scholarly journals EVALUATION OF EGGSHELL DERIVED HYDROXYAPATITE AS A BONE REGENERATIVE MATERIAL IN THE TREATMENT OF INTRABONY OSSEOUS DEFECTS - CLINICAL AND RADIOGRAPHIC ASSESSMENT

2021 ◽  
Vol 9 (08) ◽  
pp. 887-895
Author(s):  
Garima Tiwari ◽  
K.T Chandrashekar ◽  
Rohit Mishra ◽  
Chirag S. Jaiswal ◽  
Ashima Trivedi ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Treatment Cost ◽  
Radiographic Assessment ◽  
Environment Friendly ◽  
Osseous Defects

Eggshell contains 98.2%calcium carbonate and can be transformed into hydroxyapatite which is an environment friendly process and can be used as bone regenerative grafts which not only reduces the treatment cost but also high in biosafety.

scholarly journals Synthesis and properties of a high-performance environment-friendly micro–nano filtration reducer

RSC Advances ◽  
2020 ◽  
Vol 10 (70) ◽  
pp. 43204-43212
Author(s):  
Yanling Wang ◽  
Baoyang Jiang ◽  
Jincheng Lan ◽  
Ning Xu ◽  
Jinsheng Sun ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Graft Copolymer ◽  
High Performance ◽  
Research Study ◽  
Hydroxyethyl Cellulose ◽  
Environment Friendly ◽  
Hydrophobically Associating ◽  
Nano Filtration

In this research study, we modified hydroxyethyl cellulose to obtain hydrophobically associating hydroxyethyl cellulose, and grafted it onto the surface of nano-calcium carbonate to obtain a graft copolymer.

Bare and polyelectrolyte-coated calcium carbonate particles for seawater uranium extraction: an eco-friendly alternative

2020 ◽  
Vol 4 (10) ◽  
pp. 5301-5312
Author(s):  
Jérémie Courtois ◽  
Bin Wang ◽  
Isaac N. Abonee ◽  
Xiong Kun ◽  
Qiang Tian ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Environment Friendly ◽  
Uranium Extraction

Bare and polyelectrolyte-coated calcium carbonate particles are inexpensive and environment-friendly seawater uranium extractants. Pure CaCO3 has uranium self-release ability.

Environment-friendly preparation of porous graphite-phase polymeric carbon nitride using calcium carbonate as templates, and enhanced photoelectrochemical activity

2015 ◽  
Vol 3 (9) ◽  
pp. 5126-5131 ◽  
Author(s):  
Jianhai Wang ◽  
Cheng Zhang ◽  
Yanfei Shen ◽  
Zhixin Zhou ◽  
Jiachao Yu ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Silica Nanoparticles ◽  
Porous Carbon ◽  
Carbon Nitride ◽  
Photoelectrochemical Activity ◽  
Graphite Phase ◽  
Environment Friendly ◽  
Porous Graphite ◽  
Polymeric Carbon

Superior to silica nanoparticles, the easily accessible and removable CaCO3 particles produced porous carbon nitride with photocurrents 7.5-times that of the bulk one.

scholarly journals Effect of Strength Enhancement of Soil Treated with Environment-Friendly Calcium Carbonate Powder

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Kyungho Park ◽  
Sangju Jun ◽  
Daehyeon Kim
Keyword(s):  
Calcium Carbonate ◽  
Xrd Analysis ◽  
Uniaxial Compression Strength ◽  
Environment Friendly ◽  
Carbonate Cement ◽  
Strength Enhancement ◽  
Curing Period ◽  
Different Types ◽  
Increased Strength ◽  
Strength Improvement

This study aims to investigate the effects of the strength improvement of soft ground (sand) by producing calcium carbonate powder through microbial reactions. To analyze the cementation effect of calcium carbonate produced through microbial reaction for different weight ratios, four different types of specimens (untreated, calcium carbonate, cement, and calcium carbonate + cement) with different weight ratios (2%, 4%, 6%, and 8%) were produced and cured for a period of 3 days, 7 days, 14 days, 21 days, and 28 days to test them. The uniaxial compression strength of specimens was measured, and the components in the specimen depending on the curing period were analyzed by means of XRD analysis. The result revealed that higher weight ratios and longer curing period contributed to increased strength of calcium carbonate, cement, and calcium carbonate + cement specimens. The calcium carbonate and the calcium carbonate + cement specimens in the same condition showed the tendency of decreased strength approximately 3 times and two times in comparison with the 8% cement specimens cured for 28 days, but the tendency of increased strength was approximately 4 times and 6 times in comparison with the untreated specimen.

