173,447 research outputs found
Solid-State NMR Determination of Protein Secondary Structure
No full textThis work focused on developing solid-state NMR pulse sequence to determine the protein secondary structure. Chapter 1 gives a basic view of using solid-state NMR to obtain the structure information. The main thesis was discussed in four parts: Ch.2: R-TOBSY: isotropic polarization transfer in biological solids. Ch.3: MCSP: Multiple Chemical Shift Precession for selective polarization transfer. Ch.4: psi angle determination: using correlation between C' CSA and Ca−Ha tensors.
Ch.5: CONGEE: Correlation Of Non-Gamma Encoded Experiment.
Each part is self-contained. The successful experiments of R-TOBSY (Chapter 2) and MCSP (Chapter3) in biological solids provide a crucial step for the psi angle determination in Chapter 4 and Chapter 5. Chapter 4~5 discussed the spin physics of the RACO experiment originally introduced by Ishii and co-workers in 1996. Through the analytical analysis, the optimal RACO experiment was designed and was employed for determination of the dihedral angles of L-alanine and DL-NAV. Brief conclusion and outlook were summarized in chapter 6.Chapter 1 Structure Determination by Solid-State NMR 1
1.1 Solid-State NMR versus Solution-State NMR 1
1.2 Pulse Sequence in Static Solid-State NMR 2
1.3 Magic Angle Spinning (MAS) 3
1.4 Pulse Sequence under MAS 4
1.5 Structure Information Determined by SSNMR 4
1.5.1 Chemical-shift based conformation determination 4
1.5.2 Distance constraints 5
1.5.3 Angular constraints 5
1.6 Summary 9
Chapter 2 R-TOBSY without proton decoupling 13
2.1 Introduction 13
2.2 Brief Review of TOBSY-Like Sequences 14
2.3 Simulations on No Decoupling R-TOBSY 16
2.4 Experimental 19
2.4.1 Sample preparation 19
2.4.2 Solid-state NMR 19
2.5 Results and Discussion 20
2.6 Conclusion 24
Chapter 3 Selective Polarization Transfer Based on
Multiple Chemical Shift Precession 28
3.1 Introduction 28
3.2 Theory 29
3.2.1 Two-spin system 29
3.2.2 Three-spin system 32
3.3 Experimental 32
3.4 Results and Discussion 34
Chapter 4 Psi Angle Determination by RACO 42
4.1 Introduction 42
4.2 Theory 43
4.2.1 Correlation analysis 44
4.2.2 Numerical simulations 46
4.2.3 General consideration 47
4.2.4 Sensitivity to Psi angle 52
4.2.5 Experimental consideration 53
4.3 Experimental 54
4.3.1 Sample preparation 54
4.3.2 NMR experiments 54
4.3.3 Numerical simulations 55
4.3.4 Data process 56
4.4 Results 56
4.4.1 1D spectra 56
4.4.2 2D spectra 56
Chapter 5 Correlations of Non-Gamma Encoded Experiments 62
5.1 Introduction 62
5.2 Correlation Analysis 63
5.3 Rotor-phase Encoded Experiments 68
5.4 Magnetization-Phase Encoded Experiments 76
5.5 Discussion of Rotor-Phase Encoded and Magnetization
Encoded Experiments 79
5.6 Supercycle-Phase Encoded Experiments 82
Chapter 6 Conclusions and Outlook 8
Preparation and Characterization of Vanadium Oxide Species Supported on Mesoporous Silica for the Hydroxylation of Benzene
No full textLispe subbivittata Mou 1992
No full textLispe subbivittata Mou, 1992 Lispe bivittata Stein, 1909: 262 auctt. Lispe subbivittata Mou, 1992: 378. Distribution. This species was previously recorded as L. bivittata from Saudi Arabia by Pont (1991); Abu-Zoherah et al. (1993). It was described from China. In the Middle East it is recorded from Egypt, Iran, and Yemen (Vikhrev 2014). Taxonomic remarks. Mou (1992: 378) described the subspecies L. bivittata subbivittata based on the female sex only, separated from the nominate subspecies by the absence of a submedian anteroventral on the hind femur. Vikhrev (2012a) elevated L. bivittata subbivittata to species level and presented a key to distinguish both sexes.Published as part of Dawah, Hassan A., Abdullah, Mohammed A. & Deeming, John C., 2020, The Muscidae (Diptera) of Saudi Arabia, descriptions of two new species, new records and updated list of species, pp. 1-54 in Zootaxa 4869 (1) on page 40, DOI: 10.11646/zootaxa.4869.1.1, http://zenodo.org/record/441824
Intrinsic frames of reference and egocentric viewpoints in scene recognition
No full textThree experiments investigated the roles of intrinsic directions of a scene and observer's viewing direction in recognizing the scene. Participants learned the locations of seven objects along an intrinsic direction that was different from their viewing direction and then recognized spatial arrangements of three or six of these objects from different viewpoints. The results showed that triplets with two objects along the intrinsic direction (intrinsic triplets) were easier to recognize than triplets with two objects along the study viewing direction (non-intrinsic triplets), even when the intrinsic triplets were presented at a novel test viewpoint and the non-intrinsic triplets were presented at the familiar test viewpoint. The results also showed that configurations with the same three or six objects were easier to recognize at the familiar test viewpoint than other viewpoints. These results support and develop the model of spatial memory and navigation proposed by Mou, McNamara, Valiquette, and Rump [Mou, W., McNamara, T. P., Valiquiette C. M., & Rump, B. (2004). Allocentric and egocentric updating of spatial memories. Journal of Experimental Psychology: Learning, Memory, and Cognition, 30, 142-157].Three experiments investigated the roles of intrinsic directions of a scene and observer's viewing direction in recognizing the scene. Participants learned the locations of seven objects along an intrinsic direction that was different from their viewing direction and then recognized spatial arrangements