196,193 research outputs found
FIGURE 2. A–P, Murdannia satheeshiana. A in Murdannia satheeshiana-a new species of Commelinaceae from the Western Ghats, India
No full textFIGURE 2. A–P, Murdannia satheeshiana. A. habit; B. habitat; C. & D. flower; E. associations in the habitat; F. bracteole; G. sepal; H. stamen; I. staminode; J. pistil; K. capsule; L. seed (dorsal-lateral view); M. seed (ventral view); N. seed (apical view); O. apical seed (dorsal-lateral view); P. apical seed (ventral view); Q–S Murdannia pauciflora Q. seed (dorsal-lateral view); R. apical seed (dorsal-lateral view); S. apical seed (ventral view). F,G,J,L,M & N from Joby, Rameshan & Toms 431; A,C,D,H,I,K,O & P from Joby, Rogi & Toms 434; Q, R & S from Joby 1004, Herbarium, School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala, India. Photographs by Joby Paul; camera: Nikon D70S, Labomed CSM2 Microscope and Magnüs MIPS.Published as part of Paul, Joby, Augustine, Toms, Thomas, Rogimon P. & Unni, K. Sankaran, 2011, Murdannia satheeshiana-a new species of Commelinaceae from the Western Ghats, India, pp. 41-46 in Phytotaxa 22 (1) on page 44, DOI: 10.11646/phytotaxa.22.1.3, http://zenodo.org/record/477673
Synthesis of a rotaxane CuI Triazolide under aqueous conditions
No full textWe describe the serendipitous isolation of a stable, neutral, monomeric mechanically interlocked CuI triazolide under aqueous conditions. This “trapped” intermediate of the CuAAC catalytic cycle is sterically protected from reprotonation by the rotaxane architecture, which renders the CuI–C bond stable toward moisture and air—even carboxylic acids protonate the CuI–C bond only slowly. The isolation of this remarkably stable CuI organometallic points toward potential applications of mechanical bonding in the study of reactive intermediates
Iterative synthesis of oligo[n]rotaxanes in excellent yield
No full textWe present an operationally simple iterative coupling strategy for the synthesis of oligomeric homo- and hetero-[n]rotaxanes with precise control over the position of each macrocycle. The exceptional yield of the AT-CuAAC reaction, combined with optimized conditions that allow the rapid synthesis of the target oligomers, opens the door to the study of precision-engineered oligomeric interlocked molecules
Stepwise, Protecting Group Free Synthesis of [4]Rotaxanes
No full textDespite significant advances in the last three decades towards high yielding syntheses of rotaxanes, the preparation of systems constructed from more than two components remains a challenge. Herein we build upon our previous report of an active template copper-catalyzed azide-alkyne cycloaddition (CuAAC) rotaxane synthesis with a diyne in which, following the formation of the first mechanical bond, the steric bulk of the macrocycle tempers the reactivity of the second alkyne unit. We have now extended this approach to the use of 1,3,5-triethynylbenzene in order to successively prepare [2]-, [3]- and [4]rotaxanes without the need for protecting group chemistry. Whilst the first two iterations proceeded in good yield, the steric shielding that affords this selectivity also significantly reduces the efficacy of the active template (AT)-CuAAC reaction of the third alkyne towards the preparation of [4]rotaxanes, resulting in severely diminished yields
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Ultrastructural investigations of three stages of the sexual life history of Peridinium balticum (Pyrrhophyta)
No full textTypescript (photocopy).Peridinium balticum (Levander) Lemmermann is a binucleate dinoflagellate that harbors a photosynthetic chrysophyte. Two stages of the sexual life history, i.e. the gamete and zygote, were investigated using light and electron microscopy. Cytological features of these stages were compared with morphological and ultrastructural characteristics of the vegetative cell using information in the literature and from this study. A re-examination of the vegetative cell resulted in new information about five organelles. These included the endoplasmic reticulum (ER), trichocysts, peripheral vacuoles, Golgi apparatus, and cytoskeletal system. Gamete production was induced by transferring vegetative cells to a nitrogen deficient medium. Gametes were 10-15 ��m in size and gymnodinioid in shape. Newly emerged gametes had a clear cytoplasm and few chloroplasts. Ultrastructurally, gametes were similar to vegetative cells, the major difference being chloroplast structure and thylakoid arrangement. Thylakoids were composed mostly of single lamellae. Often osmiophilic globules and pyrenoids were absent. Two morphologically distinct stages of the zygote were recognized and designated stage A and stage B. Stage A zygotes represented an early stage of fusion between gametes. They were a figure-8 in shape and had a pinwheel spin. Gamete position during fusion was specific, i.e. sulcal region ot apical region. Thecal plates invaginated along the length of the zygote and were dissolved, as were plates at the point of gamete contact. The dinokaryotic nuclei fused first and dissected chromosomes were observed in these nuclei. Stage B zygotes were elongated and were characterized by the two X-shaped fused cingula. Division of the fused dinokaryotic nucleus occurred at this stage; fusion of the eukaryotic nuclei followed. Changes observed concerning the fused eukaryotic nuclei included: (1) condensation of chromatin, (2) crystalline rod formation, and (3) a concentration of a less dense symbiont cytoplasm around the eukaryotic nucleus. This study provides evidence that significant morphological changes occur in the eukaryotic nucleus during zygote development. Therefore, it may be inferred that this nucleus is not completely passive in sexual reproduction, as opposed to its reported passive state during mitotic division
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
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