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https://www.readbyqxmd.com/read/28934056/determination-of-several-common-disinfection-by-products-in-frozen-foods
#1
Maria Jose Cardador, Mercedes Gallego
Disinfected water and/or disinfectants are commonly used by the freezing industry in such processes as sanitising, washing, blanching, cooling and transporting the final product. For this reason, disinfection by-products (DBPs) can be expected in frozen foods. This study focused on the presence of DBPs in a wide variety of frozen vegetables, meats and fish. For this purpose, the 14 halogenated DBPs more prevalent in disinfected water were selected (4 trihalomethanes, 7 haloacetic acids, 2 haloacetonitriles and trichloronitromethane)...
September 21, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28933662/deficiency-of-serotonin-in-raphe-neurons-and-altered-behavioral-responses-in-tryptophan-hydroxylase-2-knockout-medaka-oryzias-latipes
#2
Satoshi Ansai, Hiroshi Hosokawa, Shingo Maegawa, Kiyoshi Naruse, Youhei Washio, Kenji Sato, Masato Kinoshita
Serotonin (5-hydroxytryptamine [5-HT]) is a bioactive monoamine that acts as a neurotransmitter in the central and peripheral nervous system of animals. Teleost fish species have serotonergic neurons in the raphe nuclei of the brainstem; however, the role of 5-HT in the raphe neurons in teleost fish remains largely unknown. Here, we established a medaka (Oryzias latipes) strain with targeted disruption of tryptophan hydroxylase 2 (tph2) gene that is involved in the 5-HT synthesis in the raphe nuclei. Immunohistochemistry and mass spectrometry analysis revealed that the homozygous mutants (tph2(Δ13/Δ13)) lacked the ability to synthesize 5-HT in the raphe neurons...
September 21, 2017: Zebrafish
https://www.readbyqxmd.com/read/28889979/visual-threat-assessment-and-reticulospinal-encoding-of-calibrated-responses-in-larval-zebrafish
#3
Kiran Bhattacharyya, David L McLean, Malcolm A MacIver
All visual animals must decide whether approaching objects are a threat. Our current understanding of this process has identified a proximity-based mechanism where an evasive maneuver is triggered when a looming stimulus passes a subtended visual angle threshold. However, some escape strategies are more costly than others, and so it would be beneficial to additionally encode the level of threat conveyed by the predator's approach rate to select the most appropriate response. Here, using naturalistic rates of looming visual stimuli while simultaneously monitoring escape behavior and the recruitment of multiple reticulospinal neurons, we find that larval zebrafish do indeed perform a calibrated assessment of threat...
September 6, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28873601/production-and-assessment-of-pacific-hake-merluccius-productus-hydrolysates-as-cryoprotectants-for-frozen-fish-mince
#4
Peter J Jenkelunas, Eunice C Y Li-Chan
The aim of this study was to investigate application of fish protein hydrolysates (FPHs) as cryoprotectants for cod fish mince subjected to freeze-thaw abuse. Response surface methodology revealed little difference in cryoprotectant ability between FPHs produced from Pacific hake muscle within the range of conditions studied, namely Flavourzyme® enzyme/substrate ratio (E/S 1-4%), time (1-6h) and pH (5-7). When added at 4% or higher concentrations, FPH minimized expressible moisture and cook loss, while maximizing salt extractable protein from freeze-thaw abused fish mince, providing similar or better cryoprotection compared to an 8% sucrose-sorbitol blend, and a stabilizing effect of FPH on myosin was observed by differential scanning calorimetry...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28869108/cryopreservation-of-sperm-in-grey-mullet-mugil-cephalus-linnaeus-1758
#5
Ramachandran Balamurugan, Natesan Munuswamy
The aim of this study was to document the effects of cryopreservation on sperm motility and viability in Grey mullet Mugil cephalus. Cryopreservation of sperm was attempted by using two extenders ringer solution for marine fish (RSMF) and V2 extender (V2E) and cryoprotectants dimethylacetamide (DMA), dimethylsulfoxide (DMSO), ethylene glycol (EG), glycerol (GLY), propylene glycol (PG) and methanol (MeOH). Cryoprotectants were assessed at different concentrations individually as well as in combination with varying equilibration times (10 and 30min)...
