69 research outputs found
A method for the reconstruction of unknown non-monotonic growth functions in the chemostat
We propose an adaptive control law that allows one to identify unstable
steady states of the open-loop system in the single-species chemostat model
without the knowledge of the growth function. We then show how one can use this
control law to trace out (reconstruct) the whole graph of the growth function.
The process of tracing out the graph can be performed either continuously or
step-wise. We present and compare both approaches. Even in the case of two
species in competition, which is not directly accessible with our approach due
to lack of controllability, feedback control improves identifiability of the
non-dominant growth rate.Comment: expansion of ideas from proceedings paper (17 pages, 8 figures),
proceedings paper is version v
The zCOSMOS 20k Group Catalog
We present an optical group catalog between 0.1 < z < 1 based on 16,500
high-quality spectroscopic redshifts in the completed zCOSMOS-bright survey.
The catalog published herein contains 1498 groups in total and 192 groups with
more than five observed members. The catalog includes both group properties and
the identification of the member galaxies. Based on mock catalogs, the
completeness and purity of groups with three and more members should be both
about 83% with respect to all groups that should have been detectable within
the survey, and more than 75% of the groups should exhibit a one-to-one
correspondence to the "real" groups. Particularly at high redshift, there are
apparently more galaxies in groups in the COSMOS field than expected from mock
catalogs. We detect clear evidence for the growth of cosmic structure over the
last seven billion years in the sense that the fraction of galaxies that are
found in groups (in volume-limited samples) increases significantly with cosmic
time. In the second part of the paper, we develop a method for associating
galaxies that only have photo-z to our spectroscopically identified groups. We
show that this leads to improved definition of group centers, improved
identification of the most massive galaxies in the groups, and improved
identification of central and satellite galaxies, where we define the former to
be galaxies at the minimum of the gravitational potential wells. Subsamples of
centrals and satellites in the groups can be defined with purities up to 80%,
while a straight binary classification of all group and non-group galaxies into
centrals and satellites achieves purities of 85% and 75%, respectively, for the
spectroscopic sample.Comment: 26 pages, 21 figures, published in ApJ (along with machine-readable
tables
Identification of Marine Biotechnology Value Chains with High Potential in the Northern Mediterranean Region
©2023. This manuscript version is made available under the CC-BY 4.0 license http://creativecommons.org/licenses/by/4.0/
This document is the Published, version of a Published Work that appeared in final form in Marine Drugs. To access the final edited and published work see https://doi.org/ 10.3390/md21070416Marine (blue) biotechnology is an emerging field enabling the valorization of new products
and processes with massive potential for innovation and economic growth. In the Mediterranean
region, this innovation potential is not exploited as well as in other European regions due to a
lack of a clear identification of the different value chains and the high fragmentation of business
innovation initiatives. As a result, several opportunities to create an innovative society are being
missed. To address this problem, eight Northern Mediterranean countries (Croatia, France, Greece Italy, Montenegro, Portugal, Slovenia and Spain) established five national blue biotechnology hubs
to identify and address the bottlenecks that prevent the development of marine biotechnology in
the region. Following a three-step approach (1. Analysis: setting the scene; 2. Transfer: identifi cation of promising value chains; 3. Capitalization: community creation), we identified the three
value chains that are most promising for the Northern Mediterranean region: algae production for
added-value compounds, integrated multi-trophic aquaculture (IMTA) and valorization aquacul ture/fisheries/processing by-products, unavoidable/unwanted catches and discards. The potential
for the development and the technical and non-technical skills that are necessary to advance in this
exciting field were identified through several stakeholder events which provided valuable insight
and feedback that should be addressed for marine biotechnology in the Northern Mediterranean
region to reach its full potential
Myalgic encephalomyelitis/chronic fatigue Syndrome (ME/CFS) : Investigating care practices pointed out to disparities in diagnosis and treatment across European Union
ME/CFS is a chronic, complex, multisystem disease that often limits the health and functioning of the affected patients. Diagnosing patients with ME/CFS is a challenge, and many different case definitions exist and are used in clinical practice and research. Even after diagnosis, medical treatment is very challenging. Symptom relief and coping may affect how patients live with their disease and their quality of life. There is no consensus on which diagnostic criteria should be used and which treatment strategies can be recommended for patients. The purpose of the current project was to map the landscape of the Euromene countries in respect of national guidelines and recommendations for case definition, diagnosis and clinical approaches for ME/CFS patients. A 23 items questionnaire was sent out by email to the members of Euromene. The form contained questions on existing guidelines for case definitions, treatment/management of the disease, tests and questionnaires applied, and the prioritization of information for data sampling in research. We obtained information from 17 countries. Five countries reported having national guidelines for diagnosis, and five countries reported having guidelines for clinical approaches. For diagnostic purposes, the Fukuda criteria were most often recommended, and also the Canadian Consensus criteria, the International Consensus Criteria and the Oxford criteria were used. A mix of diagnostic criteria was applied within those countries having no guidelines. Many different questionnaires and tests were used for symptom registration and diagnostic investigation. For symptom relief, pain and anti-depressive medication were most often recommended. Cognitive Behavioral Therapy and Graded Exercise treatment were often recommended as disease management and rehabilitative/palliative strategies. The lack of consistency in recommendations across European countries urges the development of regulations, guidance and standards. The results of this study will contribute to the harmonization of diagnostic criteria and treatment for ME/CFS in Europe
The close environment of 24 micron galaxies at 0.6<z<1.0 in the COSMOS field
We investigate the close environment of 203 Spitzer 24 micron-selected
sources at 0.6<z<1.0 using zCOSMOS-bright redshifts and spectra of I<22.5 AB
mag galaxies, over 1.5 sq. deg. of the COSMOS field. We quantify the degree of
passivity of the LIRG and ULIRG environments by analysing the fraction of close
neighbours with Dn(4000)>1.4. We find that LIRGs at 0.6<z<0.8 live in more
passive environments than those of other optical galaxies that have the same
stellar mass distribution. Instead, ULIRGs inhabit more active regions (e.g.
LIRGs and ULIRGs at 0.6<z<0.8 have, respectively, (42.0 +/- 4.9)% and (24.5 +/-
5.9)% of neighbours with Dn (4000)>1.4 within 1 Mpc and +/- 500 km/s). The
contrast between the activities of the close environments of LIRGs and ULIRGs
appears especially enhanced in the COSMOS field density peak at z~0.67, because
LIRGs on this peak have a larger fraction of passive neighbours, while ULIRGs
have as active close environments as those outside the large-scale structure.
The differential environmental activity is related to the differences in the
distributions of stellar mass ratios between LIRGs/ULIRGs and their close
neighbours, as well as in the general local density fields. At 0.8<z<1.0,
instead, we find no differences in the environment densities of ULIRGs and
other similarly massive galaxies, in spite of the differential activities. We
discuss a possible scenario to explain these findings.Comment: ApJ, in press. 9 pages, including 5 figure
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