Some Good Reasons to Use Matched Filters for the Detection of Point Sources in CMB Maps

In this draft we comment on the results concerning the performances of matched filters, scale adaptive filters and Mexican hat wavelet that recently appeared in literature in the context of point source detection in Cosmic Microwave Background maps. In particular, we show that, contrary to what has been claimed, the use of the matched filters still appear to be the most reliable and efficient method to disantangle point sources from the backgrounds, even when using detection criterion that, differently from the classic $n\sigma$ thresholding rule, takes into account not only the height of the peaks in the signal corresponding to the candidate sources but also their curvature.Comment: Replacement after submission to A&A and referee's comments. Astronomy and Astrophysics, in press, JNL/2003/473

Why did Supernova 1054 shine at late times?

The Crab nebula is the remnant of supernova 1054 (SN 1054). The progenitor of this supernova has, based on nucleosynthesis arguments, been modeled as an 8-10 solar mass star. Here we point out that the observations of the late light curve of SN 1054, from the historical records, are not compatible with the standard scenario, in which the late time emission is powered by the radioactive decay of small amounts of Ni-56. Based on model calculations we quantify this discrepancy. The rather large mass of Ni-56 needed to power the late time emission, 0.06[-0.03,+0.02] solar masses, seems inconsistent with abundances in the Crab nebula. The late light curve may well have been powered by the pulsar, which would make SN 1054 unique in this respect. Alternatively, the late light curve could have been powered by circumstellar interaction, in accordance with scenarios in which 8-10 solar mass stars are progenitors to `dense wind' supernovae.Comment: 5 pages, 2 figures. Accepted for publication in A&

Studies on the inheritance of resistance to crown gall disease of grapevine

Nearly 1800 seedlings of 27 hybrid families were screened for resistance to A. tumefaciens strain AT-1 belonging to biotype 3. The tested families included 12 crosses of sensitive and of resistant phenotypes, and 15 self-pollinated families both of sensitive and of resistant parents. Resistance originated from V. amurensis. The segregation ratio corresponded to 1 : 1 among the crosses and was 3 : 1 (resistant to sensitive) among the selfings of resistant parents. All seedlings from selved susceptible parents formed tumors. According to our results, a Mendelian dominant inheritance can be proposed for resistance to A. tumefaciens strain AT-1.Untersuchungen zur Vererbung der Mauke-Resistenz bei der RebeAnnähernd 1800 Genotypen aus 27 Kreuzungsfamilien wurden auf ihre Anfälligkeit gegen den Stamm AT-1 des Biotyps 3 von Agrobacterium tumefaciens geprüft. Die untersuchten Kreuzungsfamilien umfaßten 12 Kreuzungskombinationen resistenter und anfälliger Phänotypen und 15 Selbstungen resistenter und anfälliger Eltern. Die Quelle der Mauke-Resistenz ist Vitis amurensis. Das Aufspaltungsverhältnis zwischen resistenten und anfälligen Sämlingen beträgt bei Fremdbefruchtung 1 : 1 und bei Selbstung der resistenten Eltern 3 : 1; bei Selbstung der anfälligen Eltern bildete jeder Sämling Tumoren aus. Aufgrund der Ergebnisse kann eine dominante Vererbung der Resistenz gegen A. tumefaciens AT-1 angenommen werden

SN 1998bw at late phases

We present observations of the peculiar supernova SN 1998bw, which was probably associated with GRB 980425. The photometric and spectroscopic evolution is monitored up to 500 days past explosion. We also present modeling based on spherically symmetric, massive progenitor models and very energetic explosions. The models allow line identification and clearly show the importance of mixing. From the late light curves we estimate that about 0.3-0.9 solar masses of ejected Nickel-56 is required to power the supernova.Comment: With 3 figures Accepted for ApJ Letter