October 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28862323/a-comparative-study-of-quality-and-safety-of-atlantic-cod-gadus-morhua-fillets-during-cold-storage-as-affected-by-different-thawing-methods-of-pre-rigor-frozen-headed-and-gutted-fish
#6
Irja Sunde Roiha, Ásbjörn Jónsson, Christoph Josef Backi, Bjørn Tore Lunestad, Magnea G Karlsdóttir
BACKGROUND: The catch of marine whitefish is typically seasonal, whereas the land based processing industry has a need for all-year stable supply of raw materials. This challenge can be met by applying fish frozen at sea. When using frozen fish the methods employed for thawing may influence the safety and quality of the final product. This study aimed to investigate the applicability of novel thawing strategies in order to provide an all-year supply of high-quality and safe cod products...
September 1, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28833681/freeze-casting-for-assembling-bioinspired-structural-materials
#7
REVIEW
Qunfeng Cheng, Chuanjin Huang, Antoni P Tomsia
Nature is very successful in designing strong and tough, lightweight materials. Examples include seashells, bone, teeth, fish scales, wood, bamboo, silk, and many others. A distinctive feature of all these materials is that their properties are far superior to those of their constituent phases. Many of these natural materials are lamellar or layered in nature. With its "brick and mortar" structure, nacre is an example of a layered material that exhibits extraordinary physical properties. Finding inspiration in living organisms to create bioinspired materials is the subject of intensive research...
August 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28830085/temperature-induced-lipocalin-til-a-shield-against-stress-inducing-environmental-shocks-in-saccharomyces-cerevisiae
#8
Nadia Maria Berterame, Stefano Bertagnoli, Vera Codazzi, Danilo Porro, Paola Branduardi
The yeast Saccharomyces cerevisiae is a well-established workhorse, either for recombinant or natural products, thanks to its natural traits and easily editable metabolism. However, during a bio-based industrial process it meets multiple stresses generated by operative conditions such as non-optimal temperature, pH, oxygenation and product accumulation. The development of tolerant strains is therefore indispensable for the improvement of production, yield and productivity of fermentative processes. In this regard, plants as resilient organisms are a generous source for fishing genes and/or metabolites that can help the cell factory to counteract environmental constraints...
September 1, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/28807763/effects-of-2-2-4-4-tetrabromodiphenyl-ether-on-neurobehavior-and-memory-change-and-bcl-2-c-fos-grin1b-and-lingo1b-gene-expression-in-male-zebrafish-danio-rerio
#9
Shukai Zheng, Caixia Liu, Yanhong Huang, Mian Bao, Yuanni Huang, Kusheng Wu
Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants in various environmental matrices and organisms and pose a threat to neural systems of organisms. However, though quite a few studies have explored the effect of PBDEs on neural behaviors such as learning and memory abilities in animals, their mechanisms are less known. We used the zebrafish model to evaluate neurotoxicity of PBDEs and observe changes in behavior and related gene expression. In behavioral testing, 50 zebrafish were divided into five groups treated with different concentrations of BDE-47...
October 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28805256/effects-of-euthanasia-methods-on-stable-carbon-%C3%AE-13-c-value-and-nitrogen-%C3%AE-15-n-value-isotopic-composition-of-fry-and-juvenile-rainbow-trout-oncorhynchus-mykiss
#10
Sarah Nahon, Sarah Séité, Joanna Kolasinski, Pierre Aguirre, Inge Geurden
RATIONALE: Carbon and nitrogen stable isotope analyses of fish tissues are now commonly used in ecological studies but mostly require the sacrifice of the animal. Ethical considerations recommend the use of anesthetics for tissue sampling. This study examines how anesthetics affect stable isotope ratios of fish compared with other euthanasia methods. METHODS: Rainbow trout fry and juveniles were sacrificed using ice-freezing (as this common method used to kill fish does not affect natural isotopic ratios), electronarcosis or an overdose of chemical anesthetics (2-phenoxyethanol, benzocaine and clove oil)...
