83 research outputs found
Inlist files for "Detectability of axisymmetric magnetic fields from the core to the surface of oscillating post-main sequence stars"
No full text<p>Concerned article: "Detectability of axisymmetric magnetic fields from the core to the surface of oscillating post-main sequence stars" by Bhattacharya et al. (submitted).<br>Corresponding author: Shatanik Bhattacharya</p>
<p>Inlists for the proof-of-concept stellar models used in this project have been provided here for reproducibility.</p>
<p>For the red-giant model, the inlist was executed with MESA version r22.05.1 and MESA-SDK version x86 64-linux-22.6.1. Model 500 (age 4.056 Gyr) was used as the RG in this project.</p>
<p>For the sub-giant models, the inlist was executed with MESA version r23.05.1 and MESA-SDK version x86 64-linux-22.6.1. Models 345 (age 3.624 Gyr) and 350 (age 3.702 Gyr) were used as the MSG and LSG models respectively.</p>
Synthesis and Functionalization of Carbon and Sulfur-based Nanomaterials: Physical Properties and Molecular Recognition
No full textIn recent years carbon-based nanomaterials are growing rapidly in the field of science and technology, due to the tunable optical and physical properties such as electronic arrangement, photostability, flexibility and excellent biocompatibility. Considering, the emerging materials of carbon family such as graphene, graphene oxide (GO) and it derivative, carbon nanotube, fullerene, covalent organic framework (COF) carbon nitride (g-C3N4) and carbon dots (C-Dots) has been highlighted. Based on their structure and morphology, the carbon-based materials have received immense interest in the fields of catalysis, electronic, photonic devices, sensors, molecular recognition and biomedical applications. At the same time, it is also reported that the tunable size and shape of the materials (extended -conjugation, state of oxidation etc.) has shown significant attention in antibacterial activity, relative molar extinction coefficient and cellular internalization, molecular recognition etc. Hence this chapter has shortly provided the literature background of preparation and applications of carbon-based materials. Further information regarding synthesis of different type of carbon and sulfur-based luminescent materials and their functionalization are reported in the literature. Finally, a stack of literature reports towards the materials and biological applications such as biomolecular recognition, cellular imaging, sensing and stimuli responsive systems
Design of fractional-N frequency synthesizer for 2.4/5 GHz wireless local area network
No full textFrequency synthesizers are widely being used for generating local oscillators for majority of RF, wireless, communication, and navigation systems for the last few decades. Phase-locked-loops (PLL) on the other hand are one of the fundamental portions of any digital/mixed-signal devices in addition to the previously mentioned systems. In this thesis work, a PLL based fractional-N frequency synthesizer for 2.4 GHz and 5 GHz wireless local area network (WLAN) in 0.18 μm CMOS-RF process has been proposed. With the adoption of a MASH 1-1-1 delta-sigma modulator facilitating fractional division ratios through a programmable divider, the frequency synthesizer differs from its integer-N counterpart in its higher reference frequency, wider loop bandwidth, faster settling time, and better phase noise and suppression of spurious tones. The synthesizer consists of several blocks, including a wide range LC-tuned voltage controlled oscillator (VCO), divide by 16 – 252 programmable divider, dead-zone free phase-frequency detector (PFD), low mismatch high swing cascode charge pump (CP), 3rd order loop filter (LF), and a 3rd order MASH delta-sigma modulator (DSM)—all of which have been designed and constructed in both transistor and layout levels. SPICE (BSIM3) level simulations have been performed for all the individual blocks as well as the complete frequency synthesizer for extracting transient, DC, periodic-steady-state, and phase-noise analyses results. Overall, with 1.2 V supply voltage, the 0.628 mm X 0.594 mm fractional-N frequency synthesizer achieves “locked” state in approximately 2 μs and produces approximately -111 dBc/Hz phase noise at 1 MHz offset (excluding the MASH modulator) while consuming about 20.76 mW of power.M.S.Includes bibliographical referencesby Subrata Debnat
Interaction of Amino Acids and Graphene Oxide: Trends in Thermodynamic Properties
No full textRecent
studies on interaction of graphene oxide with proteins and
peptides has attracted a lot of attention in biomedical applications.
