Fertilizers. Extraction of total calcium, total magnesium, total sodium and total sulfur in the forms of sulfates

2015 ◽  
Keyword(s):  
Total Sulfur ◽  
Total Calcium ◽  
Total Magnesium ◽  
Total Sodium

Influence of posture on free calcium and related variables.

1979 ◽  
Vol 25 (10) ◽  
pp. 1766-1769 ◽  
Author(s):  
B W Renoe ◽  
J M McDonald ◽  
J H Ladenson
Keyword(s):  
Total Protein ◽  
Hydrogen Ion ◽  
Free Calcium ◽  
Total Calcium ◽  
Healthy Men ◽  
Supine Posture ◽  
Before And After ◽  
The Subject ◽  
Sodium And Potassium ◽  
Total Magnesium

Abstract We measured free calcium and related variables before and after the subject changed from the upright to the supine posture, doing 15 separate such experiments on 11 healthy men. After such a change, free calcium (1.7 +/- 0.4%), total calcium (4.6 +/- 0.7%), total protein (11.5 +/- 1.4%), albumin (12.2 +/- 2.0%), total magnesium (3.8 +/- 0.9%), and the activity of hydrogen ion (2.9 +/- 1.0%) decreased significantly (values are means +/- SEM), but promptly reverted when three subjects assumed the alternative posture. Changes in lactate values were not rapidly reversible; sodium and potassium showed no significant change. The mechanism of the changes in free calcium is unclear, but they correlated only with the changes in total calcium and were notably less than the changes in total calcium, indicating that posture will have less effect on the interpretation of free calcium values than on values for total calcium.

Ionized and Total Magnesium Levels in Cyclosporin-Treated Renal Transplant Recipients: Relationship with Cholesterol and Cyclosporin Levels

1993 ◽  
Vol 85 (3) ◽  
pp. 315-318 ◽  
Author(s):  
M. S. Markell ◽  
B. T. Altura ◽  
R. L. Barbour ◽  
B. M. Altura
Keyword(s):  
Renal Transplant ◽  
Total Cholesterol ◽  
Trough Level ◽  
Ionized Calcium ◽  
Renal Transplant Recipients ◽  
Total Calcium ◽  
Transplant Recipients ◽  
Ionized Magnesium ◽  
Control Subjects ◽  
Total Magnesium

1. Ionized magnesium, measured using a newly developed ion-selective electrode, total magnesium, and ionized and total calcium were evaluated in 39 stable, long-term, cyclosporin-treated renal transplant recipients and compared with those of age-matched, non-transplanted control subjects. Total cholesterol, cyclosporin trough level, serum creatinine, time after-transplant and the ratio of ionized calcium to ionized magnesium were also measured in renal transplant recipients and the relationships between these variables and ionized and total magnesium were evaluated. 2. Renal transplant recipients exhibited marked deficits in ionized magnesium, with a mean value of 0.54 ±0.01 mmol/l as compared with 0.61 ± 0.006 mmol/l for normal control subjects (P ≦ 0.05), with a more moderate deficit in total magnesium. Values for ionized and total calcium did not differ. By stepwise linear multiple regression analysis, ionized magnesium was significantly related to cyclosporin trough level and total cholesterol but not to serum creatinine, time after transplant or the dose of cyclosporin. Ionized magnesium correlated inversely with cyclosporin trough level and directly with total cholesterol. The ratio of ionized calcium to ionized magnesium was elevated in renal transplant recipients when compared with control subjects and correlated positively with the cyclosporin trough level. 3. Deficits in ionized magnesium are common during the late post-transplant period in cyclosporin-treated renal transplant recipients. Ionized magnesium may be a more sensitive clinical parameter than total magnesium in this population, in whom total magnesium may be only mildly decreased in the setting of a severe deficit in ionized magnesium. 4. Ionized magnesium correlates with the cyclosporin level. Renal transplant recipients with high cyclosporin levels demonstrate the most severe deficits in ionized magnesium, and this finding could contribute to cyclosporin-induced hypertension and nephrotoxicity. The direct correlation between ionized magnesium and total cholesterol may result from a ‘masked magnesium deficiency’, as has been suggested in animal models, and requires further study. 5. Accelerated atherosclerosis observed after renal transplantation may relate to alterations in ionized magnesium and elevated ratios of ionized calcium to ionized magnesium, which are associated with atherogenesis in other models.

Effect of salinity treatments on nutrient concentration in zucchini plants (Cucurbita pepo L. var. Moschata)

1997 ◽  
Vol 37 (5) ◽  
pp. 605 ◽  
Author(s):  
G. Villora ◽  
G. Pulgar ◽  
D. A. Moreno ◽  
L. Romero
Keyword(s):  
Cucurbita Pepo ◽  
Sodium Concentration ◽  
Growth Cycle ◽  
Total Calcium ◽  
Sodium Potassium ◽  
Potassium Sodium ◽  
Fruit Skin ◽  
Calcium And Magnesium ◽  
Sodium And Potassium ◽  
Total Sodium

Summary. Zucchini plants (Cucurbita pepo L. var. Moschata) grown in artificial soil under greenhouse conditions were supplied with differing amounts of NaCl (0, 30, 60 or 120 g/m2 ) during the entire growth cycle. The concentrations of both total and soluble sodium, potassium, calcium and magnesium in leaves as well as fruit (skin and pulp) were measured. Total sodium concentration in leaves increased with higher levels of applied NaCl, while in the fruit this trend was the reverse. As soil salinity increased, there was a corresponding decrease in the total and soluble potassium content of leaves but an increase in total and soluble concentrations of potassium in the fruit. The sum of both total and soluble sodium and potassium in the leaves generally increased with higher levels of applied NaCl, whereas the potassium : sodium ratio fell as salinity rose. In fruit, the sum of total and soluble sodium and potassium, as well as the potassium : sodium ratio, increased as the concentration of applied NaCl increased. The foliar levels of calcium and magnesium (except for total calcium readings) followed similar trends in relation to NaCl treatments as for sodium, while the response of calcium and magnesium in fruit tissues to the treatments was similar to that of potassium. Total calcium and magnesium levels were higher in leaves, with similar high levels in fruit tissues, these levels were higher when compared with other plants grown under saline conditions.

Sign in / Sign up

Export Citation Format

Share Document