Abstract Objective To explore the expression levels and clinical value of FKBP10 in lung adenocarcinoma brain metastases. Design A retrospective single-institution cohort study. Patients The perioperative records of 71 patients with lung adenocarcinoma brain metastases who underwent surgical resection at the authors’ institution between November 2012 and June 2019 were retrospectively analyzed. Methods The authors evaluated FKBP10 expression levels using immunohistochemistry in tissue arrays of these patients. Kaplan-Meier survival curves were constructed, and a Cox proportional hazards regression model was used to identify independent prognostic biomarkers. A public database was used to detect FKBP10 expression and its clinical value in primary lung adenocarcinoma. Results The authors found that the FKBP10 protein was selectively expressed in lung adenocarcinoma brain metastases. Survival analysis showed that FKBP10 expression (p = 0.02, HR = 2.472, 95% CI [1.156, 5.289]), target therapy (p < 0.01, HR = 0.186, 95% CI [0.073, 0.477]), and radiotherapy (p = 0.006, HR = 0.330, 95% CI [0.149, 0.731]) were independent prognostic factors for survival in lung adenocarcinoma patients with brain metastases. The authors also detected FKBP10 expression in primary lung adenocarcinoma using a public database, found that FKBP10 is also selectively expressed in primary lung adenocarcinoma, and affects the overall survival and disease-free survival of patients. Limitations The number of enrolled patients was relatively small and patients’ treatment options varied. Conclusions A combination of surgical resection, adjuvant radiotherapy, and precise target therapy may benefit the survival of selected patients with lung adenocarcinoma brain metastases. FKBP10 is a novel biomarker for lung adenocarcinoma brain metastases, which is closely associated with survival time and may serve as a potential therapeutic target. FKBP FKBP1 singleinstitution single study 7 201 analyzed KaplanMeier Kaplan Meier constructed biomarkers p 002 0 02 0.02 2472 2 472 2.472 95 1.156, 1156 1 156 [1.156 5.289, 5289 5.289 , 5 289 5.289]) 001 01 0.01 0186 186 0.186 0.073, 0073 073 [0.073 0.477, 0477 0.477 477 0.477]) 0006 006 0.006 0330 330 0.330 0.149, 0149 149 [0.149 0.731 0731 731 0.731] diseasefree disease free varied 20 00 0.0 247 47 2.47 9 1.156 115 15 [1.15 528 5.28 28 5.289] 018 18 0.18 0.073 007 07 [0.07 047 0.47 0.477] 000 0.00 033 33 0.33 0.149 014 14 [0.14 0.73 73 0. 24 4 2.4 1.15 11 [1.1 52 5.2 0.1 0.07 [0.0 04 0.4 03 3 0.3 0.14 [0.1 0.7 2. 1.1 [1. 5. [0. 1. [1 [0 [

Abstract Background: exercise can increase the species and quantity of beneficial gut microbiota, enrich the diversity of microflora, and promote the development of symbiotic bacteria, especially in the stage of ontogeny. However, there is little evidence of the short-term voluntary exercise effect on the gut microbiota in developing mice. Material and method: therefore, we used short-term voluntary wheel running model to study the gut microbiota of developing mice (1 month old), and detected the fecal samples by 16S rRNA gene sequencing. Results: the results showed that after 4 weeks of voluntary wheel running, the body weight of the running group was significantly lower than that of the control group. Conclusion: there was a significant separation between the running group and the control group in beta diversity measures. At the family level, the clostridiales flora of the running group was higher than that of the control group. Compared with the control group, the abundance of parabacteroides flora and anaerovorax flora increased significantly, and the abundance of anaerotruncus flora and odoribacter flora decreased significantly in the running group. These results showed that gut microbiota be affected after short-term voluntary wheel running in developing mice.

Resumen Introducción: el ejercicio puede aumentar las especies y la cantidad de microbiota intestinal beneficiosa, enriquecer la diversidad de la microflora y promover el desarrollo de bacterias simbióticas, especialmente en la etapa de ontogenia. Sin embargo, hay poca evidencia del efecto del ejercicio voluntario a corto plazo sobre la microbiota intestinal en ratones en desarrollo. Material y método: por lo tanto, utilizamos un modelo de carrera de ruedas voluntario a corto plazo para estudiar la microbiota intestinal de ratones en desarrollo (1 mes de edad) y detectamos las muestras fecales mediante la secuenciación del gen 16S rRNA. Resultados: los resultados mostraron que después de 4 semanas de carrera voluntaria con ruedas, el peso corporal del grupo de carrera fue significativamente más bajo que el del grupo de control. Conclusión: hubo una diferencia significativa entre el grupo de corredores y el grupo de control en las medidas de diversidad beta. A nivel familiar, la flora de clostridiales del grupo de corredores fue mayor que la del grupo de control. En comparación con el grupo de control, la abundancia de flora parabacteroides y flora anaerovorax aumentó significativamente, y la abundancia de flora anaerotruncus y flora odoribacter disminuyó significativamente en el grupo de carrera. Estos resultados mostraron que la microbiota intestinal se ve afectada después de la carrera voluntaria a corto plazo en ratones en desarrollo.

