S permatogenesis is a tightly regulated process of development for the generation of mature spermatozoa. Mammalian spermatogenesis occurs in the convoluted seminiferous tubules of the testes, where spermatogenic stem cells (SSCs) reside on sustentacular Sertoli cells of somatic origin, forming a germinal epithelial structure. Spermato genesis is accomplished in a complicated, timely controlled ...

New algorithms for parallel one-dimensional globally adaptive quadrature are developed. The algorithms are implemented on a Kendall Square Research KSR-1 parallel computer and numerical results are presented. The most successful algorithm gives signiicant speedups on a range of hard problems, including ones with singular integrands.

During embryonic organogenesis, the odontogenic potential resides in dental mesenchyme from the bud stage until birth. Mouse dental mesenchymal cells (mDMCs) isolated from the inductive dental mesenchyme of developing molars are frequently used in the context of tooth development and regeneration. We wondered if and how the odontogenic potential could be retained when mDMCs were cultured in vit...

This report compares the performance of di erent computer systems for basic message passing. Latency and bandwidth are measured on Convex, Cray, Fujitsu, IBM, Intel, KSR, Meiko, nCUBE, NEC, SGI, and TMC multiprocessors. Communication performance is contrasted with the computational power of each system. The comparison includes both shared and distributed memory computers as well as networked wo...

Ras interacts with numerous downstream effectors to transmit a diverse array of cellular signals. A new study shows that a protein known as Impedes Mitogenic signal Propagation, IMP, is an E3 ubiquitin ligase that binds Ras and modulates MAP kinase signaling by regulating the scaffolding activity of KSR.