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Domingo Cruz-Labana José,Antonio Tarango-Arámbula Luis,Luis Alcántara-Carbajal José,Delgado-Alvarado Adriana,Magdalena Crosby-Galván María,Manuel Ruiz-Vera Víctor 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1
Ants are among the organisms that are considered habitat engineers due to their ability to induce changes in the soil. An economically significant ant species is Liometopum apiculatum MAYR, 1870, as its pupae are utilized for human consumption. This ant has been extensively studied using various biological and ecological approaches in diverse habitats across North America. However, there is limited research documenting the properties of the soil in which they nest. The objective of this research was to analyze the physical and chemical properties of soil from Liometopum apiculatum nests and random sites, and to explain how ants can modify the soil in a semi-arid area of north-central Mexico. A sample size of 45 nests distributed in scrub vegetation was determined. Soil samples (2.5 kg) were collected from nests and random sites (20 m in a random direction) at a depth of 20 cm, and aggregates of 3 to 4 cm in length were included during the excavations. The physical variables evaluated were moisture, texture, bulk density and mechanical penetration resistance (MPR); while the chemical ones were pH, electrical conductivity, organic matter, nitrogen, phosphorus and potassium. The variables moisture (p = 0.031), bulk density (p < 0.01), MPR (p = 0.0289); pH (p < 0.001), electrical conductivity (p < 0.01) and organic matter (p < 0.01) had statistical differences between soil from nests and random sites. This research adds to the existing body of knowledge on Liometopum apiculatum by presenting information on the physical and chemical properties of the soil in which they establish their nests.
Recent Advances in Filter Topologies and Realizations for Satellite Communications
Fahmi, Mohamed M.,Ruiz-Cruz, Jorge A.,Mansour, Rafaat R.,Zaki, Kawthar A. The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.6
This paper presents an overview of recent advances in radio frequency and microwave filter topologies for satellite communication systems. Many types of filters have been developed during the last years in order to satisfy the demands of modern applications in both terrestrial systems and onboard spacecrafts, leading to a great variety of aspects such as transfer functions, resonator implementations or coupling structures. This paper revisits some of the last advances in this area, including the modeling and full-wave simulation. Some recent designs using dual-mode cavities along with other novel implementations in ridge waveguide will be shown.
Recent Advances in Filter Topologies and Realizations for Satellite Communications
Mohamed M. Fahmi,Jorge A. Ruiz-Cruz,Rafaat R. Mansour,Kawthar A. Zaki 한국통신학회 2011 Journal of communications and networks Vol.13 No.6
This paper presents an overview of recent advances in radio frequency and microwave filter topologies for satellite communication systems. Many types of filters have been developed during the last years in order to satisfy the demands of modern applications in both terrestrial systems and onboard spacecrafts, leading to a great variety of aspects such as transfer functions, resonator implementations or coupling structures. This paper revisits some of the last advances in this area, including the modeling and full-wave simulation. Some recent designs using dual-mode cavities along with other novel implementations in ridge waveguide will be shown.
Jorge Antonio Zamora Dominguez,Irma Olarte Carrillo,Rubén Ruiz Ramos,Christian Omar Ramos-Peñafiel,Luis Jiménez Zamudio,Ethel García Latorre,Federico Centeno Cruz,Adolfo Martínez Tovar 대한혈액학회 2023 Blood Research Vol.58 No.1
Background Leukemia is a neoplasm with high incidence and mortality rates. Mitotic death has been observed in tumor cells treated with chemotherapeutic agents. Ras family proteins participate in the transduction of signals involved in different processes, such as proliferation, differentiation, survival, and paradoxically, initiation of cell death. Methods This study investigated the effect of H-Ras expression on human T-cell acute lymphoblastic leukemia MOLT-4 cells. Cells were electroporated with either wild-type (Raswt) or oncogenic mutant in codon 12 exon 1 (Rasmut) versions of H-Ras gene and stained for morphological analysis. Cell viability was assessed using trypan blue staining and cell cycle analysis using flow cytometry. H-Ras gene expression was determined using quantitative real-time reverse transcription polymerase chain reaction. The t, ANOVA, and Scheffe tests were used for statistical analysis. Results Human T-cell acute lymphoblastic leukemia MOLT-4 cells showed nuclear fragmentation and presence of multiple nuclei and micronuclei after transfection with either wt or mutant H-Ras genes. Cell cycle analysis revealed a statistically significant increase in cells in the S phase when transfected with either wt (83.67%, P <0.0005) or mutated (81.79%, P <0.0001) H-Ras genes. Although similar effects for both versions of H-Ras were found, cells transfected with the mutated version died at 120 h of mitotic catastrophe. Conclusion Transfection of human T-cell acute lymphoblastic leukemia MOLT-4 cells with either normal or mutated H-Ras genes induced alterations in morphology, arrest in the S phase, and death by mitotic catastrophe.
