Temperature dependence of photoluminescence from InNAsSb layers: The role of localized and free carrier emission in determination of temperature dependence of energy gap

2013 ◽  
Vol 102 (12) ◽  
pp. 122109 ◽  
Author(s):  
M. Latkowska ◽  
R. Kudrawiec ◽  
F. Janiak ◽  
M. Motyka ◽  
J. Misiewicz ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Energy Gap ◽  
Free Carrier

Temperature dependence of the energy gap in superconducting Al–Al2O3–Al tunnel junctions

1968 ◽  
Vol 46 (2) ◽  
pp. 141-145 ◽  
Author(s):  
B. L. Blackford ◽  
R. H. March
Keyword(s):  
Temperature Dependence ◽  
Energy Gap ◽  
Tunnel Junctions ◽  
Small Deviation ◽  
Mean Value ◽  
Bcs Theory ◽  
Energy Gaps ◽  
The Mean ◽  
Gap Values

The most detailed measurements of the energy gap in Al by the tunneling technique have been made using Al–Al2O3-Pb junctions. Determination of the energy gaps from the I–V curves of these junctions is more precise than previous results using Al–Al2O3–Al tunnel junctions. The chief difficulty with the Al–Al2O3–Al junctions has been the lack of definition in the I–V curves, especially near Tc. Al–Al2O3–Al junctions, in which the energy-gap voltages can be read from the I-V curve with very little ambiguity up to T/Tc ≈ 0.99, are reported here. For the majority of the junctions studied, the temperature dependence of the normalized gap Δ(t)/Δ(0) shows very little scatter (T = 0.34 °K to T = Tc) and agrees closely with the BCS theory. However, a consistent small deviation is observed, with the measured gap values being slightly higher than the BCS prediction. The mean value of 2Δ(0)/kBTc obtained from 21 different junctions is 3.53 with an r.m.s. deviation of ± 0.02.

The role of the Ca vacancy in the determination of the europium position in the energy gap, its valence state and spectroscopic properties in KCa(PO3)3

2014 ◽  
Vol 16 (12) ◽  
pp. 5581 ◽  
Author(s):  
A. Watras ◽  
A. Matraszek ◽  
P. Godlewska ◽  
I. Szczygieł ◽  
J. Wojtkiewicz ◽  
...  
Keyword(s):  
Valence State ◽  
Energy Gap ◽  
Spectroscopic Properties

Temperature dependence of the energy gap and free carrier absorption in bulk InAs0.05Sb0.95 single crystals

2003 ◽  
Vol 82 (26) ◽  
pp. 4720-4722 ◽  
Author(s):  
Bhavtosh Bansal ◽  
V. K. Dixit ◽  
V. Venkataraman ◽  
H. L. Bhat
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Energy Gap ◽  
Free Carrier ◽  
Free Carrier Absorption ◽  
Carrier Absorption

Determination of the concentration and temperature dependence of the fundamental energy gap in AlxIn1−xSb

1998 ◽  
Vol 73 (21) ◽  
pp. 3132-3134 ◽  
Author(s):  
N. Dai ◽  
F. Brown ◽  
R. E. Doezema ◽  
S. J. Chung ◽  
K. J. Goldammer ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Energy Gap

A Molecular Approach to Immunoscintigraphy: A Study of the T-Antigen Conformation on the Surface of Tumors

1987 ◽  
Vol 26 (01) ◽  
pp. 1-6 ◽  
Author(s):  
S. Selvaraj ◽  
M. R. Suresh ◽  
G. McLean ◽  
D. Willans ◽  
C. Turner ◽  
...  
Keyword(s):  
Monoclonal Antibodies ◽  
Tumor Cell ◽  
T Antigen ◽  
Human Carcinomas ◽  
Animal Tumor ◽  
Synthetic Antigens

The role of glycoconjugates in tumor cell differentiation has been well documented. We have examined the expression of the two anomers of the Thomsen-Friedenreich antigen on the surface of human, canine and murine tumor cell membranes both in vitro and in vivo. This has been accomplished through the synthesis of the disaccharide terminal residues in both a and ß configuration. Both entities were used to generate murine monoclonal antibodies which recognized the carbohydrate determinants. The determination of fine specificities of these antibodies was effected by means of cellular uptake, immunohistopathology and immunoscintigraphy. Examination of pathological specimens of human and canine tumor tissue indicated that the expressed antigen was in the β configuration. More than 89% of all human carcinomas tested expressed the antigen in the above anomeric form. The combination of synthetic antigens and monoclonal antibodies raised specifically against them provide us with invaluable tools for the study of tumor marker expression in humans and their respective animal tumor models.

On The Mechanism Of Heparin-Induced Potentiation Of Platelet Aggregation

1981 ◽  
Author(s):  
M Yamamoto ◽  
K Watanabe ◽  
Y Ando ◽  
H Iri ◽  
N Fujiyama ◽  
...  
Keyword(s):  
Platelet Aggregation ◽  
Platelet Activation ◽  
Coagulation Factors ◽  
Marked Enhancement ◽  
Matrix Bound ◽  
Induced Aggregation ◽  
Aggregation Of Platelets ◽  
Plasma Heparin

It has been suggested that heparin caused potentiation of aggregation induced by ADP or epinephrine. The exact mechanism of heparin-induced platelet activation, however, remained unknown. In this paper, we have investigated the role of anti-thrombin III ( AT ) in heparin-induced platelet activation using purified AT and AT depleted plasma. When ADP or epinephrine was added to citrated PRP one minute after addition of heparin ( 1 u/ml, porcine intestinal mucosal heparin, Sigma Co. USA ), marked enhancement of platelet aggregation was observed, compared with the degree of aggregation in the absence of heparin. However, in platelet suspensions prepared in modified Tyrode’s solution, heparin exhibited no potentiating effect on platelet aggregation induced by epinephrine or ADP. Potentiation of epinephrine- or ADP-induced platelet aggregation by heparin was demonstrated when purified AT was added to platelet suspensions at a concentration of 20 μg/ml. AT depleted plasma, which was prepared by immunosorption using matrix-bound antibodies to AT, retained no AT, while determination of α1-antitrypsinα2- macroglobulin and fibrinogen in AT depleted plasma produced values which corresponded to those of the original plasma when dilution factor was taken into account. The activities of coagulation factors were also comparable to those of the original plasma. Heparin exhibited potentiating effect on ADP- or epinephrine-induced aggregation of platelets in original plasma, but no effect in AT depleted plasma. When purified AT was added back to AT depleted plasma at a concentration of 20 μg/ml, potentiation of platelet aggregation by heparin was clearly demonstrated.Our results suggest that effect of heparin on platelet aggregation is also mediated by anti-thrombin III.

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