Effects of ammonium and aluminium on the development and nutrition of Pinus nigra in hydroculture.

Application of ammonium and aluminium to young Pinus nigra var. maritima (Ait.) Melville trees resulted in a variety of negative effects.

Differences in innervation and secretory behaviour of two nasal glandular parts in the rat.

The submucosal glands in the rat nose are characterized by the presence of both neutral and acid glycoproteins, which are important constituents of nasal and tracheobronchial secretions. This study is an attempt to gain a better insight into the secretion of these two types of glycoproteins and its neural regulation. Radiobiochemical experiments show a higher sensitivity to methacholine of the nasal glandular region producing acid glycoproteins than the area secreting neutral glycoproteins.

Three-dimensional structure of thaumatin I, an intensely sweet protein.

Thaumatin and monellin are the two sweetest compounds known to man--about 100,000 times sweeter than sugar on a molar basis and 3000 times on a weight basis. These proteins represent a unique class of proteins that are taste-active. We report the three-dimensional structure of thaumatin I at 3.