Search results for "MEIS"
showing 10 items of 38 documents
On the ecology of littoral Oligochaeta of an oligotrophic Finnish lake
1982
In material sampled from 0.5–6 m on two sampling dates and three subareas the dominant Oligochaeta were Limnodrilus hoffmeisteri Claparede and Peloscolex ferox (Eisen), both composing more than 30% of the abundances of oligochaetes present. The numbers of Oligochaeta were mostly higher in August than in May. Regional differences could be found although the lake seems to be very homogenous. Temporal and vertical variations were detectable in separate subareas. The oligochaete biomass was maximal at 2 m depth. In soft bottom sediments the oligochaetes composed 15.9% of macrobenthos biomass and 12.2% of numbers, but on the stony bottom only 1.9% of numbers. The ratio of Oligochaeta/Chironomida…
BDNF, but not NT-4, is necessary for normal development of Meissner corpuscles.
2005
Abstract Meissner corpuscles are rapidly adapting cutaneous mechanoreceptors depending for development on TrkB expressing sensory neurons, but it remains to be established which of the known TrkB ligands, BDNF or NT-4, is responsible of this dependence. In this study we analyze Meissner corpuscles in the digital pads of mice with target mutations in the genes encoding for either BDNF or NT-4, using immunohistochemistry and transmission-electron microscopy, and they were identified based on their morphology and expression of S100 protein. All wild-type animals as well as NT-4 −/− animals and BDNF and NT4 heterozygous animals have Meissner corpuscles that are normal in number and size. Howeve…
Jāņa Ezeriņa personības un daiļrades iepazīšana 11.klasē
2019
Šī bakalaura darba “Jāņa Ezeriņa personības un daiļrades iepazīšana 11. klasē” mērķis ir izpētīt Jāņa Ezeriņa personību un daiļradi, kā arī rast risinājumu tam, ar kādu metožu palīdzību vislabāk un visefektīvāk iespējams skolā parādīt šī rakstnieka daiļrades nozīmību un neatkārtojamību. Darbs sastāv no 4 daļām. Tās ir Jāņa Ezeriņa personība un daiļrade vidusskolas mācību kontekstā, gatavošanās darbam mācību stundās, kas sastāv no trīs apakštematiem ( klases raksturojums, mācību metožu izvēle un pamatojums, stundu cikla tematiskais plānojums), mācību stundu norise, pašizvērtējums un analīze. Atslēgas vārdi šim bakalaura darbam ir Jānis Ezeriņš, karnevālisms, anekdotisms, novele, stāsts, īspr…
Influence of magnetic field on cooling by normal-insulator–superconductor junctions
2000
Cooling by normal-insulator–superconductor junctions in external magnetic field has been studied experimentally. For all orientations of magnetic field the cooling performance correlates with the magnetic field dependent superconducting energy gap Δ(H). In perpendicular orientation of magnetic field with respect to the sample plane, additional degradation of the cooling power originates from scattering of nonequilibrium quasiparticles in the superconductor on magnetic vortices. The effect is hysteretic and its magnitude depends on the shape of the superconducting probes.
Effect of a Locally Repulsive Interaction on s-wave Superconductors
2016
The thermodynamic impact of the Coulomb repulsion on s-wave superconductors is analyzed via a rigorous study of equilibrium and ground states of the strong coupling BCS-Hubbard Hamiltonian. We show that the one-site electron repulsion can favor superconductivity at fixed chemical potential by increasing the critical temperature and/or the Cooper pair condensate density. If the one-site repulsion is not too large, a first or a second order superconducting phase transition can appear at low temperatures. The Meißner effect is shown to be rather generic but coexistence of superconducting and ferromagnetic phases is also shown to be feasible, for instance, near half-filling and at strong repul…
Bērnu izpratnes par veselīgu uzturu veicināšana vecākajā pirmsskolas vecumā
2022
Kvalifikācijas darba autore: Kristiāna Lučiņina Kvalifikācijas darba temats: “Bērnu izpratnes par veselīgu uzturu veicināšana vecākajā pirmsskolas vecumā”. Veselīgs un sabalansēts uzturs ir svarīga bērna ikdienas sastāvdaļa. Šajā saspringtajā, aizņemtajā laikā, arvien vairāk bērnu uzturā tiek iekļauti ātri pagatavojami, pusgatavi ēdieni vai ēdieni no ātro uzkodu restorāniem. Ģimenēs joprojām maz tiek runāts par veselīgu, pilnvērtīgu uzturu, nepieciešamajām uzturvielām, kuras nepieciešamas bērna augšanai un attīstībai. Pirmsskolas izglītības iestādēs būtu svarīgi veicināt izpratni par uztura ietekmi uz mazā bērna veselību. Mūsdienās nozīmīga problēma ir bērnu neveselīgi ēšanas paradumi, tāpē…
Incommensurate phases of a bosonic two-leg ladder under a flux
2016
A boson two--leg ladder in the presence of a synthetic magnetic flux is investigated by means of bosonization techniques and Density Matrix Renormalization Group (DMRG). We follow the quantum phase transition from the commensurate Meissner to the incommensurate vortex phase with increasing flux at different fillings. When the applied flux is $\rho \pi$ and close to it, where $\rho$ is the filling per rung, we find a second incommensuration in the vortex state that affects physical observables such as the momentum distribution, the rung-rung correlation function and the spin-spin and charge-charge static structure factors.
Abelian dominance and the dual Meissner effect in local unitary gauges in SU(2) gluodynamics
2007
Performing highly precise Monte-Carlo simulations of SU(2) gluodynamics, we observe for the first time Abelian dominance in the confining part of the static potential in local unitary gauges such as the F12 gauge. We also study the flux-tube profile between the quark and antiquark in these local unitary gauges and find a clear signal of the dual Meissner effect. The Abelian electric field is found to be squeezed into a flux tube by the monopole supercurrent. This feature is the same as that observed in the non-local maximally Abelian gauge. These results suggest that the Abelian confinement scenario is gauge independent. Observing the important role of space-like monopoles in the Polyakov g…
2020
Electrophilic (het)arenes can undergo reactions with nucleophiles yielding π- or Meisenheimer (σ-) complexes or the products of the SNAr addition/elimination reactions. Such building blocks have only rarely been employed for the design of enzyme inhibitors. Herein, we demonstrate the combination of a peptidic recognition sequence with such electrophilic (het)arenes to generate highly active inhibitors of disease-relevant proteases. We further elucidate an unexpected mode of action for the trypanosomal protease rhodesain using NMR spectroscopy and mass spectrometry, enzyme kinetics and various types of simulations. After hydrolysis of an ester function in the recognition sequence of a weakly…
A novel paramagnetic molecular superconductor formed by bis(ethylenedithio)tetrathiafulvalene, tris(oxalato)ferrate(iii) anions and bromobenzene as g…
2005
The new paramagnetic molecular superconductor ET4[(H3O)Fe(C2O4)3]·C6H5Br (1) (Tc = 4.0 K) contains layers of superconducting ET donors alternating with paramagnetic hexagonal layers formed by (H3O)+, [Fe(C2O4)3]3− and guest C6H5Br molecules located in the hexagonal cavities. Conductivity measurements show metallic behavior from room temperature with a minimum in the resistivity at ca. 50 K followed by a smooth increase and a sharp drop in the resistivity with an onset at 4.0 K and a zero resistance at ca. 1.0 K. Magnetoresistance measurements indicate that Hc1 is about 7 mT and that Hc2 is very anisotropic (Hc2⊥ ≥ 5.5 T and Hc2|| ≈ 0.5 T). Magnetic susceptibility measurements show the expec…