The system shows large irreversibility in field-cooling/zero-field-cooling
magnetization curves and much larger coercivity was observed even up to room temperature. Hysteresis loop shift is present when the system is field-cooled from a temperature above the Cr2O3 Neel temperature. We found that the exchange bias field follows a Brillouin type temperature dependence and goes to zero at T-N. These results evidence the enhancement of thermal stability of the Co nanoparticle moments, associated to the increase of anisotropy due to the interface exchange interaction between the ferromagnetic particles and the AFM Cr2O3 matrix. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3259425]“
“Nitric oxide (NO) is an important regulatory molecule for the host defense that plays a fundamental find more role in the cardiovascular, immune, and nervous systems. NO is synthesized through the conversion of l-arginine to l-citrulline by the enzyme NO synthase (NOS), which is found in three isoforms classified as neuronal (nNOS), inducible (iNOS), and endothelial (eNOS). Recent evidence supports the theory that
this bioactive molecule has an influential role in the disruption of normal brain and vascular homeostasis, a condition known to elucidate chronic hypoperfusion which ultimately causes the development of brain lesions and the pathology Stattic molecular weight that typify Alzheimer disease (AD). In addition, vascular NO activity MGCD0103 appears to be a major contributor to this pathology before any overexpression of NOS isoforms is observed in the neuron, glia, and microglia of the brain tree, where the overexpression the NOS isoforms causes the formation of a large amount of NO. We hypothesize that since an imbalance between the NOS isoforms and endothelin-1 (ET-1), a human gene that encodes for blood vessel constriction, can cause antioxidant system insufficiency; by using pharmacological intervention with NO donors and/or NO suppressors, the brain lesions and the downstream
progression of brain pathology and dementia in AD should be delayed or minimized.”
“Surface charge of pyroelectric nature is measured in poled hydroxyapatite ceramics. The average pyroelectric constant can range from 0.1 to 40 nC cm(-2) K-1 at temperatures of 300-500 degrees C, while at 27-60 degrees C the value ranges from 15 to 64 nC cm(-2) K-1. The higher temperature values are comparable to conventional pyroelectric ceramics such as LiTaO3 or PZT. The lower temperature values are four orders higher than those observed in bone and tendon. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3262628]“
“Alzheimer’s disease (AD) and Parkinson’s disease (PD) are the most common causes of dementia and movement disorders in the elderly.