Magnetic nanoparticles of ε-Fe1.76 Ga0.24 O3 with the volume-weighted mean size of 17 nm were prepared by thermal treatment of a mesoporous silica template impregnated with metal nitrates and were coated with silica shell of four different thicknesses in the range 6-24 nm. The bare particles exhibited higher magnetization than the undoped compound, 22.4 Am2 kg-1 at 300 K, and were characterized by blocked state with the coercivity of 1.2 T at 300 K, being thus the very opposite of superparamagnetic iron oxides. The relaxometric study of the silica-coated samples at 0.47 T revealed promising properties for MRI, specifically, transverse relaxivity of 89-168 s-1 mmol(f.u.)-1 L depending on the shell thickness was observed. We investigated the effects of the silica-coated nanoparticles on human A549 and MCF-7 cells. Cell viability, proliferation, cell cycle distribution, and the arrangement of actin cytoskeleton were assessed, as well as formation and maturation of focal adhesions. Our study revealed that high concentrations of silica-coated particles with larger shell thicknesses of 16-24 nm interfere with the actin cytoskeletal networks, inducing thus morphological changes. Consequently, the focal adhesion areas were significantly decreased, resulting in impaired cell adhesion.

• Klíčová slova
• Ga-doped iron(III) oxide, cytoskeleton, cytotoxicity, epsilon polymorph, transverse relaxivity,
• MeSH
• buněčný cyklus účinky léků   MeSH
• buňky A549 MeSH
• cytoskelet účinky léků   metabolismus   MeSH
• galium chemie   farmakologie   MeSH
• lidé MeSH
• magnetické nanočástice oxidů železa chemie   MeSH
• MFC-7 buňky MeSH
• oxid křemičitý chemie   farmakologie   MeSH
• viabilita buněk účinky léků   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• galium MeSH
• oxid křemičitý MeSH

A marked increase of relaxivity has been observed upon rigidifying the internal frame of Gd-containing PAMAM dendrimers: the effect has been attained by either protonation of the dendrimer or by forming supramolecular adducts with cationic polyaminoacids.

• MeSH
• dendrimery MeSH
• gadolinium chemie   MeSH
• heterocyklické sloučeniny monocyklické chemie   MeSH
• molekulární struktura MeSH
• organokovové sloučeniny chemie   MeSH
• polyaminy chemie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• 1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetraacetic acid MeSH Prohlížeč
• dendrimery MeSH
• gadolinium MeSH
• heterocyklické sloučeniny monocyklické MeSH
• organokovové sloučeniny MeSH
• PAMAM Starburst MeSH Prohlížeč
• polyaminy MeSH

Disclosed here are a piperazine, a pyridine, and two carboxylate groups containing pentadentate ligand H2pmpa and its corresponding water-soluble Mn(II) complex (1). DFT-based structural optimization implied that the complex had pentagonal bipyramidal geometry where the axial positions were occupied by two water molecules, and the equatorial plane was constituted by the ligand ON3O donor set. Thus, a bis(aquated) disc-like Mn(II) complex has been synthesized. The complex showed higher stability compared with Mn(II)-EDTA complex [log KMnL = 14.29(3)] and showed a very high r1 relaxivity value of 5.88 mM-1 s-1 at 1.41 T, 25 °C, and pH = 7.4. The relaxivity value remained almost unaffected by the pH of the medium in the range of 6-10. Although the presence of 200 equiv of fluoride and bicarbonate anions did not affect the relaxivity value appreciably, an increase in the value was noticed in the presence of phosphate anion due to slow tumbling of the complex. Cell viability measurements, as well as phantom MR images using clinical MRI imager, consolidated the possible candidature of complex 1 as a positive contrast agent.

• MeSH
• gadolinium chemie   farmakologie   MeSH
• HeLa buňky MeSH
• komplexní sloučeniny chemická syntéza   chemie   farmakologie   MeSH
• koncentrace vodíkových iontů MeSH
• kontrastní látky chemická syntéza   chemie   farmakologie   MeSH
• kvantová teorie MeSH
• lidé MeSH
• magnetická rezonanční tomografie * MeSH
• mangan chemie   farmakologie   MeSH
• molekulární struktura MeSH
• viabilita buněk účinky léků   MeSH
• vztah mezi dávkou a účinkem léčiva MeSH
• vztahy mezi strukturou a aktivitou MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• gadolinium MeSH
• komplexní sloučeniny MeSH
• kontrastní látky MeSH
• mangan MeSH

