Studies on the Chemical Constituents of Rourea microphylla (Hook. et Arn) Planch.

Eleven compounds were isolated from the twigs and leaves of Rourea microphylla (Hook. et Arn) Planch. They were identified as quercetin-3-O-α-L-rhamnopyranoside (Ⅰ), hyperin (Ⅱ), quercetin (Ⅲ), astilbin (Ⅳ), β-sitosterol (Ⅴ), β-sitosteryl-β-D-glucopyranoside (Ⅵ), physcion (Ⅶ), erythroglaucin (Ⅷ), stearic acid (Ⅸ), palmitic acid (Ⅹ) and n-nonacosanane (Ⅺ) respectively, by means of UV, IR, NMR, MS spectra analyses and through chemical methods. The compounds Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅵ, Ⅶ, Ⅷ, Ⅸ, Ⅹ and Ⅺ were first reportedin the Rourea genus.     

A New species of the Genus Tupistra (Convallariaceae), with Reference to Its Karyotype and Pollen Morphology

A species of the genus Tupistra,T．pingbianensis J．L．Huang et X．Z．Liu,is described as new,and its karyotype and pollen morphology are reported． The bimodal karyotype of this species is formulated as 2n＝38＝14m+10sm+8st+6t,and pollen grains are spheroidal,inaperturate,with rugulate exine sculpture．Based on its floral structure,karyotype and pollen morphology,T．pingbianensis J．L．Huang et X．Z．Liu is considered phylogenetically closely related to T．fungilliformis Wang et Liang．Whether the repense rhizome,solitary leaves of T．pingbianensis J．L．Huang et X．Z．Liu indicate a close relationship between the genus Tupistra and the genus Aspidistra needs further studies．     

库恩菇属一新组合种(国内新记录)

本文报导了A.H.Smith和L.R.Hesler1968年命名的Pholiota conica A.H.Smith et L.R.Hesler在我国的新记录, 并根据R.Singer1975年的分类系统进行了新组合Kuehneromyces conicus(A.H.Smith et L.R.Hesler)J.B.Wang et Z.B.Chen comb.nov.     

Studies on Diterpenoids ot Rabdosia macrocalyx var. jiuhua Z. W. Xue et X. W. Wang

Four diterpenoids have been isolated from the dried leaves of Rabdosia macrocalyx var. juihua Z. W. Xue et X..W. Wang. Three of them were shown to be known diter- penoids, excisanin A, excisanin B and macrocalyxin A, while the one, a new kauranetype diterpene, was named jiuhuanin A. On the basis of physico-chemical constants, spectroscopic analysis of the new compound and properties of its derivatives, the structure of the compound was identified as (1). Jiuhuanin A was shown to have cytotoxicity in vitro against cultures of Hela cell and A549 cells.     

Chemical Structures of Reniformin A,B, and C

Three new cytotoxic diterpenoids reniformin A, B and C, have been isolated from the leaves of Rabdosia latifolia var. reniformis Z. W. Xue et X. W. Wang. Their structures were established as (1), (2), and (3) by spectroscopic and chemical data respectively.     

The Isolation and Characterization of Triterpenoid Constituents from Maytenus confertiflora Lou et Chen

A new triterpenoid confertiflorol along with other two triterpenoids(canophyllol and wieforlide A) have been isolated from the stems of Maytenus conferti-flora Luo et Chen (Celastraceae). The chemical structure of confertifiorol, as 28, 29-dihydroxyfriedelan-3-one, has been confirmed on the basis of chemical studies and spectrometric analysis.     

水稻品种和稻虱缨小蜂对褐飞虱协同作用的模拟分析

利用我们先前的试验结果和文献资料,组建了水稻品种－褐飞虱－稻虱缨小蜂３者相互关系的模拟模型．模拟分析表明水稻品种能直接和间接地通过物理或化学特性影响稻虱缨小蜂的寄生作用,其中以影响褐飞虱卵垂直分布型、稻虱缨小蜂的迁入时间、未成熟期历期和怀印量等的水稻品种特性起主要作用．同时,模拟分析还表明中等抗性的水稻品种,配以增强稻虱缨小蜂寄生作用的品种特性,就能有效地控制褐飞虱的危害．文中还就协调水稻品种抗性与天敌协同控制褐飞虱的途径进行了讨论．     

The oldest ‘amphipterygid’ damselfly of tropical affinities in the Paleocene of Menat (Zygoptera: Eucaloptera)

The new damselfly genus and species Valerea multicellulata is described from the Paleocene of Menat (France), a Lagerstatte with many fossil insects, plants and vertebrates with high paleontological value. Aquatic insects are very scarce in this outcrop, this damselfly being the fourth described Odonata. Its closest modern relatives belong to the Amphipterygidae or the Devadattidae, families with very narrow tropical extant distributions. This new fossil allows us to confirm the tropical affinities of the odonatan fauna of the Menat paleolake communities. It also shows that the amphipterygids were clearly more widespread during the Paleogene than today, probably in relation to the worldwide warm and equable climate in the Paleocene.

http://zoobank.org/urn:lsid:zoobank.org:act:3F631097-DE0B-40FA8227-9C12F55DBAB4     

A small, “wader-like” bird from the Early Eocene of Messel (Germany)

A small bird with a shorebird-like beak and a very long hind toe is described from the Early Eocene of Messel in Germany. Vanolimicola longihallucis, gen. et sp. nov. is one of the few candidate species for a “wading bird” from Messel, that is, a bird that may have foraged along the shoreline of the ancient lake. A few features indicate a relationship to charadriiform birds and Jacanidae (jacanas) in particular, but charadriiform affinities are only weakly supported. In the preserved skeletal elements, V. longihallucis also resembles the taxon Songzia from the Early Eocene of China, which is considered to be a representative of the Ralloidea (rails and allies). A potential biogeographic significance of the new Messel fossil is strengthened by similar fossils from the North American Green River Formation.