Hence, fundamental and experimental estimation of binding thermodynamics
between various amino acids and graphene oxide is highly significant
for many aspects. In this study, the interaction of graphene oxide
(GO) with amino acids bearing variable charge, hydrophobicity, and
aromatic moieties are studied by using isothermal titration calorimetry.
To explore the effect of lateral size and degree of oxidation in GO,
we employ two different sizes of GO. The results show that the interactions
of GO with amino acids are mainly governed by electrostatic and π–π
interaction with variable enthalpy and entropy values. The highest
complex stability is observed in the case of tryptophan and arginine
followed by other amino acids containing either positive charge or
aromatic moieties. Amino acids bearing other functional groups either
exhibit very weak interaction or did not show any detectable binding.
This trend and origin of interaction is further confirmed by zeta
potential (for cationic amino acids) and fluorescence titration assay
(for aromatic amino acids). Furthermore, there is a significant enthalpy–entropy
correlation between GO and amino acids that is observed with near
unit slope (α = 0.87) and positive intercept (TΔS0 = 18.65). This indicates the
flexible nature of GO as a receptor against small molecules. In the
future, this investigation will help in designing the peptide-based
receptors for GO and understanding the nature of the interaction of
proteins and peptides with GO-based receptors
Roles of Edges and Surfaces of Graphene Oxide in Molecular Recognition of Proteins: Implications for Enzymatic Inhibition of α‑Chymotrypsin
No full textMany
biomedical applications of graphene oxide (GO) rely on GO–biomolecular
interactions. These interactions can be tuned in two ways: (1) by
controlling surface/edge ratio via tuning the lateral size and (2)
through selective functionalization of edges or surfaces of GO. To
probe this concept, we have prepared four different sizes of GO samples
with variable lateral diameters to investigate the effect of surface/edge
ratio of GO in protein surface binding. We have also examined the
selective functionalization of GO either on edges or surfaces for
biomolecular interactions. α-Chymotrypsin was used as a model
protein, and activity assays were performed to analyze the role of
surface and edges of GO in protein surface interactions. The results
show that with increasing size, the inhibitory efficiency of GO was
increased, most likely due to an increasing surface-to-charge ratio.
We have also observed that surface-functionalized GO shows higher
inhibitory efficiency compared to edge-functionalized GO with similar
amino acid–based functionality. Furthermore, the activity can
be tuned depending on the amino acid side chains of functionalized
GO, for which charge and hydrophobicity play the crucial role. Analysis
of the kinetics indicates that the inhibition occurred through a reversible
competitive binding with no effect on the protein’s secondary
structure. This modified GO can be used for other biomedical applications
such as sensing, targeted delivery, etc. depending on the alteration
of size and functionality or both of GO
Empirical Correlation and Validation of Lateral Size-Dependent Absorption Coefficient of Graphene Oxides
No full textEmpirical Correlation and Validation of Lateral Size-Dependent Absorption Coefficient of Graphene Oxides
No full textFor various applications of graphene oxide (GO), fast and accurate concentration determination of a GO solution is highly important and plays a very crucial role in many applications. One of the most convenient method to determine concentration of an unknown solution is by using absorption coefficient of the specific material by using UV-Vis absorption spectroscopy. In this study we have determined the absorption coefficient of various GO solutions with average lateral size distribution from 40 nm to 7760 nm and successfully able to correlate them. The absorption coefficient of those samples were measured at 660 nm using UV-Vis absorption spectroscopy. A linear relationship between the logarithm of absorption coefficient and average lateral diameter was observed by considering values from both AFM and DLS analysis. The empirical relation was further validated by estimating the concentration of unknown GO solutions and applied them in study of GO mediated enzymatic inhibition. Hence this calibrated relationship can be used in a very convenient way for concentration or average size determination of an unknown GO solution
