ATP content and adenylate energy charge of the mussel Mytilus edulis during the annual reproductive cycle in Lind�spollene, Western Norway

1982 ◽  
Vol 70 (1) ◽  
pp. 1-6 ◽  
Author(s):  
H. R. Skjoldal ◽  
S. Barkati
Keyword(s):  
Mytilus Edulis ◽  
Reproductive Cycle ◽  
Energy Charge ◽  
Adenylate Energy Charge ◽  
Atp Content ◽  
Annual Reproductive Cycle ◽  
Western Norway

scholarly journals The stimulus–secretion coupling 4-methyl-2-oxopentanoate-induced insulin release

1979 ◽  
Vol 184 (2) ◽  
pp. 303-311 ◽  
Author(s):  
J C Hutton ◽  
A Sener ◽  
W J Malaisse
Keyword(s):  
Insulin Release ◽  
Metabolic Flux ◽  
Energy Charge ◽  
Hyperbolic Function ◽  
Maximal Response ◽  
Coupling Mechanism ◽  
Adenylate Energy Charge ◽  
Atp Content ◽  
45Ca Uptake ◽  
Stimulus Secretion Coupling

1. Pancreatic islet insulin secretion and 45Ca uptake showed similar responses to variation in the extracellular concentration of 4-methyl-2-oxopentanoate with a threshold at 4 mM and a maximal response at a 25 mM concentration. 2. Islet respiration, acetoacetate production and rates of substrate utilization, oxidation and amination all changed as a simple hyperbolic function of 4-methyl-2-oxopentanoate concentration and exhibited a maximal response at 25 mM. 3. The responses of ATP content, [ATP]/[ADP] ratio, adenylate energy charge and [NADH]/[NAD+] ratio were also hyperbolic in nature but were maximally elevated at lower concentrations of the secretagogue. The islet [NADPH]/[NADP+] ratio, however, was tightly correlated with parameters of metabolic flux, 45Ca uptake and insulin release. 4. NH4+ and menadione, agents that promote a more oxidized state in islet NADP, did not affect islet ATP content or the rates of [U-14C]4-methyl-2-oxopentanoate oxidation or amination, but markedly inhibited islet 45Ca uptake and insulin release. 5. It is proposed that changes in the redox state of NADP and Ca transport may serve as mediators in the stimulus-secretion coupling mechanism of insulin release induced by 4-methyl-2-oxopentanoate.

Adenosine 5′-triphosphate and adenylate energy charge in sheep digesta

1982 ◽  
Vol 98 (3) ◽  
pp. 523-528 ◽  
Author(s):  
R. J. Wallace ◽  
Aileen A. West
Keyword(s):  
Microbial Activity ◽  
Metabolic Activity ◽  
Dry Matter ◽  
Alimentary Tract ◽  
Energy Charge ◽  
Adenylate Energy Charge ◽  
Large Decrease ◽  
Atp Content ◽  
Bioluminescence Method ◽  
Ciliate Protozoa

SUMMARYThe concentrations of adenosine 5′-mono-, -di-, and -triphosphate (AMP, ADP and ATP) in sheep digesta were measured by a new bioluminescence method. ATP in rumen digesta varied with time after feeding and diet, and most markedly according to the size of the population of ciliate protozoa: the ATP content of rumen digesta from ciliate-free sheep was less than a quarter of that of faunated animals receiving the same diet. The adenylate energy charge (EC) (ATP + ADP/[ATP + ADP + AMP]), an indicator of metabolic activity, was high (0·77–0·94) in all rumen samples, but did not appear to be as useful a measurement of activity as ATP alone. As digesta passed along the alimentary tract, the ATP content decreased progressively, from 0·9–2·2 μmol/g dry matter in the rumen to 0·5–1·0μmol/g in the abomasum and duodenum, 07middot;03–0·08 μmol/g in ileal digesta and 0·01–0·02 μmol/g in faeces. EC also tended to decrease, further emphasizing the large decrease in microbial activity which occurs in the hindgut.

Regulation at the Phosphoenolpyruvate Branchpoint by the Adenylate Energy Charge in Mytilus edulis

1976 ◽  
Vol 4 (3) ◽  
pp. 444-447 ◽  
Author(s):  
ROBERTUS H. M. EBBERINK ◽  
ALBERTUS DE ZWAAN ◽  
THEODORUS C. M. WIJSMAN
Keyword(s):  
Mytilus Edulis ◽  
Energy Charge ◽  
Adenylate Energy Charge

Adenylate Energy Charge in Mytilus edulis L. during Exposure to Air

1976 ◽  
Vol 4 (3) ◽  
pp. 442-443 ◽  
Author(s):  
THEODORUS C. M. WIJSMAN ◽  
ALBERTUS DE ZWAAN ◽  
ROBERTUS H. M. EBBERINK
Keyword(s):  
Mytilus Edulis ◽  
Energy Charge ◽  
Adenylate Energy Charge

Relief of thermoinhibition in Grand Rapids lettuce seeds by oxygen plus kinetin and their effects on respiration, content of ethanol and ATP and synthesis of ethylene

1993 ◽  
Vol 3 (2) ◽  
pp. 129-135 ◽  
Author(s):  
J. G. Chris Small ◽  
Colleen Schultz ◽  
Elbie Cronje
Keyword(s):  
Energy Charge ◽  
Similar Response ◽  
Adenylate Energy Charge ◽  
Atp Content ◽  
Inhibitory Effects ◽  
Ethanolic Fermentation ◽  
Lettuce Seeds ◽  
Grand Rapids ◽  
Effect Of Oxygen ◽  
High Level

AbstractSeed germination of Grand Rapids lettuce (Lactuca sativa L.) was inhibited at 38°C (thermoinhibition). Thermoinhibition was totally relieved by a combination of 100% oxygen and 10 mg I−1 kinetin, to a lesser extent by a combination of oxygen and ethylene but not at all by oxygen plus GA3. The combination of oxygen with kinetin or ethylene was more effective in preventing thermoinhibition than a combination of all three hormones and CO2 in air. The beneficial effect of oxygen plus kinetin was not related to either increased production of CO2 or ethylene by the seeds. In air, germination was partially inhibited by 2-aminoethoxyvinyl glycine (AVG) or 2,5-norbornadiene (NBD) and totally inhibited by AVG plus NBD. Oxygen plus kinetin almost completely alleviated their inhibitory effects. It was concluded that oxygen plus kinetin caused seeds to bypass an ethylene requirement for germination or increased the sensitivity of seeds to ethylene. In air at 38°C, seeds exhibited a high level of ethanolic fermentation, while in oxygen plus kinetin they respired aerobically. At 38°C in air, contents of ATP and total adenylates were reduced, while in seeds treated with oxygen plus kinetin these contents were similar or higher than in 25°C controls. A similar response was also observed for adenylate energy charge. It was concluded that part of the mechanism of thermoinhibition could be the failure of ATP content to reach a sufficient level to satisfy the requirement for germination at 38°C. It appeared possible that the prevention of thermoinhibition by oxygen plus kinetin could be related to increased ATP content in seeds caused by this treatment.

ATP content and adenylate energy charge ofBacillus stearothermophilus during growth

1988 ◽  
Vol 16 (5) ◽  
pp. 271-275 ◽  
Author(s):  
JoAnn J. Webster ◽  
Billy G. Walker ◽  
Franklin R. Leach
Keyword(s):  
Energy Charge ◽  
Adenylate Energy Charge ◽  
Atp Content ◽  
Ofbacillus Stearothermophilus
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