M*- adenine

Fig. 3.4. Differential pulse voltammetric determination of purine and pyrimidine bases guanine (2 x lO- M), adenine (3 x I0-5 M), thymine (3 x 0 4 M) and cytosine (3 x 10 4 M) in borate buffer (pH = 10.02) (a) with ultrasonic pretreatment (power intensity 72 W/cm2, horn tip-electrode separation 5 mm, (b) successive scan without ultrasonic pretreatment. DPV conditions scan rate 5 mV/s, amplitude 50 mV. (Reprinted from ref. [68] with...

The spectrum has been measured in the presence of 10 M adenine by using the 632.8-nm exciting line of a He-Ne laser. Although the laser power is low (around 5 mW), the resonance with the plasmonic band at 624 nm (see Fig. 20.4) ensures... 

Reaction 6. Succinate dehydrogenase then catalyzes the oxidation of succinate to fumarate in the next step. The oxidizing agent,//op/m adenine dinucleotide (FAD), is reduced in this step ... 

Fig. 7.8 Binding of to purine nucleo-bases of DNA. (a) M -adenine (b) guanine.

Fig. 10. SERS spectra of poly-A and its building stones adenine, adenosine 5 -monophosphate and ribose 5-phosphate. Freshly prepared silver colloids, pH 4.5 4 x 10 M adenine, 5 -AMP or ribose 5-phosphate added poly-A concentration 1.6mg/ml Laser excitation line 514nm, laser power 200 mW. (The drawing of poly-A in d shows the adenine base and the sugar-phosphate backbone outside the molecule)...

Fig. 13. SERS-spectrum of a solution containing adenine, guanine, cytosine and thymine. Freshly prepared silver colloids, pH 4.5, 4x 10 M adenine, guanine, cytosine and thymine added laser excitation line 514 nm, laser power 100 mW...

Figure 50. Pressure-area isotherms for L36 (a) pure water as subphase, (b) 0.1 M adenine in pure water as subphase at 298 K.

In the presence of 100 pg/m adenine, /3-galactosidase synthesis was repressed by more than 90%. After removal of the adenine there was a lag of about 6-8 minutes before j3-galactosidase activity could be detected, after which its activity increased linearly for at least 30 minutes. 

Fig. 1. Chromatography on a DNA-Sepharose 4B column. For enzyme assay each fraction was incubated with 1 vc M [adenine- HJNAD and 100 Mg of whole histones in a total volume of 0.2 ml (pH 9.0). Incubation was carried out at 25°C for 30 min. — enzyme activity --- NaCl concentrations. (Data from [31)...

As far as we know a link between cytokinin and protein phosphorylation has only been documented for Chinese cabbage leaf discs [21]. Microsomes from leaves treated with 2 X 10 M cytokinin solution had a reduced (by 25 to 50%) ability to use ATP to phosphorylate membrane proteins as compared with that of microsomes from water-treated controls. Without the results from leaves treated with 2 X lO M adenine solution, we cannot tell if this effect is cytokinin-specific. If cytokinins can act via alteration of the cytosolic calcium concentration it is then possible that cytokinin treatment will result in activation of one or more of the Ca -regulated protein kinases shown to be present in plant tissues [22, 23]. 

C2oH32Cl2N20i,Rh2, cis-Dicarbonyl-glyoxal-bis(2,4-dimethylpentyl-3-imine)rhodium(I) cis-dicarbonyl-dichlororhodate(I), 46B, 1097 C20H32CI2N12O1uPt 7 H2O, cis-Diamminebis(guanosine)platinum(II) chloride perchlorate heptahydrate, 46B, 1098 C20H32CI4CU2N20O6, Dichlorotetra-M adenine-dicopper(II) chloride hexahydrate, 37B, 552... 

The M -guanine binding energies are about 18-27 kcal/mol larger than those of M -adenine, the differences decreasing along the row of these metal cations (Noguera et al. 2008). 

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