Search results for: T REINHARD

Items from 1 to 20 out of 141 results

article

A sedimentary record of the evolution of the global marine phosphorus cycle

Noah J. Planavsky, Dan Asael, Alan D. Rooney, Leslie J. Robbins, more

Phosphorus (P) is typically considered to be the ultimate limiting nutrient for Earth's biosphere on geologic timescales. As P is monoisotopic, its sedimentary enrichment can provide some insights into how the marine P cycle has changed through time. A previous compilation of shale P enrichments argued for a significant change in P cycling during the Ediacaran Period (635–541 Ma). Here, using an updated...

article

River chemistry constraints on the carbon capture potential of surficial enhanced rock weathering

Shuang Zhang, Noah J. Planavsky, Joachim Katchinoff, Peter A. Raymond, more

Limnology and Oceanography > 67 > S2 > S148 - S157

Technologies and approaches that remove and sequester carbon dioxide (CO₂) from Earth's atmosphere are likely to play a significant role in mitigating anthropogenic climate disruption in the coming century. Enhanced rock weathering (ERW) on the land surface is one extensively discussed approach toward carbon dioxide removal (CDR), but the capacity of rivers to carry dissolved products derived from...

article

The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study

COVIDSurg Collaborative, Michel Adamina, Adesoji Ademuyiwa, Adewale Adisa, more

Colorectal Disease > 24 > 6 > 708 - 726

Aim The SARS‐CoV‐2 pandemic has provided a unique opportunity to explore the impact of surgical delays on cancer resectability. This study aimed to compare resectability for colorectal cancer patients undergoing delayed versus non‐delayed surgery. Methods This was an international prospective cohort study of consecutive colorectal cancer patients with a decision for curative surgery (January–April...

article

Microbial helpers allow cyanobacteria to thrive in ferruginous waters

Nadia Szeinbaum, Yael J. Toporek, Christopher T. Reinhard, Jennifer B. Glass

Geobiology > 19 > 5 > 510 - 520

The Great Oxidation Event (GOE) was a rapid accumulation of oxygen in the atmosphere as a result of the photosynthetic activity of cyanobacteria. This accumulation reflected the pervasiveness of O₂ on the planet's surface, indicating that cyanobacteria had become ecologically successful in Archean oceans. Micromolar concentrations of Fe²⁺ in Archean oceans would have reacted with hydrogen peroxide,...

article

Head and neck cancer surgery during the COVID‐19 pandemic: An international, multicenter, observational cohort study

COVIDSurg Collaborative, Richard Shaw, Stuart C Winter, James Glasbey, more

Cancer > 127 > 14 > 2476 - 2488

Background The aims of this study were to provide data on the safety of head and neck cancer surgery currently being undertaken during the coronavirus disease 2019 (COVID‐19) pandemic. Methods This international, observational cohort study comprised 1137 consecutive patients with head and neck cancer undergoing primary surgery with curative intent in 26 countries. Factors associated with severe...

article

Outcomes from elective colorectal cancer surgery during the SARS‐CoV‐2 pandemic

COVIDSurg Collaborative, James C. Glasbey, Dmitri Nepogodiev, Joana F. F. Simoes, more

Colorectal Disease > 23 > 3 > 732 - 749

Aim This study aimed to describe the change in surgical practice and the impact of SARS‐CoV‐2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS‐CoV‐2 pandemic. Method This was an international cohort study of patients undergoing elective resection of colon or rectal cancer without preoperative suspicion of SARS‐CoV‐2. Centres entered data from their...

article

Delaying surgery for patients with a previous SARS‐CoV‐2 infection

COVIDSurg Collaborative, James C Glasbey, Dmitri Nepogodiev, Omar Omar, more

British Journal of Surgery > 107 > 12 > e601 - e602

article

On the co‐evolution of surface oxygen levels and animals

Devon B. Cole, Daniel B. Mills, Douglas H. Erwin, Erik A. Sperling, more

Geobiology > 18 > 3 > 260 - 281

Few topics in geobiology have been as extensively debated as the role of Earth's oxygenation in controlling when and why animals emerged and diversified. All currently described animals require oxygen for at least a portion of their life cycle. Therefore, the transition to an oxygenated planet was a prerequisite for the emergence of animals. Yet, our understanding of Earth's oxygenation and the environmental...

article

The impact of marine nutrient abundance on early eukaryotic ecosystems

Christopher T. Reinhard, Noah J. Planavsky, Ben A. Ward, Gordon D. Love, more

Geobiology > 18 > 2 > 139 - 151

The rise of eukaryotes to ecological prominence represents one of the most dramatic shifts in the history of Earth's biosphere. However, there is an enigmatic temporal lag between the emergence of eukaryotic organisms in the fossil record and their much later ecological expansion. In parallel, there is evidence for a secular increase in the availability of the key macronutrient phosphorus (P) in Earth's...

