Evidence against a significant younger dryas cooling event in new zealand

Pollen records of deglacial sequences from northwest Nelson, New Zealand, demonstrate that there was no significant temperature decline associated with the Younger Dryas in New Zealand. Records of glacial advances at this time were either the product of increased snow accumulation under enhanced precipitation regimes or random variation rather than the result of a regional thermal decline. This finding supports those models of Younger Dryas initiation that require neither enhanced westerly circulation nor significant thermal decline in the Southern Hemisphere.     

Ages of fossil penguins in new zealand

The age of a New Zealand specimen generally believed to represent the oldest known penguin, hitherto considered early Eocene (Heretaungan), has been restudied by the New Zealand Geological Survey and is early Miocene. The oldest known penguins are from the late Eocene. The reported great range of a single species, Palaeeudyptes antarcticus, from late Eocene to late Oligocene or early Miocene (Kaiatan to Waitakian) is not acceptable. Dating of some other specimens is less precise than previously reported.     

Uplifted marine terraces along the alpine fault, new zealand

Three types of evidence indicate that marine terraces are widespread in the Southern Alps of New Zealand. (i) Remnants of shore platforms occur as distinct levels of notched ridge crests and flat summits; degraded sea cliffs are common. (ii) Scattered quartz beach pebbles occur on 16 of 18 levels of exhumed shore platforms in the Fox- Franz Josef type area to altitudes as high as 1700 meters. (iii) Altitudinal spacings of New Zealand terrace flights allow correlation with 18 dated global marine terraces at New Guinea, which were formed during glacio-eustatic highstands of sea level within the last 336 x 10(3) years. Inferred uplift rates at Fox-Franz Josef increased from 3.2 to 7.8 meters per 10(3) years since about 135 x 10(3) to 140 x 10(3) years ago, presumably because of increased convergence between the Pacific and Australian plates.     

Paleomagnetic chronology of pliocene-early pleistocene climates and the plio-pleistocene boundary in new zealand

The paleomagnetic chronology established for a Pliocene-Early Pleistocene sequence of marine sediments in New Zealand reveals that marked climatic coolings based on Foraminifera and oxygen isotope ratios in the late Cenozoic preceded the Pliocene-Pleistocene boundary, which is taken to be at the base of the Gilsá geomagnetic polarity event (1.79 million years ago). Major temperature fluctuations occur from the upper Gauss (Middle Pliocene) to middle Matuyama (Early Pleistocene). The first major Pliocene cooling spans the Gauss-Matuyama boundary (2.43 million years ago). A uniform and rapid (40 centimeters per 1000 years) rate of deposition is shown for the moderately shallow marine environment.     

Elemental anomalies at the cretaceous-tertiary boundary, woodside creek, new zealand

Iridium and 26 other elements were determined in shale from the Cretaceous-Tertiary boundary at the locus classicus (for iridium anomalies) at Woodside Creek, New Zealand. Iridium, gold, copper, cobalt, chromium, nickel, arsenic, molybdenum, and iron were enriched in the basal 2 millimeters of the 8-millimeter shale parting as compared with the rest of the stratigraphic column. No other shale partings in the column had anomalous concentrations of any element when the data were expressed on a carbonate-free basis. The boundary material showed striking compositional similarities with the Stevns Klint Danish boundary shale. Elemental concentrations were in general much higher in the New Zealand material than in nonboundary shales from elsewhere in the world. The high concentration of iridium (153 nanograms per gram) in the basal layer of the boundary, together with the enrichment of other siderophile elements supports the idea of an extraterrestrial source for much of the material. The iridium/gold ratio of 2.1 is also in accordance with such a source. The iridium content of the basal layer is higher than for any other marine boundary shale obtained on land. The integrated iridium value is 187 nanograms per square centimeter of boundary surface.     

Waves of larch budmoth outbreaks in the European alps

Spatially extended population models predict complex spatiotemporal patterns, such as spiral waves and spatial chaos, as a result of the reaction-diffusion dynamics that arise from trophic interactions. However, examples of such patterns in ecological systems are scarce. We develop a quantitative technique to demonstrate the existence of waves in Central European larch budmoth (Zeiraphera diniana Gn.) outbreaks. We show that these waves travel toward the northeast-east at 210 kilometers per year. A theoretical model involving a moth-enemy interaction predicts directional waves, but only if dispersal is directionally biased or habitat productivity varies across the landscape. Our study confirms that nonlinear ecological interactions can lead to complex spatial dynamics at a regional scale.     

Soil quality and financial performance of biodynamic and conventional farms in new zealand

Biodynamic farming practices and systems show promise in mitigating some of the detrimental effects of chemical-dependent, conventional agriculture on the environment. The physical, biological, and chemical soil properties and economic profitability of adjacent, commercial biodynamic and conventional farms (16 total) in New Zealand were compared. The biodynamic farms in the study had better soil quality than the neighboring conventional farms and were just as financially viable on a per hectare basis.     

