High-throughput screening of Saccharomyces cerevisiae efficiently producing tyrosine / 生物工程学报

Tyrosine is an important aromatic amino acid. Besides its nutritional value, tyrosine is also an important precursor for the synthesis of coumarins and flavonoids. Previously, our laboratory constructed a Saccharomyces cerevisiae strain LTH0 (ARO4K229L, ARO7G141S, Δaro10, Δzwf1, Δura3) where tyrosine feedback inhibition was released. In the present study, heterologous expression of betaxanthins synthesis genes DOD (from Mirabilis jalapa) and CYP76AD1 (from sugar beet B. vulgaris) in strain LTH0 enabled production of yellow fluorescence. The engineered strain LTH0-DOD-CYP76AD1 was subjected to UV combined with ARTP mutagenesis, followed by flow cytometry screening. Among the mutants screened, the fluorescence intensity of the mutant strain LTH2-5-DOD-CYP76AD1 at the excitation wavelength of 485 nm and emission wavelength of 505 nm was (5 941±435) AU/OD, which was 8.37 times higher than that of strain LTH0-DOD-CYP76AD1. Fourteen mutant strains were subjected to fermentation to evaluate their tyrosine producing ability. The highest extracellular tyrosine titer reached 26.8 mg/L, which was 3.96 times higher than that of strain LTH0-DOD-CYP76AD1. Heterologous expression of the tyrosine ammonia lyase FjTAL derived from Flavobacterium johnsoniae further increased the titer of coumaric acid to 119.8 mg/L, which was 1.02 times higher than that of the original strain LTH0-FjTAL.

Case Report of Neonatal Proteus mirabilis Meningitis and Brain Abscess with Negative Initial Image Finding: Consideration of Serial Imaging Studies

Proteus mirabilis (P. mirabilis) meningitis in a neonate is rare, but its recognition is important because the disease progresses rapidly and has poor prognosis. A 4-day-old premature female infant born at 36 weeks and 5 days of gestation presented with symptoms of fever and icteric skin. Initial cerebrospinal fluid findings suggested bacterial meningitis, and treatment with antibiotics was started. On the third day, P. mirabilis growth was found in both blood and cerebrospinal fluid cultures and brain computed tomography revealed normal findings. The patient showed improved clinical symptoms, but brain magnetic resonance imaging on hospital day 18 revealed a brain abscess measuring 4.5×3.1×3.1 cm in the right frontal lobe. Cyst drainage was performed immediately and a catheter was inserted. Follow-up computed tomography revealed a tiny abscess remaining in the right frontal lobe, and follow-up magnetic resonance imaging later demonstrated marked interval regression in the size of the abscess. The patient was discharged on day 57 of hospitalization in good condition. Serial brain imaging should be considered in neonatal cases of P. mirabilis meningitis.

Antimicrobial property of lemongrass (Cymbopogon citratus) oil against pathogenic bacteria isolated from pet turtles / 한국실험동물학회지

The usage of essential oils as antimicrobial agents is gaining attention. Besides, pet turtles were known to harbor a range of pathogenic bacteria while the turtle keeping is a growing trend worldwide.The current study examined the antimicrobial activity of lemon grass oil (LGO) against seven species of Gram negative bacteria namely; Aeromonas hydrophila, A. caviae, Citrobacter freundii, Salmonella enterica, Edwardsiella tarda, Pseudomonas aeruginosa, and Proteus mirabilis isolated from three popular species of pet turtles. Along with the results of disc diffusion, minimum inhibitory and minimum bactericidal concentration (MIC and MBC) tests, LGO was detected as effective against 6 species of bacteria excluding P. aeruginosa. MIC of LGO for the strains except P. aeruginosa ranged from 0.016 to 0.5% (V/V). The lowest MIC recorded in the E. tarda strain followed by A. hydrophilla, C. freundii, P. mirabilis, and S. enterica. Interestingly, all the bacterial species except E. tarda were showing high multiple antimicrobial resistance (MAR) index values ranging from 0.36 to 0.91 upon the 11 antibiotics tested although they were sensitive to LGO.

