Food Science Commons^™

The Differences Of Prokaryotic Pan-Genome Analysis On Complete Genomes And Simulated Metagenome-Assembled Genomes, Tang Li

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Metagenomic assembly is often used in microbiome research. In metagenomic assembly, contigs are binned based on the shared nucleotide composition. These contig bins are called metagenome-assembled genomes (MAGs), each representing a unique bacterial genome recovered from metagenome sequencing. Hundreds of thousands of high-quality MAGs of various ecological environments have been published since 2017, and increasingly more MAGs are being used in pan-genome analyses where unculturable species or species without reference genomes are studied in microbiome research. However, compared to the traditional pan-genome analysis that uses isolate genomes (from a pure strain isolated from a mixed bacterial population), it is not …

Investigating The Prevalence And Control Of Listeria Monocytogenes In Food Facilities, Cyril Nsom Ayuk Etaka

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Small and very small food facilities in the ready-to-eat food industry face difficulties complying with the Food Safety Modernization Act-Preventive Controls for Human Food rule (FSMA-PCHF). This regulation highlights the need for sanitation to control environmental pathogens like Listeria monocytogenes. The main goal of this project was to investigate the prevalence and control of Listeria monocytogenes in food facilities. This study provides technical assistance to facilities to comply with the PCHF rule and addresses sanitation alternatives for food contact surfaces like aqueous ozone.

First, the prevalence of Listeria spp and L. monocytogenes in small and very small food manufacturing …

Developing A Lab-Scale Fluidized Bed Dryer System To Enhance Rough Rice Drying Process, Kaushik Luthra

Graduate Theses and Dissertations

For more than half of the world's population, rice (Oryza sativa L.) is a staple meal. However, rice growers encounter difficulties supplying this demand, particularly in developing nations, where rice is susceptible to spoilage if the moisture content is not lowered to a safe level soon after harvest. As a result, traditional drying methods, such as sun drying and natural air drying, are commonly used by rice growers, particularly in underdeveloped nations. However, these procedures are time-consuming and can lead to rice spoilage. On the other hand, fluidized bed drying is a well-established technology that might give rice growers a …

Enhancement Of Dry-Aged Beef Quality By Dietary Supplementation Of High Levels Of Vitamin E, David Manuel Velazco Marroquin

Department of Animal Science: Dissertations, Theses, and Student Research

Crossbred cattle (n = 150; 10/pen) were grain-finished with the dietary addition of 2,200 international units of vitamin E (α-tocopherol) per head per day for 100 days. One low-Choice carcass (n = 12) was selected, and strip loins were collected. Low Choice control carcasses (n = 12) were randomly selected from commercial, fed-cattle production to serve as controls. Strip loins were randomly assigned to wet or dry aging for 42 days. On day 42, control dry-aged and control wet-aged loins had the highest TBARS values and vitamin E wet and dry-aged loins had lower TBARS values ( …

Crisis Communication, Anticipated Food Scarcity, And Food Preferences: Preregistered Evidence Of The Insurance Hypothesis, Michal Folwarczny, Jacob D. Christensen, Norman P. Li, Valdimar Sigurdsson, Tobias Otterbring

Research Collection School of Social Sciences

Whereas large-scale consumption of energy-dense foods contributes to climate change, we investigated whether exposure to climate change-induced food scarcity affects preferences toward these foods. Humans? current psychological mechanisms have developed in their ancestral evolutionary past to respond to immediate threats and opportunities. Consequently, these mechanisms may not distinguish between cues to actual food scarcity and cues to food scarcity distant in time and space. Drawing on the insurance hypothesis, which postulates that humans should respond to environmental cues to food scarcity through increased energy consumption, we predicted that exposing participants to climate change-induced food scarcity content increases their preferences toward …

The Persistence Of Human Norovirus Surrogate In Leafy Greens Production System, Wenjun Deng

Graduate Theses and Dissertations

Since mostly consumed raw, foodborne pathogen contamination of leafy greens has led to a large number of foodborne disease outbreaks and illnesses each year in the United States. Human noroviruses (hNoV) are the most common viral pathogen transmitted by leafy greens. In this dissertation, the persistence of the hNoV surrogate Tulane virus (TV) on pre-harvest lettuce and microgreens was investigated. Lettuces are the most studied leafy green model, while previous hNoV research has mainly focused on the post-harvest stage of production. Here, pre-harvest hydroponically grown lettuce were used to determine TV persistence on leafy greens. After inoculation on leaves at …

1h-Cyclopropabenzene And 1h-Cyclopropa[B]Naphthalene Fumigation Downregulates Ethylene Production And Maintains Fruit Quality Of Controlled Atmosphere Stored ‘Granny Smith’ Apple, Vijay Y. Tokala, Zora Singh, Poe N. Kyaw

