scholarly journals Development of Microfluidic Technology for the Extraction of Ions from Some Dye Samples for Pretreatment Prior Analysis

2019 ◽  
Vol 35 (5) ◽  
pp. 1574-1578
Author(s):  
Ahmed Mohamed Fallatah
Keyword(s):  
Physical Properties ◽  
Copper Nanoparticles ◽  
Membrane Surface ◽  
Sample Introduction ◽  
Cu Nanoparticles ◽  
Fast Green ◽  
Microfluidic Technology ◽  
Before And After ◽  
Prior Analysis

Two different dye samples Fast Green and Black T were subjected for extracting their ions using a novel methodology based on microfluidics using a membrane without Treatment and membrane coated with copper nanoparticles, which exploits the advantages of miniaturization for sample introduction and extraction of a range of ions through a membrane before and after treatment. The membrane coated with Cu nanoparticles increases the extracting efficiency to 96.3 and 91.62 for Fastgreen membrane and Black T membrane respectively. This due to the new and good physical properties of the membrane surface after coating with nanoparticles.

scholarly journals Calcium accumulated by sickle cell anemia red cells does not affect their potassium (86Rb+) flux components

Blood ◽  
1986 ◽  
Vol 67 (3) ◽  
pp. 710-715
Author(s):  
OE Ortiz ◽  
VL Lew ◽  
RM Bookchin
Keyword(s):  
Sickle Cell ◽  
Sickle Cell Anemia ◽  
Membrane Surface ◽  
Red Cells ◽  
Cell Fraction ◽  
K Channel ◽  
Ionophore A23187 ◽  
Na Pump ◽  
Before And After ◽  
86Rb Influx

We investigate here the hypothesis that the high Ca content of sickle cell anemia (SS) red cells may produce a sustained activation of the Ca2+-dependent K+ permeability (Gardos effect) and that the particularly high Ca levels in the dense SS cell fraction rich in irreversibly sickled cells (ISCs) might account for the Na pump inhibition observed in these cells. We measured active and passive 86Rb+ influx (as a marker for K+) in density-fractionated SS cells before and after extraction of their excess Ca by exposure to the Ca ionophore (A23187) and ethylene glycol tetra-acetic acid and with or without adenosine triphosphate depletion or addition of quinine. None of these maneuvers revealed any evidence of a Ca2+-dependent K leak in SS discocytes or dense cells. Na pump inhibition in the dense SS cells was associated with normal activation by external K+ and a low Vmax that persisted after Ca extraction from the cells. These results are consistent with our recent findings that the excess Ca in these cells is compartmentalized in intracellular inside-out vesicles and unavailable as free Ca2+ to the inner membrane surface. Although the steady-state free cytoplasmic Ca2+ in oxygenated SS cells must be below the levels needed to activate the K+ channel, possible brief activation of the channels of some SS cells resulting from transient elevations of cell Ca2+ during deoxygenation-induced sickling cannot be excluded. The dense, ISC-rich SS cell fraction showed a Ca2+-independent increase in the ouabain-resistant, nonsaturable component of 86Rb+ influx that, if uncompensated by Na+ gain, could contribute to the dehydration of these cells.

Target regulated photo induced electron transfer of DNA-Cu nanoparticles and their application for the detection of the hepatitis B gene

2018 ◽  
Vol 10 (22) ◽  
pp. 2614-2622 ◽  
Author(s):  
Qiang Xie ◽  
Dongmin Shi ◽  
Jing Wan ◽  
Xiaojun Zhang ◽  
Guangfeng Wang
Keyword(s):  
Electron Transfer ◽  
Hepatitis B ◽  
Copper Nanoparticles ◽  
Fluorescent Probes ◽  
Cu Nanoparticles ◽  
Photo Induced Electron Transfer ◽  
Fluorescence Quencher ◽  
Dna Template ◽  
Distinct Features

Despite the distinct features of polythymine (T)-templated copper nanoparticles (polyT-Cu NPs) as fluorescent probes for various biosensors, most of the reported methods involve labeling with an appropriate fluorescence quencher, or the addition of enzyme to digest the DNA-template.