Proteus vulgaris and Proteus mirabilis Decrease Candida albicans Biofilm Formation by Suppressing Morphological Transition to Its Hyphal Form

PURPOSE: Candida albicans (C. albicans) and Proteus species are causative agents in a variety of opportunistic nosocomial infections, and their ability to form biofilms is known to be a virulence factor. In this study, the influence of co-cultivation with Proteus vulgaris (P. vulgaris) and Proteus mirabilis (P. mirabilis) on C. albicans biofilm formation and its underlying mechanisms were examined. MATERIALS AND METHODS: XTT reduction assays were adopted to measure biofilm formation, and viable colony counts were performed to quantify yeast growth. Real-time reverse transcriptase polymerase chain reaction was used to evaluate the expression of yeast-specific genes (rhd1 and rbe1), filament formation inhibiting genes (tup1 and nrg1), and hyphae-related genes (als3, ece1, hwp1, and sap5). RESULTS: Candida biofilm formation was markedly inhibited by treatment with either living or heat-killed P. vulgaris and P. mirabilis. Proteus-cultured supernatant also inhibited Candida biofilm formation. Likewise, treatment with live P. vulgaris or P. mirabilis or with Proteus-cultured supernatant decreased expression of hyphae-related C. albicans genes, while the expression of yeast-specific genes and the filament formation inhibiting genes of C. albicans were increased. Heat-killed P. vulgaris and P. mirabilis treatment, however, did not affect the expression of C. albicans morphology-related genes. CONCLUSION: These results suggest that secretory products from P. vulgaris and P. mirabilis regulate the expression of genes related to morphologic changes in C. albicans such that transition from the yeast form to the hyphal form can be inhibited.

Pulmonary Pneumatocele in a Pneumonia Patient Infected with Extended-Spectrum beta-Lactamase Producing Proteus mirabilis / 결핵및호흡기질환

Pulmonary pneumatoceles are air-filled thin-walled spaces within the lung and are rare in adult cases of pneumonia. We report the case of a 74-year-old male who was admitted with a cough and sputum production. He had been treated with oral dexamethasone since a brain tumorectomy 6 months prior. Contrast-enhanced computed tomography (CT) of the chest revealed a large pneumatocele in the right middle lobe and peripheral pneumonic consolidation. Bronchoalveolar lavage was performed; cultures identified extended-spectrum beta-lactamase (ESBL) producing Proteus mirabilis. A 4-week course of intravenous ertapenem was administered, and the pneumatocele with pneumonia resolved on follow-up chest CT. To the best of our knowledge, this is the first reported case of pulmonary pneumatocele caused by ESBL-producing P. mirabilis associated with pneumonia.

Estados inmaduros y fenología de Catorhintha apicalis scrutator (Hemiptera: Heteroptera: Coreidae) en Michoacán, México / Immature stages and phenology of Catorhintha apicalis scrutator (Hemiptera: Heteroptera: Coreidae) in Michoacan, Mexico

Very little is known about the biology of Catorhintha species, for which a total of 32 species are known, with 10 species present in Mexico. The aim of this work was to describe the immature stages of Catorhintha apicalis scrutator. For this, adults and nymphs were collected as part of a project to study the Hemiptera diversity in contrasting environments in the Cuitzeo Basin, Michoacan. Sampling was done by direct collections and entomological nets; and a total of 523 individuals, 452 nymphs and 71 adults were collected during one year. The 84% of individuals were collected during the rainy season with the greater abundance in August and September, when Mirabilis jalapa (Nyctaginaceae) its host plant, was also more abundant in the study area. All instars were described and notes about their biology and phenology are provided, including the association with its host plant Mirabilis jalapa; besides, comparisons with other species in the genus Catorhintha were made. Rev. Biol. Trop. 62 (2): 579-587. Epub 2014 June 01.

Muy poco se conoce de la biología de las especies de Catorhintha, para el cual se existen 32 especies, 10 especies están presentes en México. El presente estudio, tuvo como objetivo la descripción de los estados inmaduros de Catorhintha apicalis scrutator. Como parte de un estudio sobre la biodiversidad de Hemípteros en ambientes contrastantes de la Cuenca de Cuitzeo, Michoacán, se recolectaron adultos y ninfas. El muestreo se hizo por medio de recolecta directa y red entomológica. Durante un periodo de un año, se recolectaron un total de 523 individuos, 452 ninfas y 71 adultos. El 84% de los individuos fueron recolectados durante la temporada de lluvias con una mayor abundancia entre Agosto y Septiembre, cuando Mirabilis jalapa (Nyctaginaceae), su planta huésped, también es más abundante en el área de estudio. Se describen e ilustran todos los estados de vida, incluyendo notas sobre su biología y fenología en asociación con la planta huésped Mirabilis jalapa; se hacen comparaciones con otras especies del género Catorhintha.

