López-Elías JA, R González-Vega, E Márquez-Ríos, W Torres-Arreola

Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 331-337, 2015, DOI:10.32604/phyton.2015.84.331

Abstract Proteins are one of the major metabolites in biomass from microalgae that constitute the diet of marine organisms grown in aquaculture, and are essential for their growth. The quantity of this component is influenced by nutrients, temperature and light intensity, among others. We examined the growth, biomass production and protein of Chaetoceros muelleri with two sources of nitrogen (nitrate and urea) at three concentrations, using the medium f/2 (0.88 mol/L) (nitrates) as control. The treatments were the medium 2f (3.53 mol/L) and 4f (7.05 mol/L) with NO_3^-, and the medium f/2 (0.88 mol/L), 2f (3.53mol/L) and 4f (7.05 mol/L) with… More >

Adams RH, AL Álvarez-Ovando, G Castañón N

Phyton-International Journal of Experimental Botany, Vol.84, No.1, pp. 222-232, 2015, DOI:10.32604/phyton.2015.84.222

Abstract In this study, the relationship between the concentration of extra-heavy crude petroleum in a clayey material and the toxicity, field capacity, temperature, and growth of a tropical forage grass (Brachiara humidicola) was determined empirically. For this type of petroleum the acute toxicity (Microtox^®) was slight (CE₅₀ = 63200 - 76400 mg/kg) even at high hydrocarbon concentrations (29279 mg/kg). Nonetheless, serious impacts were encountered in terms of an increase in soil temperature (+ 1.3 °C), reduction in field capacity (-10.7%) and reduction in aerial biomass (-97%). The relationship between hydrocarbon concentration and biomass resulted in a typical dose-response curve (r =… More >

Rivera-Reyes¹ JG, FA Peraza-Luna², JC Serratos-Arévalo², P Posos-Ponce³, SH Guzmán-Maldonado⁴, E Cortez-Baheza¹, G Castañón-Nájera⁵, M Mendoza-Elos^1*

Phyton-International Journal of Experimental Botany, Vol.78, pp. 37-42, 2009, DOI:10.32604/phyton.2009.78.037

Abstract Oats cereal is a worldwide significant crop. It is grown in restrictive climates and in rainy regions of temperate areas. Cultivation of oats produces high forage yields and grain quality, which gives it a wide variety of uses as animal feed and human food. However, the physiological quality of oat seeds in Mexico faces problems, which impact both their import and export. Phytic acid concentration in the oat seed plays a very important role since it affects seed viability, its germination capacity and potential seedling vigor. The objective of this study was to determine the effect of chemical fertilization on… More >

Galatro Andrea, Ivan Rousseau, Susana Puntarulo

Phyton-International Journal of Experimental Botany, Vol.75, pp. 7-20, 2006, DOI:10.32604/phyton.2006.75.007

Abstract Electron Paramagnetic Resonance (EPR) has been developed as a versatile field that uses different techniques sharing the common feature of resonant micro-wave radiation absorption by paramagnetic substances. Certain free radicals, such as ascorbyl radical (A•), show an stable spectrum, and can be directly detected by EPR at room temperature. Studies included in this work clearly show that this highly sensitive methodology can be successfully applied to biological systems. Exposure of plants to UV-B radiation was studied as a factor of oxidative stress in plants, and the effect on A^• steady state concentration was analyzed. A kinetic analysis was performed considering… More >

Carmona MA¹, E Simonetti^2,3, ME Ravotti¹, MM Sc,iani⁴, AG Luque⁴, NA Formento⁵, FJ Sautua¹

Phyton-International Journal of Experimental Botany, Vol.86, pp. 265-269, 2017, DOI:10.32604/phyton.2017.86.265

Abstract Soybean root and stem rots caused by soil-borne pathogens are diseases commonly found in soybean fields, and one of the most important causes of crop losses. In the present study, the mycelial sensitivity of Fusarium virguliforme, F. tucumaniae, Sclerotinia sclerotiorum and Macrophomina phaseolina was evaluated on potato dextrose agar media (25 mL) supplemented with different concentrations of manganese phosphite (MnPhi) diluted in water (0, 25, 37.5, 50, 100, 200, 300, 400, 500, 800 and 1000 μg/mL). Mycelial growth sensitivity was analyzed using logarithmic linear regression analysis. The MnPhi concentration needed to inhibit 50% of the mycelial growth (IC₅₀) ranged from… More >

