Stimulation of Light-Emitting Diode Treatment on Defence System and Changes in Mesocarp Metabolites of Avocados Cultivars (Hass and Fuerte) during Simulated Market Shelf Conditions

The ability of light-emitting diode (LED) light treatment to reduce the anthracnose decay via its eliciting effects and thus induce resistance in the avocado (Persea americana), was investigated in this study to replace the current postharvest fungicide treatment. In experiment 1, the effect of blue or red LED lights (6 h per day) on the incidence of anthracnose in artificially inoculated (Colletotrichum gloesposorioides) and naturally infected avocados (cv. Fuerte and Hass) at 12–14 °C (simulated market shelf) for 4, 8, 14, and 16 days was investigated. In experiment 2, the effect of blue or red LED lights on the induced defence mechanism, fruit metabolites, antioxidant activity, and percentage of fruit reaching ready-to-eat stage was determined. Exposure to red LED light significantly reduced the anthracnose decay incidence in naturally infected cv. Fuerte on day 12 and in cv. Hass on day 16 compared to the prochloraz fungicide treatment by upregulating the PAL genes and maintaining the epicatechin content. Blue LED light accelerated the ripening in both cultivars, probably due to reduced D-mannoheptulose content. Red LED light exposure for 6 h per day and 12 days storage showed potential to replace the prochloraz treatment with improved ascorbic acid content and antioxidant activity.

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Effect of 660 nm Light-Emitting Diode on the Wound Healing in Fibroblast-Like Cell Lines

International Journal of Photoenergy ◽

10.1155/2015/916838 ◽

2015 ◽

Vol 2015 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Myung-Sun Kim ◽

Yong-Ick Cho ◽

Min-Suk Kook ◽

Sang-Chul Jung ◽

Young-Hyun Hwang ◽

...

Keyword(s):

Cell Proliferation ◽

Wound Healing ◽

Near Infrared ◽

Light Emitting Diode ◽

Biological Effects ◽

Soft Tissue Injuries ◽

Light Emitting ◽

Led Light ◽

Red Led ◽

And Migration

Light in the red to near-infrared (NIR) range (630–1000 nm), which is generated using low energy laser or light-emitting diode (LED) arrays, was reported to have a range of beneficial biological effects in many injury models. NIR via a LED is a well-accepted therapeutic tool for the treatment of infected, ischemic, and hypoxic wounds as well as other soft tissue injuries in humans and animals. This study examined the effects of exposure to 660 nm red LED light at intensities of 2.5, 5.5, and 8.5 mW/cm2for 5, 10, and 20 min on wound healing and proliferation in fibroblast-like cells, such as L929 mouse fibroblasts and human gingival fibroblasts (HGF-1). A photo illumination-cell culture system was designed to evaluate the cell proliferation and wound healing of fibroblast-like cells exposed to 600 nm LED light. The cell proliferation was evaluated by MTT assay, and a scratched wound assay was performed to assess the rate of migrating cells and the healing effect. Exposure to the 660 nm red LED resulted in an increase in cell proliferation and migration compared to the control, indicating its potential use as a phototherapeutic agent.

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Phototactic Response of the Oriental Armyworm, Mythimna separata (Lepidoptera: Noctuidae), to Light-Emitting Diode Lights of Different Wavelengths

10.20944/preprints201905.0014.v1 ◽

2019 ◽

Author(s):

Kil-Nam Kim ◽

Hye-Sung Song ◽

Ryong-Jin Choe ◽

Zhi-Juan Huang ◽

Qiu-Ying Huang ◽

...

Keyword(s):

Light Emitting Diode ◽

Insect Pest ◽

Light Trap ◽

Mythimna Separata ◽

Light Emitting ◽

Led Light ◽

Phototactic Response ◽

Green Led ◽

Oriental Armyworm ◽

Led Lights

Recently, light traps using light-emitting diode (LED) lights have been applied to monitor or control insect pests. The oriental armyworm, Mythimna separata Walker, is an important insect pest that has caused damage to several cereal crops, including corn, wheat and rice. The present study aims to seek out a sensitive wavelength causing high phototactic response in M. separata. The study evaluated the phototactic responses of M. separata moths to several LED lights of different wavelengths and luminance intensities under laboratory condition. Results showed that green (520 nm) LED light resulted in significant phototactic response of M. separata moths compared to LED lights of other wavelengths. Additionally, the highest attraction rate of the moths to green LED light appeared in luminance intensity group of 200 lux compared to the other intensities groups. Experiments under optimum conditions based on the above experiments revealed that the green LED light exhibited the strongest attraction rate (64.44%) among all experimental groups. An experiment performed in a net cage also showed that green LED light resulted in the highest phototactic response of M. separata moths, 1.7 times more than a commercial black light used as control. These findings clearly demonstrate that M. separata moths have a high sensitivity to the green LED light. Therefore, a light trap equipped with green LED light could be useful for monitoring and controlling M. separata moths.

