Search results for " parametri"
showing 10 items of 171 documents
Veselīga uztura „šķīvja principa” maltīšu ietekme uz ķermeņa miesas būvi raksturojošiem antropometriskiem parametriem
2021
“Šķīvja princips” tiek uzskatīts par vienu no labākajiem veidiem, kā izglītot sabiedrību par veselīga uztura pamatprincipiem (Harvard University, 2011), nodrošinot organismu ar visām nepieciešamajām uzturvielām, minerālvielām un vitamīniem. Veselīga uztura “šķīvja princips” tiek plaši pielietots un ieteikts daudzu valstu, arī Latvijas Republikas Veselības ministrijas veselīga uztura rekomendācijās. Tomēr ir vērojams zinātnisko datu un pamatojuma trūkums “šķīvja principa” atbilstības novērtējumam uztura vadlīnijām. Tādēļ šī pētījuma mērķis ir novērtēt antropometrisko parametru izmaiņas paaugstinātas augu izcelsmes produktu diētas sešu nedēļu ievērošanas rezultātā pētījuma dalībniekiem ar atš…
Spatially-induced nestedness in a neutral model of phage-bacteria networks
2017
[EN] Ecological networks, both displaying mutualistic or antagonistic interactions, seem to share common structural traits: the presence of nestedness and modularity. A variety of model approaches and hypothesis have been formulated concerning the significance and implications of these properties. In phage-bacteria bipartite infection networks, nestedness seems to be the rule in many different contexts. Modeling the coevolution of a diverse virus¿host ensemble is a difficult task, given the dimensionality and multi parametric nature of a standard continuous approximation. Here, we take a different approach, by using a neutral, toy model of host¿phage interactions on a spatial lattice. Each …
Mapping effective connectivity between the frontal and contralateral primary motor cortex using dual-coil transcranial magnetic stimulation
2019
AbstractCytoarchitectonic, anatomical and electrophysiological studies have divided the frontal cortex into distinct functional subdivisions. Many of these subdivisions are anatomically connected with the contralateral primary motor cortex (M1); however, effective neurophysiological connectivity between these regions is not well defined in humans. Therefore, we aimed to use dual-coil transcranial magnetic stimulation (TMS) to map, with high spatial resolution, the effective connectivity between different frontal regions of the right hemisphere and contralateral M1 (cM1). TMS was applied over the left M1 alone (test pulse) or after a conditioning pulse was applied to different grid points co…
Dynamic image denoising for voxel-wise quantification with Statistical Parametric Mapping in molecular neuroimaging.
2018
Purpose PET and SPECT voxel kinetics are highly noised. To our knowledge, no study has determined the effect of denoising on the ability to detect differences in binding at the voxel level using Statistical Parametric Mapping (SPM). Methods In the present study, groups of subject-images with a 10%- and 20%- difference in binding of [123I]iomazenil (IMZ) were simulated. They were denoised with Factor Analysis (FA). Parametric images of binding potential (BPND) were produced with the simplified reference tissue model (SRTM) and the Logan non-invasive graphical analysis (LNIGA) and analyzed using SPM to detect group differences. FA was also applied to [123I]IMZ and [11C]flumazenil (FMZ) clinic…
Anterior limbic alpha-like activity: a low resolution electromagnetic tomography study with lorazepam challenge
2005
Summary Objective To verify findings of an independently regulated anterior limbic alpha band source. Methods In a randomised cross-over study, the spontaneous EEG was recorded in nine healthy subjects after i.v. lorazepam or placebo. Intracerebral current densities within classical frequency bands were estimated with low resolution electromagnetic tomography [LORETA] and compared between groups with t -statistical parametric mapping [SPM{ t }]. A region-of-interest [ROI] based method was used to compare frontal and occipital alpha band activity changes. Results Irrespective of treatment group, local maxima of alpha band power were localised both in the occipital lobe, Brodman area [BA] 18,…
Dopamine D2/D3 receptor availability and venturesomeness.