A TEM study of the microstructure of avian eggshells

1992 ◽  
Vol 50 (2) ◽  
pp. 1102-1103
Author(s):  
S. Q. Xiao ◽  
S. Baden ◽  
A. H. Heuer
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Nucleation And Growth ◽  
Growth Mechanisms ◽  
Shell Surface ◽  
Thin Sections ◽  
Polycrystalline Metals ◽  
Transmission Electron ◽  
Nucleation And Growth Mechanisms

The avian eggshell is one of the most rapidly mineralizing biological systems known. In situ, 5g of calcium carbonate are crystallized in less than 20 hrs to fabricate the shell. Although there have been much work about the formation of eggshells, controversy about the nucleation and growth mechanisms of the calcite crystals, and their texture in the eggshell, still remain unclear. In this report the microstructure and microchemistry of avian eggshells have been analyzed using transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS).Fresh white and dry brown eggshells were broken and fixed in Karnosky's fixative (kaltitanden) for 2 hrs, then rinsed in distilled H2O. Small speckles of the eggshells were embedded in Spurr medium and thin sections were made ultramicrotome.The crystalline part of eggshells are composed of many small plate-like calcite grains, whose plate normals are approximately parallel to the shell surface. The sizes of the grains are about 0.3×0.3×1 μm3 (Fig.l). These grains are not as closely packed as man-made polycrystalline metals and ceramics, and small gaps between adjacent grains are visible indicating the absence of conventional grain boundaries.

Direct cost of treatment in patients with acute ST-elevation myocardial infarction in Vietnam

MedPharmRes ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 7-11
Author(s):  
Sy Van Hoang ◽  
Tuan Thanh Tran ◽  
Kha Minh Nguyen
Keyword(s):  
Myocardial Infarction ◽  
Direct Cost ◽  
Treatment Cost ◽  
Financial Burden ◽  
Intervention Group ◽  
St Elevation Myocardial Infarction ◽  
Related Factors ◽  
Female Ratio ◽  
Conservative Group ◽  
St Elevation

Background: Acute myocardial infarction has become a serious financial burden for patients, healthcare system, and society. It is therefore necessary to assess treatment cost of myocardial infarction that had been conducted in many countries in the world and still not fully analysed in Vietnam. Thus, we sought to describe acute ST-elevation myocardial infarction treatment cost and analyse related factors to acute ST-elevation myocardial infarction treatment cost. Methods and Materials: A retrospective cross-sectional study. Patients who was diagnosed by ST-elevation myocardial infarction at Cho Ray Hospital from June 2018 to February 2019, satisfied inclusion and exclusion criteria. Results: We collected 130 patients with acute ST-elevation myocardial infarction with male: female ratio of 3:1, at average age of mean ± Standard deviation (SD) = 62.9 ± 12.6. The length of stay in hospital was mean ± SD = 7.1 ± 3.3 days and the median direct cost of MI was 68,902,500 VND (interquartile range (IQR): 5,737,200 – 104,266,000 VND). The average total cost of acute ST-elevation myocardial infarction in the percutaneous coronary intervention group was more than 16 times as the conservative group. The treatment strategies and hospital complications were major factors that affected treatment cost. Conclusion: The median direct cost of acute ST-elevation myocardial infarction was accounted for 68,902,500 VND. Complications directly affected costs.

Scaling risk assessment in a closed circuit recycled board mill by speciation methods

TAPPI Journal ◽  
2012 ◽  
Vol 11 (5) ◽  
pp. 53-61 ◽  
Author(s):  
PATRICK HUBER ◽  
SYLVIE NIVELON ◽  
PATRICE NORTIER
Keyword(s):  
Calcium Carbonate ◽  
Volatile Fatty Acids ◽  
Inorganic Carbon ◽  
Stability Index ◽  
Closed Circuit ◽  
Critical Problem ◽  
Local Scaling ◽  
Water Analyses ◽  
Closed Water ◽  
Speciation Calculation

Calcium carbonate scaling often is a critical problem for recycled board mills that have closed water circuits. The objective of this study was to determine local scaling risks throughout the production process. To predict scaling potential, we calculated several saturation indexes, based on speciation determined from detailed water analyses. Calculated scaling trends are in accordance with observed dissolution and precipitation of calcium carbonate in the process, when considering local aeration phenomena. The importance of volatile fatty acids (resulting from anaerobic bacterial activity) in calco-carbonic equilibriums is discussed, and taken into account in the speciation calculation. We also demonstrate the need to measure inorganic carbon instead of alkalinity in such conditions. This makes typical scaling indexes, such as the Ryznar Stability Index, irrelevant to predict scaling risk in closed circuit conditions; thus, it is necessary to use general speciation methods, as described in this paper.

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