scholarly journals An improved foolproof device for eggs’ sterilization of Corcyra cephalonica (Stainton)

2017 ◽  
Vol 9 (3) ◽  
pp. 1302-1304
Author(s):  
Surender Kumar Singh ◽  
P. Kumar
Keyword(s):  
Uv Light ◽  
Ultra Violet ◽  
Mass Rearing ◽  
Corcyra Cephalonica ◽  
Whole Body ◽  
Uniform Distance ◽  
Lepidoptera Pyralidae ◽  
Laboratory Workers ◽  
Host Embryo ◽  
Uv Rays

Mass rearing of numerous biological control agents depends on large amounts of eggs of factitious hosts like rice meal moth, Corcyra cephalonica (Stainton) (Lepidoptera : Pyralidae). Corcyra eggs sterilization is required before they are used for parasitisation by Trichogrammatids. To meet the requirement of eggs sterilization of this insect, a new innovative device was invented, fabricated and studied. It consisted of an enclosed structure having semi-circular shaped drawer. An ultra violet (UV) tube of 30 W is fixed on the centre of its ceiling to maintain a uniform distance of 35 cm from the eggs to be sterilized. An exposure of 10 minutes to eggs of C. cephalonica was required to get optimum sterilization. As whole body of the device was an enclosed structure, hence, there was no exposure of UV rays to the laboratory workers. The different sized-models (150,100, 50 of “egg cards” required for Trichogrammatids) can be fabricated to meet the diverse requirements. Irradiated eggs were found having no any adverse effects on the abilities of Trichogrammatids parasitisation and its emergence. It can also used for UV sterilization of laboratory materials like glassware, plastic ware, clothes, cotton etc. The period of exposure to the UV light was set using timer. This innovative UV chamber had numerous advantages i.e., the UV rays used had damaged the host embryo. The damaged embryo could not develop into next stage, at the same time damaged embryo found suitable for parasitization of Trichogrammatids. The whole body of the device was made-up of an enclosed struc-ture; hence, there was no exposure of UV rays to the laboratory workers. The different sized-models (150,100, 50 of “egg cards” required for Trichogrammatids) can be fabricated to meet the diverse requirements of clients. As the UV chamber was made up of metal and ply boards, hence, it was durable. The longitudinal flanges provided in the drawer of the device prevented the host egg bearing cards to glide one over other from curved surface. The device was found safe and effective for sterilization of Corcyra eggs and easy to operate.

scholarly journals Effect of Pre-Harvest Supplemental UV-A/Blue and Red/Blue LED Lighting on Lettuce Growth and Nutritional Quality

Horticulturae ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 80
Author(s):  
Triston Hooks ◽  
Joseph Masabni ◽  
Ling Sun ◽  
Genhua Niu
Keyword(s):  
Blue Light ◽  
Nutritional Quality ◽  
Uv Light ◽  
Ultra Violet ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Daily Light Integral ◽  
Lettuce Growth ◽  
Supplemental Lighting

Blue light and ultra-violet (UV) light have been shown to influence plant growth, morphology, and quality. In this study, we investigated the effects of pre-harvest supplemental lighting using UV-A and blue (UV-A/Blue) light and red and blue (RB) light on growth and nutritional quality of lettuce grown hydroponically in two greenhouse experiments. The RB spectrum was applied pre-harvest for two days or nights, while the UV-A/Blue spectrum was applied pre-harvest for two or four days or nights. All pre-harvest supplemental lighting treatments had a same duration of 12 h with a photon flux density (PFD) of 171 μmol m−2 s−1. Results of both experiments showed that pre-harvest supplemental lighting using UV A/Blue or RB light can increase the growth and nutritional quality of lettuce grown hydroponically. The enhancement of lettuce growth and nutritional quality by the pre-harvest supplemental lighting was more effective under low daily light integral (DLI) compared to a high DLI and tended to be more effective when applied during the night, regardless of spectrum.

Study on the Visual Response of Frankliniella occidentalis to Ultra Violet-Visible Spectroscopy with Different Wavelength Ranges

2021 ◽  
Vol 15 (4) ◽  
pp. 497-503
Author(s):  
Qihang Liu ◽  
Yueli Jiang ◽  
Mingqian Zhao ◽  
Jin Miao ◽  
Zhongjun Gong ◽  
...  
Keyword(s):  
White Light ◽  
Frankliniella Occidentalis ◽  
Uv Light ◽  
Ultra Violet ◽  
Western Flower Thrips ◽  
Selection Response ◽  
Visual Sensitivity ◽  
Light Energy ◽  
Visual Response ◽  
Response Effect

To understand the visual sensitivity of western flower thrips to 350–450 nm light, we examined thrips selective response effect and the effect of white light on thrips visual response effect. The results showed that the visual selection response to Ultra Violet (UV) light at 360–365 nm, the approach sensitivity to 380–385 nm light with 6000 lx was respectively the best (15.59, 7.26%), while under light energy, both of them to 360–365 nm light with 60 mW/cm2 were the best (20.04, 11.13%). Under contrast white light, the most sensitive UV spectra of thrips respectively caused by illumination, light energy was 380–385, 360–365 nm, and white light enhanced thrips visual response effect to UV light, which further increased by the increasing intensity, showing that under illumination, the visual response effect to 380–385 nm light with 6000 lx was the best (51.21,69.78%), while that to 360–365 nm light with 60 mW/cm2 were the best (43.98, 65.68%), originated from the different intensity spread by light energy and illumination. These results indicate that the change of photo-stimulus intensity property can regulated thrips visual sensitivity to enhance the phototactic effect.

