María Cristina Di Gregori, María Aurelia Di Berardino (compiladoras), Conocimiento, realidad y relativismo

Fil: S��nchez García, Victoria. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

María Cristina Di Gregori, María Aurelia Di Berardino (compiladoras), Conocimiento, realidad y relativismo

Fil: S��nchez, Victoria. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C

Most deep ocean carbon flux profiles show low and almost constant fluxes of particulate organic carbon (POC) in the deep ocean. However, the reason for the non-changing POC fluxes at depths is unknown. This study presents direct measurements of formation, degradation, and sinking velocity of diatom aggregates from laboratory studies performed at 15 °C and 4 °C during a three-week experiment. The average carbon-specific respiration rate during the experiment was 0.12 ± 0.03 at 15 °C, and decreased 3.5-fold when the temperature was lowered to 4 °C. No direct influence of temperature on aggregate sinking speed was observed. Using the remineralisation rate measured at 4 °C and an average particle sinking speed of 150 m d**-1, calculated carbon fluxes were similar to those collected in deep ocean sediment traps from a global data set, indicating that temperature plays a major role for deep ocean fluxes of POC.

C.W. Post and Marjorie

On mat: D.H. Swartz, 600 Main Street, Fort Worth, Tex.

William C. Malley, 1890 University of Michigan football captain

Cropped from 1889 team photo.

Top Left: Mr. O.C. Sweetland. Top Right: Mrs. O.C. Sweetland. Bottom: Res. of O.C. Sweetland, Sec. 9, Lodi Tp. Michigan

Lodi Township (Mich.) residence. Publication information: Chicago, Ill. : Everts & Stewart, 1874.

Phares: France, côtes nord et ouest; Espagne et Portugal, côtes nord, ouest et sud-ouest ; Iles Açores, Madère et Canaries. Collationnés et corrigés au 1er mars 1901 par le Service des Instructions Nautiques...

At head of title: Etat-major général de la marine. Service hydrographique, série C, n° 218.

3ème [i.e., Troisième] quatuor : en La mineur, pour instruments à cordes. 1er et 2e violon, alto et violoncelle : oeuvre posthume /

Pl. no. A.C.9809.

Portraits of progress : Job Training Partnership Act.

Mode of access: Internet.

Roman portraits.

Text signed: Gisela M. A. Richter.

Betänkande angående gemensamt lönesystem samt lönereglering för postverket : telegrafverket, statens järnvägar och statens vattenfallsverk avgivet enligt det av Kungl. Maj: t den 28 juni 1918 lämnade uppdrag.

C. Ekman, ordförande; A. Hamilton, sekreterare.