Identification of yeasts in different rubber leaf (Hevea brasiliensis) clones and their effects on the physical properties of fermented glutinous rice tapai

Food Research ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 29-37
Author(s):  
Z. Mohd Zin ◽  
N.I. Azman ◽  
S.B. Abd Razak ◽  
K. Ibrahim ◽  
N.D. Rusli ◽  
...  
Keyword(s):  
Physical Properties ◽  
Ph Value ◽  
Control Sample ◽  
Candida Guilliermondii ◽  
Solid Content ◽  
Soluble Solids ◽  
Soluble Solid Content ◽  
Rhodotorula Mucilaginosa ◽  
Glutinous Rice ◽  
Before And After

Tapai is one of the most popular traditional desserts in Malaysia and other Asian countries. Traditionally, tapai is wrapped in a rubber leaf to enhance the smell and increase its palatability. The study focused on identifying the yeasts present before and after the production of glutinous rice tapai wrapped in different rubber leaves clones, namely RRIM 2025, RRIM 2002, PB 260 and PB 350. The identification of the yeast was carried out using API 20C AUX test strips for all rubber leaves clones, glutinous rice tapai wrapped in RRIM 2025, RRIM 2002, PB 260, PB 350 and in a container (control). The results showed that Crytococcus laurentii, Rhodotorula mucilaginosa 2, Candida famata, Rhodotorula minuta were present in rubber leaf clones. While the yeasts that had been identified in tapai wrapped in rubber leaf were Candida guilliermondii, Rhodotorula mucilaginosa 2, Candida parapsilosis and Trichosporon mucoides and only C. guilliermondii was found in the container. The physical properties of the tapai that are wrapped in rubber leaves have a difference in texture, pH value and total soluble solids content compared to the control sample. The tapai sample wrapped in RRIM 2025 and RRIM 2002 had a high total soluble solid content of 45.8±0.14% and 45.78±0.16% °Bx, respectively. Meanwhile, the control sample has the highest pH value and the hardest rice kernels, which were 4.71±0.05 and 218.19±25.39 N, respectively. The results showed that the different yeasts present in the rubber leaf may cause changes in the physical properties of glutinous rice tapai.

scholarly journals Heterogeneity of proteoglycans extracted before and after collagenase treatment of human articular cartilage: I. Physical properties related to age

1986 ◽  
Vol 29 (10) ◽  
pp. 1239-1247 ◽  
Author(s):  
Rob J. Van De Stadt ◽  
Roel Kuijer ◽  
G. P. Jos Van Kampen ◽  
Margret H. M. T. De Koning ◽  
Els Van De Voorde-Vissers ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Physical Properties ◽  
Human Articular Cartilage ◽  
Collagenase Treatment ◽  
Before And After

scholarly journals An N-heterocyclic carbene ligand promotes highly selective alkyne semihydrogenation with copper nanoparticles supported on passivated silica

2018 ◽  
Vol 9 (24) ◽  
pp. 5366-5371 ◽  
Author(s):  
Nicolas Kaeffer ◽  
Hsueh-Ju Liu ◽  
Hung-Kun Lo ◽  
Alexey Fedorov ◽  
Christophe Copéret
Keyword(s):  
Copper Nanoparticles ◽  
High Selectivity ◽  
Cu Nanoparticles

Binding of an N-heterocyclic carbene to Cu nanoparticles on passivated silica enables high selectivity in alkyne semihydrogenation.

scholarly journals CO2 electroreduction to fuels on mesoporous carbon-embedded copper nanoparticles

2020 ◽  
Vol 4 (12) ◽  
pp. 6045-6053
Author(s):  
Nihat Sahin ◽  
Wanderson O. Silva ◽  
Mariana R. Camilo ◽  
Edson A. Ticianelli ◽  
Fabio H. B. Lima ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Mesoporous Carbon ◽  
Soft Template ◽  
Cu Nanoparticles ◽  
Green Process ◽  
Charge Mass ◽  
Co2 Electroreduction ◽  
Mass Transfers

An electrocatalyst with Cu nanoparticles embedded in a mesoporous carbon was prepared by the soft-template route using a green process. Its particular structure boosts its performance for CO2RR regarding selectivity and charge/mass transfers.

