Search Within
Filtros aplicados
Exibindo 1-30 of 133 resultados for "


" no prazo de Papéis
J A Molina et al.
Journal of neural transmission (Vienna, Austria : 1996), 109(7-8), 1035-1044 (2002-07-12)
Thiamine is an essential cofactor for several important enzymes involved in brain oxidative metabolism, such as the alpha-ketoglutarate dehydrogenase complex (KGDHC), pyruvate-dehydrogenase complex (PDHC), and transketolase. Some investigators reported decreased thiamine-diphosphate levels and decreased activities of KGDHC, pyruvate-dehydrogenase complex and
Blanche Collin et al.
Environmental pollution (Barking, Essex : 1987), 187, 22-30 (2014-01-15)
We examined copper (Cu) absorption, distribution and toxicity and the role of a silicon (Si) supplementation in the bamboo Phyllostachys fastuosa. Bamboos were maintained in hydroponics for 4 months and submitted to two different Cu (1.5 and 100 μm Cu(2+)) and
Pil Ju Ko et al.
Journal of nanoscience and nanotechnology, 13(4), 2451-2460 (2013-06-15)
The physical properties of porous materials are being exploited for a wide range of applications including optical biosensors, waveguides, gas sensors, micro capacitors, and solar cells. Here, we review the fast, easy and inexpensive electrochemical anodization based fabrication porous silicon
Jian-ping Jia et al.
Chinese medical journal, 117(8), 1161-1164 (2004-09-14)
An important aspect of Alzheimer's disease (AD) is loss or impairment of cholinergic neurons. It is controversial whether there is a similar cholinergic impairment and cerebral deficit of acetylcholine (ACh) in the case of vascular dementia (VD). The purpose of
Daniel Fine et al.
Advanced healthcare materials, 2(5), 632-666 (2013-04-16)
This manuscript constitutes a review of several innovative biomedical technologies fabricated using the precision and accuracy of silicon micro- and nanofabrication. The technologies to be reviewed are subcutaneous nanochannel drug delivery implants for the continuous tunable zero-order release of therapeutics
Seungil Park et al.
Journal of nanoscience and nanotechnology, 13(5), 3397-3402 (2013-07-19)
We investigated the thin film growths of hydrogenated silicon by hot-wire chemical vapor deposition with different flow rates of SiH4 and H2 mixture ambient and fabricated thin film solar cells by implementing the intrinsic layers to SiC/Si heterojunction p-i-n structures.
Jaewoo Lee et al.
Journal of nanoscience and nanotechnology, 13(5), 3495-3499 (2013-07-19)
A spin-casting process for fabricating polycrystalline silicon sheets for use as solar cell wafers is proposed, and the parameters that control the sheet thickness are investigated. A numerical study of the fluidity of molten silicon indicates that the formation of
M L Selley et al.
Neurobiology of aging, 23(3), 383-388 (2002-04-18)
There is evidence that increased blood concentrations of homocysteine may be a risk factor for Alzheimer's disease. (E)-4-hydroxy-2-nonenal (HNE) is a neurotoxic product of lipid peroxidation that is increased in the ventricular fluid and brains of patients with Alzheimer's disease.
Hye Jin Kwon et al.
Journal of nanoscience and nanotechnology, 13(5), 3417-3421 (2013-07-19)
The rapidly solidified Si-xTiNi (x = 0.2-0.45) alloy ribbons were fabricated via melt spinning process. The thickness of the melt-spun ribbons was about 12.5 microm, and the sound section was selected for the experiment. The microstructures of the ribbons were
M A Lovell et al.
Archives of neurology, 58(3), 392-396 (2001-03-20)
Markers of oxidative stress are increased in cerebrospinal fluid (CSF) of patients with Alzheimer disease (AD), although none of those reported are appropriate diagnostic markers because of the overlap between patients with AD and control subjects. To determine the ratio
Dominique Collard
Frontiers in bioscience (Elite edition), 5, 955-965 (2013-06-12)
In modern life, technologies enabling detection of biological molecules at a low threshold, for health and ecological concerns, are in high demand. Directly interrogating the molecules is a promising direction to clarify the noisy response of conventional assays arising from
Bomin Cho et al.
Journal of nanoscience and nanotechnology, 14(7), 4832-4836 (2014-04-25)
Asymmetric porous silicon multilayer (APSM)-based optical biosensor was developed to specify human Immunoglobin G (Ig G). APSM chip was generated by an electrochemical etching of silicon wafer using an asymmetric electrode configuration in aqueous ethanolic HF solution and constituted with
C Syburra et al.
Ukrains'kyi biokhimichnyi zhurnal (1999 ), 71(3), 112-115 (1999-12-28)
It is well known that brain and nervous system cells are prone to oxidative damage because of their relatively low content of antioxidants, especially enzymatic ones, and of the high levels of both membrane polyunsaturated fatty acids (PUFA) and iron
A H Reshak et al.
Progress in biophysics and molecular biology, 113(2), 327-332 (2013-10-22)
The potential of solar cells have not been fully tapped due to the lack of energy conversion efficiency. There are three important mechanisms in producing high efficiency cells to harvest solar energy; reduction of light reflectance, enhancement of light trapping
Taiuk Rim et al.
Journal of nanoscience and nanotechnology, 14(1), 273-287 (2014-04-16)
The interest in biologically sensitive field effect transistors (BioFETs) is growing explosively due to their potential as biosensors in biomedical, environmental monitoring and security applications. Recently, adoption of silicon nanowires in BioFETs has enabled enhancement of sensitivity, device miniaturization, decreasing
Tetsurou Odatsu et al.
