In situ measurement of pH in the interior of conducting polymer microtubules

Nath, Archana; Kanungo, Mandakini; Contractor, A.Q.

doi:10.1016/s0022-0728(03)00354-1

Cited by 19 publications

(12 citation statements)

References 46 publications

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“…This polymerized form is insoluble, thus resulting in deposition on the working electrode. Prior studies of polymerized BPB describe direct deposition of BPB onto glassy carbon electrodes 24, 25, while deposition on Au electrodes has involved using a supporting polymer matrix such as PPY 21 or PANI 26. However, a high concentration of BPB is desirable to take full advantage of its optical switching properties, making BPB diluted in a supporting polymer matrix less desirable for switching applications.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Observation of Calcium‐Induced Reorientation of Cellobiose Dehydrogenase Immobilized on Electrodes and its Effect on Electrocatalytic Activity

et al. 2015

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Cellobiose dehydrogenase catalyzes the oxidation of various carbohydrates and is considered as a possible anode catalyst in biofuel cells. It has been shown that the catalytic performance of this enzyme immobilized on electrodes can be increased by presence of calcium ions. To get insight into the Ca(2+) -induced changes in the immobilized enzyme we employ surface-enhanced vibrational (SERR and SEIRA) spectroscopy together with electrochemistry. Upon addition of Ca(2+) ions electrochemical measurements show a shift of the catalytic turnover signal to more negative potentials while SERR measurements reveal an offset between the potential of heme reduction and catalytic current. Comparing SERR and SEIRA data we propose that binding of Ca(2+) to the heme induces protein reorientation in a way that the electron transfer pathway of the catalytic FAD center to the electrode can bypass the heme cofactor, resulting in catalytic activity at more negative potentials.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic Observation of Calcium‐Induced Reorientation of Cellobiose Dehydrogenase Immobilized on Electrodes and its Effect on Electrocatalytic Activity

et al. 2015

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“…For completeness, we begin with a brief summary of the independent parameters generated by softly broken supergravity theories which are needed to test such models at colliders and in dark matter experiments. Comprehensive reviews can be found in [11][12][13]. The conditions under which the soft breaking in the minimal supergravity model are derived are summarized as follows: (i) supersymmetry is broken through a super Higgs effect giving mass to the gravitino through the presence of a hidden sector (singlet); (ii) the hidden and the visible interact only gravitationally; (iii) the Kähler potential is generation independent;…”

Section: Introductionmentioning

confidence: 99%

New Constraints on Dark Matter From CMS and Atlas Data

et al. 2011

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Constraints on dark matter from the first CMS and ATLAS SUSY searches are investigated. It is shown that within the minimal supergravity model, the early search for supersymmetry at the LHC has depleted a large portion of the signature space in dark matter direct detection experiments. In particular, the prospects for detecting signals of dark matter in the XENON and CDMS experiments are significantly affected in the low neutralino mass region. Here the relic density of dark matter typically arises from slepton coannihilations in the early universe. In contrast, it is found that the CMS and ATLAS analyses leave untouched the Higgs pole and the Hyperbolic Branch/Focus Point regions, which are now being probed by the most recent XENON results. Analysis is also done for supergravity models with non-universal soft breaking where one finds that a part of the dark matter signature space depleted by the CMS and ATLAS cuts in the minimal SUGRA case is repopulated. Thus, observation of dark matter in the LHC depleted region of minimal supergravity may indicate non-universalities in soft breaking.

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“…BPB (C 19 H 10 Br 4 S) shows two peaks, one at 436 nm, for the acid form of the indicator and the other at 591 nm, for the basic form. With increase of pH the basic peak at 591 nm increases and the peak at 436 shows a decrease [33]. The indicator was taken in pH 3 phthalate buffer in a quartz cuvette.…”

Section: Uv-vis Studymentioning

confidence: 99%