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Search Results: 1 - 10 of 6791 matches for " Physiological effects. "
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Promo??o do crescimento radicular de plantulas de tomateiro por substancias húmicas isoladas de turfeiras
Silva, Alexandre Christofaro;Canellas, Luciano Pasqualoto;Olivares, Fábio Lopes;Dobbss, Leonardo Barros;Aguiar, Natalia Oliveira;Frade, Daniele ?ngela Rossinol;Rezende, Carlos Eduardo;Peres, Lázaro Eustáquio Pereira;
Revista Brasileira de Ciência do Solo , 2011, DOI: 10.1590/S0100-06832011000500015
Abstract: peats are an important reserve of humified carbon in terrestrial ecosystems. the interest in the use of humic substances as plant growth promoters is continuously increasing. the objective of this study was to evaluate the bioactivity of alkaline soluble humic substances (hs), humic (ha) and fulvic acids (fa) isolated from peats with different decomposition stages of organic matter (sapric, fibric and hemic) in the serra do espinha?o meridional, state of minas gerais. dose-response curves were established for the number of lateral roots growing from the main plant axis of tomato seedlings. the bioactivity of ha was greatest (highest response in lateral roots at lowest concentration) while fa did not intensify root growth. both hs and ha stimulated root hair formation. at low concentrations, hs and ha induced root hair formation near the root cap, a typical hormonal imbalance effect in plants. transgenic tomato with reporter gene dr5::gus allowed the observation that the auxin-related signalling pathway was involved in root growth promotion by ha.
Physiological effects in aromatherapy
Tapanee Hongratanaworakit
Songklanakarin Journal of Science and Technology , 2004,
Abstract: The effects of aromas on humans are divided into physiological and psychological effects. The physiological effect acts directly on the physical organism, the psychological effect acts via the sense of smell or olfactory system, which in turn may cause a physiological effect. This paper reviews on the physiological effects which are used for the evaluation of the effects of aromas. Physiological parameters, i.e. heart rate blood pressure, electrodermal activity, electroencephalogram, slow potential brain waves (contingent negativevariation), and eye blink rate or pupil functions, are used as indices for the measurement of the aroma effects
Nano-Ferric Oxide Promotes Watermelon Growth  [PDF]
Meng Wang, Xiaoping Liu, Jing Hu, Junli Li, Jin Huang
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2015, DOI: 10.4236/jbnb.2015.63016
Abstract: With the rapid growing of nanotechnology, the effects of nanomaterials released into the environment on plants have drawn more and more attention. Iron is an element essential for plant growth and development. Iron is involved in chlorophyll formation; iron deficiency will cause a plant disorder known as chlorosis. However, whether iron in nano-ferric oxide can be absorbed by plants were rarely concerned. Nano-ferric oxide might promote the growth and development of plants in a suitable concentration. An experiment was designed to evaluate whether nano-ferric oxide can be used to treat chlorosis and the physiological changes of plants in nano-ferric oxide environment. Watermelon was chosen as the experimental plant. Seedlings of watermelon plants were grown in full nutrient solution without iron for 2 weeks until the leaves got yellow. Then the seedlings were treated with different concentrations of nano-ferric oxide (0, 20, 50, 100 mg/L) and 50 mmol/L of EDTA-Fe(II) for a month. The control group seedlings were still grown in full nutrient solution without any iron. Indicators such as activity of antioxidase like superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) and content of malondialdehyde (MDA) and soluble protein were studied to measure the physiological effects nano-ferric oxide might have on watermelon. It was observed that the leaves reverted green. Experimental data showed that watermelon absorbed iron from nano-ferric oxide, and nano-ferric oxide promoted watermelon growth in some ways in a suitable concentration.