Base-free hydrogen generation from formaldehyde and water catalyzed by copper nanoparticles embedded on carbon sheets

2019 ◽  
Vol 9 (3) ◽  
pp. 783-788 ◽  
Author(s):  
Xiao Chen ◽  
Huan Zhang ◽  
Zhaoming Xia ◽  
Sai Zhang ◽  
Yuanyuan Ma
Keyword(s):  
Copper Nanoparticles ◽  
Hydrogen Generation ◽  
Cu Nanoparticles ◽  
Free Hydrogen

Base-free hydrogen generation through complete dehydrogenation from formaldehyde and water catalyzed by Cu nanoparticles embedded on carbon sheets.

Enzymatic polymerization of poly(thymine) for the synthesis of copper nanoparticles with tunable size and their application in enzyme sensing

2015 ◽  
Vol 51 (41) ◽  
pp. 8644-8647 ◽  
Author(s):  
Tai Ye ◽  
Chunying Li ◽  
Chen Su ◽  
Xinghu Ji ◽  
Jiao Zheng ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Enzymatic Polymerization ◽  
Cu Nanoparticles ◽  
Bottom Up ◽  
Sensing Performance

A bottom-up strategy was developed for enzyme mediated synthesis of Cu nanoparticles, which showed good sensing performance.

Mixed Polymers and Vulcanizable Plasticizers. Relation to the Vulcanization of Rubber

1941 ◽  
Vol 14 (4) ◽  
pp. 826-834
Author(s):  
B. S. Garvey ◽  
C. H. Alexander ◽  
F. E. Küng ◽  
D. E. Henderson
Keyword(s):  
Physical Properties ◽  
Vital Role ◽  
Mixed Composition ◽  
Manufacturing Operations ◽  
Vulcanized Rubber ◽  
Hydrocarbon Solvents ◽  
Original Shape ◽  
Before And After ◽  
The Difference

Abstract The vital role played by rubber in modern civilization is due in part to the physical properties displayed by soft vulcanized rubber in service and in part to the characteristics of unvulcanized milled rubber which make it amenable to manufacturing operations. Vulcanization of rubber is a change in condition usually induced by heating it with sulfur, and is best defined by contrasting the difference in physical properties: To illustrate, compare a mill-mixed composition before and after vulcanization. Before vulcanization it is easily pulled apart and, if considerably extended, shows little tendency to retract, although, under impact, the recovery or rebound is considerable. If heated it becomes even softer and more plastic, and can easily be formed into any desired shape. If cooled to 0° C or somewhat lower, it becomes stiff and boardy. It is readily soluble in hydrocarbon solvents. When two fresh surfaces are pressed together, they coalesce and become practically integral. This tack, as it is called, is valuable in manufacturing operations. After vulcanization, rubber is tough and strong and, after even a slow distortion, returns rapidly to its original shape. It has little tendency to flow and is devoid of tack. It swells but does not dissolve in hydrocarbon solvents. These characteristics change very little from −40° to well above 100° C.

Graphene oxide doped poly(3,4-ethylenedioxythiophene) modified with copper nanoparticles for high performance nonenzymatic sensing of glucose

2015 ◽  
Vol 3 (4) ◽  
pp. 556-561 ◽  
Author(s):  
Ni Hui ◽  
Wenting Wang ◽  
Guiyun Xu ◽  
Xiliang Luo
Keyword(s):  
Graphene Oxide ◽  
Conducting Polymer ◽  
Electrochemical Deposition ◽  
Copper Nanoparticles ◽  
High Performance ◽  
Glucose Sensor ◽  
Cu Nanoparticles ◽  
Nonenzymatic Glucose Sensor ◽  
Nonenzymatic Sensing ◽  
Highly Sensitive

A highly sensitive and stable nonenzymatic glucose sensor was developed through the electrochemical deposition of Cu nanoparticles onto an electrodeposited nanocomposite of conducting polymer PEDOT doped with graphene oxide.

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