Urea–formaldehyde resins are the most important type of the so-called amino plastic resins. Amino resins are often used to modify properties of other materials. These resins are added during the processing of
, Acta Chem . Scand . 20 ( 1966 ) 1504 – 1507 .  E . Tyihák , Magyar Kémikusok Lapja 27 ( 1972 ) 547 – 556 .  E . Tyihák , G . Gullner , and L . Trezl , Formaldehyde Cycle and Possibility of Formation of Singlet Oxygen in Plant
Development of an Innovative Gas Chromatography—Mass Spectrometry Method for Assessment of Formaldehyde in the Workplace Atmosphere
S. Dugheri et al.
Formaldehyde (FA), a colorless gaseous
A group of thirteen newly synthesized potential herbicides,
-aryltrichloroacetamides or 2-(chlorophenoxy)acyl derivatives, have been initially investigated by reversed phase (RP) TLC. The lipophilicity of the substances was described by retention factors in water, log
, calculated from experimental RP TLC data, and by log
values calculated by use of software. Biological activity was examined by use of the BioArena system of TLC separation then (micro)biological detection. The potential role of formaldehyde (HCHO) in the toxic antibacterial action of substances against
bacterial cells was investigated. The effect of HCHO capturers (L
-arginine and reduced glutathione) and Cu
ions on the bioactivity and mechanism of toxicity of the substances was examined. It was established that HCHO and its potential reaction products (e.g.
) are crucial in the mechanism of action of these molecules. Correlations between the lipophilicity and bioactivity of the test compounds were also analyzed. It seems that hydrophobicity is not the decisive factor affecting the bioactivity of these substances.
The most current in vitro and in vivo results in the BioArena system and under greenhouse conditions provide a good opportunity for a fundamental renewal of biological detections and interactions in layer liquid chromatography. The adsorbent bed in a column liquid arrangement is not suitable for biological detection because the living cells do not grow there. Contrarily, the planar adsorbent layer enables the in situ biodetection of antimicrobials and the interactions among separated compounds, cells, and further various cofactors (molecules), making the study of mechanisms of action possible. The basic elements of the time- and dose-dependent quadruple immune response of plants to pathogens in relation to the function and reactions of formaldehyde and its reaction products (mainly endogenous ozone) were demonstrated. This finding opens a new horizon in the field of disease resistance in plants and perhaps in general in the biological world. These results give a good basis and possibility for studying and understanding the unique high-dilution phenomena as well, and at that time, they promise the elimination of century contradictions in this field.
The manufacturing process of phenol–formaldehyde (PF) resins has remained unchanged for several decades. However, numerous efforts have been carried out to reduce the dependence of this industry on phenol, the cost
Melamine–formaldehyde (MF) and melamine–urea–formaldehyde (MUF) resins are some of the most widely used adhesives for exterior and semi-exterior wood panels and for the preparation and bonding of low- and high