scholarly journals The influence of nitrogen fertilizations and light intersity on mother plants productivity and the rooting of cuttings of Chrysanthemum (cultivar - Horim Golden)

2013 ◽  
Vol 45 (1-2) ◽  
pp. 61-74
Author(s):  
Lidia Kozłowska
Keyword(s):  
Light Intensity ◽  
Nitrogen Fertilization ◽  
Carbohydrate Content ◽  
Clear Correlation ◽  
Fluorescent Lamps ◽  
Low Carbohydrate ◽  
Mother Plants ◽  
Rooting Of Cuttings ◽  
Nitrogen Ratio ◽  
High Intensity Light

Mother plants of <i>Chrysanthemum</i> cv. "Horim Golden" have been cultivated at three levels of nitrogen fertilization, dosage for a 3 l pot was 100,500,1000 mg N. The plants were growing with fluorescent lamps on (5000 lx or 10000 lx). The rooting of the cuttings obtained under such conditions took place with 5000 lx. The effect of nitrogen on the productivity of mother plants depended on the light intensity. Higher nitrogen doses affected favourably the number of cuttings, the growth and number of roots per cuttings - only when higher light intensity was applied for mother plants. Light of various intensity used in the cultivation of chrysanthemum mother plants had a significantly higher effect on the dynamics of rooting that did nitrogen fertilization. High intensity light, irrespective of the nitrogen dose used, also increased the weight and number of roots per cutting. Moreover, a clear correlation has been found between the carbohydrate content in cuttings and the dynamics of rooting and the number and weight of roots formed. The process of root formation took place later and was slower in cuttings in which a higher carbohydrate content was found; however, the number and weight of roots formed by these cuttings were considerably higher. In cuttings characterised by a low carbohydrate; total nitrogen ratio a decrease in the number and weight of roots has been found.

scholarly journals Growth Quality and Development of Olive Plants Cultured In-Vitro under Different Illumination Regimes

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2214
Author(s):  
Pablo Díaz-Rueda ◽  
Manuel Cantos-Barragán ◽  
José Manuel Colmenero-Flores
Keyword(s):  
Light Intensity ◽  
Light Quality ◽  
Woody Species ◽  
High Sensitivity ◽  
Clear Correlation ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Light Intensities ◽  
Growth Quality

Light-emitting diodes (LEDs) are useful for the in-vitro micropropagation of plants, but little information is available on woody species. This work compares the effects of light quality and intensity on the growth and development of micropropagated olive plants from two different subspecies. Illumination was provided with fluorescent and LED lamps covering different red/blue ratios (90/10, 80/20, 70/30, 60/40) or red/blue/white combinations, as well as different light intensities (30, 34, 40, 52, 56, 84, 98 and 137 µmol m−2 s−1 of photosynthetic photon fluxes, PPF). Olive plants exhibited high sensitivity to light quality and intensity. Higher red/blue ratios or lower light intensities stimulated plant growth and biomass mainly as a consequence of a higher internodal elongation rate, not affecting either the total number of nodes or shoots. In comparison to fluorescent illumination, LED lighting improved leaf area and biomass, which additionally was positively correlated with light intensity. Stomatal frequency was positively, and pigments content negatively, correlated with light intensity, while no clear correlation was observed with light quality. In comparison with fluorescent lamps, LED illumination (particularly the 70/30 red/blue ratio with 34 µmol m−2 s−1 PPF intensity) allowed optimal manipulation and improved the quality of in-vitro micropropagated olive plants.

scholarly journals Nitrogen fertilization and plant density and their impact on the growth indicators and plant winning livestock

2005 ◽  
Vol 2 (1) ◽  
pp. 18-22
Author(s):  
Baghdad Science Journal
Keyword(s):  
Nitrogen Fertilizer ◽  
Nitrogen Fertilization ◽  
Plant Density ◽  
Experiment Design ◽  
Two Factors ◽  
Main Plot ◽  
Nitrogen Ratio ◽  
Growth Indicators

This experiment was conducted in the season 2001-2000 in station Ishaqi the company's general industrial crops to plant livestock Vigna radala deleted (Khadrawi) carried out the experiment design panels splinter and order in RCBD with three balls two factors are levels nitrogen fertilizer (120 and, 100.0 kg urea / ha)nitrogen ratio of 46%, which put in the main panels mAIN PLOT and Alkiavat three levels that were placed in secondary panels .....

scholarly journals Overweight and diabetes prevention: is a low-carbohydrate–high-fat diet recommendable?

