A Study of Oxygenation Techniques and the Chlorophyll Responses of Pelargonium tomentosum Grown in Deep Water Culture Hydroponics

Pelargonium tomentosum Jacq.; the peppermint-scented pelargonium, is an herbaceous groundcover indigenous to the Western Cape of South Africa. Volatile oils are produced by this plant, which are used in the fragrance industry. Studies on other Pelargonium species have shown chlorophyll content may affect the yield of essential oils. This study was carried out to investigate the viability of growing P. tomentosum in deep water culture (DWC) hydroponics and how best to aerate/oxygenate the nutrient solution to increase the chlorophyll content within leaves. The experiment was conducted over a period of 74 days, 16 different methods of oxygenation were applied to 9 replicates. The control had passive aeration; the treatments were made up of air-pumps, vortex oxygenators, and the application of hydrogen peroxide at various frequency intervals; these were combined with each other and run as separate oxygenation methods. The measurement of the chlorophyll content of plant leaves has been established to be an accurate way of establishing vigor, health, and levels of stress. It was found that the combination of high-frequency application (every third day) of hydrogen peroxide, vortex oxygenation, and air-pump injection (both operational for 24 hours/day) which formed treatment 11 (APVHa), yielded the highest production of chlorophyll within all the replicates differing significantly (P ≤ 0.001) from the control and other treatments.

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Colpitts-type oscillator for high frequency application

Proceedings of the 2004 IEEE International Frequency Control Symposium and Exposition, 2004. ◽

10.1109/freq.2004.1418559 ◽

2005 ◽

Cited By ~ 5

Author(s):

Yuji Aoyagi Norio Nomura

Keyword(s):

High Frequency ◽

High Frequency Application

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Fabrication and performance of Fe-based magnetic thin film inductor for high-frequency application

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2008.04.136 ◽

2008 ◽

Vol 320 (20) ◽

pp. e963-e966 ◽

Cited By ~ 6

Author(s):

Yong Zhou ◽

Zhi-Min Zhou ◽

Ying Cao ◽

Xiao-Yu Gao ◽

Wen Ding

Keyword(s):

Thin Film ◽

High Frequency ◽

Magnetic Thin Film ◽

High Frequency Application ◽

And Performance

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High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)

Geologica Carpathica ◽

10.2478/v10096-009-0042-z ◽

2010 ◽

Vol 61 (1) ◽

pp. 29-38

Author(s):

Damir Bucković ◽

Maja Martinuš ◽

Duje Kukoč ◽

Blanka Tešović ◽

Ivan Gušić

Keyword(s):

Sea Level ◽

Deep Water ◽

High Frequency ◽

Upper Cretaceous ◽

Distal Part ◽

Preferential Orientation ◽

Sea Level Changes ◽

Carbonate Production ◽

Fine Grained ◽

Platform Margin

High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)The upper part of the Middle Coniacian/Santonian-Middle Campanian deep-water Dol Formation of the island of Brač is composed of countless fine-grained allodapic intercalations deposited in an intraplatform trough. Within the studied section 13 beds can be distinguished, each defined by its lower part built up of dark grey limestone with abundance of branched, horizontally to subhorizontally oriented burrows, and the upper part, in which the light grey to white limestone contains larger burrows, rarely branched, showing no preferential orientation. The lower, dark grey, intensively bioturbated levels are interpreted as intervals formed during high-frequency sea-level highstands, while the upper, light grey-to-white levels are interpreted as intervals formed during the high-frequency sea-level lowstands. Cyclic alternation of these two intervals within the fine-grained allodapic beds is interpreted as the interaction between the amount of carbonate production on the platform margin and the periodicity and intensity of shedding and deposition in the distal part of toe-of-slope environment, which is governed by Milankovitch-band high frequency sea-level changes.

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Peculiarities of pigment complex functioning of winter wheat plants depending on the fertilizer application method

PLANT AND SOIL SCIENCE ◽

10.31548/agr2021.03.007 ◽

2021 ◽

Vol 12 (3) ◽

pp. 7-16

Author(s):

Z. Bilousova ◽

◽

V. Keneva ◽

Y. Klipakova ◽

◽

...

