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https://www.readbyqxmd.com/read/28444305/dissemination-of-gastroenteric-viruses-in-the-production-of-lettuce-in-developing-countries-a-public-health-concern
#1
Lucia M C Werneck, Carmen B Vieira, Tulio M Fumian, Thalles Borges Caetano, Jarbas Emílio Dos Santos, Fernando César Ferreira, Marcia Maria Pimenta, Marize P Miagostovich
Investigation of major viruses responsible for acute viral gastroenteritis, such as norovirus (NoV), rotavirus species A (RVA) and human adenovirus (HAdV), was conducted in the mountainous region of the state of Rio de Janeiro in a lettuce-producing area. Irrigation water and lettuce samples were collected at different production stages. Viruses were concentrated using an adsorption-elution method and detected by quantitative polymerase chain reaction (qPCR). We detected HAdV in all collection points, although no virus infectivity was shown...
April 21, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28440966/lead-levels-in-vegetables-from-artisanal-mining-sites-of-dilimi-river-bukuru-and-barkin-ladi-north-central-nigeria-cancer-and-non-cancer-risk-assessment
#2
Orish Ebere Orisakwe, Emmanuel Ayuba Dagur, Herbert Orji Chidi Mbagwu, Nnaemeka Arinze Udowelle
Lead (Pb) contamination of foods and especially of frequently consumed vegetables is a growing public health concern worldwide. Although levels of exposure in developed countries have declined over the past decades, the same cannot be said of developing countries. Health risk assessment has increasingly been employed to determine the potential hazard of heavy metal exposure to humans. In this study vegetable samples (tomatoes, red pepper, brown beans, lettuce, cabbage, Irish potatoes, onions, green beans and carrot), soil samples, irrigation water and sediment samples were collected from the Dilimi River, Bukuru and Barkin Ladi communities in north central Nigeria and analyzed for Pb content using atomic absorption spectroscopy...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28440376/occurrence-of-perchlorate-in-groundwater-paired-farmland-soil-lettuce-and-rhizosphere-soil-from-chengdu-china
#3
Yulu Tang, Bifeng Zhong, Bing Qu, Shujin Feng, Sanglan Ding, Shijun Su, Zhi Li, Zhiwei Gan
A total of 28 groundwater, paired farmland soil, lettuce, and its rhizosphere soil samples were collected from Chengdu, China to detect perchlorate levels and to evaluate the relationships of perchlorate concentrations among these matrices. The perchlorate concentrations in the groundwater, farmland soil, lettuce, and rhizosphere soil samples ranged from below detection limit to 60.2 μg L(-1), from below detection limit to 249 μg kg(-1) dry weight (dw), from 2.07 to 1010 μg kg(-1) wet weight, and from below detection limit to 314 μg kg(-1) dw, respectively...
April 25, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28437741/use-of-nuclear-receptor-luciferase-based-bioassays-to-detect-endocrine-active-chemicals-in-a-biosolids-biochar-amended-soil
#4
Carolyn G Anderson, Geetika Joshi, Daniel A Bair, Charlotte Oriol, Guochun He, Sanjai J Parikh, Michael S Denison, Kate M Scow
Biosolids are a potentially valuable source of carbon and nutrients for agricultural soils; however, potential unintended impacts on human health and the environment must be considered. Virtually all biosolids contain trace amounts endocrine-disrupting chemicals derived from human use of pharmaceuticals and personal care products (PPCPs). One potential way to reduce the bioavailability of PPCPs is to co-apply biosolids with biochar to soil, because biochar's chemical (e.g., aromaticity) and physical properties (e...
April 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28428007/identification-and-characterization-of-two-rna-silencing-suppressors-encoded-by-ophioviruses
#5
Gabriel Robles Luna, Carina A Reyes, Eduardo J Peña, Eliana Ocolotobiche, Cecilia Baeza, Maria Belén Borniego, Richard Kormelink, María Laura García
Citrus psorosis virus and Mirafiori lettuce big-vein virus are two members of the genus Ophiovirus, family Ophioviridae. So far, how these viruses can interfere in the antiviral RNA silencing pathway is not known. In this study, using a local GFP silencing assay on Nicotiana benthamiana, the 24K-25K and the movement protein (MP) of both viruses were identified as RNA silencing suppressor proteins. Upon their co-expression with GFP in N. benthamiana 16c plants, the proteins also showed to suppress systemic RNA (GFP) silencing...
