The availability of calcium in three grasses

1957 ◽  
Vol 49 (4) ◽  
pp. 446-453 ◽  
Author(s):  
R. H. Armstrong ◽  
Brynmor Thomas ◽  
D. G. Armstrong
Keyword(s):  
Oxalic Acid ◽  
Experimental Animal ◽  
Acid Content ◽  
Calcium Content ◽  
Fibre Content ◽  
Total Calcium ◽  
Rye Grass ◽  
Grassland Plants ◽  
Calcium Availability

1. The availability of the calcium in three species of grass has been determined by a slaughter technique, using the rat as the experimental animal.2. The calcium in both timothy and perennial rye-grass was found to be more available than that in cocksfoot, the differences between timothy and cocksfoot, and between perennial rye-grass and cocksfoot being of a significant order.3. The grasses as a whole were found to be inferior to both the legumes and herbs in respect of calcium availability.4. The significance of the high faecal calcium values found in rats receiving the cocksfoot diets has been discussed.5. There was shown to be some indication of inverse relationships between fibre content and calcium availability, and between oxalic acid content and calcium availability.No single one of the nine grassland plants so far investigated has proved to have a calcium availability which, when taken in conjunction with total calcium content, would be in the least likely to induce symptoms of deficiency in an animal fed on that species alone.

The availability of calcium in three herbs of grassland

1953 ◽  
Vol 43 (3) ◽  
pp. 337-342 ◽  
Author(s):  
R. H. Armstrong ◽  
Brynmor Thomas ◽  
K. Horner
Keyword(s):  
Oxalic Acid ◽  
Experimental Animal ◽  
Acid Content ◽  
Fibre Content ◽  
Calcium Balance ◽  
Parallel Methods ◽  
Calcium Availability

1. The availability of the calcium in three common herbs, viz. narrow-leaved plantain, chicory and burnet, has been investigated using the rat as the experimental animal.2. Parallel methods used for the determination of calcium balance involved (a) the analysis of feed, faeces and urine, and (b) carcass analysis.3. The availability of the calcium, while high in all three species, was in the order plantain, chicory and burnet. All differences between means were significant at P = 0·05.4. There was shown to be some evidence of inverse relationships between fibre content and calcium availability, and between oxalic acid content and calcium availability.

scholarly journals Influence of prometryne (Gesagard 50) on pectic substances and calcium contents in the above-ground parts of the field pea (Pisum arvense L.)

2013 ◽  
Vol 37 (2) ◽  
pp. 169-177
Author(s):  
Renata Ciszewska ◽  
Anna Sykut ◽  
Jadwiga Szynal
Keyword(s):  
Weed Control ◽  
Growth And Development ◽  
Plant Cells ◽  
Calcium Content ◽  
Field Pea ◽  
Field Conditions ◽  
Total Calcium ◽  
Pisum Arvense ◽  
Pectic Substances

The content of pectic substances (soluble pectins and fraction of protopectins) and calcium (free and bound) in field pea (<i>Pisum arvense</i> L.) leaves and stems during budding and flowering in field conditions was determined. In this experiment Gesagard 50 (S. A. - 50% prometryne) was applied to the soil in a weed control dose (2 kg/ha). An insignificant decrease of the content of protopectins and total pectins in leaves of the investigated plants (about 3-7% in relation to control) after application of this herbicide was noted, hut analogous changes in all years of the experiment were not observed in field pea stems. The influence of prometryne on the distribution of pectic substances in above-ground parts of the field pea and the degree of protopectins methylation were not corroborated. Neither did the total calcium content in the investigated plants change after application ofthe herbicide. These results show that application of Gesagard 50 in a weed control dose (2 kg/ha) in cultivation of field pea does not evoke changes in the investigated components content which might be of significance in the growth and development of plant cells and immunity reactions of plants.

Effects of E. coli sepsis and myocardial depressant factor on interval-force relations in dog ventricle

1993 ◽  
Vol 264 (5) ◽  
pp. H1402-H1410 ◽  
Author(s):  
P. Jha ◽  
H. Jacobs ◽  
D. Bose ◽  
R. Wang ◽  
J. Yang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Steady State ◽  
Sarcoplasmic Reticulum ◽  
Calcium Metabolism ◽  
Calcium Content ◽  
Left Ventricular ◽  
Muscle Preparation ◽  
E Coli ◽  
Calcium Availability ◽  
Fractional Release