American journal of dentistry, 26(1), 51-55 (2013-06-04)
To investigate the effect of surface polishing and finishing methods on the surface roughness of restorative ceramics. Disk specimens were prepared from feldspar-based, lithium disilicate-based, fluorapatite leucite-based and zirconia ceramics. Four kinds of surface polishing/finishing methods evaluated were: Group 1:
Anthony J Giuffre et al.
Proceedings of the National Academy of Sciences of the United States of America, 110(23), 9261-9266 (2013-05-22)
Calcified skeletons are produced within complex assemblages of proteins and polysaccharides whose roles in mineralization are not well understood. Here we quantify the kinetics of calcite nucleation onto a suite of high-purity polysaccharide (PS) substrates under controlled conditions. The energy
Jong Jin Song et al.
Journal of nanoscience and nanotechnology, 13(5), 3413-3416 (2013-07-19)
The phase change due to varying content of titanium in Si-Ni-xTi alloys and its effect on the electrochemical behavior has been investigated. Specimens were prepared by melt-spinning to reduce the microstructure scale. Results showed that silicon particles of 50-100 nm
Mao Ye et al.
Proceedings of the National Academy of Sciences of the United States of America, 110(38), E3631-E3639 (2013-09-05)
Although the function of silicon (Si) in plant physiology has long been debated, its beneficial effects on plant resistance against abiotic and biotic stresses, including insect herbivory, have been well documented. In addition, the jasmonate (JA) signaling pathway plays a
Tae-Sik Cho et al.
Journal of nanoscience and nanotechnology, 13(5), 3480-3482 (2013-07-19)
Modified embedded atom method-molecular dynamics simulations have been performed to define the various growth facets at the interfaces of Au catalyzed-silicon nanowires (SiNWs). The interfacial growth facet of Au/SiNW on c-Si (111) surface has a single, planar interface, that grows
S R Shetty et al.
The European journal of prosthodontics and restorative dentistry, 21(3), 98-104 (2013-11-23)
An in-vitro study was conducted to assess wetting characteristic of four brands of addition silicon materials subjected to immersion disinfection using four different disinfectants. Among the non-disinfected specimens, the lowest contact angle was recorded for Aquasil ultra (21.63), followed by
Michael J Cowley et al.
Nature chemistry, 5(10), 876-879 (2013-09-24)
In organic chemistry, compounds with adjacent alkene and carbene functionalities (vinyl carbenes) are studied widely as fleeting intermediates and in the coordination sphere of transition metals. Stable derivatives of vinyl carbenes remain elusive, including the corresponding heavier group 14 homologues.
Xiaodong Pi et al.
Physical review letters, 111(17), 177402-177402 (2013-11-12)
We present tight-binding calculations in the random-phase approximation of the optical response of Silicon nanocrystals (Si NCs) ideally doped with large concentrations of phosphorus (P) atoms. A collective response of P-induced electrons is demonstrated, leading to localized surface plasmon resonance
Jacob Raber et al.
Radiation research, 181(4), 362-368 (2014-03-29)
The space radiation environment consists of multiple species of high-energy charge particles (HZE), including (56)Fe and (28)Si nuclei, that may impact neuronal cells, but their damaging effects on the central nervous system (CNS) have been poorly defined. Hippocampus-dependent memory functions
Toshihiko Iwahashi et al.
Nihon Jibiinkoka Gakkai kaiho, 116(11), 1220-1225 (2014-01-09)
It is hard to cure dacryocystitis caused by a paranasal sinus mucocele with treatment which only targets the mucocele. Also, it is difficult to identify the lacrimal sac and the nasolacrimal duct preoperatively and intraoperatively when the lacrimal passage is
Hyunhui Kim et al.
Journal of nanoscience and nanotechnology, 13(5), 3559-3563 (2013-07-19)
Silicon sheets were fabricated by a new fabricating method, spin casting with various rotation speeds of the graphite mold. The microstructure of spin-cast silicon sheets were investigated using an electron probe microanalyzer (EPMA) and scanning electron microscope/electron backscatter diffraction/orientation image
Valerio Leoni et al.
Clinical chemistry and laboratory medicine, 42(2), 186-191 (2004-04-06)
24S-Hydroxycholesterol (24OHC) and 27-hydroxycholesterol (27OHC) are two structurally similar oxysterols of different origins--the former almost exclusively formed in the brain and the latter formed to a lesser extent in the brain than in most other organs. HYPOTHESIS TO BE TESTED:
J-M Serot et al.
Journal of neurology, neurosurgery, and psychiatry, 76(11), 1585-1587 (2005-10-18)
Homocysteine may be involved in the pathogenesis of late onset Alzheimer's disease. It is implicated in the metabolism of several important pathways in the brain. Methylmalonic acid (MMA) is related to the metabolism of branched chained amino acids and fatty
Atteq ur Rehman et al.
TheScientificWorldJournal, 2013, 470347-470347 (2014-01-25)
The p-type crystalline silicon wafers have occupied most of the solar cell market today. However, modules made with n-type crystalline silicon wafers are actually the most efficient modules up to date. This is because the material properties offered by n-type
F H Nielsen
The Journal of nutrition, 126(9 Suppl), 2377S-2385S (1996-09-01)
The term ultratrace elements, often used to indicate elements with an established, estimated or suspected requirement generally indicated by microgram/, could be applied to at least 20 elements. The quality of experimental evidence for nutritional essentiality varies widely for the
Página 1 de 5
Página 1 de 5