INFLUENCE OF CULTURE SOLUTION TEMPERATURE ON UPTAKE OF RADIOCALCIUM BY FLUE-CURED TOBACCO

1963 ◽  
Vol 43 (4) ◽  
pp. 447-450
Author(s):  
E. T. McEvoy
Keyword(s):  
Root Growth ◽  
Temperature Increase ◽  
Solution Temperature ◽  
Culture Solution ◽  
Root Temperature ◽  
Significant Difference ◽  
Increasing Temperature

Ca45 uptake by flue-cured tobacco increased significantly with increase in root temperature from 20° to 30 °C. during a 6-day absorption period. A further temperature increase to 35 °C. resulted in a non-significant difference in Ca45 uptake. The increase in Ca45 uptake with increasing temperature was not related to increase in root growth during the absorption period.

INFLUENCE OF CULTURE SOLUTION TEMPERATURE ON UPTAKE OF PHOSPHORUS BY FLUE-CURED TOBACCO PLANTS

1960 ◽  
Vol 40 (2) ◽  
pp. 211-217 ◽  
Author(s):  
E. T. McEvoy
Keyword(s):  
Root Growth ◽  
Temperature Increase ◽  
Culture Medium ◽  
Solution Culture ◽  
Solution Temperature ◽  
Culture Solution ◽  
Tobacco Plants ◽  
Radioactive Phosphorus ◽  
Increasing Temperature

The influence of the temperature of the culture medium on the uptake of phosphorus by flue-cured tobacco plants was studied in solution culture, using radioactive phosphorus. P32 uptake increased significantly with temperature increase from 10° to 35 °C. for absorption periods of 2, 4, and 6 days. There was a further increase in P32 uptake at 40 °C. for absorption periods of 2 and 4 days but a decrease after 4 days. Increase in root growth during the absorption periods bore no relation to increase in P32 uptake with increasing temperature.

scholarly journals Thermo- and Photoresponsive Behaviors of Dual-Stimuli-Responsive Organogels Consisting of Homopolymers of Coumarin-Containing Methacrylate

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 329
Author(s):  
Seidai Okada ◽  
Eriko Sato
Keyword(s):  
Functional Group ◽  
Solution Temperature ◽  
Stimuli Responsive ◽  
Critical Solution Temperature ◽  
Equilibrium Degree ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Dual Functional ◽  
Wide Range ◽  
Increasing Temperature

Coumarin-containing vinyl homopolymers, such as poly(7-methacryloyloxycoumarin) (P1a) and poly(7-(2′-methacryloyloxyethoxy)coumarin) (P1b), show a lower critical solution temperature (LCST) in chloroform, which can be controlled by the [2 + 2] photochemical cycloaddition of the coumarin moiety, and they are recognized as monofunctional dual-stimuli-responsive polymers. A single functional group of monofunctional dual-stimuli-responsive polymers responds to dual stimuli and can be introduced more uniformly and densely than those of dual-functional dual-stimuli-responsive polymers. In this study, considering a wide range of applications, organogels consisting of P1a and P1b, i.e., P1a-gel and P1b-gel, respectively, were synthesized, and their thermo- and photoresponsive behaviors in chloroform were investigated in detail. P1a-gel and P1b-gel in a swollen state (transparent) exhibited phase separation (turbid) through a temperature jump and reached a shrunken state (transparent), i.e., an equilibrium state, over time. Moreover, the equilibrium degree of swelling decreased non-linearly with increasing temperature. Furthermore, different thermoresponsive sites were photopatterned on the organogel through the photodimerization of the coumarin unit. The organogels consisting of homopolymers of coumarin-containing methacrylate exhibited unique thermo- and photoresponsivities and behaved as monofunctional dual-stimuli-responsive organogels.

scholarly journals Thermo-Responsive Behavior of Mixed Aqueous Solution of Hydrophilic Polymer with Pendant Phosphorylcholine Group and Poly(Acrylic Acid)