2018 ◽  
Vol 57 (4) ◽  
pp. 1301-1312 ◽  
Author(s):  
Fred Brouns
Keyword(s):  
Type 2 Diabetes ◽  
Weight Loss ◽  
Carbohydrate Content ◽  
Food Sources ◽  
Long Term Effects ◽  
High Fat ◽  
Functional Changes ◽  
Low Carbohydrate

Abstract In the past, different types of diet with a generally low-carbohydrate content (< 50–< 20 g/day) have been promoted, for weight loss and diabetes, and the effectiveness of a very low dietary carbohydrate content has always been a matter of debate. A significant reduction in the amount of carbohydrates in the diet is usually accompanied by an increase in the amount of fat and to a lesser extent, also protein. Accordingly, using the term “low carb–high fat” (LCHF) diet is most appropriate. Low/very low intakes of carbohydrate food sources may impact on overall diet quality and long-term effects of such drastic diet changes remain at present unknown. This narrative review highlights recent metabolic and clinical outcomes of studies as well as practical feasibility of low LCHF diets. A few relevant observations are as follows: (1) any diet type resulting in reduced energy intake will result in weight loss and related favorable metabolic and functional changes; (2) short-term LCHF studies show both favorable and less desirable effects; (3) sustained adherence to a ketogenic LCHF diet appears to be difficult. A non-ketogenic diet supplying 100–150 g carbohydrate/day, under good control, may be more practical. (4) There is lack of data supporting long-term efficacy, safety and health benefits of LCHF diets. Any recommendation should be judged in this light. (5) Lifestyle intervention in people at high risk of developing type 2 diabetes, while maintaining a relative carbohydrate-rich diet, results in long-term prevention of progression to type 2 diabetes and is generally seen as safe.

scholarly journals Analysis of the light intensity dependence of the growth ofSynechocystisand of the light distribution in a photobioreactor energized by 635 nm light

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5256 ◽  
Author(s):  
Alessandro Cordara ◽  
Angela Re ◽  
Cristina Pagliano ◽  
Pascal Van Alphen ◽  
Raffaele Pirone ◽  
...  
Keyword(s):  
Light Intensity ◽  
Photosynthetic Activity ◽  
Genetic Manipulation ◽  
Incident Light ◽  
Red Light ◽  
Clear Correlation ◽  
Heterogeneous Distribution ◽  
Cultivation System ◽  
Modelling Studies ◽  
Set Up

Synechocystisgathered momentum in modelling studies and biotechnological applications owing to multiple factors like fast growth, ability to fix carbon dioxide into valuable products, and the relative ease of genetic manipulation.Synechocystisphysiology and metabolism, and consequently, the productivity ofSynechocystis-based photobioreactors (PBRs), are heavily light modulated. Here, we set up a turbidostat-controlled lab-scale cultivation system in order to study the influence of varying orange–red light intensities onSynechocystisgrowth characteristics and photosynthetic activity.Synechocystisgrowth and photosynthetic activity were found to raise as supplied light intensity increased up to 500 μmol photons m−2s−1and to enter the photoinhibition state only at 800 μmol photons m−2s−1. Interestingly, reverting the light to a non-photo-inhibiting intensity unveiledSynechocystisto be able to promptly recover. Furthermore, our characterization displayed a clear correlation between variations in growth rate and cell size, extending a phenomenon previously observed in other cyanobacteria. Further, we applied a modelling approach to simulate the effects produced by varying the incident light intensity on its local distribution within the PBR vessel. Our model simulations suggested that the photosynthetic activity ofSynechocystiscould be enhanced by finely regulating the intensity of the light incident on the PBR in order to prevent cells from experiencing light-induced stress and induce their exploitation of areas of different local light intensity formed in the vessel. In the latter case, the heterogeneous distribution of the local light intensity would allowSynechocystisfor an optimized usage of light.

