This paper studies socioeconomic networks where agents make both decisions regarding network links and decisions regarding individual actions. In particular, I propose a behavioral model of network formation, where the network configuration arises as the cumulative outcome of agents’ optimal decisions over time rather than as the instantaneous outcome of a one-shot game with many players. Alter...

The density-distribution patterns of various enzymes and of labeled materials have been determined by isopycnic centrifugation in a sucrose-0.2 M KC1 gradient on homogenates of lymphoid tissues from rats injected with Triton WR-1339, 14C-labeled dextran, 51Cr-labeled erythrocytes, and cortisol. The results confirm and extend the conclusion, derived from previous investigations on normal animals...

BACKGROUND It was believed earlier that spermatozoa have no traces of RNA because of loss of most of the cytoplasm. Recent studies have revealed the presence of about 3000 different kinds of mRNAs in ejaculated spermatozoa. However, the correlation of transcriptome profile with infertility remains obscure. METHODS Total RNA from sperm (after exclusion of somatic cells) of 60 men consisting of...

In probability and statistics, Simpson’s paradox is an apparent paradox in which a trend is present in different groups, but is reversed when the groups are combined. Joel Cohen (1986) has shown that continuously distributed lifetimes can never have a Simpson’s paradox. We investigate the same question for discrete random variables to see if a Simpson’s paradox is possible. With discrete random...

This note is a short conceptual elaboration of the conjecture of Saniga et al. [J. Opt. B: Quantum Semiclass 6 (2004) L19–L20] by regarding a set of mutually unbiased bases (MUBs) in a d-dimensional Hilbert space as an analogue of an arc in a (finite) projective plane of order d. Complete sets of MUBs thus correspond to (d + 1)-arcs, i.e., ovals. In the Desarguesian case, the existence of two p...

The most favored model to produce the radiation of GRBs calls for internal shocks within a relativistic outflow of plasma, produced by accretion onto newly born few solar masses black hole. This would produce a neutron rich fireball (Beloborodov 2003, astro-ph/0210522). We investigate the possibility that neutrons, decaying sizably before and during the GRBs phase, heat the protons to relativis...

Recently, structural analysis of the human transferrin and growth hormone (GH) amino acid sequences has unravelled that they harbor a motif identical to a pattern found in viral oncoproteins known to bind the primarily nuclear tumor suppressor retinoblastoma protein (RB). Since related signatures had previously been identified also in insulin and the two insulin-like growth factors (IGFs), the ...

Electron microscopic observations of flagella and cilia have indicated a constancy in the number of peripheral and axial fibrils seen in cross-sections (1-3) and a variability in the structure and form of the basal bodies and accessory structures in different organisms (4-8, 17). During recent electron microscope studies of plastids in colorless flagellates (9), observations were made of an add...