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Tunisia is one of the most important olive growing countries in the Mediterranean basin and it is classified in fourth rank on world scale in terms of olive oil production. Since the emergence of the modern oliviculture, the identification, the evaluation and conservation of the local genetic resources have been considered as a priority in countries like Tunisia. Molecular studies for genetic characterization allowed to enhance knowledge about the autochtonous olive germplasm, but currently it lacks a systematic and extensive work to compare and validate Tunisian olive varieties. This work focused on the molecular characterization and identification of 21 olive accessions grown mainly in the South East of Tunisia using a set of 16 microsatellite molecular markers. An extent of authentication process was also carried out by comparison with molecular profiles from Tunisian cultivars already characterized from official collections obtained from a set of 12 commonly shared macrosatellite markers by different authors. Population structure analysis of the Tunisian olive germplasm was also conducted using structure software. The results highlighted that no correlation between geographical and genetic origin occurred. New alleles were individuated, and two new genotypes were characterized contributing to enhance the Tunisian germplasm biodiversity. This work allowed individuating a few olive accessions that should be considered as reference cultivar in the authentication process and contributed to clarify the genetic pattern of the Tunisian germplasm.

Nissrine Louhab,1 Nawal Adali,1 Mehdi Laghmari,2 Wafae El Hymer,2 Said Ait Ben Ali,2 Najib Kissani11Neurology Department, 2Neurosurgery Department, University Hospital of Mohammed the VIth, Cadi Ayyad University, Marrakech, MoroccoIntroduction: Spontaneous intracranial hypotension is an infrequent cause of secondary headache due to cerebrospinal fluid (CSF) hypovolemia.Objective: To describe a case of headache revealing spontaneous intracranial hypotension complicated by subdural hematoma following lumbar puncture.Observation: A 34-year-old man presented with acute postural headache. The first cerebral computed tomography scan was normal. Lumbar puncture showed hyperproteinorachy at 2 g/L with six lymphocytic cells. The headache became very intense. At admission, clinical examination was normal. Ophthalmological examination did not show any abnormalities. Encephalic magnetic resonance imaging (MRI) showed bilateral subdural hematoma with tonsillar descent simulating Chiari type I malformation. After surgical drainage and symptomatic treatment, the patient was discharged with no recurrence.Conclusion: Spontaneous intracranial hypotension is associated with simple clinical presentation, orthostatic headache, and characteristic MRI findings. Misdiagnosed, it leads to unnecessary procedures.Keywords: intracranial hypotension, headache, magnetic resonance imaging

This paper considers the problem of minimizing the ordered weighted average (or ordered median) function of finitely many rational functions over compact semi-algebraic sets. Ordered weighted averages of rational functions are not, in general, neither rational functions nor the supremum of rational functions so that current results available for the minimization of rational functions cannot be applied to handle these problems. We prove that the problem can be transformed into a new problem embedded in a higher dimension space where it admits a convenient representation. This reformulation admits a hierarchy of SDP relaxations that approximates, up to any degree of accuracy, the optimal value of those problems. We apply this general framework to a broad family of continuous location problems showing that some difficult problems (convex and non-convex) that up to date could only be solved on the plane and with Euclidean distance, can be reasonably solved with different $\ell_p$-norms and in any finite dimension space. We illustrate this methodology with some extensive computational results on location problems in the plane and the 3-dimension space., 27 pages, 1 figure, 7 tables