Polymers ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 148
Author(s):  
Hirokazu Fukumoto ◽  
Kazuhiko Ishihara ◽  
Shin-Ichi Yusa
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Solution Temperature ◽  
Interpolymer Complex ◽  
Mixed Aqueous Solution ◽  
Upper Critical Solution Temperature ◽  
Acidic Conditions ◽  
Decreasing Ph ◽  
Increasing Temperature ◽  
Poly Acrylic Acid

A mixed aqueous solution of hydrophilic poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) and poly(acrylic acid) (PAAc) becomes cloudy under acidic conditions at room temperature. The pendant carboxylic acid groups in PAAc form hydrogen bonds with the ester and phosphate groups in PMPC. While the polymers aggregate under acidic conditions, neither one associate under basic conditions because of the deprotonation of the pendant carboxy groups in PAAc. We observed that the interpolymer complex formed from PMPC, and PAAc was dissociated in aqueous solutions with increasing temperature, which is an upper critical solution temperature behavior. With increasing temperature, the molecular motion increased to dissociate the interpolymer complex. The phase transition temperature increased with increasing polymer and salt concentrations, and with decreasing pH.

Effects of Temperature on Root Morphology and Ectendomycorrhizal Development in Pinusresinosa Ait.

1975 ◽  
Vol 5 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Hugh E. Wilcox ◽  
Ruth Ganmore-Neumann
Keyword(s):  
Root Growth ◽  
Root System ◽  
Root Morphology ◽  
Root Systems ◽  
Second Order ◽  
Root Temperature ◽  
First Order ◽  
Effects Of Temperature

Seedlings of Pinusresinosa were grown at root temperatures of 16, 21 and 27 °C, both aseptically and after inoculation with the ectendomycorrhizal fungus BDG-58. Growth after 3 months was significantly influenced by the presence of the fungus at all 3 temperatures. The influence of the fungus on root growth was obscured by the effects of root temperature on morphology. The root system at 16 and at 21 °C possessed many first-order laterals with numerous, well developed second-order branches, but those at 27 °C had only a few, relatively long, unbranched first-order laterals. Although the root systems of infected seedlings were larger, the fungus increased root growth in the same pattern as determined by the temperature.

scholarly journals Temperature and pH of the nutrient solution on wheat primary root growth

2004 ◽  
Vol 61 (3) ◽  
pp. 313-318 ◽  
Author(s):  
Carlos Eduardo de Oliveira Camargo ◽  
Antonio Wilson Penteado Ferreira Filho ◽  
Marcus Vinicius Salomon
Keyword(s):  
Root Growth ◽  
Nutrient Solution ◽  
Primary Root ◽  
Growth Period ◽  
Triticum Aestivum L ◽  
Solution Temperature ◽  
Stages Of Development ◽  
Primary Root Growth ◽  
Temperature And Growth ◽  
Nutrient Solutions

Primary root growth is very important for wheat (Triticum aestivum L.) crop in upland conditions in the State of São Paulo. Fourteen wheat genotypes (mutant lines and cultivars) were evaluated for primary root growth during 7 and 15 days of development in complete and aerated nutrient solutions, in the laboratory. In the first experiment, solutions with three pH values (4.0, 5.0 and 6.0) at constant temperature (24 ± 1°C), and in the second experiment, solutions with the same pH (4.0) but with three temperatures (18°C ± 1°C, 24°C ± 1°C and 30°C ± 1°C) were used. High genetic variability was observed among the evaluated genotypes in relation to primary root growth in the first stages of development in nutrient solutions independent of pH, temperature and growth period. Genotypes 6 (BH-1146) and 13 (IAC-17), tolerant to Al3+ showed genetic potential for root growth in the first stages of development (7 and 15 days), regardless of nutrient solution temperature and pH. Genotypes 14 (IAC-24 M), 15 (IAC-24), 17 (MON"S" / ALD "S") ´ IAC-24 M2, 18 (MON"S" / ALD "S") ´ IAC-24 M3 and 24 (KAUZ"S" / IAC-24 M3), tolerant to Al3+, showed reduced root growth under the same conditions.

