Ligand Exchange Reaction between Ferrocene and Multiwalled Carbon Nanotubes: A Contemporary Approach.

Ligand exchange reaction (LER) between carbon nanoparticles and ferrocene (CpFe) was conducted several times, but there was no convincing evidence of half-sandwich CpFe coordination to multiwalled carbon nanotubes (MWCNT). In this study, MWCNT is modified by LER with ferrocene using AlCl/Al as a catalytic system. The modified MWCNT (Fc-MWCNT) are investigated for better understanding of the processes taking place on the surface of MWCNT using different spectroscopic and electrochemical methods.

Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes.

Recently, there has been an active search for new modifiers to create hybrid polymeric materials for various applications, in particular, membrane technology. One of the topical modifiers is metal-organic frameworks (MOFs), which can significantly alter the characteristics of obtained mixed matrix membranes (MMMs). In this work, new holmium-based MOFs (Ho-MOFs) were synthesized for polyether block amide (PEBA) modification to develop novel MMMs with improved properties.

-Interactions in 1,8-bis(dimethylamino)naphthalene -ketimine cations facilitate [1,5]-hydride shift: selective synthesis of 1,2,3,4-tetrahydrobenzo[]quinazolines.

Selective heterocyclization leading to 1,2,3,4-tetrahydrobenzo[]quinazolines from -ketimines of 1,8-bis(dimethylamino)naphthalene () under acid catalysis has been revealed. In contrast to the rather unreactive ,-dimethylaniline -ketimine, readily undergo this transformation without an additional catalyst. This distinction in the reactivity underscores the importance of the second -NMe group in , which facilitates a [1,5]-hydride shift and the subsequent cyclization.

Conditions for Production of Composite Material Based on Aluminum and Carbon Nanofibers and Its Physic-Mechanical Properties.

Aluminum-based metallic matrix composites reinforced by carbon nanofibers (CNFs) are important precursors for development of new light and ultralight materials with enhanced properties and high specific characteristics. In the present work, powder metallurgy technique was applied for production of composites based on reinforcement of aluminum matrices by CNFs of different concentrations (0~2.5 wt%).

[Informative value of radiodiagnosis methods of pyelo-ureteral strictures in kidney anomaly].

A total of 98 patients aged 18-67 years (mean age 42.5 +/- 10.3 years) suspected to have a pelviureteral stricture (PUS) were examined using ultrasound investigation in B-mode (BUI), excretory urography (EU), angiography, slice and multislice computed tomography (SCT, MSCT).

Challenges in providing drug user treatment services in Russia: providers' views.

The estimated number of opiate users in Russia is 2,000,000 and heroin consumption is continuing to increase. The Russian government is discussing the initiation of compulsory treatment to bring illegal drug users to the treatment services. At the same time, there is no access to the evidence-based treatment for opiate addiction such as methadone and buprenorphine maintenance programs.

[Dynamics of distribution of the low molecular weight fraction of cerebral in rat tissues upon intranasal administration].

A homogeneous low-molecular-weight fraction (MW, 350-500 Da) separated from a ready-to-use commercial form of the new neurotropic drug cerebral (for amino acid composition see Arkh. Psikh. 3(18), 138-143 (1998)) increases the survival of experimental rats upon experimental hemorrhagic stroke (HS).

[Effect of nooglutil on rats with intracerebral posttraumatic hematoma (hemorrhagic stroke)].

The effect of the new nootropic drug nooglutyl, a positive modulator of AMPA-subtype glutamatergic receptors, was studied in rats with a model hemorrhagic stroke (HS)--posttraumatic hematoma induced by cerebral tissue destruction in the capsule interna region. Single intraperitoneal injections of nooglutyl (10 and 20 mg/kg) 3-4 h after operation decreased the HS-induced neurological deficiency, restored the coordination of movements, improved the passive avoidance reaction retrieval, and prevented the loss of experimental animals. The results show evidence of a pronounced neuroprotector action of nooglutyl in rats with the HS model.

Altered expression of NCAM in hippocampus and cortex may underlie memory and learning deficits in rats with streptozotocin-induced diabetes mellitus.

