Abstract: The present invention relates to an injectable complex used for the diagnostic visualization of neoplastic tissues i.e., tumors and metastases, by means of tissue scintigraphy, said injectable complex consisting essentially of .sup.99m Technetium with a dicarboxylic or tricarboxylic acid of the general formula: ##STR1## in which n is 1 or 2, R.sup.1 and R.sup.2 taken together are an oxo group or a >CH--COOH group or R.sup.1 is hydrogen or hydroxyl or an amino group and R.sup.2 is hydrogen or one of the following groups:--CH.sub.2 --COOH; --CHOH--COOH; --CO--COOH,and a water-soluble salt of the same, in a sterile aqueous solution having a physiologically harmless pH value.

Abstract: In a process for the preparation of heterologous arterial transplants comprising freeing young animal arteries of surrounding tissue, ligating collateral branches, subjecting the resulting arteries to proteolysis to remove elastic fibers and muscle tissue to obtain collagen tubes and tanning the latter tubes to effect cross-linking, the improvement comprising effecting the proteoylsis and tanning steps in a continuous flow manner.

Abstract: Aliphatic amine nicotinates (I) and N-oxide nicotinates (II) of the formulae ##STR1## have advantageous therapeutic properties, particularly for dilating blood vessels.

Abstract: N-mono-substituted ureas represented by ##STR1## wherein R is hydrogen, hydroxyl, or thiol, R.sub.1 is hydrogen, methyl or ethyl and n is 1, 2, 3 or 4, have therapeutic properties.

Abstract: Novel blood extracts of vertebrata, i.e. animals having a vertebral column, especially warm blooded animals, which blood extracts possess cell respiration stimulating activity and stimulate the growth of cells and to novel processes for the preparation of the said blood extracts.

Abstract: Process for preparing injectable technetium-99m or indium-113m preparation of high specific activity by contacting an aqueous solution of such radionuclide of low specific activity with a metal hydroxide precipitate, separating the precipitate with the radionuclide concentrated therein and dissolving the precipitate in an aqueous solution of a chelating agent.

Abstract: Compositions derived from spleens of vertebrata and process for obtaining the said compositions which are useful for increasing or decreasing the normal rate of tissue growth.