An application of the polarizing microscope to reaction study

1942 ◽  
Vol 19 (7) ◽  
pp. 331 ◽  
Author(s):  
Garrett W. Thiessen ◽  
Lawrence F. Beste
Keyword(s):  
Reaction Study ◽  
Polarizing Microscope

The spindle stage: A powerful optical tool

1988 ◽  
Vol 46 ◽  
pp. 52-53
Author(s):  
Mickey E. Gunter ◽  
F. Donald Bloss
Keyword(s):  
Significant Error ◽  
Optical Data ◽  
Refractive Indices ◽  
Axis Of Rotation ◽  
Polarizing Microscope ◽  
Microscope Stage

A single, reasonably homogeneous, nonopaque 30-to-300 μm crystal, mounted on a spindle stage and studied by immersion methods under a polarizing microscope, yields optical data frequently sufficient to identify and characterize a substance unequivocally. The data obtainable include (1) the orientation of the crystal's principal vibration axes and (2) its principal refractive indices, to within 0.0002 if desired, for light vibrating along these principal vibration axes. Spindle stages tend to be simple and relatively inexpensive, some costing less than $50. They permit rotation of the crystal about a single axis which is parallel to the microscope stage. This spindle or S-axis is thus perpendicular to the M-axis, namely the microscope stage's axis of rotation.A spindle stage excels when studying anisotropic crystals. It orients uniaxial crystals within minutes and biaxial crystals almost as quickly so that their principal refractive indices - ɛ and ω (uniaxial); α, β and γ (biaxial) - can be determined without significant error from crystal misorientation.

scholarly journals Fasting Blood Glucose and 2-h Postprandial Blood Glucose Predict Hypertension: A Report from the REACTION Study

2021 ◽  
Vol 12 (4) ◽  
pp. 1117-1128
Author(s):  
Yingkui Si ◽  
Anping Wang ◽  
Yunshuang Yang ◽  
Hongzhou Liu ◽  
Shi Gu ◽  
...  
Keyword(s):  
Blood Glucose ◽  
Fasting Blood Glucose ◽  
Postprandial Blood Glucose ◽  
Reaction Study

scholarly journals A Rapid Reaction Study of Anthranilate Hydroxylase

1989 ◽  
Vol 264 (27) ◽  
pp. 16008-16016 ◽  
Author(s):  
J Powlowski ◽  
D Ballou ◽  
V Massey
Keyword(s):  
Reaction Study ◽  
Rapid Reaction

scholarly journals Feulgen reaction study of novel threadlike structures (Bonghan ducts) on the surfaces of mammalian organs

2005 ◽  
Vol 284B (1) ◽  
pp. 35-40 ◽  
Author(s):  
Hak-Soo Shin ◽  
Hyeon-Min Johng ◽  
Byung-Cheon Lee ◽  
Sung-Il Cho ◽  
Kyung-Soon Soh ◽  
...  
Keyword(s):  
Feulgen Reaction ◽  
Reaction Study

Oocyte Maturation in Chaetopterus pergamentaceous Observed With Centrifuge Polarizing Microscope

1998 ◽  
Vol 195 (2) ◽  
pp. 212-214 ◽  
Author(s):  
M. Goda ◽  
S. Inoué ◽  
R. A. Knudson
Keyword(s):  
Oocyte Maturation ◽  
Polarizing Microscope

Effect on Polymer Chain Structure Caused by the Molar Fraction of 4-Hydroxybutyrate in Poly(3-hydroxybutyrate- co -4-hydroxybutyrate)

2012 ◽  
Vol 602-604 ◽  
pp. 776-780
Author(s):  
Zhi Qiang Li ◽  
Mei Li ◽  
Wei Jia Fan
Keyword(s):  
Molecular Weight ◽  
Intrinsic Viscosity ◽  
Polymer Chain ◽  
Molar Fraction ◽  
Chain Structure ◽  
The Other ◽  
Mean Square ◽  
Polarizing Microscope ◽  
Other Hand ◽  
The Mean

Poly(3-hydroxybutyrate-co-4-hydroxybutyrate)copolymer [P(3HB-co-4HB)] is a kind of biodegradable high molecular polymer produced by bioaccumulation. Because of the good biodegradability and biocompatibility, P(3HB-co-4HB)s have attracted wide attention . At first, the intrinsic viscosity[η] in good solvent of P(3HB-co-4HB) s with varying contents of 4HB was investigated in different temperature. Second, observed the changes of crystallization gathered state caused by the varying contents of 4HB by polarizing microscope. The results show that to the P(3HB-co-4HB)s in same molecular weight, the intrinsic viscosity[η] in good solvent barely changes when the mole fractions of 4HB increase. On the other hand, the mean square end to end distances[0] of macromolecular flexible chains increase with the mole fractions of 4HB. At the same time, the states of aggregation change from spherulites to dendrites. In this investigation, we discuss the reasons of the differences in depth.

Solubility in the potassium stannate – potassium hydroxide – water system at 0 to 95.0 °C

1968 ◽  
Vol 46 (16) ◽  
pp. 2715-2719 ◽  
Author(s):  
P. Rosenblum
Keyword(s):  
Potassium Hydroxide ◽  
Invariant Point ◽  
Water System ◽  
Phase Relations ◽  
Polarizing Microscope ◽  
Solid Phases ◽  
Hydroxide Water

Solubilities and phase relations have been determined in the K2Sn(OH)6–KOH–H2O system between 0 and 95.0 °C. The isotherms consist of only one major solubility branch, that of K2Sn(OH)6, while the solubility branch of KOH is indistinguishable, since the isothermal invariant point is extremely close to the solubility of potassium hydroxide. Solid phases have been determined by Schreinemakers' method and checked with the polarizing microscope.

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