Navigation Links
Toxic oceans may have delayed spread of complex life
Date:2/28/2013

A new model suggests that inhospitable hydrodgen-sulphide rich waters could have delayed the spread of complex life forms in ancient oceans. The research, published online this week in the journal Nature Communications, considers the composition of the oceans 550-700 million years ago and shows that oxygen-poor toxic conditions, which may have delayed the establishment of complex life, were controlled by the biological availability of nitrogen.

In contrast to modern oceans, data from ancient rocks indicates that the deep oceans of the early Earth contained little oxygen, and flipped between an iron-rich state and a toxic hydrogen-sulphide-rich state. The latter toxic sulphidic state is caused by bacteria that survive in low oxygen and low nitrate conditions. The study shows how bacteria using nitrate in their metabolism would have displaced the less energetically efficient bacteria that produce sulphide meaning that the presence of nitrate in the oceans prevented build-up of the toxic sulphidic state.

The model, developed by researchers at the University of Exeter in collaboration with Plymouth Marine Laboratory, University of Leeds, UCL (University College London) and the University of Southern Denmark, reveals the sensitivity of the early oceans to the global nitrogen cycle. It shows how the availability of nitrate, and feedbacks within the global nitrogen cycle, would have controlled the shifting of the oceans between the two oxygen-free states potentially restricting the spread of early complex life.

Dr Richard Boyle from the University of Exeter said: "Data from the modern ocean suggests that even in an oxygen-poor ocean, this apparent global-scale interchange between sulphidic and non-sulphidic conditions is difficult to achieve. We've shown here how feedbacks arising from the fact that life uses nitrate as both a nutrient, and in respiration, controlled the interchange between two ocean states. For as long as sulphidic condition
'/>"/>

Contact: Jo Bowler
j.bowler@exeter.ac.uk
44-013-927-22062
University of Exeter
Source:Eurekalert

Page: 1 2

Related biology news :