Research outputs 2014 to 2021

The ‘Granny Smith’ is a commercial apple cultivar in Western Australia and popular in the apple world as well, for its unique green colour and flavour. The effects of two new ethylene antagonists namely 1H-cyclopropabenzene (BC) and 1H-cyclopropa[b]naphthalene (NC), as well as 1-methylcyclopropene (1-MCP) on ethylene production, rates of respiration and fruit quality were investigated in controlled atmosphere (CA) stored ‘Granny Smith’ apple. The apple fruit were fumigated with 1 μM BC (0.09 μL.L−1) or 1 μM NC (0.14 μL.L−1) or 18 μM (1 μL.L−1) 1-MCP for 18 h at room temperature (20 ± 2 °C and 65 ± 5% …

Handling Of Spurious Sequences Affects The Outcome Of High-Throughput 16s Rrna Gene Amplicon Profiling, Sandra Reitmeier, Thomas C. A. Hitch, Nicole Treichel, Nikolaos Fikas, Bela Hausmann, Amanda E. Ramer-Tait, Klaus Neuhaus, David Berry, Dirk Haller, Ilias Lagkouvardos, Thomas Clavel

Department of Food Science and Technology: Faculty Publications

16S rRNA gene amplicon sequencing is a popular approach for studying microbiomes. However, some basic concepts have still not been investigated comprehensively. We studied the occurrence of spurious sequences using defined microbial communities based on data either from the literature or generated in three sequencing facilities and analyzed via both operational taxonomic units (OTUs) and amplicon sequence variants (ASVs) approaches. OTU clustering and singleton removal, a commonly used approach, delivered approximately 50% (mock communities) to 80% (gnotobiotic mice) spurious taxa. The fraction of spurious taxa was generally lower based on ASV analysis, but varied depending on the gene region targeted …

Research Progress On The Mechanism Of Seaweed Dietary Fiber In Improving Inflammatory Bowel Disease （Ibd）, Cao Jun-Han, Lin Peng-Cheng, Wang Yan-Feng, Miao Jin-Lai, Xie Wan-Cui

Food and Machinery

Based on the inflammatory bowel disease （IBD） experimental model in dietary fiber in seaweed, we summarized its function in protecting intestinal mucosal barrier and host immune system, and emphasized its direct mechanism of inhibiting immune cell infiltration, regulating oxidative stress level, protecting antioxidant defense system, regulating intestinal tight junction protein and balancing inflammatory factors level. The indirect mechanism of intestinal microbiota mediated Short chain fatty acids （SCFA） targeting IBD protection was also discussed, and the research direction of dietary fiber in seaweed in the improvement mechanism of IBD and other intestinal diseases was proposed.

Effect Of Dynamic High-Pressure Micro-Fluidization Treatment On Physicochemical And Structural Properties Of Square Bamboo Shoots Dietary Fiber, Tang Cai-Die, Zhang Fu-Sheng, Yang Jin-Lai, Wu Liang-Ru, Zheng Jiong

Food and Machinery

To explore the effect on the physicochemical and structural properties of thebamboo shoots dietary fiber （BSDF）, square bamboo shoots dietary fiber was used toas raw material to obtain BSDF with different pressure （0, 50, 100, 150, 200 MPa） by dynamic high pressure micro-fluidization （DHPM） treatment. Results showed that as the treatment pressure increases, the particle size of BSDF firstly increased and then decreased. When the treatment pressure was up to 150 MPa, the particle size reached the minimum （370±11） nm. The water holding capacity, oil holding capacity and swelling capacity reached the maximum, which were increased by 47.74%, 50.54% and …

Effects Of Microwave On The Structural And Functional Properties Of Dietary Fibers From Different Sources, Luo Sun-Jing, Xie Liang, Xiong Shao-Bai, Yang Rong, Chen Ting-Ting, Deng Li-Ping, Liu Cheng-Mei

Food and Machinery

The microwave was used to modify the dietary fibers (DFs) in sweet potato pomace, apple pomace, and soybean pomace. The changes in the structural properties of three kinds of DFs by microwave were investigated by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis. Moreover, the functional properties, including water holding capacity, oil holding capacity, cholesterol adsorption capacity and nitrite ions adsorption capacity, were evaluated in this study. The results showed that microwave was an excellent modification method that could expose the accessibility margin, increase crystallinity, strengthen thermal stability, and improve the functional properties of three dietary fibers to varying degrees. …

Maslinic Acid Protects Against Lps-Induced Inflammatory Response In Raw264.7 Cells By Regulating Phosphorylation Of Stat3, Yue Cai-Xia, Chen Lei, Wang Wen-Kui, Li Gui-Lan, Hu Yong-Ting

Food and Machinery

In the paper, the protective effect of maslinic acid (MA) on LPS-induced inflammatory response in RAW264.7 cells was investigated, and its inhibition of transcription 3 (STAT3) phosphorylation, a signal transducer and activator, was also explored. NO generation was measured by Griess method. The levels of IL-6, IL-1β and IL-10 were detected by ELISA. The relative expression of iNOS, p-STAT3, p-JAK2 and SOCS3 were determined by Western blot. The release of reactive oxygen (ROS) was evaluated using DCFH-DA fluorescence. Results showed that MA could significantly inhibit the NO generation and the production of ROS. MA also decreased the releases of IL-6 …