scholarly journals Implications of Agricultural Gypsum Doses in Physical-Hydric Attributes of a Typic Haplortox and on Root Growth and Soybean Productivity

2019 ◽  
Vol 11 (4) ◽  
pp. 549
Author(s):  
Francisco de Assis Guedes Júnior ◽  
Deonir Secco ◽  
Luiz Antônio Zanão Júnior ◽  
Luciene Kazue Tokura ◽  
Marcos Felipe Leal Martins
Keyword(s):  
Hydraulic Conductivity ◽  
Root Growth ◽  
Block Design ◽  
Total Porosity ◽  
Calcium Deficiency ◽  
Saturated Hydraulic Conductivity ◽  
Soil Density ◽  
Randomized Block Design ◽  
Significant Difference ◽  
Physical Attributes

The response to agricultural gypsum, as a conditioner of the root environment in depth, has been observed for most annual crops. These responses are attributed to the better distribution of roots of the crops in depth in the soil by the reduction of chemical impediments, caused by the exchangeable aluminum and calcium deficiency in these layers, which allows to the plants the use of greater volume of water when they occur summer. In this way, the objective of this study was to evaluate the effects of gypsum doses on physical-hydric attributes, root growth and soybean productivity. The experiment was conducted at the Agronomic Institute of Paraná (IAPAR) in Santa Tereza do Oeste-PR. The soil was classified as Typic Haplortox. Five doses of agricultural gypsum were evaluated: 0; 3; 6; 9 and 12 t ha-1, in outline randomized block design with six repetitions. Soil density, total porosity, macroporosity, microporosity and saturated hydraulic conductivity were evaluated at layers of 0.0-0.1; 0.1-0.2 and 0.2-0.3 m. Soybean productivity and root growth were also evaluated. Data were submitted to regression analysis. The physical attributes soil density, macroporosity and saturated hydraulic conductivity did not differ significantly with the application of the gypsum doses in the 0.0-0.1 and 0.2-0.3 m layers. However, in the 0.1-0.2 m layer, due to pressures imposed by the machines and agricultural implements deforming the soil, there were significant differences in the physical attributes of the density, macroporosity and saturated hydraulic conductivity. There was no significant difference in grain productivity and root growth of soybean.

Abstract 18473: Rates and Risk Factors for Faster Aortic Root Growth in Pediatric Patients with Marfan Syndrome

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Nitya Viswanathan ◽  
Claudia Pedroza ◽  
Shaine A Morris
Keyword(s):  
Aortic Dissection ◽  
Root Growth ◽  
Marfan Syndrome ◽  
Aortic Root ◽  
Scoliosis Surgery ◽  
Z Score ◽  
Aortic Dilation ◽  
Significant Difference ◽  
Over Time ◽  
Infantile Type