Pinning Control of Complex Network Synchronization: A Recurrent Neural Network Approach
Edgar N. Sanchez,David I. Rodriguez-Castellanos,Guanrong Chen,Riemann Ruiz-Cruz 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
Using recurrent high order neural networks for identification, a new scheme for pinning control of complexnetworks with changing unknown coupling strengths is proposed for achieving synchronization. The robustbehavior of the control system is investigated via simulations.
Proteolytic System of Streptococcus thermophilus
( G. M. Rodriguez-serrano ),( M. Garcia-garibay ),( A. E. Cruz-guerrero ),( L. Gomez-ruiz ),( A. Ayala-nino ),( A. Castaneda-ovando ),( L. G. Gonzalez-olivares ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.10
The growth of lactic acid bacteria (LAB) generates a high number of metabolites related to aromas and flavors in fermented dairy foods. These microbial proteases are involved in protein hydrolysis that produces necessary peptides for their growth and releases different molecules of interest, like bioactive peptides, during their activity. Each genus in particular has its own proteolytic system to hydrolyze the necessary proteins to meet its requirements. This review aims to highlight the differences between the proteolytic systems of Streptococcus thermophilus and other lactic acid bacteria (Lactococcus and Lactobacillus) since they are microorganisms that are frequently used in combination with other LAB in the elaboration of fermented dairy products. Based on genetic studies and in vitro and in vivo tests, the proteolytic system of Streptococcus thermophilus has been divided into three parts: 1) a serine proteinase linked to the cellular wall that is activated in the absence of glutamine and methionine; 2) the transport of peptides and oligopeptides, which are integrated in both the Dpp system and the Ami system, respectively; according to this, it is worth mentioning that the Ami system is able to transport peptides with up to 23 amino acids while the Opp system of Lactococcus or Lactobacillus transports chains with less than 13 amino acids; and finally, 3) peptide hydrolysis by intracellular peptidases, including a group of three exclusive of S. thermophilus capable of releasing either aromatic amino acids or peptides with aromatic amino acids.
( Norma Patricia Silva-beltran ),( Cristobal Chaidez-quiroz ),( Osvaldo Lopez-cuevas ),( Saul Ruiz-cruz ),( Marco A. Lopez-mata ),( Carmen Lizette Del-toro-sanchez ),( Enrique Marquez-rios ),( Jose De 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.2
Potato peels (PP) contain several bioactive compounds. These compounds are known to provide human health benefits, including antioxidant and antimicrobial properties. In addition, these compounds could have effects on human enteric viruses that have not yet been reported. The objective of the present study was to evaluate the phenolic composition, antioxidant properties in the acidified ethanol extract (AEE) and water extract of PP, and the antiviral effects on the inhibition of Av-05 and MS2 bacteriophages, which were used as human enteric viral surrogates. The AEE showed the highest phenolic content and antioxidant activity. Chlorogenic and caffeic acids were the major phenolic acids. In vitro analysis indicated that PP had a strong antioxidant activity. A 3 h incubation with AEE at a concentration of 5 mg/ml was needed to reduce the PFU/ml (plaque-forming unit per unit volume) of Av-05 and MS2 by 2.8 and 3.9 log10, respectively, in a dose-dependent manner. Our data suggest that PP has potential to be a source of natural antioxidants against enteric viruses.