ChemInform Abstract: Studies Toward the Thermally Induced One-Step Intermolecular Synthesis of Azacyclic Steroidal Ketones.

ChemInform ◽  
2009 ◽  
Vol 40 (44) ◽  
Author(s):  
Shamsuzzaman Shamsuzzaman ◽  
M. Gulfam Alam ◽  
Tabassum Siddiqui
Keyword(s):  
Thermally Induced ◽  
One Step

scholarly journals Synthesis, Properties, and Derivatization of Poly(dihydrogermane): A Germanium-based Polyethylene Analogue

2020 ◽  
Author(s):  
Haoyang Yu ◽  
Chuyi Ni ◽  
Alyxandra Thiessen ◽  
Ziqi Li ◽  
Jonathan G.C. Veinot
Keyword(s):  
Electronic Properties ◽  
Pendant Group ◽  
Zintl Phase ◽  
Present Contribution ◽  
Thermally Induced ◽  
Synthesis Properties ◽  
One Step ◽  
Derivatization Reaction

<div> <div> <div> <p>Polygermanes are germanium-based analogues of polyolefins and possess polymer backbones made up catenated Ge atoms. In the present contribution we report the preparation of a stable germanium polyethylene analogue – polydihydrogermane (i.e., (GeH2)n) – via two straightforward approaches that involve topotactic deintercalation of the CaGe Zintl phase. The resulting (GeH2)n possess morphologically dependent chemical and electronic properties and thermally decompose to yield amorphous hydrogenated Ge. We also show that the resulting (GeH2)n provide a platform from which functionalized polygermanes can be prepared via thermally-induced hydrogermylation-mediated pendant group substitution. This facile one-step derivatization reaction exploits Ge–H reactivity and opens the door to a wide array of tailored functional polygermanes. </p> </div> </div> </div>

Preparation of affinity membranes using thermally induced phase separation for one-step purification of recombinant proteins

2013 ◽  
Vol 434 (2) ◽  
pp. 269-274 ◽  
Author(s):  
Takafumi Honjo ◽  
Kazuki Hoe ◽  
Shunsuke Tabayashi ◽  
Tsutomu Tanaka ◽  
Josui Shimada ◽  
...  
Keyword(s):  
Phase Separation ◽  
Recombinant Proteins ◽  
Thermally Induced Phase Separation ◽  
Thermally Induced ◽  
Affinity Membranes ◽  
One Step

scholarly journals Synthesis, Properties, and Derivatization of Poly(dihydrogermane): A Germanium-based Polyethylene Analogue

2020 ◽  
Author(s):  
Haoyang Yu ◽  
Chuyi Ni ◽  
Alyxandra Thiessen ◽  
Ziqi Li ◽  
Jonathan G.C. Veinot
Keyword(s):  
Electronic Properties ◽  
Pendant Group ◽  
Zintl Phase ◽  
Present Contribution ◽  
Thermally Induced ◽  
Synthesis Properties ◽  
One Step ◽  
Derivatization Reaction

<div> <div> <div> <p>Polygermanes are germanium-based analogues of polyolefins and possess polymer backbones made up catenated Ge atoms. In the present contribution we report the preparation of a stable germanium polyethylene analogue – polydihydrogermane (i.e., (GeH2)n) – via two straightforward approaches that involve topotactic deintercalation of the CaGe Zintl phase. The resulting (GeH2)n possess morphologically dependent chemical and electronic properties and thermally decompose to yield amorphous hydrogenated Ge. We also show that the resulting (GeH2)n provide a platform from which functionalized polygermanes can be prepared via thermally-induced hydrogermylation-mediated pendant group substitution. This facile one-step derivatization reaction exploits Ge–H reactivity and opens the door to a wide array of tailored functional polygermanes. </p> </div> </div> </div>

Thermally-induced one-step construction of the tetracyclic steroidal skeleton from acyclic enyne-allenes

1993 ◽  
Vol 58 (7) ◽  
pp. 1651-1652 ◽  
Author(s):  
Yemane W. Andemichael ◽  
Ying Huang ◽  
Kung K. Wang
Keyword(s):  
Thermally Induced ◽  
One Step

scholarly journals Synthesis, Properties, and Derivatization of Poly(dihydrogermane): A Gemanium-based Polyethylene Analogue

