真蓝甲藻(Gymnodinium eucyanochroum Tseng Sp.nov.)的亚微结构、色素性质及其在藻类进化中的意义

本文报告了在南京发现的蓝色裸甲藻,测定了它的藻胆色素。证明蓝色藻胆蛋白不是山“胞内蓝藻”(Cyanellen)所提供。电子显微镜的扫描表明细胞表面有众多的突起,不是光滑的;横沟内的鞭毛不是“带状”而是由细纤维丝膜状物拉着的螺旋形。透视电子显微镜观察表明,该藻有两个类型的细胞核,即“甲藻核结构”(Dinocaryotic structure)和“真核结构”,(Eucaryotic Structure),真核与叶绿体有一个共同的膜的包被,有一个与原生动物相近似的伸缩泡系统。叶绿体是分枝状,在细胞的边缘位,但也有其它形态。有淀粉颗粒而无“造粉核”或称”“蛋白核”(Pyrenoid),多数位于叶绿体外或之间,类囊体与一般甲藻不同,不是三个排成一条“带”而是两个排列成“带”。有发达的线粒体,和高尔基体;鞭毛不论纵沟内的或横沟内的,其横切面,均为9+2的形式,其纵切面是由纤维丝成束的结构。蓝色色素提取物,可见光最大吸收峰为456nm,与隐藻藻胆色素十分相似。从细胞亚微结构及其色素性质,作者认为它是藻类演化过程中的一个中间类型的甲藻共生体。     

Co、Ni、Cu、Zn离子对蓝藻藻胆体光谱影响研究

应用吸收光谱和荧光光谱的方法研究了Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）和Ｚｎ（Ⅱ）４种重金属离子对螺旋藻及其藻胆体—类囊体膜的作用．４种金属离子可降低藻胆体在６２４ｎｍ的特征光吸收峰，并使藻胆体—类囊体膜的发射荧光峰下降、蓝移，使Ｆｐ／Ｆｃ（藻胆与叶绿素荧光比值）升高．这些结果表明，藻胆体是重金属离子作用的重要位点这一．在四种重金属中，Ｃｕ（Ⅱ）的作用最强．     

极大螺旋藻藻蓝蛋白性质的研究

用凝胶电泳、吸收光谱、荧光光谱、示差扫描量热计（ＤＳＣ）和循环伏安法研究了极大螺旋藻（Ｓｐｉｒｕｌｉｎａｍａｘｉｍａ）藻蓝蛋白的性质，结果表明：该蛋白由大小两个亚基组成，分子量分别为１９ＫＤ和１７ＫＤ。吸收光谱显示，该蛋白在３４８ｎｍ和６２０ｎｍ有吸收峰。其荧光发射峰位于６４６ｎｍ。该蛋白的热变性温度范围在４０℃～５４℃附近。该蛋白的循环伏安扫描曲线显示，当扫描速度为０．１Ｖ／ｓｅｃ时，有一个明显的氧化峰。当扫描速度大于０．２Ｖ／ｓｅｃ时，呈现两个氧化和两个还原峰     

Alteration of early T lymphocyte count in patients with herpes genitalis.

Peripheral blood samples from 52 women, including 16 with herpes genitalis and 36 healthy persons, were studied to enumerate subpopulations of lymphocytes. It was found that the mean percentage of 'active' T lymphocytes was significantly less in the patients with herpes genitalis than in the controls.     

SHRIMP U-Pb geochronology of the detrital zircons from the Longshoushan Group and its tectonic significance

Sixty-two geologically meaningful U-Pb dates were obtained by using SHRIMP technique for the detrital zircons in three metasedimentary rocks from stratigraphically uppermost parts of the Longshoushan Group in the present study. Eighty percents of these dates range from 1.7 Ga to 2.2 Ga with a peak at 1.8-2.0 Ga and twenty percents from 2.3 Ga to 2.7 Ga. The youngest detrital zircon is dated at 1724±19 Ma which is interpreted as the maximum depositional age of the metasedimentary rocks. Therefore, the age for the diagenesis and lithification of the original sedimentary rocks of the Longshoushan Group before the metamorphism must be younger than 1724±19 Ma. Comparison of the age histograms of these detrital zircons with the ages of the igneous rocks on the surrounding older massifs suggests that the sediments of the Longshoushan Group were most likely derived from the Alaxa Block and Tarim Craton. This implies that the affinity between Alaxa Block and Tarim Craton was strong and that they might have been a unified craton during middle-early Proterozoic time.     

The Dongcaohe ophiolite from the North Qilian Mountains： A fossil oceanic crust of the Paleo-Qilian ocean

The Dongcaohe ophiolite, located at the south of the North Qilian subduction complexes, is a tectonic block with an exposed area of about 3 km×6 km. It consists of an intrusive section overlain by an ex- trusive section. The lower part of the intrusive section consists of cyclic layers of cumulate dunites, troctolites, anorthosites, anorthositic gabbros, and gabbros with small discordant dunite and troctolite bodies. This layered sequence grades upward to isotropic gabbros and gabbronorites, which are overlain by the extrusive sequence of diabasic sheeted dikes and basaltic lavas. The overall mineral crystallization sequence was olivine±Cr-spinel, plagioclase, clinopyroxene, orthopyroxene, and Fe-Ti oxides. The Cr-spinel (Mg#: 42-66, Cr#: 41-57) in these layered cumulates and present-day abyssal peridotites have similar compositions. Also, the compositional variations of the plagioclase and cli- nopyroxene in the intrusive section reflect crystallization from melts compositionally similar to the present-day ocean basalts. Moreover, the rare earth element (REE) and multi-element distribution pat- terns of the intrusive and extrusive lithologies in the Dongcaohe ophiolite are consistent with crystal- lization of mid-ocean ridge basalts. The zircon grains separated from the gabbronorite have an SHRIMP average 206Pb/238U weighted age of 497 ± 7 Ma, which is considered as the tectonic emplacement age of the Dongcaohe ophiolite. The field occurrence, mineral and whole-rock compositions indicate that the Dongcaohe ophiolite represents a well-persevered oceanic crustal fragment composed of a complete oceanic crustal section of layered cumulates at bottom upgrading through isotropic cumulates to sheeted dikes and lava flows.     

Pause or No Pause？--Prosodic Phrase Boundaries Revisited

This study presents evidence from analyses of the acoustic parameters of fluent continuous speech to show that within-paragraph prosodic phrase boundaries are related more to contrasts of neighborhood prosodic states rather than between-phrase pause durations; prosodic states receive more constraints from higher level discourse information. By revising a modular acoustic model by Tseng＇s hierarchical prosodic phrase grouping framework and examining the much varied prosodic phrase （PPh） boundary B3 within speech paragraph, we show that statistical accounts of layered contributions reveal distinct contrasts between boundary immediate duration and intensity patterns irrespective of pause duration. Contrasts of FO contour patterns were also observed in these locations. Evidence was also obtained to illustrate how PPh boundary states are specified more by higher level discourse information than by lower level prosodic word construction. These combined results suggest that contrastive neighboring prosodic states are more significant cues to PPh boundaries than boundary pause duration. The results also help explain why in fluent speech between-phrase pause durations vary greatly, and can be applied to automatic speech segmentation.