3d morphology and gene expression in the drosophila blastoderm at cellular resolution

A polymerizable composition suitable for moulding under heat and/or pressure comprises a polyvinyl halide, e.g. chloride, bromide or iodide or a copolymer of a vinyl halide with vinyl acetate, propionate or butyrate, plasticized with a mixture of (1) an unsaturated alkyd resin made from an alpha-unsaturated alpha-beta polycarboxylic acid and a polyhydric alcohol, e.g. diethylene glycol maleate resin; (2) an allyl or substituted allyl polyester of an aromatic polycarboxylic acid copolymerizable with the alkyd resin, e.g. diallyl phthalate; (3) a non-polymerizable plasticizer for the vinyl halide resin and optionally a polymerization catalyst. The alkyd resin may be made from acids such as maleic, monohalomaleic, fumaric, monohalofumaric, citraconic, mesaconic, acetylene dicarboxylic, aconitic, and itaconic acid, and alcohols such as ethylene glycol, di-, tri- and tetra-ethylene glycols, propylene glycol, trimethylene glycol, thiodiglycol, glycerine, and pentaerythritol. The polyester may be made from allyl, methallyl, 2-chlorallyl or 2-phenyl allyl alcohols and an acid such as tetrachlorophthalic, 4-chlorophthalic, phthalic, benzoyl phthalic, terephthalic, isophthalic, benzophenone-2,4 dicarboxylic or naphthalic acids. Specified plasticizers are tricresyl phosphate, dibutyl sebacate, dibenzyl sebacate, dioctyl phthalate, dibutyl phthalate, dioctyl sebacate and isophorone. Catalysts mentioned are benzoyl, acetyl, lauryl, stearyl, barium, and sodium peroxides, ozone, ozonides, perborates, persulphates, perchlorates, t-butyl perbenzoate and ditertiary butyl perphthalate. The compositions may include fillers, pigments, dyes, opacifiers, mould lubricants and colour stabilizers and may be made into sheets and used in insulated electrical conductors and cables.