Comparison of the Effects of Electrolytic and Chemical Destruction of the Red Nucleus on the Compensatory Capacity of Rats With Rubrospinal Tract Lesions

Transection of the rubrospinal tract in rats, performed before lesion of the red nucleus, resulted in the facilitated recovery of motor activity and operantly conditioned reflexes. Such facilitation was absent when the red nucleus is lesioned alone. This phenomenon is explained by the switching of descending influences on the corticospinal tract through the participation of the following system: red nucleus—inferior olive—cerebellum—ventrolateral thalamic nucleus—cerebral cortex. The above mentioned facilitating influence on the recovery process was particularly prominent in rats with quinolinic acid-induced lesion of the red nucleus. Under these conditions, the cerebellar ascending fibers to the ventrolateral thalamic nucleus were preserved. Decreased facilitated recovery following electrolytic lesion of the red nucleus suggests the existence of additional cerebello-cortical pathways for the realization of the switching phenomenon

Enhanced Behavioral Recovery from Sensorimotor Cortex Lesions After Pyramidotomy in Adult Rats

Unilateral transection of the bulbar pyramid, performed before the ablation of the ipsilateral sensorimotor cortex, has been shown to facilitate the recovery of operantly conditioned reflexes and compensatory processes in rats. Such enhanced behaviorai recovery was absent when only the sensorimotor cortex was ablated. This phenomenon is explained by the switching of motor activity under the control of the cortico-rubrospinal system. Switching of the descending influences is accomplished through the following loop: cortico-rubrai projectionred nucleus-inferior olive-cerebellum-thalamuscerebral cortex. This suggests that a preliminary lesion of the peripheral part of the system, represented by a descending spinal projection, facilitates the recovery processes to develop during the subsequent destruction of its central part

The electromagnetic effects in Ke4K_{e4} decay

The final state interaction of pions in $K_{e4}$ decay allows one to obtain the value of the isospin and angular momentum zero $\pi\pi$ scattering length $a_0^0$.We take into account the electromagnetic interaction of pions and isospin symmetry breaking effects caused by different masses of neutral and charged pions and estimate the impact of these effects on the procedure of scattering length extraction from $K_{e4}$ decay.Comment: 8 pages,1 figur

Final state interaction in kaons decays

The kaons decays to the pairs of charged and neutral pions are considered in the framework of the non-relativistic quantum mechanics. The general expressions for the decay amplitudes to the two different channels accounting for the strong interaction between pions are obtained. The developed approach allows one to estimate the contribution of terms of any order in strong interaction and correctly takes into account the electromagnetic interaction between the pions in the final state.Comment: 8 page

Modern options in coloproctology: transanal endoscopic surgery

The aim of review. To estimate results of transanal endoscopic resection of rectal tumors and to analyze literature data devoted to this method.Key points. Experience of Rostov Scientific Research Institute of Oncology has allowed to confirm literature data and to turn out perspective approaches to application of transanal endoscopic resection of tumors. It was found, that transanal endoscopic resection of benign tumors and early stages of malignant tumors of rectum is a modern, highly effective method of treatment that provides radical tumor removal within any layer of rectal wall and adjacent mesorectal soft tissue due to application of exact tools and precision technic of the intervention, it preserves intestinal function as well.Conclusion. Described options allow recommending this method to broad application in surgical practice. According to received results it is possible to conclude, that transanal endoscopic tumor resection can become a method of choice at initial stages of rectal cancer

The isospin symmetry breaking effects in Ke4K_{e4} decays

The Fermi-Watson theorem is generalized to the case of two coupled channels with different masses and applied to final state interaction in $K_{e4}$ decays. The impact of considered effect on the phase of the $\pi\pi$ scattering is estimated and shown that it can be crucial for scattering lengths extraction from experimental data on $K_{e4}$ decays

A Complete Version of the Glauber Theory for Elementary Atom - Target Atom Scattering and Its Approximations

A general formalism of the Glauber theory for elementary atom (EA) - target atom (TA) scattering is developed. A second-order approximation of its complete version is considered in the framework of the optical-model perturbative approach. A `potential' approximation of a second-order optical model is formulated neglecting the excitation effects of the TA. Its accuracy is evaluated within the second-order approximation for the complete version of the Glauber EA-TA scattering theory.Comment: PDFLaTeX, 10 pages, no figures; an updated versio

Familial adenomatosis of the colon: current state of the problem

The urgency of the problem of familial adenomatosis of the colon (FAC) is caused both by the severity of the disease with the inevitable development of cancer without timely treatment, and the involvement of the patient's blood relatives in this problem. Due to the rare incidence of this disease, many issues require discussion. Aim. To determine the possibility of timely treatment of FAC patients maintaining a satisfactory quality of life. Materials and methods. The data on 5 FAC patients and 12 their blood relatives were studied. Clinical, endoscopic and genetic characteristics of the disease and treatment were analyzed. Results. demonstrated that family history, genetic and endoscopic examinations allow diagnosis of FAC. Colectomy with rectal resection and the creation of a small intestine reservoir with reservoir-rectal anastomosis provide a sufficient quality of life for patients. Examination of the patient's blood relatives reveals new patients requiring additional examination and treatment. Conclusion. The problem of FAC is multidisciplinary and involves therapists, gastroenterologists, pediatricians, geneticists, endoscopists, radiologists, surgeons and oncologists. Only a timely diagnosis can help the patient to undergo radical treatment before the development of colon cancer