In the present paper we study a tri-trophic Lotka-Volterra food web model with omnivory and predator switching. We observe that if the intensity of predator switching increases the chaotic behavior of the omnivory model will be reduced. We conclude that the predator switching mechanism enhances the stability of an otherwise chaotic system.

1. Conversion of thyroxine into tri-iodothyronine and reverse tri-iodothyronine in intact cells was studied with isolated renal tubules prepared by collagenase digestion. 2. Conversion of thyroxine into tri-iodothyronine and reverse tri-iodothyronine increased progressively for at least 90 min. 3. Studies of tri-iodothyronine production from increasing amounts of thyroxine revealed that the thy...

Electrochemiluminescence (ECL) of a boron-dipyrromethene dye (BDY) in the presence of tri-n-propylamine as a co-reactant was found to be efficient. The ECL of BDY showed a unique peak wavelength of 707 nm, indicative of the intermolecular electronic transition mechanism.

Electrochemiluminescence (ECL) of a boron difluoride formazanate dye was investigated in the presence of tri-n-propylamine as a reductive co-reactant. The ECL mechanism was studied using ECL-voltage curves, spooling ECL, and accumulative ECL spectroscopy. The ECL occurs at 724 nm by three distinct, voltage-dependent mechanisms of light emission.

The relation between the second law of thermodynamics and the notion of irreversibility is analysed by distinguishing three different meanings of the latter and studying how they figure in several versions of the second law. A more extensive discussion is given in [1]. 1. THREE CONCEPTS OF (IR)REVERSIBILITY Many physical theories employ a state space Γ containing all possible states s of a syst...

Introduction: Acute pulmonary embolism (PE) is one of the deadly cardiovascular diseases. One of the indexes proposed in these patients for risk stratification is the Thrombolysis in Myocardial Infarction (TIMI) risk index (TRI), which includes three parameters of systolic blood pressure, age, and heart rate. This study aimed to evaluate the predictive value of TRI on in-hospit...

In this paper, we present a tri-band filter design using tri-mode T-shaped branches connected by λ/4 transmission lines. By analyzing the input admittance of a T-shape branch with commensurate electrical lengths, three resonant modes with two transmission zeros between are found and design formulas are derived. The filter can be regarded as a combination of three bandpass filters with only one ...

This paper proposes a syllable context dependent model for spontaneous speech recognition. It is generally assumed that, since spontaneous speech is greatly affected by coarticulation, an acoustic model featuring a longer range phonemic context is required to achieve a high degree of recognition accuracy. This motivated the authors to investigate a tri-syllable model that takes differences in t...

The aim of the present study was to investigate whether and by which mechanism; histamine can induce state-dependent retrieval of passive avoidance task. The pre-training or pre-test intracerebroventricular (i.c.v.) injection of histamine (20µg/mouse) impaired retrieval, when it was tested 24 h later. In the animals, which retrieval was impaired due to histamine pre-training administration, pre...