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The Effects of Eggplants Illuminated by Red LED (Light Emitting Diode) on the Population Density of the Melon Thrips, Thrips palmi (Thysanoptera: Thripidae)

Japanese Journal of Applied Entomology and Zoology ◽

10.1303/jjaez.2015.7 ◽

2015 ◽

Vol 59 (1) ◽

pp. 7-9 ◽

Cited By ~ 2

Author(s):

Manabu Shibao ◽

Hiroshi Tanaka

Keyword(s):

Population Density ◽

Light Emitting Diode ◽

Light Emitting ◽

Led Light ◽

Red Led ◽

Melon Thrips

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PHOTOTHERAPY FOR MILD TO MODERATE ACNE VULGARIS WITH PORTABLE BLUE AND RED LED

Journal of Innovative Optical Health Sciences ◽

10.1142/s1793545811001241 ◽

2011 ◽

Vol 04 (01) ◽

pp. 45-52 ◽

Cited By ~ 4

Author(s):

GUANGDA LIU ◽

CHANGE PAN ◽

KAI LI ◽

YUAN TAN ◽

XUNBIN WEI

Keyword(s):

Side Effects ◽

Light Emitting Diode ◽

Acne Vulgaris ◽

Red Light ◽

Light Sources ◽

Light Emitting ◽

Led Light ◽

Led Phototherapy ◽

Red Led ◽

Complete Treatment

In this paper, we studied portable blue and red light-emitting-diode (LED) light sources in phototherapy for mild to moderate acne vulgaris to evaluate the efficacy and tolerance of patients. Patients, randomly divided into blue and red groups, received either blue or red LED phototherapy twice a week for four weeks. After complete treatment, the number of lesions reduced by 71.4% in the blue group, in contrast to 19.5% in the red group. No obvious side effects were observed during and one month after the treatment, except for some mild dryness mentioned by several patients.

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Polymerization quality testing of composite resins cured by led light source

Stomatoloski glasnik Srbije ◽

10.2298/sgs0301007b ◽

2003 ◽

Vol 50 (1) ◽

pp. 7-12 ◽

Cited By ~ 3

Author(s):

Larisa Blazic ◽

Slavoljub Zivkovic ◽

Dejan Pantelic ◽

Vladimir Pipic

Keyword(s):

Light Source ◽

Light Exposure ◽

Light Emitting Diode ◽

Composite Resins ◽

Curing Time ◽

Light Emitting ◽

Led Light ◽

Depth Of Cure ◽

Dental Tissues ◽

Hard Dental Tissues

The quality of interface between composite resin materials and hard dental tissues is highly dependent on the polymerization light source. Newly developed blue light- emitting diode units for light polymerization of dental restorative materials are the most innovative light source technology in dentistry nowadays. The aim of this work was to estimate the depth of cure of five different light-activating composite resins exposed to different irradiation times (5s, 10s, 20s and 40s) when the experimental LED light source was used. The tested materials were: Tetric Ceram (Vivadent), Point 4 (Kerr), Admira (VOCO), Filtek Z250 (3M) and Diamond Lite (DRM Lab., Inc). The depth of cure testing was determined using a penetrometer. Results after 40s curing time were as following: the deepest depth of cure was achieved after application of Filtek Z 250, Diamond Lite Point 4 and Tetric Ceram. For the restorative material Admira was found the lowest depth of cure for the light exposure of 40s. An experimental LED light source achieved a sufficient depth of cure (over 2 mm) for all tested materials after curing time of 10s. The polymerization light source spectral distribution should be considered in addition to irradiance as a depth of cure indicator.

