We evaluated the variability in the amount of protein adsorbed onto the surface of individual wells of an assortment of microtitre plates by use of procedures involving enzyme-protein conjugates. Coefficients of variation in adsorbed protein ranged from 5.2 to 29.5%. Microtitre plates show a distinct "edge effect"; wells at the edges of a plate adsorb more protein than those in the interior, wh...

A scattering mechanism stemming from the Stark-shift of energy levels by electric fields due to interface roughness in semiconductor quantum wells is identified. This scattering mechanism feeds off interface roughness and electric fields and modifies the well known “sixth-power” law of electron mobility degradation. This work first treats Stark-effect scattering in rough quantum wells as a pert...

of the Geneva model. As for the Wells score used in our study, we think that neither dichotomised nor trichotomised scores make too much sense if they are combined with a D-dimer test. It must be noted that positive D-dimer test allows the shifting of some patients from the ‘‘unlikely’’ PE arm of the dichotomised Wells score back to the ‘‘likely’’ arm. Since only few COPD studies related to the...

We present new time-resolved measurements that demonstrate the effect of injected carrier densities on carrier–carrier scattering rates of highly nonequilibrium carrier distributions in the p-doped Al Ga As/GaAs quantum wells with well 0.32 0.68 10 22 width of 5 and 3 nm. The spectra at high densities ( $ 10 cm ) demonstrate that the initially narrow electron distribution is altered in a time l...

A solid phase radioimmunoassay for the detection of anti-insulin antibodies has been developed and evaluated. After coating round-bottomed wells of polyvinyl chloride with porcine monocomponent insulin, 50 microliters of serum from either insulin-treated diabetics or non diabetic controls was added to the wells, followed by the addition of 125I-protein A, and then the radioactivity of the bound...

This research was sponsored by a grant from the Center for Rural Pennsylvania, a legislative agency of the Pennsylvania General Assembly. The Center for Rural Pennsylvania is a bipartisan, bicameral legislative agency that serves as a resource for rural policy within the Pennsylvania General Assembly. It was created in 1987 under Act 16, the Rural Revitalization Act, to promote and sustain the ...

The increased demand for oil and gas places a burden on lands set aside for natural resource conservation. Oil and gas development alters the environment locally and on a much broader spatial scale depending on the intensity and extent of mineral resource extraction. The current increase in oil and gas exploration and production in the United States prompted an update of the number of pipelines...

In this paper we present an investigation of the exciton capture process in GaAs/Al.jGa.7A.s quantum wells using a picosecond time-resolved photoluminescence technique. We demonstrate that there are significant differences in the capture mechanism for narrow quantum wells in comparison to bulk material. In particular the initial capture efficiency is shown to increase with temperature. This beh...

Testing of 1701 water wells in northeastern Pennsylvania shows that methane is ubiquitous in groundwater, with higher concentrations observed in valleys vs. upland areas and in association with calcium-sodium-bicarbonate, sodium-bicarbonate, and sodium-chloride rich waters--indicating that, on a regional scale, methane concentrations are best correlated to topographic and hydrogeologic features...

In order to clarify the reasons for the fairly poor electroluminescence (EL) performance of semipolar LED structures grown on patterned sapphire wafers, we have analyzed both, pure photoluminescence (PL) test structures without doping only containing 5 GaInN quantum wells and full EL test structures, all emitting at a wavelength of about 510 nm. Evaluating the PL intensity over a wide range of ...