scholarly journals The Effect of Calcium Carbonate and Cholecalciferol on Pharmacokinetic Interaction of 99m/Tc-CTMP Radiopharmaceuticals for Bone Scanning in Rats (Rattus norvegicus)

2018 ◽  
Vol 44 (2) ◽  
pp. 69
Author(s):  
I. Mahendra ◽  
I. Daruwati ◽  
T. H. Ambarwibawa ◽  
W. Nuraeni
Keyword(s):  
Calcium Carbonate ◽  
Rattus Norvegicus ◽  
Pharmacokinetic Interaction ◽  
Bone Scanning

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.

Decisive Diagnosis of Infected Mandibular Osteoradionecrosis with a Tc-99m-labelled Anti-granulocyte Fab′-fragment

1999 ◽  
Vol 38 (07) ◽  
pp. 309-311 ◽  
Author(s):  
W. Brenner ◽  
H. Terheyden ◽  
K. H. Bohuslavizki ◽  
E. Henze ◽  
W. U. Kampen
Keyword(s):  
Blood Pool ◽  
Bone Scanning ◽  
Acute Osteomyelitis ◽  
Elevated Blood ◽  
Fab Fragment ◽  
Postoperative Changes ◽  
Three Phase ◽  
Golden Standard ◽  
Blood Pool Activity ◽  
Bone Inflammation

SummaryThe accepted golden standard for detection of inflammatory bone disease is conventional three-phase bone scanning. Hyperperfusion, a high blood-pool activity and elevated bone metabolism are typical signs for an acute osteomyelitis. However, in case of subacute, chronic inflammation, neither elevated blood flow nor high blood-pool activity may be seen. This may cause difficulties in differentiating such cases from neoplastic or postoperative changes. This case report verifies the possible advantage of immunoscintigraphy with Tc-99m-labelled antigranulocyte Fab′-fragments (LeukoScan®) in a patient with infected mandibular osteoradionecrosis, who had equivocal clinical symptomes and questionable radiographic results. LeukoScan® is shown to be more sensitive in case of subacute bone inflammation compared with three-phase bone scanning. However, acquisition of delayed images after 24 hours including SPECT is inevitable in case of negative scans during the first hours of investigation.

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.

A method for measuring the in-plane compressive strength and the compression behavior of coating layers

TAPPI Journal ◽  
2011 ◽  
Vol 10 (7) ◽  
pp. 29-34
Author(s):  
TEEMU PUHAKKA ◽  
ISKO KAJANTO ◽  
NINA PYKÄLÄINEN
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Calcium Carbonate ◽  
Coating Layer ◽  
Test Methods ◽  
Coating Films ◽  
Precipitated Calcium Carbonate ◽  
Coating Color ◽  
Mineral Coatings ◽  
Styrene Butadiene

Cracking at the fold is a quality defect sometimes observed in coated paper and board. Although tensile and compressive stresses occur during folding, test methods to measure the compressive strength of a coating have not been available. Our objective was to develop a method to measure the compressive strength of a coating layer and to investigate how different mineral coatings behave under compression. We used the short-span compressive strength test (SCT) to measure the in-plane compressive strength of a free coating layer. Unsupported free coating films were prepared for the measurements. Results indicate that the SCT method was suitable for measuring the in-plane compressive strength of a coating layer. Coating color formulations containing different kaolin and calcium carbonate minerals were used to study the effect of pigment particles’ shape on the compressive and tensile strengths of coatings. Latices having two different glass transition temperatures were used. Results showed that pigment particle shape influenced the strength of a coating layer. Platy clay gave better strength than spherical or needle-shaped carbonate pigments. Compressive and tensile strength decreased as a function of the amount of calcium carbonate in the coating color, particularly with precipitated calcium carbonate. We also assessed the influence of styrene-butadiene binder on the compressive strength of the coating layer, which increased with the binder level. The compressive strength of the coating layer was about three times the tensile strength.

