44,814 research outputs found
Shivji, Issa G. Law, State and the Working Class in Tanzania, c. 1920-1964
No full textGutkind Peter C. Shivji, Issa G. Law, State and the Working Class in Tanzania, c. 1920-1964. In: Cahiers d'études africaines, vol. 27, n°107-108, 1987. Mémoires, Histoires, Identités. pp. 450-452
Compact Toeplitz Operators for Weighted Bergman Spaces on Bounded Symmetric Domains
No full textLet Omega subset of C(d) be an irreducible bounded symmetric domain of type (r, a, b) in its Harish-Chandra realization. We study Toeplitz operators T(g)(v) with symbol g acting on the standard weighted Bergman space H(v)(2) over Omega with weight nu. Under some conditions on the weights nu and nu (0) we show that there exists C(nu, nu (0)) > 0, such that the Berezin transform (g) over tilde nu 0 of g with respect to H(nu 0)(2) satisfies: parallel to(g) over tilde (nu 0)parallel to(infinity) C where C is a constant depending on (r, a, b).DFG (Deutsche Forschungsgemeinschaft
Evolution of the G+C content frontier in the rat cytomegalovirus genome
No full textWithin the 230138 bp of the rat cytomegalovirus (RCMV) genome, the G+C content changes abruptly at position 142644, constituting a G+C content frontier. To the left of this point, overall G+C content is 69.2%, and to the right it is only 47.6%. A region of extremely low G+C content (33.8%) is found in the 5 kb immediately to the right of the frontier, in which there are no predicted coding sequences. To the right of position 147501, the G+C content rises and predicted coding sequences reappear. However, these genes are much shorter (average 848bp, 50% G+C) than those in the left two-thirds of the genome (average 1462bp, 70% G+C). Whole genome alignment of several viruses indicates that the initial ultra-low G+C region appeared in the common ancestor of the genera Cytomegalovirus and Muromegalovirus, and that the lowering of G+C in the right third has been a subsequent process in the lineage leading to RCMV. The left two-thirds of RCMV has stop codon occurrences at 67.5% of their expected level, based on a modified Markov chain model of stop codon distribution, and the corresponding figure for the right third is 78%. Therefore, despite heavy mutation pressure, selective constraint has operated in the right third of the RCMV genome to maintain a degree of gene length unusual for such low G+C sequences
Data for: A comparative adsorption study of benzophenone-3 onto synthesized lipophilic organosilicate, Laponite and montmorillonite
No full textIn this study, the adsorption of a hydrophobic molecule, benzophenone-3 (BZ-3) was investigated onto three adsorbents: synthesized lipophilic organosilicate (OSL), Laponite (Lap) and montmorillonite (Mt). A comparative study for all adsorbents with batch adsorption experiments was achieved to determine the optimal conditions. The effects of the main experimental parameters were determined such as solvent, pH, temperature, initial concentration of BZ-3 and contact time. The adsorption capacity was evaluated by means of HPLC analysis equipped with UV detection and the adsorbent - BZ-3 complexes were characterized by means of Dynamic Light Scattering (DLS) analysis and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR - FTIR) spectroscopy. Finally, the adsorption isotherm equilibrium was described according to Langmuir, Freundlich and Temkin models. The results showed that optimal value of the adsorbed BZ-3 for all adsorbents was found at pH 10, at 38 °C, with BZ-3 concentration of 2.5 g/L during 24 h of contact time. The results obtained showed a promising capacity of the OSL to adsorb BZ-3 (340 mg of BZ-3/g of adsorbent) compared to Lap (137 mg/g) and Mt (192.3 mg/g). Langmuir model fitted the best with OSL and Mt adsorption while Freundlich model fitted the best with Lap adsorption
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Control of transient power during unintentional islanding of microgrids
No full textIn inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone mode and to transfer seamlessly between the two modes. In grid-connected mode, the inverters control the amount of power injected into the grid. In stand-alone mode, however, the inverters control the island voltage while the output power is dictated by the load. This can be achieved using the droop control. Inverters can have different power set-points during grid-connected mode but in stand-alone mode they all need their power set-points to be adjusted according to their power ratings. However, during sudden unintentional islanding (due to loss of mains), transient power can flow from inverters with high power setpoints to inverters with low power set-points, which can raise the DC link voltage of the inverters causing them to shut down. This paper investigates the transient circulating power between paralleled inverters during unintentional islanding and proposes a controller to limit it. The controller monitors the DC link voltage and adjusts the power set-point in proportion to the rise in the voltage. A small signal model of an islanded microgrid is developed and used to design the controller. Simulation and experimental results are presented to validate the design
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Use of Mg/Ca modified biochars to take up phosphorus from acid-extract of incinerated sewage sludge ash (ISSA) for fertilizer application
