A. WANIC (a), and W. WOLSKI (d) Neutron spectrometric investigations are made of goethite (a-FeOOH) of mineralogical and synthetic origin (a-FeOOH of natural isotopic composition) and also of a-FeOOD using a monochromatic neutron beam of I = 1.12 A. Some powder diffraction patterns in the temperature range from -190 to +120 "C are measured. The obtained coordinates for all atoms (including those for hydrogen) in the unit cell are given. The existence of antiferromagnetic spin ordering a t temperatures below +SO "C is observed. A model is proposed in which the spins are aligned parallel to the b-axis. EbIn EICCJIeHOBaH reTIIT (cc-FeOOH) MuHepanora4ecKoro IIPOMCXOmAeHHR EI CEIH-TeTElseCHIlfi (eCTeCTBeHHOr0 E130TOnWleCKOrO COCTaBa) a TaKme AefiTepEI3OBaHHbIfi W T H T a-FeOOD. kICCJIeAOBaHHfI BeJIEICb B B m s a (~rOCJIaBEIH) IIpH peaKTope PA. ,&JIH M3MepeHHn HCIZOJI3OBPHO KPaKOBCKllfi HefiTpOHHblfi KpEICTNIJlEI~eCKEl~ CIIeK-TpOMeTp EI IIyuOK HefiTpOHOB C AJIUHOfi BOJlHbI A = 1,12 A. TeMnepaTypa o6paaua U3MeHIIJIaCb B IIpeAeJlaX OT -190 HO +I20 "c. YTOYHeHO HOOPAEIHaTbI aTOMOB BbInO 06HapymeHO CyrrleCTBOBaHIIe aHTEl-meneaa II wicnopona B s n e~e~~a p~o t m e h e , a TaKme B nepwfi pa3 6b1no onpe-#eppoMarHmHoro ynopHAoseHm CIIEIHOB EIOHOB meneaa B TeMnepaTypax HHme +80 "C. ~P M B O A E I T C R MoAen C~E~H O B O~~ peluema B KOTOPOP C~E I H~I napanenmb1 OCM b.HeJIeHO IIOJIOmeHEIe aTOMOB BOAOpOAa.
The kinetics of the title reaction was studied under anaerobic conditions at 25 °C, ionic strength 0.10 M (sodium perchlorate), and pH 4.00-5.32. A catalytic pathway associated with Ru(NH3)5OH22+ produced in the outer-sphere redox equilibration between Ru(NH3)5OH23+ and Fe(CN)6*~w as suppressed by the addition of Fe(CN)63". The proposed mechanism features rapid formation of the ion pair Ru(NH3)5OH23+|Fe(CN)64_ (formation constant (2.1 ± 0.6) X 103 M"1) and its subsequent slow reaction (k = (6.9 ± 0.7) X 10~4 s'1) to produce (NH3)5RuIIINCFeII(CN)5•. The latter compound features an intervalence (metal to metal)
Electrochemical nanosensors were used to simultaneously monitor in vitro (a single endothelial cell) and in vivo (vasculature of rat) the concentrations of NO (vasorelaxant) ] ¼ (K) was applied as the diagnostic marker of dysfunctional endothelium and cardiovascular disease. In the isolated endothelium of normotensive rats, K ¼ 2.8 AE 0.1 while in hypertensive rats, K ¼ 0.4 AE 0.1. During ischemia, K dropped from 7 AE 1 to 1.4 AE 0.2 and further decreased to 0.05 AE 0.01 during reperfusion. The edema and vasoconstriction, indicators of vascular injury, correlated directly with the decrease in K.
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