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1. Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps.

Author

Fernandes, Susana and Duarte, Ana Paula

Subjects
EUCALYPTUS globulus, PAPER sizing, PAPERMAKING, ANHYDRIDES, PERMANENT paper, WETTING, LIQUIDS, PAPER, FIBERS
Abstract

The article discusses the influence of wet-end variables on the sizing efficiency of alkenyl succinic anhydride on fine papers created with Eucalyptus globulus kraft pulps. It states that the purpose of paper sizing is to make paper more resistant to liquid penetration. It explains that alkenyl succinic anhydride is a synthetic agent used in sizing that is usually involved in alkaline papermaking. It mentions that the synthetic agent has a fast curing size, but it can lose its ability if it is in contact with water.

Published
2006

2. Preparation and characterization of synthetic peptidyl-aminoacyl-tRNA derivatives

Author

Shlomith Yankofsky, S.A. Yankofsky, Ephraim Katchalski, and Uriel Z. Littauer

Subjects
Electrophoresis, Paper, Polymers, Stereochemistry, Phenylalanine, Polynucleotides, Tritium, environment and public health, Biochemistry, Genetics and Molecular Biology (miscellaneous), Anhydrides, Ligases, chemistry.chemical_compound, Ribonucleases, RNA, Transfer, Moiety, Dimethyl Sulfoxide, Amino Acids, Solubility, chemistry.chemical_classification, Aspartic Acid, Carbon Isotopes, Aminoacyl-tRNA, Alanine, Chemistry, Esters, Sarcosine, Stereoisomerism, Valine, Hydrogen-Ion Concentration, Amino acid, enzymes and coenzymes (carbohydrates), Polymerization, Polynucleotide, Yield (chemistry), Transfer RNA, bacteria, Peptides
Abstract

Methods for the preparation of various peptidyl-aminoacyl-tRNA derivates are described. Aminoacyl-tRNA's are allowed to initiate the polymerization of different N-carboxy amino acid anhydrides in alkaline dimethylsulfoxide-water (97:3, v/v) to yield the corresponding peptidyl-aminoacyl-tRNA's. Near quantitative yields of ( dl -Ala)n-Val-tRNA, (sarcosyl)n-Val-tRNA, ( l -Asp-β-OBzl)n-Val-tRNA, ( l -Glu-γ-OBzl)n-Val-tRNA, and ( l -Phe)n-Val-tRNA were so obtained. In addition to peptidyl-aminoacyl-tRNA products, the polymerization reaction generates free peptides. The latter products are due to water-initiated polymerizations. Depending on the solubility properties of the particular free polyamino acid involved, one of three procedures can be used to separate it from peptidyl-aminoacyl-tRNA and tRNA. Fractionation of peptidyl-aminoacyl-tRNA away from tRNA is not, however, obtained and the two are recovered together as an aqueous mixture. The length of the petidyl moiety was found to be heterogenous in all the peptidyl-aminoacyl-tRNA derivatives tested. It was never very long relative to its tRNA carrier. The stability of the ester linkage between peptidyl-aminoacyl and polynucleotide in several peptidyl-aminoacyl-tRNA's was also studied. Although different derivatives evidenced different stabilities, all were appreciably more stable then their parent aminoacyl-tRNA compound.

Published
1970

3. Cost-effectiveness relationships in odor control

Author

Robert W. Okey, Robert C. Haring, and Amos Turk

Subjects
Paper, Drug Industry, Cost effectiveness, Computer science, Detergents, Phthalic Acids, Soaps, General Biochemistry, Genetics and Molecular Biology, Anhydrides, History and Philosophy of Science, Air Pollution, Paint, Oils, Volatile, Industry, Food-Processing Industry, Pesticides, Fertilizers, Drug industry, Coke, Vehicle Emissions, Sewage, Construction Materials, General Neuroscience, Oxidation reduction, Agriculture, Tanning, United States, Resins, Synthetic, Petroleum, Odor control, Chemical Industry, Textile Industry, Metallurgy, Odorants, Costs and Cost Analysis, Biochemical engineering, Adsorption, Rubber, Oxidation-Reduction
Published
1974

4. A partial amino acid sequence in the heavy chain of a rabbit antibody to group C streptococcal carbohydrate

Author

Julian B. Fleischman

Subjects
Electrophoresis, Paper, Chromatography, Paper, Iodoacetates, Biochemistry, Antibodies, Anhydrides, Animals, Trypsin, Amino Acid Sequence, Sulfhydryl Compounds, Amino Acids, Peptide sequence, Immunoelectrophoresis, Edetic Acid, Rabbit Antibody, Heavy chain, Carbon Isotopes, Vaccines, Cyanides, Chemistry, Polysaccharides, Bacterial, Maleates, Streptococcus, Carbohydrate, Chromatography, Ion Exchange, Precipitin Tests, Immunoglobulin G, Chromatography, Gel, Rabbits, Peptides, Oxidation-Reduction
Published
1971

5. Control of pyrimidine biosynthesis in human lymphocytes. Induction of glutamine-utilizing carbamyl phosphate synthetase and operation of orotic acid pathway during blastogenesis

Author

K, Ito and H, Uchino

Subjects
Adult, Electrophoresis, Paper, Chromatography, Paper, Uracil Nucleotides, Glutamine, Anhydrides, Cell Line, Glutamates, Culture Techniques, Lectins, Chemical Precipitation, Humans, Phosphoric Acids, Lymphocytes, Uracil, Orotic Acid, Carbon Isotopes, Sulfates, Hydrolysis, Phosphotransferases, Cell Differentiation, Carbon Dioxide, Chromatography, Ion Exchange, Quaternary Ammonium Compounds, Pyrimidines, Enzyme Induction, Dactinomycin, Citrulline, Puromycin, Carbamates
Published
1971

6. A micro-technique for performing reactions with volatile reagents

Author

J. K. Norymberski and Anne Riondel

Subjects
Pharmacology, Paper, Chromatography, Gas, Chemistry, Chromatography, Paper, Estrone, Pyridines, Microchemistry, Cell Biology, Acetates, Tritium, Combinatorial chemistry, Anhydrides, Bile Acids and Salts, Cellular and Molecular Neuroscience, Fluorocarbon Polymers, Diazomethane, Reagent, Alloys, Molecular Medicine, Indicators and Reagents, Steroids, Testosterone, Molecular Biology
Abstract

Es wird eine einfache mikroanalytische Technik zur Ausfuhrung von Reaktionen mit fluchtigen Reagenzien beschrieben.

Published
1967

7. Studies on adenosine triphosphate citrate lyase of rat liver. Binding site of citrate

Author

F, Suzuki

Subjects
Electrophoresis, Paper, Chemical Phenomena, Chromatography, Paper, Glycine, Lyases, Hydroxamic Acids, Hydroxylamines, Imides, Anhydrides, Methylamines, Adenosine Triphosphate, Glutamates, Animals, Citrates, Amines, Amino Acids, Aspartic Acid, Binding Sites, Aminobutyrates, Dipeptides, Chromatography, Ion Exchange, Rats, Chemistry, Liver, Chromatography, Gel
Published
1971