Janice M. Pfeffer, PhD

Pfeffer Cell Apparatus

The Pfeffer Zelle (Pfeffer Cell Apparatus), invented by Wilhelm Pfeffer [6] in 1877, measured the minimum pressure needed to prevent a pure solvent from passing into a solution across a semi-permeable membrane, called osmotic pressure. The apparatus provided Pfeffer with a way to quantitatively measure osmotic pressure. Pfeffer devised the apparatus in the 1870s at the University of Basel [7] i...

Suzanne Pfeffer: Sorting through membrane trafficking

S uzanne Pfeffer always wanted to know what makes the human body tick. In many respects, we're still working on deciphering the fi rst page of the body's operating manual—which Pfeffer says is fi ne, since it means there's plenty of room for new discoveries. Pfeffer had her fi rst publication as an undergraduate at UC Berkeley (1), which got her hooked on the spirit of scientifi c inquiry. Foll...

Janice MacKinnon MEDICARE ’ S MID - LIFE CRISIS

On the Semisimplicity of Integral Representation Rings by Janice Zemanek

The integral representation algebra A(RG) is C ®z a(RG). When does a(RG) contain nontrivial nilpotent elements? Let | G\ = pn, where p\n, p prime. Denote by Zp the £-adic valuation ring in Q, and by Zp* its completion. Reiner has shown (i) If a = l , then A(ZPG) and A(Z*G) have no nonzero nilpotent elements (see [ l ] ) . (ii) If ce^2, and G has an element of order p, then both A(ZPG) and A{Z*G...

Osmotic Investigations: Studies on Cell Mechanics (1877), by Wilhelm Pfeffer

Wilhelm Pfeffer [3] published his book Osmotische Untersuchungen: Studien Zur Zellmechanik (Osmotic Investigations: Studies on Cell Mechanics) in 1877 during his time as a professor of botany at the University of Basel [4] in Basel, Switzerland. Gordon R. Kepner and Eduard J. Stadelmann translated the book into English in 1985. Verlag von Wilhelm Engelmann in Leipzig [5], Germany, published the...