Background: Marfan Syndrome (MS) is associated with progressive aortic dilation and aortic dissection. Aortic dissection is typically preceded by aortic dilation. The goal of this study is to identify factors associated with faster rates of aortic root dilation in children with MS. Methods: Patients undergoing serial transthoracic echocardiograms (TTE) with MS were retrospectively identified from an institutional database. Those with >2 TTEs over 1 year apart and <21 years of age at first TTE were included. TTEs performed after aortic surgery were excluded. Using multivariable longitudinal linear regression analysis, sex, medication, presence of ectopia lentis, need for scoliosis surgery and infantile type of MS were evaluated for associations with rate of change in aortic root dimension and aortic root z-score over time. Results: Of 240 patients with MS, 146 were included. Median age at first TTE was 8.1 yrs (range 0-20.9 years), median length of follow up 6.5 years (range 1.0-20.1 years), and median number of studies was 8 (range 2-25). Sixty-one percent were male. Of the 146 patients, 123 (84%) were documented to be on medical therapy: 14 angiotensin receptor blocker (ARB), 66 B-Blocker (BB), 10 prior history of both, 5 BB+ARB, 27 were in the Pediatric Heart Network medication trial, 1 ACE inhibitor. Sixteen patients underwent root replacement surgery at a median age of 14.6 years (range 1.8-24). No patients had aortic dissection. Three patients had infantile MS. All of these patients underwent root replacement at 1.8, 2 and 4 years of age. Two underwent subsequent aortic root replacement at 6 and 8 years old. Mean rate of aortic root growth in the cohort was 0.12cm/year, and mean change in z-score was 0.02/year (p=0.23 compared to expected rate of no change). The only variable associated with faster root growth was infantile MS (1.3cm/year, p<0.001; z-score change of 6.9/year, p<0.001). There was no significant difference in the rate of aortic root growth between patients who received therapy with BB vs. ARB vs. BB+ARB. Conclusions: Children with MS did not have a significant change in aortic root z-score over time, and the only factor associated with more rapid aortic root growth was infantile type MS.

scholarly journals Influence of Pyrolysis Temperature on Cadmium Removal Capacity and Mechanism by Maize Straw and Platanus Leaves Biochars

2019 ◽  
Vol 16 (5) ◽  
pp. 845 ◽  
Author(s):  
Haixia Wang ◽  
Mingliang Zhang ◽  
Qi Lv
Keyword(s):  
Cation Exchange ◽  
Pyrolysis Temperature ◽  
Xrd Analysis ◽  
Cadmium Removal ◽  
Removal Capacity ◽  
Significant Difference ◽  
Maize Straw ◽  
Balance Analysis ◽  
Increasing Temperature ◽  
Cd Removal

The influence of pyrolysis temperature on cadmium (Cd) removal capacity and mechanisms by maize straw biochars (MSB) and Platanus leaves biochars (PLB) pyrolyzed at 300, 400, 500 and 600 °C was investigated. The results showed that the biochars pyrolyzed at 500 °C had the highest adsorption capacity for Cd, and the maximum adsorption at pH 5.0 was 35.46 mg/g and 25.45 mg/g for MSB and PLB, respectively. The increase in adsorption efficiency with increasing temperature indicated that the adsorption of Cd onto the biochars was endothermic. Based on the balance analysis between cations (Ca2+ and Mg2+) released and Cd adsorbed onto biochar in combination with SEM-EDX, FTIR, and XRD analysis, it was concluded that cation exchange, complexation with surface functional groups, precipitation with minerals (CdCO3), and coordination with π electrons were the dominant mechanisms responsible for Cd adsorption by MSB. With the pyrolysis temperature increasing from 300 to 600 °C, the contribution of cation exchange (Ca2+ and Mg2+) on Cd removal by MSB decreased from 37.4% to 11.7%, while the contribution of precipitation with Otavite (CdCO3) and Cd2+-π electrons interaction increased. For PLB, the insoluble Cd minerals were not detected by XRD, and the contribution of cation exchange had no significant difference for PLB pyrolyzed at 300, 400, 500 and 600 °C.

Microstructure and Nanoindentation Studies of Hydridated Zircaloy-4 Claddings After High Temperature Oxidation

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Petra Gávelová ◽  
Patricie Halodová ◽  
Daniela Marušáková ◽  
Ondřej Libera ◽  
Jakub Krejčí ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxygen Concentration ◽  
Hydrogen Content ◽  
Oxygen Solubility ◽  
Pressurized Water ◽  
Temperature Oxidation ◽  
Β Phase ◽  
Significant Difference ◽  
Water Reactors ◽  
Increasing Temperature

