Hypokinesia in adolescents

Title: Hypokinesia in adolescents Objectives: The main target is, to find out how frequent and extensive the hypokinesis appears in terms of the exploratory subject. We mainly search for the relationship of high school adolescents to the physical activities, how often it's being practicised and in which kind of environment. Methods: In order to prove my thesis, we decided to use a long version of international standardized IPAQ questionnaire translated to the czech language. The exploratory sample consisted of 46 high school adolescent students. The results were afterwards analysed according to the basic statistic principles. Subsequently we compared the quantity of physical activity between boys and girls during seven days of the research. Results: The results of research apparently meet the criteria of the sufficient count of teenager activities. In the average the sample was evaluated as moderately active individuals in both gender types. Despite the negative public image in terms of quantity of youth physical activities, the actual rate meets general requirements. Boys reached the rate of 1333,8 MET- min/week, girls reached the count of 2013,9 MET-min/week. Keywords: adolescence, physical activity, lack of exercise, lifestyl

Polymeric Perturbation to the Magnetic Relaxations of the <i>C</i>_2<i>v</i>-Symmetric [Er(Cp)₂(OBu)₂]⁻ Anion

To test the coordination symmetry effect on the magnetization-reversal barrier trend of Er^III-based single-ion magnets, the <i>C</i>_2<i>v</i>-symmetric organolanthanide anion [Er­(Cp)₂(O^<i>t</i>Bu)₂]⁻ has been incorporated with different countercations, resulting in two structures, namely, the discrete [K₂(Cp)­(18-C-6)₂]­[Er­(Cp)₂(O^<i>t</i>Bu)₂] (<b>1</b>) and the polymeric [ErK₂(Cp)₃(O^<i>t</i>Bu)₂(THF)₂]_n (<b>2</b>), where 18-C-6 = 18-crown-6 ether and Cp = cyclopentadienide. Surprisingly, the polymeric <b>2</b> exhibits much stronger field-induced magnetization relaxing behavior compared to the monomeric <b>1</b>. Such disparate dynamic magnetism is attributable to the subtle coordination environmental perturbations of the central Er^III ions

Polymeric Perturbation to the Magnetic Relaxations of the <i>C</i>_2<i>v</i>-Symmetric [Er(Cp)₂(OBu)₂]⁻ Anion

To test the coordination symmetry effect on the magnetization-reversal barrier trend of Er^III-based single-ion magnets, the <i>C</i>_2<i>v</i>-symmetric organolanthanide anion [Er­(Cp)₂(O^<i>t</i>Bu)₂]⁻ has been incorporated with different countercations, resulting in two structures, namely, the discrete [K₂(Cp)­(18-C-6)₂]­[Er­(Cp)₂(O^<i>t</i>Bu)₂] (<b>1</b>) and the polymeric [ErK₂(Cp)₃(O^<i>t</i>Bu)₂(THF)₂]_n (<b>2</b>), where 18-C-6 = 18-crown-6 ether and Cp = cyclopentadienide. Surprisingly, the polymeric <b>2</b> exhibits much stronger field-induced magnetization relaxing behavior compared to the monomeric <b>1</b>. Such disparate dynamic magnetism is attributable to the subtle coordination environmental perturbations of the central Er^III ions

Facile Large-Scale Synthesis of Urea-Derived Porous Graphitic Carbon Nitride with Extraordinary Visible-Light Spectrum Photodegradation

We report the large-scale synthesis of porous graphitic carbon nitride (g-C₃N₄) in a direct heat treatment process by controlling the thermal condensation temperature of the low-cost urea precursor. An excellent linear relation between the yield of the urea-derived porous g-C₃N₄ (U-g-C₃N₄) and the input urea was experimentally demonstrated, and consequently, a large-scale yield >50 g in a batch was readily achieved. A series of morphology and structure characterizations revealed the actual evolutionary process of the temperature-dependent porous architecture of U-g-C₃N₄ and its inherent superiority. Furthermore, we demonstrated the extraordinary visible-light-driven photodegradation activity of large-scale U-g-C₃N₄ toward organic pollutants such as rhodamine B, safranine T, and α-naphthol. Such superior photodegradation performance and long-term photocatalytic stability, together with a scalable preparation method, may render as-fabricated U-g-C₃N₄ as a promising candidate for practical application in environmental remediation

Redox-Active Cobalt(II/III) Metal–Organic Framework for Selective Oxidation of Cyclohexene

We report herein a new cobalt­(II/III) mixed-valence metal–organic framework formulated as [Co^IICo₂^III(μ₃-O)­(bdc)₃(tpt)]·guest <b>1</b>, where bdc = benzene-1,4-dicarboxylate and tpt = 2,4,6-tri­(4-pyridinyl)-1,3,5-triazine, which can be used as a redox-active heterogeneous catalyst for selective oxidation of cyclohexene on the allylic position without destroying the adjacent double bond. Two oxidants were chosen to demonstrate this result. For using <i>tert</i>-butyl hydroperoxide, the conversion rate is 63% and only allylic oxidation products (<i>tert</i>-butyl-2-cyclohexenyl-1-peroxide, 86%; 2-cyclohexen-1-one, 14%) are found, whereas if using O₂ as oxidant, a total conversion of 38% is achieved and also only the allylic oxidation products (cyclohexenyl hydroperoxide, 72%; 2-cyclohexen-1-one, 20%; and cyclohex-2-en-1-ol, 8%) are found. The absence of any adduct on the double bond may be due to the unique radical chain mechanism triggered by the mixed-valent [Co^IICo₂^III(μ₃-O)] centers

