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At least 307 records · Page 17Linked to original sources
PubMedDate not supplied

Inflammatory myofibroblastic tumor of the larynx with anaplastic lymphoma kinase (ALK) protein overexpression. A case report.

Inflammatory myofibroblastic tumor is an uncommon lesion which mainly develops in the lung and is extremely rare in the larynx. It may be easily misinterpreted as a malignant epithelial or mesenchymal spindle cell neoplasm. Histological and clinical knowledge of this lesion is important to exclude misdiagnosis and inappropriate treatment. We report a case of inflammatory myofibroblastic tumor arising on the right vocal cord of a 23-year-old man. The tumor was composed of a mixture of spindle cells and inflammatory elements. Immunohistochemical investigation revealed that the neoplastic cells expressed anaplastic lymphoma kinase (ALK) protein.

Adult↗
PubMed1987

The effect of 5-(n-alk(en)yl)resorcinols on membranes. II. Dependence of the aliphatic chain length and unsaturation.

The effect of chain length and unsaturation on the haemolytic properties of cereal resorcinolic lipids, (5-n-alk(en)ylresorcinols), was studied using isolated saturated, monoenoic and dienoic homologues. The haemolytic activities of the homologues studied were proportional to the degree of the side chain unsaturation and inversely proportional to the chain length. At temperatures close to physiological of animal organisms the most active were mono- and di-enoic homologues of 5-n-heptadecyl and 5-n-nonadecyl resorcinols. The results might point to the importance of short-chain cereal resorcinolic lipids in animal and human nutrition.

Erythrocyte Membrane↗
PubMed1968

The alk-1-enyl group content of mammalian myelin phosphoglycerides by quantitative two-dimensional thin-layer chromatography.

Myelin phospholipids have been examined by a separation-reaction-separation procedure for two-dimensional thin-layer chromatography on silica gel. After separation in one dimension, alk-1-enyl groups are cleaved by exposure of the plates to HCl fumes. Development in the second dimension quantitatively separates acid-labile and acid-stable phosphoglycerides as well as the aldehydes released from the acid-labile phosphoglycerides. Myelin phospholipids from the central nervous systems of the rhesus monkey, squirrel monkey, ox, and mouse contain 32-36% acid-labile ethanolamine phosphoglycerides (ethanolamine plasmalogens) and 8-14% acid-stable ethanolamine phosphoglycerides. Acid-labile choline and serine phosphoglycerides account for less than 1% of the myelin phospholipids.

Alkenes↗
PubMed1972

"Plasmalogen-type" cyclic acetals: formation and conformation of the 1,3-dioxanes and 1,3-dioxolanes from 1-0-cis-alk-1'-enyl-sn-glycerols.

Acid-catalyzed cyclization of 1-O-cis-alk-1'-enyl-sn-glycerol produced four structurally and geometrically isomeric long-chain cyclic acetals of glycerol. The isomers were isolated by adsorption and gas-liquid chromatography and were identified as cis-2-alkyl-5-hydroxy-1,3-dioxane (Ia), trans-2-alkyl-5-hydroxy-1,3-dioxane (IIa), cis-2-alkyl-4-hydroxymethyl-1,3-dioxolane (IIIa), and trans-2-alkyl-4-hydroxymethyl-1,3-dioxolane (IVa). The structure of each isomer was established by chemical and spectroscopic methods. Cyclization with p-toluenesulfonic acid in boiling benzene led to a thermodynamically equilibrated mixture of isomers Ia-IVa in which the cis isomers predominated. Cyclization in acetic acid was found to be kinetically controlled, and formation of the trans isomers was relatively favored. Rearrangement of the cyclic acetal isomers did not occur in acetic acid; hence, optically active five-membered ring acetals were prepared.

Acetals↗
PubMed1977

Studies on trimethylsilyl derivatives of 1-alk-1enyl-2-acyl glycerols by gas-liquid chromatography mass spectrometry.

Trimethylsilyl derivatives of 1-hexadec-1-enyl-2-decanoyl and -2-octadecenoylglycerols and 1-octadec-1-enyl-2-decanoyl and -2-octadecenoylglycerols were subjected to analysis by a gas chromatograph mass spectrometer system. The characteristic ions are as follows: (1) ions at [M-15]+ and [M-90]+- are observed, 2 or 16 mass units less than those of the corresponding 1-alkyl-2-acyl or 1,2-diacyl derivatives; (2) the base peak is m/e 129; (3) the ion at [M-R1CH=CHO]+ or [R2COO+130]+ is present in high abundance; (4) ions at m/e 311 and 339, characteristic of trimethylsilyl derivatives of 1-hexadec-1-enyl and 1-octadec-1-enylglycerols, are due to [R1CH-CHO-1)+73]+, also confirmed from studies on the perdeuteriotrimethylsilyl derivatives; (5) several ions based on one acyl group, [R2CO]+, [R2CO+74]+ and [R2COO+74]+ are also observed.

Acylation↗
PubMed1981

Action of phospholipase A2 of rabbit neuronal and glial cells on 1,2-diacyl-, 2-acyl-1-alk-1'-enyl-, and 2-acyl-1-alkyl-glycerophosphatides.

Pronounced differences in the phospholipase A2 activities were found in neurons and glia, the enzyme activity being two- to threefold higher in neurons than in glial cells. Both phospholipases A2 hydrolyzed the 1,2-diacylglycerophosphatides more rapidly than the acylalkyl and acylalkenyl compounds. Choline plasmalogen and the corresponding alkyl derivative were cleaved at similar rates by the phospholipase A2 from both glia and neurons. There was a tendency by the neuronal phospholipase A2 to release arachidonic acid faster than linolenic acid from both phosphatidylcholine and -ethanolamine, while arachidonic acid was removed less actively from phosphatidylethanolamine by the glial enzyme. The glial phospholipase A2 showed a lag period of 10 or 20 min. Norepinephrine, injection into the lateral ventricle of the rabbit brain, stimulated the hydrolysis of the various 1,2-diacyl-, acylalkyl, and and acylalkenyl-glycerophosphatides by the phospholipase A2 from both glia and neurons.

Animals↗