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https://www.readbyqxmd.com/read/28330300/carbon-quantum-dots-shuttle-electrons-to-the-anode-of-a-microbial-fuel-cell
#1
A S Vishwanathan, Kartik S Aiyer, L A A Chunduri, K Venkataramaniah, S Siva Sankara Sai, Govind Rao
Electrodes based on graphite, graphene, and carbon nanomaterials have been used in the anode chamber of microbial fuel cells (MFCs). Carbon quantum dots (C-dots) are a class of versatile nanomaterials hitherto not reported in MFCs. C-dots previously synthesized from coconut husk were reported to possess hydroxyl and carboxyl functional groups on their surface. The presence of these functional groups on a carbon matrix conferred on the C-dots the ability to conduct and transfer electrons. Formation of silver nanoparticles from silver nitrate upon addition of C-dots confirmed their reducing ability...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28325487/media-leadership-change-management
#2
Keith A Grossman, Elliot K Fishman, Karen M Horton, Siva P Raman
No abstract text is available yet for this article.
March 16, 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/28321470/a-novel-selective-deep-eutectic-solvent-extraction-method-for-versatile-determination-of-copper-in-sediment-samples-by-icp-oes
#3
Esra Bağda, Huseyin Altundağ, Mustafa Tüzen, Mustafa Soylak
In the present study, a simple, mono step deep eutectic solvent (DES) extraction was developed for selective extraction of copper from sediment samples. The optimization of all experimental parameters, e.g. DES type, sample/DES ratio, contact time and temperature were performed with using BCR-280 R (lake sediment certified reference material). The limit of detection (LOD) and the limit of quantification (LOQ) were found as 1.2 and 3.97 µg L(-1), respectively. The RSD of the procedure was 7.5%. The proposed extraction method was applied to river and lake sediments sampled from Serpincik, Çeltek, Kızılırmak (Fadl and Tecer region of the river), Sivas-Turkey...
March 20, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28319254/a-bayesian-subgroup-analysis-using-collections-of-anova-models
#4
Jinzhong Liu, Siva Sivaganesan, Purushottam W Laud, Peter Müller
We develop a Bayesian approach to subgroup analysis using ANOVA models with multiple covariates, extending an earlier work. We assume a two-arm clinical trial with normally distributed response variable. We also assume that the covariates for subgroup finding are categorical and are a priori specified, and parsimonious easy-to-interpret subgroups are preferable. We represent the subgroups of interest by a collection of models and use a model selection approach to finding subgroups with heterogeneous effects...
March 20, 2017: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/28318637/impact-of-multiple-en-face-image-averaging-on-quantitative-assessment-from-optical-coherence-tomography-angiography-images
#5
Akihito Uji, Siva Balasubramanian, Jianqin Lei, Elmira Baghdasaryan, Mayss Al-Sheikh, SriniVas R Sadda
PURPOSE: To investigate the impact of multiple en face image averaging on quantitative measurements of the retinal microvasculature using optical coherence tomography angiography (OCTA). DESIGN: Prospective, observational, cross-sectional case series. PARTICIPANTS: Twenty-one healthy individuals with normal eyes. METHODS: Macular OCTA images were acquired from all participants using the Zeiss Cirrus 5000 with Angioplex OCTA software (Carl Zeiss Meditec, Dublin, CA)...
March 16, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28315019/an-endophytic-fungus-gibberella-moniliformis-from-lawsonia-inermis-l-produces-lawsone-an-orange-red-pigment
#6
Hatnagar Sarang, Pijakala Rajani, Madhugiri Mallaiah Vasanthakumari, Patel Mohana Kumara, Ramamoorthy Siva, Gudasalamani Ravikanth, R Uma Shaanker
Lawsone (2-hydroxy-1, 4-napthoquinone), also known as hennotannic acid, is an orange red dye used as a popular skin and hair colorant. The dye is produced in the leaves of Lawsonia inermis L, often referred to as the "henna" tree. In this study, we report the production of lawsone by an endophytic fungus, Gibberella moniliformis isolated from the leaf tissues of Lawsonia inermis. The fungus produced the orange-red dye in potato dextrose agar and broth, independent of the host tissue. Presence of lawsone was confirmed spectrometrically using HPLC and ESI-MS/MS analysis...