Using air pollution health risk assessment for future land use planning in Korba, India
No full textHealth effects of air pollution are investigated to provide an impetus for implementation of air pollution mitigation strategies and policies and estimation of benefits for the same. The present paper demonstrates the use of human health data as a guide for urban land use planning at the Korba planning area located in the state of Chhattisgarh in India. Korba is identified as the fifth most polluting city in India based on the Comprehensive Environmental Pollution Index (CEPI) by the Central Pollution Control Board (CPCB) of India. The major contributors to the high levels of suspended particulate matter (SPM) and respiratory suspended particulate matter (RSPM) in the city are the thermal power plants, abandoned and operating fly ash dykes/bunds and the three open-cast coal mines at Gevra, Kusmunda and Dipka. A detail cross-sectional household survey was conducted in the Korba planning area (KPA) on incidence of diseases commonly linked with air pollution as an alternative to measuring the ambient air quality at multiple locations and to understand the severity of the problem at the same time. Analyzing the data spatially (ward wise) showed that the air pollution related disease morbidity rate for certain wards were found to be much higher than the national average. These wards were then checked for their proximity to the different thermal power plants, ash dykes etc. and their location in conjunction with the prevailing wind direction. The results of this analysis indicated the severity of the problems of air pollution (measured by incidence of different air pollution related diseases) at different distances and directions from the existing identified contributors of air pollution. This was finally used to formulate strategies for air pollution reduction and spatial planning of future land use and residential area allocation at the Korba planning area.http://enviroinfo.eu/sites/default/files/pdfs/vol6919/0151.pd
Macroanatomy and 3-dimensional modeling of the tentacular head of Phascolosoma arcuatum (Grey, 1828)
No full textAbstract: The macroanatomy of the tentacular head of Phascolosoma arcuatum belongs to phylum Sipuncula has been studied under light microscopic methods and computer aided graphics analysis. The tentacular head structure has been reconstructed using computer aided graphics analysis using series histological images on computer aided software platform. The P. arcuatum has only five, semitransparent, pigmented, lobed tentacles in tentacular crown with large tentacular coelomic connections. We found that the tentacles are lined by ciliated columnar epithelium with large number of mucosecretory cells, indicating their deposit feeding habit. Fewer number of tentacles, body wall and there burrowing habit supports there integumentary breathing habit. A thick striated collar encircles the tentacles forming the ventral wall of the mouth channel and protects tentacles from mechanical damage when retracted. These structural peculiarities revealed from macroanatomical analysis are strongly suggestive about the important role of the collar region of the tentacular crown of the head of P. arcuatum in relation to its burrowing habit to its concern habitat.
Keywords: Phascolosoma arcuatum, Deposit feeding, Tentacular Introvert, Anatomical modeling.
Title: Macroanatomy and 3-dimensional modeling of the tentacular head of Phascolosoma arcuatum (Grey, 1828)
Author: Biplab Mahata, Amalesh Choudhury, Subrata Kumar De
International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
Vol. 6, Issue 3, July - September 2018
Page : 294-298
Publisher: Research Publish Journals
Available at: www.researchpublish.com
DOI: https://doi.org/10.5281/zenodo.6523454
Published Date: 20-August-2018
Paper Download Link: https://www.researchpublish.com/upload/book/Macro%20anatomy-6267.pdf
Research Article Details link: https://www.researchpublish.com/papers/macro-anatomy-and-3-dimentional-modeling-of-the-tentacular-head-of-phascolosoma-arcuatum-grey-1828International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
Vol. 6, Issue 3, July - September 2018
Page : 294-298
Publisher: Research Publish Journals
Available at: www.researchpublish.co
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