April 17, 2017: Virus Research
https://www.readbyqxmd.com/read/28425569/a-comparative-study-of-natural-antimicrobial-delivery-systems-for-microbial-safety-and-quality-of-fresh-cut-lettuce
#6
Laura E Hill, Daniela A Oliveira, Katherine Hills, Cassie Giacobassi, Jecori Johnson, Harvey Summerlin, T Matthew Taylor, Carmen L Gomes
Nanoencapsulation can provide a means to effectively deliver antimicrobial compounds and enhance the safety of fresh produce. However, to date there are no studies which directly compares how different nanoencapsulation systems affect fresh produce safety and quality. This study compared the effects on quality and safety of fresh-cut lettuce treated with free and nanoencapsulated natural antimicrobial, cinnamon bark extract (CBE). A challenge study compared antimicrobial efficacy of 3 different nanoencapsulated CBE systems...
April 20, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28423420/functional-response-of-eretmocerus-delhiensis-on-trialeurodes-vaporariorum-by-parasitism-and-host-feeding
#7
Jafar Ebrahimifar, Arsalan Jamshidnia, Hossein Allahyari
The parasitoid wasp, Eretmocerus delhiensis (Hymenoptera, Aphelinidae) is a thelytokous and syn-ovigenic parasitoid. To evaluate E. delhiensis as a biocontrol agent in greenhouse, the killing efficiency of this parasitoid by parasitism and host-feeding, were studied. Killing efficiency can be compared by estimation of functional response parameters. Laboratory experiments were performed in controllable conditions to evaluate the functional response of E. delhiensis at eight densities (2, 4, 8, 16, 32, 64, 100, and 120 third nymphal stage) of Trialeurodes vaporariorum (Hemiptera, Aleyrodidae) on two hosts including; tomato and prickly lettuce...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28419665/lettuce-produced-hepatitis-c-virus-e1e2-heterodimer-triggers-immune-responses-in-mice-and-antibody-production-after-oral-vaccination
#8
Jihong Liu Clarke, Lisa Paruch, Mihaela-Olivia Dobrica, Iuliana Caras, Catalin Tucureanu, Adrian Onu, Sonya Ciulean, Crina Stavaru, Andre Eerde, Yanliang Wang, Hege Steen, Sissel Haugslien, Catalina Petrareanu, Catalin Lazar, Ioan Popescu, Ralph Bock, Jean Dubuisson, Norica Branza-Nichita
The hepatitis C virus (HCV) is a major etiologic agent for severe liver diseases (e.g., cirrhosis, fibrosis and hepatocellular carcinoma). Approximately 140 million people have chronic HCV infections and about 500,000 die yearly from HCV-related liver pathologies. To date, there is no licenced vaccine available to prevent HCV infection and production of an HCV vaccine remains a major challenge. Here we report the successful production of the HCV E1E2 heterodimer, an important vaccine candidate, in an edible crop (lettuce, Lactuca sativa) using Agrobacterium-mediated transient expression technology...
April 17, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28419127/effects-of-nitrogen-application-rate-nitrogen-synergist-and-biochar-on-nitrous-oxide-emissions-from-vegetable-field-in-south-china
#9
Qiong Yi, Shuanghu Tang, Xiaolin Fan, Mu Zhang, Yuwan Pang, Xu Huang, Qiaoyi Huang
Globally, vegetable fields are the primary source of greenhouse gas emissions. A closed-chamber method together with gas chromatography was used to measure the fluxes of nitrous oxide (N2O) emissions in typical vegetable fields planted with four vegetables sequentially over time in the same field: endive, lettuce, cabbage and sweet corn. Results showed that N2O fluxes occurred in pulses with the N2O emission peak varying greatly among the crops. In addition, N2O emissions were linearly associated with the nitrogen (N) application rate (r = 0...
2017: PloS One
https://www.readbyqxmd.com/read/28411511/elevated-co2-and-salinity-are-responsible-for-phenolics-enrichment-in-two-differently-pigmented-lettuces
#10
Cristina Sgherri, Usue Pérez-López, Francesco Micaelli, Jon Miranda-Apodaca, Amaia Mena-Petite, Alberto Muñoz-Rueda, Mike Frank Quartacci
Both salt stress and high CO2 level, besides influencing secondary metabolism, can affect oxidative status of plants mainly acting in an opposite way with salinity provoking oxidative stress and elevated CO2 alleviating it. The aim of the present work was to study the changes in the composition of phenolic acids and flavonoids as well as in the antioxidant activity in two differently pigmented lettuce cvs (green or red leaf) when submitted to salinity (200 mM NaCl) or elevated CO2 (700 ppm) or to their combination in order to evaluate how a future global change can affect lettuce quality...
