Evidence of chromosomal damage in common eiders (Somateria mollissima) from the Baltic Sea

Common eiders nesting in the Baltic Sea are exposed to generally high levels of contaminants including potentially genotoxic polycyclic aromatic hydrocarbons and organochlorines. Blood samples were collected from eiders at eight sites in the Baltic Sea and two sites in the Beaufort Sea. DNA content variation was estimated using the flow cytometric method, and subsequently utilized as a biomarker of genetic damage. We observed no significant differences in genetic damage among populations within either the Baltic or Beaufort Seas. However, eider populations from the Baltic Sea had significantly elevated estimates of genetic damage compared to populations from the Beaufort Sea.     

Hydraulics of recirculating well pairs for ground water remediation

Recirculating well pairs are a proven means of implementing bioremediation and may also be useful for applying other in situ ground water remediation technologies. A bromide tracer test was performed to characterize the hydraulic performance of a recirculating well pair installed at Moffett Field, California. In particular, we estimate two important properties of the recirculating well pair: (1) the fraction of captured water that is recycled between the wells, and (2) the travel-time distribution of ground water in the induced zone of recirculation. We also develop theoretical estimates of these two properties and demonstrate they depend upon a dimensionless pumping rate, denoted xi. The bromide breakthrough curve predicted from theory agrees well with that determined experimentally at Moffett Field. The minimum travel time between the wells is denoted t(min). In theory, t(min) depends inversely on Q, the pumping rate in the recirculating wells, and is proportional to a2, the square of the distance between the wells. Both the experimental and theoretical travel-time distributions indicate that at least half the recirculating water travels between the wells along fast flowpaths (travel time < 2*t(min)). Therefore, when designing recirculating well pairs, engineers should ensure that t(min) will be sufficiently high to allow biologically mediated reactions (or other in situ remediation processes) sufficient time to proceed.     

Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling

~~Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling1)Present address:Max-Planck-Institut f..Chemie,Postfach3060,55020Mainz,Germany.~~     

On the siltation of the middle Yangtze River

1 Origin, process and method of the research Silt deposition created the fertile Dongting and Jianghan Plains of the middle Yangtze drainage, but has become a main cause of the deteriorating flooding along the middle Yangtze. The history of flood and waterlog of the Yangtze River in last century, esp. the disastrous 1998 flood, has proved that the key to the Yangtze flood control is its middle reach, especially the Jingjiang Segment. To study the silt deposition of the middle Yangtze and …     

Ultrahigh pressure (>7 GPa) gneissic K-feldspar (-bearing) garnet clinopyroxenite in the Altyn Tagh, NW China: Evi- dence from clinopyroxene exsolution in garnet

Since the ultra-high pressure metamorphic rocks with coesite and diamond indicators,which are formed under the condition of deep-subduction of continental crust,have been recognized[1―4],exsolution structures of the ultra-high pressure minerals such as pyroxene,olivine,garnet and sphene in the various kinds of rocks have attracted the great interests and attention of many researchers[5―18].Some exsolution structures,such as clinopyroxene+rutile+apatite[13]or quartz+rutile+apatite[15]exsolutio…     

Characteristics of Recent Horizontal Crustal Movement and Tectonic Deformation in the Northwest China Region

INTRODUCTIONThe vector diagramof the crustal horizontal movement of the north margin of Qinghai-Xizang(Tibet) block obtained from GPS measurements of 2001 ~2003 shows that the western part of theregion presents a southwestward movement oppositetothetrend beforethe Nov.14 ,2001 west KunlunMountains PassMS8 .1 earthquake ,which mayreflectthe post-earthquake relaxationand adjustment ofthe region (Zhang Xi ,2004) .It was the variation of regional dynamics that led to instability of thepo…     

Iron, calcite, and oxidative stress in coal dust-induced lung diseases

Backgrounds： Coal is and will remain a major energy resource worldwide with P.R. China and the U.S. the leading producers. It has long been known that coal mining causes health problems such as coal workers＇ pneumoconiosis （CWP） and chronic obstructive pulmonary disease （e.g., emphysema）. Yet, there are no accurate methods for predicting their occurrence. The goals of the present study are to determine whether bioavailable iron （BAI） is the active component in coal dust-induced lung diseases and to develop a model using BAI for the prediction of coal＇s pneumoconiotic potency. Methods： Thirty coal samples from Utah （UT）, West Virginia （WV） and Pennsylvania （PA） coalmine regions with a low, moderate, and high prevalence of CWP, respectively,     

SOME REGULARITIES OF HEAVY RAIN IN XINJIANG,CHINA

The paper studied the distribution law of Xinjiang's heavy rain in time-area-depth bytheoretical expression deduced from the entropy maximum principle and found some regularities ofheavy rainfall in Xinjiang based on analyzing 32-year observational data from about 400hydrological and meteorological stations.It has practical significance for studying Xinjiang's heavyrainfall,designing water conservancy and reducing flood catastrophe caused by heavy rain.     

Abrupt change of winter temperature over the Mongolian Plateau during 1961-2017

Studying the abrupt change of winter temperature(ACWT) over the Mongolian Plateau(MP, including Inner Mongolia Autonomous Region and State of Mongolia) is of great significance for understanding the spatiotemporal distribution of temperature and the mechanism of global climate change. Monthly temperature data during 1961–2017was collected, and the abrupt change point was determined by the Mann–Kendall test and sliding ttest, to analyze the characteristics and causes of ACWT. The results showed t...     

Crustal growth and reworking at Archean plate margins

<正>1.Introduction Archean cratons have attained and maintained long-term stability, and they are the main area for studying the geological processes and tectonic regime of early Earth. The majority of cratons have completed their cratonization through growth and assemblage of ancient continental nuclei in the late Archean(Cawood et al., 2018; Zeh and Kirchenbaur, 2022).