栉孔扇贝不同种群杂交效果的研究 Ⅱ.中国种群和俄罗斯种群及其杂种F₁中期生长发育   总被引：1，自引：1，他引：1  

刘小林  常亚青  相建海  李富花  刘宪杰  BROVKINA Elena Pavlovna 《海洋学报》2005,27(2):135-140

在对栉孔扇贝中国养殖种群(CC)、中国野生种群(CW)和俄罗斯种群(RW)及其3 种杂交种群早期(2,3,4月龄)生长发育研究的基础上进行了各种群的中期(6,8,10,12月龄)生长发育测定比较研究,结果表明,3个亲本群体各个性状的中期生长性能表现以中国养殖种群最好;3个杂交组合的杂种群体各个性状的中期生长性能均高于纯种亲本种群,杂种优势均较大,其范围在3%~52%,以CC♀×RW♂杂交效果最好;壳长、壳宽、壳高、活体重在4个生长发育指标中期的4 个阶段均表现出不同程度的杂种优势,杂种优势在性状间存在明显差别,体重的杂种优势远大于壳宽、壳长和壳高的,变化趋势为体重大于壳宽,壳宽大于壳长,壳长大于壳高;季节性变化因素对栉孔扇贝各个性状的生长速度影响非常大,6~8月龄处于冬季最寒冷的时间(11月份至翌年3月份),扇贝越冬期间仅能维持生命,生长率接近于0,温暖季节如6月龄(11月)以前和8月龄(3月份)以后各性状的生长速度提高幅度很大.  相似文献   

Millennium scale environment changes of the Okhotsk Sea during last 80 kyr and their phase relationship with global climate changes     

Sergey Alexandrovich Gorbarenko  Evgenia L’vovich Goldberg  Michaele Kashgarian  Tat’yana Alekseevna Velivetskaya  Sergey Petrovich Zakharkov  Vladimir Stepanovich Pechnikov  Alexandr Anatol’evich Bosin  Olga Yur’evna Psheneva  Elena Diamilevna Ivanova 《Journal of Oceanography》2007,63(4):609-623

The paper presents the records of several paleoproductivity proxies (PP) (biogenic opal and Ba (Si_bio, Ba_bio), organic carbon (C_org) and carbonate Ca_carb, chlorin and benthic foraminifera abundance (BFA)) in sediments of the Okhotsk Sea for the last 80 kyr with a resolution of ∼100–300 years. The sediment age model was based on the AMS ¹⁴C data, records of benthic foraminifera δ¹⁸O, paleointensity of the Earth’s geomagnetic field and magnetic susceptibility. PP values demonstrate series of severe prolonged productivity drops in the Okhotsk Sea followed by a sharp increase during the last glaciation. On the basis of quantitative estimations of the paleoproductivity in the Okhotsk Sea during the cold MIS 2 and warm Holocene (Gorbarenko and Goldberg, 2005), it is suggested that the millennium scale relationship in productivity-climate changes of this basin was similar: an increase in the sea’s productivity was related with regional climate warming and vice-versa. The PP records of productivity/climate oscillations in the Okhotsk Sea during MIS 2–4 occurred contemporaneously with the North Atlantic cold Heinrich events (HE) and Greenland Dansgaard-Oyeshger interstadial (DOI). Observed successions of prolonged climate cooling events followed by rapid, abrupt warming are similar to climate and environmental oscillations in the N. Atlantic and Greenland, that confirms the millennium-scale climate changes synchronicities in the Northern Hemisphere including the far NW Pacific, the hydrology and climate conditions of which are close to those of the Okhotsk Sea. Synchronism of the N. Hemisphere severe cooling (including the Okhotsk Sea) with the Antarctic warming suggests that mechanisms of the “seesaw” effect (Blunier and Brook, 2001) in the low latitude heat redistribution between high latitudes of both hemispheres were more complicated than direct NADW formation forcing and encompasses the global atmospheric reorganization. Within the PP used a closer connection in the Okhotsk Sea millennium oscillations was observed for the C_org, BFA and chlorin; Ba_bio increases more closely to DOI. Si_bio variability does not show any evident correlation with productivity changes.  相似文献   

On some characteristics of ionospheric disturbances at Genova,Italy     

M. Bossolasco  A. Elena 《Pure and Applied Geophysics》1962,53(1):81-87

Summary Ionospheric disturbances recorded at Genova are studied in relation to the corresponding geomagnetic disturbances. Storm time and disturbance daily variation are derived, as well as some characteristic features of ionospheric perturbations. Generally these perturbations are dealyed with respect to the corresponding geomagnetic disturbances: the mean time-lag referred to the whole day is of the order of 1h30m, but if thessc occurs in the morning or near noon the mean time-lag is nearly of 4h.The main results of this paper have been presented at the Symposium on Ionospheric Soundings in the IGY-IGC, held in Nice, France, on 11–16 December 1961 (and organized by the CIG-Committee of the URSI).  相似文献   

Erratum to: Ionisation Equilibrium for the Non-Maxwellian Electron n$n$-Distributions in Solar Flares: Updated Calculations     

Elena Dzifčáková  Jaroslav Dudík 《Solar physics》2016,291(2):729-729

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Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review)     

Tom Van Doorsselaere  Elena G. Kupriyanova  Ding Yuan 《Solar physics》2016,291(11):3143-3164

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Geology,permafrost, and lake level changes as factors initiating landslides on Olkhon Island (Lake Baikal,Siberia)     

