scholarly journals Nutritional disorder in Pfaffia glomerata by mercury excess in nutrient solution

2015 ◽  
Vol 46 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Nicéia Spanholi Calgaroto ◽  
Fernando Teixeira Nicoloso ◽  
Luciane Belmonte Pereira ◽  
Denise Cargnelutti ◽  
Fabiane Goldschmidt Antes ◽  
...  
Keyword(s):  
Nutrient Solution ◽  
The Other ◽  
Nutrient Concentrations ◽  
Nutritional Disorder ◽  
Pfaffia Glomerata ◽  
P Concentration ◽  
Other Hand ◽  
Fe And Mn ◽  
Tissue Nutrient Concentrations ◽  
Mn Concentrations

ABSTRACT: The mineral nutritional homeostasis in response to different concentrations of Hg (0, 25 and 50μM) was evaluated in Pfaffia glomerata plant. The exposure to the highest level of Hg (50µM) caused a decreasing in shoot and root fresh weights of 15.5% and 20%, respectively. Both shoot and root Hg concentrations increased linearly with increasing external Hg concentrations. Ca concentration decreased in shoot only at 50µM Hg, whereas shoot K and Mg concentrations decreased at both 25 and 50µM Hg, when compared to the control. A significant decrease in Cu, Zn, Fe and Mn concentrations in plants exposed to Hg was observed, but most Zn, Mn, and Cu in the roots. On the other hand, P concentration increased in both root and shoot of plants exposed at 25 and 50µM Hg, whereas Na concentration increased only in the root at 25 and 50µM Hg exposure. In general, tissue nutrient concentrations in P. glomerata plantlets exposed to Hg were significantly decreased, which indicates that the Hg may cause alteration on the mineral nutritional homeostasis of this species.

MICROSCOPY AND ELECTRON MICROPROBE ANALYSIS OF SOME IRON–MANGANESE PANS FROM NEWFOUNDLAND

1973 ◽  
Vol 53 (4) ◽  
pp. 349-361 ◽  
Author(s):  
R. BREWER ◽  
R. PROTZ ◽  
J. A. McKEAGUE
Keyword(s):  
Electron Microprobe ◽  
Light Microscope ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
The Other ◽  
Reflected Light ◽  
Fe And Mn ◽  
Iron Manganese ◽  
Mn Concentrations

A number of thin iron–manganese pans from soils with peaty surface horizons have been examined with a light microscope and electron microprobe analyzer. The results show that: (1) concentrations of Fe and Mn (as oxides, hydroxides, or both) occur distinctly separated from each other even where closely associated, i.e., every unit analyzed was dominantly either Mn or Fe with little contamination by the other; (2) Mn concentrations always increase in proportion to Fe with increasing depth in the pans; generally Mn concentrations underlie Fe concentrations; (3) at least in these pans, the various kinds of Fe and Mn concentrations can be distinguished optically by using both transmitted and reflected light characteristics.

scholarly journals Analisis Kadar Kalium (K) dan Posforus (P) Pada Limbah Kangkung Darat (Ipomea reptans Poir)

2018 ◽  
Vol 7 (1) ◽  
pp. 32
Author(s):  
Rahmadiana Setianingsih ◽  
Siti Nuryanti ◽  
Ratman Ratman
Keyword(s):  
The Other ◽  
Average Value ◽  
P Concentration ◽  
Other Hand ◽  
K Concentration

This research is aimed to determine potassium (K) and phosphorus (P) levels in the waste of swamp cabbage. The Spectrodirect instrument was used to analyze the levels of potassium and phosphorus in the waste of swamp cabbage. Based on analysis of the levels of potassium and phosphorus in the waste of swam cabbage, it was obtained that the average value of K concentration in the sample was 5.51213 mg/kg. On the other hand, the average value of P concentration in the sample was 43.19503 mg/kg. From the result of this analysis, it also demonstrated that the concentration of phosphorus was higher than the concentration of potassium.

scholarly journals Interactive Effects of the Potassium and Nitrogen Relationship on Yield and Quality of Strawberry Grown Under Soilless Conditions