March 17, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28314049/biological-evaluation-of-3-hydroxybenzyl-alcohol-an-extrolite-produced-by-aspergillus-nidulans-strain-kzr-132
#7
C Ganesh Kumar, Poornima Mongolla, Sujitha Pombala, Shiva Bandi, K Suresh Babu, Kallaganti Venkata Siva Ramakrishna
AIMS: The aim of the study was to purify and characterize a bioactive compound from Aspergillus nidulans strain KZR-132 and its biological evaluation. METHODS AND RESULTS: A bioactive extolite was purified from Aspergillus nidulans strain KZR-132, and its chemical structure was elucidated as 3-hydroxylbenzyl alcohol (3-HBA) based on (1) H and (13) C NMR, FT-IR and mass spectroscopic analysis. The antimicrobial efficacy of 3-HBA was established against Gram-positive, Gram-negative bacteria and different Candida strains...
March 17, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28301329/improved-photoelectrochemical-performance-of-gan-nanopillar-photoanodes
#8
Parvathala Reddy Narangari, Siva Krishna Karuturi, Mykhaylo Lysevych, Hark Hoe Tan, Chennupati Jagadish
In this work, we report on the photoelectrochemical (PEC) investigation of n-GaN nanopillar (NP) photoanodes fabricated using metal organic chemical vapour deposition and the top-down approach. Substantial improvement in photocurrents is observed for GaN NP photoanodes compared to their planar counterparts. The role of carrier concentration and NP dimensions on the PEC performance of NP photoanodes is further elucidated. Photocurrent density is almost doubled for doped NP photoanodes whereas no improvement is noticed for undoped NP photoanodes...
April 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28299239/variability-of-retinal-thickness-measurements-in-tilted-or-stretched-optical-coherence-tomography-images
#9
Akihito Uji, Nizar Saleh Abdelfattah, David S Boyer, Siva Balasubramanian, Jianqin Lei, SriniVas R Sadda
PURPOSE: To investigate the level of inaccuracy of retinal thickness measurements in tilted and axially stretched optical coherence tomography (OCT) images. METHODS: A consecutive series of 50 eyes of 50 patients with age-related macular degeneration were included in this study, and Cirrus HD-OCT images through the foveal center were used for the analysis. The foveal thickness was measured in three ways: (1) parallel to the orientation of the A-scan (Tx), (2) perpendicular to the retinal pigment epithelium (RPE) surface in the instrument-displayed aspect ratio image (Ty), and (3) thickness measured perpendicular to the RPE surface in a native aspect ratio image (Tz)...
March 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28276142/subgroup-finding-via-bayesian-additive-regression-trees
#10
Siva Sivaganesan, Peter Müller, Bin Huang
We provide a Bayesian decision theoretic approach to finding subgroups that have elevated treatment effects. Our approach separates the modeling of the response variable from the task of subgroup finding and allows a flexible modeling of the response variable irrespective of potential subgroups of interest. We use Bayesian additive regression trees to model the response variable and use a utility function defined in terms of a candidate subgroup and the predicted response for that subgroup. Subgroups are identified by maximizing the expected utility where the expectation is taken with respect to the posterior predictive distribution of the response, and the maximization is carried out over an a priori specified set of candidate subgroups...
