We describe an approach to measuring cerebral blood flow (CBF) based on independent measurements of cerebral blood volume (CBV) and mean transit time (MTT) with calculation of CBF by using the central volume theorem: CBF = CBV / MTT. This permits optimization of the individual acquisitions and analyses. In particular, measurement of CBV during contrast infusion, rather than simultaneously with ...

coimplantation with a MtT or by daily administration of the tranquilizing drug, perphenazine (4-[3-(2-chborophenothiazin 10-yI)propyl]-1 -piperazineethanol) (6). MTW9-MtT is grown by coimplantation of MTW9 with MtTW10, a MtT which secretes prolactin, growth hormone, and probably ACTH (5). MTW9-MtT stops growing after ovaniec tomy but does not regress; regression occurs after surgical removal of...

coimplantation with a MtT or by daily administration of the tranquilizing drug, perphenazine (4-[3-(2-chborophenothiazin 10-yI)propyl]-1 -piperazineethanol) (6). MTW9-MtT is grown by coimplantation of MTW9 with MtTW10, a MtT which secretes prolactin, growth hormone, and probably ACTH (5). MTW9-MtT stops growing after ovaniec tomy but does not regress; regression occurs after surgical removal of...

BACKGROUND Over the past, the severe thoracic trauma has had decisive influence on the outcome of multiple injured patients. Today, new therapies (e.g. extracorporeal membrane oxygenation (ECMO), protective ventilation methods and new forms of patient positioning) are available and applied regularly. What impact on the patient's outcome does the thoracic trauma have today? METHODS Prospective...

The ability of sperm cells to develop colored formazan by reduction of MTT was used earlier to develop a spectrophotometric assay to determine the viability of sperm cells for several mammalian species. It was the objective of the present study to visualize microscopically the location of the formazan in boar sperm cells. The MTT staining process of boar sperm cells can be divided into a series...

A new, integrated approach to microwave design is presented involving concepts such as optimal design centering, optimal design tolerancing, optimal design tuning, parasitic effects, uncertainties in models and reference planes, and mismatched terminations. The approach is of the worst case type, and previously published design schemes fall out as particular cases of the ideas presented. The ma...

The MTT reduction assay depends on the ability of metabolically active cells to reduce the tetrazolium salt (3[4,5-dimethylthiazol-2-y1]-2,5-diphenyltetrazolium bromide) to formazan. This study was conducted to examine and validate a simple and less costly MTT test to determine bovine sperm viability and compare the efficiency of this test with a flow cytometer. Fresh ejaculates from eight bull...

This paper raises and discusses three questions about the structure of Meaning-Text Theory, based on consideration of the role that paradigmatic Lexical Functions play in its model of the lexicon: Is the paradigmatic-syntagmatic distinction meaningful? Do paradigmatic LFs represent redundant semantic information (and if so, is the redundancy justified)? And finally, might definitions of lexemes...