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(1 - 8 of 8)
- Title
- Rebuilt and Remade: The Florida Citrus Industry, 1909-1939.
- Creator
-
Padgett, James, Lester, Connie, Pineda, Yovanna, French, Scot, University of Central Florida
- Abstract / Description
-
Prior to orange juice concentrate, Florida citrus was already an industrialized agricultural sector. This thesis explores the early-20th-century Florida citrus industry and demonstrates that contemporary farming practices were influential in advancing how citrus was produced, processed, worked, marketed, and regulated in early-20th-century Florida. Restarted after devastating freezes in 1894-1895, resolute Florida growers rebuilt their groves into marvels of large-scale citrus fruit...
Show morePrior to orange juice concentrate, Florida citrus was already an industrialized agricultural sector. This thesis explores the early-20th-century Florida citrus industry and demonstrates that contemporary farming practices were influential in advancing how citrus was produced, processed, worked, marketed, and regulated in early-20th-century Florida. Restarted after devastating freezes in 1894-1895, resolute Florida growers rebuilt their groves into marvels of large-scale citrus fruit production. Continuing a legacy in experimental crossbreeding, improved varieties of citrus were developed to lengthen the season and markets. Advocated by nurserymen and university educators, biological innovation helped the citrus thrive in the 1910s and 1920s from adverse weather effects, pests, and diseases. Scientists were agents of modernization whose research influenced its industrialization. With the inclusion of machines in the processing of citrus, technological innovation materialized significantly in Florida's packinghouses by the 1930s. These changes affected the lives of agricultural workers and small growers. Whether by prejudice or by resisting collective efforts, big growers gained power and influence in the industry, Their power concentrated into the Florida Citrus Codes and Florida Citrus Commission in 1935, which effectively allowed large-scale growers to direct the industry's development into the rest of the 20th century. In all, this reexamination into Florida citrus exemplifies the remaking of this industry into a modern agricultural system as well as the gradualism of southern agricultural modernization in early-20th-century America.
Show less - Date Issued
- 2018
- Identifier
- CFE0007906, ucf:52745
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007906
- Title
- Fluorescence Lifetime Imaging and Spectroscopy Aided Tracking of ZnO and CdS:Mn/ZnS/ N-acetyl cysteine (NAC) Quantum Dots in Citrus Plants.
- Creator
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Washington, Torus, Gesquiere, Andre, Rajaraman, Swaminathan, Zhai, Lei, University of Central Florida
- Abstract / Description
-
In this thesis, we present an efficacious way of tracking nanoparticle movement in plant tissue through the use of fluorescence lifetime imaging (FLIM) and spectroscopy as well as a review of nanoparticle uptake in plants and the proposed mechanisms governing them. Given the increasing number of nanomaterials in agriculture and society as a whole, proper imaging tools and proactive measures must be taken to track nanoparticle movement in plant tissues and create infrastructure and products to...
Show moreIn this thesis, we present an efficacious way of tracking nanoparticle movement in plant tissue through the use of fluorescence lifetime imaging (FLIM) and spectroscopy as well as a review of nanoparticle uptake in plants and the proposed mechanisms governing them. Given the increasing number of nanomaterials in agriculture and society as a whole, proper imaging tools and proactive measures must be taken to track nanoparticle movement in plant tissues and create infrastructure and products to keep things sustainable and safe. Herein we report a ZnO comparable nanoparticle(-) a CdS:Mn/ZnS/ N-acetyl cysteine (NAC) quantum dot(-) which boasts longer lifetimes and suitable fluorescent properties above ZnO to properly delineate from plant tissue fluorescence of chlorophyll and cinnamic acids. In addition to FLIM mapping, quantum dot localization in plant vascular tissue was clearly seen and confirmed via characteristic emission spectra and time correlated single photon counting decay curves (TCSPC). Most quantum dots were seen to reside in the xylem. Plant age and structure was seen to affect uptake. QD size likely restricted extensive translocation. Inhibitive effects of QDs were likely water and mechanical stress. We surmise that travel of the cadmium quantum dots up the leaf and branch plant tissues is likely most governed by diffusion as the quantum dots bound to the cell structures create a diffusion gradient which aids travel up the leaf.
