Synthesis of α-Fluoro-β-lactones and Their Thermal Conversion to 1-Fluoroalkenes

2002 ◽  
Vol 67 (9) ◽  
pp. 1325-1334 ◽  
Author(s):  
Rogelio Ocampo ◽  
William R. Dolbier ◽  
Fabio Zuluaga
Keyword(s):  
Spectroscopic Properties ◽  
Thermal Conversion ◽  
Hydroxy Acids ◽  
Preliminary Results ◽  
First Time

α-Fluoro-β-lactones have been synthesized and isolated for the first time from α-fluoro-β-hydroxy acids by using the couple TsCl/DMAP as lactonization agent. A detailed description of the synthesis and spectroscopic properties of α-fluoro-β-lactones is presented. Preliminary results indicate that thermolysis of these new β-lactones produces 1-fluoroalkenes.

Spider diversity in the Bukit Timah Nature Reserve, Singapore

2019 ◽  
Vol 71 ((suppl.1)) ◽  
pp. 209-243
Author(s):  
J.K.H. Koh ◽  
D.J. Court
Keyword(s):  
Nature Reserve ◽  
New Records ◽  
Secondary Forest ◽  
Distinct Species ◽  
Primary Forest ◽  
Preliminary Results ◽  
Vegetation Zones ◽  
Comprehensive Survey ◽  
Quantitative Analyses ◽  
First Time

This paper discusses the preliminary results of the first comprehensive survey of the spiders of the Bukit Timah Nature Reserve (BTNR) in Singapore. Two plots were established in each of the three zones of vegetation, viz., primary forest, old secondary forest, and maturing secondary forest. They were repeatedly sampled over an 18-month period. Sorting of the collection so far suggests that the three vegetation zones harbour rather different spider assemblages. Only ~9% of the total spider fauna recovered was shared by all three zones. The results have also yielded a preliminary picture of dominance, abundance and rarity. Although first intended to obtain a baseline for future quantitative analyses, the survey became a testing ground to modify and refine methodology so as to conduct future quantitative surveys with greater scientific rigour. Taxonomic work on the samples so far shows that the spiders in the BTNR span over 43 families, of which six families are listed for the first time in Singapore. The tally is summarised in an interim checklist of BTNR spiders. The checklist, with a total of 317 entries, shows that there are 158 described species of spiders in BTNR, of which 25 species are new records for Singapore. Another 159 morphospecies are provisionally recognised as distinct species, some of which may be new to science. Our observations during the survey have allowed us to provide a narrative of BTNR spider diversity against a backdrop of their microhabitat specialisation.

TRANSMISSION ELECTRON MICROSCOPY OF SURFACE AND INTERFACIAL STEPS

1997 ◽  
Vol 04 (03) ◽  
pp. 559-566 ◽  
Author(s):  
J. M. GIBSON ◽  
X. CHEN ◽  
O. POHLAND
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Free Surface ◽  
Significant Loss ◽  
Stress Fields ◽  
Preliminary Results ◽  
Surface Steps ◽  
Transmission Electron ◽  
First Time

Transmission electron microscopy is uniquely able to extend techniques for imaging free surface steps to the buried interface regime, without significant loss of detail. Two mechanisms for imaging surface and interfacial steps by transmission electron microscopy are described. They are thickness contrast and strain contrast. The former reveals the position and approximate height of steps, whereas the latter detects stress fields which are commonly associated with steps. The basis for each of these methods is elaborated, and preliminary results are shown for step images at Si/SiO2 interfaces, where measurable stress fields have been directly detected for the first time.

Growth, thermal, and spectroscopic properties of a 2.911 μm Yb,Ho:GdYTaO4 laser crystal

CrystEngComm ◽  
2014 ◽  
Vol 16 (48) ◽  
pp. 11007-11012 ◽  
Author(s):  
Renqin Dou ◽  
Qingli Zhang ◽  
Dunlu Sun ◽  
Jianqiao Luo ◽  
Huajun Yang ◽  
...  
Keyword(s):  
Laser Crystal ◽  
Czochralski Method ◽  
Spectroscopic Properties ◽  
First Time

A promising 2.911 μm Yb,Ho:GdYTaO4 laser crystal was grown successfully by the Czochralski method for the first time.

scholarly journals The sanctuary of Punta Stilo at Kaulonia-Monasterace (Rc, Italy): preliminary results of the close range photogrammetric surveys 2012-2013

2014 ◽  
Vol XL-5 ◽  
pp. 559-563
Author(s):  
E. Taccola ◽  
M. C. Parra ◽  
C. Ampolo
Keyword(s):  
Preliminary Results ◽  
3D Data ◽  
Close Range ◽  
The University ◽  
First Time

During the 2012–2013 excavations at the Sanctuary of Punta Stilo at Kaulonia, carried out by the University of Pisa and the Scuola Normale Superiore of Pisa, close range aerial and terrestrial photogrammetric surveys were tested for the first time. The aim of the test was to verify the accuracy of the site planimetry currently used, dating back also to a century ago. The 3D data obtained have allowed new data to be acquired for correcting and updating the mapping of the site.

Ebatronics: A New Paradigm for Experimental Laboratory in Applied Science and Technology

2021 ◽  
Vol 03 (04) ◽  
Author(s):  
Maide Bucolo ◽  
Arturo Buscarino ◽  
Luigi Fortuna ◽  
Salvina Gagliano
Keyword(s):  
Science And Technology ◽  
Applied Science ◽  
New Paradigm ◽  
Recycled Materials ◽  
New Approach ◽  
The Real ◽  
Preliminary Results ◽  
Experimental Laboratory ◽  
Laboratory Experiences ◽  
First Time

In this paper, the main concepts and the preliminary results related to a new approach for creating innovative green laboratory experiences in applied science and technology will be discussed. The term ebatronics is here introduced for the first time in the literature to indicate a kind of experimental laboratory based on the conjunction of wooden recycled materials and microcontroller based devices. In particular, tensegrity based systems are presented. A gallery of prototypes developed by the authors is shown. An intense set of photos will illustrate the real effectiveness of the proposed laboratory project.