Inheritance of isoenzymes and soluble proteins in grape varieties and F1 hybrids

The aim or our experiments was to verify the existence of a genetically interpretable molecular polymorphism in several grape varieties and their F1 hybrids, which we can employ for genetical and ampelographical characterization. In addition, we also programmed the progress of investigation methods. The authors present protein and enzyme analysis of two pairs of parents, Pearl of Csaba x S. V. 12375 and Saperavi x Blaufrankisch, and of ten other cultivars and several F1 progenies. The best experimental results for genetic markers can be gained when shoot and callus samples are collected at the end of winter, in February, at the same time. Spring shoot collection is less effective because of high chlorophyll contents, and must and wine samples are less suitable due to their microbial contamination. The esterase enzyme group gives well reproducible, characteristically differentiated patterns. The enzyme patterns of parental varieties typically segregate in individual progenies, hence they prove to be good markers

Extraantherale Loculamente in der Blüte der Weinrebe

Beim anatomisch histologischen Studium der Blütentypen der Sorten Kadarka, Furmint und Isabella wurde festgestellt, daß sich Pollensäcke nicht nur in der normalen Anthere der Rebenblüte, sondern auch außerhalb der Anthere, vor allem im Stempel bilden können; diese werden als extraantherale Loculamente bezeichnet.Die extraantheralen Loculamente bilden sich in teratologischen Blüten (pseudogynoide, sternartig sich öffnende, in partiell fertilen und völlig sterilen, sowie in vollkommenen 9 Blüten). Sie sind in der Narbe, im Griffelkanal, in der Fruchtknotenwand, in den aus der Fruchtknotenwand und der Scheidewand sich entwickelnden Gewebefortsätzen und im NuceHus der Samenanlage zu finden.Die Pollensäcke werden in einigen Fällen von 2-8 Zellreihen umschlossen, die bei der Blüte nicht aufbrechen. Ihre Innenseite bildet ein 1-2 Zellreihen kräftiges Tapetum. Es gibt aber auch Loculamente, die ein zum Ö,ffnen fähiges Exo- und Endothecium von normaler Ausbildung besitzen. Die im Loculament bei der Blüte vorgefundenen Vermehrungsgebilde sind teils Archesporen, Mikrosporenmutterzellen, Tetraden, M1krosporen und ausgebildete Pollenkörner. Dies weist darauf hin, daß sich die extraantheralen Loculamente in verschiedenen Stadien der Blütenmorphogenese zu differenzieren beginnen.Die Existenz der bisher beschriebenen vollkommenen 9 Blüten ist fraglich, da auch in diesen nach den vorliegenden Beobachtungen in irgendeinem Teil des Stempels Loculamente zu finden sind

Evolution equation for a model of surface relaxation in complex networks

In this paper we derive analytically the evolution equation of the interface for a model of surface growth with relaxation to the minimum (SRM) in complex networks. We were inspired by the disagreement between the scaling results of the steady state of the fluctuations between the discrete SRM model and the Edward-Wilkinson process found in scale-free networks with degree distribution $P(k) \sim k^{-\lambda}$ for $\lambda <3$ [Pastore y Piontti {\it et al.}, Phys. Rev. E {\bf 76}, 046117 (2007)]. Even though for Euclidean lattices the evolution equation is linear, we find that in complex heterogeneous networks non-linear terms appear due to the heterogeneity and the lack of symmetry of the network; they produce a logarithmic divergency of the saturation roughness with the system size as found by Pastore y Piontti {\it et al.} for $\lambda <3$.Comment: 9 pages, 2 figure

Genetic diversity among twelve grape cultivars indigenous to the Carpathian Basin revealed by RAPD markers

Twelve cultivars (Vitis vinifera L.) were subjected to RAPD analysis in order to estimate the genetic diversity among these genotypes and to analyse their genetic relationships. The study was performed using 28 primers that generated 120 polymorphic fragments. There was genetic variation among the cultivars with values of genetic diversity ranging from 0.419 to 0.642 using the Jaccard coefficient. UPGMA analysis of distance matrix resulted in a dendrogram with three clusters. The dendrogram shows that the cultivars of our study can be distinguished to a relatively high degree. Results were compared with the taxonomic classification and with the synonyms of the cultivars. The RAPD technique was useful for identification and discrimination of these grape cultivars