1,557 research outputs found
Biodegradation of phenoxyacetic acid in soil by Pseudomonas putida PP0301(pR0103), a constitutive degrader of 2, 4âdichlorophenoxyacetate
The efficacy of using genetically engineered microbes (GEMs) to degrade recalcitrant environmental toxicants was demonstrated by the application of Pseudomonas putida PP0301(pR0103) to an Oregon agricultural soil amended with 500 u.g/g of a model xenobiotic, phenoxyacetic acid (PAA). P. putida PP0301(pR0103) is a constitutive degrader of 2, 4âdichlorophenoxyacetate (2, 4âD) and is also active on the nonâinducing substrate, PAA. PAA is the parental compound of 2, 4âdichlorophenoxyacetic acid (2, 4âD) and whilst the indigenous soil microbiota degraded 500 ng/g 2, 4âD to less than 10 Jâg/g, PAA degradation was insignificant during a 40âday period. No significant degradation of PAA occurred in soil inoculated with the parental strain P. putida PP0301 or the inducible 2, 4âD degrader P. putida PP0301(pR0101). Moreover, coâamendment of soil with 2, 4âD and PAA induced the microbiota to degrade 2, 4âD; PAA was not degraded. P. putida PP0301â(pR0103) mineralized 500âÎg/g PAA to trace levels within 13 days and relieved phytotoxicity of PAA to Raphanus sativus (radish) seeds with 100% germination in the presence of the GEM and 7% germination in its absence. In unamended soil, survival of the plasmidâfree parental strain P. putida PP0301 was similar to the survival of the GEM strain P. putida PP0301(pR0103). However, in PAA amended soil, survival of the parent strain was over 10 000âfold lower (< 3 colony forming units per gram of soil) than survival of the GEM strain after 39 days.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75471/1/j.1365-294X.1992.tb00160.x.pd
Hydrocarbon plumbing systems of salt minibasins offshore Angola revealed by three-dimensional seismic analysis
Ligandâinduced donor state destabilisation â a new route to panchromatically absorbing cu(I) complexes
The intense absorption of light to covering a large part of the visible spectrum is highly desirable for solar energy conversion schemes. To this end, we have developed novel anionic bis(4 H âimidazolato)Cu(I) complexes (cuprates), which feature intense, panchromatic light absorption properties throughout the visible spectrum and into the NIR region with extinction coefficients up to 28,000â
M â1 âcm â1 . Steadyâstate absorption, (spectro)electrochemical and theoretical investigations reveal low energy (Vis to NIR) metalâtoâligand chargeâtransfer absorption bands, which are a consequence of destabilized copperâbased donor states. These highâlying copperâbased states are induced by the Ïâdonation of the chelating anionic ligands, which also feature low energy acceptor states. The optical properties are reflected in very low, copperâbased oxidation potentials and three ligandâbased reduction events. These electronic features reveal a new route to panchromatically absorbing Cu(I) complexes.Cu(I) and two chelating , anionic polymethineâtype ligands form a novel type of photoactive cuprate. The ligands induce the destabilisation of the Cu(I)âbased donor states and act themselves as acceptors. This leads to an unusually broad and intense absorption spectrum with metalâtoâligand chargeâtransfer transitions from the visible to nearâinfrared region. imag
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Alterations in Event Related Potentials (ERP) associated with tinnitus distress and attention
Tinnitus related distress corresponds to different degrees of attention paid to the tinnitus. Shifting attention to a signal other than the tinnitus is therefore particularly difficult for patients with high tinnitus related distress. As attention effects on Event Related Potentials (ERP) have been shown this should be reflected in ERP measurements (N100, phase locking). In order to prove this hypothesis single sweep ERP recordings were obtained in 41 tinnitus patients as well as 10 control subjects during a period of time when attention was shifted to a tone (attended) and during a second phase (unattended) when they did not focus attention to the tone. Whereas tinnitus patients with low distress showed a significant reduction in both N100 amplitude and phase locking when comparing the attended and unattended measurement condition a group of patients with high tinnitus related distress did not show such ERP alterations. Using single sweep ERP measurements the results of our study show, that attention in high tinnitus related distress patients is captured by their tinnitus significantly more than in low distress patients. Furthermore our results provide the basis for future neurofeedback based tinnitus therapies aiming at maximizing the ability to shift attention away from the tinnitus. © 2008 The Author(s)
Ator e/ou animador a serviço da representação
Este artigo propĂ”e-se a identificar o espaço onde o ator e o manipulador se encontram no cumprimento de suas funçÔes ou contribuem e influenciam o trabalho do outro. Esta pesquisa surgiu do estudo de alguns artistas que atravĂ©s de um olhar sobre a expressividade dos bonecos/objetos no Teatro de Bonecos contribuiriam Ă reflexĂŁo da arte do ator. Portanto, pontuo alguns caminhos onde o ator e o animador agem de maneira prĂłxima, procurando identificar caracterĂsticas comuns que serviriam Ă representação no Teatro
