keyword
MENU ▼
Read by QxMD icon Read
search

Si

keyword
https://www.readbyqxmd.com/read/28655220/self-catalyzed-growth-of-vertical-gasb-nanowires-on-inas-stems-by-metal-organic-chemical-vapor-deposition
#1
Xianghai Ji, Xiaoguang Yang, Tao Yang
We report the first self-catalyzed growth of high-quality GaSb nanowires on InAs stems using metal-organic chemical vapor deposition (MOCVD) on Si (111) substrates. To achieve the growth of vertical InAs/GaSb heterostructure nanowires, the two-step flow rates of the trimethylgallium (TMGa) and trimethylantimony (TMSb) are used. We first use relatively low TMGa and TMSb flow rates to preserve the Ga droplets on the thin InAs stems. Then, the flow rates of TMGa and TMSb are increased to enhance the axial growth rate...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28654847/a-model-comparison-approach-to-trauma-related-guilt-as-a-mediator-of-the-relationship-between-ptsd-symptoms-and-suicidal-ideation-among-veterans
#2
Katherine C Cunningham, Chloe Farmer, Stefanie T LoSavio, Paul A Dennis, Carolina P Clancy, Michael A Hertzberg, Claire F Collie, Patrick S Calhoun, Jean C Beckham
BACKGROUND: Suicidal ideation (SI) is a serious issue affecting U.S. veterans, and those with posttraumatic stress disorder (PTSD) are at an especially high risk of SI. Guilt has been associated with both PTSD and SI and may therefore be an important link between these constructs. METHODS: The present study compared models of trauma-related guilt and used path analysis to examine the direct and indirect effects of PTSD and trauma-related guilt on SI among a sample of 988 veterans receiving outpatient PTSD treatment at a Veterans Affairs (VA) specialty clinic...
June 21, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28654293/optical-emission-in-hexagonal-sige-nanowires
#3
Xavier Cartoixa, Maurizia Palummo, Håkon Ikaros Teddy Hauge, Erik P A M Bakkers, Riccardo Rurali
Recent advances in the synthetic growth of nanowires have given access to crystal phases that in bulk are only observed under extreme pressure conditions. Here, we use first-principles methods based on density functional theory and many-body perturbation theory to show that a suitable mixing of hexagonal Si and hexagonal Ge yields a direct bandgap with an optically permitted transition. Comparison of the calculated radiative lifetimes with typical values of non-radiative recombination mechanisms indicates that optical emission will be the dominant recombination mechanism...
June 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28654013/in-vitro-anti-leishmanial-activity-of-essential-oils-extracted-from-vietnamese-plants
#4
Thanh Binh Le, Claire Beaufay, Duc Trong Nghiem, Marie-Paule Mingeot-Leclercq, Joëlle Quetin-Leclercq
Leishmania mexicana is one of the pathogens causing cutaneous leishmaniasis which is associated with patient morbidity. In our researches for new safe and effective treatments, thirty-seven essential oils (EOs) extracted from Vietnamese plants were screened in vitro for the first time on Leishmania mexicana mexicana(Lmm) promastigotes at the maximum concentration of 50 nL/mL. Active EOs were also analyzed for cytotoxicity on mammalian cell lines (WI38, J774) and their selectivity indices (SI) were calculated...
June 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28654012/i-v-and-c-v-characterization-of-a-high-responsivity-graphene-silicon-photodiode-with-embedded-mos-capacitor
#5
Giuseppe Luongo, Filippo Giubileo, Luca Genovese, Laura Iemmo, Nadia Martucciello, Antonio Di Bartolomeo
We study the effect of temperature and light on the I-V and C-V characteristics of a graphene/silicon Schottky diode. The device exhibits a reverse-bias photocurrent exceeding the forward current and achieves a photoresponsivity as high as 2.5 A / W . We show that the enhanced photocurrent is due to photo-generated carriers injected in the graphene/Si junction from the parasitic graphene/SiO₂/Si capacitor connected in parallel to the diode. The same mechanism can occur with thermally generated carriers, which contribute to the high leakage current often observed in graphene/Si junctions...
