{"683130":{"#nid":"683130","#data":{"type":"event","title":"PhD Defense by Jixiang Xu","body":[{"value":"\u003Cp\u003E\u003Cimg 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width=\u0022362\u0022 height=\u002274\u0022\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EIn partial fulfillment of the requirements for the degree of\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EMaster of Science in Biology\u003C\/p\u003E\u003Cp\u003Ein the\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EJixiang Xu\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EWill defend her thesis\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u201cEFFECTS OF SULFOXAFLOR EXPOSURE ON BOMBUS IMPATIENS\u201d\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E21, July, 2025\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E1 PM\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/98569355573?pwd=KqgRMhQffU7Lrvl6Oh2oKhsEbSdw9v.1\u0022\u003Ehttps:\/\/gatech.zoom.us\/j\/98569355573?pwd=KqgRMhQffU7Lrvl6Oh2oKhsEbSdw9v.1\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EThesis Advisor:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDr. Michael Goodisman\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003EDr. Joseph Lachance\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003EDr. Annalise Paaby\u003C\/p\u003E\u003Cp\u003ESchool of Biological Sciences\u003C\/p\u003E\u003Cp\u003EGeorgia Institute of Technology\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EAbstract: This study focuses on the insecticide sulfoxaflor (SFX) that reveals that its significant threat to the common eastern bumblebee, Bombus impatiens, is not neurotoxicity but severe reproductive failure. The research hypothesis that chronic, sublethal SFX exposure would negatively impact worker bees by altering gene expression in brain and ovary tissues. While acute toxicity tests established a lethal dose (LC\u2085\u2080 of 1.2222 mg\/L), the more critical findings came from chronic exposure to field-realistic concentrations (0.16mg\/L and 0.31mg\/L). These experiments documented severe dose-dependent behavioral and reproductive impairments, including significantly reduced nectar consumption, honey pot construction, and a cessation of egg-laying. RNA sequencing revealed a tissue-specific differential gene expression: while the brain\u2019s gene expression remained largely unaffected, the ovary shows a massive, dose-dependent transcriptomic change. This identifies the ovary, not the brain, as the primary site of chronic SFX pathology. Functional analysis showed SFX disrupting genes essential for meiosis, cellular signaling, energy metabolism, and tissue structure.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003E\u201cEFFECTS OF SULFOXAFLOR EXPOSURE ON BOMBUS IMPATIENS\u201d\u003C\/strong\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"\u201cEFFECTS OF SULFOXAFLOR EXPOSURE ON BOMBUS IMPATIENS\u201d"}],"uid":"27707","created_gmt":"2025-07-14 19:49:09","changed_gmt":"2025-07-14 19:49:09","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2025-07-21T13:00:00-04:00","event_time_end":"2025-07-21T15:00:00-04:00","event_time_end_last":"2025-07-21T15:00:00-04:00","gmt_time_start":"2025-07-21 17:00:00","gmt_time_end":"2025-07-21 19:00:00","gmt_time_end_last":"2025-07-21 19:00:00","rrule":null,"timezone":"America\/New_York"},"location":"ZOOM","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}