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Registros recuperados: 16
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A model to explain high values of pH in an alkali sodic soil Scientia Agricola
Guerrero-Alves,José; Pla-Sentís,Ildefonso; Camacho,Rafael.
For alkali sodic soils (pH>8.5), the "hydrolysis of exchangeable sodium" has been used as a possible explanation for the alkalinity production and rise in pH of these soils. As an alternative to this hypothesis, a model was developed to simulate and to explain that the alkalinity production and rise in pH is possible in a soil that accumulates alkaline sodium salts and CaCO3. Several simulations were performed by using different combinations of CO2 partial pressures (P), presence or absence of MgCO3, along with experimental values of exchangeable sodium percentage (ESP) and ion concentrations in saturation extracts from an alkali sodic soil (named Pantanal). A hypothetical system with similar conditions to the Pantanal soil but with a Gapon selectivity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gapon selectivity coefficients; Calcium carbonate; Sodium bicarbonate; Alkaline hydrolysis.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400021
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Application of lime, phosphogypsum and fertilization rates affect soil fertility and common bean development in no-tillage system in a Cerrado Oxisol. Repositório Alice
CARVALHO, M. da C. S.; NASCENTE, A. S..
There is a lack of information about the effects of interactions among lime, phosphogypsum (PG) and fertilization on soil fertility and their effects on common bean yields in the tropics. This study aimed to determine the effects of annual application of PG and limestone and rates of fertilization on the chemical attributes of soil, fertilization efficiency , yield components and the grain yield of the common bean. The study was performed for three growing seasons in an acidic Oxisol. The experimental design was randomized blocks in a 4x4 factorial scheme. The treatments consisted of lime, lime + PG, PG, and control (without corrective application) with four fertilization rates. In an acidic and low-fertility Cerrado soil, limestone or limestone + PG...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fosfogesso; Feijão; Phaseolus Vulgaris; Acidez do Solo; Calagem; Fertilidade do Solo; Fertilizante; Plantio Direto; Cerrado; No-tillage; Beans; Soil fertility; Phosphogypsum; Liming; Calcium carbonate; Acid soils.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095846
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Application of lime, phosphogypsum and fertilization rates affect soil fertility and common bean development in no-tillage system in a Cerrado Oxisol Agronomy
Carvalho, Maria da Conceição Santana; Nascente, Adriano Stephan.
There is a lack of information about the effects of interactions among lime, phosphogypsum (PG) and fertilization on soil fertility and their effects on common bean yields in the tropics. This study aimed to determine the effects of annual application of PG and limestone and rates of fertilization on the chemical attributes of soil, fertilization efficiency, yield components and the grain yield of the common bean. The study was performed for three growing seasons in an acidic Oxisol. The experimental design was randomized blocks in a 4x4 factorial scheme. The treatments consisted of lime, lime + PG, PG, and control (without corrective application) with four fertilization rates. In an acidic and low-fertility Cerrado soil, limestone or limestone + PG...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Soil acidity; Calcium carbonate; Liming; Phosphogypsum.; Fertilidade do solo; Nutrição de plantas; Fitotecnia.
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39322
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Application of lime, phosphogypsum and fertilization rates affect soil fertility and common bean development in no-tillage system in a Cerrado Oxisol Agronomy
Carvalho, Maria da Conceição Santana; Nascente, Adriano Stephan.
There is a lack of information about the effects of interactions among lime, phosphogypsum (PG) and fertilization on soil fertility and their effects on common bean yields in the tropics. This study aimed to determine the effects of annual application of PG and limestone and rates of fertilization on the chemical attributes of soil, fertilization efficiency, yield components and the grain yield of the common bean. The study was performed for three growing seasons in an acidic Oxisol. The experimental design was randomized blocks in a 4x4 factorial scheme. The treatments consisted of lime, lime + PG, PG, and control (without corrective application) with four fertilization rates. In an acidic and low-fertility Cerrado soil, limestone or limestone + PG...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ciências agrárias; Solos e nutrição de plantas Phaseolus vulgaris; Soil acidity; Calcium carbonate; Liming; Phosphogypsum. fertilidade do solo; Nutrição de plantas; Fitotecnia.
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39322
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Aspirin plus calcium supplementation to prevent superimposed preeclampsia: a randomized trial BJMBR
Souza,E.V.; Torloni,M.R.; Atallah,A.N.; dos Santos,G.M.S.; Kulay Jr,L.; Sass,N..