Potential of Tannnins: A Review
Archana A. Bele,Varsha M. Jadhav,V.J. Kadam
Asian Journal of Plant Sciences , 2010,
Abstract: Traditional systems of medicine like ayurvedic system have major treatment across globe. Tannins play an important role and has wide applications. Tanninsare water-soluble polyphenols that are present in many plant foods. They have been reported to be responsible for decreases in feed intake, growth rate, feed efficiency, net metabolizable energy and protein digestibility in experimental animals. Therefore, foods rich in tannins are considered to be of low nutritional value. However, recent findings indicate that the major effect of tannins was not due to their inhibition on food consumption or digestion but rather the decreased efficiency in converting the absorbed nutrients to new body substances. The anticarcinogenic and antimutagenic potentials of tannins may be related to their antioxidative property, which is important in protecting cellular oxidative damage, including lipid peroxidaton. The antimicrobial activities of tannins are well documented. The growth of many fungi, yeasts, bacteria and viruses was inhibited by tannins. We have also found that tannic acid and propyl gallate, but not gallic acid, were inhibitory to foodborne bacteria, aquatic bacteria and off-flavor-producing microorganisms. Their antimicrobial properties seemed to be associated with the hydrolysis of ester linkage between gallic acid and polyols hydrolyzed after ripening of many edible fruits. Tannins in these fruits thus serve as a natural defense mechanism against microbial infections. Tannins have also been reported to exert other physiological effects, such as to accelerate blood clotting, reduce blood pressure, decrease the serum lipid level, produce liver necrosis and modulate immunoresponses.
Antidepressant behavioral effects of duloxetine and fluoxetine in the rat forced swimming test
Ciulla, Leandro;Menezes, Honório Sampaio;Bueno, Bárbara Beatriz Moreira;Schuh, Alexandre;Alves, Rafael José Vargas;Abegg, Milena Pacheco;
Acta Cirurgica Brasileira , 2007, DOI: 10.1590/S0102-86502007000500005
Abstract: purpose: to compare the effects of the antidepressant drugs duloxetine and fluoxetine on depressive behaviors in rodents. methods: eighteen male wistar rats were given systemic injections of duloxetine, fluoxetine, or saline prior to a forced swimming test (fst). immobility and number of stops were measured. results: rats given injections of fluoxetine displayed significantly less immobility (p = 0.02) and fewer stops than the control group (p = 0.003). duloxetine significanlty reduced the number of stops (p = 0.003), but did not effect immobility (p = 0.48). conclusion: duloxetine and fluoxetine reduced depressive behaviors in the forced fst. however, our findings suggest that fluoxetine is more effective than duloxetine.
Antidepressant behavioral effects of duloxetine and amitriptyline in the rat forced swimming test
Menezes, Honório Sampaio;Bueno, Bárbara Beatriz Moreira;Ciulla, Leandro;Schuh, Alexandre;Luz, Fernanda de Freitas;Alves, Rafael José Vargas;Abegg, Milena Pacheco;Cirino, Sílvia Letícia Merceo Bacchi;
Acta Cirurgica Brasileira , 2008, DOI: 10.1590/S0102-86502008000500010
Abstract: purpose: to compare the effects of the antidepressant drugs duloxetine and amitriptyline on depressive behaviors in rats. methods: fifteen male wistar rats were given systemic injections of duloxetine, amitriptyline or saline prior to a forced swimming test (fst). immobility and number of stops were measured. data were analyzed by one-way anova and kruskall-wallis. results: rats given injections of duloxetine displayed fewer stops than the amitriptyline and control group (p< 0.05). the control group and amitriptyline showed no difference (p=0.8). conclusion: duloxetine reduced depressive behaviors in the forced swimming test been more effective than amitriptyline.
Estímulo no crescimento e na hidrólise de ATP em raízes de alface tratadas com humatos de vermicomposto: I - efeito da concentra??o
Rodda, Maria Rita Cardoso;Canellas, Luciano Paqualotto;Fa?anha, Arnoldo Rocha;Zandonadi, Daniel Basílio;Guerra, José Guilherme Marinho;Almeida, Dejair Lopes de;Santos, Gabriel de Araújo;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000400005
Abstract: vermicomposts present a high content of humic substances and their effects on soil properties are well-documented. however, direct effects of humic substances on plant metabolism are less known. the aim of this work was to evaluate the use of humates isolated from cattle manure vermicompost with 0.1 mol l-1 koh on root growth and atp metabolism of lettuce seedlings. after germination, lettuce seedlings were treated with different humate concentrations (0 to 100 mg l-1 of c) for 15 days. the root growth and the h+-atpase activity of root cell microsomes isolated by differential centrifugation were evaluated. the humate treatment, at the concentration of 25 mg l-1 of c, increased fresh and dry root mass as well as root area and total length. also there was a large increase in the number of root mitotic sites and emerged lateral roots in addition to a significant increase of microsomal atp hydrolysis. the data suggest that the vermicompost bioactivity could be related, at least in part, to the humate-induced activation of the plant cell h+ pumps, which are responsible for generating the energy for nutrient absorption and cell growth.