Analysis of photosynthetic characteristics and its influencing factors of medicinal plant Mirabilis himalaica / 中国中药杂志

To study photosynthetic characteristics and its influencing factors in leaves of medicinal plant Mirabilis himalaica, and provide an evidence for guiding artificial planting and improving the quantity. The light-response and diurnal photosynthesis course of leaves at the booting stages of 1-3 year old M. himalaica were measured with LI-6400 system. The Results showed that the light response curves were fitted well by non rectangle hyperbola equation (R2 > or = 0.98). The values of the maximum photosynthetic rate (Pmax) and light use efficiency of three-year old M. himalaica leaves were higher than those of 1-2 year old individuals. The diurnal variation of net photosynthetic rate (Pn) and stomatal conductance (Gs) of 2-3 year old M. himalaica were typical double-peak curves determinately regulated by stomatal conductance. However, transpiration rate (Tr) of 1-3 year old plants leaves were single-peak curve, which was self-protection of harm reduction caused by the higher temperature at noontime. Correlation analysis showed that the changes between photosynthetic active radiation (PFD), air temperature (T ) and Pn, were significant positive related. Therefore, M. himalaica is a typical sun plant, which should be planted under the sufficient sunshine field and prolong the growing ages suitably in order to improve the yield.

Postoperative Infectious Complications in Our Early Experience With Holmium Laser Enucleation of the Prostate for Benign Prostatic Hyperplasia

PURPOSE: The objective of this study was to retrospectively investigate postoperative infectious complications (PICs) in our early experience with holmium laser enucleation of the prostate (HoLEP) followed by mechanical morcellation for symptomatic benign prostatic hyperplasia. MATERIALS AND METHODS: A retrospective review was performed of the clinical data for 90 consecutive patients who underwent HoLEP at our institution between February 2008 and March 2011. All patients were evaluated for the emergence of PICs, including prophylactic antibiotic administration (PAA) and the influence of the kind or duration of PAA on PIC. The details of cases with PICs were also examined. RESULTS: The patients' mean age was 71 years (range, 50 to 95 years), and their mean prostate volume was 60 mL (range, 2 to 250 mL). There were 7 cases (7.78%) with PICs; in detail, 3 patients were diagnosed with prostatitis, 2 with pyelonephritis, and 2 with epididymitis. Three patients had positive urine cultures: 1 had Serratia marcescens/Proteus mirabilis, 1 had S. marcescens, and 1 had Klebsiella pneumonia; only one case had urological sepsis. Our statistical data showed no significant differences between 2 or fewer days and 3 or more days of PAA and PIC occurrence. There was also no significant effect on PIC occurrence of sulbactam/ampicillin compared with other antibiotics. CONCLUSIONS: The results of this retrospective study showed that PIC occurrence did not depend on the duration or the kind of PAA. Further prospective study is necessary for the evaluation and establishment of prophylactic measures for PICs.

Efeito da aplicação de maravilha (Mirabilis jalapa L. ), primavera (Bougainvillea spectabilis L. ) e isolados de Trichoderma na produção de alface / Effect of four o'clock flowers (Mirabilis jalapa L. ), bougainvillea (Bougainvillea spectabilis L. ) and Trichoderma spp. isolates in production of lettuce

