A dead-burned refractory magnesia composition suitable for use in the manufacture of high hot strength magnesia refractories comprises at least 95% by weight MgO, less than 0.4% by weight of silica, an amount of lime greater than (2S + 0.3)% by weight, where S is the percentage by weight of silica, the weight ratio of lime to silica in the composition being greater than 3:1, and boron in an amount of less than 0.25% by weight expressed as B.sub.2 O.sub.3.

The new compound known as cytochalasin E and a process for its manufacture by cultivation of the organism Rosellinia Necatrix. The compound produces effects on tissue culture cells and is useful in the study of cytological processes.

Partially depolymerized heparin products having particular analyzable reducing end groups, a process for their preparation and their use as anticoagulants and antithrombotics.

Partially depolymerized heparin products having particular analyzable reducing end groups, a process for their preparation and their use as anticoagulants and antithrombotics.

A green fluorescent substance of the invention is higher in luminance of green than a conventional rare-earth activated sialon fluorescent substance and more excellent in durability than a conventional oxide fluorescent substance. The fluorescent substance is obtained by solid-dissolving Eu into a nitride or oxy-nitride crystal having a .beta.-type Si.sub.3N.sub.4 crystal structure, and emits a fluorescent light having a peak within a range of 500 nm to 600 nm in wavelength by being irradiated w...

A highly active bioactivating substance which exhibits suppressing action on histamine liberation and inhibition of hyaluronidase activity may be obtained by adding a silicate to an extracted substance from tissues activated by adding internal or external stressors to animals or animal tissues such as infecting with poxvirus. The highly active bioactivating substance may also be obtained by performing a special extraction to effect a high content of silicic acid in the extracted substance from t...

The present invention generally relates to a fluidizer including at least one wall forming a conduit for a gas. The at least one wall may include a material having microscopic holes therein with a sufficient porosity to permit the escape of the gas through the microscopic holes to gas a substance. The present invention may also relate to a fluidizer including a non-cylindrical shape for fluidizing a particulate substance. The fluidizer can include a body at least partially positioned within a fl...

A new substance having antitumor activity is obtained from an epidermal portion of rice. A substance called RBF-P is obtained by adding ethanol to an aqueous alkaline extract of rice bran, removing the insolubles and precipitating the substance by addition of an acid. This substance comprises an active substance called RBF-PM, which is insoluble in methanol, and an active substance called RBF-X, which is soluble in acetone. The substance RBF-PM is a protein containing extremely little cystine an...

A one-component dispersion comprising deactivated isocyanates which cross-links already at low temperatures (lower than 70.degree. C.).

The present invention relates to a nanostructural substance constituted from primary particles having a particle diameter of not more than 30 nm. In the nanostructural substance of the present invention, the primary particles have a small particle diameter, and a contact surface between the primary particles is small. In particular, since the nanostructural substance of the present invention has a large content of molecules existing at the surface thereof and, therefore, a high surface energy as...