Show less - Date Issued
- 2017
- Identifier
- CFE0006820, ucf:51772
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006820
- Title
- Electrochemical Microsensors for In Situ Monitoring of Chemical Compounds in Engineered and Natural Aquatic Systems.
- Creator
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Church, Jared, Lee, Woo Hyoung, Randall, Andrew, Duranceau, Steven, University of Central Florida
- Abstract / Description
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The adaption of needle-type electrochemical microsensor (or microelectrode) techniques to environmental science and engineering systems has transformed how we understand mass transport in biotic and abiotic processes. Their small tip diameter (5-20(&)#181;m) makes them a unique experimental tool for direct measurements of analytes with high spatial and temporal resolutions, providing a quantitative analysis of flux, diffusion, and reaction rate at a microscale that cannot be obtained using...
Show moreThe adaption of needle-type electrochemical microsensor (or microelectrode) techniques to environmental science and engineering systems has transformed how we understand mass transport in biotic and abiotic processes. Their small tip diameter (5-20(&)#181;m) makes them a unique experimental tool for direct measurements of analytes with high spatial and temporal resolutions, providing a quantitative analysis of flux, diffusion, and reaction rate at a microscale that cannot be obtained using conventional analytical tools. However, their applications have been primarily limited to understanding mass transport dynamics and kinetics in biofilms. With the advancement of sensor fabrication and utilization techniques, their potential applications can surpass conventional biofilm processes. In this dissertation, microsensors were utilized to elucidate mass transport and chemical reactions in multidisciplinary research areas including biological nutrient uptake, oily wastewater treatment, photocatalytic disinfection, and plant disease management, which have not yet explored using this emerging technology. The main objective of this work was to develop novel microsensors and use them for better understanding various natural and engineered aquatic systems. These include; 1) investigating localized photo-aeration and algal-bacterial symbiotic interaction in an advanced algal-bacterial biofilm process for nutrient removal from wastewater, 2) characterizing oil-in-water emulsions for better understanding bilge water emulsion stability, 3) evaluating sun-light driven photocatalytic reactions using a novel MoS2 nanofilm for water disinfection and microcystins-LR removal, 4) developing a zinc ion-selective microsensor and applying them for monitoring the transport of zinc in citrus trees, and 5) integrating heavy metal detection using anodic stripping voltammetry (ASV) in a microelectrode platform for plant applications.
Show less - Date Issued
- 2018
- Identifier
- CFE0007565, ucf:52576
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007565
- Title
- THE EFFECT OF CLIMATE ON PHYSIOLOGY AND IMMUNE FUNCTION IN THE ASIAN CITRUS PSYLLID, DIAPHORINA CITRI.
- Creator
-
Avecilla, Grace, Fedorka, Ken, University of Central Florida
- Abstract / Description
-
The variation in the insect immune system is an important regulator of insect populations and the pathogens they carry. A central component of insect immunity is melanin, whose production creates cytotoxic intermediates that help to protect against a broad spectrum of pathogens. Melanin is also used in insect cuticle where it helps to improve thermoregulation and desiccation resistance, with insects having less melanized cuticles in warmer and more humid environments. Considering that cuticle...
Show moreThe variation in the insect immune system is an important regulator of insect populations and the pathogens they carry. A central component of insect immunity is melanin, whose production creates cytotoxic intermediates that help to protect against a broad spectrum of pathogens. Melanin is also used in insect cuticle where it helps to improve thermoregulation and desiccation resistance, with insects having less melanized cuticles in warmer and more humid environments. Considering that cuticle melanin and immune melanin are formed by near identical biochemical pathways, they are pleiotropically linked (that is, one or more linked genes influence multiple traits). This has lead to the cuticle-dependent immune investment (CDII) hypothesis, which states that adaptive responses in the cuticle can lead to non-adaptive changes in immunity and could lead to an increase in transmission of insect vectored pathogens in warming climates, due to a weaker defense against the pathogen. However, the impact of CDII on cuticle melanin and immunity, as well as infection prevalence and intensity, under seasonal conditions in the field is still unclear. In this project, we study a population of Asian citrus psyllids, Diaphorina citri, in the field over four seasons. Diaphorina citri vectors a Gram-negative bacteria, Candidatus Liberbacter asiaticus (CLas), that is responsible for Huanglongbing, aka citrus greening disease, which has cost the Florida citrus industry several billion dollars. We assess pathogen load of CLas by quantitative PCR, and assess levels of phenoloxidase activity in the insect hemolymph to measure insect immune function. We assess levels of cuticle melanin. Our results show a significant correlation between temperature, cuticle melanin, and immune function. However, the affect of seasonality on infection prevalence and intensity remains unclear.
