Electronic spectral properties o f polyphenyls, in particular terphenyls, have been a subject o f numerous studies [1 -5 ] . In 1985 a new and efficient method o f the synthesis o f 3,5-diarylaminobenzenes and their derivatives was developed by Sepioi and Milart [6], Some fluorescent compounds belonging to this group, presented in Fig. 1, were chosen as a model set for the investigation o f sev...

Photosynthetic activity and molecular composition o f thylakoid membranes o f sensitive and atrazine/paraquat coresistant biotypes o f Conyza canadensis (L.) Cronq was compared before and after 5 x 10~4 molar paraquat spraying. In contrast to the irreversibly damaged sensitive plants the Rfd values (vitality indices) calculated from parameters o f fluorescence induction curves, and the in vivo ...

The heats o f transport o f several substitutional impurities (such as Sb, Sn, In, Ag, N i and Co) in copper and silver are discussed in terms o f atom ic quantities. They are considered as consisting of essentially two parts. The first one, the so-called intrinsic heat o f transport, can be derived from the electrostatic potential generated by the im purity at the site o f a normal lattice ato...

When a meniscus i s f o m e d a t the free end o f a c a p i l l a r y tube and i s subjec ted t o the e f f e c t o f a s u f f i c i e n t l y in tense e l e c t r i c f i e l d , the meniscus may d i s p l a y the shape o f a cone. Depending upon the experiment condi t ions, a f i e l d e f f e c t charge emission, the product ion o f d rop le ts o r corona discharge may be observed a t the ...

In this experiment, the effect o f betamethasone administered in the early postacute infection o f mice by Trypanosoma cruzi was studied. This drug was administered during 30 days after the 42nd day o f infection in a dose o f 0.15 mg/day. The betame­ thasone treatment did not cause fresh outbreaks o f parasitemia and the histopathological findings in the chronic phase were not different from t...

Protoporphyrinogen oxidase, the last enzyme o f the com m on tetrapyrrole biosynthetic pathway, is inhibited by several peroxidizing com pounds resulting in accum ulation o f pho to ­ dynamic tetrapyrroles, mainly protoporphyrin IX. The inhibition characteristics o f two chemi­ cally unrelated com pounds were studied using m em brane bound pro toporphyrinogen oxidase from corn etioplasts. As sh...

The reversible binding kinetics o f atrazine, diuron and ioxynil were measured via their bind­ ing and release parameters during steady state inhibition o f electron transport. The parameters were determined in isolated chloroplasts o f peas and o f triazine-resistant and -susceptible bio­ types o f Chenopodium album using a kinetic model. This model is based on the flash-induced oxygen evoluti...

P i l o t p lan t t e s t s have been conducted t o evaluate the e f f e c t s o f magnesium and c h l o r i d e ions on system performance o f 1 imestone-regenerated dual a1 ka l i processes under closed-loop operat ing cond i t i ons . It was found t h a t l imestone r e a c t i v i t y and s o l i d s dewatering p roper t i es a r e ve ry s e n s i t i v e t o magnesium i o n concentrat ions...

A radiological study o f the small intestine o f 17 untreated patients in the acute phase ofschistosomiasis was performed. Twelve patients (70% o f total) had alterations: nine had clear-cut thickening o f the duodenal and jejunal folds, one flocculation, one fragmentation and one thickening o f mucosae, flocculation and fragmentation o f the barium column. There was no correlation o f the gast...

Herbicides, Photosynthesis, Highand Low-Affinity Binding, Thylakoids, Algae Highand low-affinity binding o f photosystem II herbicides to isolated thylakoids of Spinacia oleracea and to intact cells o f the unicellular green alga Ankistrodesmus braunii were investigated. Complete mutual displacement o f bound diuron-type herbicides (e.g. diuron, atrazine, terbutryn) by either diuronor phenol-ty...