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TZID:Asia/Jerusalem

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UID:1027@biology.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20211220T130000

DTEND;TZID=Asia/Jerusalem:20211220T140000

DTSTAMP:20211212T125810Z

URL:https://biology.technion.ac.il/en/seminars/dr-uria-alcombri-swiss-fede
 ral-institute-of-technology-zurich/

SUMMARY:Dr. Uria Alcombri\, Swiss Federal Institute of Technology\, Zurich 
 [No Categories]
DESCRIPTION:Location:   \n Affiliation: \n Host:\n Title: “Unravelling th
 e microscale mechanisms driving particle degradation in the ocean”Abstra
 ct: The sinking of organic particles to the ocean depths is the main drivi
 ng force of thebiological pump\, the process responsible for the export of
  more than 50 Gt of fixed CO2 annuallyand one of the major fluxes in the o
 ceans’ carbon cycle. Yet\, the mechanisms determining themagnitude of th
 e pump remain poorly understood\, limiting our ability to predict this car
 bon fluxin future ocean scenarios. Current ocean models assume that the bi
 ological pump is governed bythe competition between sinking speed and degr
 adation rate\, with the two processesindependent from one another. In this
  talk\, I will demonstrate that contrary to this paradigm\,sinking itself 
 is a primary determinant of the rate at which bacteria enzymatically degra
 departicles in the ocean. By combining video microscopy and microfluidic e
 xperiments to directlyobserve and quantify bacterial degradation of indivi
 dual organic particles in flow\, I will show thateven modest sinking speed
 s of 8 meters per day enhance degradation rates more than 10-fold. Iwill f
 urther discuss the molecular mechanism behind the sinking-enhanced degrada
 tion\, as wellas possible ways by which bacteria can slow the sinking of p
 articles. Finally\, using the resultsobtained from a mathematical model\, 
 I will show that the flow associated with sinking is a majorcontributor to
  the observed magnitude of the vertical carbon flux in the ocean\, and wil
 l outlinemajor open questions in the field. Host: Benjamin Podbilewicz 

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TZID:Asia/Jerusalem

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