Show less - Date Issued
- 2016
- Identifier
- CFH2000080, ucf:45529
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH2000080
- Title
- Development and Characterization of Solid-Contact Paper-Based and Micro Ion-Selective Electrodes for Environmental Analysis.
- Creator
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Armas, Stephanie, Chumbimuni Torres, Karin, Beazley, Melanie, Santra, Swadeshmukul, University of Central Florida
- Abstract / Description
-
Ion-selective electrodes (ISEs) have extensively been used for food analysis, as medical diagnostic tools, and for some environmental applications. However, ISEs are hindered by the need of a bulky reference electrode and the pre-conditioning step of the sensor, which can often be lengthy. This work will discuss how the direct addition of target analyte into the cocktail sensing membrane can circumvent the pre-conditioning step. Furthermore, the work is presented in an optimized ready-to-use...
Show moreIon-selective electrodes (ISEs) have extensively been used for food analysis, as medical diagnostic tools, and for some environmental applications. However, ISEs are hindered by the need of a bulky reference electrode and the pre-conditioning step of the sensor, which can often be lengthy. This work will discuss how the direct addition of target analyte into the cocktail sensing membrane can circumvent the pre-conditioning step. Furthermore, the work is presented in an optimized ready-to-use single strip design, where the bulky glass reference electrode (RE) is no longer needed. The bulky RE was replaced by drop casting a simple two-component mixture consisting of the co-polymer methyl methacrylate-co-decyl methacrylate and the ionic liquid 1-Ethyl-3-methylimidazolium bis (trifluoromethane sulfonyl) amide. Furthermore, this work will also highlight the benefits of solid-contact ISEs, specifically focusing on two solid- contact platforms: 1) paper-based and 2) a micro-electrode platform. Paper-based based sensors were designed to be used as a possible diagnostic tool to be implemented in undeveloped countries to monitor low levels of potassium and iodide, as model ions. The micro((&)#181;) ISEs were applied for the in-situ analysis of zinc in citrus plants as a mean to monitor and assess disease progression or therapy.
Show less - Date Issued
- 2018
- Identifier
- CFE0007152, ucf:52316
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007152
- Title
- The citrus industry and occupations in Florida.
- Creator
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United States, Mead, Arthur Raymond, PALMM (Project)
- Abstract / Description
-
"Prepared to provide occupational information for youth in high schools, to a lesser degree in colleges and universities, and to out-of-school unemployed." -- Introduction. Gives descriptions of the specific jobs that are performed in the citrus industry, at all stages, from growing to packing or canning the fruit, and at various levels, from laborer to management. Includes statistics on production, trade, and characteristics of citrus industry workers, as well as a discussion of the citrus...
Show more"Prepared to provide occupational information for youth in high schools, to a lesser degree in colleges and universities, and to out-of-school unemployed." -- Introduction. Gives descriptions of the specific jobs that are performed in the citrus industry, at all stages, from growing to packing or canning the fruit, and at various levels, from laborer to management. Includes statistics on production, trade, and characteristics of citrus industry workers, as well as a discussion of the citrus market and excerpts from various documents relating to the industry. Original Date Field: 1938?
Show less - Date Issued
- 1938
- Identifier
- AAA7987QF00010/16/200310/25/200424578BfamIa D0QF, ONICF166- 13, FHP C CF 2003-10-16, FCLA url 20040930xOCLC, 56815654, CF00001661, 2574528, ucf:24113
- Format
- E-book
- PURL
- http://purl.flvc.org/fcla/tc/fhp/CF00001661.jpg
- Title
- MAMMY.
- Date Created
- 1930s
- Identifier
- DP0015356
- Format
- Image (JPEG)
- PURL
- http://purl.flvc.org/ucf/fd/DP0015356
- Title
- Aunty.
- Date Created
- 1940s
- Identifier
- DP0015368
- Format
- Image (JPEG)
- PURL
- http://purl.flvc.org/ucf/fd/DP0015368