A new phosphinic-acid DOTA-like ligand, DO3AP(BP), containing a geminal bis(phosphonic acid) moiety as a highly effective bone-seeking group, was synthesized in high yield. Its crystal structure was determined by X-ray analysis. Complexation with lanthanide(iii) ions occurs under mild conditions (pH = 8-9, 25 degrees C, 2-3 h). (1)H, (31)P, and (17)O NMR spectroscopy show that DO3AP(BP) forms nine-coordinated lanthanide(iii) complexes with one water molecule in the first coordination sphere except for Ln = Er-Lu, which have in addition a species without lanthanide(iii)-bound water. Selective formation of only two diastereomers (out of four possible) suggests that the coordinated phosphinate phosphorus atom occurs exclusively in one of the enantiomeric forms. The ratio of the twisted square antiprism (TSA) and square antiprism (SA) diastereomers changes along the lanthanide series; the gadolinium(iii) complex has about 35% of the TSA species. The bis(phosphonate) moiety remains free for anchoring to osseous tissue. The (1)H longitudinal relaxivity of the Gd-DO3AP(BP) complex (r(1) = 7.4 s(-1) mM(-1), 20 MHz, 25 degrees C, pH = 7.5) is unexpectedly high compared to that of other monohydrated chelates of similar size thanks to a significant contribution from the second hydration sphere. The water residence time tau(M)(298) is 198 ns. Further increase in the relaxivity was observed in the presence of Zn(ii), Mg(ii) or Ca(ii) ions, due to formation of coordination polymers. Slowing down of the tumbling rate of the Gd-DO3AP(BP) complex upon adsorption on hydroxyapatite also leads to an increase of the relaxivity (r(1) = 17 s(-1) mM(-1), 20 MHz, 25 degrees C, pH = 7.5).

• MeSH
• chelátory chemie   MeSH
• diagnostické zobrazování metody   MeSH
• gadolinium chemie   MeSH
• heterocyklické sloučeniny monocyklické chemie   MeSH
• hydroxyapatit chemie   MeSH
• kalcinóza * diagnostické zobrazování   patologie   radioterapie   MeSH
• kontrastní látky chemie   MeSH
• kosti a kostní tkáň cytologie   metabolismus   MeSH
• krystalografie rentgenová MeSH
• lanthanoidy chemie   MeSH
• molekulární struktura MeSH
• organofosfonáty chemie   MeSH
• rentgendiagnostika MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• 1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetraacetic acid MeSH Prohlížeč
• chelátory MeSH
• gadolinium MeSH
• heterocyklické sloučeniny monocyklické MeSH
• hydroxyapatit MeSH
• kontrastní látky MeSH
• lanthanoidy MeSH
• organofosfonáty MeSH

Chronic sympathetic nervous system overactivity has been implicated in the pathogenesis of both hypertension and hypercholesterolemia. We conducted a controlled trial to determine the effect of a relaxation technique on blood pressure and serum cholesterol in drug free subjects with normal and slightly elevated values. Over the follow-up period, highly significant reductions in blood pressure and serum cholesterol levels were noted in relaxation group subjects while control group subjects showed no significant changes. These results suggest that relaxation therapy may contribute to the management of individuals with mild hypertension and/or mild hypercholesterolemia.

• MeSH
• dospělí MeSH
• hypercholesterolemie patofyziologie   terapie   MeSH
• hypertenze patofyziologie   terapie   MeSH
• klinické zkoušky jako téma MeSH
• lidé MeSH
• relaxační terapie * MeSH
• sympatický nervový systém patofyziologie   MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky kontrolované MeSH
• klinické zkoušky MeSH

BACKGROUND AND PURPOSE: Gadobenate dimeglumine (MultiHance) has higher r1 relaxivity than gadoterate meglumine (Dotarem) which may permit the use of lower doses for MR imaging applications. Our aim was to compare 0.1- and 0.05-mmol/kg body weight gadobenate with 0.1-mmol/kg body weight gadoterate for MR imaging assessment of brain tumors. MATERIALS AND METHODS: We performed crossover, intraindividual comparison of 0.1-mmol/kg gadobenate with 0.1-mmol/kg gadoterate (Arm 1) and 0.05-mmol/kg gadobenate with 0.1-mmol/kg gadoterate (Arm 2). Adult patients with suspected or known brain tumors were randomized to Arm 1 (70 patients) or Arm 2 (107 patients) and underwent 2 identical examinations at 1.5 T. The agents were injected in randomized-sequence order, and the 2 examinations were separated by 2-14 days. MR imaging scanners, imaging sequences (T1-weighted spin-echo and T1-weighted high-resolution gradient-echo), and acquisition timing were identical for the 2 examinations. Three blinded readers evaluated images for diagnostic information (degree of definition of lesion extent, lesion border delineation, visualization of lesion internal morphology, contrast enhancement) and quantitatively for percentage lesion enhancement and lesion-to-background ratio. Safety assessments were performed. RESULTS: In Arm 1, a highly significant superiority (P < .002) of 0.1-mmol/kg gadobenate was demonstrated by all readers for all end points. In Arm 2, no significant differences (P > .1) were observed for any reader and any end point, with the exception of percentage enhancement for reader 2 (P < .05) in favor of 0.05-mmol/kg gadobenate. Study agent-related adverse events were reported by 2/169 (1.2%) patients after gadobenate and by 5/175 (2.9%) patients after gadoterate. CONCLUSIONS: Significantly superior morphologic information and contrast enhancement are demonstrated on brain MR imaging with 0.1-mmol/kg gadobenate compared with 0.1-mmol/kg gadoterate. No meaningful differences were recorded between 0.05-mmol/kg gadobenate and 0.1-mmol/kg gadoterate.

