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 58,342 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Although the phagocytic action of Kupffer cells is well known, such a phenomenon has not been well documented for hepatocytes. Following the injection of a suspension of egg lecithin-coated silicon particles (0.5-1.5 microns in diameter) into the portal vein of rats, Kupffer cells showed minimal phagocytotic action, which was in contrast to the hepatocytes which displayed numerous phagocytized silicon particles. By comparison, when noncoated silicon particles of the same diameter as those that were coated were injected into the portal vein, the opposite observation was made. There was no uniformity in the ability of the hepatocytes to phagocytize either coated or noncoated particles from one lobule to another. Some showed active phagocytosis, while in others no evidence of such a process was observed. These data provide strong evidence for the selective phagocytic action of liver hepatocytes.
Anat Rec 1992 Aug
PMID:Evidence that hepatocytes can phagocytize exogenous substances. 162 13

The ultrahistochemical analysis of apical granules in the epithelial cells, i.e., granular cells, of the amphibian urinary bladder using the N,N-naphthaloylhydroxylamine procedure identified the presence of calcium in these structures. Subsequent analytical microscopy employing fresh-frozen ultrathin cryosections for X-ray microanalysis of the granules further confirmed the above histochemical findings. In addition to calcium, elemental analysis indicated the presence of magnesium, phosphorus, sulfur, silicon, potassium, and chlorine either within or in close proximity to the granules. The possibility that these granules function as subcellular compartments for the uptake and storage of calcium ions, in a way similar to mitochondria, and thus function in intracellular calcium homeostasis, is discussed. Additionally, a role for this cation in the secretion of granular glycoproteins, i.e., stimulus-secretion coupling, is hypothesized.
Anat Rec 1987 Jul
PMID:Histochemical and elemental localization of calcium in the granular cell subapical granules of the amphibian urinary bladder epithelium. 311 41

Eighteen healthy beagle dogs of both sexes were each given 0, 2 or 4 mg/kg marbofloxacin intravenously before the subcutaneous implantation of a silicon tissue cage. Two millilitres of a suspension containing 1.3 x 10(4) colony forming units (CFU)/ml of Staphylococcus intermedius were then injected into the cage 15 minutes after the intravenous injection. The dogs were clinically assessed immediately, and then two, four, eight and 24 hours after the challenge. Samples of inflammatory fluid were harvested at the same times in order to count staphylococci and to assay marbofloxacin concentrations. Blood samples were taken in order to assay plasma marbofloxacin levels. The staphylococcal counts were lower in both treated groups than in untreated dogs (P < 0.01). All the clinical criteria were similar in the three groups. The concentration of marbofloxacin was similar in plasma and inflammatory fluid. Both doses were well tolerated and no adverse reactions were observed.
Vet Rec 1997 Feb 22
PMID:Prevention of surgical infections in dogs with a single intravenous injection of marbofloxacin: an experimental model. 906 72

In 1987, two research groups published the first-ever reports on the synthesis of silylene complexes and presented structural evidence. Since then, a range of synthetic methods have been developed and a number of silylene complexes have been prepared. In 1988, we reported on the first base-stabilized bis(silylene) complexes that can be regarded as being masked silyl(silylene) complexes. These complexes occupy a unique position among silylene and silyl(silylene) complexes in that they provide a convenient tool for studying the reactivity of coordinated silylenes. They are stable enough to be isolated, but the bond between the silylene silicon atom and the internal base can easily be cleaved by thermal perturbation to generate real silyl(silylene) complexes. To date, a number of base-stabilized bis(silylene) complexes have been prepared in which the central metals range from group 5 to group 9. Only two base-free silyl(silylene) complexes have been prepared. One is prepared by reacting a platinum complex with a stable silylene; the other is produced by the photolysis of a tungsten complex in the presence of a hydrodisilane.
Chem Rec 2002
PMID:Synthesis of silylene and silyl(silylene)metal complexes. 1236 54

Silica-based hybrid organic-inorganic materials prepared by sol-gel chemistry exhibit chemical and physical properties revealing their anisotropic organization. Besides the opportunities that these phenomena open for the preparation of new materials, they also provide arguments for the chemist looking for better comprehension and control of the solid's organization.
Chem Rec 2003
PMID:Auto-organization in sol-gel type polycondensation: a door to the nanosciences. 1273 Oct 82

