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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Analysis of lipid during the life cycle of the house cricket, Acheta domesticus (L.).Lipsitz, Edmond Y., 1925- January 1969 (has links)
No description available.
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Analysis of lipid during the life cycle of the house cricket, Acheta domesticus (L.).Lipsitz, Edmond Y., 1925- January 1969 (has links)
No description available.
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The genetic and endocrine bases of the evolution of complete metamorphosis in insects /Erezyilmaz, Deniz F., January 2004 (has links)
Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 82-92).
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Sensorimotor integration and the role of the cercal system in the reproductive behavior of the cricket, Acheta domesticusSnell, Lewis Casbeer. January 2005 (has links)
Thesis (Ph. D.)--Miami University, Dept. of Zoology, 2005. / Title from second page of PDF document. Includes bibliographical references (p. 100-108).
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The maturation of the immune system and the effects of crowding and light stress during development on the immune function of the adult house cricket Acheta domesticusPiñera, Angelica Vivas 21 August 2012 (has links)
No description available.
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Expansionsmöjligheter hos Acheta domesticus : En studie om syrsmjölets påverkan på färg,textur, gillande och expansion i extruderadmajskrok. / Expandability of Acheta domesticus : A study on the effect of cricket flour on color, texture, liking and expansion in extruded corn puffs.Andersson, Fredrik, Hansson, Mattias January 2020 (has links)
I takt med en ökande världspopulation ställs allt hårdare krav på primärproducenter att tillgodose råvaror i adekvata mängder. Forskning inom området är av stor vikt för att hitta nya hållbara källor för näringsämnen som exempelvis protein, eftersom produktionen i dagsläget för med sig många miljömässiga nackdelar. I samband med att EU godkänner insekter som livsmedel får fler upp ögonen för eventuella fördelar som de kan bidra med som råvara. Syftet med denna studien är att undersöka vilken påverkan tillsats av syrsmjöl har på färg, textur, gillande och expansion hos extruderad majskrok. Detta är ett steg i riktningen mot implementering av insekter i västerländsk kost. Genom att analysera vatten och proteinhalt i den extruderade produkten, samt mäta dess färg, textur, radiella expansion och gillande hos konsument kan insamlad data ställas mot varandra och eventuella korrelationer belysas. Resultatet från studien visar att vid högre andel syrsmjöl blir texturen kompaktare, expansionen mindre och en färgförändring sker åt det mörkare hållet. De prov med lägre andel tillsatt syrsmjöl, och därmed en bättre expansion, fick högst gillandepoäng på alla frågeställningar i ett konsumenttest. / In line with a growing world population, higher demands are put on primary producers to supply raw materials in adequate quantities. Research in the area is of great importance in finding new sustainable sources of nutrients such as protein, which presently brings with it many environmental disadvantages. As the EU approves insects as food, more people are becoming aware of potential benefits they can provide. The purpose of this report is to investigate the effect of the addition of cricket flour on the color, texture, liking and expansion of an extruded corn puff. This is a step towards the implementation of insects in the Western diet. By analyzing the water and protein content of the extruded product, as well as measuring its color, texture, radial expansion and consumer appreciation, collected data can be compared and any correlations can be shown. The results of the study show that with a higher proportion of cricket flour the texture becomes more compact, shows less expansion and a color change toward a darker tone. The samples with a lower proportion of added cricket flour, and thus a better expansion, received the highest points of liking on all the questions in the consumer test.
