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Germination and Inhibitory Activity of Spore-Forming Microbes on Surface Materials Used in Healthcare Settings
Germination and Inhibitory Activity of Spore-Forming Microbes on Surface Materials Used in Healthcare Settings
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152727
- ISBN
- 9798384472858
- DDC
- 576
- 저자명
- Gottel, Neil.
- 서명/저자
- Germination and Inhibitory Activity of Spore-Forming Microbes on Surface Materials Used in Healthcare Settings
- 발행사항
- [Sl] : University of California, San Diego, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 117 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Gilbert, Jack.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Diego, 2024.
- 초록/해제
- 요약Surfaces in healthcare settings are colonized by pathogens, where they persist and are transmitted to other locations. Cleaning solutions that contain bacterial spores are an alternative to current methods for cleaning healthcare surfaces. My dissertation investigates how effectively these spores germinate on surfaces used in healthcare settings, whether they inhibit the survival of methicillin-resistant Staphylococcus aureus (MRSA), and if incorporated into a 3D printed structure, how effectively they germinate and inhibit MRSA. The first chapter investigates the germination efficiency of bacterial spores on surfaces from healthcare settings. Droplets of media containing a mixture of 5 Bacillus spp. and Priestia spp. were placed on laminate or vinyl, at either ambient or elevated relative humidity, then collected over a three-day timeseries via swabbing, followed by heat shocking and plating to determine the ratio of germinated spores to the total number of spores and cells. I found that there was a low, baseline level of germination, and that only very nutrient rich media would achieve high germination rates. The type of surface and the humidity also had a significant influence, but only at later timepoints in the experiments. The second chapter focuses on the inhibition of MRSA using the spore mix from chapter 1. Droplets containing MRSA by itself or in co-culture with the spore mix were placed on laminate or vinyl and incubated at over a three-day timeseries. CFU enumeration was used to determine whether the survival of MRSA was influenced by the spore mix. Surface, humidity, and competition medium significantly influenced the survival of MRSA, but the presence of the spore mix did not inhibit MRSA survival. The third chapter uses 3D printed structures that contain a strain of B. subtilis shown to have potent anti-MRSA inhibitory activity. Using optical density readings and CFU enumeration, the germination and growth of B. subtilis out of the structure and its inhibition of MRSA was investigated. Approximately 20% of the spores in the structures germinate and move out of the structure in liquid culture to inhibit MRSA, but the structures do not completely eliminate MRSA in either liquid culture or on solid agar surfaces.
- 일반주제명
- Microbiology
- 일반주제명
- Pathology
- 일반주제명
- Environmental science
- 키워드
- Bacillus
- 키워드
- Germination
- 키워드
- Spores
- 기타저자
- University of California, San Diego Scripps Institution of Oceanography
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798384472858
■035 ▼a(MiAaPQ)AAI31490368
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a576
■1001 ▼aGottel, Neil.
■24510▼aGermination and Inhibitory Activity of Spore-Forming Microbes on Surface Materials Used in Healthcare Settings
■260 ▼a[Sl]▼bUniversity of California, San Diego▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a117 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Gilbert, Jack.
■5021 ▼aThesis (Ph.D.)--University of California, San Diego, 2024.
■520 ▼aSurfaces in healthcare settings are colonized by pathogens, where they persist and are transmitted to other locations. Cleaning solutions that contain bacterial spores are an alternative to current methods for cleaning healthcare surfaces. My dissertation investigates how effectively these spores germinate on surfaces used in healthcare settings, whether they inhibit the survival of methicillin-resistant Staphylococcus aureus (MRSA), and if incorporated into a 3D printed structure, how effectively they germinate and inhibit MRSA. The first chapter investigates the germination efficiency of bacterial spores on surfaces from healthcare settings. Droplets of media containing a mixture of 5 Bacillus spp. and Priestia spp. were placed on laminate or vinyl, at either ambient or elevated relative humidity, then collected over a three-day timeseries via swabbing, followed by heat shocking and plating to determine the ratio of germinated spores to the total number of spores and cells. I found that there was a low, baseline level of germination, and that only very nutrient rich media would achieve high germination rates. The type of surface and the humidity also had a significant influence, but only at later timepoints in the experiments. The second chapter focuses on the inhibition of MRSA using the spore mix from chapter 1. Droplets containing MRSA by itself or in co-culture with the spore mix were placed on laminate or vinyl and incubated at over a three-day timeseries. CFU enumeration was used to determine whether the survival of MRSA was influenced by the spore mix. Surface, humidity, and competition medium significantly influenced the survival of MRSA, but the presence of the spore mix did not inhibit MRSA survival. The third chapter uses 3D printed structures that contain a strain of B. subtilis shown to have potent anti-MRSA inhibitory activity. Using optical density readings and CFU enumeration, the germination and growth of B. subtilis out of the structure and its inhibition of MRSA was investigated. Approximately 20% of the spores in the structures germinate and move out of the structure in liquid culture to inhibit MRSA, but the structures do not completely eliminate MRSA in either liquid culture or on solid agar surfaces.
■590 ▼aSchool code: 0033.
■650 4▼aMicrobiology
■650 4▼aPathology
■650 4▼aEnvironmental science
■653 ▼aAntimicrobial resistant
■653 ▼aBacillus
■653 ▼aBuilt environment
■653 ▼aGermination
■653 ▼aSpores
■690 ▼a0410
■690 ▼a0768
■690 ▼a0571
■71020▼aUniversity of California, San Diego▼bScripps Institution of Oceanography.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0033
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163584▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