2020 ◽  
Author(s):  
Haoyang Yu ◽  
Chuyi Ni ◽  
Alyxandra Thiessen ◽  
Ziqi Li ◽  
Jonathan G.C. Veinot
Keyword(s):  
Electronic Properties ◽  
Pendant Group ◽  
Zintl Phase ◽  
Present Contribution ◽  
Thermally Induced ◽  
Synthesis Properties ◽  
One Step ◽  
Derivatization Reaction

<div> <div> <div> <p>Polygermanes are germanium-based analogues of polyolefins and possess polymer backbones made up catenated Ge atoms. In the present contribution we report the preparation of a stable germanium polyethylene analogue – polydihydrogermane (i.e., (GeH2)n) – via two straightforward approaches that involve topotactic deintercalation of the CaGe Zintl phase. The resulting (GeH2)n possess morphologically dependent chemical and electronic properties and thermally decompose to yield amorphous hydrogenated Ge. We also show that the resulting (GeH2)n provide a platform from which functionalized polygermanes can be prepared via thermally-induced hydrogermylation-mediated pendant group substitution. This facile one-step derivatization reaction exploits Ge–H reactivity and opens the door to a wide array of tailored functional polygermanes. </p> </div> </div> </div>

An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

1976 ◽  
Vol 34 ◽  
pp. 542-543
Author(s):  
R.P. Goehner ◽  
W.T. Hatfield ◽  
Prakash Rao
Keyword(s):  
Electron Diffraction ◽  
Real Time ◽  
Pattern Analysis ◽  
Flow Diagram ◽  
Hard Copy ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

Morphologies of Nonadherent Al2O3 and Matching Substrate Surfaces

1972 ◽  
Vol 30 ◽  
pp. 524-525
Author(s):  
C. S. Giggins ◽  
J. K. Tien ◽  
B. H. Kear ◽  
F. S. Pettit
Keyword(s):  
Electron Microscopy ◽  
Oxide Scale ◽  
Oxidation Resistance ◽  
Substrate Surface ◽  
Morphological Features ◽  
Thermally Induced ◽  
Oxide Spallation ◽  
Oxidation Resistant ◽  
Induced Stresses ◽  
Substrate Surfaces

The performance of most oxidation resistant alloys and coatings is markedly improved if the oxide scale strongly adheres to the substrate surface. Consequently, in order to develop alloys and coatings with improved oxidation resistance, it has become necessary to determine the conditions that lead to spallation of oxides from the surfaces of alloys. In what follows, the morphological features of nonadherent Al2O3, and the substrate surfaces from which the Al2O3 has spalled, are presented and related to oxide spallation.The Al2O3, scales were developed by oxidizing Fe-25Cr-4Al (w/o) and Ni-rich Ni3 (Al,Ta) alloys in air at 1200°C. These scales spalled from their substrates upon cooling as a result of thermally induced stresses. The scales and the alloy substrate surfaces were then examined by scanning and replication electron microscopy.The Al2O3, scales from the Fe-Cr-Al contained filamentary protrusions at the oxide-gas interface, Fig. 1(a). In addition, nodules of oxide have been developed such that cavities were formed between the oxide and the substrate, Fig. 1(a).

Applications of ultramicrotomy for materials characterization

1993 ◽  
Vol 51 ◽  
pp. 232-233
Author(s):  
R.T. Blackham ◽  
J.J. Haugh ◽  
C.W. Hughes ◽  
M.G. Burke
Keyword(s):  
Materials Science ◽  
Microstructural Analysis ◽  
Analytical Electron Microscopy ◽  
Austenitic Stainless Steels ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Thermally Induced ◽  
Radiation Induced ◽  
Characterization Of Materials

Essential to the characterization of materials using analytical electron microscopy (AEM) techniques is the specimen itself. Without suitable samples, detailed microstructural analysis is not possible. Ultramicrotomy, or diamond knife sectioning, is a well-known mechanical specimen preparation technique which has been gaining attention in the materials science area. Malis and co-workers and Glanvill have demonstrated the usefulness and applicability of this technique to the study of a wide variety of materials including Al alloys, composites, and semiconductors. Ultramicrotomed specimens have uniform thickness with relatively large electron-transparent areas which are suitable for AEM anaysis.Interface Analysis in Type 316 Austenitic Stainless Steel: STEM-EDS microanalysis of grain boundaries in austenitic stainless steels provides important information concerning the development of Cr-depleted zones which accompany M23C6 precipitation, and documentation of radiation induced segregation (RIS). Conventional methods of TEM sample preparation are suitable for the evaluation of thermally induced segregation, but neutron irradiated samples present a variety of problems in both the preparation and in the AEM analysis, in addition to the handling hazard.

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