نتایج جستجو برای: threshold concentration

تعداد نتایج: 496804  

Journal: :I. J. Bifurcation and Chaos 2010
Charlotte Yuk-Fan Ho Bingo Wing-Kuen Ling

In this paper, we numerically show that the dynamics of the HIV system is sensitive to both the initial condition and the system parameters. These phenomena imply that the system is chaotic and exhibits a bifurcation behavior. To control the system, we propose to initiate an HIV therapy based on both the concentration of the HIV-1 viral load and the ratio of the CD4 lymphocyte population to the...

Journal: :Biophysical journal 2003
Yoram Burak Gil Ariel David Andelman

We address theoretically aggregation of DNA segments by multivalent polyamines such as spermine and spermidine. In experiments, the aggregation occurs above a certain threshold concentration of multivalent ions. We demonstrate that the dependence of this threshold on the concentration of DNA has a simple form. When the DNA concentration c(DNA) is smaller than the monovalent salt concentration, ...

صفارپور, سپیده, نصیری‌نژاد, فریناز,

    Background and Aim: Ascorbate (ascorbic acid) is present in high concentration in the nervous system and is released as a result of activation of glutaminergic neurons. Due to high concentration of NMDA receptors in the nervous system, this study investigated the analgesic efficacy of ascorbic acid (AA) in neuropathic pain condition and the role of NMDA receptors in this effect.Materials an...

Journal: :Journal of microbiology and biotechnology 2008
Jongseol Kim Robert C Frohnhoefer Young-Cheol Cho Du Wan Cho G-Yull Rhee

We investigated whether the threshold concentration for polychlorinated biphenyl (PCB) dechlorination may be lower in biosurfactant-amended sediments compared with biosurfactant-free samples. At PCB concentrations of 40, 60, and 120 ppm, the surfactant amendment enhanced the PCB dechlorination rate at all concentrations and the rate was also faster at higher concentrations. On a congener group ...

Journal: :Clinical chemistry 2001
A Kondo Y Muranaka I Ohta K Notsu M Manabe K Kotani K Saito M Maekawa T Kanno

BACKGROUND Hypertriglyceridemia is associated with decreased HDL-cholesterol (HDL-C) and increased small dense LDL. In addition, small dense LDL is known to be susceptible to oxidation. METHODS We measured LDL particle size, using gradient gel electrophoresis, and malondialdehyde-modified LDL (MDA-LDL), using an ELISA, and investigated the association between triglyceride (TG) concentrations,...

Journal: :International journal of biometeorology 2011
László Makra István Matyasovszky Michel Thibaudon Maira Bonini

Nonparametric time-varying regression methods were developed to forecast daily ragweed pollen concentration, and the probability of the exceedance of a given concentration threshold 1 day ahead. Five-day and 10-day predictions of the start and end of the pollen season were also addressed with a nonparametric regression technique combining regression analysis with the method of temperature sum. ...

Journal: :iranian journal of public health 0
m. ghasemkhani

in this research, air sampling of workplaces was carried out by two methods (long - time and short - time). the mean formaldehyde concentration with long - time method in pathology labs, surgery and endoscopy sections were 0.96 0.25 and 0.13 ppm and with short - time method, 8 hours, was 3, 0.3 and 0.2 ppm. the mean formaldehyde concentration in pathology labs was above the standard values (tlv...

Journal: :Applied and environmental microbiology 1989
H Min S H Zinder

The kinetics of acetate utilization were examined for washed concentrated cell suspensions of two thermophilic acetotrophic methanogens isolated from a 58 degrees C anaerobic digestor. Progress curves for acetate utilization by cells of Methanosarcina sp. strain CALS-1 showed that the utilization rate was concentration independent (zero order) above concentrations near 3 mM and that acetate uti...

Journal: :Virology 2005
Jaisri R Lingappa Michael A Newman Kevin C Klein Julia E Dooher

Many viruses that assemble their capsids in the eukaryotic cytoplasm require a threshold concentration of capsid protein to achieve capsid assembly. Strategies for achieving this include maintaining high levels of capsid protein synthesis and targeting to specific sites to raise the effective concentration of capsid polypeptides. To understand how different viruses achieve the threshold capsid ...

Journal: :The Journal of general virology 2004
Vitantonio Pantaleo Luisa Rubino Marcello Russo

The p36 and p95 proteins of Carnation Italian ringspot virus (CIRV), when expressed in Saccharomyces cerevisiae, supported the replication of defective interfering (DI) RNA. Double-label confocal immunofluorescence showed that both proteins localized to mitochondria, independently of each other. DI RNA progeny was localized by in situ hybridization both to mitochondria and to their proximity. F...

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