April 7, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28401891/genome-assembly-with-in-vitro-proximity-ligation-data-and-whole-genome-triplication-in-lettuce
#11
Sebastian Reyes-Chin-Wo, Zhiwen Wang, Xinhua Yang, Alexander Kozik, Siwaret Arikit, Chi Song, Liangfeng Xia, Lutz Froenicke, Dean O Lavelle, María-José Truco, Rui Xia, Shilin Zhu, Chunyan Xu, Huaqin Xu, Xun Xu, Kyle Cox, Ian Korf, Blake C Meyers, Richard W Michelmore
Lettuce (Lactuca sativa) is a major crop and a member of the large, highly successful Compositae family of flowering plants. Here we present a reference assembly for the species and family. This was generated using whole-genome shotgun Illumina reads plus in vitro proximity ligation data to create large superscaffolds; it was validated genetically and superscaffolds were oriented in genetic bins ordered along nine chromosomal pseudomolecules. We identify several genomic features that may have contributed to the success of the family, including genes encoding Cycloidea-like transcription factors, kinases, enzymes involved in rubber biosynthesis and disease resistance proteins that are expanded in the genome...
April 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28400014/isolation-molecular-identification-and-quinolone-susceptibility-testing-of-arcobacter-spp-isolated-from-fresh-vegetables-in-spain
#12
Ana González, Isidro Favián Bayas Morejón, María Antonia Ferrús
Some species of the Arcobacter genus are considered emerging foodborne and waterborne enteropathogens. However, the presence of Arcobacter spp. in vegetables very little is known, because most studies have focused on foods of animal origin. On the other hand, quinolones are considered as first-line drugs for the treatment of infection by campylobacteria in human patients, but few data are currently available about the resistance levels to these antibiotics among Arcobacter species. Therefore, the aim of this study was to investigate the presence and diversity of arcobacters isolated from fresh vegetables such as lettuces, spinaches, chards and cabbages...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28400006/microbiological-quality-of-selected-ready-to-eat-leaf-vegetables-sprouts-and-non-pasteurized-fresh-fruit-vegetable-juices-including-the-presence-of-cronobacter-spp
#13
Anna Berthold-Pluta, Monika Garbowska, Ilona Stefańska, Antoni Pluta
Bacteria of the genus Cronobacter are emerging food-borne pathogens. Foods contaminated with Cronobacter spp. may pose a risk to infants or adults with suppressed immunity. This study was aimed at determining the microbiological quality of ready-to-eat (RTE) plant-origin food products available on the Polish market with special emphasis on the prevalence of Cronobacter genus bacteria. Analyses were carried out on 60 samples of commercial RTE type plant-origin food products, including: leaf vegetables (20 samples), sprouts (20 samples) and non-pasteurized vegetable, fruit and fruit-vegetable juices (20 samples)...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28399992/microbial-quality-of-irrigation-water-used-in-leafy-green-production-in-southern-brazil-and-its-relationship-with-produce-safety
#14
Luana Tombini Decol, Letícia Sopeña Casarin, Claudia Titze Hessel, Ana Carolina Fösch Batista, Ana Allende, Eduardo César Tondo
Irrigation water has been recognized as an important microbial risk factor for fruits and vegetables in many production areas, but there is still a lack of information about how the microbiological quality of different irrigation water sources and climatic conditions influence the safety of vegetables produced in Brazil. This study evaluated the distribution of generic E. coli and the prevalence of E. coli O157:H7 in two different water sources (ponds and streams bordering farmlands and urban areas) used for irrigation and on commercially produced lettuces in Southern Brazil...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28399991/in-package-inhibition-of-e-%C3%A2-coli-o157-h7-on-bulk-romaine-lettuce-using-cold-plasma
#15
Sea C Min, Si Hyeon Roh, Brendan A Niemira, Glenn Boyd, Joseph E Sites, Joseph Uknalis, Xuetong Fan
Dielectric barrier discharge atmospheric cold plasma (DACP) treatment was evaluated for the inactivation of Escherichia coli O157:H7, surface morphology, color, carbon dioxide generation, and weight loss of bulk Romaine lettuce in a commercial plastic clamshell container. The lettuce samples were packed in a model bulk packaging configuration (three rows with either 1, 3, 5, or 7 layers) in the container and treated by DACP (42.6 kV, 10 min). DACP treatment reduced the number of E. coli O157:H7 in the leaf samples in the 1-, 3-, and 5-layer configurations by 0...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28399225/aedeomyia-squamipennis-diptera-culicidae-in-florida-usa-a-new-state-and-country-record
#16
Nathan D Burkett-Cadena, Erik M Blosser
Aedeomyia squamipennis (Lynch Arribalzaga) is a tropical mosquito (Diptera: Culicidae) found throughout most of the American Tropics, from eastern Mexico through Argentina, including several Caribbean islands. Larvae are typically associated with bodies of water with dense growths of aquatic vegetation, particularly Pistia stratiotes L., water lettuce. Adult females feed predominantly on the blood of birds and seek hosts in forest canopies. Aedeomyia squamipennis is considered an important vector of Gamboa virus and avian malaria, and is also suspected of transmitting Venezuelan equine encephalitis virus...