No full textRecovery of phosphorus (P) from incinerated sewage sludge ash (ISSA) by biochar is an attractive solution for mitigating the P scarcity and transferring waste to resources. This work used Mg/Ca-modified biochars to take up P from the acid-extract from ISSA at low pH (<2), which simplified the previous P recycling process. The hypothesis is to produce a P-enriched post-sorption biochar that can be directly applied as a P fertilizer. Wastes of peanut shell and sugarcane bagasse were used to synthesize Mg/Ca-modified biochars at pyrolysis temperatures of 450 °C, 700 °C and 850 °C. Preliminary results indicated Mg-modified sugarcane bagasse biochar pyrolysed at 700 °C produced optimal P-absorption. This biochar was positively charged and had a high specific surface area (1440 m2/g), consistent with a layered porous structure. The optimal biochar showed rapid adsorption of P which could be described by the pseudo-second-order model. Successful adsorption of P from the acid-extract by the optimal biochar was mainly due to chemical precipitation and its adsorption capacity is 129.79 mg P/g biochar.</p
Acute Ethanol Administration Rapidly Increases Phosphorylation of Conventional Protein Kinase C in Specific Mammalian Brain Regions in Vivo
No full textBackground
Protein kinase C (PKC) is a family of isoenzymes that regulate a variety of functions in the central nervous system including neurotransmitter release, ion channel activity, and cell differentiation. Growing evidence suggests that specific isoforms of PKC influence a variety of behavioral, biochemical, and physiological effects of ethanol in mammals. The purpose of this study was to determine whether acute ethanol exposure alters phosphorylation of conventional PKC isoforms at a threonine 674 (p-cPKC) site in the hydrophobic domain of the kinase, which is required for its catalytic activity.
Methods
Male rats were administered a dose range of ethanol (0, 0.5, 1, or 2 g/kg, intragastric) and brain tissue was removed 10 minutes later for evaluation of changes in p-cPKC expression using immunohistochemistry and Western blot methods.
Results
Immunohistochemical data show that the highest dose of ethanol (2 g/kg) rapidly increases p-cPKC immunoreactivity specifically in the nucleus accumbens (core and shell), lateral septum, and hippocampus (CA3 and dentate gyrus). Western blot analysis further showed that ethanol (2 g/kg) increased p-cPKC expression in the P2 membrane fraction of tissue from the nucleus accumbens and hippocampus. Although p-cPKC was expressed in numerous other brain regions, including the caudate nucleus, amygdala, and cortex, no changes were observed in response to acute ethanol. Total PKC? immunoreactivity was surveyed throughout the brain and showed no change following acute ethanol injection
Private investment in guinea, does macro-instability matter? A comparative analysis
No full textThis paper examines empirically the link between macro-instability and private investment rate in Guinea, in comparison with WAEMU countries . Notwithstanding the caution imposed by data and methodological limitations in interpreting the results, the paper shows that macroeconomic instability is, in general, higher in Guinea than WAEMU countries. Consequently, macroeconomic uncertainties are cause of concern. Using a panel data approach, the findings suggest that the negative effects of relative price volatility (mainly inflation, real effective exchange rates) expected in theory, do not occur when small deviations are combined with competitiveness, resulting from a declining real effective exchange rate. In addition, the positive effect of foreign exchange reserves on the private investment rate supports the view that the availability of foreign exchange reserves is critical in a fixed exchange rate regime as that of WAEMU, as well as in an imperfect floating exchange rate regime as that of Guinea. While the panel data approach shows no evidence of negative impact of macroeconomic uncertainties, it suggests further analysis to explore the robustness of this result. A time series approach is carried out for Guinea, with regard to this purpose. As mentioned above, Guinea registers higher level of macroeconomic instability, compared to WAEMU countries. Using a single error correction model, the counter-intuitive impact of macroeconomic instability variables (measured by the real effective exchange rate, inflation rate and the terms of trade) persists. Given the dominant share of the mining sector in the private investment figures, the findings may be misleading as this sector may be protected from the wrong market signals resulting from the increasing macro-instability. However, capturing such an ‘enclave-effect’ is unfortunately limited by the lack of disaggregated investment data by sector. Finally, the results indicate a negative (indirect) impact of macroeconomic instability (measured by the real lending rate and the flow of credit to the economy) on the private sector investment. They suggest additional efforts to improve the overall macroeconomic context and especially, an in-depth openness of the financial sector, to diversify credit instruments to the private sector in Guinea.Guinea, Macro-instability, Inflation, Private investment
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