Search results for "Ligo"
showing 10 items of 1427 documents
The Sylos Postulate reconsidered
2016
This chapter makes a textual comparison between the 1957 2nd Italian edition and the 1962 1st American edition of Oligopoly and Technical Progress, showing that Sylos Labini added to the later edition some fresh sections concerning new firms’ entry and incumbents’ reaction which partially contradict Modigliani’s 1958 presentation of the Sylos Postulate. The theoretical differences between Sylos Labini and Modigliani with regard to the assumption of constant output are traced back to their different modelling strategies on how to tackle the issue of external firms’ conjectures in determining the long-run oligopoly equilibrium price.
Chamberlin, Edward Hastings
2016
The entry describes the life and analytical contributions of the US economist Edward Chamberlin (1899 -1967). It reconstructs the development of Chamberlin's thought on the issue of monopolistic competition and compares it with the Economics of Imperfect Competition by Joan Robinson.
Paolo Sylos Labini Vindicated
2017
In the first part of our chapter we critically discuss i) Modigliani’s 1958 interpretation of Sylos Labini’s Oligopolio e Progresso Tecnico (1957), ii) the following debate concerning the Sylos Postulate −the assumption according to which “potential entrants behave as though they expected existing firms to adopt the policy most unfavourable to them, namely, the policy of maintaining output while reducing the price (or accepting reductions) to the extent required to enforce such an output policy” − and iii) the incumbent’s choice of productive capacity to install as strategic entry deterrence. In the second part of the chapter we develop a model in which, as in Dixit (1980), there are three …
Involvement of nitrate reductase and pyoverdine in competitiveness of Pseudomonas fluorescens strain C7R12 in soil
2001
ABSTRACT Involvement of nitrate reductase and pyoverdine in the competitiveness of the biocontrol strain Pseudomonas fluorescens C7R12 was determined, under gnotobiotic conditions, in two soil compartments (bulk and rhizosphere soil), with the soil being kept at two different values of matric potential (−1 and −10 kPa). Three mutants affected in the synthesis of either the nitrate reductase (Nar − ), the pyoverdine (Pvd − ), or both (Nar − Pvd − ) were used. The Nar − and Nar − Pvd − mutants were obtained by site-directed mutagenesis of the wild-type strain and of the Pvd − mutant, respectively. The selective advantage given by nitrate reductase and pyoverdine to the wild-type strain was as…
Apical transport of osteopontin is independent of N-glycosylation and sialylation.
2002
Studies of how epithelial surface polarity into apical and basolateral domains is generated and maintained have proposed that carbohydrate modifications serve as apical targeting signals for proteins by interacting with lectin sorters. However, the experimental evidence in support of N-glycans, O-glycans and sialic acids mediating apical transport is still very controversial. This could be partly due to the fact that in most studies exogenously expressed proteins were analysed. One has, therefore, examined the role of carbohydrate moieties in apical targeting of the endogenous secretory protein osteopontin in MDCK cells. It was found, however, that sorting of osteopontin does not require N-…
Effects of silver sulfide nanoparticles on the earthworm Eisenia andrei
2022
The massive production and use of silver nanoparticles (Ag NPs) have led to their increasing release into the environment. Even though the antimicrobial and cytotoxic effects of native nanoparticles have been well studied, the environmental impacts of transformation products such as silver sulfide nanoparticles (Ag
Differentiating Multiple Sclerosis From AQP4-Neuromyelitis Optica Spectrum Disorder and MOG-Antibody Disease With Imaging.
2023
Background and ObjectivesRelapsing-remitting multiple sclerosis (RRMS), aquaporin-4 antibody–positive neuromyelitis optica spectrum disorder (AQP4-NMOSD), and myelin oligodendrocyte glycoprotein antibody–associated disease (MOGAD) may have overlapping clinical features. There is an unmet need for imaging markers that differentiate between them when serologic testing is unavailable or ambiguous. We assessed whether imaging characteristics typical of MS discriminate RRMS from AQP4-NMOSD and MOGAD, alone and in combination.MethodsAdult, nonacute patients with RRMS, APQ4-NMOSD, and MOGAD and healthy controls were prospectively recruited at the National Hospital for Neurology and Neurosurgery (L…
Against cyber-utopianism. Utopian discourse "versus" sociological analysis of the transition to the digital paradigm of the cultural sphere
2015
La cultura ha dejado de ser la esfera social que iluminaba la modernidad. A pesar de su mayor centralidad social y económica propia de la sociedad postfordista, las transformaciones económicas y tecnológicas de los últimos años están cuestionando su propia existencia como esfera autónoma. En este contexto, el discurso ciberutopismo hace una lectura totalmente positiva de estas transformaciones como un empoderamiento del consumidor o del surgimientos de nuevas cadenas de cooperación creativa. Frente a este discurso ideológicamente cargado, es necesaria una ruptura epistemológica y una construcción de un programa de investigación desde la sociología de las artes y la cultura, que evalúe de fo…
A statistical design of experiments for optimizing the MALDI-TOF-MS sample preparation of polymers. An application in the assessment of the thermo-me…
2011
[EN] The sample preparation procedure for MALDI-TOF MS of polymers is addressed in this study by the application of a statistical Design of Experiments (DoE). Industrial poly (ethylene terephthalate) (PET) was chosen as model polymer. Different experimental settings (levels) for matrixes, analyte/matrix proportions and concentrations of cationization agent were considered. The quality parameters used for the analysis were signal-to-noise ratio and resolution. A closer inspection of the statistical results provided the study not only with the best combination of factors for the MALDI sample preparation, but also with a better understanding of the influence of the different factors, individua…
Assessing the MALDI-TOF MS sample preparation procedure to analyze the influence of thermo-oxidative ageing and thermo-mechanical degradation on poly…
2011
[EN] Multiple processing by means of successive injection cycles was used to simulate the thermo-mechanical degradation effects on the oligomeric distribution of PLA under mechanical recycling. Likewise, an accelerated thermal ageing over PLA glass transition was performed in order to simulate its service life. MALDI-TOF MS was used for the analysis and the sample preparation procedure was assessed by means of a statistical Design of Experiments (DoE). The quality effects in use for the analysis were signal-to-noise ratio and Resolution. Different matrixes, analyte/matrix proportions and the use of NaTFA as cationization agent were considered. A deep inspection of the statistical results pr…