June 27, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28653987/the-emerging-role-of-zfp217-in-adipogenesis
#6
Hong Xiang, Zhu-Xia Zhong, Yong-Dong Peng, Si-Wen Jiang
Zinc finger protein 217 (Zfp217), a member of the krüppel-type zinc finger protein family, plays diverse roles in cell differentiation and development of mammals. Despite extensive research on the functions of Zfp217 in cancer, pluripotency and reprogramming, its physiological roles in adipogenesis remain unknown. Our previous RNA sequencing data suggest the involvement of Zfp217 in adipogenesis. In this study, the potential function of Zfp217 in adipogenesis was investigated through bioinformatics analysis and a series of experiments...
June 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28653663/engineering-the-thermal-conductivity-along-an-individual-silicon-nanowire-by-selective-helium-ion-irradiation
#7
Yunshan Zhao, Dan Liu, Jie Chen, Liyan Zhu, Alex Belianinov, Olga S Ovchinnikova, Raymond R Unocic, Matthew J Burch, Songkil Kim, Hanfang Hao, Daniel S Pickard, Baowen Li, John T L Thong
The ability to engineer the thermal conductivity of materials allows us to control the flow of heat and derive novel functionalities such as thermal rectification, thermal switching and thermal cloaking. While this could be achieved by making use of composites and metamaterials at bulk length-scales, engineering the thermal conductivity at micro- and nano-scale dimensions is considerably more challenging. In this work, we show that the local thermal conductivity along a single Si nanowire can be tuned to a desired value (between crystalline and amorphous limits) with high spatial resolution through selective helium ion irradiation with a well-controlled dose...
June 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28652890/silver-deposition-onto-modified-silicon-substrates
#8
Yichen Duan, Sana Rani, Yuying Zhang, Chaoying Ni, John T Newberg, Andrew V Teplyakov
Trimethylphosphine(hexafluoroacetylacetonato)silver(I) was used as a precursor to deposit silver onto silicon surfaces. The deposition was performed on silicon-based substrates including silica, H-terminated Si(100), and OH-terminated (oxidized) Si(100). The deposition processes at room temperature and elevated temperature (350 °C) were compared. The successful deposition resulted in nanostructures or nanostructured films as confirmed by atomic force microscopy (AFM) and scanning electron microscopy (SEM) with metallic silver being the majority deposited species as confirmed by X-ray photoelectron spectroscopy (XPS)...
April 6, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28652802/comparison-of-quadrapolar%C3%A2-radiofrequency-lesions-produced-by-standard-versus-modified-technique-an-experimental-model
#9
Ramin Safakish
Lower back pain (LBP) is a global public health issue and is associated with substantial financial costs and loss of quality of life. Over the years, different literature has provided different statistics regarding the causes of the back pain. The following statistic is the closest estimation regarding our patient population. The sacroiliac (SI) joint pain is responsible for LBP in 18%-30% of individuals with LBP. Quadrapolar™ radiofrequency ablation, which involves ablation of the nerves of the SI joint using heat, is a commonly used treatment for SI joint pain...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28652747/disrupted-small-world-brain-functional-network-topology-in-male-patients-with-severe-obstructive-sleep-apnea-revealed-by-resting-state-fmri
#10
Li-Ting Chen, Xiao-Le Fan, Hai-Jun Li, Si Nie, Hong-Han Gong, Wei Zhang, Xian-Jun Zeng, Ping Long, De-Chang Peng
PURPOSE: Obstructive sleep apnea (OSA) is a common sleep-related breathing disorder that can damage cognitive function. However, the functional network organization remains poorly understood. The aim of this study was to investigate the topological properties of OSA patients using a graph theoretical analysis. PATIENTS AND METHODS: A total of 30 male patients with untreated severe OSA and 25 male education- and age-matched good sleepers (GSs) underwent functional magnetic resonance imaging (MRI) examinations...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28652641/high-precision-deformation-mapping-in-finfet-transistors-with-two-nanometre-spatial-resolution-by-precession-electron-diffraction
#11
David Cooper, Nicolas Bernier, Jean-Luc Rouvière, Yun-Yu Wang, Weihao Weng, Anita Madan, Shogo Mochizuki, Hemanth Jagannathan
Precession electron diffraction has been used to systematically measure the deformation in Si/SiGe blanket films and patterned finFET test structures grown on silicon-on-insulator type wafers. Deformation maps have been obtained with a spatial resolution of 2.0 nm and a precision of ±0.025%. The measured deformation by precession diffraction for the blanket films has been validated by comparison to energy dispersive x-ray spectrometry, X-Ray diffraction, and finite element simulations. We show that although the blanket films remain biaxially strained, the patterned fin structures are fully relaxed in the crystallographic planes that have been investigated...
