Studies on the Localization and Mechanism of Alkaline Metal Activation of Protein Synthesis

Localization and mechanism of rat liver protein synthesis by alkali metals and ammonium ion

Higher loop corrections to a Schwinger--Dyson equation

We consider the effects of higherloop corrections to a Schwinger--Dyson equations for propagators. This is made possible by the efficiency of the methods we developed in preceding works, still using the supersymmetric Wess--Zumino model as a laboratory. We obtain the dominant contributions of the three and four loop primitive divergences at high order in perturbation theory, without the need for their full evaluations. Our main conclusion is that the asymptotic behavior of the perturbative series of the renormalization function remains unchanged, and we conjecture that this will remain the case for all finite order corrections.Comment: 12 pages, 2 imbedded TiKZ pictures. A few clarifications matching the published versio

Ethics in action: Consent-gaining interactions and implications for research practice

This article deals with the topic of social psychological research methods in practice, by examining how informed consent is gained from research participants. In most research, the consent-gaining process is hidden from analytic scrutiny and is dealt with before data collection has begun. In contrast, conversation analytic research, which records interactional encounters from beginning to end, enables examination of this methodological 'black box'. We explored how 'requests' to consent in research played out across different institutional settings. We found that participants had to 'opt-out' of a research process that was already underway. Consent-gaining sequences constrained opting out in two ways: (1) because research activity was already underway, it must be stopped affirmatively by participants; (2) consent-gaining turns were tilted in favour of continued participation, making opting out a dispreferred response. We also found a mismatch between what ethics guidelines specify about consent-gaining 'in theory' and what actually happens 'in practice'. Finally, we make suggestions about interventions in and recommendations for existing practice to best achieve informed consent. © 2012 The British Psychological Society

An off-shell I.R. regularization strategy in the analysis of collinear divergences

We present a method for the analysis of singularities of Feynman amplitudes based on the Speer sector decomposition of the Schwinger parametric integrals combined with the Mellin-Barnes transform. The sector decomposition method is described in some details. We suggest the idea of applying the method to the analysis of collinear singularities in inclusive QCD cross sections in the mass-less limit regularizing the forward amplitudes by an off-shell choice of the initial particle momenta. It is shown how the suggested strategy works in the well known case of the one loop corrections to Deep Inelastic Scattering.Comment: 25 pages, 3 figure

Fine Structure of the Oocyst Walls of \u3ci\u3eIsospora serini\u3c/i\u3e and \u3ci\u3eIsospora canaria\u3c/i\u3e and Excystation of \u3ci\u3eIsospora serini\u3c/i\u3e From the Canary, \u3ci\u3eSerinus canarius\u3c/i\u3e L.

Oocysts of Isospora serini and Isospora canaria, from the canary Serinus canarius, were broken, added to a cell suspension, fixed in Karnovsky\u27s fluid, and studied in the electron microscope. The oocyst wall of each species had an electron- lucent inner layer, a more osmiophilic middle layer and an outer layer of electron-lucent (I. serini) or electron-dense material interspersed with some electron-lucent material (I. canaria). A few, relatively large lipid-like bodies were present in the outer or middle layer of the oocyst wall of I. canaria. As many as 9 membranes were present in the oocyst wall of I. canaria and 3 in that of I. serini. When exposed to a trypsin-sodium taurocholate fluid, sporozoites of I. serini excysted from 5-month-old sporocysts in vitro, but not from sporocysts stored for more than 6 months. No excystation occurred in l5-month-old I. canaria sporocysts. Similarities and differences in excystation between I. serini and other Isospora, Eimeria, and Sarcocystis species are discussed

Amplified insert assembly: an optimized approach to standard assembly of BioBrickTM genetic circuits

A modified BioBrick™ assembly method was developed with higher fidelity than current protocols. The method utilizes a PCR reaction with a standard primer set to amplify the inserted part. Background colonies are reduced by a combination of dephosphorylation and digestion with DpnI restriction endonuclease to reduce vector and insert background respectively. The molar ratio of the insert to vector in the ligation was also optimized, with the accuracy of the transformed construct approaching 100%

Representativeness of meridional hydrographic sections in the western South Atlantic

Many studies of the oceanic circulation are based on data collected during quasi-synoptic hydrographic surveys. After spatial averaging, to filter out the effects of mesoscale variability, it is often explicitly or implicitly assumed that the synoptic hydrographic gradients are representative of a quasi-steady mean state. Climatological tracer fields and float data at the depth of the North Atlantic Deep Water in the western South Atlantic (Brazil Basin) support the notion of a quasi-steady mean circulation characterized by alternating bands of primarily zonal flow with meridional scales of several hundreds of km. Visually, the mean circulation appears to dominate three samples of the large-scale meridional-density-gradient field taken between 1983 and 1994. A quantitative comparison reveals, however, that the baroclinic temporal variability of the zonal velocities is of the same magnitude as the mean and is associated with similar spatial scales. The synoptic geostrophic flow field is, therefore, only marginally representative of the mean state. Thus, the data do not support one of the central assumptions of reference-velocity methods, such as linear box-inverse models and the β-spiral, because baroclinic temporal variability renders the equation systems underlying these methods inconsistent. A modal decomposition of the temporally varying baroclinic zonal velocity field in the Brazil Basin indicates that the first two dynamical modes dominate, accounting for ≈90% of the rms velocities. The residual flow field that remains after removing the first two baroclinic modes from the three synoptic samples is dominated by the mean circulation. However, its magnitude is not sufficient to account for the float and tracer observations. Therefore, it is necessary to determine the projection of the mean zonal velocities onto the barotropic and the first two baroclinic modes in order to diagnose fully the mean zonal circulation in the western South Atlantic. There is evidence that the representativeness of synoptic hydrographic sections in other regions may be similarly marginal