Objetivou-se com esse trabalho avaliar o efeito de extratos foliares de primavera (Bougainvillea spetabilis L.) e maravilha (Mirabilis jalapa L.) e de Trichoderma spp., isoladamente ou em combinação, no manejo de viroses e na produção de alface. Os ensaios foram conduzidos em área de produção de hortaliças folhosas no município de Pinhalzinho/SP. O delineamento experimental foi de blocos casualizados, com dez tratamentos comparados com controle químico convencional. Foram observadas reduções de 18 por cento e 32 por cento na população de bactérias da rizosfera nas plantas de alface tratadas com o isolado IB18/22 e extrato de primavera + isolados de Trichoderma spp., respectivamente. Verificou-se que o extrato de maravilha estimulou o aumento do número de UFC/g da população de fungos. Entretanto, não houve diferença significativa na massa fresca da parte aérea e, apesar da pressão de inóculo e da alta densidade populacional de insetos vetores de vírus no local, não foi constatada a ocorrência de viroses, com exceção do espessamento de nervuras, que ocorreu em menor número em plantas tratadas, comparadas as do controle. Economicamente, houve 27,8 por cento de lucratividade e margem bruta de 38,5 por cento, indicando a viabilidade do uso de ferramentas de base ecológica no cultivo de alface. Além disso, os produtos usados são de fácil aquisição, seguros em termos de aplicação, meio ambiente e para o consumidor.

The aim of the work was to evaluate the effect of leaf extracts of bougainvillea (Bougainvillea spetabilis L.) and of four o'clock flowers (Mirabilis jalapa L.) plants and Trichoderma spp., alone or in combination, on viruses management and lettuce production. The tests were conducted in a producing area in Pinhalzinho-SP. The experimental design was randomized blocks with ten treatments in comparison with conventional chemical control. Reductions of 18 percent and 32 percent in the bacterial population of the lettuce rhizosphere treated with IB18/22 isolate and bougainvillea extract + Trichoderma spp. isolates, respectivelly, were observed. Four o'clock plant leaf extract stimulated growth of CFU / g number of fungi population. However, no significant change in fresh mass and size of lettuce was observed, and despite the inoculum pressure and high population density of virus vector insects in place, the occurrence of viruses was not found, except for big-vein syndrome which was higher in control than in treated plants. Economically, 27.8 percent net profit and 38.5 percent gross profit margin were verified, indicating that the use of ecological tools in lettuce crops is feasible. Moreover, the products are easy to obtain, safe to apply and safe for environment and human consumption.

Preparation of gold nanoparticles from Mirabilis jalapa flowers.

Biosynthesis of gold nanoparticles has emerged as an important area in nanotechnology and biotechnology due to growing need to develop environmentally benign technologies. Generally, nanoparticles are prepared by a variety of chemical methods which are not environmentally friendly. In the present study, we report a rapid and convenient method to reductively prepare gold nanoparticles from auric chloride using aqueous extract of Mirabilis jalapa flowers. The flower extract acts as a reducing agent and encapsulating cage for the gold nanoparticles. The production of gold nanoparticles has been done by the controlled reduction of the Au3+ ion to Au0. The formation of gold nanoparticles has been established by FT-IR and UV-Vis spectroscopy, as well as by TEM, XRD, EDAX and AFM. The study suggests that M. jalapa flowers can be a cheap source as a reductant for the production of gold nanoparticles.

The Wood-rotting Fungal Flora of Three Islands in the Yellow Sea, Korea

The wood-rotting fungi of three Korean islands in the Yellow Sea, Soyeonpyung-do (SY), Oeyeon-do (OY), and Gageo-do (GG), were investigated from October 2004 to November 2005. During four sampling trips on each island, a total of 46, 44, and 44 specimens were collected from SY, OY, and GG, respectively. The identified wood-rotting fungi from SY included 29 species of 22 genera and nine families; OY had 31 species of 26 genera and 10 families; and GG had 34 species of 27 genera and 11 families. The majority of the fungi were in the Polyporaceae, which was represented by 23 genera and 30 species. Auricularia polytricha, Daedaleopsis tricolor, Daldinia concentrica, Hymenochaete cinnamomea, Hymenochaete yasudai, Hyphoderma setigerum, Lopharia mirabilis, Schizopora paradoxa, and Trametes versicolor were collected from all three islands.

