Liming materials. Determination of calcium content and magnesium content. Complexometric method

10.3403/02595861u ◽

2015 ◽

Keyword(s):

Calcium Content ◽

Magnesium Content ◽

Complexometric Method

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An improvement of calcium determination technique in the shell of molluscs

Brazilian Archives of Biology and Technology ◽

10.1590/s1516-89132009000100012 ◽

2009 ◽

Vol 52 (1) ◽

pp. 93-98 ◽

Cited By ~ 7

Author(s):

Cristiane Soído ◽

Maurício Carvalho Vasconcellos ◽

Antônia Gonçalves Diniz ◽

Jairo Pinheiro

Keyword(s):

Hydrogen Peroxide ◽

Nitric Acid ◽

Experimental Model ◽

Calcium Content ◽

Conventional Technique ◽

Organic Substances ◽

Complexometric Method ◽

Wet Weight ◽

Calcium Determination

The complexometric method is usually applied to quantitative calcium determination in different materials; however the application of this method to calcium determination in molluscs shells infers significant interferences to the results. The snail Bradybaena similaris, a terrestrial gastropod, was used as experimental model to the improvement of this method. The shells were calcinated and dissolved in nitric acid, the hydrogen peroxide was also used to clarify the medium after the acid addition. The calcination procedure and the use of nitric acid reduced the significantly the interferences, allowing a major degree of destruction of the organic substances of the shell. The improvement of the calcium determination technique usually employed showed calcium content of 874.24 ± 56.617 mg of CaCO3/g of ash in comparison to the conventional technique that allowed the determination of 607.79 ± 67.751 mg of CaCO3/g of shell, wet weight.

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Seasonal changes in the nutritional status and yielding of Anthurium cultorum Birdsey. Part I. Macroelements

Folia Horticulturae ◽

10.2478/fhort-2013-0128 ◽

2009 ◽

Vol 21 (1) ◽

pp. 81-93

Author(s):

Tomasz Kleiber ◽

Andrzej Komosa ◽

Jolanta Krzyszkowska ◽

Krzysztof Moliński

Keyword(s):

Nutritional Status ◽

Phosphorus Content ◽

Calcium Content ◽

Vegetation Period ◽

Magnesium Content ◽

Winter Period ◽

Summer Period ◽

Phosphorus And Potassium ◽

Drip Fertigation

Abstract The aim of the research, which was carried out in the years 2002 − 2004, was the determination of the natural tendencies in the macroelement nutritional status and in the yielding of the standard cultivars of Anthurium cultorum Birdsey (‘Baron’, ‘Choco’, ‘Midori’, ‘Pistache’, ‘President’, ‘Tropical’ from Anthura B.V., the Netherlands) in the autumn-winter and spring-summer vegetations periods. The anthurium was grown in expanded clay with the use of standard nutrients in a drip fertigation system. It was found that an improvement of light conditions caused a significant increase in plant yielding. During the three years of the study, it was found that an essential influence was exerted by the vegetation period on the amount of phosphorus and potassium in the plants’ leaves. In the spring-summer period, a considerable decrease of phosphorus content in the plants was observed, but at the same time, there was an increase of potassium content. In the springsummer period, plant age affected the phosphorus and calcium content of the plants, while in the autumn-winter period, the phosphorus, potassium and calcium content was affected. A decrease in calcium, nitrogen and magnesium content was found in the spring-summer period, while the content of sulphur tended to increase. The obtained results could be a valuable instrument for the interpretation of index parts of plant analyses for diagnostic purposes.

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VASCULAR CONNECTIVE TISSUE UNDER THE INFLUENCE OF THYROXINE

Acta Endocrinologica ◽

10.1530/acta.0.0360197 ◽

1961 ◽

Vol 36 (2) ◽

pp. 197-211 ◽

Cited By ~ 18

Author(s):

lb Lorenzen

Keyword(s):

Connective Tissue ◽

Vessel Wall ◽

Aortic Wall ◽

Calcium Content ◽

Sodium Sulphate ◽

Collagen Content ◽

Histological Changes ◽

Hexosamine Content ◽

Healing Processes

ABSTRACT Biochemical and histological changes in the aortic wall of rabbits were demonstrated following injection of epinephrine and l-thyroxine during 2 weeks. The widespread gross and microscopic changes were accompanied by an increase in hexosamine content and uptake of 35S labeled sodium sulphate, and an increased calcium content, whereas the collagen content, assessed by determination of hydroxyproline, was reduced. Comparison with the effect of epinephrine injections alone showed that thyroxine intensified the damaging effect of epinephrine on the vessel wall and induced more pronounced mucopolysaccharide changes in the aortic wall, presumably acting as a link in the healing processes.

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