March 9, 2017: Statistics in Medicine
https://www.readbyqxmd.com/read/28274409/unraveling-the-inhibition-mechanism-of-cyanidin-3-sophoroside-on-polyphenol-oxidase-and-its-effect-on-enzymatic-browning-of-apples
#11
Hridya Hemachandran, Amrita Anantharaman, Sankari Mohan, Gopalakrishnan Mohan, D Thirumal Kumar, Diksha Dey, Drishty Kumar, Priyanka Dey, Amrita Choudhury, C George Priya Doss, Siva Ramamoorthy
The hunt for anti-browning agents in the food and agricultural industries aims to minimize nutritional loss and prolong post harvest storage. In the present study, the effect of cyanidin-3-sophoroside (CS) from Garcinia mangostana rind, on polyphenol oxidase (PPO) activity was investigated. The non-competitive inhibition mode of CS was determined by Lineweaver Burk plot. CS forms a ground-state complex by quenching the intrinsic fluorescence of PPO. The static quenching was temperature-dependent with an activation energy of 4...
July 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28270966/label-free-fingerprinting-of-tumor-cells-in-bulk-flow-using-inline-digital-holographic-microscopy
#12
Dhananjay Kumar Singh, Caroline C Ahrens, Wei Li, Siva A Vanapalli
Large-scale and label-free phenotyping of cells holds great promise in medicine, especially in cancer diagnostics and prognosis. Here, we introduce inline digital holography microscopy for volumetric imaging of cells in bulk flow and fingerprinting of flowing tumor cells based on two metrics, in-focus scattered intensity and cell diameter. Using planar distribution of immobilized particles, we identify the optimal recording distance and microscope objective magnification that minimizes the error in measurement of particle position, size and scattered intensity...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28268508/extraction-of-medically-interpretable-features-for-classification-of-malignancy-in-breast-thermography
#13
Himanshu Madhu, Siva Teja Kakileti, Krithika Venkataramani, Susmija Jabbireddy
Thermography, with high-resolution cameras, is being re-investigated as a possible breast cancer screening imaging modality, as it does not have the harmful radiation effects of mammography. This paper focuses on automatic extraction of medically interpretable non-vascular thermal features. We design these features to differentiate malignancy from different non-malignancy conditions, including hormone sensitive tissues and certain benign conditions, which have an increased thermal response. These features increase the specificity for breast cancer screening, which had been a long known problem in thermographic screening, while retaining high sensitivity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268379/kurtosis-as-a-statistical-approach-to-identify-the-pivot-point-of-the-rotor
#14
Shivaram P Arunachalam, Elizabeth M Annoni, Siva K Mulpuru, Paul A Friedman, Elena G Tolkacheva
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia that causes stroke affecting more than 2.3 million people in the US. Catheter ablation to terminate AF is successful for paroxysmal AF but suffers limitations with persistent AF patients as current mapping methods cannot identify AF active substrates outside of pulmonary vein region. In this work, we developed a novel Kurtosis based mapping technique that can accurately identify pivot points of the rotors that were induced in ex-vivo isolated rabbit heart...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28263590/phase-transformation-vibrational-and-electronic-properties-of-k2ce-po4-2-a-combined-experimental-and-theoretical-study
#15
Samatha Bevara, Karuna Kara Mishra, Sadeque Jahedkhan Patwe, T R Ravindran, Mayanak K Gupta, Ranjan Mittal, P Siva Ram Krishna, Anil K Sinha, S Nagabhusan Achary, Avesh Kumar Tyagi
Herein we report the high-temperature crystal chemistry of K2Ce(PO4)2 as observed from a joint in situ variable-temperature X-ray diffraction (XRD) and Raman spectroscopy as well as ab initio density functional theory (DFT) calculations. These studies revealed that the ambient-temperature monoclinic (P21/n) phase reversibly transforms to a tetragonal (I41/amd) structure at higher temperature. Also, from the experimental and theoretical calculations, a possible existence of an orthorhombic (Imma) structure with almost zero orthorhombicity is predicted which is closely related to tetragonal K2Ce(PO4)2...
