scholarly journals Effects of carbon dioxide on tetanic contraction of frog skeletal muscles studied by phosphorus nuclear magnetic resonance.

1992 ◽  
Vol 453 (1) ◽  
pp. 247-259 ◽  
Author(s):  
T Nakamura ◽  
K Yamada
Keyword(s):  
Carbon Dioxide ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Skeletal Muscles ◽  
Tetanic Contraction ◽  
Nuclear Magnetic

Saturated carbon dioxide nanofluids enhanced oil recovery in carbonate reservoir cores using nuclear magnetic resonance

2021 ◽  
Author(s):  
Yongsheng Tan ◽  
Qi Li ◽  
Liang Xu ◽  
Xiaoyan Zhang ◽  
Tao Yu
Keyword(s):  
Carbon Dioxide ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Carbonate Reservoir ◽  
Carbonate Reservoirs ◽  
Residual Oil ◽  
Core Flooding ◽  
Nuclear Magnetic

<p>The wettability, fingering effect and strong heterogeneity of carbonate reservoirs lead to low oil recovery. However, carbon dioxide (CO<sub>2</sub>) displacement is an effective method to improve oil recovery for carbonate reservoirs. Saturated CO<sub>2</sub> nanofluids combines the advantages of CO<sub>2</sub> and nanofluids, which can change the reservoir wettability and improve the sweep area to achieve the purpose of enhanced oil recovery (EOR), so it is a promising technique in petroleum industry. In this study, comparative experiments of CO<sub>2</sub> flooding and saturated CO<sub>2</sub> nanofluids flooding were carried out in carbonate reservoir cores. The nuclear magnetic resonance (NMR) instrument was used to clarify oil distribution during core flooding processes. For the CO<sub>2</sub> displacement experiment, the results show that viscous fingering and channeling are obvious during CO<sub>2</sub> flooding, the oil is mainly produced from the big pores, and the residual oil is trapped in the small pores. For the saturated CO<sub>2</sub> nanofluids displacement experiment, the results show that saturated CO<sub>2</sub> nanofluids inhibit CO<sub>2</sub> channeling and fingering, the oil is produced from the big pores and small pores, the residual oil is still trapped in the small pores, but the NMR signal intensity of the residual oil is significantly reduced. The final oil recovery of saturated CO<sub>2</sub> nanofluids displacement is higher than that of CO<sub>2</sub> displacement. This study provides a significant reference for EOR in carbonate reservoirs. Meanwhile, it promotes the application of nanofluids in energy exploitation and CO<sub>2</sub> utilization.</p>

Phosphorus nuclear magnetic resonance spectroscopy of cardiac and skeletal muscles

1982 ◽  
Vol 242 (5) ◽  
pp. H729-H744 ◽  
Author(s):  
J. S. Ingwall
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Skeletal Muscles ◽  
Creatine Phosphate ◽  
Resonance Spectroscopy ◽  
Nmr Spectrum ◽  
Phosphorus Containing ◽  
Nuclear Magnetic

Phosphorus nuclear magnetic resonance spectroscopy (P-31 NMR) has been used to assess dynamic aspects of the metabolism of phosphorus-containing compounds in intact cells, organs, and animals. This review describes the NMR experiment and the kinds of information the P-31 NMR spectrum provides for intact, functioning cardiac and skeletal muscles. The P-31 NMR spectrum not only identifies which phosphorus-containing compounds are present in high concentration, namely adenosine 5'-triphosphate (ATP) and creatine phosphate, but also provides information about their chemical environment (including pH) and intracellular distribution. The method is quantitative and nondestructive and permits repetitive measurements in an intact functioning organ. For the perfused heart, it is possible to manipulate the chemical and gaseous composition of the perfusate and to define the effects of, for example, ischemia and reperfusion on the metabolism of ATP and creatine phosphate in the same sample. Using saturation-transfer NMR techniques, it is also possible to measure rates of certain reactions, including creatine kinase and adenylate kinase, in the intact cell. NMR can also be used as an imaging modality.

Comparison of glycolysis and glutaminolysis in Onchocerca volvulus and Brugia pahangi by 13C nuclear magnetic resonance spectroscopy

Parasitology ◽  
1989 ◽  
Vol 99 (3) ◽  
pp. 427-435 ◽  
Author(s):  
N. E. MacKenzie ◽  
E. A. Van De Waa ◽  
P. R. Gooley ◽  
J. F. Williams ◽  
J. L. Bennett ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Onchocerca Volvulus ◽  
Resonance Spectroscopy ◽  
Brugia Pahangi ◽  
Mixed Acid ◽  
13C Nuclear Magnetic Resonance ◽  
Acid Fermenter ◽  
Nuclear Magnetic

SummaryComparison of glycolysis in Brugia pahangi and Onchocerca volvulus by C nuclear magnetic resonance (NMR) spectroscopy showed that the former organism is predominantly a lactate fermenter and the latter resembles more closely the metabolism of a mixed acid fermenter producing lactate, succinate, acetate, ethanol, formate and carbon dioxide. Both organisms synthesize glycogen as a storage carbohydrate. Glutaminolysis in both organisms proceeds by the δ-aminobutyrate shunt to produce succinate which is then further metabolized to acetate and carbon dioxide as end-products.

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