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Book ; Online: Geochemistry on Holocene sediments from the Mediterranean, supplementary data to: M?bius, J?rgen; Lahajnar, Niko; Emeis, Kay-Christian (2010): Diagenetic control of nitrogen isotope ratios in Holocene sapropels and recent sediments from the Eastern Mediterranean Sea. Biogeosciences, 7, 3901-3914

M?bius, J?rgen / Emeis, Kay-Christian / Lahajnar, Niko

2011

Abstract: The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to ... ...

Abstract	The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and d15N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10-6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in d15N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and d15N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation.
Language	English
Dates of publication	2011-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to doi:10.5194/bg-7-3901-2010
DOI	10.1594/PANGAEA.758621
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Online: The sapropel record of the eastern Mediterranean Sea, supplementary data to: Emeis, Kay-Christian; Sakamoto, Tatsuhiko; Wehausen, Rolf; Brumsack, Hans-J?rgen (2000): The sapropel record of the eastern Mediterranean Sea - results of Ocean Drilling Program Leg 160. Palaeogeography, Palaeoclimatology, Palaeoecology, 158(3-4), 371-395

Emeis, Kay-Christian / Brumsack, Hans-J?rgen / Sakamoto, Tatsuhiko / Wehausen, Rolf

2000

Abstract: Research on sediments recovered during Ocean Drilling Leg 160 has concentrated on two issues: the first concerned the stratigraphy of sapropel formation, the second was oriented to clarify specific processes that explain sapropel origin. Progress has ... ...

Abstract	Research on sediments recovered during Ocean Drilling Leg 160 has concentrated on two issues: the first concerned the stratigraphy of sapropel formation, the second was oriented to clarify specific processes that explain sapropel origin. Progress has been made in the construction of stratigraphic composites out of sedimentary sequences from individual holes at each of the palaeoceanographic sites. On the composites, initial work has resulted in the establishment of high-resolution and intermediate-resolution stratigraphies for three sites (963, 964, 967); correlation of sedimentary cycles to astronomical (insolation) cycles extends the stratigraphies to Sites 969 and 966. The sapropel occurrences in the marine and land sequences over the entire Eastern Mediterranean are correlated; with the resolution that can be obtained from isotope studies, groups of sapropels occurred simultaneously over the entire basin. In detail, however, the temporal and facies patterns of sapropel sequences differ between individual sites and depositional basins. The differences may be related to effects of water depth, diagenesis, and post-depositional tectonic attenuation of sequences. Studies on the geochemistry and facies of sapropels agree that anoxic conditions favoured preservation of organic matter in sapropels, caused the enrichment of trace metals associated with sapropels, and helped to preserve primary sedimentary structures. Besides, all evidence is consistent with elevated fluxes of organic matter and associated elements during sapropel events.
Language	English
Dates of publication	2000-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to doi:10.1016/S0031-0182(00)00059-6
DOI	10.1594/PANGAEA.704622
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Conference proceedings ; Online: Geochemistry of Peru margin sediments, supplementary data to: Emeis, Kay-Christian; Boothe, Paul N; Katz, Barry J; Morse, John W; Presley, Bob J; von Breymann, Marta T (1990): Geochemical data report for Peru Margin sediments from Sites 680, 682, 685, and 688. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 683-692

Emeis, Kay-Christian / Boothe, Paul N / Katz, Barry J / Morse, John W / Presley, Bob J / von Breymann, Marta T

1990

Abstract: This data report tabulates results of chemical analyses of sediments from four sites (680, 682, 685, and 688) drilled during Leg 112 offshore Peru. These sediments were recovered from the forearc basins underlying the Peru upwelling area. They are ... ...