Use of Boronic Acid Disks for the Detection of Extended-spectrum beta-lactamase and AmpC beta-lactamase in Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca and Proteus mirabilis / 대한임상미생물학회지

BACKGROUND: Accurate detection of organisms producing extended-spectrum beta-lactamase (ESBL) and AmpC beta-lactamase is very important for treatment of patients. However, unlike the ESBL confirmatory test, there are no guidelines for detection of organisms producing AmpC beta-lactamase. We evaluated a detection method using boronic acid (BA) for ESBL and AmpC beta-lactamase. METHODS: Clinical isolates of Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, and Proteus mirabilis showing intermediate resistance or resistance to cefoxitin (FOX) or positive for ESBL were tested. A > or =5 mm increase in zone diameter of ceftazidime/clavulanic acid/BA (CAZ/CA/BA) and/or cefotaxime/clavulanic acid/BA (CTX/CA/BA) versus CAZ/BA and/or CTX /BA was considered positive for ESBL. Likewise, a > or =5 mm increase in zone diameter of FOX/BA and/or cefotetan/BA (CTT/BA) versus FOX and/or CTT alone was considered positive for AmpC beta-lactamase. RESULTS: Among 622 clinical isolates, ESBL positive rates by the CLSI ESBL confirmatory test or by the BA method were 18.1% or 18.4% for E. coli, 38.3% or 40.4% for K. pneumoniae, 8.7% or 8.7% for K. oxytoca, and 14.8% or 14.8% for P. mirabilis, respectively. AmpC beta-lactamase positive rates using the BA method were 3.7% for E. coli, 33.3% for K. pneumoniae, 0% for K. oxytoca, and 7.4% for P. mirabilis. The detection rates of coproducing ESBL and AmpC beta-lactamase were 2.4% in E. coli 27.1% in K. pneumoniae, and 3.7% in P. mirabilis. CONCLUSION: The ESBL confirmatory method using BA was found to enhance the detection of ESBLs, even when potentially masked by AmpC beta-lactamase.

Studies on chemical constituents from roots of Mirabilis jalapa / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the anti-HIV constituents from the root of Mirabilis jalapa.</p><p><b>METHOD</b>The compounds were isolated by column chromatography on silica gel, Sephadex LH - 20, MCI-gel CHP-20P and RP-18. The structure were identified by means of NMR and MS analyses (1H-NMR, 13C-NMR, MS).</p><p><b>RESULT</b>Eleven compounds were isolated and identified as astragaloside II (1), astragaloside II (2), astragaloside IV (3), astragaloside VI (4), flazin (5), 4'-hydroxy-2, 3-dihydroflavone 7-beta-D-glucopyranoside (6), gingerglycolipid A (7), 3, 4-dihydroxybenzaldehyd (8), p-hydroxybenzaldehyde (9), beta-sitosterol (10) and daucosterol (11).</p><p><b>CONCLUSION</b>Compounds 1-9 were obtained from this genus for the first time.</p>

Emergencia de la resistencia antibiótica debida a las ß-lactamasas de espectro extendido (blee): detección, impacto clínico y epidemiología / Emergence of antimicrobial resistance to extended-spectrum ß-lactamases (ESBL): detection, clinic impact and epidemiology

RESUMEN La rápida emergencia de la resistencia antimicrobiana debida a las BLEE tiene un impacto significativo en la salud pública. En los últimos 24 años ha suscitado un gran interés el conocimiento acerca de las BLEE, esta explosión de publicaciones abarca a todos los continentes y más de 30 países, actualmente es motivo de preocupación y se considera un problema de salud pública. Las BLEE son enzimas que producen los gram negativos y confieren resistencia a las penicilinas, a todas las cefalosporinas y al aztreonam, pero no a los carbapenems ni a las cefamicinas y la mayoría son inhibidas por el acido clavulanico. En general las BLEE son derivadas de TEM-1, TEM-2 y SHV-1, difieren entre si de sus progenitoras por unos escasos aminoácidos por lo que su filogenia es cercana. Son comúnmente encontradas en E.coli, Klebsiella sp, y P.mirabilis, no obstante, existen otras BLEE que difieren filogenéticamente de TEM y SHV, como las CTX-M, las carbapenemasas tipo OXA y las metalo-β-lactamasas VIM e IMP, típicamente encontradas en especies de P. aeruginosa, Serratia sp and Enterobacter sp. La producción de BLEE en los patógenos de importancia clínica es un problema serio en los pacientes hospitalizados debido a las implicaciones clínicas, terapéuticas y económicas. Las técnicas para la detección de las BLEE van de lo simple con aspectos fenotipicos hasta las pruebas complejas moleculares de geno-detección específica. El objetivo de esta revisión es discutir el impacto clínico y epidemiológico de las BLEE más prevalentes así como las técnicas para su detección y su seguimiento nosocomial.

