The Mobilization of the Calcium Carbonate Deposits in the Endolymphatic Sacs of Metamorphosing Frogs

1966 ◽  
Vol 45 (2) ◽  
pp. 329-341
Author(s):  
J. B. PILKINGTON ◽  
K. SIMKISS
Keyword(s):  
Calcium Carbonate ◽  
Rana Temporaria ◽  
Morphological Changes ◽  
Environmental Water ◽  
Low Ph ◽  
The Other ◽  
Biochemical Data ◽  
Calcium Salts ◽  
Metamorphic Climax ◽  
Carbonate Deposits

1. Tadpoles of Rana temporaria have been reared in solutions of high and low pH with and without calcium. 2. Methods have been devised for analysing calcium, carbonate and phosphate in individual tadpoles. From these analyses it is possible to determine the distribution of calcium salts between the endolymphatic sacs and the skeleton throughout metamorphosis. 3. A system has been devised for correlating biochemical data with the morphological changes occurring during metamorphosis by means of a scale of ‘developmental days’. 4. The resorption of the endolymphatic deposits is not influenced by the acidity of the environmental solution. 5. Tadpoles reared in solutions containing added calcium had at any one stage in metamorphosis a larger reserve of endolymphatic calcium and a better ossified skeleton than the other tadpoles. 6. During metamorphic climax, when the tadpoles do not feed, the calcareous material in the endolymphatic sac is resorbed to provide calcium for the ossification of the skeleton and to make good any renal loss of calcium. 7. The resorption of endolymphatic calcium carbonate occurs in all tadpoles during metamorphic climax irrespective of the level of calcium in the environmental water. 8. The otoliths do not appear to be resorbed and the spinal portion of the deposits in the endolymphatic sacs may be more labile than those in the cranial regions.

scholarly journals Inhibition of scaling water of Tiznit region by "LEVALL®10".

2019 ◽  
Vol 8 (4) ◽  
pp. 283-289 ◽  
Author(s):  
Said Ben-aazza ◽  
Abdallah Hadfi ◽  
M'bark Belattar ◽  
Said Mohareb ◽  
Naima Hafid ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Water Treatment ◽  
Potable Water ◽  
The Other ◽  
Ecological Effect ◽  
Water Pipes ◽  
Other Hand ◽  
The One ◽  
New Generation ◽  
Carbonate Deposits

Combating the formation of calcium carbonate deposits in potable water pipes presents a challenge for water treatment systems, The use of inhibitors is one of the best techniques to prevent or delay the formation of these deposits. It is therefore essential to find a new generation of scale inhibitors, which is distinguished, on the one hand, by a better inhibiting effectiveness of calcium carbonate, and, on the other hand, by their ecological effect due to the respect of health and environment norms.

scholarly journals Pollution Characteristics, Distribution and Ecological Risk of Potentially Toxic Elements in Soils from an Abandoned Coal Mine Area in Southwestern China

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 330
Author(s):  
Libo Pan ◽  
Xiao Guan ◽  
Bo Liu ◽  
Yanjun Chen ◽  
Ying Pei ◽  
...  
Keyword(s):  
Ecological Risk ◽  
Toxic Elements ◽  
Low Ph ◽  
Potentially Toxic Elements ◽  
Point Sources ◽  
The Other ◽  
Guizhou Province ◽  
Pollution Level ◽  
Agricultural Activity ◽  
Background Values

Acid mine drainage (AMD) from abandoned coal mines can lead to serious environmental problems due to its low pH and high concentrations of potentially toxic elements. In this study, soil pH, sulfur (S) content, and arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), nickel (Ni), zinc (Zn), iron (Fe), manganese (Mn), and mercury (Hg) concentrations were measured in 27 surface soil samples from areas in which coal-mining activities ceased nine years previously in Youyu Catchment, Guizhou Province, China. The soil was acidic, with a mean pH of 5.28. Cadmium was the only element with a mean concentration higher than the national soil quality standard. As, Cd, Cu, Ni, Zn, Mn, Cr, and Fe concentrations were all higher than the background values in Guizhou Province. This was especially true for the Cd, Cu, and Fe concentrations, which were 1.69, 1.95, and 12.18 times their respective background values. The geoaccumulation index of Cd and Fe was present at unpolluted to moderately polluted and heavily polluted levels, respectively, indicating higher pollution levels than for the other elements in the study area. Spatially, significantly high Fe and S concentrations, as well as extremely low pH values, were found in the soils of the AMD sites; however, sites where tributaries merged with the Youyu River (TM) had the highest Cd pollution level. Iron originated mainly from non-point sources (e.g., AMD and coal gangues), while AMD and agricultural activity were the predominant sources of Cd. The results of an eco-risk assessment indicated that Cd levels presented a moderate potential ecological risk, while the other elements all posed a low risk. For the TM sites, the highest eco-risk was for Cd, with levels that could be harmful for aquatic organisms in the wet season, and may endanger human health via the food chain.

