Early anterior knee pain in male adolescent basketball players is related to body height and abnormal knee morphology.

To compare knee torque, range of motion, quality of movement, and morphology in dominant and nondominant legs of male adolescent basketball players with and without anterior knee pain and untrained peers.Cross-sectional.Sports performance laboratory.Male basketball players aged 14-15 years with and without anterior knee pain and healthy untrained subjects (n = 88).Basketball players were allocated to a symptomatic or asymptomatic group based on self-reported anterior knee pain. Associations between pain and body mass, height, passive range of motion, muscle peak torque, coactivation, neuromuscular control, proprioception, and ultrasound observations were investigated.The prevalence of pain did not differ significantly between sides. Of 176 knees inspected, 44 were painful, and 26 of these exhibited abnormalities in ultrasonography. Symptomatic players were 5.0 and 6.9 cm taller than asymptomatic players and controls, respectively (P < 0.05). In athletes with knee pain, the odds ratios of morphological abnormalities and greater height were increased by 8.6 and 5.0 times (P < 0.001).Knee pain prevalence in adolescent basketball players was not related to differences between sides but was higher in tall players. Knee pain was accompanied by morphological abnormalities detected with ultrasound

Ultrafast relaxation of photoexcited carriers in semiconductor quantum wires: A Monte Carlo approach

A detailed analysis of the cooling and thermalization process for photogenerated carriers in semiconductor quantum wires is presented. The energy relaxation of the nonequilibrium carrier distribution is investigated for the ‘‘realistic'' case of a rectangular multisubband quantum-wire structure. By means of a direct ensemble Monte Carlo simulation of both the carrier and the phonon dynamics, all the nonlinear phenomena relevant for the relaxation process, such as carrier-carrier interaction, hot-phonon effects, and degeneracy, are investigated. The results of these simulated experiments show a significant reduction of the carrier-relaxation process compared to the bulk case, which is mainly due to the reduced efficiency of carrier-carrier scattering; on the contrary, the role of hot-phonon effects and degeneracy seems to be not so different from that played in bulk semiconductors

Converging upper and lower bounds for ground-state energies of atomic nuclei

By expanding the wave function in terms of the translationally invariant basis of harmonic oscillator functions, we calculate the converging upper (variational) bound for the energy. It is shown that one can construct lower bounds using the reduced density matrix that corresponds to the upper bound. These lower bounds converge to an exact value with the expansion of the basis. We perform the calculations of both bounds with realistic nucleon-nucleon potential for ground states of the triton and the alpha-particle

The influence of 3-(1H-Benzimidazol-2-yl)-4-phenylaminobutanoic acid sodium salt on summer rapeseed (Brassica napus L.) yield and oil quality

Atliktas įvairių koncentracijų 3-(1H-benzimidazol-2-il)-4-fenilaminobutano rūgšties natrio druskos poveikio vasariniams rapsams (Brassica napus L.) tyrimas laboratorijoje in vitro ir lauko sąlygomis. Išanalizavus gautus rezultatus konstatuota, kad tiriamasis junginys skatina rapsų augimą, didina derlių ir turi teigiamos įtakos aliejaus kokybei. In vitro sąlygomis jis padidino augalų biomasę, 2 mg/l koncentracijos tirpalas skatino rapsų šaknų augimą. Lauko sąlygomis šio junginio 100 mg/l koncentracijos tirpalas labiausiai padidino ankštarų kiekį ir sėklų svorį, o 125 mg/l – aliejaus kiekįThe influence of the biological activity of various concentrations of 3-(1H-benzimidazol-2-yl)-4-phenylamino-butanoic sodium salt on summer rapeseed was studied by the laboratory screening in vitro and in field conditions. It was determined that the study compound stimulated rapeseed growth, increased their yield and had a positive effect on the oil quality. This compound increased plant biomass in vitro and root length by 2 mg/l. In the field trials, rapeseed seedlings were sprayed with a 100 mg/l solution, and the number of siliques and the weight of seeds were found to be increased. When seedlings were sprayed with a 125 mg/l solution of the compound, the content of oil increased. The content of flavonoids and the radical scavenging activity were highest when seedlings were sprayed with a 75 mg/l solution of the compoundVytauto Didžiojo universitetasŽemės ūkio akademij

