First-Time-into-New-Population Studies

2010 ◽  
pp. 125-138
Keyword(s):  
Population Studies ◽  
First Time

scholarly journals Radio counterparts of gamma-ray pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 87-92
Author(s):  
L. Guillemot
Keyword(s):  
Gamma Ray ◽  
Population Studies ◽  
Radio Observations ◽  
Large Area ◽  
Millisecond Pulsars ◽  
Follow Up Studies ◽  
First Time

AbstractObservations of pulsars with the Large Area Telescope (LAT) on the Fermi satellite have revolutionized our view of the gamma-ray pulsar population. For the first time, a large number of young gamma-ray pulsars have been discovered in blind searches of the LAT data. More generally, the LAT has discovered many new gamma-ray sources whose properties suggest that they are powered by unknown pulsars. Radio observations of gamma-ray sources have been key to the success of pulsar studies with the LAT. For example, radio observations of LAT-discovered pulsars provide constraints on the relative beaming fractions, which are crucial for pulsar population studies. Also, radio searches of LAT sources with no known counterparts have been very efficient, with the discovery of over forty millisecond pulsars. I review radio follow-up studies of LAT-discovered pulsars and unidentified sources, and discuss some of the implications of the results.

First record of Rhyacophila pubescensPictet, 1834 (Trichoptera: Rhyacophilidae) in the Republic of North Macedonia with notes on its ecology and distribution

2020 ◽  
Vol 31 ◽  
pp. 28-34
Author(s):  
Valentina Slavevska-Stamenković ◽  
Jelena Hinić ◽  
Ioannis Karaouzas ◽  
Halil Ibrahimi ◽  
Danijela Mitić-Kopanja ◽  
...  
Keyword(s):  
Central Europe ◽  
Population Studies ◽  
Balkan Peninsula ◽  
First Record ◽  
Valuable Source ◽  
Ecological Preferences ◽  
First Time ◽  
Source Of Information

The caddisfly species Rhyacophila pubescens Pictet, 1834 is reported from R. North Macedonia for the first time. Our investigations showed the presence of this species at only one locality at Osogovo Mountain, above the Sasa mine. R. pubescens is commonly distributed in Central Europe but has been rarely found in the southeastern parts of the continent. This record marks the southernmost occurrence of this species in the Balkan Peninsula and increases the number of Rhyacophila species of R. North Macedonia to seventeen. The results obtained in our study a) provide information on the distribution of R. pubescens in the Balkan Peninsula; b) comment on the ecological preferences of the species and c) serve as a valuable source of information for further biodiversity and population studies.

scholarly journals The complexity of HLA-DS molecules. A homozygous cell line expresses multiple HLA-DS alpha chains.

1984 ◽  
Vol 159 (5) ◽  
pp. 1512-1531 ◽  
Author(s):  
R W Karr ◽  
C Alber ◽  
S M Goyert ◽  
J Silver ◽  
R J Duquesnoy
Keyword(s):  
Monoclonal Antibodies ◽  
Cell Line ◽  
Cell Lines ◽  
Gel Electrophoresis ◽  
Population Studies ◽  
Alpha Chain ◽  
Gene Level ◽  
First Time

Ia molecules expressed by an HLA-DRw6 homozygous cell line were immunoprecipitated with anti-Ia allosera and monoclonal antibodies and analyzed by 2-D gel electrophoresis. The DRw6 homozygous cell line was shown to express two DS beta chains; this observation extends our previous finding that a DR5 homozygous cell line expresses two DS beta chains and suggests that the expression of at least two DS beta chains by DR homozygous cell lines is a generalized phenomenon. The data presented here document for the first time that a DR homozygous cell line expresses at least two DS alpha chains. Therefore, this cell line expresses at least two DS molecules with the potential for the expression of four DS molecules. In agreement with previous reports, the cell line was shown to express two DR beta chains and one DR alpha chain that combine to form two DR molecules. The molecular specificities of two MB1 allosera and two MB1 -like monoclonal antibodies were also compared in these studies. Both MB1 allosera isolated a single DS molecule, while the MB1 -like monoclonal antibodies isolated at least two DS molecules. Therefore, these studies document for the first time that anti-Ia reagents which are specific for the MB1 or MB1 -like determinants in population studies do not recognize the same Ia molecules in immunochemical studies. The data presented here for the expression of at least two DS alpha chains and the location of the MB1 allodeterminant on only one of multiple DS molecules are in agreement with recent studies at the gene level.

scholarly journals Classical Novae as Supersoft X-ray Sources in the Andromeda Galaxy

2011 ◽  
Vol 7 (S281) ◽  
pp. 105-112
Author(s):  
Martin Henze ◽  
Wolfgang Pietsch ◽  
Frank Haberl ◽  
Margarita Hernanz ◽  
Gloria Sala ◽  
...  
Keyword(s):  
Population Studies ◽  
Optical Parameters ◽  
X Rays ◽  
X Ray ◽  
Classical Novae ◽  
Andromeda Galaxy ◽  
First Results ◽  
M 31 ◽  
First Time ◽  
High Cadence