1. Is nanosilver toxic?
2. Nitrogen from pollution, natural sources causes growth of toxic algae, study finds
3. Scientists turn toxic by-product into biofuel booster
4. How our cells cope with toxic small molecules
5. Chemistry resolves toxic concerns about carbon nanotubes
6. Discovered! The new species of Borneos enigmatic primate with a toxic bite
7. Potentially toxic flame retardants found in many US couches
8. Scientists take objective look at terms least toxic pesticides applied as last resort
9. Colorful wall hangings contain toxic substances
10. Corals attacked by toxic seaweed use chemical 911 signals to summon help
11. Sweet new approach discovered to help produce metal casting parts, reduce toxicity
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/23/2014)... drought that has the entire country in its grip is ... also be responsible for the proliferation of a heat-loving amoeba ... and hot springs, which the drought has made warmer than ... of an infection caused by this parasite after swimming in ... nose of an individual and travels to the brain. Nose ...
(Date:7/23/2014)... The Worldwide Innovative Networking in personalized cancer medicine, ... Cancer Center at Thomas Jefferson University will ... only member of this prestigious group in the Tri-State ... delivery of innovative personalized medicine to the patient by ... advocacy. , "Our participation in the WIN consortium means ...
(Date:7/23/2014)... play an increasingly important role in carbon and nutrient ... expand, according to research published this week in the ... , University of British Columbia researchers plumbed the depth ... chart how microbial community metabolism changes as oxygen minimum ... picture of how SUP05 a bacterial group related ...
Breaking Biology News(10 mins):Diseases of another kind 2New partnership brings more personalized cancer treatment to Philadelphia 2Research charts the ecological impact of microbial respiration in the oxygen-starved ocean 2
... New Rochelle, NY, September 9, 2010A subset of ... associated with more illness and greater allergic hypersensitivity, ... Blood, and Lung Institute,s Severe Asthma Research Program ... Pediatric Allergy, Immunology, and Pulmonology , a ...
... The National Institutes of Health is launching two major ... curtail the nation,s childhood obesity epidemic. One will ... and the other will examine community efforts to reduce ... public health concern. If we don,t curb this widespread ...
... USDA Agriculture and Food Research Initiative (AFRI) grant will help ... gene system of sorghum will lead to enhanced bioenergy production ... we already know about and tailoring them to bioenergy uses ... professor of crop sciences and member of the Energy Biosciences ...
Cached Biology News:Research and insights on severe asthma in children 2NIH-funded studies aim to prevent, treat childhood obesity 2NIH-funded studies aim to prevent, treat childhood obesity 3U of I receives $1 million USDA grant to study Glossy15 in sorghum 2
(Date:7/23/2014)... the right people at the table for significant business ... achieving clinical and operational goals. The 22 nd ... 2014, in San Diego , featured ... discussing how partnerships have positively impacted their objectives. ... Officer of Cape Regional Medical Center located in ...
(Date:7/23/2014)... , July 23, 2014 ... portfolio company of Trendlines Agtech , announced ... Israel,s leading agricultural thermoplastics ... Valentis,s technology combines nanocrystalline cellulose (NCC), ... waste, with additional nanoparticles to produce highly improved ...
(Date:7/23/2014)... -- regulated information -- UCB today announced an important ... positive topline results from the latest Phase 3 ... to evaluate the efficacy and safety of ... compared to placebo, as adjunctive treatment in adult ... controlled despite treatment with one or two concomitant ...
(Date:7/23/2014)... July 23, 2014  Sofinnova Ventures, a ... the closing of Sofinnova Venture Partners IX, L.P. at ... of the initial fund target of $425 million. ... biotechnology companies. Consistent with recent funds, SVP IX will ... clinical programs, along with select investments in earlier stage ...
Breaking Biology Technology:MSC and Cape Regional Medical Center Partner to Improve Cost, Quality and Outcomes 2Valentis Nanotech Signs MOU to Integrate Technology in Thermoplastics Production 2Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 2Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 3Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 4Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 5Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 6Major advance in UCB pipeline: positive topline Phase 3 results for brivaracetam in epilepsy patients with partial-onset seizures 7Sofinnova Raises $500 Million Biotech Venture Fund 2
... - YM BioSciences Inc. (NYSE Alternext US:YMI, ... develops and commercializes differentiated products for patients ... clearance from Canadian regulatory authorities to initiate ... nimotuzumab, its EGFR-targeting antibody, in combination with ...
... Start of Q4 2008 , - Evaluation of strategic alternatives ... RoleSAN DIEGO, Jan. 5 ADVENTRX Pharmaceuticals, Inc. (NYSE Alternext ... reduction-in-force in an effort to extend its remaining cash and ... a reduction implemented in October 2008. In all, the ...
... Jan. 5 LightLab Imaging Inc. today,announced ... past year that are,the culmination of sustained ... These advances significantly increase the Company,s leadership,position ... OCT is a new,high-resolution, high-speed imaging ...
Cached Biology Technology:YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 2YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 3YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 4YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 5YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 6YM BIOSCIENCES RECEIVES CLEARANCE TO INITIATE RANDOMIZED DOUBLE-BLIND CLINICAL TRIALS OF NIMOTUZUMAB IN LUNG CANCER AND BRAIN METASTASES FROM LUNG CANCER 7ADVENTRX Announces Further Cost-Cutting Measures 2ADVENTRX Announces Further Cost-Cutting Measures 3ADVENTRX Announces Further Cost-Cutting Measures 4ADVENTRX Announces Further Cost-Cutting Measures 5LightLab Imaging Leads Global Advancement of Intracoronary Imaging 2LightLab Imaging Leads Global Advancement of Intracoronary Imaging 3
... Proteolytic degradation is critical to ... short-lived and regulatory proteins as important ... cellular metabolism, heat shock and stress ... surface receptors and ion channels, cell ...
... degradation is critical to the maintenance ... regulatory proteins as important and diverse ... heat shock and stress response, antigen ... and ion channels, cell cycle regulation, ...
... digital scanner serves as the spot-picking platform. ... standard rack positions on the tray, leaving ... plates on the remaining two racks.,The software ... by mouse-click on the scanned gel image. ...
...
Biology Products: