Large scale isolation of nuclei and nucleoli from vitellogenic oocytes of Xenopus laevis

Chromosoma ◽  
1978 ◽  
Vol 66 (4) ◽  
pp. 299-308 ◽  
Author(s):  
Franco Scalenghe ◽  
Marino Buscaglia ◽  
Christine Steinheil ◽  
Marco Crippa
Keyword(s):  
Xenopus Laevis ◽  
Large Scale

scholarly journals Use of Large-Scale Expression Cloning Screens in the Xenopus laevis Tadpole to Identify Gene Function

2000 ◽  
Vol 228 (2) ◽  
pp. 197-210 ◽  
Author(s):  
Timothy C Grammer ◽  
Karen J Liu ◽  
Francesca V Mariani ◽  
Richard M Harland
Keyword(s):  
Xenopus Laevis ◽  
Gene Function ◽  
Large Scale ◽  
Expression Cloning ◽  
Xenopus Laevis Tadpole

Large scale isolation of nuclei from oocytes of Xenopus laevis

1989 ◽  
Vol 180 (1) ◽  
pp. 177-180 ◽  
Author(s):  
Ida Ruberti ◽  
Elena Beccari ◽  
Elisabetta Bianchi ◽  
Francesca Carnevali
Keyword(s):  
Xenopus Laevis ◽  
Large Scale

Platyhelminths from the South African Clawed Toad, or Platanna (Xenopus laevis)

1973 ◽  
Vol 47 (2) ◽  
pp. 199-235 ◽  
Author(s):  
William Macnae ◽  
Liebe Rock ◽  
Matthew Makowski
Keyword(s):  
Xenopus Laevis ◽  
South African ◽  
Large Scale ◽  
Developmental Stages ◽  
First Year ◽  
Pericardial Cavity ◽  
Large Numbers ◽  
South African Universities ◽  
In Captivity ◽  
Large Scale Survey

Since the discovery by Shapiro and Zwarenstein (1934) that females of Xenopus laevis (Daudin, 1802) respond to hormones present in the urine of pregnant women, this species of amphibian has proved to be a useful experimental animal. It is easily kept in captivity and can be reared through all its developmental stages without difficulty.This species, the clawed toad or platanna, is commonly used in South African Universities as a type for first year dissection. This has given the opportunity to check large numbers of specimens for the more obvious parasites, i.e. those which live in the gallbladder, the urinary bladder, the peritoneal cavity and the pericardial cavity. A similar large scale survey of intraintestinal parasites has not been feasible, although many alimentary canals have been searched for parasites.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

Some applications of electron beam microanalysis techniques in VLSI process evaluation

1983 ◽  
Vol 41 ◽  
pp. 160-161
Author(s):  
Simon Thomas
Keyword(s):  
Integrated Circuits ◽  
Process Evaluation ◽  
Large Scale ◽  
Technology Development ◽  
Analytical Techniques ◽  
Successful Implementation ◽  
Analysis Of Failures ◽  
Characterization Of Materials ◽  
Circuits Vlsi

Trends in the technology development of very large scale integrated circuits (VLSI) have been in the direction of higher density of components with smaller dimensions. The scaling down of device dimensions has been not only laterally but also in depth. Such efforts in miniaturization bring with them new developments in materials and processing. Successful implementation of these efforts is, to a large extent, dependent on the proper understanding of the material properties, process technologies and reliability issues, through adequate analytical studies. The analytical instrumentation technology has, fortunately, kept pace with the basic requirements of devices with lateral dimensions in the micron/ submicron range and depths of the order of nonometers. Often, newer analytical techniques have emerged or the more conventional techniques have been adapted to meet the more stringent requirements. As such, a variety of analytical techniques are available today to aid an analyst in the efforts of VLSI process evaluation. Generally such analytical efforts are divided into the characterization of materials, evaluation of processing steps and the analysis of failures.

Electron microscopy study of reactively sputter-deposited Ti/N films on silicon

1992 ◽  
Vol 50 (2) ◽  
pp. 1362-1363
Author(s):  
V. C. Kannan ◽  
A. K. Singh ◽  
R. B. Irwin ◽  
S. Chittipeddi ◽  
F. D. Nkansah ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Large Scale ◽  
Hexagonal Phase ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Process Conditions ◽  
Tin Films ◽  
Wide Range ◽  
Fcc Phase ◽  
Circuits Vlsi

Titanium nitride (TiN) films have historically been used as diffusion barrier between silicon and aluminum, as an adhesion layer for tungsten deposition and as an interconnect material etc. Recently, the role of TiN films as contact barriers in very large scale silicon integrated circuits (VLSI) has been extensively studied. TiN films have resistivities on the order of 20μ Ω-cm which is much lower than that of titanium (nearly 66μ Ω-cm). Deposited TiN films show resistivities which vary from 20 to 100μ Ω-cm depending upon the type of deposition and process conditions. TiNx is known to have a NaCl type crystal structure for a wide range of compositions. Change in color from metallic luster to gold reflects the stabilization of the TiNx (FCC) phase over the close packed Ti(N) hexagonal phase. It was found that TiN (1:1) ideal composition with the FCC (NaCl-type) structure gives the best electrical property.

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