AbstractWe review the first results of a dedicated, on-going monitoring project for supersoft X-ray source (SSS) states of classical novae (CNe) in the central region of the Andromeda galaxy (M 31). So far, during three high-cadence observation campaigns with the X-ray telescopes XMM-Newton and Chandra from 2006 until 2009 we detected 21 CNe, only four of which were seen in X-rays before. This increased the total number of known CNe with X-ray counterparts in M 31 to 60, which is significantly larger than for any other galaxy, including the Milky Way. We compiled a catalog of X-ray and optical properties for these 60 sources which allowed us to perform source statistics and population studies of CNe with SSS state in M 31 for the first time. Here we review the results of this analysis: (i) several correlations between X-ray and optical parameters, (ii) an analysis of the intrinsic fraction of CNe with SSS state, and (iii) the first nova population study in X-rays. Our first results are promising, however a continuing monitoring of the unique target M 31 is strongly needed to extend this valuable data base and to refine the early statements and predictions.

scholarly journals Flucytosine Resistance Is Restricted to a Single Genetic Clade of Candida albicans

2004 ◽  
Vol 48 (1) ◽  
pp. 262-266 ◽  
Author(s):  
Claude Pujol ◽  
Michael A. Pfaller ◽  
David R. Soll
Keyword(s):  
South Africa ◽  
Candida Albicans ◽  
Population Studies ◽  
The Other ◽  
United State ◽  
Group I ◽  
Group Ii ◽  
First Time

ABSTRACT Population studies have revealed that Candida albicans can be separated into five major clades, groups I, II, III, SA, and E. Groups SA and E are highly prevalent in South Africa and Europe, respectively, while group II is excluded from the southwestern portion of the United State. In each geographical locale, several clades exist side by side, suggesting little interclade recombination. These results suggest clade-specific phenotypes. In the present study we demonstrate that resistance to flucytosine (5FC MIC ≥ 32 μg/ml), an antifungal used for the treatment of systemic C. albicans infections, is restricted to clade I. In addition, while 97% of all strains for which 5FC MICs were ≥0.5 μg per ml were members of group I, only 3% were members of the other groups. 5FC MICs were ≥0.5 μg per ml for 72% of all group I isolates, while 5FC MICs were ≥0.5 μg per ml for only 2% of all non-group I isolates. These results demonstrate for the first time the clade specificity of a clinically relevant trait (5FC resistance) and suggest that while intraclade recombination may be common, interclade recombination is rare.

scholarly journals An Evaluation of the Genetic Structure of Geese Maintained in Poland on the Basis of Microsatellite Markers

Animals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 737 ◽  
Author(s):  
Warzecha ◽  
Oczkowicz ◽  
Rubis ◽  
Fornal ◽  
Szmatoła ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Genetic Variability ◽  
Microsatellite Markers ◽  
Polymorphism Information Content ◽  
Population Studies ◽  
Molecular Level ◽  
Microsatellite Data ◽  
Expected Heterozygosity ◽  
First Time

The aim of this study was to evaluate the genetic variability of the White Kołuda® goose and 12 conservative flocks: Kielecka, Podkarpacka, Garbonosa, Pomerian, Rypinska, Landes, Lubelska, Suwalska, Kartuska, Romanska, Slowacka, and Kubanska, maintained in Poland using microsatellite data. The genetic diversity of geese kept in Poland remains poorly analyzed at the molecular level. In total 392 samples were examined with the usage of 15 microsatellite markers. 119 alleles were identified and the number of alleles per locus ranged from 1 to 13. The highest number of alleles was observed in TTUCG5 (16) and the lowest in CAUD-G007 (2), while CKW47 was monomorphic. The lowest value of expected heterozygosity (He) was observed in Landes, while the highest in Romanska. Similarly, the observed heterozygosity (Ho) was the lowest in Landes but the highest in Kartuska. The polymorphism information content (PIC) indicates loci TTUCG5 as the most valuable microsatellite marker among those examined. The Structure software was used for the first time to identify goose populations, revealing high admixture between breeds and their close genetic propinquity. Moreover, the presented panel of microsatellite markers remained polymorphic and is useful for population studies of geese and assessment of genetic diversity.

scholarly journals Perceptions of Gender Equality among Icelandic Year 10 Adolescents: Population Studies 1992, 2006, and 2014

Adolescents ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 294-305
Author(s):  
Einar Baldvin Thorsteinsson ◽  
Andrea Sigrún Hjálmsdóttir ◽  
Thoroddur Bjarnason
Keyword(s):  
Gender Roles ◽  
Gender Equality ◽  
Health Behaviour ◽  
Population Studies ◽  
School Aged Children ◽  
First Time

The aim of this research is to outline, for the first time, the changes in attitudes towards gender equality among 10th graders in Iceland based on data obtained from the Health Behaviour in School-aged Children (HBSC) in 1992, 2006, and 2014. The sampling proportions were high (85.1% in 1992, 43.2% in 2006, and 77.9% in 2014), thereby reflecting parameters (population values) rather than statistics (sample values). Boys and girls are viewing gender roles as being more equal with time, while, concurrently, girls tend to have more gender-equal attitudes than boys. The present paper provides an unparalleled examination of changes in attitudes towards gender equality. After a backlash in adolescents’ attitudes, revealed in the 2006 study, there are positive signs of more gender-equal attitudes in the 2014 results.

