429 research outputs found
The effect of a trapping procedure on the stress response of wild rainbow trout
No full textFish traps are a common research and management tool in which fish are subjected to procedures that elicit a stress response in other contexts. The effects of trapping on the stress response of sexually mature, wild rainbow trout Oncorhynchus mykiss were investigated during their upstream spawning migration by measuring concentrations of plasma cortisol, lactate, and glucose. Males had significantly lower basal plasma cortisol concentrations (6.1 ± 0.8 ng/mL [mean ± SE]) than females (21.4 ± 5.9 ng/mL). Similarly, the plasma cortisol response in males was significantly lower than that in females for all experiments. Fish working the barrier before entering the trap had increased concentrations of plasma cortisol. Confinement in the trap also induced a stress response. Plasma cortisol concentrations increased to 185.1 ± 40.9 ng/mL in males and 549.1 ± 60.1 ng/mL in females after confinement for 1 h. After processing, the magnitude of the stress response and the relative duration of recovery was less in fish that were confined longer in the trap. However, resting cortisol concentrations in females were not reached after 40 h of recovery in either group. Recovery to resting concentrations of plasma lactate occurred within 15 h after processing. In contrast, concentrations of plasma glucose remained significantly elevated at 40 h after processing. Postspawning fish had significantly lower plasma concentrations of cortisol, glucose, and lactate following application of an extreme stressor compared with prespawning fish. Based on the results of this study, we conclude that the trapping procedure induces a severe and prolonged stress response in wild rainbow trout
"Dimensions of Water Security in Bulgaria. Synthesis of the Working group 2 of 11th European Seminar on the Geography of Water", 11th Erasmus IP "Water Security Problems in Bulgaria", Sofia, 29th June - 10 July 2008
No full textArithmetic of positive characteristic L-series values in Tate algebras
No full textfinal versionInternational audienceThe second author has recently introduced a new class of L-series in the arithmetic theory of function fields over finite fields. We show that the value at one of these L-series encode arithmetic informations of certain Drinfeld modules defined over Tate algebras. This enables us to generalize Anderson's log-algebraicity Theorem and Taelman's Herbrand-Ribet Theorem
Arithmetic of positive characteristic -series values in Tate algebras
No full textThe second author has recently introduced a new class of-series in the arithmetic theory of function fields over finite fields. We show that the values at one of these-series encode arithmetic information of a generalization of Drinfeld modules defined over Tate algebras that we introduce (the coefficients can be chosen in a Tate algebra). This enables us to generalize Anderson’s log-algebraicity theorem and an analogue of the Herbrand–Ribet theorem recently obtained by Taelman
Poetry Winners, Dalby, Tate, and Geuder
No full text(l. to r.) Lyle Tate, coordinator of the 2007 Cotton District Literary Festival; Sanitra Lawrence, second-place Poetry Competition winner; Robert Dalby, special guest speaker and Oxford, MS, author; Jonte Bouchard, first-place Poetry Competition winner; Cimmeion Patty, third-place Poetry Competition winner; and Maridith Geuder, director of MSU Media Relations pose for a photograph after the Literary Festival in the John Grisham Room
On central -values and the growth of the -part of the Tate-Shafarevich group
No full textGiven any cube-free integer , we study the -adic valuation of
the algebraic part of the central -value of the elliptic curve
We give a lower bound in terms of the number of
distinct prime factors of , which, in the case divides ,
also depends on the power of in . This extends an earlier result
of the author in which it was assumed that is coprime to . We also
study the -part of the Tate-Shafarevich group for these curves and show that
the lower bound is as expected from the conjecture of Birch and
Swinnerton-Dyer, taking into account also the growth of the Tate-Shafarevich
group.Comment: 16 pages, published versio
On central -values and the growth of the -part of the Tate-Shafarevich group
No full textGiven any cube-free integer , we study the -adic valuation of the algebraic part of the central -value of the elliptic curve We give a lower bound in terms of the number of distinct prime factors of , which, in the case divides , also depends on the power of in . This extends an earlier result of the author in which it was assumed that is coprime to . We also study the -part of the Tate-Shafarevich group for these curves and show that the lower bound is as expected from the conjecture of Birch and Swinnerton-Dyer, taking into account also the growth of the Tate-Shafarevich group
ON THE CONJECTURES OF BEILINSON-TATE FOR SIEGEL SIXFOLDS (Algebraic Number Theory and Related Topics)
No full textThese are the (extended) notes of a talk given by the author at the conference Algebraic Number Theory and Related Topics 2023, held at the Research Institute for Mathematical Sciences, Kyoto University. The author thanks the organizers Masataka Chida, Yoichi Mieda, and Wataru Kai for the wonderful opportunity to speak there. In this survey, we discuss our recent works [BGCLRJ23], [CLJ22] on the Beilinson-Tate conjectures for the Siegel sixfold and the description of Deligne-Beilinson cohomology in terms of tempered currents.1. Automorphic L-functions [1]2. Beilinson-Tate conjectures and main result [6]3. Elements of the proofs and crucial technical innovation [11]References [16
Pharmaceuticals in the aquatic environment: β-blockers as a case study
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University, 20/09/2008.The presence of many human pharmaceuticals in the aquatic environment is now a worldwide concern and yet little is known of the chronic effects that these bioactive substances may be having on aquatic organisms. This study used mammalian pharmacodynamics to predict the mode of action of the 13-blocker, propranolol, on fish, in order to identify chronic effects in fathead minnows. β-blockers target β1- and β2-adrenergic receptors in humans and hence these receptors were characterised in the fathead minnow. It was found that fish possess β1- and β2-ARs that are structurally very similar to their mammalian counterparts. Further, the distributions of these two β-ARs in various organs of the fathead minnow were similar to those in mammals. Pair-breeding assays were conducted, in which fathead minnows were exposed to various concentrations of propranolol. To discover whether β-ARs had been up or down regulated by propranolol, molecular analysis was conducted on different tissues of the exposed fish using real-time polymerase-chain reactions (RT-PCR). Exposure of fathead minnows to propranolol caused acute toxicity at 10 mg/L. Propranolol caused a statistically significant decrease in reproduction at 1.0 mg/L, dose-related decreases in male weight, condition index and fatpad weight, and a dose-related increase in female GSI. Molecular analysis of βl- and β2-AR expression levels revealed a dose-related decrease in β2-AR expression in fathead liver and heart. LOEC and NOEC values were 0.1 mg/L and 0.01 mg/L, respectively. Propranolol plasma concentrations in fish exposed to water concentrations of 0.1 and 1.0 mg/L were greater than the human therapeutic concentration and hence these data very strongly support the fish plasma model proposed by Huggett et al. (2001).European Union (as part of the ERAPharm consortium
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A Study of the Effect of Teacher - Pupil Ratio upon the Child's Achievement
No full textThis study examines the impact that classroom size makes on the development of secondary students. To gather data, the author focused on Leverett's Chapel School near Kilgore, Texas
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