Sebastian Tyszkowski  Halina Kaczmarek  Michał Słowiński  Elena Kozyreva  Dariusz Brykała  Artiom Rybchenko  Viktoria A. Babicheva 《Landslides》2015,12(3):573-583

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Semi-automated regional classification of the style of activity of slow rock-slope deformations using PS InSAR and SqueeSAR velocity data     

Crippa  Chiara  Valbuzzi  Elena  Frattini  Paolo  Crosta  Giovanni B.  Spreafico  Margherita C.  Agliardi  Federico 《Landslides》2021,18(7):2445-2463

Large slow rock-slope deformations, including deep-seated gravitational slope deformations and large landslides, are widespread in alpine environments. They develop over thousands of years by progressive failure, resulting in slow movements that impact infrastructures and can eventually evolve into catastrophic rockslides. A robust characterization of their style of activity is thus required in a risk management perspective. We combine an original inventory of slow rock-slope deformations with different PS-InSAR and SqueeSAR datasets to develop a novel, semi-automated approach to characterize and classify 208 slow rock-slope deformations in Lombardia (Italian Central Alps) based on their displacement rate, kinematics, heterogeneity and morphometric expression. Through a peak analysis of displacement rate distributions, we characterize the segmentation of mapped landslides and highlight the occurrence of nested sectors with differential activity and displacement rates. Combining 2D decomposition of InSAR velocity vectors and machine learning classification, we develop an automatic approach to characterize the kinematics of each landslide. Then, we sequentially combine principal component and K-medoids cluster analyses to identify groups of slow rock-slope deformations with consistent styles of activity. Our methodology is readily applicable to different landslide datasets and provides an objective and cost-effective support to land planning and the prioritization of local-scale studies aimed at granting safety and infrastructure integrity.

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Nanoscale Chemical Imaging by Photo‐Induced Force Microscopy: Technical Aspects and Application to the Geosciences     

Laura M. Otter  Michael W. Frster  Elena Belousova  Padraic O&#x;Reilly  Derek Nowak  Sung Park  Simon Clark  Stephen F. Foley  Dorrit E. Jacob 《Geostandards and Geoanalytical Research》2021,45(1):5-27

Photo‐induced force microscopy (PiFM) is a new‐frontier technique that combines the advantages of atomic force microscopy with infrared spectroscopy and allows for the simultaneous acquisition of 3D topographic data with molecular chemical information at high spatial (~ 5 nm) and spectral (~ 1 cm^?1) resolution at the nanoscale. This non‐destructive technique is time efficient as it requires only conventional mirror‐polishing and has fast mapping rates on the order of a few minutes that allow the study of dynamic processes via time series. Here, we review the method’s historical development, working principle, data acquisition, and evaluation, and provide a comparison with traditional geochemical methods. We review PiFM studies in the areas of materials science, chemistry and biology. In addition, we provide the first applications for geochemical samples including the visualization of faint growth zonation in zircons, the identification of fluid speciation in high‐pressure experimental samples, and of nanoscale organic phases in biominerals. We demonstrate that PiFM analysis is a time‐ and cost‐efficient technique combining high‐resolution surface imaging with molecular chemical information at the nanoscale and, thus, complements and expands traditional geochemical methods.  相似文献   

Growth of chloritoid and garnet along a nearly isothermal burial path to 70 km depth: an example from the Bughea Metamorphic Complex,Leaota Massif,South Carpathians     

Negulescu  Elena  Săbău  Gavril  Massonne  Hans-Joachim 《Mineralogy and Petrology》2018,112(4):535-553

Mineralogy and Petrology - Chloritoid-bearing micaschist occurs in the matrix of a subduction mélange (Bughea Complex) of the Leaota Massif (South Carpathians) containing blocks of...  相似文献   

Spatio-temporal analysis of flowering using LiDAR topography     

Samantha Hart  Elena Mikhailova  Christopher Post  Patrick McMillan  Julia Sharp  William Bridges 《地理学报(英文版)》2017,27(1):62-78

Spatio-temporal patterns of flowering in forest ecosystems are hard to quantify and monitor. The objectives of this study were to investigate spatio-temporal patterns(e.g. soilssimple slope classesslope aspectand flow accumulation) of flowering around Lake IssaqueenaSouth Carolina(SCUSA) using plant-flowering database collected with GPS- enabled camera(stored in Picasa 3 web albums and project website) on a monthly basis in 2012 and Li DAR-based topography. Pacolet fine sandy loam had the most flowering plantsfollowed by Madison sandy loamboth dominant soil types around the lake. Most flowering plants were on moderately steep(17%–30%) and gently sloping(4%–8%) slopes. Most flowering plants were on west(247.5°–292.5°)southwest(202.5°–247.5°)and northwest(292.5°–337.5°) aspects. Most flowering plants were associated with minimum and maximum flows within the landscape. Chi-square tests indicated differences in the distributions of the proportions of flowering plants were significant by soil typeslopeaspectand flow accumulation for each month(February-November)for all months(overall)and across months. The Chi-square test on area-normalized data indicated significant differences for all months and individual differences by each month with some months not statistically significant. Cluster analysis on flowering counts for nine plant families with the most flowering counts indicated no unique separation by clusterbut implied that the majority of these families were flowering on strongly sloping(9%–16%) slopeson southwest(202.5°–247.5°) aspectsand low flow accumulation(0–200). Presented methodology can serve as a template for future efforts to quantify spatio-temporal patterns of flowering and other phenological events.  相似文献