Seitenpfad:
  • Pres­se
  • Gre­go­ry J. Dick: The role of hy­dro­gen per­oxi­de in to­xi­ci­ty of cya­no­bac­te­ri­al blooms

Gre­go­ry J. Dick: The role of hy­dro­gen per­oxi­de in to­xi­ci­ty of cya­no­bac­te­ri­al blooms

10.08.2018
Bre­men

EINLADUNG

Frei­tag, 10. Au­gust 2018 
im neu­en Au­di­to­ri­um (4012), 14 Uhr

GREGORY J. DICK
Associate Professor and Associate Chair for Curriculum and Undergraduate Studies
Department of Earth & Environmental Sciences
University of Michigan

gibt ein Se­mi­nar mit dem Ti­tel:

The role of hydrogen peroxide in toxicity of cyanobacterial blooms

The role of hydrogen peroxide in toxicity of cyanobacterial blooms

The eu­tro­phi­ca­ti­on of lakes, re­ser­voirs and ri­vers world­wi­de has led to the pro­li­fe­ra­ti­on of to­xic cya­no­bac­te­ri­al blooms that threa­ten freshwa­ter eco­sys­tems, drin­king sup­p­lies, and hu­man health.  De­s­pi­te ra­pid pro­gress in un­der­stan­ding the bio­syn­the­tic and ge­ne­tic pa­thways for the­se cya­no­bac­te­ri­al to­xins, the eco­lo­gi­cal and en­vi­ron­men­tal dri­vers of to­xi­ci­ty re­main un­cle­ar.

Re­cent re­se­arch sug­gests that the phy­sio­lo­gi­cal pur­po­se of the mi­cro­cys­tin, a cya­no­to­xin pro­du­ced by the glo­bal­ly dis­tri­bu­ted cya­no­bac­te­ri­um Microcystis aeruginosa, is to pro­tect cya­no­bac­te­ri­al cells from oxi­da­ti­ve stress.  This se­mi­nar will fo­cus on stu­dies of the in­ter­play bet­ween Microcystis and hy­dro­gen per­oxi­de in the wes­tern ba­sin of Lake Erie, USA, whe­re Microcystis blooms oc­cur on a mas­si­ve sca­le an­nu­al­ly.  We find that hy­dro­gen per­oxi­de in sur­face wa­ters re­aches high con­cen­tra­ti­ons, suf­fi­ci­ent­ly high to ef­fect cya­no­bac­te­ri­al fit­ness, du­ring bloom de­ve­lop­ment due to bio­lo­gi­cal pro­duc­tion.

This en­vi­ron­men­tal hy­dro­gen per­oxi­de is this ra­pidly de­com­po­sed by he­te­ro­tro­phic bac­te­ria as­so­cia­ted with the bloom, sug­gesting im­portant in­ter­ac­tions bet­ween cya­no­bac­te­ria and as­so­cia­ted bac­te­ria.

This se­mi­nar will de­scri­be our ef­forts to di­sent­ang­le the sour­ces and sinks of H2O2 in cya­no­bac­te­ri­al blooms and its ef­fect on cya­no­bac­te­ri­al com­mu­ni­ty com­po­si­ti­on and func­tion.

NASA Earth Observatory image by Joshua Stevens, using Landsat data from the U.S. Geological Survey
NASA Earth Observatory image by Joshua Stevens, using Landsat data from the U.S. Geological Survey
Gregory J. Dick
Gregory J. Dick
 
 
Back to Top