Abstract	This data report tabulates results of chemical analyses of sediments from four sites (680, 682, 685, and 688) drilled during Leg 112 offshore Peru. These sediments were recovered from the forearc basins underlying the Peru upwelling area. They are equivalent in facies and age to the Pisco and Monterey formations, both of which are of considerable economic and geological interest as hydrocarbon source rocks deposited under conditions of coastal upwelling. Sediments recovered from the shelf (Site 680) and slope (Sites 682, 685, and 688) during Leg 112 are unconsolidated and are thermally immature. A lack of consolidation and thermal catagenesis makes these deposits ideal targets for chemical investigation into effects of early diagenesis in organic-carbon-rich siliceous muds.
Language	English
Dates of publication	1990-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Conference proceedings ; Online
Note	This dataset is supplement to doi:10.2973/odp.proc.sr.112.203.1990
DOI	10.1594/PANGAEA.753824
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Book ; Online: Sulfur isotope composition of pore fluids at ODP Sites 128-798 and 128-799, supplementary data to: Torres, Marta E; Brumsack, Hans-J?rgen; Bohrmann, Gerhard; Emeis, Kay-Christian (1996): Barite fronts in continental margin sediments: A new look at barium remobilization in the zone of sulfate reduction and formation of heavy barites in diagenetic fronts. Chemical Geology, 127(1), 125-139

Torres, Marta E / Bohrmann, Gerhard / Brumsack, Hans-J?rgen / Emeis, Kay-Christian

1996

Abstract: Micro-crystalline barites recovered by deep-sea drilling from Site 684 on the Peru margin and Site 799 in the Japan Sea are highly enriched in the heavy sulfur isotope relative to seawater ( d34S up to +84?). This isotopic composition is consistent with ... ...

Abstract	Micro-crystalline barites recovered by deep-sea drilling from Site 684 on the Peru margin and Site 799 in the Japan Sea are highly enriched in the heavy sulfur isotope relative to seawater ( d34S up to +84?). This isotopic composition is consistent with remobilization of biogenic barite triggered by sulfate reduction, and subsequent reprecipitation as a diagenetic barite front. The high levels of barium sulfate in these deposits (10-50%) cannot be explained by a diffusive transport model in sediments experiencing a constant rate of sedimentation. When sedimentation rates change radically, the barite front will remain at a given depth interval leading to large accumulations of barium sulfate. Such conditions may have generated the barite deposits at Site 799. At Site 684, on the other hand, there is evidence that the barite deposits are a result of the tectonically-driven advection of sulfate-bearing fluids through the sediment column.
Language	English
Dates of publication	1996-9999
Size	Online-Ressource
Publisher	PANGAEA - Data Publisher for Earth & Environmental Science
Publishing place	Bremen/Bremerhaven
Document type	Book ; Online
Note	This dataset is supplement to doi:10.1016/0009-2541(95)00090-9
DOI	10.1594/PANGAEA.704809
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Long-term function of a novel autologous transcatheter pulmonary heart valve implant in an adult animal model.

Kiekenap, Jonathan / Sun, Xiaolin / Hao, Yimeng / Steitz, Marvin / Breitenstein-Attach, Alexander / Emeis, Jasper / Berger, Felix / Schmitt, Boris

Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions

2024 Volume 103, Issue 4, Page(s) 597–606

Abstract: Background: Current heart valve implants entail major disadvantages in the treatment for younger patients or those with congenital heart defects.: Aim: Evaluation of novel transcatheter pulmonary valve implant made from autologous pericardium with ... ...

