• Journal of Astronomy and Space Sciences
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• 제15권1호
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• pp.151-162
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• 1998

Infrared absorption spectra of 9 bulk samples and 3 acid residues of meteorites were obtained in the mid-infrared region ($4000~400cm^{-1}$). From the know composition of meteorites studied, the possible absorption modes were investigated. Most bands of bulk samples occur in the region below $1200cm^{-1}$ and they are due to metallic oxides and silicates. The spectra of each group can be distinguished by its own characteristic bands. Acid residues show very distinct features from their bulk samples, and absorp-tion bands due to organic compounds are not evident in their spectra. Quantiative analyses for two carbonaceous (Allende CV3 and Murchison CM2) and one ordinary (Carraweena L3.9) chondrites were performed for the presence of fullerene ($C_{60}$) in the meteorites. We calculated the concentration of $C_{60}$ in the acid residues by curve-fitting the spectra with Gaussian functions. The upper limit of $C_{60}$ concentration in these meteorites appears to be less than an order of a few hundred ppm.

• 이베로아메리카
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• 제22권2호
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• pp.1-23
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• 2020

칠레 작가 호세 도노소의 소설 『시골 저택』은 불확실하고 모호한 작품이다. 한편으로는 정치적 알레고리라는 성격을 지니고 있으며, 다른 한편으로는 메타픽션이라는 성격을 지니고 있기 때문이다. 일차적으로 『시골 저택』은 1973년 피노체트의 군부 쿠데타에 대한 알레고리로 읽을 수 있다. 그러나 이런 읽기는 작품을 지나치게 단순하게 이해하는 것이다. 실제로는 칠레 현대사를 넘어서 중남미 역사에서 일어난 변혁과 좌절의 연대기에 대한 문학적 초상화이다. 메타픽션으로서 『시골 저택』은 이런 문학적 초상화의 담론적 성격을 드러내고, 작품 바깥에 엄연히 존재하는 현실을 환기하고자 한다. 이로써 도노소는 암울한 현실의 비일상적인 성격, 한시적인 성격, 허구적인 성격을 드러내고자 한다.

• Journal of Preventive Medicine and Public Health
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• 제50권2호
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• pp.127-132
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• 2017

Objectives: The aim of this study was to determine the prevalence of asymptomatic carriers of group A ${\beta}-hemolytic$ streptococci (GAS) in children living in a rural community and to investigate the association between episodes of acute pharyngitis and carrier status. Methods: Throat swabs were collected from September to November 2013 among children 5-13 years of age from a rural community (Maria Ignacia-Vela, Argentina). The phenotypic characterization of isolates was performed by conventional tests. Antimicrobial susceptibility was assayed for penicillin, tetracycline, chloramphenicol, erythromycin, and clindamycin (disk diffusion). The minimum inhibitory concentration was determined for penicillin, cefotaxime, tetracycline, and erythromycin. Results: The carriage of ${\beta}-hemolytic$ streptococci was detected in 18.1% of participants, with Streptococcus pyogenes in 18 participants followed by S. dysgalactiae ssp. equisimilis in 5. The highest proportion of GAS was found in 8 to 10-year-old children. No significant association between the number of episodes of acute pharyngitis suffered in the last year and the carrier state was detected (p>0.05). Tetracycline resistance (55.5%) and macrolide-resistant phenotypes (11.1%) were observed. Resistance to penicillin, cefotaxime, or chloramphenicol was not expressed in any streptococcal isolate. Conclusions: The present study demonstrated significant throat carriage of GAS and the presence of group C streptococci (S. dysgalactiae ssp. equisimilis) in an Argentinian rural population. These results point out the need for continuous surveillance of GAS and non-GAS carriage as well as of antimicrobial resistance in highly susceptible populations, such as school-aged rural children. An extended surveillance program including school-aged children from different cities should be considered to estimate the prevalence of GAS carriage in Argentina.