The excited state dynamics of the doubly deprotonated dianion adenosine-5?-triphosphate, [ATP–H2]2–, has been spectroscopically explored by time-resolved photoelectron spectroscopy following excitation at 4.66 eV. Time-resolved spectra show that two competing processes occur for initially populated 1??* state. first is rapid electron emission tunneling through a repulsive Coulomb barrier as res...

The contribution of the metabolic state of human erythrocytes to maintenance of cellular deformability was studied during and after in vitro incubation in serum for periods up to 28 hr. An initial loss of membrane deformability became apparent between 4 and 6 hr when cellular adenosine triphosphate (ATP) levels were approximately 70% of initial values. Membrane deformability then remained stabl...

A model for actin polymerization is proposed in which the rate of elongation of actin filaments depends on whether adenosine 5'-triphosphate or adenosine 5'-diphosphate is bound to the two terminal subunits of the filament. This model accounts quantitatively for the experimental data on the kinetics of filament elongation and explains the effect of ATP hydrolysis on actin polymerization.

A simple and rapid method using high performance liquid chromatography (HPLC) was developed to determine levels of adenosine triphosphate (ATP), adenosine diphosphate (ADP) and adenosine monophosphate (AMP) in litchi fruit pericarp tissue. This HPLC method used acetonitrile gradient elution and shortened the time required for determinations of adenosine phosphates. This analysis exhibited good ...

* Present address, Department of Biochemistry, University of California, Berkeley 4, California. 1 The following abbreviations have been used; THF, tetrahydrofolic acid; lo-formyl-THF, N*o-formyltetrahydrofolic acid; 5,10-methenyl-THF, the cyclic N6-NrOimidazolinium derivative of 5-formyl-THF (anhydroleucovorin or anhydrocitrovorum factor) ; ATP, adenosine triphosphate; ADP, adenosine diphospha...

The unique catalytic activity of vanadium nitrogenase suggests a new direction for the direct production of biofuels from CO with either synthetic catalysts or nitrogenase-containing bacteria. The reduction of CO by V nitrogenase to light hydrocarbons shows striking similarities to the established Fischer-Tropsch process; however, the enzyme does not use H(2) directly for this reaction. ADP=ade...

While short-term elevations in intraocular pressure (IOP) have been shown to increase the concentration of adenosine triphosphate (ATP) in ocular fluids and in the retina, effects of chronic IOP on ATP levels in the eye have not been examined. Using three different animal models of ocular hypertension, Lu et al. observed that ATP and the ectonucleotidase nucleoside triphosphate diphosphohydrola...

Aging is associated with declines in mitochondrial efficiency and energy production which directly impacts the availability of adenosine triphosphate (ATP), contains high phosphates critical for a variety cellular functions. Previous phosphorous magnetic resonance spectroscopy ( 31 P MRS) studies demonstrate cerebral ATP age. The purpose this study was to explore functional relationships fronta...

This study aimed to evaluate, through Adenosine triphosphate (ATP) bioluminescence analysis, the effectiveness of an overheated dry-saturated steam device (Polti Sani System) in decreasing superficial microbial contamination on dental chairs’ surfaces after 30 s disinfection (T1) comparison baseline (T0), i.e., at end aerosol-generating procedure (AGDP), and investigate any differences tested s...