Abstract	Background: Current heart valve implants entail major disadvantages in the treatment for younger patients or those with congenital heart defects. Aim: Evaluation of novel transcatheter pulmonary valve implant made from autologous pericardium with natural crosslinking agent in an in vitro setup and in vivo animal model METHODS: Valves were tested in a pulse duplicator according to ISO-standard 5840. For in vivo studies computer tomography was performed to measure sheep's native pulmonary valve dimensions. Pericardium was harvested by thoracotomy, personalized implants were manufactured and deployed in pulmonary valve position of the same sheep. Every 3 months implant functionality was evaluated by intracardiac echocardiography, intracardiac pressure measurements and cardiac magnetic resonance imaging (cMRI). Implants were explanted for macroscopic and histological examination. Results: In vitro experiments showed compliance with regulatory requirements in terms of valve opening and insufficiency. Five sheep successfully received an autologous valve implant. Two animals had to be euthanized due to trauma sustained in the stable. Long-term valve function was excellent in three out of four animals with median implant cMRI regurgitation fraction of 9% (n = 4) at 3 months, 8% (n = 3) at 6, 8% (n = 3) at 9, 12% (n = 3) at 13, 8% (n = 2) at 17% and 8% (n = 2) at 20.5 months after implantation. Despite good adherence to neighboring tissue and endothelization, histological assessment revealed some signs of degeneration. Conclusion: Transcatheter pulmonary valve implants showed promising function for up to 20.5 months encouraging research to further improve this approach.
MeSH term(s)	Humans ; Adult ; Animals ; Sheep ; Pulmonary Valve/diagnostic imaging ; Pulmonary Valve/surgery ; Heart Valve Prosthesis ; Heart Valve Prosthesis Implantation/adverse effects ; Heart Valve Prosthesis Implantation/methods ; Treatment Outcome ; Heart Valves/surgery ; Models, Animal
Language	English
Publishing date	2024-03-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	1459995-8
ISSN	1522-726X ; 1522-1946
ISSN (online)	1522-726X
ISSN	1522-1946
DOI	10.1002/ccd.30992
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Article ; Online: In Vitro Comparison of a Closed and Semi-closed Leaflet Design for Adult and Pediatric Transcatheter Heart Valves.

Breitenstein-Attach, Alexander / Steitz, Marvin / Sun, Xiaolin / Hao, Yimeng / Kiekenap, Jonathan / Emeis, Jasper / Tuladhar, Sugat Ratna / Berger, Felix / Schmitt, Boris

Annals of biomedical engineering

2024

Abstract: Transcatheter heart valve replacements (TVR) are mostly designed in a closed position (c) with leaflets coaptating. However, recent literature suggests fabricating valves in semi-closed (sc) position to minimize pinwheeling. With about 100,000 children ... ...

Abstract	Transcatheter heart valve replacements (TVR) are mostly designed in a closed position (c) with leaflets coaptating. However, recent literature suggests fabricating valves in semi-closed (sc) position to minimize pinwheeling. With about 100,000 children in need of a new pulmonary valve each year worldwide, this study evaluates both geometrical approaches in adult as well as pediatric size and condition. Three valves of each geometry were fabricated in adult (30 mm) and pediatric (15 mm) size, using porcine pericardium. To evaluate performance, the mean transvalvular pressure gradient (TPG), effective orifice area (EOA), and regurgitation fraction (RF) were determined in three different annulus geometries (circular, elliptic, and tilted). For both adult-sized valve geometries, the TPG (TPG
Language	English
Publishing date	2024-04-13
Publishing country	United States
Document type	Journal Article
ZDB-ID	185984-5
ISSN	1573-9686 ; 0191-5649 ; 0090-6964
ISSN (online)	1573-9686
ISSN	0191-5649 ; 0090-6964
DOI	10.1007/s10439-024-03502-3
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Conference proceedings ; Online: A Quic(k) Security Overview

Tatschner, Stefan / Peters, Sebastian / Emeis, David / Morris, John / Newe, Thomas

A Literature Research on Implemented Security Recommendations

2023

Abstract: Built on top of UDP, the relatively new QUIC protocol serves as the baseline for modern web protocol stacks. Equipped with a rich feature set, the protocol is defined by a 151 pages strong IETF standard complemented by several additional documents. ... ...