Abstract Zirconium-based alloys are one of the most significant materials in thermal-neutron reactor systems. With very low neutron capture cross section, good corrosion resistance, mechanical strength and resistance to neutron radiation damage, zirconium alloys are used for fuel claddings. Cladding materials are still improved and tested in normal as well as critical reactor conditions. Zircaloy-4 (Zr-1.5Sn-0.2Fe-0.1Cr) is used for west types of light-water reactors, Pressurized Water Reactors (PWR). In our study, Zircaloy-4 cladding tubes were high-temperature oxidized in steam at the series of temperatures from 950 up to 1425 °C to simulate PWR reaching severe accident conditions. To observe the influence of hydrogen (H) diffusing from the coolant water on oxidation process, the specimens with ∼1000 ppm H were compared to the specimens with almost no hydrogen content. Wave Dispersive Spectroscopy (WDS) and nanoindentation were performed in line profiles across the cladding wall. Both methods contributed to verify the pseudobinary Zircaloy-4/oxygen phase diagram with focus on determination of phase boundaries. The increase of oxygen concentration with increasing temperature was observed. Moreover, oxygen concentration profiles and related change in nanohardness and Young's modulus showed the effect of hydrogen on the cladding microstructure. Hydrogen dissolved in metallic matrix increases the oxygen solubility in prior β-phase, the specimens with 1000 ppm H showed the higher oxygen content at almost all temperatures. As well, material hardening was observed on specimens with 1000 ppm H with significant difference in β-phase, measured on specimens exposed to lowest and highest oxidation temperature. Thus, with increasing temperature and hydrogen content, increased oxygen solubility affects the cladding ductility.

The growth and activity of winter wheat roots in the field: the effect of sowing date and soil type on root growth of high-yielding crops

1984 ◽  
Vol 103 (1) ◽  
pp. 59-74 ◽  
Author(s):  
P. B. Barraclough ◽  
R. A. Leigh
Keyword(s):  
Winter Wheat ◽  
Root Growth ◽  
Grain Yield ◽  
Dry Weight ◽  
Sowing Date ◽  
Thermal Time ◽  
Regression Equations ◽  
Root Dry Weight ◽  
Significant Difference ◽  
Distribution Of Roots

SummaryThe effect of sowing date on root growth of high-yielding crops (8–1 It grain/ha, 85% D.M.) of winter wheat (Triticum aestivum L. cv. Hustler) was measured at Rothamsted and Woburn in 1980 and 1981. Roots were sampled by coring on five occasions and changes in root dry weight and length were determined. The average growth rate between March and June was about 1 g/m2/day (200 m/m2/day), over 5 times that measured between December and March. Increases in root weight or length with time were generally exponential to anthesis when the crops had 101–172 g root/m2 (20–32 km/m2). September-sown wheat had more root than October-sown wheat at all times, but whereas early differences in length were maintained throughout the season, root weights converged between March and June. Overall, there was no significant difference in root dry-matter production between sites at anthesis, but there was a substantial difference between years. Differences in root growth between crops were reduced by plotting the amount of root against either the number of days from sowing or accumulated thermal time. Using che latter, root growth between December and June was reasonably linear although there was some indication of a lag below 500 °C days. Regression equations obtained for the relationships between root growth and accumulated thermal time also fitted previously published data and may provide general descriptions of root growth with time.Roots of September-sown crops reached 1 m depth by December but those of October-sown crops were not detectable at this depth until April. For most crops the distribution of roots with depth was reasonably described by an exponential decay function, with over 50% of the roots in the top 20 cm of soil at all times. At Woburn in 1981, a plough-pan restricted roots to the upper soil horizons for most of the season but apparently had little effect on the total amount of root produced. For one of the experimental crops an empirical mathematical function describing the distribution of roots with depth and time is presented.Using the data from this and previously published studies, the relationship between grain yield and the amount of root at anthesis was investigated. Total root length was positively correlated with grain yield but nonetheless similarly yielding crops could have different-sized root systems. Total root dry weight was poorly correlated with grain yield.

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