Observations of TiO2 Surfaces Using Totally Reflected X-ray In-plane Diffraction Under UV Irradiation

2002 ◽  
Vol 751 ◽  
Author(s):  
T. Horiuchi ◽  
H. Ochi ◽  
K. Kaisei ◽  
K. Ishida ◽  
K. Matsushige
Keyword(s):  
Uv Irradiation ◽  
Uv Light ◽  
Plane Surface ◽  
Signal To Noise Ratio ◽  
High Surface ◽  
Ultra Violet ◽  
High Signal ◽  
X Ray ◽  
Force Microscopy ◽  
Catalytic Activities

ABSTRACTSurface lattice displacements of titanium dioxide (TiO2: rutile) during ultra-violet (UV) light irradiation have been investigated using a total reflection x-ray diffraction, which provides a high signal to noise ratio (S/N) and superior in-plane surface diffraction. Under the environments in vapors of H2O, CH3OH, C2H5OH and C3H6OH, the photo-catalytic activities of TiO2 (110), (100) and (001) surfaces subject to UV irradiation have been measured. It is found that the diffraction peaks and their full width half maxima (FWHMs) show some peculiarities with respect to the photo-catalytic activities in both surface lattices and adsorbed molecules in vapors. Furthermore, Kelvin force microscopy (KFM) has showed that there exists a very high surface potential, probably due to surface atom displacements induced by UV irradiation. With regard to the origin of the photo-catalytic activities, the induced surface potentials are discussed.

scholarly journals DAYA PATOGENESITAS Helicoverpa armigera Nuclear Polyhedrosis Virus HaNPV SETELAH TERKENA RADIASI SINAR ULTRAVIOLET

2000 ◽  
Vol 6 (1) ◽  
pp. 65-70
Author(s):  
Mahanani Tri Asri ◽  
Isnawati Isnawati
Keyword(s):  
Biological Control ◽  
Helicoverpa Armigera ◽  
Nuclear Polyhedrosis Virus ◽  
Uv Light ◽  
Ultra Violet ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Helicoverpa Armígera ◽  
Polyhedrosis Virus ◽  
Nuclear Polyhedrosis

This research is about pathogen capacity of the Helicoverpa armigera nuclear Polyhedrosis Virus (HaNPV) after irradiation by ultra violet (UV) light. The HaNPV is the one kind of the virus which attack the insect Helicoverpa armigera-attacker the some species of the crop life tobacco, cotton, potato, tomato. Because of that the HaNPV can be used as the biological control of the pest. Some researcher stated that the pathogen capacity of the HaNPV is decrease if the virus was expose in the ultra violet (UV) light. Because of the fact the virus in not useful as the biological control of the pest in the land corp. This research to test the statement. Laboratory experimental was done to tested the pathogen capacity of the HaNPV after irradiation treatment by the ultra violet light. The intensity of the UV light in this experiment were 28.7 lux, 97.3 lux, and 127.4 lux with the lighting period were 0, 1, 3, 6, 9, 12, and 15. The result of the research stated that the pathogen capacity of the HaNPV was not influenced by ultra violet light. So the virus is still useful as the biological control of the pest in the land crop.

Morphologic, Photocatalytic and Antibacterial Properties of ZnO-TiO2 Sol-Gel System

2018 ◽  
Vol 762 ◽  
pp. 278-282
Author(s):  
Anzelms Zukuls ◽  
Gundars Mežinskis ◽  
Aigars Reinis ◽  
Ingus Skadins ◽  
Juta Kroica ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Ultra Violet ◽  
Properties Of Coatings ◽  
Force Microscopy ◽  
Glass Slides ◽  
Heat Treated ◽  
Colour Changes

Prepared and heat-treated sol-gel ZnO-TiO2 coatings onto microscope glass slides were characterised by atomic force microscopy (AFM), scanning electron microscopy (SEM), as well as absorption spectra of light has been obtained. Thermally treated xerogels were characterised by X-ray diffraction (XRD). As well as their photocatalytic activity using methyl orange (MO) and observing the colour changes over the time in visible light (VIS) and ultra violet (UV) light has been determined. The influence of ZnO concentration on morphology, photocatalytic activity and antibacterial properties of coatings was analysed. The growth of S. epidermidis on the surface of the samples was inhibited due to photocatalytic properties of coatings.

Photo-Electron Emission Microscopy of Semiconductor Surfaces

1998 ◽  
Vol 4 (S2) ◽  
pp. 606-607
Author(s):  
R.J. Nemanich ◽  
S.L. English ◽  
J.D. Hartman ◽  
W. Yang ◽  
H. Ade ◽  
...  
Keyword(s):  
Electron Emission ◽  
Imaging System ◽  
Uv Light ◽  
Ultra Violet ◽  
Objective Lens ◽  
Electron Optics ◽  
Light Sources ◽  
Emission Microscopy ◽  
Electron Imaging ◽  
Crucial Part

The technique of photo-electron emission microscopy (PEEM) is based on imaging of photo excited electrons from a surface. Typically ultra violet (UV) light above the work function of a metal will cause electrons to be emitted from a surface. Since photo excited electrons originate very near to the surface, they essentially reflect the electronic structure of the surface. These electrons may be accelerated and imaged, and the image will reflect the properties of the surface.While the PEEM technique has been understood in a basic sense for many years, it has been limited by the lack of high intensity UV light sources. The most crucial part of the electron imaging system for PEEM, the objective lens, is essentially the same as for the sister technique of low energy electron microscopy (LEEM), and advances in electron optics capabilities have been exploited both for LEEM and for PEEM.

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