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 441
Author(s):  
Pablo Preciado-Rangel ◽  
Enrique Troyo-Diéguez ◽  
Luis Alonso Valdez-Aguilar ◽  
José Luis García-Hernández ◽  
José Guadalupe Luna-Ortega
Keyword(s):  
Nutrient Solution ◽  
Fruit Quality ◽  
Ionic Concentration ◽  
The Other ◽  
Interactive Effects ◽  
Strawberry Fruit ◽  
Yield And Quality ◽  
Other Hand

K and N are the nutrients with the highest influence on yield and fruit quality. From this perspective, the aim of this study was to determine the effect of N as NO3−, K+ and their interactions on the yield and quality of strawberries grown under soilless conditions. A solution comprised of micronutrients based on an amended Steiner’s Universal Nutrient Solution was mixed with 4 levels of K+ (5, 7, 9 and 11 mol m−3) and 3 levels of NO3− (9, 12, and 15 mol m−3) to obtain 12 treatments. The results suggest that 15 mol m−3 of NO3− in the nutrient solution produced the highest yield, but fruit with low nutraceutical quality. On the other hand, 11 mol m−3 of K+ in the nutrient solution produced the highest yield and fruit with the best nutraceutical quality. The ionic concentration of the Universal Steiner’s Nutrient Solution proved to be the best nutritional option to maximize the yield and nutraceutical quality of strawberry fruit. The increase in NO3− concentration in the nutrient solution produced a higher yield of strawberries, while a higher concentration of K+ improved fruit quality, thus reaffirming the significance of nutrients within the plant functioning of this crop.

scholarly journals Development of tomato plants growing on nutrient solution containing ammonium salts in the presence of various doses of potassium

2015 ◽  
Vol 44 (1) ◽  
pp. 3-13
Author(s):  
J. Stabrowska ◽  
J. Kozłowska
Keyword(s):  
Plant Growth ◽  
Nutrient Solution ◽  
The Other ◽  
Ammonium Salts ◽  
Tomato Plants ◽  
Other Hand ◽  
Nutrient Solutions

In all the experiments the best development of tomato plants was observed when nutrient solutions containing 1/3 of full doses of potassium were applied (i.e. when the N : K ratio = 0.84). On the other hand, the poorest development of plants was observed in combinations with 1/100 of the full potassium dose. Tenfold doses of potassium added to the nutrient solution de-pressed markedly plant growth, particularly at pH 7.6. The supply of potassium in the nutrient solution was correlated with the nitrogen, potassium and calcium amounts absorbed by the plants.

Patterns of canopy interception and throughfall along a topographic sequence for black spruce dominated forest ecosystems in northwestern Ontario

2003 ◽  
Vol 33 (6) ◽  
pp. 1046-1060 ◽  
Author(s):  
Dave M Morris ◽  
Alan G Gordon ◽  
Andrew M Gordon
Keyword(s):  
Black Spruce ◽  
Inorganic Nitrogen ◽  
The Other ◽  
Organic N ◽  
Nutrient Concentrations ◽  
Canopy Interception ◽  
Area Index ◽  
Northwestern Ontario ◽  
Other Hand ◽  
Study Sites

A 3-year (1993–1995) study was conducted to describe both the spatial (within- and between-site) and temporal (monthly) patterns associated with canopy interception, throughfall, and net forest water along a black spruce (Picea mariana (Mill.) BSP) topo-sequence situated in northwestern Ontario. This site array included (1) an upland, well-drained, mineral soil site; (2) a poorly drained, midslope, wet mineral site; and (3) a treed wetland on organic (peat) soil. Bulk precipitation (BP) and throughfall (TF) were collected, on an event basis (63 events, over 4800 samples analyzed), using standard collecting devices and analyzed for total Kjeldahl nitrogen (TKN), ammonium (NH4+), nitrate (NO3–), total phosphorus (TP), potassium (K), calcium (Ca), and magnesium (Mg). Comparison of BP and TF data suggested that an enrichment of K (190%), Mg (115%), and Ca (70%) occurred during canopy interactions. On the other hand, inorganic nitrogen (NH4+: –73%; NO3–: –47%), and to a lesser extent TP (–35%), rates declined. TKN, however, remained the same, suggesting that inorganic N reductions were offset by organic N inputs. Downward shifts in pH were also detected for TF (4.45–4.48), as compared with the pH of BP (4.52–4.80). Although all study sites received similar rainfall amounts, the more productive sites (i.e., carrying greater foliar mass, higher leaf area index) had lower TF volumes (i.e., higher interception rates) but higher macronutrient returns to the forest floor. This increase in macronutrient deposition was directly related to substantial increases in nutrient concentrations, which, in turn, suggested a greater degree of canopy interaction and (or) leaching on these sites. Throughfall pH, however, was not significantly different across the three study sites. With respect to temporal patterns, the major cations (K+, Ca2+, Mg2+) demonstrated an increasing trend in concentration levels in TF as the season progressed to a maximum in October. TKN and TP concentrations, on the other hand, maintained relatively stable levels throughout the summer, peaking in September, but dropping substantially in October as metabolic processes slowed and the supply of these nutrients to the foliage was reduced. Even with the increase in base cation concentration, throughfall pH shifted downward to 4.3 or below by late fall.