Redox-Active Cobalt(II/III) Metal–Organic Framework for Selective Oxidation of Cyclohexene

We report herein a new cobalt­(II/III) mixed-valence metal–organic framework formulated as [Co^IICo₂^III(μ₃-O)­(bdc)₃(tpt)]·guest <b>1</b>, where bdc = benzene-1,4-dicarboxylate and tpt = 2,4,6-tri­(4-pyridinyl)-1,3,5-triazine, which can be used as a redox-active heterogeneous catalyst for selective oxidation of cyclohexene on the allylic position without destroying the adjacent double bond. Two oxidants were chosen to demonstrate this result. For using <i>tert</i>-butyl hydroperoxide, the conversion rate is 63% and only allylic oxidation products (<i>tert</i>-butyl-2-cyclohexenyl-1-peroxide, 86%; 2-cyclohexen-1-one, 14%) are found, whereas if using O₂ as oxidant, a total conversion of 38% is achieved and also only the allylic oxidation products (cyclohexenyl hydroperoxide, 72%; 2-cyclohexen-1-one, 20%; and cyclohex-2-en-1-ol, 8%) are found. The absence of any adduct on the double bond may be due to the unique radical chain mechanism triggered by the mixed-valent [Co^IICo₂^III(μ₃-O)] centers

Fine Tuning Ag(I)–Sb(III) Hybrid Iodides for Light Detection

Lead-free hybrid double perovskite iodides (HDPIs) have piqued increasing research interest due to their environmental friendliness and high stability. However, such antimony-based HDPIs with strong photocurrent response are currently very limited. Here, we successfully design and construct five Ag(I)–Sb(III)-based HDPIs using two types of cyclic aliphatic amines as A-site templates. Interestingly, these Ag(I)–Sb(III) HDPIs exhibit relatively narrow band gaps, preferred orientation, and high stability after being processed into thin films on the indium tin oxide (ITO) substrate. Notably, under illuminations of a xenon lamp, all HDPIs exhibit considerable photocurrent responses, reaching a maximum difference of 17 μA·cm–2 for ASI 1, which is the highest among lead-free halogen-based organic–inorganic hybrid compounds to date. Combining the considerable photocurrents and the high stability, the optoelectronic applications of two-dimensional Ag(I)–Sb(III) HDPIs can be expected

Fine Tuning Ag(I)–Sb(III) Hybrid Iodides for Light Detection

Lead-free hybrid double perovskite iodides (HDPIs) have piqued increasing research interest due to their environmental friendliness and high stability. However, such antimony-based HDPIs with strong photocurrent response are currently very limited. Here, we successfully design and construct five Ag(I)–Sb(III)-based HDPIs using two types of cyclic aliphatic amines as A-site templates. Interestingly, these Ag(I)–Sb(III) HDPIs exhibit relatively narrow band gaps, preferred orientation, and high stability after being processed into thin films on the indium tin oxide (ITO) substrate. Notably, under illuminations of a xenon lamp, all HDPIs exhibit considerable photocurrent responses, reaching a maximum difference of 17 μA·cm–2 for ASI 1, which is the highest among lead-free halogen-based organic–inorganic hybrid compounds to date. Combining the considerable photocurrents and the high stability, the optoelectronic applications of two-dimensional Ag(I)–Sb(III) HDPIs can be expected

Fine Tuning Ag(I)–Sb(III) Hybrid Iodides for Light Detection

Lead-free hybrid double perovskite iodides (HDPIs) have piqued increasing research interest due to their environmental friendliness and high stability. However, such antimony-based HDPIs with strong photocurrent response are currently very limited. Here, we successfully design and construct five Ag(I)–Sb(III)-based HDPIs using two types of cyclic aliphatic amines as A-site templates. Interestingly, these Ag(I)–Sb(III) HDPIs exhibit relatively narrow band gaps, preferred orientation, and high stability after being processed into thin films on the indium tin oxide (ITO) substrate. Notably, under illuminations of a xenon lamp, all HDPIs exhibit considerable photocurrent responses, reaching a maximum difference of 17 μA·cm–2 for ASI 1, which is the highest among lead-free halogen-based organic–inorganic hybrid compounds to date. Combining the considerable photocurrents and the high stability, the optoelectronic applications of two-dimensional Ag(I)–Sb(III) HDPIs can be expected

Fine Tuning Ag(I)–Sb(III) Hybrid Iodides for Light Detection

Lead-free hybrid double perovskite iodides (HDPIs) have piqued increasing research interest due to their environmental friendliness and high stability. However, such antimony-based HDPIs with strong photocurrent response are currently very limited. Here, we successfully design and construct five Ag(I)–Sb(III)-based HDPIs using two types of cyclic aliphatic amines as A-site templates. Interestingly, these Ag(I)–Sb(III) HDPIs exhibit relatively narrow band gaps, preferred orientation, and high stability after being processed into thin films on the indium tin oxide (ITO) substrate. Notably, under illuminations of a xenon lamp, all HDPIs exhibit considerable photocurrent responses, reaching a maximum difference of 17 μA·cm–2 for ASI 1, which is the highest among lead-free halogen-based organic–inorganic hybrid compounds to date. Combining the considerable photocurrents and the high stability, the optoelectronic applications of two-dimensional Ag(I)–Sb(III) HDPIs can be expected