scholarly journals THE EFFECTS OF LIGHT INTENSITY AND FERTILIZER RATE ON THE ACCLIMATIZATION POTENTIAL OF CHAMAEDOREA ELEGANS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 583b-583 ◽  
Author(s):  
Trinidad Reyes ◽  
Terril A. Nell ◽  
Charles A. Conover ◽  
James E. Barrett
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Carbohydrate Content ◽  
Compensation Point ◽  
Plant Performance ◽  
Fertilizer Rate ◽  
Light Compensation Point ◽  
Light Intensities ◽  
Chamaedorea Elegans ◽  
Fertilizer Rates

Effects of three light intensities (564, 306 and 162 μmol m-2 s-1) and three fertilizer rates (220, 440 and 880 mg/15 cm pot, weekly) were evaluated on acclimatization potential of Chamaedorea elegans. Treatments were applied during four months under greenhouse conditions after which plants were placed indoors (20 μmol m-2 s-1, 21±2C and 50% RH) for two months. Light compensation point (LCP) was significantly reduced by decreasing light intensity and increasing fertilizer rates. Leaf and root fresh and dry weights increased with irradiance while shoots were not affected. Chlorophyll a levels were higher in plants grown under the lowest light intensity. Carbohydrate content is being analyzed and anatomical examination of leaves studied. Plant performance indoors will be discussed. These studies demonstrate that Chamaedorea, a monocot, acclimatizes similarly to dicots.

scholarly journals Ketogenic Diet for Cancer: Critical Assessment and Research Recommendations

Nutrients ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 3562
Author(s):  
Jordin Lane ◽  
Nashira I. Brown ◽  
Shanquela Williams ◽  
Eric P. Plaisance ◽  
Kevin R. Fontaine
Keyword(s):  
Clinical Trials ◽  
Ketogenic Diet ◽  
The United States ◽  
Carbohydrate Content ◽  
Cancer Development ◽  
Antitumor Effects ◽  
Low Protein ◽  
Low Carbohydrate ◽  
Diet And Lifestyle ◽  
Research Recommendations

Despite remarkable improvements in screening, diagnosis, and targeted therapies, cancer remains the second leading cause of death in the United States. It is increasingly clear that diet and lifestyle practices play a substantial role in cancer development and progression. As such, various dietary compositions have been proposed for reducing cancer risk and as potential adjuvant therapies. In this article, we critically assess the preclinical and human trials on the effects of the ketogenic diet (KD, i.e., high-fat, moderate-to-low protein, and very-low carbohydrate content) for cancer-related outcomes. The mechanisms underlying the hypothesized effects of KD, most notably the Warburg Effect, suggest that restricting carbohydrate content may impede cancer development and progression via several pathways (e.g., tumor metabolism, gene expression). Overall, although preclinical studies suggest that KD has antitumor effects, prolongs survival, and prevents cancer development, human clinical trials are equivocal. Because of the lack of high-quality clinical trials, the effects of KD on cancer and as an adjunctive therapy are essentially unknown. We propose a set of research recommendations for clinical studies examining the effects of KD on cancer development and progression.

scholarly journals Dietary Carbohydrate Deprivation Increases 24-Hour Nitrogen Excretion without Affecting Postabsorptive Hepatic or Whole Body Protein Metabolism in Healthy Men

2003 ◽  
Vol 88 (8) ◽  
pp. 3801-3805 ◽  
Author(s):  
P. H. Bisschop ◽  
M. G. M. de Sain-van der Velden ◽  
F. Stellaard ◽  
F. Kuipers ◽  
A. J. Meijer ◽  
...  
Keyword(s):  
Total Energy ◽  
Protein Metabolism ◽  
Carbohydrate Content ◽  
Nitrogen Excretion ◽  
Whole Body ◽  
Dietary Carbohydrate ◽  
High Fat ◽  
Body Protein ◽  
Healthy Men ◽  
Low Carbohydrate