ABSTRACT The rapid emerge of antimicrobial resistance dueto ESBL has a significant impact in public health. In the last 24 years, the study of extendedspectrumβ-lactamases (ESBL) has created great interest. This has been documented by publications from all continents and more than 30 countries, and the extent of this problem is a public health concern. ESBLs produced by Gram negative bacilli are enzymes that confer resistance to penicillins, cepaholosporins and aztreonam, but not to carbapenems or cephamycins, and are usually inhibited by clavulanic acid. Most of the ESBLs are derived from TEM-1, TEM-2 and SHV-1, and differ from their progenitors by only a few amino-acids. Thus, their phylogeny is close. ESBLs are usually found in E. coli, Klebsiellasp, and Proteus mirabilis. However, there are some ESBL phylogenetic branches that differ from TEM and SHV, such as CTX-M, OXA carbapenemases, VIM and IMP metalo-β-lactamases, typically found in P. aeruginosa, Serratia sp and Enterobacter sp . ESBL production by different clinical pathogens imply an important clinical problem in nosocomial patients due to medical, therapeutic and economical impact. ESBL detection techniques include simple tests as well as complex detection system involving molecular genotyping. This review discusses the most prevalent ESBLs and their epidemiological and clinical impact. Also, it presents tools and strategies for ESBL detection and molecular tracking at the nosocomial level.

Isolation Frequency of Extended Spectrum beta-Lactamase Producing Escherichia coli, Klebsiella species, and Proteus mirabilis / 대한임상미생물학회지

BACKGROUND: Accurate detection of extended spectrum beta-lactamase (ESBL) is important because ESBLproducing organisms may appear susceptible to oxyimino- beta-lactams in standard susceptibility tests, but are considered to be clinically resistant to these drugs. And continued monitoring of isolation trend of ESBL-producing organisms is essential for the guideline settlement of antibiotic usage and infection control program. METHODS: Disk diffusion test using the Clinical and Laboratory Standards Institute's ESBL phenotypic confirmatory test were performed on 5,511 clinical isolates of Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, and Proteus mirabilis during the recent six years (April 2001-March 2007). The ESBL producer was defined as an organism showing an increase in the zone diameter of > or =5 mm for either cefotaxime or ceftazidime with clavulanic acid versus that without clavulanic acid (CTC confirmatory test, CZC confirmatory test, respectively). RESULTS: The ESBL-positive rates were 34.8% in K. pneumoniae, 9.3% in K. oxytoca, 8.4% in E. coli, and 6.5% in P. mirabilis. Among the ESBL-positive organisms, the detection rates of ESBL CTC and CZC confirmatory tests were as follows: 91.3% vs 68.7% in K. pneumoniae, 96.3% vs 44.4% in K. oxytoca, 94.8% vs 45.4% in E. coli, and 100% vs 20% in P. mirabilis. ESBL-producing K. pneumoniae had shown a continuously increasing trend from 24.3% in 2001 to 46.4% in 2006. CONCLUSION: Both of the ESBL confirmatory tests should be simultaneously tested for the accurate detection of ESBL-producing K. pneumoniae, K. oxytoca, E. coli, and P. mirabilis. In addition, an active infection control approach is needed for ESBL-producing K. pneumoniae.

Studies on the antiulcer activity of Mirabilis jalapa Linn

The antiulcer activity of the aerial parts of Mirabilis jalapa Linn. [fam. Nyctaginaceae] was studied on albino rats. The antiulcer activity of the chloroform extract, ethanolic extract and aqueous extract was evaluated by using pyloric ligation models and alcohol induced ulceration model. All the test samples revealed significant antiulcer activity. The order of decreasing ulcer score was found to be aqueous extract < ethanol extract < chloroform extract in all performed models. The results indicate that the aerial parts of Mirabilis jalapa are endowed with potential antiulcer activity

Estudio farmacognóstico, fitoquímico y microbiológico de la Mirabilis jalapa L. 1998 / A pharmacodiagnostic, phytochemical and microbiological study of Mirabilis jalapa L. 1998

