Effect of carrier substance concentration and pH on32P measurement instability in a scintillation solution

1983 ◽  
Vol 80 (1-2) ◽  
pp. 223-227 ◽  
Author(s):  
R. Rexa ◽  
R. Tykva
Keyword(s):  
Substance Concentration ◽  
Scintillation Solution

Fed-batch cultures of recombinant Escherichia coli with inhibitory substance concentration monitoring

1988 ◽  
Vol 66 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Norio Shimizu ◽  
Shinichi Fukuzono ◽  
Kiyoshi Fujimori ◽  
Nabuko Nishimura ◽  
Yoji Odawara
Keyword(s):  
Escherichia Coli ◽  
Recombinant Escherichia Coli ◽  
Fed Batch ◽  
Inhibitory Substance ◽  
Batch Cultures ◽  
Substance Concentration

A Ceramic Tubular Probe For Online Substance Concentration Measurement, Manufactured By Ceramic Injection Molding

2012 ◽  
Vol 2012 (1) ◽  
pp. 000604-000608
Author(s):  
Matthias Hartmann ◽  
Bertram Schmidt
Keyword(s):  
Injection Molding ◽  
Zirconium Oxide ◽  
Large Scale ◽  
Low Cost ◽  
Tetragonal Zirconia ◽  
Scale Production ◽  
Ceramic Injection Molding ◽  
Substance Concentration ◽  
Sensor Effect ◽  
Concentration Measurements

The current research presents recent respective to the work development of a ceramic tubular probe for online substance concentration measurements. The aim was to develop a robust and acid-resistant sensor device, which can be easily included in existing procedural pipeline systems. To archive those goals a lot of factors had to be checked. For the substance concentration measurements a capacitive sensor effect was chosen. With this method even low substance concentrations down to one-tenth of a per cent can be indentified. For the package material zirconium oxide (tetragonal zirconia polycrystal – TZP) was used. Zirconium oxide is a technical ceramic which is wear-resistant, acid-resistant, has a low thermal conductivity, is electrically isolating and can be uses in a ceramic injection molding (CIM) process. In the phase of the sensor design process multiple geometries for the sensor effect and integration space for the evaluation electronics had to be considered. A standardized DN 10 DIN 32676 flanged joint was also added for an unproblematic connection to the pipelines. All these needed geometries had to be integrated into one ceramic element. As a result of these requirements a 3D CAD model of the sensor element was designed. The CAD-file has shown that there was only the CIM technology left to comprehend developed sensor geometry. CIM is a low cost process for large-scale production which is distinguished by high size accuracy. In the CIM process the material shrinkage, this is caused by the needed debindering and sintering steps, had to be considered. The developed ceramic tubular probe was successfully tested in multiple fluidic systems. It has left the test phase and is now ready for maturity phase.

scholarly journals Large-Volume Liquid Scintillation Counting of Carbon-14

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 417-427 ◽  
Author(s):  
Lorenz Eichinger ◽  
Werner Rauert ◽  
Josef Salvamoser ◽  
Manfred Wolf
Keyword(s):  
Detection Limit ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Measuring Chamber ◽  
Carbon 14 ◽  
Experimental Detection ◽  
Scintillation Solution ◽  
Special Measuring ◽  
Experimental Detection Limit

Efforts have been undertaken to further improve the relatively simple technique of low-level liquid scintillation counting of 14C. Two different approaches have been made. By synthesizing more benzene for 14C measurement than usual (with up to 19.5g of carbon) an experimental detection limit of about 0.1 percent modern has been achieved (97.5% confidence level, 1000 min). Absorption of CO2 with up to 5.3g of carbon in 160ml of an absorbent-scintillation solution and counting in a special measuring chamber resulted in an experimental detection limit of about 1 percent modern, with the sample preparation taking only 1 hour. The detection limits achieved by the two techniques correspond to 14C ages of about 55,000 and 35,000 years BP, respectively.

scholarly journals Prediction of Substance Concentration in Simulated Moving Bed by Ultraviolet Sensor and Neural Network

2020 ◽  
Vol 32 (9) ◽  
pp. 2971
Author(s):  
I-Chun Chen ◽  
Rey-Chue Hwang ◽  
Chi-Yen Shen ◽  
Shen-Whan Chen ◽  
Huang-Chu Huang
Keyword(s):  
Neural Network ◽  
Simulated Moving Bed ◽  
Moving Bed ◽  
Substance Concentration ◽  
Ultraviolet Sensor

scholarly journals The reference range of serum magnesium substance concentration among healthy young adults at Makerere University College of Health Sciences 2012

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
Andrew L. Okwi ◽  
Gabriel S. Bimenya ◽  
Lynette K. Tumwine ◽  
Emmanuel Othieno ◽  
Julius Okot ◽  
...  
Keyword(s):  
Young Adults ◽  
Medical Students ◽  
Active Transport ◽  
Reference Range ◽  
Serum Magnesium ◽  
Venous Blood ◽  
Extracellular Fluid ◽  
Reference Ranges ◽  
Substance Concentration ◽  
Active Transport System

Background: Magnesium is the second most abundant intracellular cation, with only a small proportion of the body’s content being in the extracellular fluid. It is required for the active transport of other cations such as calcium, sodium and potassium across the membrane by active transport system. It is also needed for many intracellular metabolic pathways. This study was carried to establish the reference intervals for serum magnesium substance concentration among healthy medical students in Uganda.Methods: This was purposive study in which ante-cubital venous blood samples were drawn without stasis from 60 healthy, natively Ugandan pre-clinical medical students and analysed without delay using Cobasintegra 400/700/800 automated analyser which flagged each result using the in-built seemingly temperate reference range of 0.65-1.05 mmol/L.Results: The distribution of serum magnesium substance concentration was unimodal, leptokurtic, and positively skewed with empirical range of 0.86 – 1.32 mmol/L. There was no result flagged as low. Twenty-six out of sixty (43.3%) results were flagged as high values while none approached 2.0 mmol/L, considered the threshold of hypermagnesaemia symptoms. Using the central 95 percentile, the reference range was set as 0.81 – 1.29 mmol/L which is higher and slightly broader than the 0.65 – 1.05 mmol/L often quoted for populations in temperate regions and in-built in automated analysers exported even to the tropics.Conclusion: Reference ranges were higher in the studied healthy young adults in Uganda than those in the temperate regions. Effort should therefore be made to enable our laboratories establish their own reference values.

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