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Purification and Characterization of Acheta domesticus and Gryllodes sigillatus Cricket Chitin and Chitosan for Bioactive and Biodegradable Food Packaging ApplicationsMorgan J Malm (11763944) 03 December 2021 (has links)
<p>The production of insects for protein is projected to reach a market share of 1.33 billion USD, a rapid increase from the estimated 144 million USD share of 2019 market. The isolation of insect protein produces by-products, including chitin. Currently chitin is extracted from aquaculture by-products, such as shrimp and crab shells, and used to produce chitosan for various applications in the supplement and food industry. With the insect market expected to continue its growth, the feasibility of sourcing commercial chitin and chitosan from reared crickets’, and the application properties of its counterpart, chitosan, was investigated in this dissertation. In the first part of this dissertation, chitin from two commonly reared crickets in the Unites States, <i>Acheta domesticus</i> and <i>Gryllodes sigillatus</i>, was successfully extracted, purified, and identified as a commercially viable option for chitin and chitosan. Extensive crustacean chitin studies served as the foundation of purification steps, however durations were adjusted to account for intrinsic differences between insects and crustacean exoskeletons. Furthermore, cricket chitosan was prepared and optimized with varying degrees of deacetylation. As expected, cricket chitosan had lower molecular but did not have a detectable effect on the bioactive properties tested. All cricket chitosan produced had similar lipid binding capacity <i>in vitro</i>. Additionally, the microbial inhibition of cricket chitosan and commercial chitosan (~70% DDA) were not significantly different when evaluated against <i>L. innocua</i> and <i>E. coli</i>. High DDA cricket chitosan showed greatest bacterial inhibition as expected. In the second part of this dissertation, cricket derived chitosan showed similar and improved food packaging properties, when evaluated against commercial shrimp chitosan. microstructure analysis provided by scanning electron microscopy showed greater compaction and agglomeration of cricket chitosan films. The change in microstructure may be attributed to the increased complexity generally attributed to insect chitosan materials, a result of remaining melanin and protein in close association with insect exoskeleton chitosan. As a result, cricket films had similar or increased tensile strengths but decreased elongation percentages when compared to shrimp films. Water vapor permeability of cricket films was decreased due to tortuosity. Residual melanin likely played an important role in increasing cricket film surface hydrophobicity and providing enhanced light barrier properties. Overall, this dissertation successfully shows the potential of crickets as insect derived chitin and chitosan, and its effectiveness as a lipid binding and antibacterial agent, as well as its potential use in biobased food packaging. </p>
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Off-Host Biology and Ecology of Immature Gulf Coast Ticks (Amblyomma Maculatum Koch) in MississippiPortugal, Jose Santos 06 May 2017 (has links)
Little is understood about off-host behavior and ecology of immature Amblyomma maculatum Koch (Gulf Coast tick). A more complete understanding of this tick is essential to protect human and animal health. My research focused on seasonality and distribution of immatures in Mississippi, potential suitability of some insect and human hosts to larvae, and aspects of nymphal questing behavior. A single larva was collected (third off-host collection reported) when sampling A. maculatum habitat using a novel device. Collection of this larva in November expands the stage’s known seasonality and confirmed a prediction concerning seasonality of larval A. maculatum. Low frequency of immatures (8.3%) confirmed that they’re incredibly difficult to collect off-host. Nymphal collections peaked in March, and known seasonality was extended for both nymphs and adults. I examined known records, elucidating seasonality and distribution of A. maculatum in Mississippi. Either multiple generations per year or diapause are responsible for observed bi-modal distribution of immature collections. Additionally, I compiled the most extensive host record of immature A. maculatum in Mississippi and investigated seasonality patterns using USDA plant hardiness zones. I compiled the most complete record of ticks found on arthropods. Amblyomma americanum and A. maculatum were both confirmed to crawl onto arthropods, giving support to occasional, unintentional dispersal by phoresy. There was no conclusive evidence that larval A. maculatum feed on arthropods, however data supported feeding by larval A. americanum. These results have interesting implications regarding evolution of pathogens/endosymbionts. I provided the first evidence that larval A. maculatum can attach to humans. Rickettsia parkeri, a human pathogen transmitted by this species has recently been shown to be capable of transovarial transmission. Therefore, larval A. maculatum may provide another avenue of transmission. I have demonstrated that A. maculatum are difficult to collect off-host in part because they prefer to quest low to the ground. In choice studies, 5-cm-tall stems were most likely to be occupied by nymphs released into an array of stems. Low vapor pressure deficit encouraged questing, while higher VPD and warmer temperature increased questing height. These results may have implications in understanding host-seeking behavior in other tick species as well.
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