February 8, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28396881/allelopathic-activity-of-extracts-from-different-brazilian-peanut-arachis-hypogaea-l-cultivars-on-lettuce-lactuca-sativa-and-weed-plants
#17
G S Casimiro, E Mansur, G Pacheco, R Garcia, I C R Leal, N K Simas
Peanut (Arachis hypogaea L.) is the fourth most consumed oleaginous plant in the world, producing seeds with high contents of lipids, proteins, vitamins, and carbohydrates. Biological activities of different extracts of this species have already been evaluated by many researchers, including antioxidant, antitumoral, and antibacterial. In this work, the allelopathic activity of extracts from different Brazilian peanut cultivars against lettuce (Lactuca sativa) and two weed plants (Commelina benghalensis and Ipomoea nil) was studied...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28383257/copper-oxide-nanoparticle-foliar-uptake-phytotoxicity-and-consequences-for-sustainable-urban-agriculture
#18
TianTian Xiong, Camille Dumat, Vincent Dappe, Hervé Vezin, Eva Schreck, Muhammad Shahid, Antoine Pierart, Sophie Sobanska
Throughout the world, urban agriculture supplies fresh local vegetables to city populations. However, the increasing anthropogenic uses of metal-containing nanoparticles (NPs) such as CuO-NPs in urban areas may contaminate vegetables through foliar uptake. This study focused on the CuO-NP transfer processes in leafy edible vegetables (i.e., lettuce and cabbage) to assess their potential phytotoxicity. Vegetables were exposed via leaves for 5, 10, or 15 days to various concentrations of CuO-NPs (0, 10, or 250 mg per plant)...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28383254/distribution-bioaccumulation-trophic-transfer-and-influences-of-ceo2-nanoparticles-in-a-constructed-aquatic-food-web
#19
Xingchen Zhao, Miao Yu, Dan Xu, Aifeng Liu, Xingwang Hou, Fang Hao, Yanmin Long, Qunfang Zhou, Guibin Jiang
In view of the final destination of nanomaterials, the water system would be the important sink. However, the environmental behavior of nanomaterials is rather confusing due to the complexity of the real environment. In this study, a fresh water ecosystem, including water, sediment, water lettuce, water silk, Asian clam, snail, water flea, the Japanese Medaka, and the Yamato shrimp, was constructed to study the distribution, bioaccumulation and potential impacts of CeO2 nanoparticles (CeO2 NPs) via long-term exposure...
April 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28377761/changes-in-gene-transcription-induced-by-hydrogen-peroxide-treatment-of-verotoxin-producing-escherichia-coli-o157-h7-and-non-o157-serotypes-on-romaine-lettuce
#20
Gui-Ying Mei, Joshua Tang, Susan Bach, Magdalena Kostrzynska
Disease outbreaks of verotoxin-producing Escherichia coli (VTEC) O157:H7 and non-O157 serotypes associated with leafy green vegetables are becoming a growing concern. A better understanding of the behavior of VTEC, particularly non-O157 serotypes, on lettuce under stress conditions is necessary for designing more effective control strategies. Hydrogen peroxide (H2O2) can be used as a sanitizer to reduce the microbial load in leafy green vegetables, particularly in fresh produce destined for the organic market...
2017: Frontiers in Microbiology
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