Punctuated equilibrium in an evolving bacterial population

Recently, Lenski et al have carried out an experiment on bacterial evolution. Their findings support the theory of punctuated equilibrium in biological evolution. We show that the M=2 Bak-Sneppen model can explain some of the experimental results in a qualitative manner.Comment: LaTeX, Five PS figures, Accepted for publication in Physica A, 1st August, 199

Neu- und Wiederfunde von Gefäßpflanzen in der Grafschaft Bentheim

Bei der Kartierung der Gefäßpflanzen im Landkreis Grafschaft Bentheim in den Jahren 1990-1996 wurden eine Reihevon Sippen neu entdeckt und einige verschollene wiedergefunden; davon werden 36 Sippen mit Fundortangaben vorgestellt.Whilst investigating phanerogam plants in the district of the "Grafschaft Bentheim", Lower Saxony, Northwest Germany between 1990 and 1996, a number of new taxa were discovered and some absent taxa were found again, 36 of which will be dealt with in further detail

Advanced Rotorcraft Transmission (ART) program-Boeing helicopters status report

The Advanced Rotorcraft Transmission (ART) program is structured to incorporate key emerging material and component technologies into an advanced rotorcraft transmission with the intention of making significant improvements in the state of the art (SOA). Specific objectives of ART are: (1) Reduce transmission weight by 25 pct.; (2) Reduce transmission noise by 10 dB; and (3) Improve transmission life and reliability, while extending Mean Time Between Removal to 5000 hr. Boeing selected a transmission sized for the Tactical Tilt Rotor (TTR) aircraft which meets the Future Air Attack Vehicle (FAVV) requirements. Component development testing will be conducted to evaluate the high risk concepts prior to finalizing the advanced transmission configuration. The results of tradeoff studies and development test which were completed are summarized

Ecological-Evolutionary Theory and Societal Transformation in Post-Communist Europe

Ecological-evolutionary theory offers a distinctive perspective on societal change, ie, it draws attention to the enormous & revolutionary power of technological innovations as a source of change. In this light, some implications for European postcommunist societies in the context of transformation are considered. Ecological-evolutionary theory also offers a distinctive perspective on human nature; implications of this are discussed