Brain chopping: A new method for the rapid removal of newborn rat brain

Summary A new multi-bladed air-driven guillotine is described. This device removes newborn rat heads and slices them into several thin wafers, which facilitates freezing and permits easy regional dissection.Supp. in part by U. S. Public Health Service Grant. AA-01391.     

A glycoprotein: galactosyltransferase activity in the ascitic fluid and serum of mice with the YC8 tumor]

Tranfer of (14C)-gal from exogenous UDP(14C)-gal has been demonstrated with ovomucoid as glycoprotein acceptor in ascitic fluid sera from Balb/c mice bearing isogenic YC8 tumor. Transfer exists without ovomucoid, in great ratio in ascitic fluid and in sera from ascitic mice too, showing occurrence of endogenous acceptors, the origin of which has to be proved.     

Wirkung des Mondlichtes auf die Nachtaktivität von Zugvögeln. — Lotsenversuch an Rotkehlchen (Erithacus rubecula) und Gartenrotschwänzen (Phoenicurus phoenicurus)

Summary 8 Robins (Erithacus rubecula) and 3 Redstarts (Phoenicurus phoenicurus) were maintained in registration cages in autumn 1965. Locomotor activity was registered continuously under natural light conditions, temperature remaining fairly constant. All but one bird developed nocturnal restlessness (Zugunruhe) at least during the migratory season (Figure 1). 8 out of 10 birds showed a higher mean activity at night during full moon phases than during new moon phases; 2 birds showed roughly equal activity during both phases of the cycle (Figure 2). Since the measurements of nocturnal activity at least partially correspond to migratory motivation, it is reasonable to assume that free-living individuals of the species investigated are more active during nights in the full moon phase and possibly fly farther than at dark nights.     

Cytologie fine des cellules interstitielles du testicule du poissonLebistes reticulatus R.

Summary The active interstitial cells of the testis ofLebistes reticulatus R. have numerous, big, dense mitochondria of tubular structure and a developed endoplasmic reticulum. The formation of lipochrome pigment granules corresponds to a degenerative evolution of these cells.