Single-order-parameter description of glass-forming liquids:A one-frequency test

Thermo-viscoelastic linear-response functions are calculated from the master equation describing viscous liquid inherent dynamics. From the imaginary parts of the frequency-dependent isobaric specific heat, isothermal compressibility, and isobaric thermal expansion coefficient, we define a "linear dynamic Prigogine-Defay ratio" with the property that if this quantity is unity atone frequency, then it is unity at all frequencies. This happens if and only if there is a single-order-parameter description of the thermo-viscoelastic linear responses via an order parameter (which may be non-exponential in time). Generalizations to other cases of thermodynamic control parameters than temperature and pressure are treated in an Appendix.Comment: Replaces arXiv:cond-mat/040570

Fluids and barriers of the CNS: a historical viewpoint

Tracing the exact origins of modern science can be a difficult but rewarding pursuit. It is possible for the astute reader to follow the background of any subject through the many important surviving texts from the classical and ancient world. While empirical investigations have been described by many since the time of Aristotle and scientific methods have been employed since the Middle Ages, the beginnings of modern science are generally accepted to have originated during the 'scientific revolution' of the 16th and 17th centuries in Europe. The scientific method is so fundamental to modern science that some philosophers consider earlier investigations as 'pre-science'. Notwithstanding this, the insight that can be gained from the study of the beginnings of a subject can prove important in the understanding of work more recently completed. As this journal undergoes an expansion in focus and nomenclature from cerebrospinal fluid (CSF) into all barriers of the central nervous system (CNS), this review traces the history of both the blood-CSF and blood-brain barriers from as early as it was possible to find references, to the time when modern concepts were established at the beginning of the 20th century

A NEW PRINCIPLE OF REGULATION OF ENZYMIC ACTIVITY - ACTIVATION AND REGULATION OF HUMAN POLYMORPHONUCLEAR LEUKOCYTE COLLAGENASE VIA DISULFIDE-THIOL EXCHANGE AS CATALYZED BY THE GLUTATHIONE CYCLE IN A PEROXIDASE-COUPLED REACTION TO GLUCOSE-METABOLISM

Tschesche H, MACARTNEY HW. A NEW PRINCIPLE OF REGULATION OF ENZYMIC ACTIVITY - ACTIVATION AND REGULATION OF HUMAN POLYMORPHONUCLEAR LEUKOCYTE COLLAGENASE VIA DISULFIDE-THIOL EXCHANGE AS CATALYZED BY THE GLUTATHIONE CYCLE IN A PEROXIDASE-COUPLED REACTION TO GLUCOSE-METABOLISM. EUROPEAN JOURNAL OF BIOCHEMISTRY. 1981;120(1):183-190