東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Pathogens, Precipitation, Poop and P...

Weller, Daniel L.

Linked to FindBook

Google Book

Amazon

博客來

Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments./
Author:	Weller, Daniel L.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	188 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Contained By:	Dissertation Abstracts International79-10B(E).
Subject:	Microbiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10744109
ISBN:	9780438025622

Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments.
Weller, Daniel L.

Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 188 p.

Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.

Thesis (Ph.D.)--Cornell University, 2018.

The complexity of the global food supply chain, and the demands of a growing population for safe, sustainable food requires novel, holistic, and adaptive approaches to produce safety. However, food is not produced in a vacuum; farms are closely linked to surrounding environments, which can function as pathogen reservoirs as well as pathways for pathogen dispersal into fields. Thus, a comprehensive understanding of the ecological processes that drive the presence, dispersal and persistence of bacterial pathogens in agricultural environments is essential for the development of adaptive approaches to fresh produce safety. In the studies presented here, we employed several approaches to investigate the ecological processes associated with pathogen dispersal in and contamination of produce production environments at multiple scales. Specifically, these studies investigated (i) spatial and temporal risk factors associated with L. monocytogenes isolation at the farm, field and sub-field levels, and (ii) factors associated with the transfer of generic E. coli from contaminated wildlife feces to and survival on individual, preharvest produce items. We observed that foodborne pathogens are not uniformly present in agricultural environments, and that specific spatial (e.g., proximity to pasture) and temporal (e.g., time between a rain event and harvest) factors were associated with an increased likelihood of pathogen detection. Using this information, we validated geospatial models that predict when and where pathogen contamination of produce production environments is likely to occur. We were also able to identify specific management practices that were associated with pathogen contamination of preharvest produce. For example, irrigation water was found to be a key pathway for pathogen dispersal in agricultural environments. The transfer of bacteria from in-field contamination sources, such as wildlife feces, to preharvest produce during irrigation was significantly associated with the distance between the produce and the feces. Following contamination, bacteria were able to survive on in-field produce for > 10 days. Die-off observed over these 10 days followed a biphasic pattern with more rapid die-off immediately following contamination (i.e., 0--106 hours post-contamination). Overall the findings of the studies reported here provide key data that can be used to develop targeted strategies for reducing the likelihood of preharvest produce contamination.

ISBN: 9780438025622Subjects--Topical Terms:

536250
Microbiology.

Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments.
LDR:03509nmm a2200313 4500 001 2203718
005 20190606091702.5
008 201008s2018 ||||||||||||||||| ||eng d
020 $a 9780438025622
035 $a (MiAaPQ)AAI10744109
035 $a (MiAaPQ)cornellgrad:10716
035 $a AAI10744109
040 $a MiAaPQ $c MiAaPQ
100 1 $a Weller, Daniel L. $0 (orcid)0000-0001-7259-6331 $3 3430524
245 1 0 $a Pathogens, Precipitation, Poop and Produce: The Ecology and Control of Foodborne Pathogens in Produce Preharvest Environments.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 188 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
500 $a Adviser: Martin Wiedmann.
502 $a Thesis (Ph.D.)--Cornell University, 2018.
520 $a The complexity of the global food supply chain, and the demands of a growing population for safe, sustainable food requires novel, holistic, and adaptive approaches to produce safety. However, food is not produced in a vacuum; farms are closely linked to surrounding environments, which can function as pathogen reservoirs as well as pathways for pathogen dispersal into fields. Thus, a comprehensive understanding of the ecological processes that drive the presence, dispersal and persistence of bacterial pathogens in agricultural environments is essential for the development of adaptive approaches to fresh produce safety. In the studies presented here, we employed several approaches to investigate the ecological processes associated with pathogen dispersal in and contamination of produce production environments at multiple scales. Specifically, these studies investigated (i) spatial and temporal risk factors associated with L. monocytogenes isolation at the farm, field and sub-field levels, and (ii) factors associated with the transfer of generic E. coli from contaminated wildlife feces to and survival on individual, preharvest produce items. We observed that foodborne pathogens are not uniformly present in agricultural environments, and that specific spatial (e.g., proximity to pasture) and temporal (e.g., time between a rain event and harvest) factors were associated with an increased likelihood of pathogen detection. Using this information, we validated geospatial models that predict when and where pathogen contamination of produce production environments is likely to occur. We were also able to identify specific management practices that were associated with pathogen contamination of preharvest produce. For example, irrigation water was found to be a key pathway for pathogen dispersal in agricultural environments. The transfer of bacteria from in-field contamination sources, such as wildlife feces, to preharvest produce during irrigation was significantly associated with the distance between the produce and the feces. Following contamination, bacteria were able to survive on in-field produce for > 10 days. Die-off observed over these 10 days followed a biphasic pattern with more rapid die-off immediately following contamination (i.e., 0--106 hours post-contamination). Overall the findings of the studies reported here provide key data that can be used to develop targeted strategies for reducing the likelihood of preharvest produce contamination.
590 $a School code: 0058.
650 4 $a Microbiology. $3 536250
650 4 $a Food science. $3 3173303
650 4 $a Epidemiology. $3 568544
690 $a 0410
690 $a 0359
690 $a 0766
710 2 $a Cornell University. $b Food Science & Technology. $3 3285997
773 0 $t Dissertation Abstracts International $g 79-10B(E).
790 $a 0058
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10744109