of three or six of these objects from different viewpoints. The results showed that triplets with two objects along the intrinsic direction (intrinsic triplets) were easier to recognize than triplets with two objects along the study viewing direction (non-intrinsic triplets), even when the intrinsic triplets were presented at a novel test viewpoint and the non-intrinsic triplets were presented at the familiar test viewpoint. The results also showed that configurations with the same three or six objects were easier to recognize at the familiar test viewpoint than other viewpoints. These results support and develop the model of spatial memory and navigation proposed by Mou, McNamara, Valiquette, and Rump [Mou, W., McNamara, T. P., Valiquiette C. M., & Rump, B. (2004). Allocentric and egocentric updating of spatial memories. Journal of Experimental Psychology: Learning, Memory, and Cognition, 30, 142-157]. (C) 2007 Elsevier B.V. All rights reserved
COAUTHOR - a MoU to create a COnsortium of Academics from Universities promoting the use of THORium
No full textThis paper describes the Memorandum of Understanding (MoU) signed by the authors to create a future consortium of academics from universities to promote the utilization of thorium (COAUTHOR). Besides the description of the MoU, also results of the research conducted in each participating partner or collaborative work performed among them will be described. Finally, the future work planned in the framework of the MoU, will be discussed
Nanostructure and Chemistry in Confined Spaces (3/3)
No full textProject Serial No.: NSC 92-2113-M-002-005
Project Term: 8/1/2003--7/31/2004 (third year)
Principal Investigators:
Chung-Yuan Mou, Dept. of Chemistry & CCMR, National Taiwan University, Taiwan
Shang-Bin Liu, IAMS, Academia Sinica, Taiwan
John S. Tse, SIMS, National Research Council, Canada
John A. Ripmeester, SIMS, National Research Council, Canada
Yu Wang, Dept. of Chemistry, National Taiwan University, Taiwan
Abstract
The objective of this three-year research
proposal is to adopt a multi-disciplinary
approach combining theoretical and
experimental probes to study chemistry in
confined spaces, especially in the nanometer
scale. Recent developments in the synthesis
of mesoporous aluminosilicates provide a
unique opportunity to exploit nanopores as
chemical vessels. The uniform mesoporous
materials, such as M41S, SBA etc. with a
controllable narrow pore size distribution are
ideal media for the study of structure and
properties on the nanoscale. The
amalgamation of complementary research
expertise from the Canadian and Taiwan
scientists is a key element for the success of
the proposed research. Three independent but
closely related projects are proposed:
(A) Phase Transformations in Nano-channels:
Ga Confined in MCM-41.
(B) Structure and Luminescence of Quantum
Confined Semiconductors: Surface
Structure and Its Defects.
(C) Implementation, Development and
Application of Hyperpolarized Xenon on
the Physical-Chemical Properties of
Porous Materials.
(D) Study dynamics of supercooled confined
water by Neutron scattering.(QENS)
The outcome of this research should be beneficial to the fabrication, formation
mechanism and future applications of the
novel nano-scaled electrical-optical devices.
Furthermore, the development and
fabrication of HP-129 Xe should not only
useful for characterizing properties of surface
modified/functionalized porous materials but
also facilitates future syntheses and
applications of novel nanostructured
materials with engineered properties
[[alternative]]“Moral feeling” in the Philosophical Systems of Mou Tsung-san and Immanuel Kant
No full text[[abstract]]The main purpose of this study is to compare the concept of “moral feeling” in the philosophical systems of Mou Tsung-san and Immanuel Kant. Firstly, we try to probe into the development of “moral feeling” in Kant’s moral philosophy, and analyze the probable origins of it and its relevant concepts, including Pietism, Leibniz-Wolffian philosophy, “Moral Sense Theory” of F. Hutcheson, C. A. Crusius’ concept of “obligation”, and J. J. Rousseau’s thought of human right. Secondly, we discuss Mou’s understanding of “moral feeling”. In Mou’s point, “moral feeling” is a kind of “Ontological feeling”. Thirdly, the fundamental difference, i.e., whether the capability of “intellectual intuition” of human being is recognized or not, between Mou and Kant is investigated. In addition, it is pointed out that their difference could be due to two cultural types, namely Continuity of being and Dis-continuity of being. Finally, based on all our discussion, we discern the meaning of “moral” and “ethic” in the Chinese and Western traditional culture, and think about the possible development of Chinese moral philosophy. The implication of moral philosophy of Mou and Kant for moral education is also expounded.
Fig. 14. Bergera unifolia C.L.Deng & F.J.Mou. A. Inflorescence. B. Fruit. C–D in Taxonomic revision of Bergera J.Koenig ex L. (Rutaceae) based on the molecular phylogeny and morphology
No full textFig. 14. Bergera unifolia C.L.Deng & F.J.Mou. A. Inflorescence. B. Fruit. C–D. Dorsal side of leaf. E. Flower. F. Flower parts. Photos taken by Feng-Juan Mou in China.Published as part of Mou, Feng-Juan & Cuong, Nguyen Manh, 2023, Taxonomic revision of Bergera J.Koenig ex L. (Rutaceae) based on the molecular phylogeny and morphology, pp. 141-180 in European Journal of Taxonomy 860 on page 174, DOI: 10.5852/ejt.2023.860.2057, http://zenodo.org/record/768937
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