Preeclampsia is an important cause of maternal and perinatal morbidity and mortality. Previous studies have tested calcium supplementation and aspirin separately to reduce the incidence of preeclampsia but not the effects of combined supplementation. The objective of this study was to investigate the effectiveness of aspirin combined with calcium supplementation to prevent preeclampsia in women with chronic hypertension. A double-blind, placebo-controlled randomized clinical trial was carried out at the antenatal clinic of a large university hospital in São Paulo, SP, Brazil. A total of 49 women with chronic hypertension and abnormal uterine artery Doppler at 20-27 weeks gestation were randomly assigned to receive placebo (N = 26) or 100 mg aspirin plus 2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Preeclampsia; Hypertension; Ultrasonography; Doppler; Calcium carbonate; Aspirin.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000500419
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Determination of reactivity rates of silicate particle-size fractions Repositório Alice
DEUS, A. C. F.; BÜLL, L. T.; CORREA, J. C.; VILLAS BOAS, R. L..
The efficiency of sources used for soil acidity correction depends on reactivity rate (RR) and neutralization power (NP), indicated by effective calcium carbonate (ECC). Few studies establish relative efficiency of reactivity (RER) for silicate particle-size fractions, therefore, the RER applied for lime are used. This study aimed to evaluate the reactivity of silicate materials affected by particle size throughout incubation periods in comparison to lime, and to calculate the RER for silicate particle-size fractions. Six correction sources were evaluated: three slags from distinct origins,dolomitic and calcitic lime separated into four particle-size fractions (2, 0.84, 0.30 and <0.30-mm sieves), and wollastonite, as an additional treatment. The...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carbonato de cálcio; Taxa de reatividade; Neutralização do solo; Granulometria; Solo ácido; Acid soils; Calcium carbonate.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1003337
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Efeito de adição de diferentes sais de cálcio nas características da massa e na elaboração de pão francês. Repositório Alice
KAJISHIMA, S.; PUMAR, M.; GERMANI, R..
O objetivo deste trabalho foi estudar os efeitos da adição do sulfato de cálcio, carbonato de cálcio e fosfato de cálcio dibásico nas características físicas e reológicas da farinha de trigo e na qualidade de pão francês. Utilizou-se a quantidade de sais de cálcio que correspondesse a 100% da IDR de adulto por 100g de pão. Na farinha foram realizadas análises de cor, teor de glúten, farinografia, alveografia e extensigrafia. O pão francês elaborado foi analisado quanto a seu volume específico e conceito global. O enriquecimento com cálcio melhorou a cor da farinha e os resultados satisfatórios obtidos na reologia das massas e com os pães mostraram que se pode utilizar qualquer uma das três fontes para se elaborar pão enriquecido com cálcio.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pão francês; French bread; Flour enrichment; Enriquecimento de farinha; Carbonato de cálcio; Sulfato de Cálcio; Fosfato de Cálcio; Calcium carbonate; Dicalcium phosphate; Calcium sulfate.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122639
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Effect of culture medium on biocalcification by Pseudomonas Putida, Lysinibacillus Sphaericus and Bacillus Subtilis BJM
Shirakawa,Márcia Aiko; Cincotto,Maria Alba; Atencio,Daniel; Gaylarde,Christine C.; John,Vanderley M..
The objective of this study is to investigate the efficiency of calcium carbonate bioprecipitation by Lysinibacillus sphaericus, Bacillus subtilis and Pseudomonas putida, obtained from the Coleção de Culturas do Instituto Nacional de Controle de Qualidade em Saúde (INCQS), as a first step in determining their potential to protect building materials against water uptake. Two culture media were studied: modified B4 containing calcium acetate and 295 with calcium chloride. Calcium consumption in the two media after incubation with and without the bacterial inoculum was determined by atomic absorption analysis. Modified B4 gave the best results and in this medium Pseudomonas putida INQCS 113 produced the highest calcium carbonate precipitation, followed by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pseudomonas putida; Lysinibacillus sphaericus; Bacillus subtilis; Calcium carbonate; Biocalcification.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000200014
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High dietary calcium decreases blood pressure in normotensive rats BJMBR
Buassi,N..