Aguirre-Hernández E¹, R San Miguel-Chávez², M Palma Tenango², ME González-Trujano³, E de la Rosa-Manzano⁴, G Sánchez-Ramos⁴, A Mora-Olivo⁴, A Martínez- Palacios⁵, JG Martinez-Ávalos⁴

Phyton-International Journal of Experimental Botany, Vol.86, pp. 46-52, 2017, DOI:10.32604/phyton.2017.86.046

Abstract HPLC analysis of capsaicin and dihydrocapsaicine concentrations obtained from fruits of Capsicum annuum var. glabrisculum, collected from four localities in the state of Tamaulipas, Mexico, was investigated. Selection of localities for this study was carried out considering that 65% of the people living in them gather wild chilli pepper for either autoconsumption or commercial purposes. An ANOVA analysis was carried out for determining capsaicinoids composition variation. Also, a multivariate analysis was carried out using Pearson correlation and principal components analysis to elucidate the influence that environmental factors might have on capsaicinoids concentration. Fruits from the locality El Gavilán had the… More >

D.Taylor¹

Structural Durability & Health Monitoring, Vol.2, No.1, pp. 1-10, 2006, DOI:10.3970/sdhm.2006.002.001

Abstract Current theories of fracture recognize the importance of material length scales, i.e. parameters having the dimensions of length which are included, either explicitly or implicitly, in many methods of fracture prediction. This paper is a review of the development of one particular approach, which we have called the Theory of Critical Distances (TCD). The history of this approach -- which is presented here for the first time - is a story of parallel developments in the areas of fatigue and brittle fracture and in different material fields: metals, polymers, ceramics and composites. A particular milestone in the development of the… More >

Wen JING^1,§, Chuanfen LI^2,3,§, Yingli LU⁴, Lianshi FENG⁴

BIOCELL, Vol.43, No.3, pp. 129-138, 2019, DOI:10.32604/biocell.2019.06087

Abstract This study aimed to investigate the microRNA expression profile and the characteristics of lipid metabolism in the livers of rats undergoing a high-fat diet. Fifty male Sprague-Dawley (SD) rats were divided into a standard chow group (C group, N = 10) and a high-fat diet group (H group, N = 40). After 12 weeks, the rat body weight, body length, fat mass, and serum lipid concentration were measured. The expression profile of microRNAs and the gene and protein expression levels involved in lipid metabolism in rat liver were detected. Body fat and serum lipid concentrations were all significantly higher in… More >

Yu-Cheng Liu, Yin-Sung Hsu, Jin H. Huang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.019.025

Abstract This paper presents the result of a theoretical study on a new fluid density measuring concept which uses the effect of external fluid loading on a vibrating thin plate. The underling physical principle of this concept is that the resonance frequencies of an immersed vibrating plate change with the surface impedance changes caused by the mass density variations of the external fluid. In this paper, the analytical solutions of resonance frequencies with specific gravity are demonstrated by using the finite element simulation, COMSOL. The theoretical analysis presented in this paper shows that the resonance frequencies of an immersed vibrating thin… More >

Paula do Patrocínio Dias, Marcelo Aparecido Chinelatto^*

Journal of Renewable Materials, Vol.7, No.2, pp. 129-138, 2019, DOI:10.32604/jrm.2019.00037

Abstract In this study a low molecular weight triblock copolymer derived from ε-caprolactone and tetrahydrofuran was used as a non-reactive compatibilizer of immiscible PLA/PCL blends. Ternary blends with 0, 1.5 wt%, 3 wt% and 5 wt% copolymer and about 75 wt% PLA were prepared by single screw extrusion and characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile and Izod impact testing. SEM micrographs showed that the size of the dispersed PCL domains was practically constant regardless of copolymer concentration. This result can be explained by the low shear rate employed during processing step and… More >