches the relation between place and culture, the everyday life practices of different groups and the process of production of meaning through these practices.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Esta tese trata da construção de sentidos e significados no estilo natural de alimentação. Parte do princípio que simbolizar é uma forma de organizar a vida, que funde as dimensões do singular e do coletivo, em um corpo socialmente informado. Explora a conceituação e a desnaturalização, nos termos de Luz e de Bourdieu, como estratégias metodológicas, para fundamentar um trabalho de campo com naturistas, veganos e adeptos da alimentação do vivo, todos agrupados na categoria de análise de práticas de alimentação urbana natural. Explora a prática de bricolagem como estratégia de construção simbólica na prática e discute seu efeito ora favorável, ora não, no enfrentamento da crise acirrada pela desigualdade social. Chegamos a três grupos de sentidos na análise interpretativa: o de Natureza re-sacralizada, o de impureza atribuído à carne vermelha e ao de liberdade expresso na reprodução do movimento social urbano denominado contracultura. Todos se apresentam entrelaçados em um sistema de símbolos construídos em um campo específico, segundo regras de um jogo construído também no campo, que confere forças aos agentes, e seguem interesses diversos. Concluímos que uma análise interpretativa contribui na organização das trocas simbólicas, que diferentemente das trocas monetárias, demanda um conhecimento do campo específico e das relações sociais em que são (re)produzidos os sentidos e significados no estilo natural. Consideramos que assim contribuímos para a inserção das ciências sociais no campo da nutrição. / This work focus on the construction of senses and meanings within a natural eating style. It starts from the principle that the very act of symbolizing is a way to organize life that merges both singular and collective dimensions into a socially informed body. It explores the conceptualization and denaturalization, in the terms applied by Luz and Bourdieu, as methodological strategies to substantiate a field work with naturists, vegans and living food followers, all grouped within the analytical category of natural urban eating practices. It also explores bricolage practice as a handson symbolic construction strategy and discusses its effect, at times favorable or not, on the fight against the crisis worsened by social inequality. We have come to three groups of meanings in our interpretative analysis: that of re-sacred Nature, that of impurity assigned to red meat (mainly beef, lamb etc.) and that of freedom expressed in the reproduction of the urban social movement called counterculture. They are all intertwined into a system of symbols built within a specific field, according to the rules of the game also built in the field, which grants strengths to the actors, and follow several interests. We have reached the conclusion that an interpretative analysis contributes to the organization of the symbolic exchanges which, unlike monetary exchanges, demand the knowledge of both the specific field and the social relationships in which senses and meanings are (re)produced in the natural style. Thus, we understand that we are making a contribution to the inclusion of social sciences in the field of nutrition.

A project around loss and absence. This work is a reflection on tradition, mourning and the importance to remember. Based on how crafts relate to society in ceremonial contexts by being a tool to communicate with others. By having a reflective relation with tradition this fiber works intend to transfer the innate poetic language of symbolic materials used in rituals around death and commemoration in Mexico into new forms through specific repetitive actions in the making. Delving into the unique physical qualities of onion skin, sugar, beeswax, corn husks and paper. Seeking to evoke an emotion by diverting our perception of ordinary materials.