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17 results on '"Hjorth G"'

1. Orbit cardinalities

Author

Hjorth, G.

Subjects
Mathematics - Logic
Abstract

This paper considers "definable cardinalities" arising from Polish group actions. The first part of the paper answers a question of Becker-Kechris by showing that under suitable determinacy assumptions in ZF+DC, every action by a Polish group on a metric space is either as complicated as the Vitali equivalence relation or no more complicated than the equality relation on bounded subsets of \aleph_1. The same argument shows that if hereditarily wellorderabel sets can be used as complete invariants, then elements in HC will do. The second half gives a new proof of Howard Becker's recent theorem that Vaught's conjecture holds for groups with a left invariant complete metric. The proof also serves to show that Vaught's conjecture holds for such groups on \Sigma^1_1 sets (in ZFC) and "reasonably definable" sets under large cardinal assumptions.

Published
1996

3. The complexity of the classification of Riemann surfaces and complex manifolds

Author

Hjorth, G. and Kechris, A. S.

Subjects
Mathematics::Logic, 03E15, 30F20, 32Q99
Abstract

In answer to a question by Becker, Rubel, and Henson, we show that countable subsets of $\mathbb{C}$ can be used as complete invariants for Riemann surfaces considered up to conformal equivalence, and that this equivalence relation is itself Borel in a natural Borel structure on the space of all such surfaces. We further proceed to precisely calculate the classification difficulty of this equivalence relation in terms of the modem theory of Borel equivalence relations. ¶ On the other hand we show that the analog of Becker, Rubel, and Henson's question has a negative solution in (complex) dimension $n \geq 2$.

Published
2000

6. A converse to Dye's theorem

Author

Hjorth, G and Hjorth, G

Abstract

Every non-amenable countable group induces orbit inequivalent ergodic equivalence relations on standard Borel probability spaces. Not every free, ergodic, measure preserving action of F 2 \mathbb {F}_2 on a standard Borel probability space is orbit equivalent to an action of a countable group on an inverse limit of finite spaces. There is a treeable non-hyperfinite Borel equivalence relation which is not universal for treeable in the ≤ B \leq _B ordering.

Published
2005

14. [Wedding and anthrax].

Author

Hjorth G

Subjects
Animals, Bacillus anthracis isolation & purification, Cattle, Disease Outbreaks, Food Microbiology, Humans, Meat microbiology, Tanzania, Anthrax transmission
Published
2006

15. Inverse relationship between protein intake and plasma free amino acids in healthy men at physical exercise.

Author

Forslund AH, Hambraeus L, van Beurden H, Holmbäck U, El-Khoury AE, Hjorth G, Olsson R, Stridsberg M, Wide L, Akerfeldt T, Regan M, and Young VR

Subjects
Adult, Circadian Rhythm, Energy Metabolism, Fasting, Food, Glucagon blood, Humans, Insulin blood, Kidney metabolism, Male, Amino Acids blood, Dietary Proteins administration & dosage, Exercise physiology
Abstract

The effect of a "normal" (n = 8) and "high" (n = 6) protein intake (1 and 2.5 g x kg(-1) x day(-1), respectively) and of exercise on plasma amino acid (AA) concentrations, insulin, and glucagon concentrations was followed throughout a continuous 24-h period in adult male subjects at energy balance after six days on a standardized diet and exercise program. Subjects were fasting from 2100 on day 6 to 1200 on day 7 and then fed 10 identical meals hourly until 2100. Physical exercise was performed (46% maximal oxygen uptake) between 0830 and 1000 (fasting) and in a fed state (1600-1730) on each day. The normal-protein group showed fasting plasma AA concentrations that were higher (P < 0.05) than those for the high-protein group, except for leucine, methionine, and tyrosine. Glutamine, glycine, alanine, taurine, and threonine concentrations were distinctly higher ( approximately 30% or greater) throughout the 24-h period in subjects consuming the normal- vs. the high-protein diets. Exercise appeared to increase, although not profoundly, the plasma concentrations of amino acids except for glutamate, histidine, ornithine, and tryptophan. The profound diet-related differences in plasma AA concentrations are only partially explained by differences in the renal clearance of the amino acids. We speculate on the possible metabolic basis for these findings.

Published
2000
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16. Argininosuccinic aciduria. Report of three cases and the effect of high and reduced protein intake on the clinical state.

Author

Hambraeus L, Hardell LI, Westphal O, Lorentsson R, and Hjorth G

Subjects
Amino Acid Metabolism, Inborn Errors complications, Amino Acid Metabolism, Inborn Errors therapy, Amino Acids blood, Amino Acids cerebrospinal fluid, Amino Acids urine, Ammonia blood, Arginine urine, Blood Urea Nitrogen, Cerebellar Ataxia etiology, Child, Developmental Disabilities etiology, Diet Therapy, Electroencephalography, Female, Hair, Humans, Intellectual Disability etiology, Succinates urine, Amino Acid Metabolism, Inborn Errors urine, Arginine metabolism, Dietary Proteins, Succinates metabolism
Published
1974
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17. Parenteral nutrition with a solution of pure L-amino acids.

Author

Abrahamsson L, Hakelius L, Hambraeus L, Ohlin SE, and Hjorth G

Subjects
Adult, Alanine pharmacology, Amino Acids urine, Arginine pharmacology, Blood Urea Nitrogen, Creatinine blood, Glycine pharmacology, Histidine pharmacology, Humans, Male, Proline pharmacology, Solutions, Amino Acids pharmacology, Nitrogen metabolism, Parenteral Nutrition
Published
1972

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