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91.
Eviostachya hoegii Stockmans在中国五通组的首次发现 总被引:2,自引:0,他引:2
首次描述了Eviostachya hoegii Stockmans的营养部分,通过大量标本的观察,修订了前人有关其生殖部分和解剖部分的描述,并对其生殖部分进行了复原.同意Emberger(1968)的观点,将其归于Eviostachyrales中. 相似文献
92.
93.
滇西晚石炭世 Triticites 带的苔藓虫,产于施甸的10种,内含1新种,群体形状单一,生活于温暖、清洁、高能、面向外海的硬基底浅海区;产于腾冲的只有1种,是低能深水特提斯区分子.早二叠世苔藓虫12种,内含1新种,产耿马永德组 Polydiexodina 带之下,系特提斯区分子,据对其中的3层苔藓虫的硬体类型及标本数量分析,耿马含苔藓虫地层代表一个海侵过程. 相似文献
94.
论晚二叠世的“克氏蛤” 总被引:6,自引:3,他引:3
系统评述目前世界上出现的晚二叠世克氏蛤类标本,并描述采自贵州,云南藏东的有关化石1属3种。其中1新属1新种,右壳足丝凹口特征在克氏蛤类研究中具有重要意义。晚二叠世的Claraioides gen.nov.以足丝凹口内端明显向腹方或后腹方扩展膨大成足丝凹湾而不同于早三叠世的Claraia.后者似由前者演化而来,它们在二叠-三叠系界线附近发生替代,可能与古生代末的绝灭事件相关。 相似文献
95.
文章通过贵州盘新塘原下二叠统下部紫松阶珊瑚化石的分析,将该地层划归上石炭统上部。描述上炭统威宁阶,过岩阶和紫松阶的四射珊瑚6属7种,其中5新种,通过对这些珊瑚的形态构造进行了剖析,略述了该地区在晚石炭世的环境特征。 相似文献
96.
The rates of canopy apparent photosynthesis (PC) and canopy respiration (Rc) were studied during vegetation season in two erectophile and two planophile hybrids of maize (Zea mays L.) grown at two canopy densities [7.5 plants m-2 (HD) and 4.5 plants m-2 (LD)]. Large differences in PC, Rc, RC/PC, leaf area index (LAI), dry matter accumulation and grain yield were found among hybrids and plant densities. Variations in PC and RC were associated mainly with changes in LAI. There was also found change in PC per unit LAI with time. The average RC/PC was 28.9 % for all treatments throughout the vegetation season. PC and RC per unit dry matter were higher in LD than in HD and decreased throughout the measurement period. The HD stand had higher PC and yield in hybrids with erectophile foliage, whereas LD stand had higher PC after male tetrad and got higher yield in hybrids with planophile foliage. Only RC in hybrids of the two foliage types was higher under HD than under LD throughout the vegetation period. 相似文献
97.
<正> 我们用国内的新鲜酵母为材料,从中分离纯化到一种多肽——酵母多肽,其分子量为14kD。在低血清培养体系中能促使人成纤维细胞(HFB)和人脐静脉内皮细胞(HUVEC)的DNA合成。当培养液中酵母多肽的浓度为1μg/mL时能引起最大的刺激作用。但此多肽对胎牛心脏内皮细胞(FBHEC)的DNA合成则无作用。 相似文献
98.
Kang Wang Hui Lin Conghui Peng Lin Sun Yahui Gao Baohong Chen 《Global Change Biology》2023,29(17):5099-5113
Noctiluca scintillans is one of the most common harmful algal species and widely known due to its bioluminescence. In this study, the spatial distribution, seasonal variations, and long-term trends of N. scintillans blooms in China and the related drivers were analyzed and discussed. From 1933 to 2020, a total of 265 events of N. scintillans blooms were recorded in Chinese coastal waters, with a total duration of 1052 days. The first N. scintillans bloom occurred in Zhejiang in 1933, and only three events were recorded before 1980. From 1981 to 2020, N. scintillans caused harmful algal blooms (HABs) almost every year, both the average duration and the proportion of multiphase HABs showed an increasing trend. 1986–1992, 2002–2004, and 2009–2016 were the three peak periods with a frequency of no less than five events of N. scintillans blooms per year. In terms of spatial distribution, N. scintillans blooms spread from the Southeast China Sea to the Bohai Sea after 2000, Guangdong, Fujian, and Hebei were the three provinces with the highest numbers of recorded events of N. scintillans blooms. Moreover, 86.8% of the events of N. scintillans blooms occurred in spring (March, April, and May) and summer (June, July, and August). Among environmental factors, the dissolved inorganic phosphate, dissolved silicate and chemical oxygen demand were significantly correlated with the cell density of N. scintillans during N. scintillans blooms, and most of N. scintillans blooms were recorded in the temperature range of 18.0–25.0°C. Precipitation, hydrodynamics, water temperature, and food availability might be the main factors affecting the spatial–temporal distribution of N. scintillans blooms along the Chinese coast. 相似文献
99.
100.
Wen Gao Ying Xu Jianxiang Liu Xiaolei Wang Xinhong Dong Guigen Teng Binbin Liu Jinpei Dong Chaoyi Ge Hui Ye Xuezhi Zhang Hong Cheng 《Helicobacter》2023,28(2):e12947