scholarly journals Effects of Nutrient Solution Concentration and Daily Light Integral on Growth and Nutrient Concentration of Several Basil Species in Hydroponic Production

HortScience ◽  
2018 ◽  
Vol 53 (9) ◽  
pp. 1319-1325 ◽  
Author(s):  
Kellie J. Walters ◽  
Christopher J. Currey
Keyword(s):  
Nutrient Solution ◽  
Nutrient Concentration ◽  
Dry Weight ◽  
Solution Concentration ◽  
Mineral Nutrient ◽  
Nutrient Concentrations ◽  
Node Number ◽  
Sweet Basil ◽  
Nutrient Film Technique ◽  
Tissue Nutrient Concentrations

Our objective was to quantify the effect of mineral nutrient concentration of a nutrient solution on the growth of basil species and cultivars grown under high and low photosynthetic daily light integrals (DLIs). Sweet basil (Ocimum basilicum ‘Nufar’), lemon basil (O. ×citriodorum ‘Lime’), and holy basil (O. tenuiflorum ‘Holy’) seedlings were transplanted into nutrient-film technique (NFT) systems with different nutrient solution electrical conductivities (EC; 0.5, 1.0, 2.0, 3.0, or 4.0 dS·m–1) in greenhouses with a low (≈7 mol·m–2·d–1) or high (≈15 mol·m–2·d–1) DLI. Although nutrient solution EC did not affect growth and morphology, increasing DLI did. For example, when sweet basil was grown under a high DLI, the fresh and dry weight, height, and node number increased by 144%, 178%, 20%, and 18%, respectively, compared with plants grown under the low DLI, and branching was also stimulated. In contrast, DLI had little effect on tissue nutrient concentration, although nutrient solution did. Most tissue nutrient concentrations increased with increasing EC, with the exception of Mg and Ca. For example, N in sweet basil increased by 0.6% to 0.7% whereas Mg decreased by 0.2% as EC increased from 0.5 to 4.0 dS·m–1. Across treatments and basil species, tissue nutrient concentrations were generally within recommended ranges with no visible deficiencies. Based on our results, nutrient solution concentrations for hydroponic basil production can be selected based on factors such as other species grown in the same solution or by reducing fertilizer inputs.

scholarly journals Response of Lettuce (Lactuca Sativa L.) to Selenium in Nutrient Solution Contaminated with Nickel

2007 ◽  
Vol 67 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Barbara Hawrylak ◽  
Renata Matraszek ◽  
Maria Szymańska
Keyword(s):  
Toxic Effect ◽  
Crop Yield ◽  
Nutrient Solution ◽  
Lactuca Sativa ◽  
The Other ◽  
Lactuca Sativa L ◽  
Other Hand ◽  
Nickel Uptake

Response of Lettuce (Lactuca SativaL.) to Selenium in Nutrient Solution Contaminated with NickelThe influence of two selenium concentrations (5 and 20 μM) on crop yield, the content of chlorophyll, carotenoids and anthocyanins, as well as accumulation of nickel, selenium and sulphur were studied in the leaves of 50 μM Ni-stressed lettuce plants. Experiments were carried out in water cultures. The obtained results suggest that selenium at concentration of 5 μM in nickel contaminated medium positively affected plants by stimulating their growth, increasing the concentration of assimilation pigments, and thereby at least partially prevented the toxic effect of nickel excess. Moreover, in plants enrichment with selenium a higher increase in content of chlorophyllathanbas well as a higher concentration of carotenoids were found. On the other hand, selenium affected a greater nickel uptake by lettuce plants.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

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