Evaluation of the effect of fat content of sunflower meal on rumen fungi growth and population by direct (quantitative competitive polymerase chain reaction) and indirect (dry matter and neutral detergent fibre disappearance) methods

2011 ◽  
Vol 11 (1) ◽  
Author(s):  
T. Mohammadabadi
Keyword(s):  
Polymerase Chain Reaction ◽  
Dry Matter ◽  
Fat Content ◽  
Sunflower Meal ◽  
Chain Reaction ◽  
Competitive Polymerase Chain Reaction ◽  
Neutral Detergent Fibre ◽  
Polymerase Chain

Differential display competitive polymerase chain reaction: An optimal tool for assaying gene expression

1999 ◽  
Vol 20 (2) ◽  
pp. 230 ◽  
Author(s):  
Marianne Jorgensen ◽  
Maja Bévort ◽  
Thuri S. Kledal ◽  
Brian V. Hansen ◽  
Marlene Dalgaard ◽  
...  
Keyword(s):  
Gene Expression ◽  
Polymerase Chain Reaction ◽  
Differential Display ◽  
Chain Reaction ◽  
Competitive Polymerase Chain Reaction ◽  
Polymerase Chain

Na-K-ATPase isoform (alpha 3, alpha 2, alpha 1) abundance in rat kidney estimated by competitive RT-PCR and ouabain binding

1996 ◽  
Vol 271 (2) ◽  
pp. F253-F260 ◽  
Author(s):  
K. Lucking ◽  
J. M. Nielsen ◽  
P. A. Pedersen ◽  
P. L. Jorgensen
Keyword(s):  
Polymerase Chain Reaction ◽  
Rat Kidney ◽  
Sodium Reabsorption ◽  
Rt Pcr ◽  
Ouabain Binding ◽  
Chain Reaction ◽  
Competitive Polymerase Chain Reaction ◽  
High Affinity ◽  
Upper Limit ◽  
Polymerase Chain

For understanding the regulation of sodium reabsorption, it is important to know whether the alpha 2- or alpha 3-isoform of Na-K-adenosinetriphosphatase (Na-K-ATPase) is expressed in mammalian kidney in addition to the predominant alpha 1 beta 1-isozyme. Here we applied competitive polymerase chain reaction (PCR) for estimation of mRNA in parenchymal zones of rat kidney for comparison to high-affinity [3H]ouabain binding. The alpha 3-isoform mRNA was demonstrated to form 0.04-0.05% of the amount of alpha 1-isoform mRNA in the cortex, medulla, and papilla of rat kidney. The alpha 2-mRNA was demonstrated in all three zones and constituted 0.03% of the amount of alpha 1-mRNA in cortex. The abundance of the alpha 1 truncated mRNA was 0.1-0.8% of that of the alpha 1-mRNA. The upper limit for expression of Na-K-ATPase isozyme with high ouabain affinity (dissociation constant, 69-141 nM) was 0.096-0.14% of the concentration of alpha 1 beta 1-Na-K-ATPase. Thus a small but well-defined pool of alpha 2- and alpha 3-isoforms constitutes < or = 0.1% of the amount of alpha 1-isoform at both the mRNA and protein level in rat kidney.

scholarly journals State of the Art and Limitations of Quantitative Polymerase Chain Reaction

2002 ◽  
Vol 85 (3) ◽  
pp. 792-796 ◽  
Author(s):  
Gordon Wiseman
Keyword(s):  
Polymerase Chain Reaction ◽  
State Of The Art ◽  
Quantitative Polymerase Chain Reaction ◽  
Processed Foods ◽  
Quantitative Real Time Pcr ◽  
Chain Reaction ◽  
Competitive Polymerase Chain Reaction ◽  
Polymerase Chain ◽  
Analytical Result ◽  
The Many

Abstract Consequential to the implementation of European Commission (EC) Regulation 1139/98, EC Regulation 49/2000, and EC Regulation 50/2000 has been the need to measure accurately the levels of the genetically modified (GM) species Roundup Ready Soya and Bt 176 Maize that are present in food. Analytical methods to detect and quantitate these transgenic species have received much attention particularly with respect to the deminimus threshold of 1% for their presence in materials derived from non-GM identity-preserved (IP) supplies. The relative advantages and limitations of threshold analysis by double-competitive polymerase chain reaction (PCR) and quantitative real-time PCR are discussed in their application to the quantitative analysis of processed foods. Consideration is also given to other factors involved in the analyses that affect the performance of quantitative procedures, and to the many uncertainties involved in the precision of a reported analytical result.

scholarly journals In vivo and in vitro regulation of erythropoietin mRNA: measurement by competitive polymerase chain reaction

Blood ◽  
1993 ◽  
Vol 81 (3) ◽  
pp. 617-623 ◽  
Author(s):  
J Fandrey ◽  
HF Bunn
Keyword(s):  
Polymerase Chain Reaction ◽  
Hepatoma Cell ◽  
Hepatoma Cell Line ◽  
Mrna Levels ◽  
Chain Reaction ◽  
Human Hepatoma Cell ◽  
Competitive Polymerase Chain Reaction ◽  
Polymerase Chain

Abstract The regulation of erythropoietin (Epo) production was investigated by competitive polymerase chain reaction, a highly sensitive and accurate means of measuring Epo mRNA levels. Co-amplification of the test sample with added mutant Epo cDNA template corrects for variability in the efficiency of amplification. Epo mRNA levels were determined in tissues of normal rats and in animals with varying degrees of anemia. Reduction of the hematocrit level from 0.40 to 0.15–0.20 resulted in a 300-fold increase in kidney Epo mRNA, which comprised 80% of the total Epo mRNA versus 20% from the liver. In contrast, very low levels detected in lung and spleen were not significantly increased by anemia. The human hepatoma cell line, Hep3B, secretes high levels of Epo in response to hypoxia. This regulation is, to a large extent, transcriptional. When Hep3B cells were incubated in the presence of decreasing O2 tension from 160 to 7 mm Hg, there was a monotonic increase in Epo mRNA to 50 to 100 times the normoxic level. Hyperoxia did not suppress basal expression. When cells were incubated at a PO2 of 7 mm Hg, induction of Epo mRNA was first noted at 30 minutes and was maximal at 5 to 6 hours. After Epo mRNA was boosted by a 4-hour hypoxic incubation, cells were then exposed to normoxia, which shut off further transcription of the Epo gene. The decay of Epo mRNA levels closely followed first order kinetics with a half-life of 2 hours, an effective measurement of message stability.

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