Theileria gilberti n. sp. (Apicomplexa: Theileriidae) in the Gilbert's Potoroo (Potorous gilbertii)

ABSTRACT. The morphology and genetic characterisation of a new species of piroplasm identified in the blood of the Gilbert's potoroo ( Potorous gilbertii ) from the Two Peoples Bay Nature Reserve near Albany, Western Australia, is described from blood and tissue samples from 16 Gilbert's potoroos. Microscopy of blood showed these parasites are highly pleomorphic with a mean length of 1.8 μm and mean width of 0.85 μm. Phylogenetic analysis of 18S rRNA sequence data identified the piroplasm as a new species of Theileria that is closely related to other Australian marsupial piroplasm species. Based on biological and molecular data, it is proposed that the parasite from Gilbert's potoroo be given the name Theileria gilberti n. sp.     

中国蝶类新种小志Ⅳ

本文记述国产眼蝶科(Satyridae)的一个新属Sinonympha与它的一个模式种Sinonympha amoena(新种),这一蝶类最早是笔者于1939年7月在我国四川省西北部的杂谷脑(理县)发见的。为欲较全面地了解它们在分类系统上的亲缘关系,又于1963年和1964年在原产地采集了大量的成虫标本,并于1965—1966年在北京饲养了它的幼期。 新华新眼蝶属Sinonympha新属 新属属征 新华新眼蝶属Sinonympha(新属)与Coenonympha Hbner(1819)较为近似,但是某些形态特征和生物学特性(包括幼期)则与Ypthima Hbner(1818),OeneisHbner(1819)以及Mycalesis Hbner(1818)等属的种类互有相似之处,现将本新属的主要特征列述于下:     

人精液凝固蛋白SgI-52的表达与抗菌活性研究

以人精囊腺cDNA为模板,用嵌套式PCR技术扩增出编码成熟人精液凝固蛋白I(semenogelin I,SgI)第85–136位氨基酸(SgI-52)的核苷酸序列并将其插入载体pMAL-p2X中,成功构建的表达载体pMAL-p2X/SgI-52转化大肠杆菌DH5α后,重组融合蛋白诱导表达于大肠杆菌周质中。经第X因子剪切及超滤处理,得到表达的重组SgI-52。质谱分析结果证明重组SgI-52为目的肽。重组人SgI-52对大肠杆菌ATCC25922标准株以及耐氨苄标准株ML-35P的最低抑制浓度MIC分别为32.45以及46.30?μg/mL。我们的结果及相关研究提示在人精液液化过程中人精液凝固蛋白I的不同降解产物可能行使不同的生物学功能,值得进行深入研究。     

Molecular Identification of Algal Endosymbionts in Large Miliolid Foraminifera: 2. Dinoflagellates

Large miliolid foraminifers of the subfamily Soritinae bear symbiotic dinoflagellates morphologically similar to the species of the "Symbiodinium" complex, commonly found in corals and other marine invertebrates. Soritid foraminifers are abundant in coral reefs and it has been proposed that they share their symbionts with other dinoflagellate-bearing reef dwellers. In order to test this hypothesis, we have analysed partial large subunit ribosomal DNA sequences from dinoflagellates symbionts obtained from 28 foraminiferal specimens, and compared them to the corresponding sequences of Symbiodinium-like endosymbionts from various groups of invertebrates. Phylogenetic analysis of our data shows that all soritid symbionts belong to the "Symbiodinium" species complex, within which they form seven different molecular types (Frl-Fr7). Only one of these types (Fr1) branches within a group of invertebrate symbionts, previously described as type C. The remaining six types form sister groups to coral symbionts previously designed as types B, C, and D. Our data indicate a high genetic diversity and specificity of Symbiodinium-like symbionts in soritids. Except for type C, we have found no evidence for the transmission of symbionts between foraminifers and other symbiont-bearing invertebrates from the same localities. However, exchanges must have occurred frequently between the different species of Soritinae, as suggested by the lack of host specificity and some biogeographical patterns observed in symbiont distribution. Our data suggest that members of the subfamily Soritinae acquired their symbionts at least three times during their history, each acquisition being followed by a rapid diversification and independent radiation of symbionts within the foraminiferal hosts.     