August 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28767740/cryopreservation-of-waigieu-seaperch-psammoperca-waigiensis-sperm
#11
M H Le
BACKGROUND: The cryopreservation protocols have been applied for sperm prevervation of many fish species, but have not been developed for Waigieu seaperch Psammoperca waigiensis, an important aquaculture species in Vietnam. OBJECTIVE: The objectives of this study were to find the best cryoprotectant, extender, freezing method and dilution ratio for sperm cryopreservation of Waigieu seaperch. MATERIALS AND METHODS: An effective protocol was established by comparing different cryodiluents created by mixing various cryoprotectants and extenders...
May 2017: Cryo Letters
https://www.readbyqxmd.com/read/28734242/environmental-estrogen-s-induced-swimming-behavioural-alterations-in-adult-zebrafish-danio-rerio
#12
Basavaraj B Goundadkar, Pancharatna Katti
The present study is an attempt to investigate the effects of long-term (75days) exposure to environmental estrogens (EE) on the swimming behaviour of zebrafish (Danio rerio). Adult zebrafish were exposed semi-statically to media containing commonly detected estrogenic water contaminants (EE2, DES and BPA) at a concentration (5ng/L) much lower than environmentally recorded levels. Time spent in swimming, surface preference, patterns and path of swimming were recorded (6mins) for each fish using two video cameras on day 15, 30 60 and 75...
July 11, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28723226/improving-the-quality-and-safety-of-frozen-muscle-foods-by-emerging-freezing-technologies-a-review
#13
Ximing Zhan, Da-Wen Sun, Zhiwei Zhu, Qi-Jun Wang
Freezing is one of the most widespread used preservation methods for meats including fish meat. Traditional freezing methods such as air blast freezing and cryogenic freezing could induce some quality deterioration such as damage to cell structure, increased drip loss, and poor sensory value. Therefore, novel freezing methods have been developed to minimize the disadvantages of traditional freezing methods. This review describes the enhancement of quality attributes of muscle tissues frozen by novel freezing technologies, including high pressure freezing, electrically and magnetically assisted freezing, ultrasound assisted freezing and antifreeze protein...
July 19, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28714785/effects-of-alcohol-on-inhibitory-avoidance-learning-in-zebrafish-danio-rerio
#14
Ricardo Rodrigues Amorim, Priscila Fernandes Silva, Ana Carolina Luchiari
The zebrafish (Danio rerio) can be used in studies addressing the effects of drugs on learning, memory, and anxiety. In the present study, we investigated the effect of different alcohol treatments (chronic and acute) on the learning and anxiety response of zebrafish in an inhibitory avoidance paradigm. Zebrafish were initially exposed to different alcohol treatments and submitted to an inhibitory avoidance protocol, where an electroshock was applied to the fish as they swam from the white to the black side of a shuttle box tank (naturally preferred environment of zebrafish)...
July 17, 2017: Zebrafish
https://www.readbyqxmd.com/read/28702801/exposure-to-anisakis-extracts-can-induce-inflammation-on-in-vitro-cultured-human-colonic-cells
#15
Antonio Speciale, Domenico Trombetta, Antonella Saija, Antonio Panebianco, Filippo Giarratana, Graziella Ziino, Paola Lucia Minciullo, Francesco Cimino, Sebastiano Gangemi
Anisakis spp. is a parasitic nematode whose infective third-stage larvae may be found within the flesh of fish species commonly consumed by humans. Thorough cooking or freezing should render the fish safe for consumption; furthermore, marinating solutions containing biocidal agents might have a significant action against Anisakis larvae. Some studies suggest a relationship between some parasitic infections and development of inflammatory bowel disorders, and Anisakis infection might be a risk factor for stomach or colon cancer...
