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Search Results: 1 - 10 of 200715 matches for " P. Gorla "
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Variación geográfica de la abundancia poblacional de Delphacodes kuscheli (Fennah) en la región central de Argentina
Grilli,Mariano P; Gorla,David E;
Ecolog?-a austral , 2002,
Abstract: delphacodes kuscheli is the vector of the río cuarto corn disease, which affects maize in central argentina. this disease is endemic of rio cuarto department in córdoba province. preliminary studies indicate that the insect is present in córdoba, la pampa, san luis, santa fe and buenos aires provinces, but there are few studies on the abundance in these places. previous research showed that delphacodes kuscheli arrives to maize plots from distant sources, and that there is a difference in the abundance of delphacodes kuscheli in the endemic area and outside it. in this work we study the geographic variations of the population abundance of delphacodes kuscheli along a transect that crosses the endemic area to verify whether there is a difference between the vector population dynamics within and outside the endemic area. samples of dispersing individual were collected during three years by using sticky traps at two different heights. the samples were taken in eight sampling sites between the localities of manfredi (córdoba) and mercedes (san luis). dispersive individuals of delphacodes kuscheli were more abundant in the endemic area than outside it. the dispersive population captured with low traps had a higher proportion of females, but there were no differences at high traps. the correlation of density changes observed in high traps decreased with distance between sampling sites, but there was no relationship for low traps. it is discussed how these results could indicate that delphacodes kuscheli is a species highly adapted to live in unstable habitats.
A new way of comparing double beta decay experiments
M. Biassoni,O. Cremonesi,P. Gorla
Physics , 2013,
Abstract: Many experiments whose goal is the search for neutrino-less double beta decay are taking data or in a final construction stage. The need for a tool that allows for an objective comparison between the sensitivity of different experiments is mandatory in order to understand the potential of the next generation projects and focus on the best promising technologies.
Mitochondrial Lysyl-tRNA Synthetase Independent Import of tRNA Lysine into Yeast Mitochondria
Naresh Babu V. Sepuri, Madhavi Gorla, Michael P. King
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0035321
Abstract: Aminoacyl tRNA synthetases play a central role in protein synthesis by charging tRNAs with amino acids. Yeast mitochondrial lysyl tRNA synthetase (Msk1), in addition to the aminoacylation of mitochondrial tRNA, also functions as a chaperone to facilitate the import of cytosolic lysyl tRNA. In this report, we show that human mitochondrial Kars (lysyl tRNA synthetase) can complement the growth defect associated with the loss of yeast Msk1 and can additionally facilitate the in vitro import of tRNA into mitochondria. Surprisingly, the import of lysyl tRNA can occur independent of Msk1 in vivo. This suggests that an alternative mechanism is present for the import of lysyl tRNA in yeast.
Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky, Miryam P.;Bar, María E.;Gorla, David;
Revista da Sociedade Brasileira de Medicina Tropical , 2005, DOI: 10.1590/S0037-86822005000500014
Abstract: the aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of triatoma rubrovaria. four cohorts with 60 recently laid eggs each were conformed. the cohorts were divided into two groups. in the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. in group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
Life cycle and reproductive patterns of Triatoma rubrovaria (Blanchard, 1843) (Hemiptera: Reduviidae) under constant and fluctuating conditions of temperature and humidity
Damborsky Miryam P.,Bar María E.,Gorla David
Revista da Sociedade Brasileira de Medicina Tropical , 2005,
Abstract: The aim of this study was to evaluate the temperature and relative humidity influence in the life cycle, mortality and fecundity patterns of Triatoma rubrovaria. Four cohorts with 60 recently laid eggs each were conformed. The cohorts were divided into two groups. In the controlled conditions group insects were maintained in a dark climatic chamber under constant temperature and humidity, whereas triatomines of the ambiental temperature group were maintained at room temperature. Average incubation time was 15.6 days in the controlled conditions group and 19.1 days in the ambiental temperature. In group controlled conditions the time from egg to adult development lasted 10 months while group ambiental temperature took four months longer. Egg eclosion rate was 99.1% and 98.3% in controlled conditions and ambiental temperature, respectively. Total nymphal mortality in controlled conditions was 52.6% whereas in ambiental temperature was 51.8%. Mean number of eggs/female was 817.6 controlled conditions and 837.1 ambiental temperature. Fluctuating temperature and humidity promoted changes in the life cycle duration and in the reproductive performance of this species, although not in the species mortality.