May 29, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28652623/automatic-inhibitory-function-in-the-human-somatosensory-and-motor-cortices-an-meg-mrs-study
#12
Chia-Hsiung Cheng, Shang-Yueh Tsai, Chia-Yih Liu, David M Niddam
While the automatic inhibitory function of the human cerebral cortex has been extensively investigated by means of electrophysiological recordings, the corresponding modulating neurochemical mechanisms remain unclear. We aimed to examine whether the primary somatosensory (SI) and primary motor cortical (MI) inhibitory function is associated with endogenous GABA levels. Eighteen young participants received paired-pulse and single-pulse electrical stimulation to the median nerve during magnetoencephalographic recordings...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28652621/silicon-amendment-is-involved-in-the-induction-of-plant-defense-responses-to-a-phloem-feeder
#13
Lang Yang, Yongqiang Han, Pei Li, Fei Li, Shahbaz Ali, Maolin Hou
Plant resistance to herbivores is a key component in integrated pest management. In most cases, silicon (Si) amendment to plants enhances resistance to herbivorous insects. The increase of plant physical barrier and altered insect behaviors are proposed as mechanisms for the enhanced resistance in Si-amended plants, but our understanding of the induced mechanisms involved in Si-enhanced plant resistance to phloem-feeding insects remains unclear. Here, we show that Si amendment to rice (Oryza sativa) plants impacts multiple plant defense responses induced by a phloem-feeder, the brown planthopper (Nilaparvata lugens, BPH)...
June 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28652425/evaluation-of-biological-activity-of-mastic-extracts-based-on-chemotherapeutic-indices
#14
Ryuichiro Suzuki, Hiroshi Sakagami, Shigeru Amano, Kunihiko Fukuchi, Katsuyoshi Sunaga, Taisei Kanamoto, Shigemi Terakubo, Hideki Nakashima, Yoshiaki Shirataki, Mineko Tomomura, Yoshiko Masuda, Satoshi Yokose, Akito Tomomura, Hirofumi Watanabe, Masaki Okawara, Yoshiharu Matahira
BACKGROUND: Most previous mastic investigators have not considered its potent cytotoxicity that may significantly affect the interpretation of obtained data. In the present study, we re-evaluated several biological activities of mastic extracts, based on chemotherapeutic indexes. MATERIALS AND METHODS: Pulverized mastic gum was extracted with n-hexane and then with ethyl acetate or independently with methanol or n-butanol. Tumor specificity (TS) of the extracts was determined by their cytotoxicity against human malignant and non-malignant cells...
July 2017: In Vivo
https://www.readbyqxmd.com/read/28651642/a-pilot-randomized-controlled-trial-of-acupuncture-at-the-si-guan-xue-for-cancer-pain
#15
To-Yi Lam, Li-Ming Lu, Wai-Man Ling, Li-Zhu Lin
BACKGROUND: Pain is a common symptom in cancer patients. Acupuncture is a suggested treatment for a wide range of clinical conditions, usually for its beneficial effects on pain control. Si guan xue (the four points) have been widely used in clinical practice, and has shown that it is highly effective, effective in obtaining qi, shows strong acupuncture stimulation, and is simple to manipulate and safe to use. Therefore, the aim of this study is to test the protocol and safety of acupuncture at the si guan xue in the management of cancer pain...
