The discussion in Janet, LeCons sur les Systames d 'Aquations aux Dirivkes Partielles, Paris 1929, pp. 74-75, is particularly relevant. The other references are: C. Riquier, Les Systames d'Aquations aux Derivees Partielles, Paris, 1910, and J. M. Thomas, Differential Systems, New York, 1937. 8 See the author's paper "The General Geometry of Paths," Ann. Math., 29, 143-168 (1928). 9 For the defi...

OBJECTIVES Families differ widely in the support they provide to adult offspring, both with regard to the overall level as well as the extent to which support is evenly distributed across offspring. This study addressed these dynamics by creating family profiles based on the average level and differentiation of support among children. We also examined demographic and psychological factors that ...

In conclusion, the information available indicates that the interactions between different cell types in the testis play an important role in the control and maintenance of testicular functions. Further characterization of these interactions will clearly provide insight into the cell biology of the testis and into the regulation of cellular differentiation, function, and growth. It is apparent ...

Regulatory T cells are important for ensuring that the immune system does not attack self and does not overreact to external antigens. Understanding how these cells develop and maintain stable function provides general insights into cellular differentiation in general, as well as new opportunities for therapeutic manipulation.

We propose and demonstrate a reconfigurable photonic temporal differentiator based on a dual drive Mach-Zehnder modulator (DDMZM). The differentiator can be reconfigured to different differentiation types by simply adjusting the bias voltage of DDMZM. Both simulations and experiments are carried out to verify the proposed scheme. In the experiment, a pair of polarity-reversed field differentiat...

Despite intense recent interest, the suppressive mechanisms of regulatory CD25+CD4 T cells remain poorly understood. One deficiency in the field is the lack of in vivo models where the effects of regulatory CD25+CD4 T cells on antigen-specific responder T cells can be measured quantitatively. We describe one such model here. We compared responses of adoptively transferred naive wild-type antige...

Gestalt psychologists identified several stimulus properties thought to underlie visual grouping and figure/ground segmentation, and among those properties was common fate: the tendency to group together individual objects that move together in the same direction at the same speed. Recent years have witnessed an upsurge of interest in visual grouping based on other time-dependent sources of vis...

A case of a symptomatic Rathke's cleft cyst in a 10-year-old boy is described. The importance of the intraoperative differentiation between this rare tumor and a craniopharyngioma is discussed.

In this paper, we establish that the Lagrangian-type material differentiation formulas, that allow to express the first-order derivative of a (regular) surface integral with respect to a geometrical domain perturbation, still hold true for the strongly singular and hypersingular syrface integrals usually encountered in boundary integral formulations. As a consequence, this work supports previou...