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Eslava, Carlos,Sainz, Teresita,Perez, Julia,Fresan, Ma.Cristina,Flores, Veronica,Jimenez, Luis,Hernandez, Ulises,Herrera, Ismael The Microbiological Society of Korea 2002 The journal of microbiology Vol.40 No.2
Enteroaggregative E. coil (EAEC) is an important aethiological causal agent of diarrhea in people of developed and undeveloped countries. Different in vitro and in vivo models have been proposed to study the pathdgenic and immune mechanisms of EAEC infaction. The aim of this study was to analyze whether BALB/c mice could be used as an animal model to study EAEC pathogenesis Six-week-old BALB/c mice were inoculated with EAEC strain 042 (044:H88) nalidixic acid resistant, and re-inoc-ulated ten days after. Mice feces were monitored for the presence of the EAEC strain over a period of 20 days . Bacteria were enumerated on MacConkey agar containing 100$\mu$g of nalidixic acid per ml. Results showed that 35% of the animals were colonized for 3 days, 15% for 5 and 10% for more than 7 days . After re-inoculation only 16% of the animals remained colonized for more than 3 days. During the necropsy, the intestinal fluid of same of the infected animals presented mucus and blood. Six of these fluids showed the presence of IgA antibodies againset Pet toxin and IgG natibodies raised against the toxin were also detected in the animal serum. Histopathologic evidence confirms the stimulation of mucus hypersecretion, an increased amount of goblet cells and the presence of bacterial aggregates in the apical surfaces of intestinal epithelial cells. Edema was present in the submucosa. These results suggest that BALB/c mice could be used as an animal model for in vivo study of EAEC infection.
Yazmín Hernández‑Díaz,Thelma Beatriz González‑Castro,Isela Esther Juárez‑Rojop,Carlos Alfonso Tovilla‑Zárate,María Lilia López‑Narváez,Alma Delia Genis‑Mendoza,Ana Fresan,Humberto Nicolini 한국유전학회 2021 Genes & Genomics Vol.43 No.11
Background Several studies have evaluated the possible association between polymorphisms or variants in Corticotropinreleasing hormone 1 receptor gene (CRHR1) with depression; however, results remain contradictory and heterogeneous. Objective To our knowledge, we conducted the frst comprehensive systematic review and meta-analysis evaluating the association of the CRHR1 gene and the risk of depression. Methods A search online was conducted in databases for any CRHR1 genetic association studies in depression. Data were extracted for evaluation of pooled estimates using meta-analytic techniques. Statistical analyses were performed using the Comprehensive Meta-analysis, v2.0 software. Result A total of 1403 cases and 2353 mentally healthy controls were included in this study. We found a signifcant association of rs242941, rs1876828 and rs242939 variants of the CRHR1 gene with depression. No association of CRHR1 rs110402 and depression was observed. Conclusion Our meta-analysis shows that some variants of the CRHR1 gene (rs242941, rs1876828 and rs242939) might confer susceptibility to depression. Further studies with larger sample sizes need to be conducted.