March 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28261711/one-pot-synthesis-of-%C3%AE-%C3%AE-epoxy-ketones-through-domino-reaction-between-alkenes-and-aldehydes-catalyzed-by-proline-based-chiral-organocatalysts
#16
Veeramanoharan Ashokkumar, Ayyanar Siva
Proline based metal free organocatalysts were developed by using a new approach for the synthesis of epoxide derivatives through a domino reaction. This domino reaction (oxidative coupling) allows a direct access to epoxides from various alkenes and aldehydes through C-H functionalization and C-C/C-O bond formation. The catalytic efficiencies of the newly synthesized organocatalysts were also determined by domino reaction in the presence of various functional groups containing aldehyde and alkene derivatives with very good yields (up to 95%) and ee's (up to 99%)...
March 6, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28261424/healing-process-of-osteonecrotic-lesions-of-the-femoral-head-following-transtrochanteric-rotational-osteotomy-a-computed-tomography-based-study
#17
Devendra Lakhotia, Siva Swaminathan, Won Yong Shon, Jong Keon Oh, Jun Gyu Moon, Chirayu Dwivedi, Suk Joo Hong
BACKGROUND: Transtrochanteric rotational osteotomy (TRO) is a controversial hip-preserving procedure with a variable success rate. The healing process of femoral head osteonecrosis after TRO has been poorly explained till now. This study aimed to evaluate the healing process of previously transposed necrotic lesion after a TRO for nontraumatic osteonecrosis of the femoral head using computed tomography (CT). METHODS: Among 52 patients (58 hips) who had preserved original femoral head after TRO, we retrospectively reviewed 27 patients (28 hips) who had undergone sequential CT scans and had no major complication following TRO...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28254485/a-robust-synthesis-of-functionalized-2h-indazoles-via-solid-state-melt-reaction-ssmr-and-their-anti-tubercular-activity
#18
Shinde Vidyacharan, Chandan Adhikari, Vagolu Siva Krishna, Rudraraju Srilakshmi Reshma, Dharmarajan Sriram, Duddu S Sharada
A facile and convenient approach has been developed for the synthesis of functionalized indazoles via solid state melt reaction using easily accessible starting materials under catalyst-free conditions. This transformation involves electrocyclization via a conjugated nitrene intermediate obtained under thermal conditions. Further anti-tubercular activity screening of the molecules was undertaken, among the compounds 3a-3x screened for in vitro antimycobacterial activity against Mycobacterium tuberculosis H37Rv, compound 3u (MIC: 4...
April 1, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28254292/rapid-sensing-of-melamine-in-milk-by-interference-green-synthesis-of-silver-nanoparticles
#19
S Varun, S C G Kiruba Daniel, Sai Siva Gorthi
A highly sensitive, selective, and rapid interference green synthesis based determination of potential milk adulterant melamine has been reported here. Melamine is a nitrogenous compound added to milk for mimicking proteins, consumption of which leads to kidney stones and renal failures. Melamine interacts with ascorbic acid (AA) through strong hydrogen-bonding interactions, thus resulting in an interference/interruption in the formation of silver (Ag) nanoparticles which was confirmed by UV-Vis spectroscopy and Transmission Electron Microscopy (TEM)...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28250588/fast-recovery-of-transgenic-submergence-tolerant-rice-cultivars-of-north-east-india-by-early-co-cultivation-of-agrobacterium-with-pre-cultured-callus
#20
Van Cuu Nguyen, Van Khiem Nguyen, Chongtham Henary Singh, Guruaribam Shantibala Devi, Vanga Siva Reddy, Sadhu Leelavathi
Agro-climatic conditions of North-East India are very complex and rice cultivars present in the region have been adapted to grow under harsh environmental conditions. Germplasm present in the region is considered to possess several important and unique traits that are of importance in rice improvement programs. Genetic engineering is a powerful tool to introduce new traits into crop plants. However, not much information is available on the methods to introduce foreign genes into North-East rice cultivars. Therefore, the main objective of this study is to develop transformation procedures for fast recovery of transgenic plants from North-East rice cultivars...
January 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
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