Keyword(s):

Winter Wheat ◽

Magnesium Sulfate ◽

Chlorophyll Content ◽

Photosynthetic Apparatus ◽

Fertilizer Application ◽

Pigment Content ◽

Plant Leaves ◽

Significant Difference ◽

Foliar Treatment ◽

Pigment Complex

To obtain the maximum yield of winter wheat, it is necessary to further optimize the existing cultivation technologies in the direction of their adaptation to changing environmental conditions. One of the areas of adaptation of plants to adverse abiotic factors is the active functioning of the photosynthetic apparatus, which depends on the amount of nutrients introduced. The influence of fertilizer application on the condition of the pigment complex of winter wheat plants in the conditions of the Southern Steppe of Ukraine has been studied. Two varieties of winter wheat were selected for the study: Shestopalivka and Mason. The experiment scheme involved the application of fertilizers at sowing (K0; K12) and foliar treatment with various tank mixtures (urea; urea + magnesium sulfate; urea + magnesium sulfate + potassium monophosphate). The pigment content has been determined by grinding fresh leaves of winter wheat, followed by the addition of a solvent in the form of acetone. Measurements of pigments were performed using a spectrophotometer. According to the research results, it was established that before the foliar treatment the a-chlorophyll content and carotenoids was higher in the plant leaves of the Shestopalivka variety. At the same time, the b-chlorophyll content on the contrary was higher for plants of the Mason variety by 17%, which may be due to the adaptation of plants of this variety to lack of light. On the 3rd day after foliar treatment, a decrease in the pigment content in the plant leaves of all experimental variants has been observed, which was due to the active growth of the photosynthetic surface and a decrease in the total dry matter mass. There was no significant difference between the varieties of the content of photosynthetic pigments in this period. On the 10th day after foliar treatment, an increase in a- and b-chlorophyll content has been observed for both studied varieties, which may be the result of adaptation of the photosynthetic apparatus of winter wheat plants to lighting conditions. Foliar treatment of winter wheat plants with a tank mixture of urea with magnesium sulfate and potassium monophosphate contributed to a further increase in the content of a-chlorophyll by 12-23%, and b-chlorophyll by 5-37% depending on the variety compared to the control. The results of the research testify to the high efficiency of complex application of nitrogen-phosphorus-potassium fertilizers for foliar treatment of winter wheat plants in the BBCH 31 stage, both against the background of pre-sowing application of potassium fertilizers and without it.

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Characterization and enhancement of magnetic performance of electrodeposited Ni45Fe55 on PCB for high frequency application

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2020.166708 ◽

2020 ◽

Vol 505 ◽

pp. 166708

Author(s):

Z. Ghaferi ◽

P. McCloskey

Keyword(s):

High Frequency ◽

Magnetic Performance ◽

High Frequency Application

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Oxidation in Sea Water

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s002531540000936x ◽

1925 ◽

Vol 13 (4) ◽

pp. 953-969 ◽

Cited By ~ 17

Author(s):

H. W. Harvey

Keyword(s):

Hydrogen Peroxide ◽

Deep Water ◽

Sea Water ◽

Iron Compound ◽

English Channel ◽

Organic Substances ◽

Inshore Water ◽

Monomolecular Reaction ◽

Saturated Water ◽

Inshore Waters

1. Putrefaction in sea-water sets free compounds toxic to Calanus. A portion of these compounds withstands oxidation to non-toxic forms in air saturated water for considerable periods.2. “Deep water” from the English Channel contains a catalyst, probably an iron compound, which increases the rate of oxidation of a number of easily oxidisable organic compounds. Its action is inhibited in surface and inshore waters by dissolved organic matter.3. Hydrogen peroxide decomposes relatively quickly in “deep water” from the English Channel, at a velocity corresponding to that of a monomolecular reaction. A catalyst, probably an iron compound, active towards hydrogen peroxide, occurs in sea-water. The action of the catalyst is inhibited by dissolved organic substances in surface and inshore water, until such substances are oxidised by the hydrogen peroxide.

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