357 research outputs found
Study of the liquid vapor equilibrium in the bromine-hydrobromic acid-water system
A glass ebullioscope was built and at atmospheric pressure, liquid-vapor equilibria relative to the Br2-HBr-H2O system, in the concentration range of interest for evaluation of the Mark 13 cycle was studied. Measurements were performed for the brome-azeotrope (HBr-H2O) pseudo-binary system and for the ternary system at temperatures lower than 125 C and in the bromine concentration range up to 13% wt
More On Pure Gravity with a Negative Cosmological Constant
We identify an ambiguity in the Chern-Simons formulation of three-dimensional
gravity with negative cosmological constant that originates in an outer
automorphism of the Lie algebra sl(2,R). It has important consequences for the
stability of the theory in a space-time with boundary. We revisit the classical
equivalence of three-dimensional gravity with a boundary Liouville theory both
on and off the mass shell. Moreover, we provide further details on the quantum
equivalence, the gauge symmetry that renders the spectrum diagonal, as well as
the relation between asymptotically AdS3 metrics and polar boundary conditions.
We thus set the proposal that the Liouville conformal field theory serves as a
definition of a unitary theory of pure gravity in three dimensions with
negative cosmological constant on a more stable footing.Comment: 26 pages, 1 figur
Export Competitiveness and Trade Agreements: Analysis and Insights from Israelâs Experience
Israeli manufactured export performance has been on a growth path for the past two decades. This growth is partly due to the continuing shift in Israeli export specialization patterns from traditional products towards technology-intensified exports. However, Israelâs strong export competitiveness also derives from proliferating free trade agreements (FTAs) with its trading partners, especially the European Union (EU). This paper analyzes export statistics to provide data validating the positive impact of recent FTAs on Israelâs export comparative advantages across all sectors between 1995 and 2015. It employs an econometric framework to examine stability and specialization trends, as well as convergence. Furthermore, the authors add to the literature by performing a survival analysis, using the Kaplan-Meier Survival Rate model, to identify particular Israeli export sectors that have benefited from a longer pe- riod of competitive advantage than other sectors due to the EU-Israel Association Agreement
Small bowel involvement is a prognostic factor in colorectal carcinomatosis treated with complete cytoreductive surgery plus hyperthermic intraperitoneal chemotherapy
<p>Abstract</p> <p>Background</p> <p>Cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC) is a promising treatment for patients with peritoneal carcinomatosis (PC). Our objective was to identify new prognostic factors in patients with PC from colorectal cancer treated with this procedure.</p> <p>Methods</p> <p>All patients with PC from colorectal cancer treated by HIPEC from January 2000 to December 2007 were prospectively included. The tumor extension was assessed by the Peritoneal Cancer Index (PCI) and the residual disease was recorded using the completeness cytoreductive score (CCs). All clinical and treatment data were computed in univariate and multivariable analyses using survival as primary end point.</p> <p>Results</p> <p>We carried out 51 complete procedures in 49 consecutive patients. The mean PCI was 10. The allocation of CCs was: CC-0 = 37, CC-1 = 14. The five-year overall and progression-free survival rate were 40% and 20%, respectively. Several prognostic factors for survival were identified by univariate analysis: PCI < 9 (<it>P </it>< 0.001), CC-0 vs. CC-1 (<it>P </it>< 0.01) and involvement of area 4 (<it>P </it>= 0.06), area 5 (<it>P </it>= 0.031), area 7 (<it>P </it>= 0.014), area 8 (<it>P </it>= 0.022), area 10 (<it>P </it>< 0.0001), and area 11 (<it>P </it>= 0.02). Only the involvement of the distal jejunum (area 10) was significant in the multivariable analysis (<it>P </it>= 0.027).</p> <p>Conclusions</p> <p>We demonstrated that the involvement of area 10 (distal jejunum of the PCI score) was an independent factor associated with poor prognosis.</p
Effect of microbial activity on penetrometer resistance and elastic modulus of soil at different temperatures
We explore the effect of microbial activity stimulated by root exudates on the penetrometer resistance of soil and its elastic modulus. This is important because it is a measure of the mechanical strength of soil and it correlates closely with the rate of elongation of roots. A sandy soil was incubated with a synthetic root exudate at different temperatures, for different lengths of time and with selective suppression of either fungi or bacteria. The shape of the temperature response of penetrometer resistance in soil incubated with synthetic exudate was typical of a poikilothermic temperature response. Both penetrometer resistance and small strain shear modulus had maximum values between 25 and 30°C. At temperatures of 20°C and less, there was little effect of incubation with synthetic root exudate on the small strain shear modulus, although penetrometer resistance did increase with temperature over this range (4â20°C). This suggests that in this temperature range the increase in penetrometer resistance was related to a greater resistance to plastic deformation. At higher temperatures (> 25°C) penetrometer resistance decreased. Analysis of the DNA sequence data showed that at 25°C the number of Streptomyces (Gramâpositive bacteria) increased, but selective suppression of either fungi or bacteria suggested that fungi have the greater role with respect to penetrometer resistance
Visualization of grapevine root colonization by the Saharan soil isolate Saccharothrix algeriensis NRRL B-24137 using DOPE-FISH microscopy
Background and aim There is currently a gap of
knowledge regarding whether some beneficial bacteria
isolated from desert soils can colonize epi- and
endophytically plants of temperate regions. In this
study, the early steps of the colonization process of
one of these bacteria, Saccharothrix algeriensis NRRL
B-24137, was studied on grapevine roots to determine
if this beneficial strain can colonize a non-natural host
plant. An improved method of fluorescence in situ
hybridization (FISH), the double labeling of oligonucleotide
probes (DOPE)-FISH technique was used to
visualize the colonization behavior of such bacteria as well as to determine if the method could be used to
track microbes on and inside plants.
Methods A probe specific to Saccharothrix spp. was
firstly designed. Visualization of the colonization behavior
of S. algeriensis NRRL B-24137 on and inside
roots of grapevine plants was then carried out with
DOPE-FISH microscopy.
Results The results showed that 10 days after inoculation,
the strain could colonize the root hair zone, root
elongation zone, as well as root emergence sites by
establishing different forms of bacterial structures as
revealed by the DOPE-FISH technique. Further observations
showed that the strain could be also endophytic
inside the endorhiza of grapevine plants.
Conclusions Taking into account the natural niches of
this beneficial strain, this study exemplifies that, in
spite of its isolation from desert soil, the strain can
establish populations as well as subpopulations on and
inside grapevine plants and that the DOPE-FISH tool
can allow to detect it
Productive and vegetative performance of peach trees grafted on six rootstocks in a replanting area
AlteraçÔes metabólicas em plantas de feijão originadas de sementes microbiolizadas por Pseudomonas sp. e inoculadas com Xanthomonas axonopodis pv. phaseoli
Potencialidade de um actinomiceto de rizosfera de tomateiro como agente de biocontrole de doenças
- âŠ