5 research outputs found
Anomalous magnetic ordering in PrBa_2Cu_3O_{7-y} single crystals: Evidence for magnetic coupling between the Cu and Pr sublattices
In Al-free PrBa_2Cu_3O_{7-y} single crystals the kink in the temperature
dependence of magnetic susceptibility chi_{ab}(T), connected with Pr
antiferromagnetic ordering, disappears after field cooling (FC) in a field H ||
ab-plane. The kink in chi_c(T) remains unchanged after FC in H || c-axis. As a
possible explanation, freezing of the Cu magnetic moments, lying in the
ab-plane, caused by FC in H || ab, hinders their reorientation and, due to
coupling between the Pr and Cu(2) sublattices, ordering of the Pr^{3+} moments.
A field induced phase transition and a field dependence of the Pr^{3+} ordering
temperature have been found for both H || c and H || ab.Comment: 11 pages (LaTex with elsart.sty), 5 EPS figs. Accepted to Physica
ΠΠΈΡΠ±Π°Π»Π°Π½Ρ ΡΠΈΠ½ΠΊΠ° ΠΈ ΠΌΠ΅Π΄ΠΈ Ρ Π΄Π΅ΡΠ΅ΠΉ Ρ ΡΠΈΠ½Π΄ΡΠΎΠΌΠΎΠΌ Π΄Π΅ΡΠΈΡΠΈΡΠ° Π²Π½ΠΈΠΌΠ°Π½ΠΈΡ ΠΈ Π³ΠΈΠΏΠ΅ΡΠ°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ
The objective of the study was investigation of serum zinc (Zn) and copper (Cu) levels in blood serum, urine, and hair of preschool and primary school aged children with attention deficit/hyperactivity (ADHD) syndrome. A total of 50 children aged 4-9 y.o. with ADHD as well as 50 neurotypical controls were involved in the study. Assessment of serum Zn and Cu levels was performed using ICP-MS. It is demonstrated that children with ADHD are characterized by a significant 8% ( p = 0.001) decrease in serum Zn levels. In the case of hair, copper levels were 16% ( p = 0.039) lower than the control values. Urinary metal concentrations were relatively stable. Serum Cu/Zn ratio in ADHD exceeded the control values by 12% ( p = 0.003). The observed 15% decrease in urinary Cu/Zn ratio was nearly significant ( p = 0.080), being indicative of predominant increase in zinc excretion in comparison to copper. In regression models adjusted for age, gender, body weight and height, hair Zn ( Ξ² = -0.277; p = 0.027) and Cu/Zn ratio ( Ξ² = -0.536; p = 0.008), as well as urinary Zn levels ( Ξ² = 0.418; p = 0.049) were significantly associated with ADHD. Therefore, the obtained data indicate the potential role of zinc deficiency in ADHD, with increased zinc loss being considered as the potential factor leading to reduced Zn status.Π¦Π΅Π»ΡΡ Π½Π°ΡΡΠΎΡΡΠ΅Π³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²ΠΈΠ»ΠΎΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΡΡΠΎΠ²Π½Ρ ΡΠΈΠ½ΠΊΠ° ΠΈ ΠΌΠ΅Π΄ΠΈ Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ, ΠΌΠΎΡΠ΅ ΠΈ Π²ΠΎΠ»ΠΎΡΠ°Ρ
Π΄Π΅ΡΠ΅ΠΉ Ρ ΡΠΈΠ½Π΄ΡΠΎΠΌΠΎΠΌ Π΄Π΅ΡΠΈΡΠΈΡΠ° Π²Π½ΠΈΠΌΠ°Π½ΠΈΡ ΠΈ Π³ΠΈΠΏΠ΅ΡΠ°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ (Π‘ΠΠΠ) Π΄ΠΎΡΠΊΠΎΠ»ΡΠ½ΠΎΠ³ΠΎ ΠΈ ΡΠ°Π½Π½Π΅Π³ΠΎ ΡΠΊΠΎΠ»ΡΠ½ΠΎΠ³ΠΎ Π²ΠΎΠ·ΡΠ°ΡΡΠ°. Π ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΡΠΈΠ½ΡΠ»ΠΈ ΡΡΠ°ΡΡΠΈΠ΅ 50 Π΄Π΅ΡΠ΅ΠΉ Ρ Π‘ΠΠΠ (4-9 Π»Π΅Ρ), Π° ΡΠ°ΠΊΠΆΠ΅ 50 Π·Π΄ΠΎΡΠΎΠ²ΡΡ
