牛细胞核移植试验初报

体外成熟培养（ＩＶＭ）２３－２４ｈ的牛卵母细胞，去核后用８０Ｖ／ｍｍ，４０μｓ电激活２次（Ｉ组）或不激活（Ⅱ组），然后注入８－３２细胞期体外受精（ＩＶＦ）牛胚胎的卵裂球，再用８０－１００Ｖ／ｍｍ，４０μｓ电激两次诱导卵母细胞与卵裂球融合，两组的融合率（６２．８％与６５．１％）和卵裂率（５５．４％与５１．９％）无显著差异（Ｐ〉０．０５）。全部４１２枚重组卵电激后的融合率是６３．８％（２６３／４１２）     

滕北煤系上覆地层的孢粉组合及其地层意义

本文根椐腾北煤田煤系上覆地层中发现的生物化石组合,进一步阐述了鲁西南地区晚侏罗世地层的存在,并首次发现了该区零星分布的老第三纪中—晚始新世官庄组沉积,为本区中、新生代地层层序的建立奠定了基础。     

全新世以来长江口演变影响因素探讨

利用历史地理资料和地貌、水文等方面的前人研究成果,针对长江口地区是中国经济最发达的地区之一,它的大部分地区尤其是长江北岸沿海平原的如皋、南通、上海的一部分成陆时间相对较晚,在它们的成陆过程中,河口沙洲起了重要作用,可是河口沙洲的成陆模式还是有许多未解决的、没有达成统一共识的问题做了初步研究.认为:河口地区在发育过程中不仅有河流径流及海洋的水动力因素,而且人类活动等在长江口成陆过程中也发挥了促进或减缓成陆速度的作用.其中人类活动在公元4世纪后的影响变得十分显著.     

A preliminary report on the newly found Tianyuan Cave, a Late Pleistocene human fossil site near Zhoukoudian

The Tianyuan Cave is the only human fossil-bearing site containing rich mammalian fossils found in the last decades near Zhoukoudian. Up to now more than 34 specimens of the human body have been recovered, and the mammalian fossils can be put into 29 species. Cervids dominate the fauna, and carnivores are very rare. Based on the primary examination, the human fossils can be attributed to the species Homo sapiens. All the mammalian fossils, except one between tooth of Crocuta belong to the species that still exist today. But some of them are the first records in fossil form north of the Yellow River, such as Arctonyx and Capricornis. Based on the mammalian fauna study, it seems that the Tianyuan Cave can be correlated with the Upper Cave.Sixty-three percent of the species of the mammalian fauna from the Tianyuan Cave are also present in the Upper Cave.The characters of the deposits also share some similarities between the Tianyuan Cave and the Upper Cave; both of them are mainly composed of breccia without cement. The dating using the U-series method on deer tooth samples indicates that the geological age of the new site is around 25 thousand years B.P. This is the first discovery of human sites outside the core area of the Peking Man Site at Zhoukoudian,which throws new light onto this world famous site complex.     

简论清末新政经济改革的历史作用

清末新政在经济改革中的各类经济法规的制定与颁行 ,在中国法律史上有着前驱先路的重要历史地位 ,对近代中国经济法制建设产生了重要影响 ;新政的重商与奖励实业政策 ,极大地促进了民间投资和商人社会地位的提高 ;商会的建立 ,为民族资产阶级初步形成一支独立的阶级队伍而登上历史舞台创造了条件 ;一系列发展资本主义经济的措施 ,使这一时期中国经济建设达到了前所未有的高潮     

论清末社会性情感小说的主题

清末的社会性情感小说是言情小说的一种,但因它对“情”描写的缺乏和说教意味的浓厚,所以它又不是完整意义上的言情小说。清末特殊的社会、政治、文化背景,对小说家的创作产生了深刻的影响,使得清末社会性情感小说形成了“借儿女言家国”、“借儿女言节义”、“借儿女言自由”等三种最具代表性的主题模式,这种主题模式虽然流行很短,但在近代小说转型史上是具有历史意义的,同时,它也为言情小说在清末的发展铺平了道路。     

Summer sea-surface temperatures and climate events on the North Icelandic shelf through the last 3000 years

Diatom data from core MD992271 on the North Icelandic shelf record a cooling trend through the last 3000 years. This is indicated by a general decrease in warm water species and an increase in cold water taxa. The relative abundance of these two diatom groups changed periodically, suggesting that the climate also fluctuated within this time period. The results of diatom-based transfer function calculation show that the summer sea-surface temperatures (SSTs) before 1400 cal. a BP were generally higher than the mean value for the last 3000 years and the summer SSTs fluctuated around the mean between 1400 and 700 cal. a BP, and dropped to the values below the mean after 700 cal. a BP. Four cooling events were distinguished, centered at around 2600, 1900, 1300 and 600 cal. a BP respectively. The results are not only consistent with the data from neighbouring cores HM107-03 and MD992275, but also comparable with those from the GISP2 ice core and from other marine sediment records in the North Atlantic. This suggests that changes in the summer SSTs reflect regional climate variations in the North Atlantic. On the North Icelandic shelf, the summer SST variation is a result of changes in the in-teraction between the cold and the warm currents in the area.     

论梁佩兰的“独醒”与其仕清之选择

梁佩兰为“岭南三大家”之一,年轻时即热衷仕进。他积极入仕新朝,与他对明末清初的局势的认识有着一定的联系。他认为满清军队已经基本上占领了全国,仅凭岭南一隅已不可能再有作为。甚至嘲笑一些抗清志士行为迂阔,于事无补。自己则希望趁各方政治势力都急需人才的时候,及早入仕。闲吟牡丹,不说兴亡是他对明末之事采取的态度。由于这种心迹不便宣讲,致使他产生强烈的孤独感。这种心迹是当时许多入仕新朝者所共有的,因人人讳言,反而使梁佩兰的这些作品显示出其独特的价值,成了解读时人心态的不可多得的作品。     

论晚期希腊哲学在西方哲学中的价值

从对古希腊哲学发展历程和西方哲学传统与基本精神的分析入手,晚期希腊哲学是有其合理性和积极价值的。它的价值在西方哲学外部表现为:开启了其后继者罗马人的思辨之路、丰富和扩展了它的文明,进而奠定了整个欧洲文明的走向,并在文明传播和扩展的过程中开了东西方哲学和文明交流之先河。而就西方哲学本身的发展而言,它在哲学精神、思维方式和研究方法上也深深影响了西方哲学的发展与走向。