186,426 research outputs found
Polygalacturonase regulation in Sclerotinia sclerotiorum: effect of carbon source on the isoenzymatic pattern
No full textCHARACTERIZATION OF 2 SCLEROTINIA-SCLEROTIORUM POLYGALACTURONASES WITH DIFFERENT ABILITIES TO ELICIT GLYCEOLLIN IN SOYBEAN
No full textTwo endo-polygalacturonase isoenzymes (PG-II and PG-IV), with masses of 34 and 30 kDa respectively, were purified from soybean hypocotyls infected by Sclerotinia sclerotiorum. The pH optimum for both isoenzymes was about 4.6, but PG-IV exhibited a broader range of pH activity. PG-IV showed a much higher affinity for pectin than did PG-II. PG-II hydrolyzed polygalacturonic acid in a more random fashion than PG-IV. Oligouronides produced by PG-II showed a higher phytoalexin elicitor activity. PG-IV produced a large degree of maceration of soybean hypocotyls releasing a significant amount of uronides. The properties of PG-II and PG-IV are discussed in relation to the different ability of the two isoenzymes to elicit glyceollin in soybean
INHIBITION OF SOME ROT FUNGI POLYGALACTURONASES BY ALLIUM-CEPA L AND ALLIUM-PORRUM L EXTRACTS
No full textExtracts of Allium cepa and A. porrum contain factors that inhibit to various extents polygalacturonases (PGs) produced in vitro by Sclerotinia sclerotiorum, Botrytis cinerea, Fusarium moniliforme, Phoma terrestris, Sclerotium cepivorum, Macrophomina phaseolina, Didymella bryoniae and Phoma lycopersici. The PG inhibition rank changed using leek or onion extract. The inhibition factors are possibly proteins, do not present particular specificity and act against PGs of fungi pathogens and non pathogens for these plant species
Sperimentazione di ricerca per una formazione situata in un Master di didattica delle scienze: il caso del tempo
No full textTOLERANCE OF SCLEROTINIA-SCLEROTIORUM TO GLYCEOLLIN-I A SOYBEAN PHYTOALEXIN
No full textGlyceollin I was fungistatic rather than fungicidal toward Sclerotinia sclerotiorum. Within the mycelial mat apical cells were more vulnerable than mature cells. S. sclerotiorum removed large amounts of glyceollin from solution by a non-energy-requiring process
Educational Context and Entrepreneurial Intentions of University Students
No full textResearch on organizational slack, which has focused mainly on its effect in large, publicly traded firms and on transitional economies, has found that slack functions as a buffer in periods of crisis. However, little work has been done on the value of slack resources for smaller firms in mature industries. This study contributes to the resource-based literature with a quantitative analysis of a broad sample of Italian SMEs that operate in the traditional ‘Made in Italy’ industries. The purpose of the paper is to use longitudinal data from before and after the 2008 world financial crisis to determine whether slack resources drive growth and profitability in organizations with limited resources that operate in mature industries in periods of recession. The results of two-stage least squares regression indicate that, similar to their larger counterparts, small firms must secure high levels of profitability in order to achieve sound growth during recessions. Potential financial slack is equally important in driving profitability in these periods, although it is not related to higher growth. Investing in R&D does not affect small firms’ ability to be profitable and grow during recessions
The efficient identification of horizontal meandering in raw ultrasonic anemometer data
No full textThis paper shows a new experimental method for the detection and identification of sub-mesoscale low-frequency components, in particular horizontal meandering, in raw data from three-axial ultrasonic anemometers and other high resolution, high sampling-rate three-dimensional wind sensors. The proposed method is a combination of autocorrelation-based detection and FFT-based filtering, well known in literature. The results of the application of the described method to a sample of hourly raw data files are shown as well. The method can be used as a building block for eddy covariance and other data processing procedures as well as in all the situations where very short time scales (about 10s) are relevant, such as in odour or toxic chemical dispersion
Gradient estimates for solutions of parabolic differential equations degenerating at infinity
No full textFor p ∈ (1,+∞) we derive a weighted Lp estimate for the (spatial) gradient of the solution u of a degenerate parabolic differential equation. Here the underlying domain ω ⊂ Rn, n ≥ 2, is unbounded and the equation may degenerate only at infinity along some unbounded branch of ω. Our estimate is strictly related with the still-open problem of giving a concrete characterization of the interpolation space between W2,p(ω) and Lp(ω) to which the (spatial) gradient of u belongs
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