Because insulin is an important regulator of protein metabolism, we hypothesized that physiological modulation of insulin secretion, by means of extreme variations in dietary carbohydrate content, affects postabsorptive protein metabolism. Therefore, we studied the effects of three isocaloric diets with identical protein content and low-carbohydrate/high-fat (2% and 83% of total energy, respectively), intermediate-carbohydrate/intermediate-fat (44% and 41% of total energy, respectively), and high-carbohydrate/low-fat (85% and 0% of total energy, respectively) content in six healthy men. Whole body protein metabolism was assessed by 24-h urinary nitrogen excretion, postabsorptive leucine kinetics, and fibrinogen and albumin synthesis by infusion of [1-13C]leucine and [1-13C]valine. The low-carbohydrate/high-fat diet resulted in lower absorptive and postabsorptive plasma insulin concentrations, and higher rates of nitrogen excretion compared with the other two diets: 15.3 ± 0.9 vs. 12.1 ± 1.1 (P = 0.03) and 10.8 ± 0.5 g/24 h (P = 0.005), respectively. Postabsorptive rates of appearance of leucine and of leucine oxidation were not different among the three diets. In addition, dietary carbohydrate content did not affect the synthesis rates of fibrinogen and albumin. In conclusion, eucaloric carbohydrate deprivation increases 24-h nitrogen loss but does not affect postabsorptive protein metabolism at the hepatic and whole body level. By deduction, dietary carbohydrate is required for an optimal regulation of absorptive, rather than postabsorptive, protein metabolism.

scholarly journals Photosynthetic performance of rocket (Eruca sativa. Mill.) grown under different regimes of light intensity, quality, and photoperiod

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257745
Author(s):  
Naif Ali Elmardy ◽  
Ahmed F. Yousef ◽  
Kui Lin ◽  
Xiwen Zhang ◽  
Muhammad Moaaz Ali ◽  
...  
Keyword(s):  
Light Intensity ◽  
Photosynthetic Performance ◽  
Photochemical Quenching ◽  
Clear Correlation ◽  
Fluorescent Light ◽  
Fluorescence Measurement ◽  
Effective Quantum Yield ◽  
Eruca Sativa ◽  
Closed Chamber ◽  
Psii Photochemistry

In recent years, much effort has been devoted to understanding the response of plants to various light sources, largely due to advances in industry light-emitting diodes (LEDs). In this study, the effect of different light modes on rocket (Eruca sativa. Mill.) photosynthetic performance and other physiological traits was evaluated using an orthogonal design based on a combination between light intensity, quality, and photoperiod factors. Some morphological and biochemical parameters and photosynthetic efficiency of the plants were analyzed. Plants grew in a closed chamber where three light intensities (160, 190, and 220 μmol m-2 s-1) provided by LEDs with a combination of different ratios of red, green, and blue (R:G:B- 7:0:3, 3:0:7, and 5:2:3) and three different photoperiods (light/dark -10/14 h, 12/12 h, and 14/10 h) were used and compared with white fluorescent light (control). This experimental setup allowed us to study the effect of 9 light modes (LM) compared to white light. The analyzes performed showed that the highest levels of chlorophyll a, chlorophyll b, and carotenoids occurred under LM4, LM3, and LM1, respectively. Chlorophyll a fluorescence measurement showed that the best effective quantum yield of PSII photochemistry Y(II), non-photochemical quenching (NPQ), photochemical quenching coefficient (qP), and electron transport ratio (ETR) were obtained under LM2. The data showed that the application of R7:G0:B3 light mode with a shorter photoperiod than 14/10 h (light/dark), regardless of the light intensity used, resulted in a significant increase in growth as well as higher photosynthetic capacity of rocket plants. Since, a clear correlation between the studied traits under the applied light modes was not found, more features should be studied in future experiments.

Quantum Efficiency of Textured a-Si:H P-I-N Solar Cells After High Intensity Light-Soaking

1992 ◽  
Vol 258 ◽  
Author(s):  
X. R. Li ◽  
S. Wagner ◽  
M. Bennett ◽  
S. J. Fonash
Keyword(s):  
Solar Cells ◽  
Light Intensity ◽  
Quantum Efficiency ◽  
White Light ◽  
High Intensity ◽  
Short Circuit ◽  
Experimental Results ◽  
Intensity Dependence ◽  
High Intensity Light

ABSTRACTWe studied the effect of high-intensity light-soaking on the quantum efficiency spectrum of textured a-Si:H solar cells. We report experimental results on the time, temperature, and soaking light intensity dependence of the quantum efficiency (QE) measured in short circuit. Under 3Wcm-2 of white light the QE saturates after 30 minutes. The QE decays little in the blue and strongly in the red. The higher the temperature of saturation, the smaller the decay of the QE.

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