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‘To LED or Not to LED?’: Using Color Priming for Influencing Consumers’ Preferences of Light Bulbs

Sustainability ◽

10.3390/su13031401 ◽

2021 ◽

Vol 13 (3) ◽

pp. 1401

Author(s):

Iris Gavish ◽

Abraham Haim ◽

Doron Kliger

Keyword(s):

Blue Light ◽

Light Emitting Diode ◽

Purchasing Decisions ◽

Light Bulb ◽

Traffic Light ◽

Light Emitting ◽

Led Light ◽

Red Led ◽

Color Priming ◽

New Research

Recently, we have seen energy-efficient light-emitting diode (LED) light bulbs rapidly replace incandescent ones. However, results of new research are indicative of adverse health impacts of LED lighting, which is characterized by enriched blue light. Our study aims to reveal whether using color priming by attaching red/green traffic-light icons on light bulbs influences consumers’ preferences of light bulbs. We conducted a field study simulating the buying process, in which participants (N = 572) were presented with LED and carbon incandescent bulbs. We alternately displayed two pairs of bulbs: (1) in their original packaging and (2) in packages marked with traffic light icons (red = LED). Our results confirm that traffic light icons significantly (p < 0.01) increase the odds of choosing the healthier carbon bulb. The results highlight the benefits of attaching traffic light icons to light bulb packaging, helping consumers to make more health-conscientious purchasing decisions. Nowadays, this study’s contribution is more significant due to COVID-19 restrictions and stay-at-home policies, since people work or study remotely, which increases their exposure to household lighting. These results may incentivize policymakers to enforce adding traffic light icons to light bulb packaging, thus encouraging LED light bulb manufacturers to reduce the blue light component in order to improve the health aspect of their bulbs.

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Pengaruh warna lampu light emitting diode dalam air terhadap hasil tangkapan ikan Teri (Stolephorus commersonii) dengan bagan

JURNAL ILMU DAN TEKNOLOGI PERIKANAN TANGKAP ◽

10.35800/jitpt.4.2.2019.24225 ◽

2019 ◽

Vol 4 (2) ◽

pp. 45

Author(s):

Christianti Triagneriauly Amos ◽

Revols Dolfi Chistian Pamikiran ◽

Patrice Nelson Isaak Kalangi ◽

Henry James Kumajas

Keyword(s):

Light Emitting Diode ◽

Block Design ◽

Green Water ◽

Fishing Gear ◽

Light Emitting ◽

Led Light ◽

Randomized Block Design ◽

Significant Difference ◽

Different Color ◽

Led Lights

Lift nets is one of the fishing gear which operate at the night. This fishing gear are using light as a aids to attract fish into the fishing area. Research on the use of LED lights in water on lift nets is carried out in Tateli Weru Waters, with the aim to see how the effect of using different color underwater LED lights on anchovy catches (Stolephorus commersonii), and knowing the amount of anchovy (Stolephorus commersonii) catch on lift net using the experimental method, where data is analyzed using Completely Randomized Block Design (RCBD), and continued by Least Significant Difference test (LSD). Trial of anchovy fishing (Stolephorus commersonii) was conducted in December 2018 for 10 days by operating boat lift nets using green, blue and green-blue LED lights. The results showed that the use of LED light colors in blue water had a very significant effect on the amount of anchovy catch (Stolephorus comersonii) compared to to the color of LED lights in green-blue and green water. Whereas the use of LED light colors in blue-green water with green is not statistically significantly different from the amount of anchovy caught (Stolephorus comersonii).ABSTRAKBagan merupakan salah satu alat penangkapan ikan yang dioperasikan pada malam hari. Alat tangkap ini menggunakan cahaya lampu sebagai alat bantu untuk menarik ikan masuk ke dalam area penangkapan. Penelitian mengenai penggunaan lampu LED dalam air pada bagan dilakukan di Perairan Tateli Weru, dengan tujuan untuk melihat bagaimana pengaruh penggunaan lampu LED bawah air dengan warna yang berbeda terhadap hasil tangkapan ikan teri (Stolephorus commersonii), serta mengetahui jumlah hasil tangkapan ikan teri (Stolephorus commersonii) pada bagan dengan menggunakan metode eksperimental, dimana data dianalisis dengan menggunakan Rancangan Acak Kelompok (RAK) dan dilanjutkan dengan uji Beda Nyata Terkecil (BNT). Uji coba penangkapan ikan teri (Stolephorus commersonii) dilakukan pada bulan Desember 2018 selama 10 hari dengan mengoperasikan bagan apung menggunakan lampu LED hijau, biru dan hijau-biru. Hasil penelitian menunjukkan bahwa penggunaan warna lampu LED dalam air biru memberikan pengaruh yang sangat nyata terhadap jumlah hasil tangkapan ikan teri (Stolephorus comersonii) dibandingkan warna lampu LED dalam air hijau-biru dan hijau. Sedangkan antara penggunaan warna lampu LED dalam air hijau-biru dengan hijau secara statistik tidak berbeda nyata terhadap jumlah hasil tangkapan ikan teri (Stolephorus comersonii).