This article describes a variety of monolayers anchored directly onto silicon surfaces without an oxide interlayer, their formation mechanisms, their technological applications, and our personal views on the future prospects for this field. The chemical modification of non-oxidized silicon surfaces utilizing monolayers was first reported in 1993. The basic finding that a non-oxidized silicon surface could be neutralized with alkyl chains through direct covalent linkage, i.e., silicon-carbon, has offered chemical scientists ease of handling even in an ambient environment and, thus, research has been predictably focused on forming anti-stiction coating films for nano- and micro-electromechanical systems (NEMS/MEMS). Such surface reforming has also been achieved by using other monolayers, which form interfacial bonds, e.g., silicon-nitrogen and silicon-oxygen. The resultant monolayer surfaces are useful for silicon-based applications including molecular electron transfer films, monolayer templates, molecular insulators, capsulators, and bioderivatives. Such monolayers are applicable not only for surface modification, but also for manipulating individual nanomaterials. By modifying the terminal groups of monolayers with nanomaterials including nanocrystals and biomolecules, the nanomaterials can remarkably be immobilized directly onto non-oxidized silicon surfaces based on the formation mechanisms of the monolayer. Such immobilizations will revolutionize the analysis of the specific features and capabilities of individual nanomaterials. Furthermore, the path will be opened for the development of more advanced monolayer-derived chip technology. To achieve this goal, it is extremely important to thoroughly understand the functionalization processes on silicon, since the resultant internal structures and properties of monolayer-derivative silicon may strongly depend on their course of formation.
Chem Rec 2005
PMID:Monolayer-derivative functionalization of non-oxidized silicon surfaces. 1588 8

This paper reports on recent progress in the synthesis of nanostructured siloxane-organic hybrids based on the self-assembly of amphiphilic silicon-based precursors. A variety of ordered hybrid materials have been obtained by molecular design of the precursors. Alkoxysilanes and chlorosilanes with covalently attached hydrophobic organic tails are hydrolyzed to form amphiphilic molecules containing silanol groups, leading to the formation of layered (lamellar) structures. Transparent and oriented thin films of lamellar hybrids were prepared by the reaction in the presence of tetraalkoxysilane. In addition, the design of molecules having alkyl chains and large oligosiloxane heads led to the formation of mesophases consisting of cylindrical assemblies, providing a direct pathway to ordered porous silica. The synthesis, structural features, and formation processes of these hybrid mesostructures are discussed.
Chem Rec 2006
PMID:Designed synthesis of nanostructured siloxane-organic hybrids from amphiphilic silicon-based precursors. 1656 84

Rats are widely used for studies of pulmonary toxicology and lung disease. Several studies suggest nominal geometric parameters describing the architecture of the rat airway. However, intersubject variance has never been reported due to the huge effort and time to take these manual measurements. In this study, we present statistics of the branching pattern of six healthy male Sprague Dawley rats by automatically analyzing computed tomography images of silicon casts of their airways. Details of branching characteristics and also intersubject variance are presented. In addition, this study shows that mean and standard deviation of many geometric parameters insufficiently represent pulmonary architecture because some, such as diameter-asymmetry, are not normally distributed. Detailed statistics including inter- and intrasubject variance and distribution of the geometric parameters will aid in constructing more realistic airway models for particle transport and studies of normal and abnormal respiratory physiology.
Anat Rec (Hoboken) 2008 Aug
PMID:Pulmonary architecture in the conducting regions of six rats. 1856 Nov 95

This paper is a review of my 40 years of research at Kyoto, Sagamihara, and Yokohama, all based on the generation of hyper-coordinate metal species such as ate complexes and pentacoordinate silicates. The topics are: (i) carbenoid reagents for carbon-carbon bond-forming reactions, (ii) nucleophilic substitution at acetal carbons using aluminate reagents, (iii) preparation of magnesium enolates and its reaction with nitriles, (iv) Cr(II) reagents for reduction of organic halides and highly selective carbon-carbon bond formation, (v) organic synthesis with organosilion reagents/fluoride ions, (vi) cross-coupling reaction of organosilicon compounds, and (vii) silicon-based conjugate addition to alpha,beta-unsaturated carbonyl acceptors.
Chem Rec 2008
PMID:Selective organic synthesis through generation and reactivity control of hyper-coordinate metal species. 1910 64

This paper describes the recent advances in the syntheses of organophosphines by forming several types of phosphorus-carbon bonds via activation of the phosphorus-silicon bond of silylphosphines. In this account, the activation methods are classified into three types: nucleophile-induced activations, reactions with Lewis acid-activated electrophiles, and transition metal catalyzed reactions. Nucleophile-induced activations of silylphosphines, especially by a fluoride, generated a reactive phosphide equivalent for selective formation of a P-C bond. Silylphosphines also reacted selectively with Lewis acid-activated electrophiles. The Lewis acid mediated/catalyzed additions and substitutions, to form sp3-carbon-phosphorus bonds including an asymmetric reaction, are described. Several important types of transition metal catalyzed reactions of silylphosphines are also mentioned in this account. Selective formation of a P-C bond is achieved through these activations to produce a variety of functional organophosphines including optically active ones.
Chem Rec 2009
PMID:Organophosphine syntheses via activation of the phosphorus-silicon bond of silylphosphines. 1973 48


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