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L A Tabak

Publications and source records attributed to L A Tabak.

82 records · Page 5Linked to original sources
PubMed1982

Characterization of cysteine-containing phosphoproteins from human submandibular-sublingual saliva.

Members of a family of acidic proteins taken from human submandibular-sublingual saliva were designated cysteine-containing phosphoproteins, since they could be distinguished from other salivary phosphoproteins by the presence of half-cystine. These molecules consisted of a single peptide chain of approximately 14,000 daltons. Their isoelectric points ranged from 4.3 to 5.9. Two groups (C2 and C3) were O-phosphorylated. Their charge heterogeneity was apparently due to variations in content of phosphate and acidic and basic amino acids.

Animals↗
PubMed1982

Lipid composition of submandibular saliva from normal and cystic fibrosis individuals.

The submandibular saliva of patients with cystic fibrosis was found to contain about 66% more lipids/100 ml of saliva than that of normal individuals and exhibited elevated levels of neutral lipids, phospholipids, and glycolipids. No significant differences were noted in the proportions of individual neutral lipid and phospholipid components present in both types of samples. The glycolipids of normal saliva consisted entirely of glyceroglucolipids, whereas those of cystic fibrosis saliva, in addition to glyceroglucolipids, also contained small amounts of glycosphingolipids. These quantitative and qualitative differences may affect the physicochemical properties of the secretion.

Adolescent↗
PubMed1982

Adherence of Streptococcus sanguis to salivary mucin bound to glass.

This study demonstrated that human submandibular-sublingual saliva (HSMSL) provided a better substrate than did whole saliva or parotid saliva for the binding of Streptococcus sanguis in a glass adherence assay. Additional evidence indicated that the lower molecular weight salivary mucin in HSMSL was involved in these interactions. Mucin's sialic acid residues were found to play a major role in mediating the binding of certain strains of Streptococcus sanguis.

Adhesiveness↗
PubMed1982

Isolation and partial characterization of a genus common antigen and species specific antigen of Capnocytophaga.

Sixteen strains of Capnocytophaga were isolated from the pocket of a localized juvenile periodontitis patient. These strains were divided into four groups on the basis of morphological and physiological traits. Strains from group I and group III were identified as C. ochracea and group II as C. sputigena. An antigen common to genus Capnocytophaga was purified utilizing immunoabsorbent chromatography from lysates obtained by sodium dodecyl sulfate treatment of C. ochracea strain S1. An antigen specific to C. ochracea was prepared by sequential gel filtration and preparative isoelectric focusing. The genus common and species specific antigens isolated were immunologically unique and pure when tested by immunoelectrophoresis and immunodiffusion against rabbit antisera prepared to Capnocytophaga and other gram-negative rods. The genus common antigen was susceptible to trypsin and pronase digestion, was soluble in chloroform-methanol, but was unaltered by ribonuclease and deoxyribonuclease treatments and periodate oxidation. Antigenicity of the species specific antigen was destroyed by periodate oxidation. The genus common antigen appeared to be lipid-associated protein, while the species specific antigen consisted mainly of carbohydrate. These specific immunological reagents would be valuable in diagnosing and monitoring diseases.

Age Factors↗
PubMed1979

Purification and characterization of monkey salivary mucin.

Highly purified mucin was prepared from monkey (Macaca arctoides) extraparotid saliva by sequential chromatography on Sephadex G-200 (followed by reduction and alkylation of void volume materials), Sepharose CL-2B with 6 M urea, and CM52 cellulose with 6 M urea. Purity was critically ascertained by anion exchange chromatography, ultracentrifugal analysis, isoelectric focusing, sodium dodecyl sulfate-polyacrylamide electrophoresis, and crossed immunoelectrophoresis. Use of crossed immunoelectrophoresis to examine mucin preparations has not been previously reported. This technique was useful for assessing purity and displaying charge and size microheterogeneity in the purified S-carboxymethylated mucin. Threonine and serine comprised 37.8% of the total amino acids while the oligosaccharide moiety contained N-acetyl-glucosamine, N-acetylgalactosamine, fucose, galactose, N-acetylneuraminic acid, and sulfate. Following alkaline borohydride treatment, the carbohydrate chains were found to be linked O-glycosidically between N-acetylgalactosamine and threonine (serine).

Amino Acids↗