2011
The construct of impulsivity is considered as a major trait of personality. There is growing evidence that the mesolimbic dopamine system plays an important role in the modulation of impulsivity and venturesomeness, the two key components within the impulsivity-construct. The aim of the present study was to explore an association between trait impulsivity measured with self-assessment and the dopaminergic neurotransmission as measured by positron emission tomography (PET) in a cohort of healthy male subjects. In vivo D2/D3 receptor availability was determined with [(18)F]fallypride PET in 18 non-smoking healthy subjects. The character trait impulsivity was measured using the Impulsiveness-V…
Preserved visual-vestibular interaction in patients with bilateral vestibular failure
2004
Background: During caloric vestibular stimulation, subjects showed bilateral activation of the vestibular cortex in the posterior insula and retroinsular region as well as concurrent deactivation of visual cortex areas bilaterally. This finding was the basis for the concept of a reciprocal inhibitory interaction between the vestibular and the visual systems. Objective: To analyze the modulations of this activation and deactivation pattern in patients with loss of vestibular input, that is, in patients with bilateral vestibular failure (BVF). Methods: Modulations of regional cerebral blood flow (rCBF) in PET were measured in nine patients with BVF and compared with those in healthy volunteer…
Prevalence of lymph nodes in the parametrium of radical vaginal trachelectomy (RVT) specimen
2011
Objective: In order to evaluate radicality in fertility preserving surgery in women with early invasive cervical cancer we analyzed the parametrium of specimens of patients treated by radical vaginal trachelectomy for the presence of lymph nodes. We tried to identify morphologic factors associated with the presence of parametrial lymph nodes. Methods: We analyzed surgical specimens of 112 patients who underwent radical trachelectomy between June 2004 and April 2009 at the Department of Gynecologic Oncology at Charité Campus Benjamin Franklin and Campus Mitte. All parametrial tissue was step sectioned and a total of 1878H&E stained histological sections were analyzed. Results: In 8 patients …
Control of signal coherence in parametric frequency mixing with incoherent pumps: Narrowband mid-infrared light generation by downconversion of broad…
2012
International audience; We study, with numerical simulations using the generalized nonlinear envelope equation, the processes of optical parametric and difference- and sum-frequency generation (SFG) with incoherent pumps in optical media with both quadratic and third-order nonlinearity, such as periodically poled lithium niobate. With ultrabroadband amplified spontaneous emission pumps or continua (spectral widths > 10 THz), group-velocity matching of a near-IR pump and a short-wavelength mid-IR (MIR) idler in optical parametric generation may lead to more than 15-fold relative spectral narrowing of the generated MIR signal. Moreover, the SFG process may also lead to 6-fold signal coherence…
Apaļā jūrasgrunduļa Neogobius melanostomus populācijas bioloģisko parametru raksturojums Latvijas piekrastē
2019
Darbā tika analizētas apaļā jūrasgrunduļa bioloģisko parametru izmaiņas Latvijas piekrastē, balstoties uz komerciālās un rūpnieciskās zvejas datu analīzi laika posmā no 2014. – 2018. gadam. Baltijas jūras atklātajā daļā dzīvojošie apaļie jūrasgrunduļi sasniedz lielāku ķermeņa izmēru, nekā Rīgas jūras līcī dzīvojošie īpatņi, izaugot aptuveni par 2 cm garāki. Taču pēdējo gadu laikā abos reģionos ir samazinājies īpatņu vidējais garums, ka arī mazāko īpatņu masa. Papildus analizējot vecumstruktūru un dzimumstruktūru izmaiņas Baltijas jūras atklātajā daļā novērojams tēviņu īpatsvara pieaugums, kā arī populācijas novecošanās, vidējam vecumam sasniedzot 3,6 gadus. Tika konstatēti arī samērā svārst…