The lac operon of Escherichia coli can exhibit bistability. Early studies showed that bistability occurs during growth on TMG/succinate and lactose+glucose, but not during growth on lactose. More recently, studies with lacGFP-transfected cells show bistability during growth on TMG/succinate, but not during growth on lactose and lactose+glucose. In the literature, these results are invariably at...

As mergers become increasingly important in the financial services industry, the need for proper sensitivity analysis to assess the financial impact of the merger is essential. Unlike industrial mergers, there is almost always initial dilution in a bank merger. This is because of the homogenous nature of bank P/E ratios and the high premium over book value that is typically paid. The problem of...

The effect of Helium (He) dilution on optical and photoelectric properties of hydrogenated amorphous silicon (a-Si:H) thin film samples prepared at substrate temperature of 75◦C with increased growth rate by plasma-enhanced chemical vapor deposition (PECVD) technique is studied using spectrophotometric (SP) and steady-state photocarrier grating techniques (SSPG). The values of refractive index,...

0305-7364/0 * For corre bcgn.grignon. There is still disagreement about whether crop growth rate or soil nitrate concentration control nitrogen absorption by crops under ®eld conditions. The in ̄uence of these factors on the control of N uptake rate was examined in the absence of water stress, using data on dry matter production, above-ground nitrogen accumulation and soil nitrate concentration ...

Standardized sperm concentration and volume:volume extension were compared as dilution rates for canine semen freezing. Six proven stud dogs were submitted to two seminal collections by manual stimulation. Semen was evaluated and extended in tris plus egg-yolk and glycerol according to two different dilution rates. The first one was based on a standardized sperm concentration of 200x10 spermato...

The PC3 gene is transiently expressed during neurogenesis in precursor cells of the telencephalic ventricular/subventricular zone, and is rapidly downregulated before cell migration and differentiation. It is thought to have a role in controlling cell proliferation, but its precise function is not known. Here we present evidence that PC3, when overexpressed in vitro by retroviral-mediated gene ...

Quantitative predictions for the spread of mutations in bacterial populations are essential to interpret evolution experiments and to improve the stability of synthetic gene circuits. We derive analytical expressions for the suppression factor for beneficial mutations in populations that undergo periodic dilutions, covering arbitrary population sizes, dilution factors, and growth advantages in ...

This study was carried out to determine the optimum frequency of semen collections, dilution rate , and artificial insemination dose of Domyati duck semen in order to set up the commercial semen quality which could be applied to the conservation of genetic resources, breeding, and commercial production in Domyati ducks. In experiment 1, the three levels of the frequency of semen collections (on...