Pufendorf, Samuel
During the last two decades, Samuel von Pufendorfâs (1632â1694) natural law philosophy has become the subject of renewed and growing attentiveness among intellectual historians and philosophers (Seidler 2015). In the late-seventeenth century and early eighteenth century, Pufendorf was the most widely-read moral and political philosopher in Europe, whose reputation is most clearly exemplified in the impressive number of translations and editions of his works. Pufendorfian natural law theory offered a shared vocabulary and conceptual possibilities for the discussion of morality, politics and interstate relations for numerous eighteenth-century thinkers, such as Christian Thomasius, the authors of the Scottish Enlightenment and Jean-Jacques Rousseau. Pufendorf spent large parts of his career in princely courts and portrayed the history of states and their natural law foundations in his widely circulated historical works (Seidler 1997). Moreover, he also wrote on the issues of theology and church-state relations (Döring 1992, Zurbuchen 1998).Peer reviewe
Vortex microavalanches in superconducting Pb thin films
Local magnetization measurements on 100 nm type-II superconducting Pb thin
films show that flux penetration changes qualitatively with temperature. Small
flux jumps at the lowest temperatures gradually increase in size, then
disappear near T = 0.7Tc. Comparison with other experiments suggests that the
avalanches correspond to dendritic flux protrusions. Reproducibility of the
first flux jumps in a decreasing magnetic field indicates a role for defect
structure in determining avalanches. We also find a temperature-independent
final magnetization after flux jumps, analogous to the angle of repose of a
sandpile.Comment: 6 pages, 5 figure
Maximal -regularity for stochastic evolution equations
We prove maximal -regularity for the stochastic evolution equation
\{{aligned} dU(t) + A U(t)\, dt& = F(t,U(t))\,dt + B(t,U(t))\,dW_H(t),
\qquad t\in [0,T],
U(0) & = u_0, {aligned}. under the assumption that is a sectorial
operator with a bounded -calculus of angle less than on
a space . The driving process is a cylindrical
Brownian motion in an abstract Hilbert space . For and
and initial conditions in the real interpolation space
\XAp we prove existence of unique strong solution with trajectories in
L^p(0,T;\Dom(A))\cap C([0,T];\XAp), provided the non-linearities
F:[0,T]\times \Dom(A)\to L^q(\mathcal{O},\mu) and B:[0,T]\times \Dom(A) \to
\g(H,\Dom(A^{\frac12})) are of linear growth and Lipschitz continuous in their
second variables with small enough Lipschitz constants. Extensions to the case
where is an adapted operator-valued process are considered as well.
Various applications to stochastic partial differential equations are worked
out in detail. These include higher-order and time-dependent parabolic
equations and the Navier-Stokes equation on a smooth bounded domain
\OO\subseteq \R^d with . For the latter, the existence of a unique
strong local solution with values in (H^{1,q}(\OO))^d is shown.Comment: Accepted for publication in SIAM Journal on Mathematical Analysi
Greater sexual reproduction contributes to differences in demography of invasive plants and their noninvasive relatives
An understanding of the demographic processes contributing to invasions would improve our mechanistic understanding of the invasion process and improve the efficiency of prevention and control efforts. However, field comparisons of the demography of invasive and noninvasive species have not previously been conducted. We compared the in situ demography of 17 introduced plant species in St. Louis, Missouri, USA, to contrast the demographic patterns of invasive species with their less invasive relatives across a broad sample of angiosperms. Using herbarium records to estimate spread rates, we found higher maximum spread rates in the landscape for species classified a priori as invasive than for noninvasive introduced species, suggesting that expert classifications are an accurate reflection of invasion rate. Across 17 species, projected population growth was not significantly greater in invasive than in noninvasive introduced species. Among five taxonomic pairs of close relatives, however, four of the invasive species had higher projected population growth rates compared with their noninvasive relative. A Life Table Response Experiment suggested that the greater projected population growth rate of some invasive species relative to their noninvasive relatives was primarily a result of sexual reproduction. The greater sexual reproduction of invasive species is consistent with invaders having a life history strategy more reliant on fecundity than survival and is consistent with a large role of propagule pressure in invasion. Sexual reproduction is a key demographic correlate of invasiveness, suggesting that local processes influencing sexual reproduction, such as enemy escape, might be of general importance. However, the weak correlation of projected population growth with spread rates in the landscape suggests that regional processes, such as dispersal, may be equally important in determining invasion rate
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