Screening And Identification Of A Strain Of Saccharomyces Cerevisiae And Its Characteristics, Xiang Li-Ping, Fan Bin-Qiang, Yang Zhi-Long, Wu Qiang, Yu You-Gui

Food and Machinery

Based on the problems of high acidity and high residual sugar content in the process of strong-flavor liquor production, the yeast in medium and high temperature Daqu was preliminarily identified by plate streaking purification, WL medium morphology observation and microscope observation. Then, the yeasts with strong acid resistance and alcohol production ability were screened by TTC medium staining and differential acidity medium, and the molecular biology identification, biological characteristics and fermentation test of fermented grains were carried out. The results showed that the strain dq1 screened in medium and high temperature Daqu had strong growth activity at pH 3.0, and …

Analysis And Evaluation Of Nutrient Components Of Different Strains Of Flammulina Filiformis, Lu Huan, Wang Rui-Juan, Liu Jian-Yu, Song Chun-Yan, Shang Xiao-Dong

Food and Machinery

Using J6932, J6933, J6934, J6935, J4137, J5128, J6759, J5849 and J6284 as materials, the nutrient components and mineral elements of different varieties of Flammulina filiformis were determined. The amino acid composition was analyzed by AAS, CS and RC. The 9 strains of Flammulina filiformis were rich in nutrition, high in K, low in Na, heavy metal content was far below the detection limit index, and they were all low in fat and high in protein products. The contents of glutamate, methionine, aspartate and leucine accounted for 53.25% of the total amino acids. The total contents of essential amino acids ranged …

Study Of Mechanical Characteristics And Reliability On Cracked Vertical Retort, Li Jing-Li, Zhang Li-Mei, Wu Dan, Qi Bing

Food and Machinery

Taking the vertical retort on a continuous basket-less sterilization production line as the research object, analyzed the cracked retort considering the temperature and water pressure. At the same time, the cracks were set as a random variable and the influence factors on the reliability of the retort were analyzed by the random finite element method. Firstly, the geometric model was built by SolidWorks, then the mechanical properties and reliability were calculated by ANSYS. The results showed that: compared with the water pressure, the temperature had a great influence on the mechanical properties of the retort. To the cracked retort, the …

Recognition Of Micro Parts Based On Quantum Convolution Neural Network Algorithm, He Rui, Ding Ze-Qing

Food and Machinery

The representation layer, hidden layer and output layer neuron models of quantum convolution neural network were designed. Modified linear activation function Relu was used as the activation function, and the quantum rotation angle and neural connection weight were optimized by training error function. The simulation results of eight kinds of micro parts show that the recognition accuracy of quantum convolution neural network algorithm is higher, the time consumption is less and the recognition effect is better than other algorithms.

Research On The Interaction Of Food Packaging Design From The Perspective Of Cross-Border Integration, Zhang Da-Lu, Ye Kai-Ting

Food and Machinery

Through the analysis of the interaction of food packaging design, the paper analyzes the rationality of cross-border food packaging design by using the cross-border joint named food packaging design cases in the market, and provides innovative ideas for design on some problems exposed.

Research On Multi-Sensory Design Ideas Of Children's Snack Packaging, Huang Wei

Food and Machinery

This article first introduces the content of multi-sensory design theory, and secondly summarizes the relevant research status at home and abroad, and then analyzes the packaging design principles of children’s snacks based on children’s cognitive psychology, finally explored the design methods of children's snack packaging under the multi-sensory design theory from the visual sensory communication design, the tactile sensory communication design, the auditory sensory communication design and olfactory sensory communication design.

The Effect Of Ice Storage And Delivery Method On The Fresh-Keeping Effect Of Plum, Li Jing-Yi, Wang Zeng-Li, Chang Ping, Liu Huan, Wang Fu-Ying

Food and Machinery

“Nongda No.7” plum was used as the test material, and the changes of fruit quality and physiological and biochemical indexes under different storage conditions (-0.5 ℃ and 4 ℃) were analyzed to explore the effect of ice temperature storage on plum fruit storage and preservation effect. The biochemical indexes, aging degree and anti-oxidation ability of plum were explored during storage. Meanwhile, four types of delivery methods were adopted for the plums stored at ice temperature. By comparing the titratable acid, VC, flavonoids, and total phenol contents of plums after being shipped out of the warehouse, the nutrient components of plums …

Duck Egg Surface Defect Detection Based On Improved Googlenet, Xiao Wang, Yang Yu-Jun, Shen Qi-Fang, Shan Sen-Sen, Huang Yue

Food and Machinery

A method of duck egg surface defect detection based on improved GoogLeNet （GoogLe Net-Mini） was proposed, and the other three neural networks include GoogLeNet, VGG16 and AlexNet were compared. The results showed that the accuracy of the four networks were 95.88%, 94.16%, 92.75% and 85.43% respectively. The detection accuracy of GoogLeNet-Mini for three kinds of duck eggs （normal, dirty and damaged） was 98.43%, 97.45% and 95.88% respectively. Compared with GoogLeNet, VGG16 and AlexNet, GoogLeNet-Mini had higher accuracy, better generalization and robustness, and the detection accuracy of three types of duck eggs can meet the production requirements. The detection range is …