article

A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic

David Auerbach Colwyn, Nathan D. Sheldon, J. Barry Maynard, Robert Gaines, more

Geobiology > 17 > 6 > 579 - 593

Atmospheric oxygen levels control the oxidative side of key biogeochemical cycles and place limits on the development of high‐energy metabolisms. Understanding Earth's oxygenation is thus critical to developing a clearer picture of Earth's long‐term evolution. However, there is currently vigorous debate about even basic aspects of the timing and pattern of the rise of oxygen. Chemical weathering in...

article

Intraocular pressure measurement with Corvis ST in comparison with applanation tonometry and Tomey non-contact tonometry

Jan Luebke, L. Bryniok, M. Neuburger, J. F. Jordan, more

International Ophthalmology > 2019 > 39 > 11 > 2517-2521

Purpose Intraocular pressure (IOP) measurement can be performed with different methods. Newer methods have to be compared to the standard method, the Goldmann applanation tonometry (GAT). We herein compare two air-puff tonometers, the non-contact tonometer (Tomey NCT) and the Corvis ST (CST) with GAT in eyes with a broad spectrum of IOP. Methods Two hundred and forty-nine eyes of 249 patients (with...

article

Skleraeinschmelzung nach Zyklophotokoagulation

C. Evers, J. F. Jordan, T. Reinhard, P. Maier, more

Der Ophthalmologe > 2019 > 116 > 11 > 1071-1073

Wir berichten von einer Skleraeinschmelzung als sehr seltene, aber schwerwiegende Komplikation einer transskleralen Zyklophotokoagulation. Der Gewebedefekt ließ sich mit einer tektonischen Minikeratoplastik erfolgreich decken.

article

Zeiterfassung in ophthalmologischen klinischen Studien. Eine multizentrische Feldstudie

D. Böhringer, D. Goos, T. Ach, N. Feltgen, more

Der Ophthalmologe > 2019 > 116 > 9 > 872-878

Hintergrund In klinischen Studien bestehen im Vergleich zur klinischen Routine höhere Anforderungen, was einen zeitlichen Mehraufwand bedingt. Ziel dieser Arbeit ist die vollumfängliche Zeiterfassung an den deutschen ophthalmologischen Studienzentren. Methoden Mit 3 Fragebögen wurden bei den Mitgliedern der „Arbeitsgemeinschaft DOG Klinische Studienzentren“ der geschätzte Zeitaufwand für die studienbezogenen...

article

A sluggish mid‐Proterozoic biosphere and its effect on Earth's redox balance

Kazumi Ozaki, Christopher T. Reinhard, Eiichi Tajika

Geobiology > 17 > 1 > 3 - 11

The possibility of low but nontrivial atmospheric oxygen (O₂) levels during the mid‐Proterozoic (between 1.8 and 0.8 billion years ago, Ga) has important ramifications for understanding Earth's O₂ cycle, the evolution of complex life and evolving climate stability. However, the regulatory mechanisms and redox fluxes required to stabilize these O₂ levels in the face of continued biological oxygen production...

article

Pathogenese, Diagnose und Klinik der Fuchs-Endotheldystrophie

K. Wacker, T. Reinhard, P. Maier

Der Ophthalmologe > 2019 > 116 > 3 > 221-227

Hintergrund In den letzten Jahren wurde die Therapie der Fuchs-Endotheldystrophie rasch weiterentwickelt. Mit besserem Verständnis zu optischen und morphologischen Veränderungen muss auch die Diagnostik im Hinblick auf die Indikationsstellung zur Keratoplastik neu durchdacht werden. Material und Methoden Diese Arbeit fasst die aktuellen Erkenntnisse zur Fuchs-Endotheldystrophie für Kliniker und...

article

Nitrous oxide from chemodenitrification: A possible missing link in the Proterozoic greenhouse and the evolution of aerobic respiration

Chloe L. Stanton, Christopher T. Reinhard, James F. Kasting, Nathaniel E. Ostrom, more

Geobiology > 16 > 6 > 597 - 609

The potent greenhouse gas nitrous oxide (N₂O) may have been an important constituent of Earth's atmosphere during Proterozoic (~2.5–0.5 Ga). Here, we tested the hypothesis that chemodenitrification, the rapid reduction of nitric oxide by ferrous iron, would have enhanced the flux of N₂O from ferruginous Proterozoic seas. We empirically derived a rate law,

