receives negative feedback or is otherwise threatened and may be especially adaptive under these circumstances. Decades of psychological wisdom have established contact with reality as a hallmark of mental health. In this view, the well-adjusted person is thought to engage in accurate reality testing

Mitogen stimulation favours replication of equine herpesvirus-1 in equine blood mononuclear cells by inducing cell proliferation and formation of close intercellular contacts

closed form function of time. The collision detection system is general and can be easily in-terfaced with a variety of applications. The algorithm uses a two-level approach based on pruning multiple-object pairs using bounding boxes and performing exact collision detection between selected pairs

JSTOR, please contact support@jstor.org. economic history. The form of this generalization is a set of stages of growth, which can be designated as follows: the traditional society; the preconditions for take-off; the take-off; the drive to maturity; the age of high mass consumption. Beyond the age

We establish a parametric extension h-principle for overtwisted contact structures on ma-nifolds of all dimensions, which is the direct generalization of the 3-dimensional result from [7]. It implies, in particular, that any closed manifold admits a contact structure in any given homotopy class

Abstract. Given a contact structure on a closed, oriented three-manifold Y, we describe an invariant which takes values in the three-manifold’s Floer homology ̂ HF (in the sense of [10]). This invariant vanishes for overtwisted contact structures and is non-zero for Stein fillable ones

Abstract. In their progression from the basal to upper differentiated layers of the epidermis, keratinocytes undergo significant structural changes, including establishment of close intercellular contacts. An important but so far unexplored question is how these early structural events are related

Abstract. The LIM 1863 colon carcinoma cell line grows as structural organoids of goblet and columnar cells around a central lumen and provides a model for the development of stem cells in the normal colon. The organoid structure can be disrupted by removal of calcium from the medium, resulting in a suspension of single cells. Upon re, addition of calcium, the cells reform the organoid structure over a period of 24 h, and ultrastructural examination of the reforming cells reveals that this involves a complex process that we have termed clutching. To determine the adhesion molecules involved in organoid formation we attempted to block this process by single cell suspensions of LIM 1863 reseeded in the presence of monoclonal antibodies. An anti-integrin antibody directed against a conforma-

, we contacted the Quebec Ministry of Education to establish a list of students who did not re-enroll in any high school in the Province of Quebec. Once we had this initial list, we contacted the seven schools individually to determine which of the students were true dropouts, that is, those who had

(i) Four-manifolds with contact boundary The monopole invariants, or Seiberg-Witten invariants, introduced by Witten [27] are invariants of a smooth, closed, oriented 4-manifold X. When bC(X) is greater than 1, they can be regarded as defining a map