红色旅游的特色分析及其发展研究

红色旅游作为新世纪人们一种新的旅游形式和一种新的受教育方式,正成为旅游市场关注的热点。红色旅游在新的历史时期有很多特殊的功能,具有鲜明的特色,红的内涵与意义明显。虽然现在在开发和发展中还存在一些如客源市场不稳定等问题,但还是可以针对它独特的功能和特色进行有针对性的深度开发,以期红色旅游有更大更好的发展。     

A new type of triploid crucian crap?red crucian carp (♀)×allotetraploid (♂)

A new type of triploid hybrids (TC) was produced by crossing red crucian carp (♀) with allotetraploid hybrids (♂). This type of triploids with no barbel was spindle-shaped and gray in color. Compared with their parents, some data of the morphological traits in the triploid hybrids were intermediate to those of their parents, and some were beyond their parents with heterozygous traits. Under the same culture conditions, the growth rate of the new type triploids was faster than their maternal red crucian carp (RC). The gonadal development of triploids was obviously slower than that of diploids, and the germ cells in them were degenerated. Compared with another type of triploids produced by Japanese crucian carp (♀) with allotetraploid hybrids (♂), the new type triploids not only kept faster growth rate and sterility, but also had no barbel that was similar to the common carp. The absence of the barbel in the new type of triploids has the important significance in both the inheritance and fish breeding.     

维生素D2酵母深层培养

采用生长周期短 ,易于工业化生产的酵母为实验菌株 ,以糖厂副产物甜菜糖蜜为主要原料 ,通过发酵工程技术细胞内合成麦角甾醇 ,经中波紫外线照射直接转化为维生素D2 酵母。在优化的条件下 ,每克酵母含维生素D2 15 0 0 0国际单位。经毒理实验、临床观察表明 :无毒、无副作用 ,可有效地防治维生素D缺乏性佝偻病     

甜蛋白Monellin在巴斯德毕赤氏酵母中的胞内表达

将PCR扩增得到的Monellin基因片段插入Pichia pastoris胞内表达质粒Ppic3.5k‘，然后转入Pichia pastoris SMD 1168受体菌中，用G418筛选高拷贝菌株，并进一步对其进行PCR鉴定，获得的阳性克隆菌株经甲醇诱导60h，SDS-PAGE结果显示菌株破壁液中含有表达的Monellin，其大小约为11ku，并具有甜度。     

Carbon isotopic records in paleosols over the Pliocene in Northern China: Implication on vegetation development and Tibetan uplift

Carbon isotopic composition of pedogenic carbonate can be used to estimate the proportion of C₄ and C₃ plants. Here we present carbon isotopic data of carbonate in a red earth section at Xifeng, central Loess Plateau. Results show that C₄ vegetation increased in ∼4.4 Ma B.P., stabilized between 4.0 and 3.0 Ma B.P. The character and timing of C₄ expansion on the Loess Plateau are similar, but different with other localities, e.g. Pakistan and Africa, implying that regional climate changes were main factors driving the expansion of C₄ plants. This event is comparable in timing with increased aridity evidenced by Xifeng grain size and North Pacific eolian dust records. Therefore we argue that the Pliocene expansion of C₄ plants in northern China might have been caused by the increased aridity, which in turn might be related to rapid uplift of the Tibetan Plateau.     

The genesis and environmental significance of red and black sedimentary interlayers in coral reef of well Nanyong 2

The results of paleogeomagnetics and geochemistry of the coral reef in well Nanyong 2 of Nansha Islands showed that the bottom of the black sedimentary interlayer corresponds to the conversion boundary line between Brunhes Postive Polarity and Matuyama Reversed Polarity (B/M) and the cold/warm (19/20) climatic conversion bounds on δ¹⁸O curve, 0.78 Ma ago; and the red sedimentary interlayer corresponds to the ReunionⅠpolarity excursion (reversion) of the geomagnetic field, 2.01—2.04 Ma ago. Comparing with the normal light-coloured coral reef rock, the magnetic susceptibility (c), residual magnetization intensity (Mr) and the content of MnO and Fe₂O₃ of the black sedimentary layer appeared obviously positive abnormity. The magnetic susceptibility (c), residual magnetization intensity (Mr) and the content of Fe₂O₃ of the red sedimentary layer also appeared positive abnormity. Combining with the analyzing results of paleontology, we hold that this pair of special and typical sedimentary interlayers was relative to the sudden change of paleoclimate, i.e. the global climatic change and its incidental polarity reversal of the geomagnetic field directly affected the living environment of the paleontological species as well as the dispersion and enrichment of some chemical elements, especially the elements sensitive to redox such as Fe and Mn. For example, the elements Fe and Mn concentrated in the glacial period would be largely oxidized and diluted when the climate warmed up suddenly, and the originally oxidized high valence Fe would be condensed again when the climate cooled suddenly. This is possibly one of the important reasons of appearing and disappearing of the red and black sedimentary events of coral reef in well Nanyong 2.     

The ecological sequence of Hipparion fauna in the mid-dle reaches of the Yellow River during Neogene

The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4-6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humid period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the climatic conditions in Pliocene are drier than that in late Miocene. The clay-skin content of red clay, which has a synchronous change with faunal features, is a rather good replacing palaeoclimatic index.     

The ecological sequence of Hipparion fauna in the middle reaches of the Yellow River during Neogene

The faunal ecological type and sequence in the Tertiary red clay indicate that Hipparion fauna during the period 7.4–6.1 Ma in the middle reaches of the Yellow River is composed mainly of dorcadoides and mixed types. This represents semiarid veld environment with small fluctuation. The fossil assemblages characterized by the abundance of gaudryi types and even the occurrence of some Hominoid and Chalicotherium indicate an obviously warm and humi period since 5.3 Ma. The fossil assemblages during 3.4 Ma show the typical steppe fauna representing dry climate. It is indicated by the changes of ecological sequence that the climatic conditions in Pliocene are drier than that in late Miocene. The clay-skin content of red clay, which has a synchronous change with faunal features, is a rather good replacing palaeoclimatic index.     

海嘧啶抗肿瘤作用机制的研究

研究了海嘧啶抗肿瘤作用的机制,观察了海嘧啶对荷瘤小鼠红细胞免疫粘附肿瘤细胞的功能以及对红细胞膜及肿瘤细胞膜上唾液酸的含量的影响.结果表明海嘧啶可以提高荷瘤小鼠抗肿瘤免疫功能,提高红细胞膜上唾液酸的含量,而使肿瘤细胞上的唾液酸含量降低.这可能其抗肿瘤作用的机制之一.     

超细Co-γ-Fe_2O_3磁粉的研制

应用TEM、XPS、XRD等分析技术,研究了包钴过程中各种因素对钴改性γ-Fe_2O_3磁粉的微观结构以及磁性能的影响。结果表明,钴铁氧体的形成是Co-γ-Fe_2O_3磁粉磁性能提高的主要原因。包少量钴(钴含量<1%),可使原磁粉的矫顽力提高约6.37kA/m。