Neurological and structural changes are paralleled by cognitive deficits in diabetes mellitus. The present study was designed to evaluate the expression of neural cell adhesion molecules (NCAM) in the hippocampus, cortex and cerebellum and to examine cognitive functions in diabetic rats. Diabetes was induced in male albino rats via intraperitoneal streptozotocin injection.

Increase of glial fibrillary acidic protein and S-100B in hippocampus and cortex of diabetic rats: effects of vitamin E.

Glial interactions with neurones play vital roles during the ontogeny of the nervous system and in the adult brain. Physical and metabolic insults cause rapid changes in the glial cells and this phenomenon is called reactive gliosis. One of the important events during astrocyte differentiation is the increased expression of glial markers, glial fibrillary acidic protein (GFAP) and S-100B protein.

Altered glial fibrillary acidic protein content and its degradation in the hippocampus, cortex and cerebellum of rats exposed to constant light: reversal by melatonin.

Reactive astrocytosis is a well-known phenomenon that occurs rapidly after physical or metabolic injury to the brain. One of the important events during astrocyte differentiation is the increased expression of glial fibrillary acidic protein (GFAP), a member of the family of intermediate filament structural proteins. Free radicals are neurotoxic and free radical scavengers have been shown to protect the brain against neurotoxic damage.

A novel role for melatonin: regulation of the expression of cell adhesion molecules in the rat hippocampus and cortex.

Neural cell adhesion molecules (NCAMs) are members of the immunoglobulin superfamily and are involved in synaptic rearrangements in the mature brain. There are three major NCAM forms: NCAM 180, NCAM 140 and NCAM 120. Several studies report that NCAMs play a central role in memory.

[Urinary bladder cancer in patients with tuberculous and post-tuberculous cystitis].

125 patients with tuberculous and posttuberculous cystitis were examined using cytological test of the aspirate from the bladder for atypical cells and histological investigation of the biopsy. Cancer of the bladder has developed in long-term chronic tuberculous or posttuberculous cystitis in 4% of the cases. The best objective method of the diagnosis was histological examination of the biopsy obtained from cancer-suspected sites of the bladder mucosa.

Extracellular pH modulates kinetics of the Na(+),K(+)-ATPase.

To investigate effects of pH on the Na(+),K(+)-ATPase, we used the Xenopus oocytes to measure transient charge movements in the absence of extracellular K(+), and steady-state currents mediated by the pump as well as ATPase activity. The activity of purified Na(+), K(+)-ATPase strongly depends on pH, which has been attributed to protonation of intracellular sites. The steady-state current reflects pump activity, the transient charge movement voltage-dependent interaction of external Na(+) ions with the pump molecule and/or conformational changes during Na(+)/Na(+) exchange.

[Urogenital tuberculosis in the Ukraine population].

The prevalence and incidence rates of urogenital tuberculosis in the Ukraine in the past 10 years were studied. They tended to decrease in the first period (1988-1992) and to become stable in the second period (1993-1997), being equal to 10.71 and 1.

Mutations of Ser-23 of the alpha1 subunit of the rat Na+/K+-ATPase to negatively charged amino acid residues mimic the functional effect of PKC-mediated phosphorylation.

The Na+/K+-ATPase is a target protein for protein kinase C (PKC). The PKC-mediated phosphorylation of the rat alpha1 subunit at Ser-23 results in the inhibition of its transport function. To understand the molecular basis of the inhibition by PKC, the Ser-23 in the rat alpha1 subunit has been replaced by negatively (Asp, Glu) or positively (Lys) charged, or uncharged (Gln, Ala) residues, and the mutants were expressed in Xenopus oocytes.

[Intravascular laser radiation of blood in the multimodality treatment of patients with urogenital tuberculosis].

Laser therapy was performed in 45 patients with tuberculosis of the urinary system and male genitals. The radiation was found to have a positive action on the patients' general condition and short-term immunomodulating effect. Following a month, immunological parameters became baseline or near-baseline.

[Device for examining the state of bronchial patency using the acoustic method].

An acoustic device was proposed to detect bronchial obstruction by analysing a noise process in the laryngotracheal region at the forced expiration. Clinical trials were under way, which revealed persistent diagnosis signs of bronchial patency impairments associated with changes in the duration and shape of the envelope of a recorded acoustic signal, as well as deviations of its spectral characteristic.