Influence of Electric Field and Carrier Localization on Carrier Dynamics in AlGaN Quantum Wells

Dynamics of nonequilibrium carriers in high-Al-content AlGaN/AlGaN multiple quantum wells was studied. A set of multiple quantum wells with well widths varying from 1.65 to 5.0 nm was grown by metal-organic chemical vapor deposition. The structures were investigated by photoluminescence spectroscopy under quasi-steady-state conditions. The observed blueshift of the photoluminescence band peak was attributed to the screening of the built-in electric field. The integrated photoluminescence intensity dependence on excitation and temperature showed a strong influence of carrier localization

Synthesis and investigation of 1-(bisubstituted phenyl)-4-carboxy-2-pyrrolidinones and products of their recyclization

Dėl aromatinių aminų sąveikos su itakono rūgštimi bei skaidant gautų junginių eterinę jungtį susintetinti 1-arilpakeisti 4-karboksi-2-pirolidinonai, kurių aromatiniame žiede yra nitro-, metoksi-, metil-, chlor- ir hidroksipakaitų. Biologiniams tyrimams susintetintos 1-pakeistų 4-karboksi-2-pirolidinonų natrio druskos, atlikta heterociklinio žiedo reciklizacija iki atitinkamų 4-arilamino-3-karboksibutanorūgščių dinatrio druskų. Laboratoriniu atrankos būdu ištirtas susintetintų natrio druskų pirminis biologinis aktyvumasBy interaction of aromatic amines with itaconic acid 1-arylsubstitutes 4-carboxy-2-pyrrolidinones were synthesized. In order to test them as growth stimulators of barley there were synthesized sodium salts of these compounds. 4-Arylamine-3-carboxy-butanic acid disodium salts were synthesized by interaction of pyrrolidinones with sodium hydroxide excess. The biological activity of synthesized salts was investigated by the method of laboratory screening at the Laboratory of Genetics and Biotechnology, Lithuanian University of Agriculture. 1 -(5-Chloro-2-metoxyphenyl)-4-carboxy-2-pyrrolidino-ne sodium salt stimulates the growth of roots and shoots of barley cultivars. In this variant, plants of this cultivar produce roots that are by 14% and shoots by 11 % longer than those of the control plants. 4-(3-Chloro-4-methoxyphenyl)-amino-3-carboxybutanic acid disodium salt stimulates the growth of roots by 19% and shoots by 24% more than in the control variant. This compound was chosen for further investigationsVytauto Didžiojo universitetasŽemės ūkio akademij

Oscillator representation of effective NN potentials

Nuo 2003 m. ISSN 1648-8504Fizikos katedraTaikomosios informatikos katedraVytauto Didžiojo universiteta

Theoretical and Experimental Study Of NON-Stoichiometric SrRuO3SrRuO_{3}: A Role of oxygen vacancies in electron correlation effects

We present a theoretical and experimental study of the electronic structure of SrRuO3 after introduction of vacancies. Theoretically, the modeling of non-stoichiometric variations of SrRuO3 was performed by removing appropriate atoms or their combinations, whereas in the experiments the annealing treatment at moderate temperatures in ultra-high vacuum was applied. At comparison of the obtained results allows us to draw an important conclusion that the formation of oxygen vacancies may be closely related to the manifestation of strong correlation effects in SrRuO3

Temperature-dependent efficiency droop in AlGaN epitaxial layers and quantum wells

Luminescence efficiency droop has been studied in AlGaN epitaxial layers and multiple quantum wells(MQWs) with different strength of carrier localization in a wide range of temperatures. It is shown that the dominant mechanism leading to droop, i.e., the efficiency reduction at high carrier densities, is determined by the carrier thermalization conditions and the ratio between carrier thermal energy and localization depth. The droop mechanisms, such as the occupation-enhanced redistribution of nonthermalized carriers, the enhancement of nonradiative recombination due to carrier delocalization, and excitation-enhanced carrier transport to extended defects or stimulated emission, are discussed