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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...
Germination and Inhibitory Activity of Spore-Forming Microbes on Surface Materials Used in Healthcare Settings

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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  
Antimicrobial resistant
키워드  
Bacillus
키워드  
Built environment
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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■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.

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