Π΄Π΅ΡΠ΅ΠΉ. ΠΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΡΠΈΠ½ΠΊΠ° ΠΈ ΠΌΠ΅Π΄ΠΈ Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ, ΠΌΠΎΡΠ΅ ΠΈ Π²ΠΎΠ»ΠΎΡΠ°Ρ
ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΌΠ°ΡΡ-ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΈΠΈ Ρ ΠΈΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΠΎ-ΡΠ²ΡΠ·Π°Π½Π½ΠΎΠΉ ΠΏΠ»Π°Π·ΠΌΠΎΠΉ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π΄Π΅ΡΠΈ, ΡΡΡΠ°Π΄Π°ΡΡΠΈΠ΅ Π‘ΠΠΠ, Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΡΡ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΠΌ 8% ( p = 0,001) ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΡΡΠΎΠ²Π½Ρ ΡΠΈΠ½ΠΊΠ° Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ. Π£ΡΠΎΠ²Π΅Π½Ρ ΠΌΠ΅Π΄ΠΈ Π² Π²ΠΎΠ»ΠΎΡΠ°Ρ
Π΄Π΅ΡΠ΅ΠΉ Ρ Π‘ΠΠΠ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π»ΡΡ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΠΌ 16% ( p = 0,039) ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΊΠΎΠ½ΡΡΠΎΠ»ΡΠ½ΡΠΌΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΠΌΠΈ. Π‘ΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠ² Π² ΠΌΠΎΡΠ΅ ΡΠ²Π»ΡΠ»ΠΎΡΡ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΠΌ. ΠΠ½Π°ΡΠ΅Π½ΠΈΡ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ Cu/Zn Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ Π‘ΠΠΠ ΠΏΡΠ΅Π²ΡΡΠ°Π»ΠΈ ΠΊΠΎΠ½ΡΡΠΎΠ»ΡΠ½ΡΠ΅ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ Π½Π° 12% ( p = 0,003). ΠΠ°Π±Π»ΡΠ΄Π°Π΅ΠΌΠΎΠ΅ 15%-Π½ΠΎΠ΅ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ Cu/Zn Π² ΠΌΠΎΡΠ΅ ΠΏΡΠΈΠ±Π»ΠΈΠΆΠ°Π»ΠΎΡΡ ΠΊ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎΠΌΡ ( p = 0,080), ΡΡΠΎ ΠΌΠΎΠΆΠ΅Ρ ΡΠ²Π»ΡΡΡΡΡ ΠΎΡΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΡΠΊΡΠΊΡΠ΅ΡΠΈΠΈ ΡΠΈΠ½ΠΊΠ° ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΌΠ΅Π΄ΡΡ. Π ΡΠ΅Π³ΡΠ΅ΡΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠΎΡΠ»Π΅ ΠΏΠΎΠΏΡΠ°Π²ΠΊΠΈ Π½Π° Π²Π°ΡΠΈΠ°Π±Π΅Π»ΡΠ½ΠΎΡΡΡ ΠΏΠΎΠ»Π°, Π²ΠΎΠ·ΡΠ°ΡΡΠ°, ΠΌΠ°ΡΡΡ ΡΠ΅Π»Π° ΠΈ ΡΠΎΡΡΠ° Π΄Π΅ΡΠ΅ΠΉ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΠΈΠ½ΠΊΠ° ( Ξ² = -0,277; p = 0,027) ΠΈ ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ Cu/Zn ( Ξ² = -0,536; p = 0,008) Π² Π²ΠΎΠ»ΠΎΡΠ°Ρ
, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΡΠΎΠ²Π΅Π½Ρ Zn Π² ΠΌΠΎΡΠ΅ ( Ξ² = 0,418; p = 0,049) Π±ΡΠ»ΠΈ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΠΎ ΡΠ²ΡΠ·Π°Π½Ρ Ρ Π½Π°Π»ΠΈΡΠΈΠ΅ΠΌ Π‘ΠΠΠ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠΊΠ°Π·ΡΠ²Π°ΡΡ Π½Π° Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΡ ΡΠΎΠ»Ρ Π΄Π΅ΡΠΈΡΠΈΡΠ° ΡΠΈΠ½ΠΊΠ° Π² ΡΠ°Π·Π²ΠΈΡΠΈΠΈ Π‘ΠΠΠ, ΠΏΡΠΈΡΠ΅ΠΌ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΠ΄Π½ΠΎΠΉ ΠΈΠ· ΠΏΡΠΈΡΠΈΠ½ Π΄Π΅ΡΠΈΡΠΈΡΠ° ΠΌΠΎΠΆΠ΅Ρ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΈΠ½ΡΠ΅Π½ΡΠΈΡΠΈΠΊΠ°ΡΠΈΡ ΡΠΊΡΠΊΡΠ΅ΡΠΈΠΈ ΠΌΠ΅ΡΠ°Π»Π»Π°