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LED-Induced Microglial Activation and Rise in Caspase3 Suggest a Reorganization in the Retina

International Journal of Molecular Sciences ◽

10.3390/ijms221910418 ◽

2021 ◽

Vol 22 (19) ◽

pp. 10418

Author(s):

Boglárka Balogh ◽

Gergely Szarka ◽

Ádám J. Tengölics ◽

Gyula Hoffmann ◽

Béla Völgyi ◽

...

Keyword(s):

Microglial Activation ◽

Caspase 3 ◽

Light Exposure ◽

Light Emitting Diode ◽

Neuronal Cell Death ◽

Neuronal Cell ◽

Mrna Levels ◽

Light Emitting ◽

Led Light ◽

Retinal Tissue

Vision is our primary sense as the human eye is the gateway for more than 65% of information reaching the human brain. Today’s increased exposure to different wavelengths and intensities of light from light emitting diode (LED) sources could induce retinal degeneration and accompanying neuronal cell death. Damage induced by chronic phototoxic reactions occurring in the retina accumulates over years and it has been suggested as being responsible for the etiology of many debilitating ocular conditions. In this work, we examined how LED stimulation affects vision by monitoring changes in the expression of death and survival factors as well as microglial activation in LED-induced damage (LID) of the retinal tissue. We found an LED-exposure-induced increase in the mRNA levels of major apoptosis-related markers BAX, Bcl-2, and Caspase-3 and accompanying widespread microglial and Caspase-3 activation. Everyday LED light exposure was accounted for in all the described changes in the retinal tissue of mice in this study, indicating that overuse of non-filtered direct LED light can have detrimental effects on the human retina as well.

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LIGHT EMITTING DIODE (LED) HIJAU DAN PENGARUHNYA TERHADAP PENGURANGAN BYCATCH PENYU PADA PERIKANAN GILLNET DI PERAIRAN PALOH (Green Light Emitting Diode (LED) and its Effect on Sea Turtle Bycatch Reduction of Gillnet Fisheries in Paloh Waters)

Marine Fisheries Journal of Marine Fisheries Technology and Management ◽

10.29244/jmf.8.1.87-99 ◽

2017 ◽

Vol 8 (1) ◽

pp. 87

Author(s):

Ganang Dwi Prasetyo ◽

Ronny Irawan Wahju ◽

Roza Yusfiandayani ◽

Mochammad Riyanto

Keyword(s):

