The adsorption of albumin and fibrinogen to gold metal using proteins radiolabeled with 125I is reported. Previous studies indicated that the interaction of the metal surface with free 125I− ion, present in trace amounts during protein adsorption experiments, resulted in substantial uptake, thus giving erroneously high estimates of adsorbed protein. Different approaches were investigated either to suppress the sorption of 125I− ion to gold or to differentiate between the sorption of labeled protein and 125I−. In the latter case an appropriate correction to the radioactivity on the surface should allow a valid estimate of protein adsorption. It was found that the addition of small amounts of nonradioactive iodide to the protein solution effectively suppresses the binding of 125I− ion (present in trace amounts relative to nonradioactive iodide) to the gold surface. An alternative approach involving pre-exposure to sodium iodide was not effective in suppressing the sorption of 125I− to gold. It was also found that treatment of gold surface with SDS is not 100% efficient in eluting adsorbed protein. 相似文献
La2NiMnO6 samples were prepared by the solid state reaction method, and their crystal structure and soft magnetic properties were measured. Magnetic measurements show that the magnetic loss of the sample decreases with increasing frequency, and further magnetic measurements indicate that the hysteresis loss of the sample is frequency dependent. We present a model that explains the experimental phenomenon that the increase in frequency found in the sample leads to a decrease in the hysteresis loss. 相似文献
Quantum contextuality is a fundamental feature of quantum theory, which has been demonstrated in spatial scenario theoretically and experimentally. In this paper, we proposed a scheme to test temporal contextuality with a two-time entangled history state in the optical system. The contextuality is generated from the sequential projective measurements and revealed by the violation of the temporal Klyachko-Can-Binicioglu-Shumovsky inequality, which is obeyed by the noncontextual hidden variable theories. Compared with the existing schemes for testing quantum contextuality, ours can give the same physical result without collapsing the state. From the point of view of experiment, it is easier to implement as the measurement is projective measurement, and it can be extended to multiple time nodes.
In sinusoidal phase modulating laser diode (LD) interferometer, the injection current of the LD is sinusoidally modulated to realize the modulation of the wavelength. However, the light intensity of LD is also modulated, which affects the measurement accuracy. An all-fiber sinusoidal phase modulating LD interferometer for real-time displacement measurement is proposed where the influence of the intensity modulation is eliminated with a new algorithm. It is made clear that an optimal depth of the sinusoidal phase modulation (SPM) exists in the algorithm. Moreover, the SPM depth is locked at the optimal value by controlling the injection current with a feedback control system. The feasibility of the proposed interferometer for displacement measurement is verified by experiments. 相似文献