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基于不同初始接菌量的銅綠假單胞菌生長(zhǎng)模型
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國(guó)家自然科學(xué)基金資助項(xiàng)目(31271896)、上海市科委重點(diǎn)支撐資助項(xiàng)目(13430502400)、上海市科委長(zhǎng)三角科技聯(lián)合攻關(guān)領(lǐng)域項(xiàng)目(15395810900)和國(guó)家食品安全風(fēng)險(xiǎn)評(píng)估中心2015年委托項(xiàng)目


Modeling on Growth of Pseudomonas aeruginosa with Different Inoculum Sizes
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    摘要:

    基于單細(xì)胞生長(zhǎng)流動(dòng)成像系統(tǒng),,探究銅綠假單胞菌單細(xì)胞生長(zhǎng)規(guī)律,并運(yùn)用隨機(jī)建模方法建立單細(xì)胞與群體細(xì)胞生長(zhǎng)之間的關(guān)系,,獲得不同初始接菌量下銅綠假單胞菌生長(zhǎng)遲滯時(shí)間以及最大生長(zhǎng)速率的分布,通過代入Baranyi模型修改式,,結(jié)合單細(xì)胞水平建模(Individual-based modeling,,IbM)的方法,對(duì)不同初始接菌量下銅綠假單胞菌的隨機(jī)生長(zhǎng)過程進(jìn)行模擬,。結(jié)果表明,,隨著初始接菌量的增大,銅綠假單胞菌生長(zhǎng)遲滯期減小,,25℃下平均遲滯時(shí)間由2.91 h減小至2.55 h,變異系數(shù)由29.90%減小至2.96%,,35℃下平均遲滯時(shí)間由1.49 h減小至0.99 h,,變異系數(shù)由22.53% 減小至4.64%。最大生長(zhǎng)速率隨不同初始接菌量變化不明顯,,其主要受溫度的影響,,由25℃下約0.70 lnCFU/h增加至35℃下約1.00 lnCFU/h,變異系數(shù)變化無明顯規(guī)律,。通過IbM模擬群體細(xì)胞生長(zhǎng)發(fā)現(xiàn),,雖然單細(xì)胞的生長(zhǎng)具有隨機(jī)性,但隨著初始接菌量的增大,,微生物群體細(xì)胞生長(zhǎng)的變異性逐漸降低,,最終呈現(xiàn)出決定性生長(zhǎng)的狀態(tài)。相較于傳統(tǒng)采用確定性模型進(jìn)行的微生物生長(zhǎng)建模,,單細(xì)胞水平的生長(zhǎng)動(dòng)力學(xué)研究可為食品安全風(fēng)險(xiǎn)評(píng)估以及風(fēng)險(xiǎn)決策者提供更加準(zhǔn)確與直觀的風(fēng)險(xiǎn)指導(dǎo),。

    Abstract:

    A single cell growth image system was used to study the growth of Pseudomonas aeruginosa single cells. A stochastic modeling process was applied to connect the growth of P. aeruginosa single cells and cell populations, which made it possible to simulate the growth of P. aeruginosa . The lag time and specific growth rate distributions with different inoculum sizes were obtained as a result of the simulation’s repetitive executions which were further introduced into the reduced Baranyi model for establishing an individual-based model. Then a stochastic growth process of P. aeruginosa was conducted by using Monte Carlo simulation. Results showed that a negative relationship existed between lag time and inoculum size. As the inoculum size increased from 1 cell to 100 cells, the lag time decreased from 2.91 h to 2.55 h at 25℃ and from 1.49 h to 0.99 h at 35℃. The coefficient of variation decreased from 29.90% to 2.96% at 25℃ and from 22.53% to 4.64% at 35℃. The specific growth rate was more affective to the temperature changes which increased from 0.70 lnCFU/h at 25℃ to 1.00 lnCFU/h at 35℃. Meanwhile, the stochastic growth of P. aeruginosa with different inoculum sizes demonstrated that the growth of P. aeruginosa showed a determinate tendency as inoculum sizes increasing, in spite of the stochastic growth property of bacterial single cells. Compared with the traditional determinate predictive modelling, studying bacterial population growth from stochastic single cell dynamics opened the door for applications in risk assessment and prediction of shelf life.

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董慶利,王忻,蘇亮,劉箐.基于不同初始接菌量的銅綠假單胞菌生長(zhǎng)模型[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2015,46(12):246-252. Dong Qingli, Wang Xin, Su Liang, Liu Qing. Modeling on Growth of Pseudomonas aeruginosa with Different Inoculum Sizes[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(12):246-252.

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  • 在線發(fā)布日期: 2015-12-10
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