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Kaplan-Levy R.N.,Israel Oceanographic And Limnological Research | Hadas O.,Israel Oceanographic And Limnological Research | Summers M.L.,California State University, Northridge | Rucker J.,Fresh Technology | Sukenik A.,Israel Oceanographic And Limnological Research
Topics in Current Genetics | Year: 2010

Cyanobacteria are an ancient and morphologically diverse group of photosynthetic prokaryotes, which were the first to evolve oxygenic photosynthesis. Cyanobacteria are widely distributed in diversed environments. In the case of members of the orders Nostocales and Stigonematales, their persistence and success were attributed to their ability to form specialized cells: heterocysts, capable of fixing atmospheric nitrogen and spore-like cells, the akinetes. This review focuses on akinetes of Nostocales, emphasizing environmental triggers and cellular responses involved in differentiation, maturation, dormancy, and germination of these resting cells. Morphological and structural changes, variation in akinete composition, and metabolism are summarized. Special attention is given to the genetic regulation of the differentiation process in an attempt to close gaps in our understanding of the dormancy phenomenon in cyanobacteria and to identify open questions for future research. © 2010 Springer-Verlag Berlin Heidelberg.

Shao Y.,Hainan University | Xie J.,Fresh Technology | Chen P.,Hainan University | Li W.,Fresh Technology | Li W.,Hainan University
Fruits | Year: 2013

Introduction. Rambutan (Nephelium lappaceum L.) is a kind of tropical fruit with high commercial value in international trade. However, harvested rambutan fruits suffer from a short shelf life and show rapid postharvest deterioration problems due to spintern browning and flesh decay. Materials and methods. Rambutan fruit (cv. 'Baoyan 5') were harvested in 2009 and 2010. Changes in some chemical components and the physiology of fruits were investigated at different storage temperatures (25 °C and 10 °C) and with different packing materials (regular low-density polyethylene and anti-moisture polyethylene bags). Results and discussion. Changes in the development of the browning index, and contents of total soluble solids, titratable acidity and vitamin C greatly decreased during low temperature storage (10 °C); moreover, low temperature storage (10 °C) could maintain a significantly higher level of superoxide dismutase activity and lower values of malondialdehyde and cell membrane permeability. The effects of packing material were different according to the different storage temperatures. At 10 °C, the beneficial effects of anti-moisture polyethylene bags on fruit quality and physiology were observed. However, at 25 °C, fruit packed with regular low-density polyethylene proved to be of better quality than those packed with anti-moisture polyethylene bags. Conclusion. The overall results suggest that packing with anti-moisture polyethylene bags and storage at 10 °C were the most suitable conditions to maintain quality and to extend the storage life of rambutan fruit. © 2012 Cirad/EDP Sciences.

Li T.,Dalian Nationalities University | Li T.,Southwest University | Jiang Y.,Fresh Technology | Jin G.,Fresh Technology | And 3 more authors.
Journal of Food Protection | Year: 2016

Two kinds of fish-derived natural antimicrobial substances, protamine and catfish (Clarias fuscus) epidermal mucus extract (CEME), were evaluated for their effect on the quality of grass carp fillets. Fillets were atmosphere packaged in cast polypropylene bags and were stored at 4"C in a low-temperature incubator without light. Solutions (0.5%, wt/vol) of CEME and protamine were used for dip pretreatment, respectively. Bacteriological (aerobic plate count, Shewanella putrefaciens, Pseudomonas fluorescens) and physicochemical (pH, total volatile basic nitrogen, K value, surface color, texture profiles, water distribution) parameters and volatile odor compounds were measured on days 0, 3, 6, 9, 12, and 15. The results indicated that CEME and protamine could improve all bacteriological and physicochemical indexes, except water distribution within muscle. In comparison, CEME had a more inhibitory effect, as determined by the aerobic plate count, and was more effective in inhibiting the growth of P. fluorescens; however, protamine was more effective in preventing the production of sulfur-organic (H2S) group substances. Protamine was more effective in inhibiting the growth of S. putrefaciens. This research suggests that protamine and CEME have the potential to improve the quality and extend the shelf life of grass carp fillets. Copyright ©, International Association for Food Protection.

Gao K.,Fresh Technology | Liu X.J.,Tianjin University of Science and Technology | Hao X.L.,Tianjin University of Science and Technology | Liu X.,Tianjin University of Science and Technology
Applied Mechanics and Materials | Year: 2014

In this paper,the clove essential oil was combined with β-Cyclodextrin and chitosan using the method of envelope binding,thus clove essential oil microencapsule antistaling agent was prepared.To detect the exterior characterization of microcapsule using SEM;To analyze the antimicrobial properties of microencapsules using the inhibition zone method, and the slow release rate of microencapsule was detected in 0, 2,30 ℃. The results showed that the microencapsule had irregular shapes and their surfaces were covered with many cracks;the inhibition zone diameter of Rhizopus sp. and Penicillium citrinum diameter were 1.2 cm and 1.6 cm partly; microencapsules showed a slow release state under the three temperature conditions,and it had the slowest release rate under 0 ℃ condition. © (2014) Trans Tech Publications, Switzerland.

