Variations in the content of some trace elements and macroelements in the hippocampus of rats during learning and memory retrieval after destruction of the entorhinal cortex.

We studied variations in the concentration of Na, K, Ca, and Mg in the hippocampus of rats with damaged entorhinal cortex. The concentration of Mg, Na, K, and Ca remained practically unchanged, while the content of Zn and Cu increased during learning and memory retrieval in animals with damaged entorhinal cortex. Our results indicate that Zn and Cu, constituents of metalloproteins and metalloenzymes, play an important role in hippocampal function.

A study of the radiation environment on board the Space Shuttle flight STS-57.

A joint NASA-Russian study of the radiation environment inside a SPACEHAB 2 locker on Space Shuttle flight STS-57 was conducted. The Shuttle flew in a nearly circular orbit of 28.5 degrees inclination and 462 km altitude.

Experimental and calculated LET distributions in the Cosmos-2044 biosatellite orbit.

During the flight of the Cosmos-2044 biosatellite, joint U.S.S.

Linear energy transfer (LET) spectra of cosmic radiation in low Earth orbit.

Integral linear energy transfer (LET) spectra of cosmic radiation (CR) particles were measured on five Cosmos series spacecraft in low Earth orbit (LEO). Particular emphasis is placed on results of the Cosmos 1887 biosatellite which carried a set of joint U.S.

Linear energy transfer spectra of cosmic radiation aboard the Cosmos-1129 satellite.

The most important characteristic of the hazard due to cosmic radiation is the spectrum of linear energy transfer (LET), which enables one to estimate the dose equivalent. This has prompted us to study LET spectra of cosmic radiation aboard Cosmos-1129 using nuclear emulsions as a threshold detector.

[Immunogenic DNA of Shigella sonnei bacteriophage].

Immunogenic and some other properties of Sh, sonnei "Ufa" phage DNA were investigated. This DNA has been shown to possess high immunogenic activity indicating the presence of an unusual base. The base is distinct from 5-OmC, glucosylated 5-OmC, 5-OmU or dihydroxypentyluracil.

[Immunochemical and molecular biological characteristics of dysentery phages].

Molecular organization of DNA of six dysentery phages was studied for their classification. The pattern of glucosilation of their DNA was determined by an immunochemical method and the test of competitive hybridization established the degree of homology of these DNA in relation to T4 phage DNA. Four of the phages (DDVI, Zonne "Gorkyi" Zonne "Czechoslovakia", Zonne "Poland") were shown to belong to the group of T-even phages by their pattern of DNA glucosilation and by their capacity to inhibit DNA T4X3H DNA T4 hybridization.