A new genus of apterous scelionid from Lord Howe Island (Hymenoptera; Scelionidae)

Abstract. Psyllobaeus pecki gen. and sp.n., is described from Lord Howe Island, Australia. This genus is unique in the Baeini in that both sexes (not just the female) are apterous, have a sessile metasoma and have a pair of long spines on the apex of the hind femur. The relationships of Psyllobaeus and its biology are discussed.     

The effect of impoundment on the water chemistry of Lake Asejire, Nigeria

SUMMARY. Following the impoundment of the River Oshun to form Lake Asejire, Nigeria, in 1970, changes in the water chemistry were monitored. Chemical stratifications followed closely the pattern of thermal stratifications as the lake was chemically stratified from February to April and destratified from June to September and in January.     

浙江省SARS冠状病毒分离与系统进化树分析

从浙江省3例SARS患者中收集含漱液标本,经处理后接种Vero、RD、VeroE6和Hep-2细胞进行病毒分离,培养3d后在Vero和RD细胞中可观察到细胞病变.从细胞培养上清中提取病毒核酸,用SARS冠状病毒特异性引物进行RT-PCR,并经测序证实从3份临床样本中分离到2株SARS冠状病毒株.对其中1株病毒的基因组进行了全序列测定并作系统进化树分析显示浙江省SARS冠状病毒株与新加坡2774株和台湾TW1株最为接近.     

Book Reviews

Book reviewed in this article:
ARCHEOLOGY: The Emergence of Plateun Culture . EARL. H. SWANSON, Jr.
ARCHEOLOGY: The First Conference of Western Archaeologists On Problems of Point Typology . EARL H. SWANSON, Jr.
ARCHEOLOGY: An Archaeological Survey of Northern Puget Sound . ALAN LYLE BRYN.
ARCHEOLOGY: Reconnaissance and the Archaeological Survay System of the University Museum . EARL H. SWANSON, Jr.
ARCHEOLOGY: Birch Creek Papers No. 1: An Arhaeological Reconnaissance in the Birch Creek Valley of Eustern Idaho . EARL H. SWANSON, Jr. and ALAN LYLE BRYAN.
ARCHEOLOGY: Birch Greek Papers No. 2: Nutural and Cultural Straligraphy in the Birch Creek Valley of Eastern Idaho . EARL H. SWANSON, Jr., B. ROBERT BWLER, and ROBSON BONNICHSEN.
ARCHEOLOGY: Contributions to the Prehistory of Vancouver Island. KATHERINE H. CAPES.     

Revision of the genus Buluka de Saeger (Hymenoptera: Braconidae: Microgastrinae)

Abstract Buluka , a genus previously only known from two species, B.straeleni de Saeger from central and southern Africa and B.orientalis Chou from Taiwan, is revised. A further five new species are described: B.noyesi (central India), B.townesi, B.achterbergi (peninsular Malaysia), B. huddlestoni (Solomon Is.) and B. taiwanensis (Taiwan). New characters of generic importance, a key to species and the first host record are presented. The relationship between Buluka and other microgastrine genera are discussed.     

乳腺增生组织蛋白质组的凝胶内差异显示电泳分析 `

目的：建立具有高分辨率和稳定性的乳腺增生组织蛋白质组的双向电泳图谱,并对其进行差异蛋白质组分析。方法：取乳腺增生病患者增生部位及正常部位乳腺组织,匀浆提取乳腺组织总蛋白,分别用Cy3或Cy5标记,每一对Cy3和Cy5标记样品都与一个Cy2标记的内标等量混合,上样于同一胶中进行电泳分离,经不同光激发下扫描得到不同样品的蛋白质组图谱。所获得的图谱经DeCyder软件进行分析。结果：在乳腺增生病增生的组织中,有12个蛋白质表达水平显著增加,另外3个蛋白质表达水平显著下降。结论：利用DIGE技术可以作胶内时比分析,也可以根据内标消除胶与胶之间的差异,提高统计的可信度;分析所得的15个差异蛋白质可能与乳腺增生疾病的发生与发展有关。     

Nitrogen addition stimulates forest litter decomposition and disrupts species interactions in Patagonia,Argentina

Nitrogen (N) deposition and biodiversity loss are important drivers of global change, with uncertain consequences for carbon (C) and nutrient turnover in terrestrial ecosystems. We evaluated the simultaneous effects of N deposition and plant diversity on litter decomposition within a temperate forest in Patagonia. We identified ‘tree triangles’ created by the intersection of three tree‐canopies that directly controlled micro‐environmental conditions on the forest floor, and combined it with an N addition treatment. Triangles were composed of one or three Nothofagus species (N. dombeyi, N. obliqua or N. nervosa). We placed litterbags containing litter of each of the Nothofagus species and litterbags containing a mixture of the three species within all triangles and assessed mass loss over 2 years. We used a standard litter type in all triangles to independently evaluate triangle effects on decomposition. N addition had strong and positive effects on decomposition with an average 46% increase in the decomposition constant. Litter species significantly differed in their response to N addition; litter with higher lignin content and lower labile C content had larger increase in decomposition due to fertilization. Also, N addition disrupted two types of species interactions that control decomposition. The affinity relation between litter and decomposers, that enhanced decomposition of home litter (‘home‐field advantage’) that was demonstrated to be significant for all three Nothofagus species, disappeared with N addition. Second, N addition modified litter species interactions, transforming neutral effects of litter mixtures to positive, nonadditive effects on mass loss. Finally, N addition stimulated N release from decomposing litter which was modulated by plant species effects. Together, these results suggest that N addition to unpolluted forests increases C loss, contrary to what has been observed for temperate forests in industrialized areas of the world, and that alterations in nutrient pools have effects on species interactions, including the elimination of affinity effects for decomposition.