scholarly journals Availabilities of Red Light-Emitting Diodes as Light Source for Low Light Irradiation and Mineral Nutrient Supply Using Nutrient Gel during Low Temperature Storage of Postharvest Chervil (Anthriscus cerefolium L.).

1999 ◽  
Vol 37 (2) ◽  
pp. 137-141 ◽  
Author(s):  
Kazuhiro FUJIWARA ◽  
Koichi TAKAKU ◽  
Mitsuo IIMOTO
Keyword(s):  
Low Temperature ◽  
Light Source ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Nutrient Supply ◽  
Mineral Nutrient ◽  
Low Light ◽  
Light Emitting ◽  
Low Temperature Storage ◽  
Temperature Storage

Low-temperature Storage of Micropropagated Broccoli Plantlets under Varying Light Quality

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 543b-543
Author(s):  
Sandra B. Wilson ◽  
Nihal C. Rajapakse ◽  
Roy E. Young
Keyword(s):  
Low Temperature ◽  
Blue Light ◽  
Carbon Balance ◽  
Red Light ◽  
Dry Mass ◽  
Dry Matter Accumulation ◽  
Labor Costs ◽  
Low Temperature Storage ◽  
Zero Carbon ◽  
Temperature Storage

Micropropagation is often associated with mass production at a competitive price. Since labor accounts for a large portion of micropropagation costs, alternative measures to distribute labor costs are necessary. One such method of distributing labor costs is the use of storage systems to hold micropropagated plantlets until market availability. Broccoli (Brassica oleracea L. `Green Duke') plantlets were cultured photoautotrophically (without sugar) or photomixotrophically (with sugar) on cellulose plugs in liquid media in vitro for 3 weeks at 23 °C and 150 μmol·m–2·s–1 photosynthetic photon flux (PPF). To determine the conditions that yield a zero carbon balance, plantlets were subsequently stored for 3 d under different temperatures (1, 5, 10, 15 °C), different light intensities (1.6, 4.1, 8.6 PPF), and different light spectra (provided by white or blue fluorescent bulbs or red Light Emitting Diodes). Plantlets under 3 PPF and 1 °C maintained a zero carbon balance. Subsequently, plantlets were stored for 4, 8, or 12 weeks at 1 °C under darkness or 3 PPF of white, red, or blue light. Prior to low temperature storage, photomixotrophic plantlets were characterized by increased chlorophyll, dry mass, total soluble sugars (TSS), leaf starch, and net photosynthetic rate (NPR). Illumination during storage was necessary to maintain dry mass, TSS, NPR, and regrowth potential of photoautotrophic plantlets. When sucrose was provided to the media, dark stored plantlets survived up to 12 weeks of storage. During storage, the quality of broccoli plantlets was best maintained under red light. Red light increased chlorophyll, TSS, and dry matter accumulation into leaves during storage. In addition, photoautotrophic plantlets stored for 8 or 12 weeks under red light had higher survival rates once acclimatized to the greenhouse when compared to photoautotrophic plantlets stored in darkness or under white or blue light.

scholarly journals Treatment of food waste digestate using microalgae-based systems with low-intensity light-emitting diodes

2018 ◽  
Vol 78 (1) ◽  
pp. 225-234 ◽  
Author(s):  
Andrés Felipe Torres Franco ◽  
Scarlet da Encarnação Araújo ◽  
Fabiana Passos ◽  
Carlos Augusto de Lemos Chernicharo ◽  
César Rossas Mota Filho ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Food Waste ◽  
Light Emitting Diodes ◽  
Red Light ◽  
Oxygen Demand ◽  
Full Scale ◽  
Low Light ◽  
Light Emitting ◽  
Low Intensity ◽  
Soluble Chemical Oxygen Demand

Abstract Anaerobic digestion of food wastes coupled with digestate post-treatment using microalgae-based systems could recover large amounts of energy and nutrients worldwide. However, the development of full-scale implementations requires overcoming microalgae inhibition by high ammonia concentrations and low light transmittances affecting photosynthesis. This study evaluated the potential of microalgae-based reactors supplied with red light-emitting diodes (LEDs) at low intensity (660 nm and 15 µmol·m−2·s−1) to treat food waste digestate. LED reactors were compared with control reactors exposed to solar radiation. From a range of species in the inoculum, Chlorella vulgaris showed high adaptation to both lighting regimes and digestate environmental conditions, characterized by a C:N:P ratio of 74:74:1. Removal efficiencies for control and LED reactors were 84.0% and 95.8% for soluble chemical oxygen demand (COD) and 89.4% and 53.0% for ammonia, respectively. Approximately 50% of ammonia in control reactor and 15% in LED reactor was lost from the systems, whereas 17% and 36% of ammonia was transformed to organic nitrogen in control and LED reactors, respectively. Low-intensity LEDs maintained microalgae growth in levels similar to solar radiation and supported efficient digestate treatment, showing a potential for further application in optimization of full scale reactors at a relatively low energy cost.

USS 9% NICKEL STEEL

Alloy Digest ◽  
1964 ◽  
Vol 13 (8) ◽  
Keyword(s):  
United States ◽  
Fracture Toughness ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Steel ◽  
Low Temperature Storage ◽  
United States Steel Corporation ◽  
Steel Corporation ◽  
Temperature Storage

Abstract USS 9% Nickel Steel was specifically developed for low-temperature storage vessels operating down to minus 320 F. It is recommended for cryogenic service. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. Filing Code: SA-166. Producer or source: United States Steel Corporation.

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