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White matter abnormalities across different epilepsy syndromes in adults: an ENIGMA Epilepsy study
(2019)
The epilepsies are commonly accompanied by widespread abnormalities in cerebral white matter. ENIGMA-Epilepsy is a large quantitative brain imaging consortium, aggregating data to investigate patterns of neuroimaging abnormalities in common epilepsy syndromes, including temporal lobe epilepsy, extratemporal epilepsy, and genetic generalized epilepsy. Our goal was to rank the most robust white matter microstructural differences across and within syndromes in a multicentre sample of adult epilepsy patients. Diffusion-weighted MRI data were analyzed from 1,069 non-epileptic controls and 1,249 patients: temporal lobe epilepsy with hippocampal sclerosis (N=599), temporal lobe epilepsy with normal MRI (N=275), genetic generalized epilepsy (N=182) and nonlesional extratemporal epilepsy (N=193). A harmonized protocol using tract-based spatial statistics was used to derive skeletonized maps of fractional anisotropy and mean diffusivity for each participant, and fiber tracts were segmented using a diffusion MRI atlas. Data were harmonized to correct for scanner-specific variations in diffusion measures using a batch-effect correction tool (ComBat). Analyses of covariance, adjusting for age and sex, examined differences between each epilepsy syndrome and controls for each white matter tract (Bonferroni corrected at p<0.001). Across “all epilepsies” lower fractional anisotropy was observed in most fiber tracts with small to medium effect sizes, especially in the corpus callosum, cingulum and external capsule. Less robust effects were seen with mean diffusivity. Syndrome-specific fractional anisotropy and mean diffusivity differences were most pronounced in patients with hippocampal sclerosis in the ipsilateral parahippocampal cingulum and external capsule, with smaller effects across most other tracts. Those with temporal lobe epilepsy and normal MRI showed a similar pattern of greater ipsilateral than contralateral abnormalities, but less marked than those in patients with hippocampal sclerosis. Patients with generalized and extratemporal epilepsies had pronounced differences in fractional anisotropy in the corpus callosum, corona radiata and external capsule, and in mean diffusivity of the anterior corona radiata. Earlier age of seizure onset and longer disease duration were associated with a greater extent of microstructural abnormalities in patients with hippocampal sclerosis. We demonstrate microstructural abnormalities across major association, commissural, and projection fibers in a large multicentre study of epilepsy. Overall, epilepsy patients showed white matter abnormalities in the corpus callosum, cingulum and external capsule, with differing severity across epilepsy syndromes. These data further define the spectrum of white matter abnormalities in common epilepsy syndromes, yielding new insights into pathological substrates that may be used to guide future therapeutic and genetic studies.
An updated checklist of the Cerambycidae of Costa Rica is presented. This new version includes 1,071 species and subspecies in 429 genera, 69 tribes, and six subfamilies. Of these, 181 are new country records and 136 species are known only from Costa Rica. In addition, provincial distribution data are provided for each species. The checklist supports a wealth of scientific literature in many other groups of flora and fauna indicating Costa Rica has high species richness of cerambycid beetles.
A preliminary checklist of the Cerambycidae, Disteniidae, and Vesperidae (Coleoptera) of Peru is presented. Within Cerambycidae, we record five subfamilies, 55 tribes, 345 genera and subgenera, and 714 species. Within Disteniidae, we record one tribe, six genera, and 11 species. We also record one subfamily, one tribe, one genus, and two species within Vesperidae. Four new country records are recorded: one species in the tribe Anacolini (Cerambycidae: Prioninae): Cycloprionus flavus Tippmann, 1953; and three species in the tribe Onciderini (Cerambycidae: Lamiinae): Cacostola simplex (Pascoe, 1859); Marensis simplex (Bates, 1865); Trachysomus cavigibba Martins, 1975. In addition, 161 species recorded are known only from Peru.
Monneoncideres, a new genus of Onciderini Thomson, 1860 (Coleoptera: Cerambycidae: Lamiinae) is described and illustrated. Six new species of Onciderini are also described and illustrated: Hesycha tavakiliani from Brazil; Lesbates milleri from Venezuela; Monneoncideres cristata from Ecuador and Peru; Neodillonia waltersi from Ecuador; Tibiosioma martinsi from Ecuador; and Trestonia wappesi from Panama. Keys to the known species of Lesbates Dillon and Dillon, 1945 and Tibiosioma Martins and Galilleo, 1990 are provided. The genus Ophthalmocydrus Aurivillius, 1925 (Onciderini) is transferred to Pteropliini (Lamiinae); and Xylomimus Bates, 1865 (Apomecynini) is transferred to Onciderini. The following new synonymies are proposed: Kuauna Martins and Galileo, 2009 = Opthalmocydrus Aurivillius, 1925; Kuauna schmidi Martins and Galileo, 2009 = Ophthalmocydrus semiorbifer Aurivillius, 1925; Paraplerodia Martins and Galileo, 2010 = Tibiosioma Martins and Galileo, 2007; Paraplerodia acarinata Martins and Galileo, 2010 = Tibiosioma maculosa Martins and Galileo, 2007; and Ischiomaeocles Franz, 1954 = Lochmaeocles Bates, 1880. The following new combination is proposed: Lochmaeocles salvadorensis (Franz, 1954), transferred from Ischiomaeocles. The following 37 new country records are reported: Alexera barii (Jekel, 1861) (Bolivia, Ecuador); Bacuris sexvittatus (Bates, 1865) (Panama); Cacostola brasiliensis Thomson, 1868 (Argentina); Cherentes niveilateris (Thomson, 1868) (French Guiana); Cicatrodea monima Dillon and Dillon, 1946 (Ecuador); Clavidesmus metallicus (Thomson, 1868) (Ecuador, Peru); Cydros leucurus Pascoe, 1866 (Brazil); Ecthoea quadricornis (Olivier, 1792) (Ecuador); Eudesmus grisescens Audinet-Serville, 1835 (Ecuador, Trinidad and Tobago, Venezuela); Euthima variegata (Aurivillius, 1921) (Ecuador); Hesychotypa heraldica (Bates, 1872) (Belize, Guatemala); Hesychotypa punctata Martins, 1979 (Peru); Lochmaeocles basalis Dillon and Dillon, 1946 (Ecuador, Trinidad and Tobago); Lochmaeocles zonatus Dillon and Dillon, 1946 (Venezuela); Lydipta conspersa (Aurivillius, 1922) (Peru); Neocherentes dilloniorum Tippmann, 1960 (Brazil); Neolampedusa obliquator (Fabricius, 1801) (Ecuador); Peritrox perbra Dillon and Dillon, 1945 (Ecuador); Priscatoides tatila Dillon and Dillon, 1945 (Bolivia); Strioderes peruanus Giorgi, 2001 (Brazil); Trachysomus apipunga Martins and Galileo, 2008 (Peru); Trachysomus camelus Buquet, 1852 (Venezuela); Trachysomus peregrinus Thomson, 1858 (Ecuador); Trachysomus thomsoni Aurivillius, 1923 (Venezuela); Trestoncideres laterialba Martins and Galileo, 1990 (Brazil); Trestonia exotica Galileo and Martins, 1990 (Ecuador); Trestonia fulgurata Buquet, 1859 (Grenada, Trinidad and Tobago); Tritania dilloni Chalumeau, 1990 (Venezuela); Tulcus paganus (Pascoe, 1859) (Ecuador); Xylomimus baculus Bates, 1865 (French Guiana). Theobroma cacao Linnaeus (Sterculiaceae) is recorded as a new host plant record for Eudesmus grisescens.