Fetuin-A adsorption and stabilization of calcium carbonate nanoparticles in a simulated body fluid

2015 ◽  
Vol 3 (31) ◽  
pp. 6411-6419 ◽  
Author(s):  
Erick S. Vasquez ◽  
Janice L. Cunningham ◽  
Justin B. McMahan ◽  
C. LaShan Simpson ◽  
Keisha B. Walters
Keyword(s):  
Calcium Carbonate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Morphological Changes ◽  
Fetuin A ◽  
Over Time

Fetuin-A adsorbs onto and stabilizes CaCO3, as indicated by chemical and morphological changes. Complexed Fetuin-A/CaCO3 showed decreased size over time in a simulated body fluid indicating potential solubilization of CaCO3.

Limnetic Zooplankton Assemblages in Atlantic Canada with Special Reference to Acidification

1986 ◽  
Vol 43 (2) ◽  
pp. 444-456 ◽  
Author(s):  
J. C. H. Carter ◽  
W. D. Taylor ◽  
R. Chengalath ◽  
D. A. Scruton
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Fish Predation ◽  
Low Ph ◽  
Buffering Capacity ◽  
The Other ◽  
Bay Of Fundy ◽  
Factor Scores ◽  
Multiple Discriminant Analysis ◽  
Biological Factors

Crustacean and rotifer plankton assemblages of 93 lakes in Labrador, 107 in Newfoundland, and 142 in New Brunswick – Nova Scotia were investigated for evidence of correlations with lake morphometric, chemical, or biological factors. Labrador assemblages were almost completely lacking in identifiable structure. Newfoundland species clustered into two groups of different body size, suggesting the influence of fish predation. Only one species in Labrador and Newfoundland was significantly correlated with a derived factor related to lake water buffering capacity. New Brunswick – Nova Scotia species clustered into two groups, one featuring significant positive and the other significant negative correlations with the buffering factor. From this we conclude that acidification is having an impact on the limnetic zooplankton of these two provinces. Multiple discriminant analysis was used to demonstrate that New Brunswick – Nova Scotia lakes differing in their buffering capacity were also distinct in zooplankton composition. Lakes with low factor scores (low pH, alkalinity, and calcium) were mainly located in the Bay of Fundy region; this area has above average fog and precipitation, and lies within the summer air flow carrying pollutants from the south.

Studies on the к-casein complex: II. The isolation of a sialic acid-containing fraction by disrupting the complex at low pH in the presence of sodium chloride

1965 ◽  
Vol 32 (1) ◽  
pp. 57-63 ◽  
Author(s):  
R. Beeby
Keyword(s):  
Sialic Acid ◽  
Sodium Chloride ◽  
Deae Cellulose ◽  
Low Ph ◽  
The Other ◽  
Trichloracetic Acid ◽  
Complex Ii ◽  
Total Sialic Acid

SummaryWhen crude к-casein was precipitated at pH 3 in the presence of 0·4m-NaCl the supernatant contained up to 80% of the total sialic acid but no detectable cystine or cysteine. Two fractions were obtained from this supernatant by chromatography on DEAE cellulose; one containing 4–6% sialic acid and the other only onetenth of this amount.Most of the sialic acid of the sialic acid-rich fraction was soluble in 12% trichloracetic acid following treatment with rennin. It is suggested that the glycopeptide released by the action of the enzyme on casein originates from this fraction.

Crystallization of calcium carbonate under the influences of casein and magnesium ions

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 110362-110366 ◽  
Author(s):  
Ao Zhang ◽  
Hao Xie ◽  
Nian Liu ◽  
Bao-Li Chen ◽  
Hang Ping ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Morphological Changes ◽  
Magnesium Ions

The significant morphological changes of calcium carbonate crystals were investigated and observed in the presence of casein and magnesium ions.

scholarly journals Nutrient accumulation and biomass production of alfafa after soil amendment with silicates

Revista CERES ◽  
2014 ◽  
Vol 61 (3) ◽  
pp. 406-413 ◽  
Author(s):  
Angélica Cristina Fernandes Deus ◽  
Leonardo Theodoro Bull ◽  
Juliano Corulli Corrêa ◽  
Roberto Lyra Villas Boas
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Soil Amendment ◽  
Soil Acidity ◽  
Steel Slag ◽  
The Other ◽  
Chemical Characteristics ◽  
Nutrient Accumulation ◽  
Particle Size Fractions ◽  
Soil Liming