Application of carbon isotope stratigraphy to late miocene shallow marine sediments, new zealand

A distinct (0.5 per mil) carbon-13/carbon-12 isotopic shift in the light direction has been identified in a shallow marine sedimentary sequence of Late Miocene age at Blind River, New Zealand, and correlated with a similar shift in Late Miocene Deep Sea Drilling Project sequences throughout the Indo-Pacific. A dated piston core provides an age for the shift of 6.2 +/- 0.1 million years. Correlations based on the carbon isotopic change require a revision of the previously established magnetostratigraphy at Blind River. The carbon shift at Blind River occurs between 6.2 and 6.3 +/- 0.1 million years before present. A new chronology provides an age for the evolutionary first appearance datum of Globorotalia conomiozea at 6.1 +/- 0.1 million years, the beginning of a distinct latest Miocene cooling event associated with the Kapitean stage at 6.2 +/- 0.1 million years, and the beginning of a distinct shallowing of water depths at 6.1 +/- 0.1 million years. The Miocene-Pliocene boundary as recognized in New Zealand is now dated at 5.3 +/- 0.1 million years. Extension of carbon isotope stratigraphy to other shallow Late Miocene sequences should provide an important datum for international correlation of Late Miocene shallow and deep marine sequences.     

转基因生物核酸检测新技术研究进展

总结了基于核酸扩增的转基因产品检测方法以及扩增产物的分析技术,并对该技术在转基因生物检测中的应用进行了展望.     

Venus southern hemisphere: geologic character and age of terrains in the themis-alpha-lada region

Arecibo high-resolution radar images of the southern hemisphere of Venus extending to 78 degrees S show that the surface of the Themis-Alpha-Lada region is characterized by linear deformation zones with volcanoes and corona-like features and by regional volcanic deposits (primarily plains, small shields, and large edifices). Large-scale areal deformation is limited to the tessera of Alpha Regio. Lada Terra, in the southern high latitudes, contains several large coronae, in contrast to Ishtar Terra in the northern high latitudes. The density of craters of possible impact origin is somewhat lower than that observed in the Venera 15 and 16 coverage; these data extend to 43 percent of the areas of the surface of Venus with ages of less than about 1 billion years.     

四川无融合生殖水稻研究新进展

本文着重报道了四川无融合生殖水稻材料的研究新进展,并对国内有代表性的无融合生殖水稻材料的利用价值进行了讨论。     

南方花生新品种区试(莆田点)试验小结

对9个花生新品种和对照种（汕油523）进行了抗逆性、农艺性状、适应性和丰产性试验。结果显示，粤油193、泉花327、汕油523表现抗旱、抗倒、耐涝；10个品种对叶斑病、锈病、枯萎病均有不同程度的抗性；产量方面，小区产量最高的为湛油41，其次为泉花327，产量表现较好的还有粤油79、辐选7号等。并对不同品种在南方地区不同环境条件下的适应性进行了探讨。     

新时期农民教育培训方向的思考

党中央提出了建设社会主义新农村的重大历史任务,全面推进农村物质文明、精神文明、政治文明与和谐社会建设。在这样一个新的历史时期,农民教育培训要围绕社会主义新农村建设,并与解决"工农"问题结合起来,在思想文化方面,培育农民的人文精神;在科学技术方面,培育农民的就业和创业能力;在生产生活方面,培育农民的职业意识和社会意识。构建适应新农村建设要求的农民终身教育机制。     

牛伪狂犬病研究进展及免疫前景分析

阐述了牛伪狂犬病流行病学现状、病毒分子生物学研究状况、疾病诊断和免疫学成果,并对免疫学发展前景进行了分析。     

Bronze age copper sources in the mediterranean: a new approach

Efforts by scientists to locate the sources of copper used in ancient Mediterranean and Near Eastern cultures through comparative chemical analyses of copper ores and archeological artifacts have largely failed for various mineralogical and metallurgical reasons. The isotopic composition of lead, an element present in a minor amount in many copper ores and bronze objects, is unchanged through metallurgical processes and may in principle be used to determine the sources of the copper used in Bronze Age artifacts. Results suggest that for Late Bronze Age Crete the Laurion region in Attica, Greece, may have been a more important copper source than Cyprus.     

中国南方绿豆新品种及高产配套栽培技术

绿豆是一种抗逆性很强的作物,生育期短、播期弹性大、适应性广,利于用地、养地,而且经济效益较高,深受农户喜爱.     

2006年全国南方区花生新品种区域试验

2006年,以汕油523为对照,7省区11个花生新品种参加全国(南方区)花生新品种区域试验。结果表明,与对照相比,泉花052、闽花8号、粤油290、闽花10号的干荚果和籽仁产量有所降低,桂花026-10、汕油851等其他7个品种则有不同程度增加,增加幅度分别为0.15%~9.85%、0.83%~7.52%。湛红2号、粤油290、泉花052、汕油851等品种的产量静态稳定性好,而桂花026-7、对照汕油523、汕油851的动态稳定性好,产量比较稳定。各参试品种均具有中等以上的抗病性、耐涝性、耐旱性、抗倒性及强生长势。因此,综合各品种农艺性状、生物学特性和品质,桂花026-10、汕油851、仲恺花1号、桂花026-7、粤油40可以进一步进行试验和推广应用。