The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Fangli Ning - One of the best experts on this subject based on the ideXlab platform.
-
3d visualization of Stratum with faults based on vtk
Computational Intelligence, 2009Co-Authors: Fangli NingAbstract:D Stratum can become one useful auxiliary geological tool. Based on this tool, geologist can analyze Stratum more accurately and scientific. VTK is an object-oriented visualization class library. 3D Stratum is interpolated with Kriging method. Faults are common geological phenomenon. In order to visualize Stratum, with Faults, one new interpolation method is proposed. Keywords-Stratum; Fault; Visualization; VTK
Fredi Alexander Diaz-quijano - One of the best experts on this subject based on the ideXlab platform.
-
Sample allocation balancing overall representativeness and Stratum precision.
Annals of epidemiology, 2018Co-Authors: Fredi Alexander Diaz-quijanoAbstract:Abstract Purpose In large-scale surveys, it is often necessary to distribute a preset sample size among a number of strata. Researchers must make a decision between prioritizing overall representativeness or precision of Stratum estimates. Hence, I evaluated different sample allocation strategies based on Stratum size. Methods The strategies evaluated herein included allocation proportional to Stratum population; equal sample for all strata; and proportional to the natural logarithm, cubic root, and square root of the Stratum population. This study considered the fact that, from a preset sample size, the dispersion index of Stratum sampling fractions is correlated with the population estimator error and the dispersion index of Stratum-specific sampling errors would measure the inequality in precision distribution. Identification of a balanced and efficient strategy was based on comparing those both dispersion indices. Results Balance and efficiency of the strategies changed depending on overall sample size. As the sample to be distributed increased, the most efficient allocation strategies were equal sample for each Stratum; proportional to the logarithm, to the cubic root, to square root; and that proportional to the Stratum population, respectively. Conclusions Depending on sample size, each of the strategies evaluated could be considered in optimizing the sample to keep both overall representativeness and Stratum-specific precision.
Zhao Xinquan - One of the best experts on this subject based on the ideXlab platform.
-
Responses of contents of soil nutrient factors and water to stocking rates for yaks in Kobresia parva alpine meadow Iresponses to contents of soil nutrient factors and water to stocking rates in summer pasture
2004Co-Authors: Dong Quan-min, Zhao XinquanAbstract:Effects of stocking rates on contents of soil nutrient and water in summer pasture of alpine meadow had been studied for two years. The result showed that contents of organic matter, organic C, total N and total P decreased in the same Stratum with the increase of stocking rates, and there was a significant linear regression relationship between their contents and stocking rates, the second degree polynomial regression between stocking rates and contents of available N, and then average nutrient contents of every nutrient factors (0~20 cm soil layer) had a similar response with contents of every Stratum. And the contents of 0~5 cm, 5~10 cm, 10~20 cm soil layer for available N reached to the minimum values successively when stocking rates equaled to 1.64, 1.73 and 1.97 heads/hm~2 respectively, and stocking rate was (1.67) heads/hm~2 average contents of available N reaching to the peak value, and then contents of available N began increasing continually. Contents of organic matter, organic C were extremely significant difference in different Stratums under the same stocking rates (P0.01), significant difference for total P(P(0.05)) and no significant difference for total N and available N (P0.05), and the interactions of stocking rates and grazing time had an extremely significant effect on contents of every nutrient factor in different soil Stratum (P0.01). Besides, effect of stocking rates on water contents of every Stratum was significant (P0.05), the yearly change was not significant (P05).
Torbjörn Egelrud - One of the best experts on this subject based on the ideXlab platform.
-
Stratum Corneum Tryptic Enzyme in Normal Epidermis: a Missing Link in the Desquamation Process?