June 26, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28651475/high-frequency-ventilation-modalities-as-salvage-therapy-for-smoke-inhalation-associated-acute-lung-injury-a-systematic-review
#16
Andrew C Miller, Paula A Ferrada, Sameer S Kadri, Krupa Nataraj-Bhandari, Amir Vahedian-Azimi, Sadeq A Quraishi
BACKGROUND: Smoke inhalation-associated acute lung injury (SI-ALI) is a major cause of morbidity and mortality in victims of fire tragedies. To date, there are no evidence-based guidelines on ventilation strategies in acute respiratory distress syndrome (ARDS) after smoke inhalation. We reviewed the existing literature for clinical studies of salvage mechanical ventilation (MV) strategies in patients with SI-ALI, focusing on mortality and pneumonia as outcomes. METHODS: A systematic search was designed in accordance with preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/28651386/optical-and-electrical-characteristics-of-silicon-nanowires-prepared-by-electroless-etching
#17
Sabar D Hutagalung, Mohammed M Fadhali, Raed A Areshi, Fui D Tan
Silicon nanowires (SiNWs) were fabricated by the electroless etching of an n-type Si (100) wafer in HF/AgNO3. Vertically aligned and high-density SiNWs are formed on the Si substrates. Various shapes of SiNWs are observed, including round, rectangular, and triangular. The recorded maximum reflectance of the SiNWs is approximately 19.2%, which is much lower than that of the Si substrate (65.1%). The minimum reflectance of the SiNWs is approximately 3.5% in the near UV region and 9.8% in the visible to near IR regions...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28651339/formation-of-silica-aggregates-in-sorghum-root-endodermis-is-predetermined-by-cell-wall-architecture-and-development
#18
Milan Soukup, Michal Martinka, Dragana Bosnic, Mária Caplovicová, Rivka Elbaum, Alexander Lux
Background and Aims: Deposition of silica in plant cell walls improves their mechanical properties and helps plants to withstand various stress conditions. Its mechanism is still not understood and silica-cell wall interactions are elusive. The objective of this study was to investigate the effect of silica deposition on the development and structure of sorghum root endodermis and to identify the cell wall components involved in silicification. Methods: Sorghum bicolor seedlings were grown hydroponically with (Si+) or without (Si-) silicon supplementation...
June 22, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28651143/elemental-migration-and-characterization-of-products-during-hydrothermal-liquefaction-of-cornstalk
#19
Zhangbing Zhu, Buchun Si, Jianwen Lu, Jamison Watson, Yuanhui Zhang, Zhidan Liu
Biofuel production from lignocellulosic biomass through hydrothermal liquefaction (HTL) is a promising direction. This study characterized the products and investigated the elemental migration during the HTL of cornstalk at seven different operation temperatures (210-375°C). The biocrude oil yield significantly increased from 7.04% (210°C) to 23.32% (290°C) as the temperature increased, and decreased to 21.07% when further increased to 375°C. A carbon recovery of 11.03-38.69%, and a hydrogen recovery of 7...
June 19, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28650984/clinical-characteristics-of-second-primary-pancreatic-cancer
#20
Jung Hyun Jo, In Rae Cho, Jang Han Jung, Hee Seung Lee, Moon Jae Chung, Seungmin Bang, Seung Woo Park, Jae Bock Chung, Si Young Song, Jeong Youp Park
PURPOSE: Several studies reported the increased risk of second primary pancreatic ductal adenocarcinoma (2nd PDAC) in cancer survivors. However, data on the characteristics of 2nd PDAC are insufficient. METHODS: This retrospective cohort study included 1759 patients with PDAC. They were classified as having 2nd PDAC or first primary PDAC (1st PDAC) according to a prior diagnosed cancer of different origin, at least 6 months before PDAC diagnosis. RESULTS: There were 110 patients (6...
2017: PloS One
keyword
keyword
58023
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"