Xue L.,Ningbo Institute of Materials Technology and Engineering | Liu B.,Ningbo Institute of Materials Technology and Engineering | Chen J.,Ningbo Institute of Materials Technology and Engineering | Shao A.,Fresh Technology
Advanced Materials Research | Year: 2012

As complement to air conditioners, ventilation systems are playing important roles in keeping human health as well as saving energy. They improved indoor air quality by replacing inside polluted air with outside fresh air. To reduce the energy needed to condition the induced fresh air, heat exchanging processes are designed to reduce the temperature differences between this fresh air and the indoor air. Heat exchanging processes using total heat exchange membranes (THEM) allowed not only the exchange of heat but also humidity, generally providing better energy saving and air quality improvement results. Recently, we have studied a novel class of THEM made from a casting process using inorganic and organic functional materials. Their structure and properties characterized with Scanning Electron Microscopy (SEM), BET Adsorption test, Water-vapor Permeability Analysis, CO2 Permeation Test, and Heat Exchange Efficiency Test are discussed here.

Li M.,Fresh Technology | Lv C.,Fresh Technology | Lu Y.,Fresh Technology | Jiao T.,Fresh Technology | And 2 more authors.
Journal of Chinese Institute of Food Science and Technology | Year: 2015

Red raspberry juice, blueberry and fresh milk were mainly used to develop a red raspberry and blueberry grain milk beverage. Response surface methodology (RSM) was employed to optimize the technological parameters of red raspberry and blueberry grain milk beverage. Texture analyzer was employed to determine the effect of curing blueberry grain by the solution of CaCl2. The results showed that the appropriate concentration of curing agent was 0.02 g/mL Ca-Cl2, the determination results of sensory score ws 82.83. Using the physical device on the texture profile analysis (TPA) of the blueberry, to get the hardness is 86.70 N, the flexibility is 0.67 mm, the cohesiveness is 0.57, the adhesive nature is 58.54, chewiness is 58.54 N. The results showed that the combination of 14% red raspberry juice, 2% blueberry grain, 35% fresh milk, 0.3% pectin, 40.7%water and 8% sucrose resulted in the best product quality with a sensory e-valuation score of 87.73. ©, 2015, Chinese Institute of Food Science and Technology. All right reserved.

Xu Y.,Fresh Technology | Zhang C.,Fresh Technology | Zhao H.,Fresh Technology | Liu Y.,Fresh Technology | And 3 more authors.
Journal of Chinese Institute of Food Science and Technology | Year: 2015

The effects of aliphatic aldehydes including heptanal, (E)-2-heptenal and (E,E)-2,4-decadienal on the volatile products of Maillard reaction were investigated by thermal reaction systems consisting of L-cysteine and D-xylose. The volatile compounds generated in different reaction mixtures were analyzed by solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry (GC-MS). The results showed that the volatile products of Maiilard reaction systems were mainly nitrogen-and sulfur-containing compounds, hydrocarbons, alcohols, ketones and esters. Most of nitrogen-and sulfur-containing compounds derived from the reaction between cysteine and xylose decreased due to the effects of aliphatic aldehydes, especially for 2-methyl-3-furanthiol and 2-furfurylthiol. And the content of these thiols reduced gradually with the increase of unsaturation degree of aliphatic aldehydes. Some thiophenes also decreased significantly, such as 3-methylthiophene and 2,5-thiophenedicarboxaldehyde. However, some new alkyl-thiophenes were formed in addition of aliphatic aldehyde to reaction system, including 2-pentyl-thiophene and 2-hexyl-thiophene. In addition, some new alcohols, ketones and esters were formed in aliphatic aldehyde-containing reaction system compared to the control. ©, 2015, Chinese Institute of Food Science and Technology. All right reserved.

Fresh Technology | Date: 2010-05-19

A liquid aeration system comprising: an intermittent liquid feeding means (10) located at an upstream position for receiving liquid from a liquid resource; a liquid storage means (20) located at an downstream position for receiving the liquid from the intermittent liquid feeding means (10) quantitatively and intermittently; and a pipe (30) connected between the intermittent liquid feeding means (10) and the liquid storage means (20), the outlet of which is located below the liquid surface of the liquid storage means (20), such that the liquid can flow from the intermittent liquid feeding means (10) through the pipe (30) into the liquid storage means (20) intermittently and quantitatively using the liquid level difference between the upstream position and the downstream position, so as to inject the air existed in the pipe (30) into the liquid in the liquid storage means (20).

Fresh Technology | Date: 2016-11-21

Water-saturated cap or membrane for hydrating cut plants and trees.

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