Comparative assessment of morphological, cytological, and photosynthetic characteristics of the induced octoploid and its tetraploid counterpart of Celosia argentea L.

Background: Celosia argentea is a widely recognized plant for its ornamental qualities and therapeutic uses in traditional medicine. As demand for such multipurpose plants grows, enhancing its phenotypic and physiological traits could further expand its commercial potential. Polyploidization, particularly through chemical treatments like oryzalin, offers a method to induce genetic variation and potentially improve desirable traits in plants.

Micropropagation as a Tool for the Conservation of Autochthonous Species of Czechia.

Members of the genus are the only endemic tree species that occur in Czechia. They are important components of endangered plant communities. Their natural regeneration is usually problematic because of their mode of reproduction and because they can survive in rare populations with small numbers of individuals.

First Detection of Phytoplasmas in Rhododendron in the Czech Republic.

A 10-year-old plant of rhododendron ('Cunningham's White' PS986) with leaf malformation and variegation was observed in Prague in 1997. This plant was micropropagated, and regenerants with severe, mild and no symptoms were obtained. Phytoplasma infection was detected using nested polymerase chain reaction (PCR) in the original PS986 plant and the symptomatic regenerants but not in nonsymptomatic plants.

[Slime production, hemolysis and proteolysis in coagulase-negative staphylococci isolated in hemoculture from humans].

Of 162 strain of coagulase negative staphylococci isolated from haemocultures most frequently the following were identified: S. epidermidis (56.8%), S.

Substances with antineoplastic activity. XCVI. Some pharmacological properties and therapeutic synergism of 6-purinyl-N-(2-chloroethyl)thiocarbamate with cytosine arabinoside.

The cancerostatic effect of 6-purinyl-N-(2-chloroethyl)thiocarbamate (Cloturin VUFB, VUFB-15686) was studied in detail in mice and rats bearing transplantable tumors. The cytotoxic activities were measured by determining the incorporation rate of 5-iodo-2'-deoxy[6-3H]uridine and uniformly labeled [U-14C]amino acid mixture into trichloroacetic acid-insoluble fraction of Yoshida ascites reticulosarcoma cells during a short-term incubation with the drug. From the results obtained it follows that the new substance is therapeutically more effective in comparison with 6-mercaptopurine (NSC-755).