Intermedium Research Articles

Cell junctions of the human enamel organ

The nature and distribution of cell contacts have been examined in the human enamel organ in bell stage. The lateral cell surfaces of secretory ameloblasts are linked at their distal (apical) and proximal (basal) parts by junctional complexes consisting of tight junctions, large intermediate junctions (zonulae adherentes), occasional gap junctions and one or more series of desmosomes. Scattered desmosomes and large gap junctions link epithelial cells of the external enamel epithelium, stellate reticulum, stratum intermedium and internal enamel epithelium including secretory ameloblasts. Furthermore the above-mentioned layers are also linked together by desmosomes and gap junctions.

Insect Moulting Hormones: Dacrysterone, a New Phytoecdysone From Dacrydium intermedium

Dacrysterone, a new phytoecdysone, has been isolated from the bark of Dacrydium intermedium and shown to be 5β-hydroxymakisterone A (6). Makisterone A also occurs in this plant.

The pathogenicity of several Pythium species to rootlets of apple seedlings

From diseased apple rootletsPythium sylvaticum was isolated. Pathogenicity tests have shown thatP. sylvaticum, P. ultimum andP. intermedium are strongly pathogenic to the primary root of the apple seedling. Uit wortels van appelbomen in een perceel waar het verschijnsel bodemmoeheid optreedt, werd de schimmelPythium sylvaticum geisoleerd. Deze schimmel en ookPythium ultimum enPythium intermedium bleken pathogeen te zijn voor de primaire wortel van de appelzaailing.

ARTIFICIAL AND NATURAL HYBRIDS IN THE GRAMINEAE, TRIBE HORDEAE. VI. CHROMOSOME PAIRING IN SECALE CEREALE x AGROPYRON INTERMEDIUM AND THE PROBLEM OF GENOME HOMOLOGIES IN THE TRITICINAE

ARTIFICIAL AND NATURAL HYBRIDS IN THE GRAMINEAE, TRIBE HORDEAE. VI. CHROMOSOME PAIRING IN SECALE CEREALE x AGROPYRON INTERMEDIUM AND THE PROBLEM OF GENOME HOMOLOGIES IN THE TRITICINAE