Methods for identification, quantification and characterization of polyhydroxyalkanoates

2016 ◽  
Vol 5 (04) ◽  
pp. 4977 ◽  
Author(s):  
Suchitra Godbole
Keyword(s):  
Process Development ◽  
Quantitative Estimation ◽  
Molecular Weight Determination ◽  
Similar Material ◽  
Storage Material ◽  
Spectrophotometric Methods ◽  
Advantages And Disadvantages ◽  
Recent Developments ◽  
Energy Storage Material

Polyhydroxyalkanoates (PHAs) are the polymers of hydroxyalkanoates that accumulate as a carbon/energy storage material in various microorganisms. PHAs have been attracting considerable attention as biodegradable substitutes for conventional polymers, because of their similar material properties to conventional plastics. A number of review articles on the general features of PHAs, the physiology, genetics and molecular biology, the development of PHAs having novel monomer constituents, production processes, biodegradation of PHAs are available. Recently much effort has been devoted to develop a process for the economical production of PHAs. The isolation, analysis and characterization of PHAs are important factors for any process development. A number of methods have been developed for the analysis of PHAs. This paper is an effort to compile the methods available for the identification, quantitative estimation and characterization of PHAs. The methods described in this paper include- staining reactions, spectrophotometric methods, infrared and FTIR spectroscopy, HPLC, gas chromatography and GC-MS analysis, NMR spectroscopy, flow cytometry and spectrofluorometry, molecular weight determination and thermal analysis. The methods have been discussed with their advantages and disadvantages. Recent developments in the analysis of PHAs have also been discussed.

Thermophysical characterization of a by-product from the steel industry to be used as a sustainable and low-cost thermal energy storage material

Energy ◽  
2015 ◽  
Vol 89 ◽  
pp. 601-609 ◽  
Author(s):  
Iñigo Ortega-Fernández ◽  
Nicolas Calvet ◽  
Antoni Gil ◽  
Javier Rodríguez-Aseguinolaza ◽  
Abdessamad Faik ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Steel Industry ◽  
Low Cost ◽  
Storage Material ◽  
Energy Storage Material ◽  
Thermal Energy Storage Material ◽  
Thermophysical Characterization

scholarly journals Electrochemical synthesis and characterization of poly(o-toluidine) as high energy storage material

2019 ◽  
Vol 317 ◽  
pp. 746-752 ◽  
Author(s):  
Milica M. Gvozdenović ◽  
Braninir Z. Jugović ◽  
Bojan M. Jokić ◽  
Enis S. Džunuzović ◽  
Braninimir N. Grgur
Keyword(s):  
Energy Storage ◽  
Electrochemical Synthesis ◽  
High Energy ◽  
Synthesis And Characterization ◽  
Storage Material ◽  
Energy Storage Material ◽  
High Energy Storage

scholarly journals Characterization of an ettringite-based thermochemical energy storage material in an open-mode reactor

2021 ◽  
Vol 33 ◽  
pp. 102159
Author(s):  
B. Chen ◽  
K. Johannes ◽  
M. Horgnies ◽  
V. Morin ◽  
F. Kuznik
Keyword(s):  
Energy Storage ◽  
Storage Material ◽  
Energy Storage Material

Characterization of Unfilled Tungsten Plugs on a 0.35μm CMOS Multilevel Metallization Process

1996 ◽  
Author(s):  
H. Sur ◽  
S. Bothra ◽  
Y. Strunk ◽  
J. Hahn
Keyword(s):  
Process Development ◽  
Process Integration ◽  
Wafer Level ◽  
Electrical Failure ◽  
Analysis Techniques ◽  
Integration Approach ◽  
Intermetal Dielectric ◽  
Metallization Process ◽  
Section Analysis

Abstract An investigation into metallization/interconnect failures during the process development phase of an advanced 0.35μm CMOS ASIC process is presented. The corresponding electrical failure signature was electrical shorting on SRAM test arrays and subsequently functional/Iddq failures on product-like test vehicles. Advanced wafer-level failure analysis techniques and equipment were used to isolate and identify the leakage source as shorting of metal lines due to tungsten (W) residue which was originating from unfilled vias. Further cross-section analysis revealed that the failing vias were all exposed to the intermetal dielectric spin-on glass (SOG) material used for filling the narrow spaces between metal lines. The outgassing of the SOG in the exposed regions of the via prior to and during the tungsten plug deposition is believed to be the cause of the unfilled vias. This analysis facilitated further process development in eliminating the failure mechanism and since then no failures of this nature have been observed. The process integration approach used to eliminate the failure is discussed.

Neurochemistry of L-Glutamate Transport in the CNS: A Review of Thirty Years of Progress

2001 ◽  
Vol 66 (9) ◽  
pp. 1315-1340 ◽  
Author(s):  
Vladimir J. Balcar ◽  
Akiko Takamoto ◽  
Yukio Yoneda
Keyword(s):  
Molecular Biology ◽  
Glutamate Transport ◽  
Mammalian Brain ◽  
Activity Data ◽  
System A ◽  
Recent Developments ◽  
The Central Nervous System ◽  
Health And Disease ◽  
Disease Analysis

The review highlights the landmark studies leading from the discovery and initial characterization of the Na+-dependent "high affinity" uptake in the mammalian brain to the cloning of individual transporters and the subsequent expansion of the field into the realm of molecular biology. When the data and hypotheses from 1970's are confronted with the recent developments in the field, we can conclude that the suggestions made nearly thirty years ago were essentially correct: the uptake, mediated by an active transport into neurons and glial cells, serves to control the extracellular concentrations of L-glutamate and prevents the neurotoxicity. The modern techniques of molecular biology may have provided additional data on the nature and location of the transporters but the classical neurochemical approach, using structural analogues of glutamate designed as specific inhibitors or substrates for glutamate transport, has been crucial for the investigations of particular roles that glutamate transport might play in health and disease. Analysis of recent structure/activity data presented in this review has yielded a novel insight into the pharmacological characteristics of L-glutamate transport, suggesting existence of additional heterogeneity in the system, beyond that so far discovered by molecular genetics. More compounds that specifically interact with individual glutamate transporters are urgently needed for more detailed investigations of neurochemical characteristics of glutamatergic transport and its integration into the glutamatergic synapses in the central nervous system. A review with 162 references.

Implantable neural interfaces

2018 ◽  
Author(s):  
Stefano Vassanelli
Keyword(s):  
Brain Function ◽  
Large Scale ◽  
Ionic Channels ◽  
Patch Clamp Technique ◽  
Advantages And Disadvantages ◽  
Optogenetic Stimulation ◽  
Physical Interfaces ◽  
The Brain

Establishing direct communication with the brain through physical interfaces is a fundamental strategy to investigate brain function. Starting with the patch-clamp technique in the seventies, neuroscience has moved from detailed characterization of ionic channels to the analysis of single neurons and, more recently, microcircuits in brain neuronal networks. Development of new biohybrid probes with electrodes for recording and stimulating neurons in the living animal is a natural consequence of this trend. The recent introduction of optogenetic stimulation and advanced high-resolution large-scale electrical recording approaches demonstrates this need. Brain implants for real-time neurophysiology are also opening new avenues for neuroprosthetics to restore brain function after injury or in neurological disorders. This chapter provides an overview on existing and emergent neurophysiology technologies with particular focus on those intended to interface neuronal microcircuits in vivo. Chemical, electrical, and optogenetic-based interfaces are presented, with an analysis of advantages and disadvantages of the different technical approaches.

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