Journal of Investigative Dermatology, 2000Co-Authors: I. Elisabeth Ekholm, Maria Brattsand, Torbjörn EgelrudAbstract:Stratum corneum chymotryptic enzyme may be important in desquamation. It has also been suggested that other proteases, especially Stratum corneum tryptic enzyme, may be involved. Stratum corneum tryptic enzyme has been purified and its cDNA has been cloned. Results from expression analyses indicate that Stratum corneum tryptic enzyme is as skin specific as Stratum corneum chymotryptic enzyme. In this work we have produced and characterized antibodies specific for Stratum corneum tryptic enzyme. We have also by means of biochemical, immunochemical, and immunohistochemical methods performed studies on Stratum corneum tryptic enzyme in normal human epidermis. Antibodies against bacterial recombinant Stratum corneum tryptic enzyme were produced and purified by affinity chromatography. Two types of antibodies were obtained: one reacting only with pro-Stratum corneum tryptic enzyme and one specific for the catalytically active part of Stratum corneum tryptic enzyme. Immunohistochemistry with the antibodies reacting with pro-Stratum corneum tryptic enzyme showed a staining pattern similar to Stratum corneum chymotryptic enzyme-specific antibodies, i.e., the expression was confined to cornifying epithelia with a need of desquamation-like processes. Extracts of tape strips with superficial human Stratum corneum were found to contain precursors as well as active forms of Stratum corneum tryptic enzyme and Stratum corneum chymotryptic enzyme. The enzymes had maximal activity at pH 8, but both had considerable activity also at pH 5.5. The results were compatible for a role of Stratum corneum tryptic enzyme in desquamation. Stratum corneum tryptic enzyme may act in concert with Stratum corneum chymotryptic enzyme and/or function as a Stratum corneum chymotryptic enzyme-activating enzyme. The presence in normal superficial Stratum corneum of precursors as well as of active forms of Stratum corneum chymotryptic enzyme and Stratum corneum tryptic enzyme, and the activity of both enzymes over a broad range of pH-values, suggest some possible ways by which the desquamation may be regulated.
-
Intercellular lamellar lipids in plantar Stratum corneum.
Acta dermato-venereologica, 1991Co-Authors: Torbjörn Egelrud, A LundströmAbstract:Plantar Stratum corneum was examined by means of transmission electron microscopy after conventional osmium fixation and after fixation with ruthenium tetroxide. The latter fixative was used in order to reveal the possible existence of lamelarly ordered lipids in the intercellular space, as has previously been demonstrated for non-palmo-plantar Stratum corneum. A major part of the plantar Stratum corneum intercellular space was occupied by extracellular parts of desmosomes. In specimens fixed with ruthenium tetroxide the intercellular space not occupied by desmosomes was found to contain multiple alternating electron dense and electron lucid bands, suggestive of membraneous structures. This pattern appeared to be similar to that previously described for non-palmo-plantar Stratum corneum. It is suggested that the intercellular lipids of palmo-plantar Stratum corneum may be qualitatively similar to the intercellular lipids of non-palmo-plantar Stratum corneum. The lower lipid content, expressed as weight per unit weight of tissue, in palmo-plantar Stratum corneum as compared to non-palmo-plantar Stratum corneum may be related to the fact that a larger portion of the intercellular space of the former tissue is occupied by desmosomes. The relatively high water permeability of palmo-plantar Stratum corneum implies that desmosomes, i.e. non-lipid regions of the intercellular space, may have a high water permeability and hence could establish a hydrophilic route through the Stratum corneum.
Ruud Van Den Bos - One of the best experts on this subject based on the ideXlab platform.
-
The dorsal striatum and ventral striatum play different roles in the programming of social behaviour: a tribute to Lex Cools.
Behavioural pharmacology, 2015Co-Authors: Ruud Van Den BosAbstract:Early work by Lex Cools suggested that the caudate nucleus (dorsal striatum) plays a role in programming social behaviour: enhanced activity in the caudate nucleus increased the extent to which ongoing behaviour is controlled by the individual's own behaviour (internal control) rather than by that of its partners (external control). Interestingly, later studies by others have indicated that the ventral striatum plays a role in external rather than internal control. Here, I discuss the role of these different striatal areas - and the emotional (ventral striatum) and cognitive control (dorsal striatum) system in which they are embedded - in the organization of social behaviour in the context of locus of control. Following on from this discussion, I will pay particular attention to individual differences in social behaviour (individuals with more internal or external control), focusing on the role of dopamine, serotonin and the effects of stress-related challenges in relation to their different position in a dominance hierarchy. I will subsequently allude to potential psychological and behavioural problems in the social domain following on from these differences in locus of control ['social obliviousness' (dorsal Stratum) and 'social impulsivity' (ventral striatum)]. In doing so, I provide as a tribute a historical account of the early research by Lex Cools.
