Optical bleaching of freshly spun polyacrylonitrile fibres

Conclusions A new effective optically bleaching substance of the cationic type in liquid form has been developed.The advisability of using it to bleach freshly spun polyacrylonitrile fibre by a continuous method has been demonstrated.Translated from Khimicheskie Volokna, No. 2, pp. 42–43, March–April, 1990.     

Stimulation of gluconeogenesis with 1,3-butanediol in the perfused rat liver

An intensified synthesis of glucose is observed in gluconeogenesis from endogenous precursor only for the first 30 min of perfusion. Pyruvate introduction into the medium raises phosphoenolpyruvate carboxykinase and fructose-1,6-diphosphatase activities in the liver and determines maintenance of the glucose formation high rate for 90 min of perfusion. 1,3-butanediol is found to have a stimulating effect on gluconeogenesis from pyruvate. Introduction of 1,3 bytanediol into perfusate decreases the redox state of free NAD-pairs, increases the content of phosphoenolpyruvate, malate. ATP and the phosphoenolpyruvate carboxykinase and fructose-1.6-diphosphatase activity in the perfused liver.     

The functional organization of the posterior lateral nucleus of the rat hypothalamus

It has been demonstrated that the posterior lateral thalamic nucleus of the rat receives information from the visual, somatic and auditory systems. Some of the neurons (63%) have a convergent input from these systems, although these neurons exhibit functional specificity with respect to the predominant inhibitory influence of the background activity of one of the sensory systems investigated. The other part of the neurons (37%) receives information only from the visual or somatic system, these neurons exhibiting excitatory phasic reaction to sensory stimuli.     

The effect of inhibitors of DNA topoisomerase II on the radiosensitivity, repair and conformational changes in the chromatin in mammalian cells

1. The pharmacological properties of four synthetic analogues of the wasp neurotoxin, Vespulakinin 1, were studied using a cascade of mammalian smooth muscle preparations and the synaptic transmission from the cockroach cercal nerves to a giant interneuron. 2. All analogues have an extremely slow bradykinin-like effect on the smooth muscles. The carbohydrate-free and the two mono-glycosylated analogues are about equally active with bradykinin. 3. The double glycosylated derivative is about 5 times more potent than bradykinin. 4. All analogues have two different effects on synaptic transmission in the insect CNS--at first a direct and reversible block of excitatory nicotinic transmission with a concurrent activation of the inhibitory GABA-ergic system and, secondly, a delayed irreversible block of the transmission, comparable to the block described earlier for bradykinin and Thr6-bradykinin. 5. For the synaptic transmission in the insect CNS the double glycosylated kinin is about 5 times more potent than bradykinin.     

Excitation magnetic flux losses in acyclic motors with transverse magnetization

A theoretical analysis of the distribution of magnetic excitation flux components caused by permanent magnets in acyclic torquer motors with transverse flux magnetization is presented in the article. Magnetic leakage fluxes were assessed by formulas obtained for the computation of said fluxes. Assessments of their impact and recommendations to reduce leakage fluxes in acyclic motors are also given