Light Emitting Diode ◽

Green Light ◽

Chelonia Mydas ◽

Sea Turtle ◽

Innovative Technology ◽

Light Emitting ◽

Led Light ◽

Green Led ◽

Marine Megafauna ◽

Led Lights

<div class="WordSection1">ABSTRACTBycatch problem is a global issue and can be a driver of marine megafauna declines in the world, such as sea turtle, where is the animal's status as endangered species. Green Light Emitting Diode (LED) is known as an innovative technology to reduce sea turtle bycatch without reduce target catch effectively. The use of green LED in order to reduce sea turtle bycatch in gillnet fisheries was carried out in Paloh Coast, West Borneo during August to October 2015. Experiment performed a total of 20 settings with gillnet fleets operate two units simultaneously, ie gillnet control (without LED lights) and gillnet experiment (with LED lights). Turtles caught predominantly were in the juvenile phase as 57.14% and the potential location of capture sea turtle bycatch in station 2 (1˚52' - 1˚56' LU and 109˚14' - 109˚18' BT). The results, showed that the green turtle (Chelonia mydas) were caught of 7 turtles, were captured by control gillnet 6 turtles with an CPUE 0.29 ± 0.03 Turtle/E, while by experimental gillnet 1 turtle with an CPUE by 0,04 ± 0,009 Turtle/E. The used of green LED light was significantly reduce sea turtle bycatch of 85% without decreasing target catch.Keywords: CPUE, green LED light, sea turtle bycatchABSTRAKPermasalahan terkait bycatch merupakan isu utama global yang dapat mengancam penurunan populasi megafauna laut seperti penyu yang telah berstatus endangerd species. Lampu LED merupakan inovasi teknologi untuk mengurangi bycatch penyu tanpa mengurangi hasil tangkapan ikan utama secara efektif. Penggunaan lampu Light Emmitting Diode (LED) hijau untuk mengurangi bycatch penyu pada perikanan jaring insang (gillnet) dilakukan di perairan Paloh, Kalimantan Barat selama bulan Agustus hingga Oktober 2015. Uji coba dilakukan dengan menggunakan 2 unit kapal gillnet yang dioperasikan di setiap stasiun pengamatan secara bersamaan dengan jumlah ulangan sebanyak 20 kali, diantaranya gillnet kontrol (tanpa lampu LED) dan gillnet eksperimen (dengan lampu LED). Penyu yang tertangkap cenderung didominasi oleh fase juvenile sebesar 57,14% dan lokasi potensi tertangkapnya bycatch penyu pada stasiun 2 (1˚52' - 1˚56' LU dan 109˚14' - 109˚18' BT). Hasil penelitian menunjukkan bahwa penyu yang tertangkap merupakan penyu hijau (Chelonia mydas) berjumlah 7 ekor, terdiri dari 6 ekor tertangkap pada gillnet kontrol dengan CPUE 0,29 ± 0,03 ekor/E, dan 1 ekor pada gillnet eksperimen dengan CPUE 0,04 ± 0,009 ekor/E. Penggunaan lampu LED hijau memberikan pengaruh secara significant untuk mengurangi bycatch penyu dengan persentase pengurangan sebesar 85% tanpa mengurangi hasil tangkapan ikan utama.Kata kunci: CPUE, lampu LED hijau, bycatch penyu</div>

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Growth and Appearance Quality of Four Microgreen Species under Light-emitting Diode Lights with Different Spectral Combinations

HortScience ◽

10.21273/hortsci14925-20 ◽

2020 ◽

Vol 55 (9) ◽

pp. 1399-1405

Author(s):

Qinglu Ying ◽

Yun Kong ◽

Youbin Zheng

Keyword(s):

Plant Height ◽

High Intensity ◽

Light Emitting Diode ◽

Red Light ◽

Photon Flux ◽

Photon Flux Density ◽

Light Emitting ◽

Led Light ◽

Red Led ◽

Dry Biomass

To investigate plant growth and quality responses to different light spectral combinations, cabbage (Brassica oleracea L. var. capitata f. rubra), kale (Brassica napus L. ‘Red Russian’), arugula (Eruca sativa L.), and mustard (Brassica juncea L. ‘Ruby steak’) microgreens were grown in a controlled environment using sole-source light with six different spectra: 1) FL: cool white fluorescent light; 2) BR: 15% blue and 85% red light-emitting diode (LED); 3) BRFRL: 15% blue, 85% red, and 15.5 µmol·m−2·s−1 far-red (FR) LED; 4) BRFRH: 15% blue, 85% red, and 155 µmol·m−2·s−1 FR LED; 5) BGLR: 9% blue, 6% green, and 85% red LED; and 6) BGHR: 5% blue, 10% green, and 85% red LED. For all the light treatments, the total photosynthetic photon flux density (PPFD) was set at ≈330 µmol·m−2·s−1 under a 17-hour photoperiod, and the air temperature was ≈21 °C with 73% relative humidity (RH). At harvest, BR vs. FL increased plant height for all the tested species except arugula, and enlarged cotyledon area for kale and arugula. Adding high-intensity FR light to blue and red light (i.e., BRFRH) further increased plant height for all species, and cotyledon area for mustard, but it did not affect the fresh or dry biomass for any species. Also, BRFRH vs. BR increased cotyledon greenness for green-leafed species (i.e., arugula, cabbage, and kale), and reduced cotyledon redness for red-leafed mustard. However, BGLR, BGHR, and BRFRL, compared with BR, did not affect plant height, cotyledon area, or fresh or dry biomass. These results suggest that the combination of 15% blue and 85% red LED light can potentially replace FL as the sole light source for indoor production of the tested microgreen species. Combining high-intensity FR light, rather than low-level (≤10%) green light, with blue and red light could be taken into consideration for the optimization of LED light spectral quality in microgreen production under environmental conditions similar to this experiment.

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