This study evaluates the influence of different concentrations of calcium on blood pressure of normotensive rats. Four groups of Wistar rats (A, B, C and D) had free access to modified isocaloric and isoproteic diets containing 0.2, 0.5, 2 and 4 g% calcium as calcium carbonate for a period of 30 days. Systolic and diastolic arterial blood pressures were monitored in awake rats by the indirect tail cuff method using a Physiograph equipped with transducers and preamplifiers. Body weight and length and food intake were monitored. Under the conditions of the present experiment, the systolic and diastolic arterial blood pressures of group D rats fed a diet containing 4 g% calcium were significantly (P&lt;0.05) lower compared to rats of the other groups.
Tipo: Info:eu-repo/semantics/other Palavras-chave: Calcium carbonate; Arterial blood pressure; Dietary calcium.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000800011
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Mineral phase in shell repair of Manila clam Venerupis philippinarum affected by brown ring disease ArchiMer
Trinkler, Nolwenn; Bardeau, Jean-francois; Marin, Frederic; Labonne, Maylis; Jolivet, Aurelie; Crassous, Philippe; Paillard, Christine.
The mineral phase of shell repair in the Manila clam Venerupis philippinarum affected by brown ring disease (BRD) was characterised at various scales and at various stages of shell repair by confocal Raman microspectrometry and scanning electron microscopy. Spherulitic and quadrangular aragonite microstructures associated with polyene pigments were clearly observed. Von Kossa staining showed that at the beginning of shell repair, hemocytes are filled with insoluble calcium carbonate salts in all fluids and then are transported toward the extrapallial fluids and the repair sites. Our analyses suggest that after a Vibrio tapetis attack and BRD deposit some clams rapidly cover the deposit, resulting in a modification in the microstructure, which could be...
Tipo: Text Palavras-chave: Aragonite; Hemocytes; Shell microstructure; Calcium carbonate; Biomineralization; Mollusc; Raman microspectrometry; Scanning electron microscopy.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00029/14065/11301.pdf
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Nutritive value of sugarcane silage treated with chemical additives Scientia Agricola
Santos,Mateus Castilho; Nussio,Luiz Gustavo; Mourão,Gerson Barreto; Schmidt,Patrick; Mari,Lucas José; Ribeiro,José Leonardo; Queiroz,Oscar Cézar Müller; Zopollatto,Maity; Sousa,Daniel de Paula; Sarturi,Jhones Onorino; Toledo Filho,Sérgio Gil de.
The use of ensiled sugarcane has been increased lately in Brazil due to the benefits that this technique represents. The objective of this study was to evaluate the effects of chemical additives on the nutritive value of sugarcane silages. The trial was carried out in a completely randomized experimental design with four replicates per treatment. The following additives were applied onto the fresh forage before ensiling: L. buchneri, lime or limestone, 1.0 and 1.5% (wet basis) each, and gypsum 1.0% (wet basis), all of them diluted into 40 L of water per ton of fresh weight of forage. The analyzed variables were: ash, crude protein, neutral detergent fiber, acid detergent fiber and organic and dry matter digestibility. The addition of lime or limestone...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcium carbonate; Calcium oxide; Calcium sulfate.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200003
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Physicochemical study of CaCO3 from egg shells Ciênc. Tecnol. Aliment.
Murakami,Fabio Seigi; Rodrigues,Patrik Oening; Campos,Célia Maria Teixeira de; Silva,Marcos Antônio Segatto.
Calcium carbonate, a pharmaceutical excipient, is widely used as diluent in solid dosage forms. It is also used as a base for medicinal and dental preparations, a buffering and dissolution aid for dispersible tablets, a food additive and a calcium supplement. Egg shells are a rich source of mineral salts, mainly calcium carbonate, which corresponds to about 94% of the shell. Layer farms produce large amounts of shells, whose final disposal poses a challenge from the environmental standpoint. This work was designed to evaluate the physicochemical and thermal properties of calcium carbonate obtained from egg shells. The findings indicated that calcium carbonate from egg shells can be used as an alternative pharmaceutical excipient.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Thermal analysis; X-ray powder diffraction; Egg shells; Calcium carbonate.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000300035
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Shallow rocky bottom benthic assemblages as calcium carbonate producers in the Alboran Sea (southwestern Mediterranean) ArchiMer
Cebrian, E; Ballesteros, E; Canals, M.
