Alpha-l-arabinofuranosidase from Rhodotorula flava.

An alpha-L-arabinofuranosidase (EC 3.2.1.55) from the culture fluid of Rhodotorula flava IFO 0407 grown on beet arabinan as a carbon source has been highly purified. The purified enzyme has a pH optimum of 2.0. The enzyme is unusually acid stable, retaining 82% of its activity after being maintained for 24 h at pH 1.5 and at 30 degrees C. The apparent Km and Vmax values of the enzyme for phenyl alpha-L-arabinofuranoside were determined to be 9.1 mM and 72.5 mumol per min per mg of protein, respectively.     

Flavans from Zephyranthes flava

A new optically active flavan aglucone, 7-hydroxy-3′,4′-methylenedioxyflavan, and its 7-glucoside have been isolated from the bulbs of Zephyranthes flava, collected at flowering. Additionally, two known flavans, 7,4′-dihydroxy-3′-methoxyflavan and 7-methoxy-2′-hydroxy-4′,5′-methylenedioxyflavan, have been isolated for the first time from this species. The structures of these flavans have been established by comprehensive analyses (UV, IR, ¹H NMR, ¹³C NMR, mass spectrometry, [α]_D) of the compounds and their acetates, and also by chemical correlation.     

Alkaloids of zephyranthes flava

From fresh, mature seeds of Zephyranthes flava, two new 2-oxyphenanthridinium alkaloids, zefbetaine and zeflabetaine along with 15 known free and glucosyloxy alkaloids have been isolated by gradient solvent extraction, chromatography and derivatization. The new compounds have been characterized by comprehensive spectroscopic analyses, chemical transformations and synthesis. Additionally, changes in the major alkaloids during development of the fruits have been analysed and their biological significance appraised.     

山茶属山茶组的细胞地理学研究

本文总结了山茶组植物的细胞学资料,结合形态和地理学特征讨论了该组植物扩散及分化的规律。山茶组具有相同的染色体基数,变化较大的倍性。其中子房无毛的种类除Ｃ．ｃｈｅｋｉａｎｇｏｌｅｏｓａ Ｈｕ,Ｃ．ｊａｐｏｎｉａｃａ Ｌ．的个别居群外都是二倍体;多倍体主要出现在苞,萼,后发脱落,子房被毛的种类中,分布于南岭以西至西南地区,南岭及南岭在东,以南地区未发现多倍体。     

Phosphatidylpyrrolophenanthridine alkaloids from Zephyranthes flava

Four new alkaloidal phospholipids, 2-O-glycerophosphoryllycorine, phosphatidyllycorines, phosphatidylpseudolycorines and phosphatidyllycorinium methocation, were isolated from the flowers of Zephyranthes flava. The structures of these compounds were established by comprehensive spectral analyses, chemical transformations and synthesis, where possible. The biological profile of this novel group of alkaloidal conjugates is appraised.     

山茶属山茶组植物的分类,分化和分布

山茶组Ｓｅｃｔ．Ｃａｍｅｌｉａ植物迄今已合格发表的名称有７２种,１亚种和７变种,其中Ｓｅｃｔ．Ｐａｒａｃａｍｅｌｉａ中的威宁短柱茶Ｃ．ｗｅｉｎｉｎｇｅｎｓｉｓ和Ｓｅｃｔ．Ｃｏｒａｌｉｎａ中的连山离蕊茶Ｃ．ｌｉｅｎｓｈａｎｅｎｓｉｓ应归属本组。经研究订正,确认该组共１２种和６变种,其余名称均作为相应种、变种和变型的同物异名,文中讨论了物种的形态变异与分化,分布与替代,自然杂交等问题。     

Two biflavonoids from Ouratea flava stem bark

In a chemical investigation on the stem bark of Ouratea flava, two biflavonoids: 1-[3-(2,4-dihydroxy-benzoyl)-4,5,6-trihydroxy-2-(4-hydroxy-phenyl)-benzofuran-7-yl] -3-(4-hydroxy-phenyl) -propenone (flavumone A) and 3-(2,4-dihydroxy-benzoyl)-4-hydroxy-2,7-bis-(4-hydroxy-phenyl) -7,8- dihydro-furo[2,3-f]chromen-9-on (flavumone B) were isolated along with five known flavonoids. Their structures were established by various analyses including 2D-NMR spectroscopy.     

1074. Camellia minutiflora Hung T. Chang

Camellia minutiflora Hung T. Chang, described from Hong Kong in 1981 is illustrated. Its cultivation and related species are discussed.     

Camellia luteocerata sp. nov. and a new section of Camellia (Dalatia) from Vietnam

A new Vietnamese species of the genus Camellia L. (Theaceae, Theoidae) is described and illustrated as C. luteocerata Orel. This species occurs in the rainforests of Lam Dong Province, Vietnam. Morphological characteristics that distinguish it from related Camellia species are presented and discussed. Morphological evidence supports a taxonomic placement in a new section, which is described here as Camellia sect. Dalatia Orel, within C. subgen. Protocamellia (sensu Chang).