Results 101 to 110 of about 18,304 (313)

A Skellam GARCH model

Brazilian Journal of Probability and Statistics, 2018
This paper considers the modeling of nonstationary integer valued time series with conditional heteroskedasticity using Skellam distribution. Two approaches of estimation of the model’s parameters are treated and discussed. The obtained results are verified through some numerical simulation.
Alomani, Ghadah A., Alzaid, Abdulhamid A., Omair, Maha A.   +2 more
openaire   +3 more sources

Topological Properties of International Commodity Market: How Uncertainty Affects the Linkages?

Agribusiness, EarlyView.
ABSTRACT The study aims to explore the network topology of the international commodity market by examining the interconnections among 21 commodity futures across various categories, including energy, precious and industrial metals, and agriculture. We analyze the market structure of these commodity futures under both low and high uncertainty conditions
Ibrahim Yagli, Bayram Deviren
wiley   +1 more source

Artificial microbial consortia for bioproduction processes

Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023
Abstract The application of artificial microbial consortia for biotechnological production processes is an emerging field in research as it offers great potential for the improvement of established as well as the development of novel processes. In this review, we summarize recent highlights in the usage of various microbial consortia for the production
Fabian Mittermeier, Miriam Bäumler, Prasika Arulrajah, José de Jesús García Lima, Sebastian Hauke, Anna Stock, Dirk Weuster‐Botz   +6 more
wiley   +1 more source

Streamlining of a synthetic co‐culture towards an individually controllable one‐pot process for polyhydroxyalkanoate production from light and CO2

Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023
Abstract Rationally designed synthetic microbial consortia carry a vast potential for biotechnological applications. The application of such a consortium in a bioprocess, however, requires tight and individual controllability of the involved microbes.
Franziska Kratzl, Andreas Kremling, Katharina Pflüger‐Grau   +2 more
wiley   +1 more source

Chemische Proteomik enthüllt menschliche Off‐Targets der durch Fluorchinolone induzierten mitochondrialen Toxizität

Angewandte Chemie, EarlyView.
Ein schematischer Überblick über die schädlichen Wirkungen von Ciprofloxacin im Zusammenhang mit mitochondrialer Toxizität. AIFM1 spielt eine Rolle beim MIA40‐vermittelten Import in das IMS und bei der oxidativen Faltung von kernkodierten Proteinen, einschließlich der Untereinheiten der ETC‐Komplexe I und IV.
Till Reinhardt, Yassmine El Harraoui, Alex Rothemann, Adrian T. Jauch, Sigrid Müller‐Deubert, Martin F. Köllen, Timo Risch, Lianne J. H. C. Jacobs, Rolf Müller, Franziska R. Traube, Denitsa Docheva, Stefan Zahler, Jan Riemer, Nina C. Bach, Stephan A. Sieber   +14 more
wiley   +1 more source

Application of an Escherichia coli triple reporter strain for at‐line monitoring of single‐cell physiology during L‐phenylalanine production

Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023
Abstract Biotechnological production processes are sustainable approaches for the production of biobased components such as amino acids for food and feed industry. Scale‐up from ideal lab‐scale bioreactors to large‐scale processes is often accompanied by loss in productivity.
Manh Dat Hoang, Dieu Thi Doan, Marlen Schmidt, Harald Kranz, Andreas Kremling, Anna‐Lena Heins   +5 more
wiley   +1 more source

GARCH models without positivity constraints: Exponential or Log GARCH? [PDF]

arXiv, 2012
This paper provides a probabilistic and statistical comparison of the log-GARCH and EGARCH models, which both rely on multiplicative volatility dynamics without positivity constraints. We compare the main probabilistic properties (strict stationarity, existence of moments, tails) of the EGARCH model, which are already known, with those of an asymmetric
arxiv  

Novel synthetic co‐culture of Acetobacterium woodii and Clostridium drakei using CO2 and in situ generated H2 for the production of caproic acid via lactic acid

Engineering in Life Sciences, Volume 23, Issue 1, January 2023., 2023
Abstract Acetobacterium woodii is known to produce mainly acetate from CO2 and H2, but the production of higher value chemicals is desired for the bioeconomy. Using chain‐elongating bacteria, synthetic co‐cultures have the potential to produce longer‐chained products such as caproic acid.
Jan Herzog, Alexander Mook, Lotta Guhl, Miriam Bäumler, Matthias H. Beck, Dirk Weuster‐Botz, Frank R. Bengelsdorf, An‐Ping Zeng   +7 more
wiley   +1 more source

Goodness-of-fit tests for extended Log-GARCH models [PDF]

arXiv, 2016
This paper studies goodness of fit tests and specification tests for an extension of the log-GARCH model which is stable by scaling. A Lagrange-Multiplier test is derived for testing the null assumption of extended log-GARCH against more general formulations including the Exponential GARCH (EGARCH).
arxiv  

Konkurrenz zwischen unimolekularen Ein‐ und Zwei‐Elektron‐Reaktionen später 3d‐Metallkomplexe [(Me3SiCH2)nM]– (M = Fe, Co, Ni, Cu; n = 2 – 4)

Angewandte Chemie, EarlyView.
Gasphasen‐Fragmentierungsexperimente und theoretische Rechnungen an einer Reihe von Modellkomplexen bestimmen die intrinsischen Neigungen später 3d‐Metalle, Ein‐ oder Zwei‐Elektron‐Reaktionen einzugehen, und decken die für die Selektivität entscheidenden Faktoren auf.
Torben Kühl, Lisa Hetzel, Christopher J. Stein, Konrad Koszinowski   +3 more
wiley   +1 more source