A toy model is proposed which incorporates the reversible mode coupling mechanism responsible for ergodic-nonergodic transition with trivial Hamiltonian in the mode coupling theory (MCT) of structural glass transition. The model can be analyzed without relying on uncontrolled approximations inevitable in the current MCT. The strength of hopping processes can be easily tuned and the Leutheusser-...

A novel cover slip-transfer culture system was designed to study the functional roles of stromal cells in hemopoiesis, particularly erythropoiesis. Human bone marrow stromal cell colonies were allowed to develop on small glass cover slips in liquid medium. The cover slips, along with the stromal cell colonies and progenitors attached to them were then transferred to a new tissue culture dish an...

A new method is proposed to measure bacterial cells under growth conditions. Bacterial cells, suspended in their growth medium, were attached to a cover slip with poly-L-lysine. The cover slip was inverted and placed on a glass microscope slide. To prevent dehydration of the medium, the edges of the cover slip were sealed to the microscope slide with clear fingernail polish. The bacteria on the...

We introduce the successive Hitting Set model, where the set system is not given in advance but a set generator produces the sets that contain a specific element from the universe on demand. Despite incomplete knowledge about the set system, we show that several approximation algorithms for the conventional Hitting Set problem can be adopted to perform well in this model. We describe, and exper...

We study a geometric hitting set problem involving unirectional rays and curves in the plane. We show that this problem is hard to approximate within a logarithmic factor even when the curves are convex polygonal x-monotone chains. Additionally, it is hard to approximate within a factor of 76 even when the curves are line segments with bounded slopes. Lastly, we demonstrate that the problem is ...

Inside Cover: In article number 2100408 by C. Remzi Becer and co-workers, N-substituted polyamides with high biomass content tunable physical properties, such as glass transition temperature hydrophobicity, are prepared via an efficient catalyst-free Ugi 4-component reaction polymerization in optimized solvent system. The obtained polyamides, which show excellent thermal stability near-room tra...

Changes in habitat-forming organisms can have complex consequences for associated species. Sessile epibenthic glass "plate" sponges (Porifera: Hexactinellida) are conspicuous inhabitants of soft-sediment abyssal areas and their siliceous spicules create persistent spicule patches on the seafloor. Sponge spicule patch density, spatial dispersion, and percent cover were examined over a seven-year...

Compound is a program that accepts a noun compound of arbitrary length and attempts to construct a meaning for it. A noun compound is a sequence of two or more nouns used to describe a single referent. Compound was designed to function as a part of a natural language understanding system. Some of the knowledge (e.g.. context) necessary to understand some compounds must come from sources that a ...

Glass provides mechanical, chemical, and UV protection to solar panels, enabling these devices withstand weathering for several decades. The increasing demand electricity the need reduce anthropogenic carbon emissions require researchers develop new materials processes make even more sustainable. Here, we review current research create environmentally friendly glasses add features cover glass u...