LUDLOVIAN GRAPTOLITE FAUNAS OF THE YANGTZE GORGES DISTRICT AND THEIR STRATIGRAPHICAL SIGNIFICANCE

Ⅰ.INTRODUCTIONThe Silurian stratigraphy of the Yangtze Gorges district has been reportedby various authors since this century.Early in 1924 J.S.Lee and Y.T.Chao subdivided the Silurian of Sintandistrict into two parts—the lower Lungma shale and the upper Sintan forma-tion,thus laying down the fundation of the silurian stratigraphy of China.Inthe following year C.Y.Hsieh and Y.T.Chao went to Lojoping area of I-Chang district and again subdivided the Silurian of that area into three sub-     

钾营养对水稻光合器功能的效应与谷粒产量的影响

水稻广陆矮四号和威优35盆栽试验的结果表明,施钾使叶绿体内基粒增多,Hill反应及光合磷酸化活力增强。分蘖末期在叶绿体反应液中添加KCl也可提高非环式光合磷酸化活力。适量施钾降低量子需要量可能与上述效应有关。钾使叶片超微结构改善:乳突大而多;硅化程度明显增加,故叶片更直立。叶水势及净光合率提高,两者呈直线正相关。灌桨期剑叶净光合率与谷粒产量呈直线正相关。     

杂色曲霉在人胃液中体外培养产生杂色曲霉素的研究

本文用正交实验设计法探讨了杂色曲霉(Aspergillus versicolr)在加有两类不同性质营养物的人胃液中产生杂色曲霉素(Sterigmatocystin,简称ST)的条件。发现在26℃斜面静置培养12天后可产生ST。加入半合成物质的最佳配伍是:蔗糖1,000.0mg;蛋白胨50.0mg;KH_2PO_4 7.5mg;MgSO_4·7H_2O_2.5mg;人胃液10.0ml,称之为SPKM人胃液培养基。加入天然物质的最佳配伍是:玉米粉0.5g;豆腐粉0.25g,人胃液10.0ml,称之为CS人胃液培养基。还进一步研究了pH值和培养时间对杂色曲霉产毒菌株在SPKM和CS人胃液培养基中生长及产生ST的影响。根据临床胃酸缺乏程度分级标准,分为pH 1.0,3.0,6.5,8.0四个组。发现在两种人胃液培养基中,无论是杂色曲霉生长,还是产生ST,pH3.0到6.5是发生质变的范围。在两种人胃液培养基pH为6.5时,37℃静置培养8天有痕量ST产生,10天后就明显增加。所以杂色曲霉产生的ST可能是慢性萎缩性胃炎易癌变的原因之一。     

倭竹属地理分布的研究

倭竹属Shibataea Makino隶于禾本科之竹亚科,现已知有8种,分布于我国东南部的浙江、福建、江苏、安徽、江西等省,广东、台湾两省有少量栽培,日本产1种。苏联、西德、印尼等国所栽培的倭竹均系自我国或日本引入。我国浙-闽地区产8种,且都有野生发现,是本属的现代分布中心。倭竹属植物体型矮小,常植于庭院或公园中供观赏。近年来盆景艺术迅速发展,微型园林日益兴起,倭竹属植物体态优美,常绿,耐寒且易于栽培,为广大园林工作者所垂青。     

An Intermediate Category of Seed Storage Behaviour?: I. COFFEE

Seeds of four cultivars of arabica coffee (Coffea arabica L.)were tested for germination following hermetic storage for upto 12 months at several different combinations of temperaturesbetween –20 °C and 15 °C and moisture contentsbetween 5% and 10% (wet basis). Most of the seeds from one cultivarwithstood desiccation to between 5% and 6% moisture content,a seed water potential of approximately –250 MPa, butthose of the remaining three cultivars were much more sensitiveto desiccation damage. Moreover, in all four cultivars, seedlongevity at cool and sub-zero temperatures, and at low moisturecontents did not conform with orthodox seed storage behaviour:viability was lost more rapidly under these conditions thanat either warmer temperatures or higher moisture contents. Theresults confirm that coffee seeds fail to satisfy the definitionsof either typical orthodox or recalcitrant seed storage behaviour.These results, therefore, point to the possibility of a thirdcategory of storage behaviour intermediate between those oforthodox and recalcitrant seeds. One of the main features ofthis category is that dry seeds are injured by low temperatures. Key words: coffee, Coffea arabica L., seed storage, seed longevity, desiccation, temperature     