Mixed ladder determinantal varieties from two-sided ladders
Elisa Gorla
Mathematics , 2005,
Abstract: We study the family of ideals defined by mixed size minors of two-sided ladders of indeterminates. We compute their Groebner bases with respect to a skew-diagonal monomial order, then we use them to compute the height of the ideals. We show that these ideals correspond to a family of irreducible projective varieties, that we call mixed ladder determinantal varieties. We show that these varieties are arithmetically Cohen-Macaulay. We characterize the arithmetically Gorenstein ones, among those that satisfy a technical condition. Our main result consists in proving that mixed ladder determinantal varieties belong to the same G-biliaison class of a linear variety.
A generalized Gaeta's Theorem
Elisa Gorla
Mathematics , 2007, DOI: 10.1112/S0010437X07003375
Abstract: We generalize Gaeta's Theorem to the family of determinantal schemes. In other words, we show that the schemes defined by minors of a fixed size of a matrix with polynomial entries belong to the same G-biliaison class of a complete intersection whenever they have maximal possible codimension, given the size of the matrix and of the minors that define them.
Symmetric ladders and G-biliaison
Elisa Gorla
Mathematics , 2008,
Abstract: We study the family of ideals generated by minors of mixed size contained in a ladder of a symmetric matrix from the point of view of liaison theory. We prove that they can be obtained from ideals of linear forms by ascending G-biliaison. In particular, they are glicci.
The general hyperplane section of a curve
E. Gorla
Mathematics , 2003,
Abstract: In this paper, we discuss some necessary and sufficient condition for a curve to be arithmetically Cohen-Macaulay, in terms of its general hyperplane section. We obtain a characterization of the degree matrices that can occur for points in the plane that are the general hyperplane section of a non arithmetically Cohen-Macaulay curve of P^3. We prove that almost all the degree matrices with positive subdiagonal that occur for the general plane section of a non arithmetically Cohen-Macaulay curve of P^3, arise also as degree matrices of the general plane section of some smooth, integral, non arithmetically Cohen-Macaulay curve, and we characterize the exceptions. We give a necessary condition on the graded Betti numbers of the general hyperplane section of an arithmetically Buchsbaum, (non arithmetically Cohen-Macaulay) curve in P^n. For curves in P^3, we show that any set of Betti numbers that satisfies that condition, can be realised as the Betti numbers of the general plane section of an arithmetically Buchsbaum, non arithmetically Cohen-Macaulay curve. We also show that the matrices that arise as degree matrix of the general plane section of an arithmetically Buchsbaum, integral, (smooth) non arithmetically Cohen-Macaulay space curve are exactly those that arise as degree matrix of the general plane section of an arithmetically Buchsbaum, non arithmetically Cohen-Macaulay space curve and have positive subdiagonal. We also prove some bounds on the dimension of the deficiency module of an arithmetically Buchsbaum space curve, in terms of the degree matrix of the general plane section of the curve.
The G-biliaison class of symmetric determinantal schemes
Elisa Gorla
Mathematics , 2005,
Abstract: We consider a family of schemes, that are defined by minors of a homogeneous symmetric matrix with polynomial entries. We assume that they have maximal possible codimension, given the size of the matrix and of the minors that define them. We show that these schemes are G-bilinked to a linear variety of the same dimension. In particular, they can be obtained from a linear variety by a finite sequence of ascending G-biliaisons on some determinantal schemes. In particular, it follows that these schemes are glicci. We describe the biliaisons explicitely in the proof of the main theorem.
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