Zonation patterns and species composition of the different assemblages encountered along the bathymetric axis are considered in order to quantify the biomass and calcium carbonate content of communities thriving in rocky bottoms of La Herradura (southwestern Mediterranean) between 0 and 50 m depth. Algal biomass is lower but total biomass is slightly higher to values recorded in other Mediterranean areas due to the high biomass of suspension feeders. Since most of the animals and algae with high biomass have calcareous skeletons, the calcimass is rather high (1 100 to 2400 g . CaCO3.m(-2)) when compared to other temperate and Mediterranean sites. A tentative estimate of yearly carbonate production yields 1 000 g . CaCO3.m(-2).y(-1) for the rocky bottoms of...
Tipo: Text Palavras-chave: Carbonate; Fonds rocheux; Communautés benthiques; Production; Mer Méditerranée; Calcium carbonate; Rocky bottoms; Benthic assemblages; Production; Mediterranean Sea.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00324/43565/44062.pdf
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Shell repair process in the green ormer Haliotis tuberculata: A histological and microstructural study ArchiMer
Fleury, C; Marin, F; Marie, B; Luquet, G; Thomas, J; Josse, C; Serpentini, A; Lebel, J.
In the present paper, juvenile and adult shells of the green ormer Haliotis tuberculata ('Oreille de Saint-Pierre') were perforated in a zone close to the shell edge and the shell repair process was followed at two levels: (1) by observing the histology of the calcifying mantle in the repair zone and (2) by analyzing with SEM the microstructure of the shell repair zone. Histological data clearly show the presence of calcium carbonate granules into the connective tissues, but not in the epithelial cells. This suggests that calcium carbonate granules are synthesized by sub-epithelial cells and actively transported through the epithelium to the repair zone, via a process which may be similar to that described by Mount et al. [Mount, A.S., Wheeler, A.P.,...
Tipo: Text Palavras-chave: Microstructure; Mantle epithelium; Biomineralization; Calcium carbonate; Shell repair; Gastropod.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/2008/publication-4377.pdf
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Soil phosphorus availability and dry bean yield as affected by the application of liquid calcium carbonate micron particles on the furrow. Repositório Alice
NASCENTE, A. S.; COBUCCI, T..
The application of calcium carbonate micron particles in the planting furrow, because of the reduced particle size may favor a faster reaction in the soil and could provide increased pH and P availability for plants such as dry bean (Phaseolus vulgaris L.), potentially increasing yield. A field experiment was conducted for two consecutive years with the objective to evaluate the effect of the liquid calcium carbonate micron particle application in the planting furrow on soil properties (Ph, P, Ca, K and Al content and V) and on the yield components, grain yield, and concentration and content of P in dry bean. The experimental design was a randomized complete block scheme. The treatments consisted of six rates of calcium carbonate micron particles, that is,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Faster soil reaction; Feijão; Phaseolus vulgaris; Cerrado; Plantio direto; Calagem; Phaseolus vulgaris; Liming; No-tillage; Soil nutrients; Calcium carbonate.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1014490
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ผลของสารพอกและวัสดุประสานต่างชนิดกัน ต่อคุณภาพเมล็ดพันธุ์ข้าวโพดไร่ขนาดเล็ก Thai Agricultural
Nongnuch Saenghin; Boonmee Siri.
In commercial corn production, small seed size is discarded from the seed lot and used as the animal feed, resulting in less profit to the seed industry. Therefore, the objective of this research was to increase seed size by seed pelleting methods. In this study, the types of filler pelleting materials and ratio of binder materials were investigated. The experiment was conducted at Seed Quality Test Laboratory of Seed Processing Plant, Faculty of Agriculture, Khon Kaen University. Small seed size of hybrid corn that retained on grade 14/64” diameter sieve perforations were pelleted with seven different types and ratios of fillers (vermiculite, bentonite, pumice, calcium sulphate, calcium carbonate, charcoal and coconut) with four different types of binders...
Tipo: PhysicalObject Palavras-chave: Corn seed; Seed pelleting; Vermiculite; Bentonite; Pumice; Calcium sulphate; Calcium carbonate; Charcoal; Coconut; Binde; Hydroxypropyl methylcellulose; HPMC; Gum arabic; Carboxymethyl cellulose; CMC power; Methyl cellulose; Seed size; Seed quality; Seed enhancement; Germination percentage; Seed vigour; เมล็ดพันธุ์ข้าวโพด; การพอกเมล็ดพันธุ์; สารพอก; วัสดุประสาน; เทคโนโลยีเมล็ดพันธุ์; การยกระดับคุณภาพเมล็ดพันธุ์; อัตราการงอกของเมล็ด; ความแข็งแรงของเมล็ด.
Ano: 2013 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5727
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