Estímulo no crescimento e na hidrólise de ATP em raízes de alface tratadas com humatos de vermicomposto: II - Efeito da fonte de vermicomposto
Rodda, Maria Rita Cardoso;Canellas, Luciano Paqualotto;Fa?anha, Arnoldo Rocha;Zandonadi, Daniel Basílio;Guerra, José Guilherme Marinho;Almeida, Dejair Lopes de;Santos, Gabriel de Araújo;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000400006
Abstract: cattle manure availability is one of the most limiting factors for vermicompost production. the effects of the partial substitution of manure with sugarcane bagasse or residues of gliricidia sepium on the quality of vermicomposts and the bioactivity of their humates were evaluated by analyzing the root growth and h+-atpase activity of lettuce seedling roots. the substitutions of manure by sugar cane bagasse and legume cover crops residues did not affect the chemical properties of humates. humates isolated from the different vermicomposts, however, presented different chemical characteristics, such as acidity and distinct optical properties. humates isolated from manure and manure + bagasse enhanced growth; these are more adequate for use in soluble form. humates isolated from vermicompost with legume substitution were ineffective in promoting lettuce root growth.
Distribui??o de massa molecular de ácidos húmicos e promo??o do crescimento radicular
Aguiar, Natália de Oliveira;Canellas, Luciano Pasqualoto;Dobbss, Leonardo Barros;Zandonadi, Daniel Basílio;Olivares, Fábio Lopes;Fa?anha, Arnoldo Rocha;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000600010
Abstract: humic acids (ha) directly stimulate several physiological processes that promote plant growth, particularly of the root system. knowledge about the chemical nature and the role of ha in the effects observed under biofertilization and biostimulation is essential to develop ha-based biological resources. the aim of this study was to evaluate a possible relationship between the distribution of the apparent molecular weight of ha isolated from vermicompost and the response in root growth promotion. ha sub-fractions were obtained through preparative chromatography by size exclusion using sephadex gel g-50 gel (cge). the preparative process was validated by high-performance size-exclusion chromatography (hpsec). the five sub-fractions were tested at different concentrations (0; 0.0001; 0.001; 0.003; 0.005; and 0.001 mol l-1 c) for their capacity to stimulate root growth of arabidopisis thaliana (ecotype col 4) seedlings. for maize seedlings (zea mays hybrid uenf 506-6) a rate of 0.002 mol l-1 c was used. the quadratic model described the relationship between root growth induction and ha dose in arabidopsis; 0.00511 mol l-1 c was the average inflection point. at the optimum concentration, a significant negative correlation between molecular weight distribution and the number of lateral roots induced in a. thaliana was observed. however, other root traits, e.g., area and length, were not influenced by the apparent molecular weight of fractions. an increase in the number of mitotic and lateral root emission was observed for maize seedlings, both for the treatment with ha as well as with the sub-fractions. the h+-atpase activity of plasma membrane was significantly affected by ha, although differently in the sub-fractions. the stimulating activity of root growth seems to be more related to the chemical structure of humic substances than to the distribution of molecular weight of the humic aggregates.
Pulmonary Functions in Trained and Untrained Wind Instrument Blowers
Mohan Manohar Sagdeo,,*Prashant Devidas Khuje
People's Journal of Scientific Research , 2012,
Abstract: The present cross-sectional study was designed to ascertain whether regular and trained wind instrument blowers develop higher pulmonary functions than untrained or part time blowers. The study included 155 trained & regular blowers (Group A), 100 untrained part-time blowers (Group B) and 100 non-blowers (Group C). They were investigated by a computerized spirometer (RMS medspiror).Group A subjects showed a significantly higher (p<0.001) percentage predicted value for Forced Vital capacity (FVC), Forced expiratory volume in the 1st second (FEV 1 ), Peak Expiratory Flow Rate (PEFR), Maximum Voluntary Ventilation(MVV), Forced Expiratory Flow at 25% & 50% of FVC (FEF25% & FEF50%), Forced Expiratory Flow between 25% & 75%of FVC (FEF 25-75%), FEF50% of FVC, than the other two groups. However, FEV 1/FVC % in group A was not statistically higher than the other two groups (p=0.3699). Thus, regular training of wind instrument blowing increases the pulmonary functions which may be a physiological advantage of blowing.
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