toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author de Castellvi, J (ed) openurl 
  Title Actas des tercer symposium espanol de estudios Antarcticos. Gredos, 3 al 5 de octubre de 1989 Type Book Whole
  Year 1990 Publication Abbreviated Journal  
  Volume Issue Pages 379 pp  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Comision interministerial de Cienctia y Technologia Place of Publication Madrid Editor de Castellvi, J  
  Language Spanish Summary Language Original Title  
  Series Editor (up) Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number refbase @ user @ library-32/19/20 Serial 9  
Permanent link to this record
 

 
Author Bischof, K; Peralta, G; Kräbs, G; van de Poll, WH; Perez-Llorens, JL; Breeman, AM url  doi
openurl 
  Title Effects of solar UV-B radiation on canopy structure of Ulva communities from southern Spain Type Journal Article
  Year 2002 Publication Journal of Experimental Botany Abbreviated Journal J Exp Bot  
  Volume 53 Issue 379 Pages 2411-2421  
  Keywords canopy formation; photosynthesis; ultraviolet radiation; Ulva rotundata  
  Abstract Within the sheltered creeks of Cádiz bay, Ulva thalli form extended mat-like canopies. The effect of solar ultraviolet radiation on photosynthetic activity, the composition of photosynthetic and xanthophyll cycle pigments, and the amount of RubisCO, chaperonin 60 (CPN 60), and the induction of DNA damage in Ulva aff. rotundata Bliding from southern Spain was assessed in the field. Samples collected from the natural community were covered by screening filters, generating different radiation conditions. During daily cycles, individual thalli showed photoinhibitory effects of the natural solar radiation. This inhibition was even more pronounced in samples only exposed to photosynthetically active radiation (PAR). Strongly increased heat dissipation in these samples indicated the activity of regulatory mechanisms involved in dynamic photoinhibition. Adverse effects of UV-B radiation on photosynthesis were only observed in combination with high levels of PAR, indicating the synergistic effects of the two wavelength ranges. In samples exposed either to PAR+UV-A or to UV-B+UV-A without PAR, no inhibition of photosynthetic quantum yield was found in the course of the day. At the natural site, the top layer of the mat-like canopies is generally completely bleached. Artificially designed Ulva canopies exhibited fast bleaching of the top layer under the natural solar radiation conditions, while this was not observed in canopies either shielded from UV or from PAR. The bleached first layer of the canopies acts as a selective UV-B filter, and thus prevents subcanopy thalli from exposure to harmful radiation. This was confirmed by the differences in photosynthetic activity, pigment composition, and the concentration of RubisCO in thalli with different positions within the canopy. In addition, the induction of the stress protein CPN 60 under UV exposure and the low accumulation of DNA damage indicate the presence of physiological protection mechanisms against harmful UV-B. A mechanism of UV-B-induced inhibition of photosynthesis under field conditions is proposed.  
  Address  
  Corporate Author Thesis  
  Publisher Oxford University Press Place of Publication Editor  
  Language English Summary Language English Original Title  
  Series Editor (up) Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area southern Spain Expedition Conference  
  Notes Approved no  
  Call Number refbase @ user @ Serial 12  
Permanent link to this record
 

 
Author Amon, RMW; Budéus, G; Meon, B url  doi
openurl 
  Title Dissolved organic carbon distribution and origin in the Nordic Seas: Exchanges with the Arctic Ocean and the North Atlantic Type Journal Article
  Year 2003 Publication Journal of Geophysical Research Abbreviated Journal J Geophys Res  
  Volume 108 Issue C7 Pages  
  Keywords dissolved organic matter; dissolved organic carbon; chromophoric dissolved organic matter; fluorescence; vertical carbon transport  
  Abstract Dissolved organic carbon (DOC) and in situ fluorescence were measured along with hydrographic parameters in the Greenland, Iceland, and Norwegian Seas (Nordic Seas). Surface (<100 m) concentrations of DOC ranged from 60 to 118 µM with elevated values in the East Greenland Current (EGC) which transports water from the Arctic Ocean to the North Atlantic. EGC surface waters also showed a pronounced fluorescence maximum between 30 and 120 m depth in all EGC sections indicating the abundance of Arctic river derived DOC in this current. Based on fluorescence we estimated that 20-50% of the annual river discharge to the Arctic Ocean was exported in the EGC. The fluorescence maximum was typically associated with salinity around 33 and temperatures below -1°C which are characteristic of surface and upper halocline water in the Arctic Ocean. The elevated fluorescence in this water mass suggests a strong Eurasian shelf component and also suggests that in situ fluorescence could be used to trace Eurasian shelf water in the central Arctic Ocean. DOC concentrations in the Nordic Sea basins (>1000 m) were relatively high (~50 µM DOC) compared with other ocean basins indicating active vertical transport of DOC in this region on decadal timescales. Based on existing vertical transport estimates and 15 µM of semilabile DOC we calculated an annual vertical net DOC export of 3.5 Tg C yr-1 in the Greenland Sea and about 36 Tg C yr-1 for the entire Arctic Mediterranean Sea (AMS) including the Greenland-Scotland Ridge overflow. It appears that physical processes play a determining role for the distribution of DOC in the AMS.  
  Address  
  Corporate Author Thesis  
  Publisher American Geophysical Union Place of Publication Washington, DC Editor  
  Language English Summary Language English Original Title  
  Series Editor (up) Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Nordic Seas Expedition Conference  
  Notes Approved no  
  Call Number refbase @ user @ ms Serial 5  
Permanent link to this record
 

 
Author Kahn, E. url  openurl
  Title Conducting Type Book Whole
  Year 1966 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher New York: Free P., 1966 Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor (up) Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes 12, 244 S Approved no  
  Call Number refbase @ admin @ Serial 13  
Permanent link to this record
 

 
Author MacElheran, B. url  isbn
openurl 
  Title Conducting technique : for beginners and professionals Type Book Whole
  Year 1989 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher New York [u.a.]: Oxford Univ. Press, 1989 Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor (up) Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 0193858304 Medium  
  Area Expedition Conference  
  Notes Rev. ed; XIV, 134 S : graph. Darst., Noten Approved no  
  Call Number refbase @ admin @ Serial 15  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: