A practical method of designing active filters in which the transfer function is independent of both firstand second-order operational amplifier time constant effects is presented. Neither matched operational amplifiers nor a tuning procedure dependent on an active parameter is required. The active portion of these filters is universal and readily integrable since it is comprised of conventiona...

Fast protein liquid chromatography on Superose 6 o f crude extracts from the chlorophyllfree mutant no. 20 o f the unicellular green alga Chlorella kessleri reveals two possibly o ligo­ meric forms o f pyruvate kinase (2.7.1.40). Their occurrence is markedly altered in the course o f heterotrophic growth with changing levels o f exogenous glucose as carbon source with only one enzyme species wi...

The association o f the lipophilic tertiary amine and local anesthetic dibucaine with osmotically shocked chloroplasts o f Spinacia oleracea L. cv. Monatol was investigated. Dibucaine, known as an effective inhibitor o f thylakoid membrane energization and ATP synthesis, ex­ hibited three distinct binding classes with chloroplasts: partitioning in the lipid phase o f the membranes, electrostati...

o o o oo o o oo o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o Millimeter and submillimeter bservati ns pr vide a valuable t l f r pr bing the c l, dusty material in the disks ar und y ung stars. With ng ing instrumental upgrades, the technique f interfer metry n w btains subarcsec nd res luti n a...

o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o We review the recent c ntributi n f high-res luti n spectr sc py t advances in ur understanding f the regi n within a few AU f y ung l w-mass stars. In particular, we describe the r le played by str ng stellar magnetic fields in the res luti n f the angular m mentum pr blem f r star f rmati n, and ur ability t pr be the pr perties ...

The basic idea o f our anticipatory approach t o perception is t o avoid the common separation o f perception and generation o f behavior and t o fuse both aspects in to a consistent neural process. Our approach is based on the prediction o f the consequences o f hypothetically executed actions. In this sense, perception o f space and shape is assumed t o be a generative process o f anticipatin...

Illumination o f thylakoid membranes in the presence o f 3-(3',4'-dichlorophenyl)-1,1-dimethyl urea (D C M U ) causes the reduction o f the primary quinone acceptor QA o f photosys­ tem II (PS II) and the storage o f a positive charge on the donor side o f the photochemical reac­ tion center. These oxidation-reduction reactions are accompanied by characteristic changes o f absorbance in the ult...

DEAE-Dextran, Dunaliella, Membrane Permeability, Photosynthesis, Polycations As a prerequisite for studies o f the intracellular distribution o f enzymes o f the glycerol cycle in Dunaliella parva, the effect o f the polycation DEAE-dextran on the permeability o f membranes for various endogenous compounds and on photosynthesis was investigated. DEAE-dextran induces an increase o f the permeabi...