鸽血变虫（Haemoproteus columbae Kruse,1980）生活史研究

本文首次报告我国鸽血变虫的生活史。自然和人工感染实验证明虱蝇是其昆虫媒介。本虫的配子体进入虱蝇体内6—10天后完成孢子有性增殖。 实验观察了本虫在鸽体内无性增殖期的形态、部位及在末梢血液中配子体的发育过程,并证明其潜隐期(prepatent period)为28—30天。 本工作亦对羽虱体腔中的卵囊和子孢子作了描述,提示羽虱也可能是本虫的媒介昆虫,有待今后研究证实。     

心室压力瞬时加速度的测定及其意义

本工作对国产SJ-42型四道生理记录仪进行改进,增加了记录压力二阶微分曲线的功能。经比较研究家兔左心室压力一阶微分与二阶微分指标后发现,(d~2p/dt~2)max对心肌变力作用的敏感性比(dp/dt)max高出1/3左右,两项指标对心脏前后负荷和心率均具有一定的依赖性,但两者间无明显差异,提示用心室压力瞬时加速度指标评价心脏收缩性能比用压力瞬时速率指标更为灵敏可靠。     

吗啡耐受大鼠心房心钠素的释放及其基因转录

本工作应用心钠素放射免疫测定和分子杂交技术首次发现,吗啡耐受大鼠血浆心钠素水平显著降低,心房内心钠素含量明显升高,同时心房内心钠素特异性mRNA水平也相应提高,提示在吗啡耐受时大鼠心房内心钠素的合成和贮存增加,释放减少。     

Response of Seed Germination in Three Genera of Compositae to White Light of Varying Photon Flux Density and Photoperiod

Various photon doses (net number of photons per unit area perday), provided by varying both photon flux density and photoperiod,were applied to imbibing seeds of seven lots of four speciesof Compositae in various germination test regimes. In all fourspecies germination was dependent upon photon dose, the productof photon flux density and daily duration of exposure. The responsewas quantified by linear relations between the probit of percentagegermination and the logarithm of photon dose. In general, photonflux density and photoperiod only influenced the stimulationof germination by the low energy reaction indirectly (as factorsof daily photon dose), whereas there was a tendency for photoperiodto have a direct influence on the inhibition of germinationby the high irradiance reaction. Reducing the germination testtemperature from 25?C to 20?C and 15?C not only increased thedark germination of L. sativa L., but also broadened the photondose range at which full germination occurred by reducing theminimum value necessary for the germination of the most dormantseeds, and increasing the maximum value which failed to inhibitthe germination of any seeds. Differences between L. sativaand L. serriola L. in the response of germination to white lightwere only quantitative, rather than qualitative. The singlemost promotory dose for all four species was 3 ? 10^–3mol m^–2 d^–1, although the inhibitory action of dosesup to 10– mol m– d– was generally only slight. Key words: Light, seed germination, seed dormancy, Compositae     

Production of a foreign protein product with genetically modified plant cells.

Plant cells (Nicotiana tabacum) were genetically engineered to produce a foreign protein, chloramphenicol acetyltransferase (CAT), and the CAT production from suspension cultures was investigated. Suspension cultures were grown in a shake flask, a stirred fermenter, and a bubble-column fermenter. The CAT production was growth related and the maximum activity was reached during the early stationary phase. A 41-day, semicontinuous stirred fermenter run, consisting of five sequential batch runs, demonstrated long-term CAT production. Continuous CAT production was also accomplished in a bubble-column fermenter at a medium flow rate of 3.1 ml h-1, which was equivalent to a dilution rate of 0.25 day-1.