Abstract	Built on top of UDP, the relatively new QUIC protocol serves as the baseline for modern web protocol stacks. Equipped with a rich feature set, the protocol is defined by a 151 pages strong IETF standard complemented by several additional documents. Enabling fast updates and feature iteration, most QUIC implementations are implemented as user space libraries leading to a large and fragmented ecosystem. This work addresses the research question, "if a complex standard with a large number of different implementations leads to an insecure ecosystem?". The relevant RFC documents were studied and "Security Consideration"items describing conceptional problems were extracted. During the research, 13 popular production ready QUIC implementations were compared by evaluating 10 security considerations from RFC9000. While related studies mostly focused on the functional part of QUIC, this study confirms that available QUIC implementations are not yet mature enough from a security point of view.
Keywords	QUIC ; RFC9000 ; security considerations ; web
Subject code	303
Language	English
Publishing country	de
Document type	Conference proceedings ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: American Midwifery Certification Board Certification Demographic and Employment Data, 2016 to 2020: The Certified Nurse-Midwife and Certified Midwife Workforce.

Thumm, E Brie / Emeis, Cathy L / Snapp, Carol / Doublestein, Lydia / Rees, Rebecca / Vanderlaan, Jennifer / Tanner, Tanya

Journal of midwifery & women's health

2023 Volume 68, Issue 5, Page(s) 563–574

Abstract: Introduction: Expansion and diversification of the midwifery workforce is a federal strategy to address the maternal health crisis in the United States. Understanding characteristics of the current midwifery workforce is essential to creating approaches ...

Abstract	Introduction: Expansion and diversification of the midwifery workforce is a federal strategy to address the maternal health crisis in the United States. Understanding characteristics of the current midwifery workforce is essential to creating approaches to its development. Certified nurse-midwives and certified midwives (CNMs/CMs) certified by the American Midwifery Certification Board (AMCB) constitute the largest portion of the US midwifery workforce. This article aims to describe the current midwifery workforce based on data collected from all AMCB-certified midwives at the time of certification. Methods: Midwife initial certificants and recertificants were administered an electronic survey about personal and practice characteristics at the time of certification by AMCB between 2016 and 2020 for administrative purposes. Given the standard 5-year certification cycle, every midwife certified during this period completed the survey once. The AMCB Research Committee conducted a secondary data analysis of deidentified data to describe the CNM/CM workforce. Results: In 2020 there were 12,997 CNMs/CMs in the United States. The workforce was largely White and female with an average age of 49. There has been a slow increase (15% to 21%) of initial certificants identifying as midwives of color. The proportion of CMs to all AMCB-certified midwives remained less than 2%. Physician-owned practices were the most common employer. Approximately 60% of midwives attend births, and hospitals were the most common birth setting. Over 10% of those certified to practice reported not working within the discipline of midwifery. Discussion: Targeted recruitment and retention of midwives must take into consideration not just expansion but dispersion, scope of practice, and diversification. The proportion of midwives attending births was lower than reported in previous years. Expansion of the CM credential and accessible educational pathways are 2 potential solutions to workforce growth. Developing strategies to retain those who are trained but not practicing presents an opportunity for workforce maintenance.
MeSH term(s)	Pregnancy ; Female ; Humans ; United States ; Middle Aged ; Midwifery ; Nurse Midwives ; Certification ; Workforce ; Employment ; Demography
Language	English
Publishing date	2023-06-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	2008180-7
ISSN	1542-2011 ; 1526-9523
ISSN (online)	1542-2011
ISSN	1526-9523
DOI	10.1111/jmwh.13511
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Article ; Online: Four-Dimensional Computed Tomography-Guided Valve Sizing for Transcatheter Pulmonary Valve Replacement.

Sun, Xiaolin / Hao, Yimeng / Sebastian Kiekenap, Jonathan Frederik / Emeis, Jasper / Steitz, Marvin / Breitenstein-Attach, Alexander / Berger, Felix / Schmitt, Boris

Journal of visualized experiments : JoVE

2022 , Issue 179

Abstract: ... cardiac CT from sheep J was chosen to illustrate the procedures. 3D cardiac CT was imported into 3D ... with the 4D measurements. In sheep J, 4D CT measurements from the straightened model resulted in the same ... choice of valve size for TPVR (30 mm) as 3D measurements. The RVEF of sheep J from pre-CT was 62.1 ...