A multivariate approach to the selection of biological reserves

Multivariate analysis provides an effective context for the examination of some significant aspects of biodiversity and conservation. The framework is a multidimensional space that integrates sample sites, taxa and environments. This approach enables terms such as representativeness, complementarity and irreplaceability to be integrated within an intuitive and practical framework for reserve design. Cluster analysis is proposed to determine what is there by defining a set of complementary clusters. These clusters are sampled in a representative manner; from the core outward. The degree of irreplaceability of a site is defined as the multivariate distance of each potential reserve site to its nearest neighbour.     

在韩国危害红松球果的三种蛾类幼虫形态记述（鳞翅目）

详细地记述了韩国红松球果害虫冷杉梢斑螟Dioryctria abietella、赤松梢斑螟D. sylvestrella (螟蛾科)和小花尺蛾Eupithecia abietaria debrunneata (尺蛾科)幼虫的形态特征,并提供了形态特征图。     

The effect of increased deposition of atmospheric nitrogen on Calluna vulgaris in upland Britain

Regular (monthly) additions of NH₄NO₃ (4–12 g N m⁻² yr⁻¹) were made over a period of 8 yr (1989–98) to areas of moorland in North Wales dominated by the ericaceous shrub Calluna vulgaris . Results from the early stages of the experiment (1990–94) have shown marked and dose-related increases in shoot extension and canopy height in response to the nitrogen treatments, with significantly higher shoot nitrogen contents. The nitrogen-related stimulation in the growth of the C. vulgaris canopy over this period has resulted in large accumulations of litter on the high-nitrogen-treated plots (6.6 kg m⁻² in plots treated with 12 g N m⁻² yr⁻¹, compared with 3.8 kg m⁻² for the water controls). Litter nitrogen concentrations were also significantly increased at the higher rates of nitrogen addition, leading to a doubling of the total return of nitrogen to the litter layer over the experimental period. These changes in vegetation structure were associated with large reductions in the abundance of the bryophyte and lichen species normally present under the untreated canopy. Results since 1994, however, show little increase in shoot extension in response to the nitrogen treatments, with no clear dose response to increasing levels of addition. These findings are associated with a dose-related increase in the susceptibility of the nitrogen-treated areas of the C. vulgaris canopy to late winter injury, characterized as browning of the shoot tips in early to late spring. These results indicate that deleterious effects are now accumulating as a result of the long-term addition of nitrogen to these moorland plots.     

口服卡介菌苗後结核菌素试验的陽转率

自1951年9月至1952年6月间,在北京有1,630名新生婴儿口服卡介菌苗,其中有1,063名在口服後举行结素试验,口服150毫克菌苗的164人中,在第十週结素陽转率为73．17％,第十四週時为94.96％。口服30毫克菌苗的899人中,在第十四週時结素陽转率为71.19％,其中僅0.77％有頸部淋巴腺腫大。说明口服卡介菌苗,使用简单,不须特殊技术,且引起併发症极微,可以广泛採用,尤其是推广到农村去,更为適合。     

Subcellular Distribution of Inorganic Phosphate, and Levels of Nucleoside Triphosphate, in Mature Maize Roots at Low External Phosphate Concentrations: Measurements with 31P-NMR

Maize plants were grown in nutrient solution without phosphate,or in which inorganic phosphate (Pi) was maintained at nearlyconstant concentrations of 1 µM, 10µM or 0·5mM. In vivo ³¹P-NMR measurements showed that there was no discernibledifference in the cytoplasmic Pi content (µmol cm^–3root volume) of the mature roots of plants exposed to 1 µM,10µM or 0·5 mM external phosphate for up to 12d. However, the vacuolar Pi content of the mature roots variedabout 10-fold between these three groups. The cytoplasmic Pi content of roots receiving no external phosphatedecreased significantly after about 7 d total growth, and atabout this time the vacuolar pool of Pi became too small foraccurate measurement. The presence of 1 µM Pi in the nutrientsolution completely prevented this decline in cytoplasmic Pi,and there was some evidence that it also raised the Pi contentof the root vacuoles above the almost undetectable level foundin the totally P-starved roots. During the first 7–9 d of growth, the nucleoside triphosphatecontent of the mature roots was unaffected by the concentrationof phosphate in the nutrient solution. The results highlight the close control of cytoplasmic concentrationsof certain important phosphorus metabolites in roots growingin soil of normal agricultural fertility. Key words: Vacuole, cytoplasm, intracellular compartmentation, NTP, P-nutrition