Annulate lamellae in the Sertoli cells of guinea pig testis after unilateral torsion of the spermatic cord

1984 ◽  
Vol 42 ◽  
pp. 196-197
Author(s):  
J. Chakraborty ◽  
A. P. Sinha Hikim ◽  
J. S. Jhunjhunwala
Keyword(s):  
Sertoli Cells ◽  
Guinea Pigs ◽  
Spermatic Cord ◽  
Present Report ◽  
Cell Types ◽  
Annulate Lamellae ◽  
Spermatogenic Cells ◽  
Electron Microscopic ◽  
Structural Details ◽  
First Time

Although the presence of annulate lamellae was noted in many cell types, including the rat spermatogenic cells, this structure was never reported in the Sertoli cells of any rodent species. The present report is based on a part of our project on the effect of torsion of the spermatic cord to the contralateral testis. This paper describes for the first time, the fine structural details of the annulate lamellae in the Sertoli cells of damaged testis from guinea pigs.One side of the spermatic cord of each of six Hartly strain adult guinea pigs was surgically twisted (540°) under pentobarbital anesthesia (1). Four months after induction of torsion, animals were sacrificed, testes were excised and processed for the light and electron microscopic investigations. In the damaged testis, the majority of seminiferous tubule contained a layer of Sertoli cells with occasional spermatogonia (Fig. 1). Nuclei of these Sertoli cells were highly pleomorphic and contained small chromatinic clumps adjacent to the inner aspect of the nuclear envelope (Fig. 2).

Electron spectroscopic imaging and diffraction

1991 ◽  
Vol 49 ◽  
pp. 706-707
Author(s):  
M. Rühle ◽  
J. Mayer ◽  
J.C.H. Spence ◽  
J. Bihr ◽  
W. Probst ◽  
...  
Keyword(s):  
Materials Science ◽  
Electron Spectroscopic Imaging ◽  
Magnetic Filter ◽  
Magnetic Imaging ◽  
Illumination System ◽  
Probe Size ◽  
Diffraction Patterns ◽  
Fritz Haber ◽  
Koehler Illumination ◽  
First Time

A new Zeiss TEM with an imaging Omega filter is a fully digitized, side-entry, 120 kV TEM/STEM instrument for materials science. The machine possesses an Omega magnetic imaging energy filter (see Fig. 1) placed between the third and fourth projector lens. Lanio designed the filter and a prototype was built at the Fritz-Haber-Institut in Berlin, Germany. The imaging magnetic filter allows energy-filtered images or diffraction patterns to be recorded without scanning using efficient area detection. The energy dispersion at the exit slit (Fig. 1) results in ∼ 1.5 μm/eV which allows imaging with energy windows of ≤ 10 eV. The smallest probe size of the microscope is 1.6 nm and the Koehler illumination system is used for the first time in a TEM. Serial recording of EELS spectra with a resolution < 1 eV is possible. The digital control allows X,Y,Z coordinates and tilt settings to be stored and later recalled.

A Novel TEM Technique for Characterizing As-Grown CVD Diamond Films

1991 ◽  
Vol 49 ◽  
pp. 956-957 ◽  
Author(s):  
Z.L. Wang ◽  
J. Bentley ◽  
R.E. Clausing ◽  
L. Heatherly ◽  
L.L. Horton
Keyword(s):  
Diamond Films ◽  
Chemical Vapor ◽  
Growth Direction ◽  
Dark Field ◽  
Growth Surface ◽  
Specimen Preparation ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
First Time ◽  
Microstructural Studies

Microstructural studies by transmission electron microscopy (TEM) of diamond films grown by chemical vapor deposition (CVD) usually involve tedious specimen preparation. This process has been avoided with a technique that is described in this paper. For the first time, thick as-grown diamond films have been examined directly in a conventional TEM without thinning. With this technique, the important microstructures near the growth surface have been characterized. An as-grown diamond film was fractured on a plane containing the growth direction. It took about 5 min to prepare a sample. For TEM examination, the film was tilted about 30-45° (see Fig. 1). Microstructures of the diamond grains on the top edge of the growth face can be characterized directly by transmitted electron bright-field (BF) and dark-field (DF) images and diffraction patterns.

Sign in / Sign up

Export Citation Format

Share Document