花耳科二新种

本文报道了产于中国的花耳科Dacrymycetaceae二个新种,即莽山胶角菌Calocera mangshanensis Liu et Fan和云南花耳Dacrymyces yunnanensis Liu et Fan。     

黑腹菌属二新种

本文报道了中国产的黑腹菌属Melanogaster(黑腹菌科 Melanogastraceae,黑腹菌目 Melanogastrales,担子菌亚门Basidiomycotina)二新种:山西黑腹菌Melanogaster shanxicnsis Liu,K.Tao et Chang和倒卵孢黑腹菌M.obouatisporus Liu,K.Tao et Chang并对中国已报道过的黑腹菌属内的种进行了讨论。     

Biomass and production of phyto- and bacterio-plankton in eutrophic Lake Tystrup, Denmark

SUMMARY.

• 1 Phytoplankton primary production and biomass were compared with bacterial secondary production estimated by means of frequency of dividing cells (FDC) in eutrophic Lake Tystrup. Denmark.
• 2 In the upper part of the photic zone, bacterial secondary production constituted 12% of the carbon fixed by the phytoplankton. In vertical profiles, bacterial secondary production ranged from 7.6% (early spring) to 121% (during August) of the carbon fixed by the algae.
• 3 A close relationship was found between occurrence and activity of bacteria and algae, suggesting that released organic products are of primary importance to the bacteria.
• 4 The annual phytoplankton primary production was estimated as 227 g C m^-2 compared to 102 g C m^-2 assimilated by the bacteria, so 45% of the carbon fixed by the phytoplankton went through pelagic bacteria.

     

十二指肠内胆盐对胃肌电和运动的影响及其神经机制探讨

本文观察了牛磺胆酸钠(ST)灌入小鼠十二指肠后胃肌电快波、慢波和胃收缩波的变化,并对其神经机制作了探讨。用胃壁双电极和胃内水囊-压力换能器法将胃电和胃运动信号输至放大器,然后由记录仪及电子计算机对该信号进行记录、采集、贮存和处理。以5min为单位,计算出灌注 ST 前、后胃电快波、慢波和收缩波频率与总幅度变化的百分数。结果为:十二指肠灌注 ST(n=10)后,胃电快波频率、幅度和收缩波幅度明显抑制。腹腔神经丛麻醉,利血平化和碳酰胆碱可消除 ST 引起的抑制效应。酚妥拉明不能去除该抑制效应,心得安可部分消除 ST 的抑制效应。上述结果表明,十二指肠灌注 ST 对胃电快波和胃运动有抑制效应,并提示该抑制效应的神经传出途径可能为交感肾上腺素能纤维,由β受体介导。     

假芝属一新种

文报道了1988年5月采自香港的假芝属 Amauroderma 的一个新种,命名为香港假芝 Amauroderma hongkongense Fan et Liu,模式标本保存在山西大学真菌标本室。     

马鞍菌属新种和新记录Ⅱ.

本文报道了近年来在中国发现的马鞍菌属 Heluella 的3个新种,即蛟河马鞍菌H.Jiaohensis,吉林马鞍菌 H.jilinensis 和新疆马鞍菌 H.xinjiangensis;3个新记录种即肋盖马鞍菌 H.costifera,长孢马鞍菌 H.oblongispora 和灰黑马鞍菌 H.rivularis。此外由于亚梭孢马鞍菌 H.subfusispora 的模式标本于1984年在火中被毁,因此作者在另一份标本(HMAS 30483)的基础上为其标定了新模式(Neotype)。     

Structural prediction and analysis of endothelial cell protein C/activated protein C receptor.

The endothelial cell receptor (EPCR) for protein C (PC)/activated protein C (APC) is a 221 amino-acid residues long transmembrane glycoprotein with unclear physiological function. To facilitate future studies and to rationalize recently reported experimental data about this protein, we have constructed three-dimensional models of human, bovine and mouse EPCR using threading and comparative model building. EPCR is homologous to CD1/MHC class I molecules. It consists of two domains, which are similar to the alpha1 and alpha2 domains of MHC class I molecules, whereas the alpha3 domain of MHC is replaced in EPCR by a transmembrane region followed by a short cytosolic tail. The alpha1 and alpha2 domains of CD1/MHC proteins form a groove, which binds short peptides. These domains are composed of an eight-stranded antiparallel beta-pleated sheet with two long antiparallel alpha-helices. The distance between the helical segments dictates the width of the groove. The cleft in EPCR appears to be relatively narrow and it is lined with hydrophobic/aromatic and polar residues with a few charged amino acids. Analysis of the human EPCR model predicts that (a) the protein does not contain any calcium binding pockets; (b) C101 and C169 form a buried disulphide bridge, while C97 is free, and buried in the core of the molecule; and (c) four potential glycosylation sites are solvent exposed.     

Myxinidocotyle gen.n. and Lophocotyle Braun (Platyhelminthes, Monogenea, Acanthocotylidae) with descriptions of three new species from hagfishes (Chordata, Myxinidae)

Three new species of monogencans parasitizing hagfish are described: Myxinidocotyle californica gen. et sp.n., M. japonica sp.n. and Lophocotyle novaezeelandica sp.n. The pseudohaptor of Myxinidocotyle has 8+8 transverse ridges that never attain the radial arrangement characterizing Lophocotyle and Acanthocotyle . There are no sclerites in the pseudohaptoral ridges of Myxinidocotyle and Lophocotyle . The male reproductive system of Myxinidocotyle and Lophocotyle differs from that of Acanthocotyle in having a bilateral accessory gland apparatus and an armed copulatory organ. The femrle reproductive system has a large vaginal receptaculum scminis; in Myxinidocotyle with two vagino-intestinal canals. The uterine pore and the male genital pore are close together and the vaginal pore is situated posterior to them, on the left ventral side of the body. We conclude that Myxinidocotyle, Lophocotyle and Acunrkocotyle represent different levels of acanthocotylid evolution. Myxinidocotyle being the most primitive. The family Acanthocotylidac is divided into the subfamilies Myxinidoeutylinae subfam.n., Lophocotylinae and Acanthoeutylinae.