We examined whether depressed left ventricular (LV) contractility during Escherichia coli sepsis in dogs was due to a decrease in the fractional release of calcium from the sarcoplasmic reticulum (SR) or a reduction in calcium content in this organelle. To indirectly assess SR calcium availability in a right ventricular (RV) trabecular muscle preparation, we utilized functional indexes of cellular myocardial calcium metabolism, which included rapid-cooling contracture (RCC), an indicator of SR calcium content, and postrest contraction (PRC), an index of calcium availability from the release compartment of the SR. Measurements were made during steady-state stimulation at 0.5 and 1.5 Hz, during which time rest intervals of 30-240 s were periodically imposed. SR calcium availability was measured in RV trabeculae of dogs subjected to 4 h of E. coli sepsis and was compared with calcium availability measured in nonseptic dogs. We further characterized a filterable cardiodepressant substance (FCS), which has been previously shown to be associated with LV depression in this model, to determine whether it produced changes in calcium metabolism similar to those found in sepsis. The results showed that calcium availability from the SR of septic dogs was not impaired. Furthermore, FCS was found in the 10,000- to 30,000-mol wt fraction of plasma and produced changes in PRC in canine trabeculae that were similar to those produced during sepsis. We conclude that, as assessed by PRC and RCC, SR calcium content and release are not impaired in sepsis.

Calcium fluxes in isolated pancreatic acini: effects of secretagogues

1981 ◽  
Vol 240 (1) ◽  
pp. G38-G49 ◽  
Author(s):  
R. L. Dormer ◽  
J. H. Poulsen ◽  
V. Licko ◽  
J. A. Williams
Keyword(s):  
Time Course ◽  
Calcium Content ◽  
Total Calcium ◽  
Good Correspondence ◽  
Amylase Release ◽  
Pancreatic Acini ◽  
Kinetic Component ◽  
Rapid Drop ◽  
Single Exponential ◽  
Stimulation Of

45Ca2+ exchange and total calcium content were measured in isolated mouse pancreatic acini. 45Ca2+ uptake could be described as the sum of a constant and a single exponential kinetic component; about 60% of total acinar calcium was exchangeable. Stimulation by bethanechol increased 45Ca2+ uptake, but the time course of uptake could be fit only by the addition of a more rapid kinetic component without any change in the total exchangeable Ca2+. 45Ca2+ washout after 1-h loading could be fit as the sum of two exponential components. Stimulation increased the rate of 45Ca2+ washout with the appearance of a third and more rapid kinetic component. There was not, however, a good correspondence between the exponential constants measured in uptake and washout protocols in unstimulated acini. Exponential constants were also affected by the concentration of calcium in the medium, further indicating the presence of nonlinearities in 45Ca2+ exchange. The dose-response relationships were similar for bethanechol stimulation of 45Ca2+ uptake and amylase release, whereas stimulation of 45Ca2+ washout reached a maximum at a higher concentration of bethanechol. Both 45Ca2+ uptake and analytical measurement of total Ca2+ showed a rapid drop in acinar Ca2+ content followed by a gradual reuptake on stimulation by bethanechol. It is concluded that the initial primary effect of secretagogues is to increase Ca2+ efflux, which is interpreted to be the result of release of sequestered calcium into the cytosol.

THE OXALIC ACID CONTENT OF SOME COMMON FOODS

1951 ◽  
Vol 16 (1-6) ◽  
pp. 306-312 ◽  
Author(s):  
JAMES C. ANDREWS ◽  
EDWARD T. VISER
Keyword(s):  
Oxalic Acid ◽  
Acid Content

scholarly journals New Method for Determining the Total Calcium Content of Tissue Applied to Whole Skeletal Muscles from Mice with and Without Calsequestrin Knocked Out

2014 ◽  
Vol 106 (2) ◽  
pp. 731a ◽  
Author(s):  
Sandrine A. Kake-Guena ◽  
Cedric R.H. Lamboley ◽  
Patrice Bouchard ◽  
Jerome Frenette ◽  
Eric Rousseau ◽  
...  
Keyword(s):  
Skeletal Muscles ◽  
Calcium Content ◽  
New Method ◽  
Total Calcium

Nutritional evaluation of meat meals for poultry. IV. Prevention of growth depression from high levels of bone or calcium by vitamin and antibiotic supplementation

1965 ◽  
Vol 16 (3) ◽  
pp. 491 ◽  
Author(s):  
BS Sathe ◽  
GL McClymont
Keyword(s):  
Fatty Acids ◽  
Calcium Carbonate ◽  
Essential Fatty Acids ◽  
Skim Milk ◽  
Calcium Content ◽  
Total Calcium ◽  
Growth Depression ◽  
Nutritional Evaluation ◽  
Meat Meal ◽  
Bone Ash

Experiments were conducted to determine the reason for depressed growth in chickens when high levels of bone, bone ash, or calcium were added to diets based on wheat, skim milk, and soybean and/or meat meal, and containing a basal supplement of vitamins and an antibiotic. The growth depression was not due to energy dilution of the diet, nor to an induced deficiency of essential fatty acids or minerals. The growth rates of pair-fed groups of chickens indicated that about half the growth depression was due to a reduced food intake. Depression of appetite and growth was completely prevented by further vitamin . plus antibiotic supplementation of diets containing added bone, bone ash, or calcium carbonate up to a total calcium content of c. 2.5%, but not when calcium exceeded this level. Additions of either vitamins or antibiotics alone produced responses but were not as effective as in combination.

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