\frac{d (N_{2}, O)}{d t} = 7.2 \times 10^{- 5} {[{Fe}^{2 +}]}^{0.3} {[NO]}^{1}

, and measured...

article

A Mesoarchean shift in uranium isotope systematics

Xiangli Wang, Noah J. Planavsky, Axel Hofmann, Erin E. Saupe, more

Geochimica et Cosmochimica Acta > 2018 > 238 > C > 438-452

Oxygenic photosynthesis fundamentally transformed all major biogeochemical cycles and increased the size and complexity of Earth's biosphere. However, there is still debate about when this metabolism evolved. As oxygenic photosynthesis is the only significant source of O₂ at Earth’s surface, O₂-sensitive trace element enrichments and isotopic signatures in Archean sedimentary rocks can potentially...

article

Erratum zu: Gute fachliche Praxis zur Gewinnung und Herstellung von kryokonservierter humaner Amnionmembran aus Spenderplazenta

H. Thomasen, J. Schroeter, T. Reinhard, B. Seitz, more

Der Ophthalmologe > 2018 > 115 > 10 > 892-892

Erratum zu:Ophthalmologe (2017) https://doi.org/10.1007/s00347-017-0626-4 Sehr geehrte Leserin,sehr geehrter Leser,die zunächst veröffentlichte Onlineversion dieses Artikels war leider unvollständig, bei der in Kap. 8. Kontamination dargestellten Referenzliste fehlte der Punkt „sämtliche …

article

Tracking the rise of eukaryotes to ecological dominance with zinc isotopes

Terry T. Isson, Gordon D. Love, Christopher L. Dupont, Christopher T. Reinhard, more

Geobiology > 16 > 4 > 341 - 352

The biogeochemical cycling of zinc (Zn) is intimately coupled with organic carbon in the ocean. Based on an extensive new sedimentary Zn isotope record across Earth's history, we provide evidence for a fundamental shift in the marine Zn cycle ~800 million years ago. We discuss a wide range of potential drivers for this transition and propose that, within available constraints, a restructuring of marine...

article

Bleb-related infections and long-term follow-up after trabeculectomy

J. Luebke, M. Neuburger, J. F. Jordan, T. Wecker, more

International Ophthalmology > 2019 > 39 > 3 > 571-577

Purpose Bleb-related infections are serious complications after trabeculectomy. They can be limited to the bleb or disseminate and lead to endophthalmitis. We herein report on all bleb-related infections that have been diagnosed at the Eye Center of the University of Freiburg, Germany, since 1999. Methods We reviewed a total of 1816 consecutive trabeculectomies that were performed at our hospital...

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KERATOPLASTIK (14)
KERATOPLASTY (13)
CORNEA (11)
PERFORIERENDE KERATOPLASTIK (11)
PENETRATING KERATOPLASTY (10)
HORNHAUT (7)
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INFONA - science communication portal

Search results for: T REINHARD

A sedimentary record of the evolution of the global marine phosphorus cycle

River chemistry constraints on the carbon capture potential of surficial enhanced rock weathering

The impact of surgical delay on resectability of colorectal cancer: An international prospective cohort study

Microbial helpers allow cyanobacteria to thrive in ferruginous waters

Head and neck cancer surgery during the COVID‐19 pandemic: An international, multicenter, observational cohort study

Outcomes from elective colorectal cancer surgery during the SARS‐CoV‐2 pandemic

Delaying surgery for patients with a previous SARS‐CoV‐2 infection

On the co‐evolution of surface oxygen levels and animals

The impact of marine nutrient abundance on early eukaryotic ecosystems

A paleosol record of the evolution of Cr redox cycling and evidence for an increase in atmospheric oxygen during the Neoproterozoic

Intraocular pressure measurement with Corvis ST in comparison with applanation tonometry and Tomey non-contact tonometry

Skleraeinschmelzung nach Zyklophotokoagulation

Zeiterfassung in ophthalmologischen klinischen Studien. Eine multizentrische Feldstudie

A sluggish mid‐Proterozoic biosphere and its effect on Earth's redox balance

Pathogenese, Diagnose und Klinik der Fuchs-Endotheldystrophie

Nitrous oxide from chemodenitrification: A possible missing link in the Proterozoic greenhouse and the evolution of aerobic respiration

A Mesoarchean shift in uranium isotope systematics

Erratum zu: Gute fachliche Praxis zur Gewinnung und Herstellung von kryokonservierter humaner Amnionmembran aus Spenderplazenta

Tracking the rise of eukaryotes to ecological dominance with zinc isotopes

Bleb-related infections and long-term follow-up after trabeculectomy

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