Se realizó un estudio en el Centro Provincial Desarrollo de la Medicina Tradicional y Natural a la droga Mirabilis jalapa L. (Maravilla), con el objetivo de conocer quiénes son los metabolitos responsables de la acción farmacológica que le es atribuida a la planta y se complementó con un estudio farmacognóstico y microbiológico. Dicho material vegetal fue previamente identificado y comparado con la muestra de Herbario #1215 del Jardín Botánico de Sancti-Spíritus, se recolectó en el mes de Octubre de 1998, en horas tempranas de la mañana, en áreas aledañas al poblado de Guayos. Se efectuó cuando las plantas se encontraban en su máximo estado de crecimiento y desarrollo, la misma se realizó al azar en bolsas de nylon y se trasladó hacia el lugar donde se realizó el estudio fitoquímico en forma fresca a la flor, de la cual se informaron sus características micro y macromorfológicas, estas se secaron a la sombra, sol y estufa con recirculación de aire, a una temperatura de 38 ºC. Posteriormente fueron trituradas y se determinó la composición química, no detectándose diferencias entre los metabolitos encontrados en la droga fresca y seca. A continuación se exponen los resultados de índices numéricos como: humedad residual, sustancias solubles, determinación de aceites esenciales, entre otros. Fue seleccionado el secado en estufa con recirculación de aire (38 ºC) como el de mayor eficacia para realizar el extracto fluido, el cual se elaboró por repercolación usando como menstruo una solución hidroalcohólica al 70% y se le hicieron estudios de estabilidad a temperatura ambiente y en refrigeración durante un período de 30 días, no presentó variaciones en su conservación. Se tomó una muestra de este preparado y se demostró la actividad antimicrobiana in vitro frente a las cepas de Staphylococos aureus coagulasa positivo, Escherichia coli y Candida albicans las cuales resultaron sensibles.[AU]

In Vitro Antimicrobial Activity of Cefroxadine, an Oral Cephalosporin, Against Major Clinical Isolates / 대한임상미생물학회지

BACKGROUND: Cefroxadine is an oral first-generation cephalosporin, which has been used for several years. But, the susceptibility data of cefroxadine were rarely reported in Korea. The current study attempted to determine the antibacterial activity of cefroxadine against the major clinical isolates. METHODS: According to the NCCLS recommendations, antibacterial activities of cefroxadine were measured against total 500 major clinical isolates. MICs were determined by the agar dilution method, a series of doubling dilutions from 128 to 0.03 /mL, on Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Citrobacter freundii, Serratia marcescens, Proteus mirabilis, and Staphylococcus spp. In case of Haemophilus influenzae, Streptococcus pneumoniae, and Moraxella catarrhalis, broth microdilution method, a series of doubling dilutions from 16 to 0.015 /mL, was performed. RESULTS: Cefroxadine had variable activity against Enterobacteriaceae. MIC cumulative curves showed that cefroxadine had relatively low MIC distributions against E. coli, K. pneumoniae and P. mirabilis, showing MIC50 were 4, 4, and 8 /mL, respectively. Against E. cloacae, C. freundii, and S. marcescens, cefroxadine 's MIC50 values ranged from 128 to >128 /mL. For clinical isolates of methicillin-susceptible Staphylococcus aureus and methicillin-susceptible Staphylococcus epidermidis, cefroxadine had MIC90 values were 4 /mL and 8 /mL, respectively. Cefroxadine had MIC50 values of 1 /mL and >16 /mL for penicillin-susceptible and penicillin-not-susceptible strains of S. pneumoniae, respectively. Cefroxadine had MIC50 values of 8 /mL and 4 /mL against H. influenzae and M. catarrhalis, respectively. CONCLUSION: Cefroxadine had good activity against gram-positive bacteria, except penicillin-resistant S. pneumoniae, and showed moderate antimicrobial activity against M. catarrhalis, E. coli, P. mirabilis, and K. pneumonaie. Cefroxadine had variable activity against Enterobacteriaceae other than the above-mentioned species.