Studies on the use of silicate correctives in agriculture show that they have great potential to improve soil chemical characteristics, however, little information is available on the reactivity rates of their particle-size fractions. This study investigated whether the reactivity rates obtained experimentally could be considered in the calculation of ECC (effective calcium carbonate) for soil liming, promoting adequate development of alfalfa plants. Six treatments were evaluated in the experiment, consisting of two slag types applied in two rates. The experimental ECC was used to calculate one of the rates and the ECC determined in the laboratory was used to calculate the other. Rates of limestone and wollastonite were based on the ECC determined in laboratory. The rates of each soil acidity corretive were calculated to increase the base saturation to 80%. The treatments were applied to a Rhodic Hapludox and an Alfisol Ferrudalfs. The methods for ECC determination established for lime can be applied to steel slag. The application of slag corrected soil acidity with consequent accumulation of Ca, P, and Si in alfalfa, favoring DM production.

scholarly journals CALCIUM SALTS OF AMINO ACIDS FOR THE TREATMENT OF OSTEOPOROSIS IN ANIMALS

2018 ◽  
Vol 54 (3) ◽  
pp. 314-318
Author(s):  
D. V. Lopatik ◽  
U. D. Kovalenko ◽  
Z. I. Kuvaeva ◽  
E. A. Manchik
Keyword(s):  
Amino Acids ◽  
Calcium Carbonate ◽  
Bone Tissue ◽  
Therapeutic Effect ◽  
Test Substance ◽  
Calcium Salts ◽  
Treatment Of Osteoporosis ◽  
Prevention And Treatment ◽  
Regeneration Of Bone Tissue ◽  
Regeneration Of Bone

Results of the study of the drug from calcium salts of amino acids (calcium diglycinate, calcium di-L-prolinate) on the model of osteoporosis in animals are described. The test substance was found to have better therapeutic effect in the regeneration of bone tissue in comparison with the drug containing calcium carbonate. The drug containing calcium salts of glycine and L-proline can be used for prevention and treatment of osteoporosis.

scholarly journals Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)

2013 ◽  
Author(s):  
Patrick De Deckker ◽  
Koen Martens
Keyword(s):  
Adult Stage ◽  
Morphological Changes ◽  
The Other ◽  
Left Valve ◽  
Ventral Region ◽  
Valve Morphology ◽  
Other Hand ◽  
Early Instar ◽  
Juvenile Stages

Ostracods belonging to the genus Bennelongia differ much in valve morphology between adults and juveniles. Adult valves are asymmetrical, characterised by a beak-like feature in the antero-ventral region of the left valve, and, with some notable exceptions, mostly have smooth or weakly-ornamented valves. Juvenile specimens, on the other hand, have valves that are almost symmetrical, with no beak-like feature and are often heavily ornamented.We have examined the last 3 - 4 juvenile stages of 6 Bennelongia species from 5 different lineages, in order to decipher the types of external valve ornamentation and their recurrences during ontogeny and across lineages. It is clear that ornamentation is more prevalent at the early instar stages compared to the last 2 pre-adult stages, and especially when compared to the adult stage itself.We also examined the surprising presence of a calcified inner lamella with a prominent inner list in the pre-adult stages of Bennelongia species, that is usually absent in juveniles of other ostracods, thus questioning if heterochronic processes have provided an intermediate valve morphology between the simple (normal) cypridinid juvenile state and the heavily derived and modified state of adult Bennelongia.We discuss the possible (speculative) functionality of the ornamentation in juveniles.

scholarly journals THE ABSORPTION SPECTRUM OF VISUAL PURPLE

1938 ◽  
Vol 21 (4) ◽  
pp. 411-430 ◽  
Author(s):  
Aurin M. Chase ◽  
Charles Haig
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Light Transmission ◽  
Low Ph ◽  
The Other ◽  
Distilled Water ◽  
Color Purity ◽  
Chemical Combination ◽  
Ph Range ◽  
Sensitive Group

The absorption spectra of visual purple solutions extracted by various means were measured with a sensitive photoelectric spectrophotometer and compared with the classical visual purple absorption spectrum. Hardening the retinas in alum before extraction yielded visual purple solutions of much higher light transmission in the blue and violet, probably because of the removal of light-dispersing substances. Re-extraction indicated that visual purple is more soluble in the extractive than are the other colored retinal components. However, the concentration of the extractive did not affect the color purity of the extraction but did influence the keeping power. This suggests a chemical combination between the extractive and visual purple. The pH of the extractive affected the color purity of the resulting solution. Over the pH range from 5.5 to 10.0, the visual purple color purity was greatest at the low pH. Temperature during extraction was also effective, the color purity being greater the higher the temperature, up to 40°C. Drying and subsequent re-dissolving of visual purple solutions extracted with digitalin freed the solution of some protein impurities and increased its keeping power. Dialysis against distilled water seemed to precipitate visual purple from solution irreversibly. None of the treatments described improved the symmetry of the unbleached visual purple absorption spectrum sufficiently for it to resemble the classical absorption spectrum. Therefore it is very likely that the classical absorption spectrum is that of the light-sensitive group only and that the absorption spectra of our purest unbleached visual purple solutions represent the molecule as a whole.

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