The biosynthesis, localization and fate of catecholamines in the ink gland of the cuttlefish Sepia officinalis were investigated by combined biochemical and immunohistocytochemical methodologies. HPLC analysis of crude ink gland extracts indicated the presence of dopa (2.18+/-0.82 nmol/mg of protein) and DA (dopamine, 0.06+/-0.02 nmol/mg of protein), but no detectable noradrenaline or adrenalin...

The technology of the used machines and tools in printing technology and in the offset printing has reached the stage when, technologically, it is very difficult to raise the printing quality with the up to now used production materials, which the world market demands more and more [1, 2]. Because of that the producers of the printing materials and inks invest great means in the development of ...

Sea hares of the genus Aplysia rely on an array of behavioral and chemical defenses, including the release of ink and opaline, to protect themselves from predation. While many studies have demonstrated that ink and opaline are repellent to predators, very little is known about which components of these secretions are active against predators. Ink was previously shown to facilitate the escape of...

One of the most distinctive and defining features of coleoid cephalopods-squid, cuttlefish and octopus-is their inking behavior. Their ink, which is blackened by melanin, but also contains other constituents, has been used by humans in various ways for millennia. This review summarizes our current knowledge of cephalopod ink. Topics include: (1) the production of ink, including the functional o...

ink Math Expressions Pattern Matching Math Expression Candidates Selector Math expressions patterns DB MathML(C+P) ink + reco

Modelling freehand writing in all its capacitive expressiveness and stylised apotheosis is highlighted in this paper. We derive the necessary requirements for freehand writing representation from observations made in e-learning scenarios where the representation of ink data describing the dynamics of freehand writings as natural parameters is useful. We show that random real-time access for rec...

This paper discusses various aspects of two ink aging methods that analyze ink volatile components, Sequential Extraction Technique (SET) and Solvent Loss Ratio Method (SLRM). Multiple ballpoint ink writings of various ages were tested by the SET and SLRM both before and after the pages bearing the writings were examined for indented writing impressions using an electrostatic detection apparatu...