• MeSH
• dospělí MeSH
• klinické křížové studie MeSH
• kontrastní látky MeSH
• lidé středního věku MeSH
• lidé MeSH
• magnetická rezonanční tomografie metody   MeSH
• meglumin analogy a deriváty   MeSH
• nádory mozku patologie   MeSH
• organokovové sloučeniny MeSH
• senioři MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• gadobenic acid MeSH Prohlížeč
• gadoterate meglumine MeSH Prohlížeč
• kontrastní látky MeSH
• meglumin MeSH
• organokovové sloučeniny MeSH

Sleep and light education (SLE) combined with relaxation is a potential method of addressing sleep and affective problems in older people. 47 participants took part in a four-week sleep education program. SLE was conducted once a week for 60-90 minutes. Participants were instructed on sleep and light hygiene, sleep processes, and practiced relaxation techniques. Participants were wearing actigraphs for 6 weeks, completed daily sleep diaries, and wore blue light-blocking glasses 120 minutes before bedtime. Measures included scores of the Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Insomnia Severity Index (ISS), Beck Depression Inventory-II (BDI-II), State-Trait Anxiety Inventory (STAI) and actigraphy measurements of sleep latency, sleep efficiency, and sleep fragmentation. Sleep quality increased after SLE based on the subjective assessment and in the objective measurement with actigraphy. PSQI scores were statistically reduced indicating better sleep. Scores after the intervention significantly decreased in ESS and ISS. Sleep latency significantly decreased, whereas sleep efficiency and fragmentation index (%), did not improve. Mood significantly improved after SLE, with lower scores on the BDI-II and STAI. SLE combined with relaxation proved to be an effective method to reduce sleep problems and the incidence of depressive and anxiety symptoms.

• Klíčová slova
• Sleep hygiene, actigraph, education, light hygiene, senior sleep,
• MeSH
• afekt * fyziologie   MeSH
• aktigrafie MeSH
• cirkadiánní rytmus fyziologie   MeSH
• deprese MeSH
• kvalita spánku MeSH
• lidé středního věku MeSH
• lidé MeSH
• relaxace fyziologie   MeSH
• relaxační terapie metody   MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• spánek * fyziologie   MeSH
• světlo MeSH
• úzkost MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

• Klíčová slova
• MUSCLE RELAXANTS *,
• MeSH
• centrálně působící myorelaxancia * MeSH
• lidé MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• centrálně působící myorelaxancia * MeSH

• MeSH
• autogenní trénink MeSH
• chování MeSH
• dospělí MeSH
• hypercholesterolemie psychologie   MeSH
• hypertenze psychologie   MeSH
• lidé středního věku MeSH
• lidé MeSH
• osobní uspokojení MeSH
• osobnost MeSH
• pracovní lékařství * MeSH
• relaxace * MeSH
• relaxační terapie MeSH
• únava psychologie   MeSH
• zaměstnanci - hodnocení výkonnosti MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

The porosity of differently wetted carbonaceous material with disordered mesoporosity was investigated using low-field 1H NMR relaxometry. Spin−spin relaxation (relaxation time T2) was measured using the CPMG pulse sequence. We present a non-linear optimization method for the conversion of relaxation curves to the distribution of relaxation times by using non-specialized software. Our procedure consists of searching for the number of components, relaxation times, and their amplitudes, related to different types of hydrogen nuclei in the sample wetted with different amounts of water (different water-to-carbon ratio). We found that a maximum of five components with different relaxation times was sufficient to describe the observed relaxation. The individual components were attributed to a tightly bounded surface water layer (T2 up to 2 ms), water in small pores especially supermicropores (2 < T2 < 7 ms), mesopores (7 < T2 < 20 ms), water in large cavities between particles (20−1500 ms), and bulk water surrounding the materials (T2 > 1500 ms). To recalculate the distribution of relaxation times to the pore size distribution, we calculated the surface relaxivity based on the results provided by additional characterization techniques, such as thermoporometry (TPM) and N2/−196 °C physisorption.

• Klíčová slova
• low-field NMR relaxometry, mesopores, porosity, relaxation time, relaxivity,
• Publikační typ
• časopisecké články MeSH