Leptin concentrations in maternal serum and cord blood in diabetic and nondiabetic pregnancy

OBJECTIVE: The purpose of this study was to examine the relationships between maternal and cord leptin concentrations, maternal and neonatal outcomes, and measures of glycemic control in diabetic and nondiabetic pregnancy.

Maternal imagination: Reconceiving first impressions

The concept of maternal imagination, whereby the disordered thoughts and impressions of pregnant women are used to explain the prevalence of monstrous births, was at its height during the early modern period, albeit it with many prior and subsequent manifestations. Against a more familiar, and enduring, medieval and Renaissance context of supernatural agency at work, the device of MI was seen as a 'naturalistic' model more in keeping with the advent of Enlightenment scientism. Nonetheless, the debate around it was ferocious and indicative more of a masculine anxiety about female desire and generative power than of a concern for impartial explanation. In problematizing a simply descriptive approach to archival material, my purpose is to explore what is at stake in the competing discourses that seem alternately, and even simultaneously, to empower and degrade the place of the mother. What is the unspoken of an historical debate that prefigures our contemporary interest in feminine excess?

Phase-Transfer Catalysis in Segmented Flow in a Microchannel: Fluidic Control of Selectivity and Productivity

Precise control over the interfacial area of aqueous and organic slugs in segmented flow in a microchannel reactor provides an attractive means to optimize the yield and productivity of a phase-transfer-catalyzed reaction. Herein, we report the selective alkylation of phenylacetonitrile to the monoalkylated product in a microchannel of 250-mu m internal diameter operated in a continuous and solvent-free manner in the slug-flow regime. The conversion of phenylacetonitrile increased from 40% to 99% as a result of a 97% larger slug surface-to-volume ratio when the volumetric aqueous-to-organic phase flow ratio was raised from 1.0 to 6.1 at the same residence time. The larger surface-to-volume ratio significantly promoted catalyst phase transfer but decreased selectivity because of the simultaneous increase of the rate of the consecutive reaction to the dialkylated product. There exists all Optimum flow ratio with a maximum productivity. Conversion and selectivity in the microchannel reactor were both found to be significantly larger than in a stirred reactor.

Can China’s Growth be Sustained? A Productivity Perspective

China’s gradual approach to economic transition has resulted in sustained high growth. However, in recent years Chinese economists have increasingly referred to the growth pattern as “extensive,” generated mainly through the expansion of inputs. Our investigation of the Chinese economy during the reform period finds that reform measures often resulted in one-time level effects on total factor productivity (TFP). China now needs to adjust its reform program toward sustained increases in productivity. Market and ownership reforms, and open door policies have improved the conditions under which Chinese firms operate, but further institutional reforms are required to consolidate China’s move to a full-fledged market economy.