Abstract	The measurements of the right ventricle (RV) and pulmonary artery (PA), for selecting the optimal prosthesis size for transcatheter pulmonary valve replacement (TPVR), vary considerably. Three-dimensional (3D) computed tomography (CT) imaging for device size prediction is insufficient to assess the displacement of the right ventricular outflow tract (RVOT) and PA, which could increase the risk of stent misplacement and paravalvular leak. The aim of this study is to provide a dynamic model to visualize and quantify the anatomy of the RVOT to PA over the entire cardiac cycle by four-dimensional (4D) cardiac CT reconstruction to obtain an accurate quantitative evaluation of the required valve size. In this pilot study, cardiac CT from sheep J was chosen to illustrate the procedures. 3D cardiac CT was imported into 3D reconstruction software to build a 4D sequence which was divided into eleven frames over the cardiac cycle to visualize the deformation of the heart. Diameter, cross-sectional area, and circumference of five imaging planes at the main PA, sinotubular junction, sinus, basal plane of the pulmonary valve (BPV), and RVOT were measured at each frame in 4D straightened models prior to valve implantation to predict the valve size. Meanwhile, dynamic changes in the RV volume were also measured to evaluate right ventricular ejection fraction (RVEF). 3D measurements at the end of the diastole were obtained for comparison with the 4D measurements. In sheep J, 4D CT measurements from the straightened model resulted in the same choice of valve size for TPVR (30 mm) as 3D measurements. The RVEF of sheep J from pre-CT was 62.1 %. In contrast with 3D CT, the straightened 4D reconstruction model not only enabled accurate prediction for valve size selection for TPVR but also provided an ideal virtual reality, thus presenting a promising method for TPVR and the innovation of TPVR devices.
MeSH term(s)	Animals ; Cardiac Catheterization/methods ; Four-Dimensional Computed Tomography ; Heart Valve Prosthesis ; Heart Valve Prosthesis Implantation/methods ; Pilot Projects ; Prosthesis Design ; Pulmonary Valve/diagnostic imaging ; Pulmonary Valve/surgery ; Retrospective Studies ; Sheep ; Stroke Volume ; Treatment Outcome ; Ventricular Function, Right
Language	English
Publishing date	2022-01-20
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
ZDB-ID	2259946-0
ISSN	1940-087X ; 1940-087X
ISSN (online)	1940-087X
ISSN	1940-087X
DOI	10.3791/63367
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: A Quic(k) Security Overview

Tatschner, Stefan / Peters, Sebastian N. / Emeis, David / Morris, John / Newe, Thomas

A Literature Research on Implemented Security Recommendations

2023

Abstract	Built on top of UDP, the relatively new QUIC protocol serves as the baseline for modern web protocol stacks. Equipped with a rich feature set, the protocol is defined by a 151 pages strong IETF standard complemented by several additional documents. Enabling fast updates and feature iteration, most QUIC implementations are implemented as user space libraries leading to a large and fragmented ecosystem. This work addresses the research question, "if a complex standard with a large number of different implementations leads to an insecure ecosystem?". The relevant RFC documents were studied and "Security Consideration" items describing conceptional problems were extracted. During the research, 13 popular production ready QUIC implementations were compared by evaluating 10 security considerations from RFC9000. While related studies mostly focused on the functional part of QUIC, this study confirms that available QUIC implementations are not yet mature enough from a security point of view. Comment: to be published in: ARES 2023: The 18th International Conference on Availability, Reliability and Security, Benevento, Italy, August 2023
Keywords	Computer Science - Cryptography and Security
Subject code	303
Publishing date	2023-06-30
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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