Showing papers by "The Chinese University of Hong Kong published in 1969"

Factors Affecting Spore Germination of Volvariella volvacea

Abstract: Environmental factors affecting basidiospore germination were studied with Volvariella volvacea, the edible straw mushroom which is common in South East Asia. A relatively mild heal shock is necessary for spore germination. The spores give best germination at 40°C although early hyphal growth is better at 35°C the germination of spores is affected by temperature. pH. a presoaking treatment and spore density. Higher pH supports more germination but seems unfavourable for early mycelial growth. Presoaking treatment in phosphate buffer solution or distilled water also stimulates germination markedly.

Riemann surfaces of field extensions

Abstract: Since Riemann's dissertation of 1851, Riemann surfaces have for the most part been considered as suitable domains of definition for analytic functions. Here, however, we view them as topological spaces associated with certain kinds of field extension, and consider how their topological properties are connected with algebraic properties of these field extensions. A specialization of these results gives us arithmetic properties of fields of algebraic functions of one real variable.

Nuclear Behaviour in the Basidium of Volvariella volvacea

Abstract: Modified cytological techniques were used in this study of the nuclear phenomenon in the basidium of V. volvacea. The number of nuclei in the cells of vegetative mycelia varried from 2-36. The short cells of subhymonium layer had a reduced number of 2-4. The two haploid nuclei were found both in the supporting cells and in the young basidia. Conventional meiotic figures were observed. There were nine bivalent chromosomes at early metaphase aligning themselves in a semi-circle at the upper part of basidium. Resting compact nuclei were at intervals of karyogamy and first meiotic divisions. Neither spindle nor centrioles were observed with this preparation. Migration of the four postkaryotic nuclei into the spores is by slipping of nuclear material through the narrow sterigma. Preliminary suggestion directs to the point that this fungus is homothallic. The sexual mechanism and the alignment of second meiotic spindle in relation to its incompatibility factors is still poorly understood.

A note on simplex spaces

Abstract: Let X be a real Banach space which is partially ordered by a closed cone C . Let X * denote the Banach dual space, and let X is called a simplex space ( 2 ) if ( X *, C *,‖·‖) is an AL -space. We proved in (3) that X is a simplex space if and only if X is an approximate order-unit-normed space and has the Riesz decomposition property. When the given norm on X is an order-unit norm, some representation theorems are obtained by Effros (( 2 ), theorem 4·8) and Sterrmer (( 6 ), theorem 4·3). In this note, we shall study the representation problem for more general simplex spaces. One of our aims is to prove that X is equivalent to C 0 (ω) if and only if X has the Urysohn property (for definitions, see below).

Multi-channel dynamics for the Y 1 * (1660) resonant state

Abstract: The channels BP, Y0*(1405)P and BV are included in a dispersion calculation, in a simplified pole approximation, for the 3/2− baryon resonances. The Y1*(1660) is found to be consistent with the γ-octet assignment with a calculated total width of 46 MeV.