Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Chemical communication"”.
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Chemical communication in the European otter, Lutra lutra
… An ageing study (using SPME) mapped spraint chemical composition changes following deposition and how low temperature storage and exposure to the environment affected these changes. Chemicals with opposite time dependence were found; providing a possible spraint ageing mechanism. Temperature …
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Host plant relationships and chemical communication in the cerambycidae
The beetle family Cerambycidae is one of the largest groups of insects. Commonly referred to as longhorned beetles, the larvae of cerambycids usually feed on the tissues of woody plants and can be important insect pests, damaging and even killing trees in managed and natural landscapes. In this …
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Chemical communication and its ecological consequence in the Lysmata shrimp
Male crustaceans must find and identify receptive females to mate successfully. Mate recognition depends mainly on sex pheromones, which are detected by antennae and antennules. Distance (soluble)pheromone mediates mating behaviour of some decapod crustaceans. Contact pheromone (an insoluble …
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Microfluidic cell culture chambers with nanoporous walls for chemical communication
… is to physically isolate bacteria while allowing chemical communication through metabolite diffusion. In this work, the device enables both high-throughput screening and real-time observation of bacterial growth. In our method, we use a porous material, poly(2-hydroxyethyl methacrylateco-ethylene …
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Chemical communication in cerambycid beetles and the molecular basis of olfaction
… in the subfamily Cerambycinae that may act to chemically separate cerambycid species. I also present a comprehensive survey of volatile chemicals produced by Megacyllene caryae Gahan, the painted hickory borer, a common cerambycid of eastern North American that mimics vespid wasps. Male M. …
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Exploring chemical communication and chemical heterogeneity in biological systems with mass spectrometry imaging
Chemical heterogeneity is present in all biological systems—whether caused by lipid regulation and expression between individual mammalian single cells or by dynamic chemical communication in bacterial communities. Mass spectrometry imaging (MSI) is an untargeted and unlabeled analytical tool that …
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Chemical communication in a declining North American anuran amphibian, the northern leopard frog (lithobates pipiens)
Chemical signaling is known to be an important communication mechanism for amphibians. However, very few studies have directly investigated chemical signaling in anuran groups (frogs and toads), particularly adult anurans. Previous work has focused primarily on salamander and larval anuran …
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Impacts of ocean acidification on fitness and chemical communication in a model marine invertebrate, Nereis succinea
… also caused interference with the reception of chemical cues in this species. Recognition of 3 feeding stimulants (glycine, taurine and fish food extract) was reduced in adult N.succinea cultured in pH 7.8 seawater for 32 days (in comparison with pH 8.2 cultured control worms). The typical …
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Differentiation in reproductive potential and chemical communication of reproductive status in workers and queens of the ant Myrmecia gulosa
… worker specific CHC profiles suggest that these chemicals constitute a queen pheromone. Importance of HC versus non-HC compounds was confirmed by bioassaying purified fraction of both classes of chemicals. This study demonstrates for the first time that purified HCs indeed are at the basis of the …
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The utilization of chemical communication by three species of ghost shrimp, Callichirus islagrande, Callichirus major, and Lepidophthalmus louisianensis, and the transport of chemical cues within and between burrows
… of the factors affecting the potential use of chemical cues by three species of infaunal shrimp was performed in three parts. A set of modified y-maze choice experiments were performed to establish the ability of three species of ghost shrimp, Callichirus islangrande, Callichirus major, and …
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Genetic and metabolomic analysis of how population density modulates neuroendocrine physiology of C. elegans
… of the organism. These cues may be based on chemical communication, secreted from other organisms, both the same and different species, present in the same area. Chapter One of this thesis discusses chemical communication, specifically in Caenorhabditis elegans, throughout development, …
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Chemical Processes That Govern the Natural Attenuation of Microbial Signals: Environments That Simulate Photosynthetic Biofilms
<p>Microbial quorum sensing is a form of chemical communication that is dependent on transmission of molecular signals through the environment. Complex molecular structures, including molecules used in microbial communication, are degraded in the environment through a manifold of reactions …
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Genetically based social communication in an inbred group-living wild mammal
Chemical communication is the oldest and most widespread form of communication in the animal kingdom and its applications are manifold. Assessing relatedness and genetic quality in conspecifics through odor is one such purpose and it can increase an individual’s fitness. However, the mechanisms of …
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The behavioural function of pheromones in crayfish
… efficiency for population control, however the chemical identity of crayfish pheromones is unknown. An incomplete understanding of chemical communication has delayed progress in the development of appropriate bioassays. This thesis therefore focused on researching the natural context of chemical …
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La comunicazione chimica in Blattaria: contributo al miglioramento della lotta
CHEMICAL COMMUNICATION IN BLATTARIA: CONTRIBUTION TO THE IMPROVEMENT OF THE CONTROL TECNIQUES The management of cockroach infestations in urban environment has undergone some changes in recent years by moving to the predominant use of baits, thanks to the awareness of the risks connected with the …
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Patterns of Chemosensory Behavior in a Closed Population of Wild African Elephants (Loxodonta Africana)
… are used by many mammalian species to assess chemical signals in the environment. These chemical signals may contain important information about reproductive state, identity, status, or location of conspecifics. Elephants are a long-lived species and males reproduce at a much later age than …
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The social organisation and behaviour of the striped field-mouse Rhabdomys Pumilio (Sparrman 1784) : studies in captivity and in the field
… and to be dependent, to a certain extent, on chemical communication. In Part II, an attempt was made to confirm these findings in the field. Home ranges on the Cape Flats were determined by tracking; testosterone was used as an index of. social statua. Similarly structured hierarchies were …
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The Neural Circuit for Behavioral Responses to Pheromone and Social Behavior in Caenorhabditis Elegans
… across species from microorganisms to humans. Chemical communication using pheromones is particularly interesting for its versatile use in many organisms, and has been studied at both molecular and circuit levels. However, the central issue of how genes and molecular components contribute to …
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Behavioral and molecular mechanisms of pheromone transmission in the honey bee (Apis mellifera)
… and (E)-beta-ocimene. By integrating behavior, chemical ecology, and transcriptomics, this dissertation analyzes several key stages in signal transmission in a systematic effort to understand how these two pheromones affect behavior, and in the process, generates a synthetic understanding of a …
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Sexually Dimorphic Developmental Patterns of Chemosensory Behaviors in African Elephants (Loxodonta Africana)
… mates who may advertise their condition through chemical and other signals. The difference in adult lifestyles suggests that the developmental pattern of communication for the two sexes should diverge when the social environment and reproductive opportunities of males and females begin to differ. …
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