A Steiner quadruple system (X, B) is said to be (1, 2)-resolvable if its blocks can be partitioned into r parts such that each point of X occurs in exactly two blocks in each part. The necessary condition for the existence of (1, 2)-resolvable Steiner quadruple systems RSQS(1, 2, v)s is v ≡ 2 or 10 (mod 12). Hartman and Phelps in [A. Hartman, K.T. Phelps, Steiner quadruple systems, in: J.H. Din...

1 Mones JM, Saldana MJ, Oldham SA. Diagnosis of Pnewnocysti.s carinii pneumonia. Roentgenographic-pathologic correlates based on fiberoptic bronchoscopy specimens for patients with the acquired immunodeficiency syndrome. Chest 1986; 89:522-26 2 Hartman B, Koss M, Hui A, Baumann W, Athos L, Boylen T Pneumocystis carinii pneumonia in the acquired immunodeficiency syndrome (AIDS). Diagnosis with b...

Thoracophelia (Annelida, Opheliidae) are burrowing deposit feeders generally found in the mid- to upper intertidal areas of sandy beaches. Thoracophelia mucronata (Treadwell, 1914) is found along the west coast of North America, including at Dillon Beach, CA. Two additional species, Thoracophelia dillonensis (Hartman, 1938) and T. williamsi (Hartman, 1938) were also described from this beach. T...

Discretizations and Grobman-Hartman Lemma, discretizations and the hierarchy of invariant manifolds about equilibria are considered. For one-step methods, it is proved that the linearizing conjugacy for ordinary differential equations in Grobman-Hartman Lemma is, with decreasing stepsize, the limit of the linearizing conjugacies of the discrete systems obtained via time-discretizations. Similar...

s and proceedings from the American Council of Academic Plastic Surgeons Winter Retreat that was held on February 6–7, 2016, in Chicago, Ill. Presented at the American Council of Academic Plastic Surgeons Winter Retreat, February 6 and 7, 2016, Chicago, Ill. 2016 ACAPS Winter Retreat Meeting AbstrActs

Organisms are made up of thousands of different cell types that must migrate, proliferate, and interact with each other to yield functional organ systems and ultimately a viable organism. A characteristic that distinguishes one cell type from another is the set of genes that it expresses. An article by Hartman et al. in the April 2015 issue of GENETICS identified methods to uniquely identify di...