AB3‐type molecular source for beam epitaxy

1975 ◽  
Vol 12 (4) ◽  
pp. 956-957 ◽  
Author(s):  
D. Kakati ◽  
B. D. Sharma
Keyword(s):  
Molecular Source

scholarly journals Diversity of Listeria Species in Urban and Natural Environments

2012 ◽  
Vol 78 (12) ◽  
pp. 4420-4433 ◽  
Author(s):  
Brian D. Sauders ◽  
Jon Overdevest ◽  
Esther Fortes ◽  
Katy Windham ◽  
Ynte Schukken ◽  
...  
Keyword(s):  
Urban Areas ◽  
Environmental Samples ◽  
Nearest Neighbor ◽  
Allelic Diversity ◽  
Urban Environments ◽  
Source Tracking ◽  
Natural Environments ◽  
Content Type ◽  
Molecular Source ◽  
Listeria Seeligeri

ABSTRACTA total of 442Listeriaisolates, including 234Listeria seeligeri, 80L. monocytogenes, 74L. welshimeri, 50L. innocua, and 4L. marthiiisolates, were obtained from 1,805 soil, water, and other environmental samples collected over 2 years from four urban areas and four areas representing natural environments.Listeriaspp. showed similar prevalences in samples from natural (23.4%) and urban (22.3%) environments. WhileL. seeligeriandL. welshimeriwere significantly associated with natural environments (P≤ 0.0001),L. innocuaandL. monocytogeneswere significantly associated with urban environments (P≤ 0.0001). Sequencing ofsigBfor all isolates revealed 67 allelic types with a higher level of allelic diversity among isolates from urban environments. SomeListeriaspp. andsigBallelic types showed significant associations with specific urban and natural areas. Nearest-neighbor analyses also showed that certainListeriaspp. andsigBallelic types were spatially clustered within both natural and urban environments, and there was evidence that these species and allelic types persisted over time in specific areas. Our data show that members of the genusListerianot only are common in urban and natural environments but also show species- and subtype-specific associations with different environments and areas. This indicates thatListeriaspecies and subtypes within these species may show distinct ecological preferences, which suggests (i) that molecular source-tracking approaches can be developed forListeriaand (ii) that detection of someListeriaspecies may not be a good indicator forL. monocytogenes.

Fabrication of SiC Films on Si(100) using a C60 molecular source

1994 ◽  
Vol 30 (12) ◽  
pp. 1007-1008 ◽  
Author(s):  
D. Chen ◽  
R. Workman ◽  
D. Sarid
Keyword(s):  
Molecular Source ◽  
Sic Films

Molecular Source Tracking and Molecular Subtyping

2019 ◽  
pp. 971-988 ◽  
Author(s):  
Peter Gerner-Smidt ◽  
Eija Trees ◽  
Heather Carleton ◽  
Lee Katz ◽  
Henk den Bakker ◽  
...  
Keyword(s):  
Source Tracking ◽  
Molecular Subtyping ◽  
Molecular Source

Molecular Source Tracking and Molecular Subtyping

2014 ◽  
pp. 1059-1077 ◽  
Author(s):  
Peter Gerner-Smidt ◽  
Eija Hyytia-Trees ◽  
Timothy J. Barrett
Keyword(s):  
Source Tracking ◽  
Molecular Subtyping ◽  
Molecular Source

Preparation and Characterization of Sic From Alkoxide-Derived Polymeric Precursors

1991 ◽  
Vol 249 ◽  
Author(s):  
Zhiping Jiang ◽  
Wendell E. Rhine
Keyword(s):  
Carbothermic Reduction ◽  
Pyrolysis Products ◽  
Polymeric Precursors ◽  
Polyfurfuryl Alcohol ◽  
Elemental Analyses ◽  
Molecular Source

ABSTRACTCrystalline SiC was prepared by carbothermic reduction of alkoxide-derived polymeric precursors under a flow of argon at 1400-1600°C. The pyrolysis products from the precursors with a molecular source of carbon, i.e., (R1)x(R2)ySiO1.5(Rl=phenyl; R2=propyl, vinyl), showed different morphologies from those of the precursors derived from TEOS and a polymeric source of carbon (polyfurfuryl alcohol). Furthermore, the pyrolysis chemistry of theses precursors and the microstructure of their corresponding pyrolysis products were studied by means of FTIR, TGA, XRD, SEM, BET, elemental analyses, etc.

scholarly journals Functionalization of the Si(1 1 1) 7 × 7 substrate with coronene molecules using simple molecular source

2018 ◽  
Vol 36 (1) ◽  
pp. 86-92
Author(s):  
Marta Przychodnia ◽  
Ryszard Czajka ◽  
Wojciech Koczorowski
Keyword(s):  
Scanning Tunneling Microscope ◽  
Molecular Beam ◽  
Scanning Tunneling ◽  
Published Data ◽  
Operational Parameters ◽  
Quadrupole Mass ◽  
Sublimation Temperature ◽  
Molecular Source ◽  
Evaporation Source ◽  
Source Operation

Abstract The present paper aims at describing a source designed and constructed to generate an organic molecular beam under ultrahigh vacuum conditions. The presented construction solution of the evaporation source allows for independent deposition of three different kinds of molecules. The probability of molecules fragmentation is minimized by using a thermocouple being in contact with a molecular crucible, which enables precise temperature control. In addition, cleanness and molecular beam density are monitored using a quadrupole mass spectrometer and quartz microbalance, respectively. The operational parameters of the molecular source are optimized and deposition rates are measured for the coronene molecule in the sublimation temperature range between 430 K and 460 K. The analysis of scanning tunneling microscope images of the Si(1 1 1) 7 × 7 substrate covered with the sub-monolayer of coronene molecules and comparison with previously published data has been used for verification of the molecular source operation.

scholarly journals Serine is the molecular source of the NH(CH2)2 bridgehead moiety of the in vitro assembled [FeFe] hydrogenase H-cluster

2020 ◽  
Vol 11 (5) ◽  
pp. 1241-1247 ◽  
Author(s):  
Guodong Rao ◽  
Lizhi Tao ◽  
R. David Britt
Keyword(s):  
Epr Spectroscopy ◽  
Isotope Labeling ◽  
Molecular Source

The CH2NHCH2 bridgehead moiety of the [FeFe] hydrogenase H-cluster is derived from serine as revealed by isotope labeling and EPR spectroscopy.

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