4,270 research outputs found
Resilience: Accounting for the Noncomputable
Plans to solve complex environmental problems should always consider the role of surprise. Nevertheless, there is a tendency to emphasize known computable aspects of a problem while neglecting aspects that are unknown and failing to ask questions about them. The tendency to ignore the noncomputable can be countered by considering a wide range of perspectives, encouraging transparency with regard to conflicting viewpoints, stimulating a diversity of models, and managing for the emergence of new syntheses that reorganize fragmentary knowledg
A Bioassay To Investigate Movement of Wood Preservatives From Poles Into Soil A Research Note
A promising method was found for investigating migration of preservative from preservative-treated poles into surrounding soil. The presence and relative amounts of preservative are indicated by suppression of decay (weight loss) in birch coffee-stirring sticks buried at various distances from the pole
P02.181. Heart rate variability and peripheral temperature during whole body immersion at different water temperatures
CaracterĂsticas fenotĂpicas de 44 progĂȘnies de Maytenus ilicifolia Mart. ex Reiss. cultivadas no municĂpio de Ponta Grossa, PR.
Resumo
P04.22. Comparison of patient-centeredness and patient-reported health outcomes in integrative medicine hospitals with conventional hospitals in Germany
Independent analysis of the orbits of Pioneer 10 and 11
Independently developed orbit determination software is used to analyze the
orbits of Pioneer 10 and 11 using Doppler data. The analysis takes into account
the gravitational fields of the Sun and planets using the latest JPL
ephemerides, accurate station locations, signal propagation delays (e.g., the
Shapiro delay, atmospheric effects), the spacecrafts' spin, and maneuvers. New
to this analysis is the ability to utilize telemetry data for spin, maneuvers,
and other on-board systematic effects. Using data that was analyzed in prior
JPL studies, the anomalous acceleration of the two spacecraft is confirmed. We
are also able to put limits on any secondary acceleration (i.e., jerk) terms.
The tools that were developed will be used in the upcoming analysis of recently
recovered Pioneer 10 and 11 Doppler data files.Comment: 22 pages, 5 figures; accepted for publication in IJMP
Serum Differentially Modulates the Clonal Growth and Differentiation of Cultured Limbal and Corneal Epithelium
Purpose. The stem cell-containing limbal epithelium is in proximity with highly vascularized tissue, as opposed to the transient amplifying cell-containing corneal basal epithelium, which resides on top of avascular corneal stroma. We therefore speculate that limbal stem cells are preferentially under the modulation of serum-derived factors. Methods. Using a previously reported serum-free, chemically defined culture system for ocular surface epithelium, a culture condition primarily supporting transient amplifying cells of both corneal and limbal epithelia, we compared the clonal growth measured by colony-forming efficiency (CFE), colony size, and BrdU labeling, as well as colony differentiation measured by colony morphology and immunofluorescence staining, with the monoclonal antibody AE-5 against keratin K3 when fetal bovine serum (FBS) was added at different concentrations. Results. The addition of 1% FBS decreased CFE and colony size in peripheral corneal cultures but had no effect in limbal cultures. Both cultures showed no obvious difference in colony morphology or BrdU labeling and AE-5 staining. In contrast, at 10% or 20% FBS, CFE and colony size increased in limbal cultures, but dose dependently decreased in peripheral corneal cultures. The presence of a unique subpopulation of progenitor cells in limbal cultures different from transient amplifying cells in corneal cultures was further supported by the emergence of a higher proportion of a unique type (B) colonies in limbal cultures that had high BrdU labeling and heterogeneous or negative AE-5 staining, indicative of their being in a proliferating, undifferentiated state. These colonies showed continuous growth in late cultures and could be passaged into serum-free medium. Conclusio
Intention of preserving forest remnants among landowners in the Atlantic Forest: The role of the ecological context via ecosystem services
Unravelling the psychological processes determining landowners' support towards forest conservation is crucial, particularly in rural areas of the tropics, where most forest remnants are within private lands. As humanânature connections are known to shape proâenvironmental behaviours, the intention of preserving forest remnants should ultimately be determined by the ecological context people live in. Here, we investigate the pathways through which the ecological context (forest cover), via direct contact with forests and ecosystem services and disservices, influence the psychological antecedents of conservation behaviour (beliefs, attitude and intention of preserving forest remnants). We conceptualized a model based on the Reasoned Action Approach, using the ecological context and these three forest experiences as background factors, and tested the model using Piecewise Structural Equation Modelling. Data were collected through an interviewâbased protocol applied to 106 landowners across 13 landscapes varying in forest cover in a consolidated rural region in the Brazilian Atlantic Forest. Our results indicate that: (a) ecosystem services are more important than disservices for shaping intention of preserving forests, particularly nonâprovisioning services; (b) contact with forest has an indirect effect on intention, by positively influencing the frequency of receiving ecosystem services; (c) people living in more forested ecological contexts have more contact with forests, receive ecosystem services more frequently and, ultimately, have stronger intention of preserving forests. Hence, our study suggests a dangerous positive feedback loop between deforestation, the extinction of forest experiences and impairment of humanânature connections. Local demands across the full range of ecosystem services, the balance between services and disservices and the ecological context people live in should be considered when developing conservation initiatives in tropical rural areas
Singular and regular solutions of a non-linear parabolic system
We study a dissipative nonlinear equation modelling certain features of the
Navier-Stokes equations. We prove that the evolution of radially symmetric
compactly supported initial data does not lead to singularities in dimensions
. For dimensions we present strong numerical evidence supporting
existence of blow-up solutions. Moreover, using the same techniques we
numerically confirm a conjecture of Lepin regarding existence of self-similar
singular solutions to a semi-linear heat equation.Comment: 16 page
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