A phthalocyanine–subphthalocyanine heterodinuclear dimer: comparison of spectroscopic properties with those of homodinuclear dimers of constituting units

2014 ◽  
Vol 50 (23) ◽  
pp. 3040-3043 ◽  
Author(s):  
Norio Shibata ◽  
Satoru Mori ◽  
Masamichi Hayashi ◽  
Masashi Umeda ◽  
Etsuko Tokunaga ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
X Ray ◽  
X Ray Crystallography ◽  
First Time

A phthalocyanine–subphthalocyanine heterodinuclear dimer has been disclosed for the first time with its unique flat-bowl-shaped structure revealed by X-ray crystallography.

Measuring Radon and Thoron Levels in Sri Lanka

2013 ◽  
Vol 718-720 ◽  
pp. 721-724
Author(s):  
Deepal Subasinghe Nalaka ◽  
Mahakumara Prasad ◽  
Thusitha B. Nimalsiri ◽  
Nuwan B. Suriyaarchchi ◽  
Takeshi Iimoto ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Environmental Conditions ◽  
In Situ Measurements ◽  
Physical Factors ◽  
Preliminary Results ◽  
Radon Measurements ◽  
First Time

For the first time in Sri Lanka, an attempt was made to measure the outdoor radon levels using CR 39 type passive radon detectors. Preliminary results indicate that in Sri Lanka, 220Rn isotope is more abundance than 222Rn isotope. These results were also confirmed by in-situ measurements. Sri Lanka has one of the highest 220Rn values in the region. It was also noted that environmental conditions and other physical factors have a significant effect on the outdoor radon measurements using passive discriminative detectors.

scholarly journals A Magnetohydrodynamic Model of Galaxy Formation

1997 ◽  
Vol 163 ◽  
pp. 797-798
Author(s):  
J. P. Sleath ◽  
A. H. Nelson
Keyword(s):  
Active Galactic Nuclei ◽  
Galaxy Formation ◽  
3D Model ◽  
Galactic Nuclei ◽  
Preliminary Results ◽  
Magnetohydrodynamic Model ◽  
The Creation ◽  
First Time

AbstractWe present a full 3D model of galaxy formation, incorporating for the first time magnetohydrodynamical effects. By this means we hope to simulate the creation of active galactic nuclei, including jets. Preliminary results are encouraging.

Failaka Archaeological Research Project. Preliminary results after the first season of excavation at the Kharaib el-Desht site in 2013/ Appendix 1: Kharaib el-Desht 2013: pottery. Preliminary report/ Appendix 2: Survey of Kharaib el-Desht Bay on Failaka Island: preliminary report

2016 ◽  
Vol XXIV (1) ◽  
pp. 560-589
Author(s):  
Agnieszka Pieńkowska ◽  
Marta Mierzejewska ◽  
Magdalena Nowakowska
Keyword(s):  
Preliminary Report ◽  
Educational Opportunities ◽  
Archaeological Sites ◽  
Archaeological Research ◽  
Documentary Evidence ◽  
Research Project ◽  
Islamic Period ◽  
Preliminary Results ◽  
Failaka Island ◽  
First Time

The site of Kharaib el-Desht on Failaka Island, Kuwait, was explored by an archaeological Kuwaiti–Polish team for the first time in 2013. The project included a survey and underwater archaeological research. Preliminary results indicate a dating of the site to the late Islamic period. Pottery collected from the survey of the site and from the excavations has been studied in a sepearate appendix to this report. As for the underwater and waterfront archaeology project, the main objective was to locate and describe seashore archaeological sites, provide documentary evidence and manage proper preservation of the discoveries in order to further educational opportunities.

scholarly journals Temperature shock tolerance and heat shock proteins in Arctic freshwater ostracod Candona rectangulata - preliminary results

2012 ◽  
Vol 33 (2) ◽  
pp. 199-206 ◽  
Author(s):  
Barbara Wojtasik ◽  
Dorota Kuczyńska-Wiśnik
Keyword(s):  
Heat Shock ◽  
Heat Shock Proteins ◽  
Protein Profile ◽  
Model Organism ◽  
Arctic Water ◽  
Temperature Shock ◽  
Temperature Changes ◽  
Preliminary Results ◽  
Shock Proteins ◽  
First Time

Temperature shock tolerance and heat shock proteins in Arctic freshwater ostracod Candona rectangulata - preliminary results Candona rectangulata is an ostracod species common in cold (<15°C) shallow freshwater Arctic water bodies. This species is useful in palaeolimnological studies because only few known autecological data can be applied in reconstructions of palaeoclimate. Particular attention was paid to the temperature, which is the basic factor determining the geographic range of a species. In this study a wide tolerance of C. rectangulata to the temperature was demonstrated for the first time. Its high tolerance to the temperature changes seems to be based on induction of set of proteins belonging to the family of heat shock proteins. Using PAGE-SDS electrophoresis variation in the protein profile of non-model organism undergoing stress in the field (South Spitsbergen, near Stanisław Siedlecki Polish Polar Station) and in laboratory cultures was presented. These results could explain the eurythermic range of C. rectangulata and its good adaptation to the environmental conditions which normally do not exist in Arctic freshwater ponds.

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