July 12, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28669159/simplified-techniques-for-killing-the-carcinogenic-opisthorchis-viverrini-metacercariae-in-cyprinid-fish
#16
Panupan Sripan, Thidarut Boonmars, Jiraporn Songsri, Ratchadawan Aukkanimart, Pranee Sriraj, Panaratana Rattanasuwan, Parichart Boueroy, Apiporn Suwannatrai, Surasit Aunpromma, Narong Khuntikeo, Watcharin Loilome, Nisana Namwat, Puangrat Yongvanit, Aung PhyoWai, Sukhonthip Khueangchaingkhwang, Wu Zhilang, Benjamabhorn Pumhirunroj, Atchara Artchayasawat, Sirintip Boonjaraspinyo
Consumption of fluke-free fish is the most important factor in controlling Opisthorchis viverrini (OV) infection in endemic areas such as northeast Thailand and thereby reducing the risk of cholangiocarcinoma. Cooking fish is the best way to avoid infection; however, the cultural practice of eating raw or fermented fish is difficult to change. We investigated the food preparation process, using freezing, heating and fermentation to kill OV metacercariae in fish. Uncooked cyprinid fish infected with OV were divided into three groups: refrigerated at 4 oC for 24, 48 or 72 h (control group); frozen at -20 oC for 24, 48 or 72 h; or heated by microwaving (at 400 or 800 W) or boiling at 90 oC for 1, 5 or 10 min...
June 25, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28662583/acceleration-and-reaction-mechanism-of-the-n-nitrosation-reaction-of-dimethylamine-with-nitrite-in-ice
#17
Kodai Kitada, Yusuke Suda, Norimichi Takenaka
Some reactions (e.g., oxidation of nitrite, denitrification of ammonium) are accelerated in freeze-concentrated solution (FCS) compared to those in aqueous solution. Ice is highly intolerant to impurities, and the ice excludes those that would accelerate reactions. Here we show the acceleration of the N-nitrosation reaction of dimethylamine (DMA) with nitrite to produce N-nitrosodimethylamine (NDMA) in FCS. NDMA is a carcinogenic compound, and this reaction is potentially accelerated in frozen fish/meat. The eaction rate of the N-nitrosation reaction becomes fastest at specific pH...
July 27, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28602768/effects-of-ultrasound-on-permeation-of-cryoprotectants-into-japanese-whiting-sillago-japonica-embryos
#18
Sheikh Mustafizur Rahman, Carlos Augusto Strüssmann, Toru Suzuki, Sullip Kumar Majhi, Ricardo Shohei Hattori, Md Ariful Alam
Cryopreservation of fish embryos requires the swift uptake of considerable amounts of cryoprotectant (CPA) but this process is hampered by the low permeability of the egg chorion. This study examined the relative efficiency of ultrasound to promote the incorporation of CPAs in two different embryonic developmental stages (somites and tail elongation) of Japanese whiting Sillago japonica and performed a preliminary cryopreservation trial using the best conditions determined during the study. Embryos tolerated ultrasound densities up to 37...
June 8, 2017: Cryobiology
https://www.readbyqxmd.com/read/28602282/multi-class-determination-of-undesirables-in-aquaculture-samples-by-gas-chromatography-tandem-mass-spectrometry-with-atmospheric-pressure-chemical-ionization-a-novel-approach-for-polycyclic-aromatic-hydrocarbons
#19
T Portolés, B Garlito, Jaime Nácher-Mestre, M H G Berntssen, J Pérez-Sánchez
In this work, a method for the analysis of 24 PAHs in 19 different matrices, including fish tissues, feeds and feed ingredients, has been developed using gas chromatography coupled to triple quadrupole tandem mass spectrometry with atmospheric pressure chemical ionization source (GC-APCI-MS/MS). The method is based on a modification of the unbuffered QuEChERS method, using freezing as an additional clean-up step and applying a 20-fold dilution factor to the final extract. The procedure was also tested for 15 pesticides and 7 polychlorinated biphenyl (PCB) congeners in order to widen the scope of the method...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28586692/functional-innovations-and-the-conquest-of%C3%A2-the%C3%A2-oceans-by-acanthomorph-fishes
#20
REVIEW
Peter C Wainwright, Sarah J Longo
The world's oceans are home to many fantastic creatures, including about 16,000 species of actinopterygian, or ray-finned, fishes. Notably, 85% of marine fish species come from a single actinopterygian subgroup, the acanthomorph or spiny-rayed fishes. Here, we review eight functional innovations found in marine acanthomorphs that have been instrumental in the adaptive radiation of this group in the marine realm. Jaw protrusion substantially enhances the suction feeding mechanism found in all fish. Fin spines serve as a major deterrent to predators and enhance the locomotor function of fins...
June 5, 2017: Current Biology: CB
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