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Showing 1 to 20 of 211 for “"Pheromone"”.
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Random Walks with Pheromone
… wherein questions of dynamics are effected by pheromone trails. In Chapter 2, we discuss when the graph is the n-cycle, and the set of non-zero function values (the trail) is generated by visits of a simple random walk. We show that an optimal trail length is, in some sense, approximately one …
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Mounting Sex Pheromone: A Novel Pheromone Responsible for Mate Recognition in the Ixodidae
… was demonstrated to be the cuticular contact sex pheromone of <em>Dermacentor variabilis</em>. This pheromone which has been termed the Mounting Sex Pheromone (MSP) was also demonstrated to be present on the surface of <em>D</em>. <em>andersoni</em>, <em>Amblyomma maculatum</em> and <em>A. …
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Maternal pheromone in the rat
… an initial failure to replicate the maternal pheromone effect in the rat. It examined:1. Apparatus parameters (airflow rate)2. Pup factors (age, pre-test maternal deprivation, early experience)3. Maternal factors (diet, strains; PVG/C, Wistar, Sprague-Dawley)Publications on the maternal …
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Making Scents of Butterfly Pheromone Evolution
… are used in foraging, defence, and mating, and pheromones are particularly important to the lives of insects. These are chemical signals that mediate the behaviour of conspecifics. Chemical profiles therefore vary according to the ecological roles of their constituent compounds, as well as their …
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Toward developing pheromone emitting trap crops: Metabolic engineering of an aggregation pheromone for enhanced attraction of Phyllotreta cruciferae
Pheromone lures and trap crops are appealing pest management tools that use insect and/or plant volatiles to reduce pest populations on crops of interest. Generating pheromone-emitting trap plants may allow for a continuing and highly-specific attraction of insect pests without repeated and costly …
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Characterization of a competence pheromone in Bacillus subtilis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1995.
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The influence of pheromone dispenser release rates, trap height and pheromone dispenser height on captures of leafrollers in Virginia apple orchards
… rates and longevities of several designs of pheromone dispensers for mating disruption of leafrollers and codling moth, Cydia pomonella (Linneaus). Release rates were described by linear equations for at least four months, but by the end of the season release rates tended to become erratic. …
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Study of evolution of insect pheromone biosynthetic fatty acyl desaturases
Hmyz čitající více než jeden milion popsaných druhů představuje skupinu organismů s ekologickým a ekonomickým významem disproporčně větším než je jejich často zanedbatelná tělesná velikost. Mezi faktory, které zásadní měrou přispěly k evoluční úspěšnosti hmyzu, je počítána schopnost produkovat řadu …
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Pheromone chemistry and reproductive isolation in the subfamily Lamiinae (Coleoptera: Cerambycidae)
… of cerambycid beetles has revealed that the pheromone chemistry of related species is often highly conserved. Sympatric species often share pheromone components, even having identical attractant pheromones. For example, many cerambycines native to different continents use pheromones composed …
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Aggregation Pheromone Biosynthesis and Engineering in Plants for Stinkbug Pest Management
… known to synthesize terpenoids as aggregation pheromones. Knowledge of the genes and enzymes involved in pheromone biosynthesis may allow engineering of pheromone biosynthetic pathways in plants to develop new forms of trap crops and agricultural practices for pest management. The harlequin …
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Pheromone communication and host-finding behaviour of Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae)
… pest of stored grain. Males produce a pheromone, with two components Dominicalure-1 (D 1) and Dominicalure-2 (D2), which is attractive to both sexes. However, little is known about the pheromone biology of R. dominica. This thesis presents new studies that used behavioural bioassay and …
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Insect pheromones : the sex pheromone of Nudaurelia cytherea cytherea Fabr. : (Lepidoptera : Saturniidae)
… identification and synthesis of the sex pheromone from the female pine tree emperor moth Nudaurelia cytherea cytherea Fabr. (Lepidoptera : Saturniidae) are described.
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Regulation of [alpha]-specific gene expression by mating pheromone in S. cerevisiae
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1991.
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A Nonribosomal Peptide Pheromone Controls Male-Induced Female Sexual Development in Schistosoma mansoni
… a nonribosomal peptide synthetase (SmNRPS) and a pheromone metabolite β-alanyl-tryptamine (BATT) were discovered to firstly demonstrate the way a male parasite might signal his paired female. Using RNA sequencing, biochemistry assays and metabolomic analysis, we believe a male parasite starts to …
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Behavioral and molecular mechanisms of pheromone transmission in the honey bee (Apis mellifera)
… care. In honey bees, there are two distinct pheromones emitted by larvae, brood pheromone 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 …
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Identification and Functional Characterization of Sesquiterpene Pheromone Biosynthetic Genes in Stink Bugs (Pentatomidae)
… States and globally. The aggregation or sex pheromones produced by these insects are known to be bisabolene-type sesquiterpenoids; however, the biosynthetic pathways in the formation of these pheromones are unknown. Here we provide evidence that Pentatomidae produce sesquiterpene aggregation …
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Using Digital Pheromone to Improve the Hitting Time Performance of Mobile Agent-Based Systems
… interactions among ants of an ant colony using pheromone. However, the movement patterns of digital ants and the deposition rate of digital pheromone within this framework have a profound effect on the effectiveness of the system. In this thesis, specific digital ant movement patterns and …
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