The solubility of calcium carbonate  in green liquor handling systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (10) ◽  
pp. 595-602
Author(s):  
ALISHA GIGLIO ◽  
VLADIMIROS G. PAPANGELAKIS ◽  
HONGHI TRAN
Keyword(s):  
Calcium Carbonate ◽  
Systematic Study ◽  
Kraft Pulp ◽  
Thermodynamic Simulation ◽  
Solubility Data ◽  
Pulp Mills ◽  
Persistent Problem ◽  
Green Liquor ◽  
Kraft Pulp Mills ◽  
Salt Systems

The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.

Pengaruh Pemberian Ekstrak Daun Kluwih (Artocarpus camansi) Terhadap Penurunan Aktivitas SGPT Tikus Putih (Rattus norvegicus) Jantan Galur Wistar yang di Induksi Parasetamol Dosis Tinggi.

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Bara Pawana Satya Nagara
Keyword(s):  
Rattus Norvegicus ◽  
Control Group ◽  
Post Test

ABSTRAK Latar Belakang: Kebiasaan masyarakat Indonesia menggunakan obat-obatan yang mudah didapat seperti parasetamol, dimana parasetamol dijual secara bebas akan menyebabkan penyalahgunaannya menjadi lebih besar.Penyalahgunaan ini berakibat timbulnya efek samping  seperti efek hepatotoksik yang menimbulkan kerusakan pada sel-sel hati. Pengendalian efek hepatotoksi didalam tubuh dapat dibantu dengan mengkonsumsi makanan yang mengandung antioksidan. .Ekstrak daun kluwih (Artocarpus camansi) memiliki kandungan antioksidan seperti flavanoid yang diyakini dapat menurunkan aktivitas SGPT dan mengurangi efek toksisitas hepar oleh parasetmol. Tujuan: Tujuan penelitian ini adalah untuk mengetahui pengaruh pemberian ekstrak daun kluwih (Artocarpus camansi) terhadap penurunan aktivitas SGPT  tikus putih (Rattus norvegicus) jantan galur Wistar yang diinduksi parasetamol. Metode: Merupakan post-test only control group mengunakan hewan coba tikus putih jantan galur Wistar yang dikelompokkan menjadi 3 kelompok yaitu kelompok kontrol (-), kelompok kontrol (+), kelompok perlakuan yang mendapat terapi ekstrak daun kluwih (Artocarpus camansi) 500 mg/Kg BB Hasil: Hasil penelitian menunjukkan pemberian ekstrak daun kluwih (Artocarpus camansi) dosis 500 mg/kg/BB/hari pada tikus tidak menurunkan secara bermakna aktivitas SGPT pada kelompok tikus yang diberi parasetamol dosis tinggi ( p=0,401 α=0,05) Kesimpulan: Parasetamol dosis tinggi meningkatkan secara bermakna aktivitas SGPT tikus putih (Rattus norveicus) galur Wistar. Pemberian ekstrak daun kluwih (Artocarpus camansi) pada aktivitas SGPT tikus putih (Rattus norveicus) galur Wistar menurunkan  secara tidak bermakna. Kata kunci : Artocarpus camansi, Parasetamol, SGPT

Overtraining of aerobic physical exercise reduce rats (Rattus norvegicus) memory

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Ni Made Ridla Parwata
Keyword(s):  
Body Weight ◽  
Physical Exercise ◽  
Rattus Norvegicus ◽  
Research Method ◽  
Male Rat ◽  
Control Group ◽  
Adult Male Rat ◽  
The Subject ◽  
Heavy Training

Overtraining syndrome is a decrease in physical capacity, emotions and immunity due to training that is too often without adequate periods of rest. Overtraining is often experienced by athletes who daily undergo heavy training with short break periods. This research aims to look at the effect of overtraining aerobic physical exercise on memory in mice. The research method was experimental in vivo with the subject of adult male rat (Rattus Norvegicus) Winstar strain aged 8-10 weeks, body weight 200-250 gr. Divided into three groups, namely the control group, aerobic group and overtraining group. The results of memory tests with water E Maze showed an increase in the duration of travel time and the number of animal errors made by the overtraining group (p = 0.003). This study concludes that overtraining aerobic physical exercise can reduce memory in rat hippocampus.

Sign in / Sign up

Export Citation Format

Share Document