In Vitro Antimicrobial Activity of Cefditoren pivoxil, an Oral Cephalosporin, against Major Clinical Isolates / 감염과화학요법

BACKGROUND: Cefditoren is an oral cephalosporin with excellent activity against Haemophilus influenzae, Streptococcus pneumoniae, and Moraxella catarrhalis, which are the predominant bacterial causes of community-acquired respiratory tract infections. The current study attempted to determine the antibacterial activity of cefditoren against the major clinical isolates. METHODS: According to the NCCLS recommendations, antibacterial activities of cefditoren were measured against total 504 major clinical isolates. MICs were determined by the agar dilution method, a series of doubling dilutions from 128 to 0.03 microgram/mL, on E. coli, K. pneumoniae, E. cloacae, C. freundii, S. marcescens, P. mirabilis, and Staphylococcus spp. In case of H. influenzae, S. pneumoniae, and M. catarrhalis, broth microdilution method, a series of doubling dilutions from 16 to 0.015 microgram/mL, was performed. RESULTS: Cefditoren had variable activity against Enterobacteriaceae. MIC cumulative curves showed that cefditoren had low MIC distributions against E. coli and P. mirabilis, and MIC90 were 8 and 0.5 microgram/mL, respectively. Against K. pneumoniae, E. cloacae, C. freundii, and S. marcescens, cefditoren's MIC90 values ranged from 32 to >128 microgram/mL. For clinical isolates of methicillin-susceptible S. aureus and methicillin-susceptible S. epidermidis, cefditoren had MIC90 values of 1 microgram/mL and 0.5 microgram/mL, respectively. Cefditoren had MIC90 values of 1 microgram/mL for penicillin-susceptible and penicillin-not-susceptible strains of S. pneumoniae. Cefditoren had MIC90 values of 0.03 microgram/mL and 0.5microgram/mL against H. influenzae and M. catarrhalis, respectively. CONCLUSION: Cefditoren had excellent activity against S. pneumoniae, H. influenzae, and M. catarrhalis. Cefditoren had variable activity against Enterobacteriaceae. The results of this study confirm the excellent activity of cefditoren against the major respiratory tract pathogens and suggest that cefditoren could be a good antibiotic for empiric oral treatment of community-acquired respiratory tract infections.

In Vitro Antimicrobial Activity of Cefditoren pivoxil, an Oral Cephalosporin, against Major Clinical Isolates / 감염과화학요법

BACKGROUND: Cefditoren is an oral cephalosporin with excellent activity against Haemophilus influenzae, Streptococcus pneumoniae, and Moraxella catarrhalis, which are the predominant bacterial causes of community-acquired respiratory tract infections. The current study attempted to determine the antibacterial activity of cefditoren against the major clinical isolates. METHODS: According to the NCCLS recommendations, antibacterial activities of cefditoren were measured against total 504 major clinical isolates. MICs were determined by the agar dilution method, a series of doubling dilutions from 128 to 0.03 microgram/mL, on E. coli, K. pneumoniae, E. cloacae, C. freundii, S. marcescens, P. mirabilis, and Staphylococcus spp. In case of H. influenzae, S. pneumoniae, and M. catarrhalis, broth microdilution method, a series of doubling dilutions from 16 to 0.015 microgram/mL, was performed. RESULTS: Cefditoren had variable activity against Enterobacteriaceae. MIC cumulative curves showed that cefditoren had low MIC distributions against E. coli and P. mirabilis, and MIC90 were 8 and 0.5 microgram/mL, respectively. Against K. pneumoniae, E. cloacae, C. freundii, and S. marcescens, cefditoren's MIC90 values ranged from 32 to >128 microgram/mL. For clinical isolates of methicillin-susceptible S. aureus and methicillin-susceptible S. epidermidis, cefditoren had MIC90 values of 1 microgram/mL and 0.5 microgram/mL, respectively. Cefditoren had MIC90 values of 1 microgram/mL for penicillin-susceptible and penicillin-not-susceptible strains of S. pneumoniae. Cefditoren had MIC90 values of 0.03 microgram/mL and 0.5microgram/mL against H. influenzae and M. catarrhalis, respectively. CONCLUSION: Cefditoren had excellent activity against S. pneumoniae, H. influenzae, and M. catarrhalis. Cefditoren had variable activity against Enterobacteriaceae. The results of this study confirm the excellent activity of cefditoren against the major respiratory tract pathogens and suggest that cefditoren could be a good antibiotic for empiric oral treatment of community-acquired respiratory tract infections.