Tuấn Đỗ

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Boris Shraiman

Claudius Gros

Goethe-Universität Frankfurt am Main

University of Tehran

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Stress-Induced Mutagenesis Can Further Boost Population Success in Static Ecology

arXiv (Cornell University), Mar 16, 2023

We have developed a mathematical model that captures stress-induced mutagenesis, a fundamental as... more We have developed a mathematical model that captures stress-induced mutagenesis, a fundamental aspect of pathogenic and neoplastic evolutionary dynamics, on the fitness landscape with multiple relevant genetic traits as a D-dimensional Euclidean space. In this framework, stressinduced mutagenesis manifests as a heterogeneous diffusion process. We show how increasing mutations, and thus reducing exploitation, in a static ecology with fixed carrying capacity and maximum growth rates, can paradoxically boost population size. Remarkably, this unexpected biophysical phenomenon applies universally to any number of traits D = 1, 2, 3, ...

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Stability investigations of isotropic and anisotropic exponential inflation in the Starobinsky-Bel-Robinson gravity

arXiv (Cornell University), Mar 30, 2023

In this paper, we would like to examine whether a novel Starobinsky-Bel-Robinson gravity model ad... more In this paper, we would like to examine whether a novel Starobinsky-Bel-Robinson gravity model admits stable exponential inflationary solutions with or without spatial anisotropies. As a result, we are able to derive an exact de Sitter inflationary to this Starobinsky-Bel-Robinson model. Furthermore, we observe that an exact Bianchi type I inflationary solution does not exist in the Starobinsky-Bel-Robinson model. However, we find that a modified Starobinsky-Bel-Robinson model, in which the sign of coefficient of R 2 term is flipped from positive to negative, can admit the corresponding Bianchi type I inflationary solution. Unfortunately, stability analysis using the dynamical system approach indicates that both of these inflationary solutions turn out to be unstable. Interestingly, we show that a stable de Sitter inflationary solution can be obtained in the modified Starobinsky-Bel-Robinson gravity.

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Prevalence of group B streptococcus colonisation and pregnancy outcomes of pregnant women at Hanoi Obstetrics and Gynecology Hospital

Ministry of Science and Technology, Vietnam

Objectives: To determine the prevalence of maternal group B streptococcus (GBS) colonisation and ... more Objectives: To determine the prevalence of maternal group B streptococcus (GBS) colonisation and pregnancy results of pregnant women at Hanoi Obstetrics and Gynecology Hospital. Materials and methods: Retrospective descriptive with 537 pregnant women delivered at the Hanoi Obstetrics and Gynecology Hospital in 2021, GBS was detected based on culture, isolation, and identification of bacteria from the vagina-rectum samples at 36-37+6 weeks gestation. Results: The prevalence of maternal GBS colonisation was 18.1%. 87.5% of GBS colonisations were applied to intrapartum antibiotic prophylaxis during labour or ruptured membranes. Diabetes increased the risk of carrying GBS (OR=2.3, 95%CI: 1.17-4.34). Maternal GBS colonisation increased the risk of rupture of membranes (OR 3.09, 95%CI: 1.95-4.85) and antibiotic treatment of newborns (OR=3.39, 95%CI: 1.05-10.92). However, there was no increased risk for cesarean section or postpartum infection (p>0.05). Maternal GBS colonisation with in...

Arsenic removal by iron oxide coated sponge: treatment and waste management

Water Science and Technology, 2009

One of the problems in drinking water that raises concern over the world is that millions of peop... more One of the problems in drinking water that raises concern over the world is that millions of people still have to use arsenic-contaminated water. There is a worldwide need to develop appropriate technologies to remove arsenic from water for household and community water supply systems. In this study, a new material namely iron oxide coated sponge (IOCSp) was developed and used to remove arsenic (As) from contaminated groundwater in Vietnam. The results indicated that IOCSp has a high capacity in removing both As (V) and As (III). The adsorption capacity of IOCSp was up to 4.6 mg As/g IOCSp, showing better than many other materials. It was observed from a pilot study that a small quantity of IOCSp (180 g) could reduce As concentration of 480 μg/L in 1.5 m3 of contaminated natural water to below 40 μg/L. In addition, an exhausted IOCSp, containing a large amount of arsenic (up to 0.42 wt %) could safely be disposed through the solidification/stabilization with cement. Addition of fly ...

Stress-Induced Mutagenesis Can Further Boost Population Success in Static Ecology

arXiv (Cornell University), Mar 16, 2023

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Stability investigations of isotropic and anisotropic exponential inflation in the Starobinsky-Bel-Robinson gravity

arXiv (Cornell University), Mar 30, 2023

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Prevalence of group B streptococcus colonisation and pregnancy outcomes of pregnant women at Hanoi Obstetrics and Gynecology Hospital

Ministry of Science and Technology, Vietnam

Arsenic removal by iron oxide coated sponge: treatment and waste management

Water Science and Technology, 2009

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