Search results for "ASYM"

The SO2F2 quasi-spherical top: Correspondence between tensorial and Watson's formalisms

2006

Abstract The SO2F2 quasi-spherical top molecule with C2v symmetry is considered as a distorted spherical top deriving from the SO 4 2 − tetrahedral ion. We present here a detailed correspondence between the tensorial formalism using the Td⊃C2v reorientation and the usual Hamiltonian of Watson. We have also performed ab initio calculations in order to determine the centrifugal distorsion constants in the vibrational ground state.

Relay Catalysis: Enantioselective Synthesis of Cyclic Benzo-Fused Homoallylic Alcohols by Chiral BrOnsted Acid-Catalyzed Allylboration/Ring Closing M…

2013

Six- and seven-membered benzo-fused cyclic homoallylic alcohols can be readily synthesized by a tandem chiral BrOnsted acid-catalyzed allyl (crotyl)boration/ring closing metathesis sequence performed under orthogonal relay catalysis conditions. Excellent enantio- and diastereoselectivities are obtained in most of the cases. In addition, the parent crotylboration/RCM process is also described. The required substrates, ortho-vinylbenzaldehydes, are readily available in one step from commercially available starting materials. Both catalysts and reactants are also available from commercial suppliers. The reaction shows broad functional group compatibility and is also suitable for heteroaromatic…

Can cystic lesions of the jaws be considered as the cause of mandibular asymmetry?

2021

The aim of this study is to investigate the presence of condylar and ramal asymmetry in patients with a cyst larger than 10 mm in the maxilla or mandible. Condylar and ramal asymmetry index measurements of 47 patients (mean age: 28.85 ± 15.348) in the study group and 40 patients in the control group (mean age: 33.73 ± 13.095) were performed using panoramic radiographs. The study group consists of patients with cysts larger than 10 mm in diameter in the maxilla or mandible. The control group consisted of patients with no radiolucent lesions and no history of trauma. The possible statistical difference between the groups was evaluated by the Mann-Whitney U test. No statistically significant d…

Heart rate variability and self-control–A meta-analysis

2016

We read the commentary on our meta-analysis with great interest and we greatly appreciate that the authors developed suggestions for further research on heart rate variability (HRV) and self-control. While we mostly support these suggestions, we believe that it is necessary to clarify some points raised with respect to our meta-analysis. The first point brought up by the authors of the commentary is the focus of our meta-analysis on HRV instead of vagal tone and the inclusion of studies using the standard deviation of RR intervals (SDNN). They argue that only vagal tone and HRV metrics reflecting vagal tone are expected to be linked to self-control according to both the Neurovisceral Integr…

Assessment of Asymmetrical Lower Limb Loading in the Short-Track Speed Skaters

2023

Background. Short-track speed skaters who regularly participate in training are exposed to the occurrence of asymmetry in the lower limb loading. 
 Objective. The study aimed to assess the symmetry of the lower limb loading in short track skaters and the relationship between age, training experience and anthropometric variables and symmetry of lower limb loading.
 Methods. The examined group consisted of 20 short-track speed skaters (12 men and 8 women), and the control group comprised 28 university students (14 men and 14 women). Two scales were used to assess the symmetry of lower limb loading, and the lower limb's loading symmetry index (LSI) was calculated. 
 Results. In …

Biological adaptation in light of the Lewontin–Williams (a)symmetry

2022

Neo-Darwinism characterises biological adaptation as a one-sided process, in which organisms adapt to their environment but not vice versa. This asymmetric relationship – here called Williams’ asymmetry – is called into question by Niche Construction Theory, which emphasises that organisms and their environments often mutually affect each other. Here we clarify that Williams’ asymmetry is specifically concerned with (quasi-) directed modifications towards phenotypes that increase individual fitness. This directedness – which drives the adaptive fit between organism and environment – entails far more than the mere presence of cause-effect relationships. We argue that difficulties with invoki…

Parameterizing 'lexical subject-finite verb' inversion across Verb Second languages: On the role of Relativized Minimality at the vP edge

2020

By discussing novel data from two Dolomitic Ladin languages spoken in Northern Italy, Badiotto and Gardenese, we show that in these Verb-second languages subject-finite verb inversion i) is constrained by the syntactic (adverb or object) and discourse (focus or topic) nature of the sentence-initial constituent, and by the discourse status of the DP subject. We demonstrate that in both varieties subjects in inversion either appear in a FocusP of the vP periphery (Belletti 2004, Poletto 2010) or in an A position in the IP layer, and that the observed distribution of inversion follows from two universal constraints of movement affecting extraction through the vP edge: a) cyclicity (extraction …

Sydämen parasympaattisen säätelyn arvioiminen sykevaihtelun avulla - autonomisen hermoston salpaustutkimus

2002

Martinmäki Kaisu. 2002. Sydämen parasympaattisen säätelyn arvioiminen sykevaihtelun avulla - autonomisen hermoston salpaustutkimus. Jyväskylän yliopisto. Liikuntafysiologian pro gradu -tutkielma. Parasympaattista hermoaktiivisuutta ei voida ihmisillä mitata suoraan, mutta sitä voidaan arvioida sydämen syketaajuudesta määritettyjen muuttujien avulla. Sykevaihtelua mitataan rutiininomaisesti ja sitä kuvaavat muuttujat ovat suhteellisen vakiintuneita. Sykemuuttujia tulkitaan ikään kuin niiden ja parasympaattisen aktiivisuuden välinen yhteys olisi lineaarinen, vaikka muuttujien mittateoreettisia ominaisuuksia ei ole tutkittu systemaattisesti. Tämän tutkimuksen tarkoituksena oli tarkastella, mil…

Sykemittauksen validiteetti työpaikalla tapahtuvassa päivittäisessä stressimittauksessa

2002

Ortostaattinen sykevaihtelu, mieliala ja hormonipitoisuudet uimareilla eri harjoituskausilla

2004

Katja Linnakylä. 2004. Ortostaattinen sykevaihtelu, mieliala ja hormonipitoisuudet uimareilla eri harjoituskausilla. Liikuntafysiologian Pro-Gradu –tutkielma. Liikuntabiologian laitos. Jyväskylän yliopisto. Autonomisen hermoston sympaattinen osa hallitsee sydämen toimintaa rasituksen aikana ja parasympaattinen osa levon aikana. Liiallisen fyysisen rasituksen seurauksena elimistö saattaa ajautua ylirasitustilaan, johon liittyy autonomisen säätelyn muutoksia. Tätä voidaan arvioida sydämen sykevaihtelulla (HRV = englannin kielen termi heart rate variability). Tässä menetelmässä yhtäjaksoisesta syketallenteesta analysoidaan peräkkäisten sykevälien pituuksia, joiden vaihteluun vaikuttaa autonomi…