Abstract Induced pluripotent stem (iPS) cells could be induced into ameloblast-like cells by ameloblasts serum-free conditioned medium (ASF-CM), and bone morphogenetic proteins (BMPs) might be essential during the regulation of this process. The present study investigates the signal transduction that regulates the ameloblastic differentiation of iPS cells induced by ASF-CM. Mouse iPS cells were characterized and then cultured for 14 days in epithelial cell medium (control) or ASF-CM. Bone morphogenetic protein receptor II (BMPR-II) siRNA, inhibitor of Smad1/5 phosphorylation activated by activin receptor-like kinase (ALK) receptors, and inhibitors of mitogen-activated protein kinases (MAPKs) phosphorylation were used to treat the iPS cells in combination with ASF-CM. Real-time PCR, western blotting, and immunofluorescent staining were used to evaluate the expressions of ameloblast markers ameloblastin, enamelin, and cytokeratin-14. BMPR-II gene and protein levels increased markedly in ASF-CM-treated iPS cells compared with the controls, while the mRNA levels of Bmpr-Ia and Bmpr-Ib were similar between the ASF-CM and control groups. ASF-CM stimulation significantly increased the gene and protein expression of ameloblastin, enamelin and cytokeratin-14, and phosphorylated SMAD1/5, p38 MAPK, and ERK1/2 MAPK compared with the controls. Knockdown of BMPR-II and inhibition of Smad1/5 phosphorylation both could significantly reverse the increased expression of ameloblastin, enamelin, and cytokeratin-14 induced by ASF-CM, while neither inhibition of p38 nor ERK1/2 phosphorylation had significant reversing effects. We conclude that smad1/5 signaling transduction, activated by ALK receptors, regulates the ameloblastic differentiation of iPS cells induced by ameloblast-conditioned medium.

OBJECTIVES: This study investigated whether tissue Doppler imaging parameters, especially the peak systolic velocity of the left ventricular lead-implanted segment (Ss), affect cardiac resynchronization therapy response. METHODS: In this case-control study, 110 enrolled patients were divided into cases (responder group, n=65) and controls (nonresponder group, n=45) based on whether their left ventricular end-systolic volume was reduced by ≥15% at 6 months after surgery. Preoperative clinical and echocardiographic data were collected. Multivariate logistic regression models were used to analyze the factors affecting the response to cardiac resynchronization therapy, and receiver operating characteristic curves were plotted to evaluate their diagnostic values. RESULTS: The proportion of patients with left bundle branch block in the case group was higher than that in the control group. The control group showed a higher left atrial volume index, E/A ratio and E/Em ratio but lower Ss than that of the case group. A multivariate regression analysis showed that left bundle branch block, Ss, and an E/Em ratio>14 were independent risk factors affecting the response to cardiac resynchronization therapy. Ss=4.1 cm/s was the best diagnostic threshold according to the receiver operating characteristic curve. CONCLUSIONS: Ss is an important factor affecting the response to cardiac resynchronization therapy. Patients with heart failure associated with Ss<4.1 cm/s have a higher risk of nonresponse.

The long non-coding RNA (lncRNA) maternally expressed gene 3 (MEG3), a tumor suppressor, is critical for the carcinogenesis and progression of different cancers, including hepatocellular carcinoma (HCC). To date, the roles of lncRNA MEG3 in HCC are not well illustrated. Therefore, this study used western blot and qRT-PCR to evaluate the expression of MEG3, miR-9-5p, and Sex determining Region Y-related HMG-box 11 (SOX11) in HCC tissues and cell lines. RNA pull-down and luciferase reporter assay were used to evaluate these molecular interactions. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and flow cytometry detected the viability and apoptosis of HCC cells, respectively. The results showed that MEG3 and SOX11 were poorly expressed but miR-9-5p was highly expressed in HCC. The expression levels of these molecules suggested a negative correlation between MEG3 and miR-9-5p and a positive correlation with SOX11, confirmed by Pearson's correlation analysis and biology experiments. Furthermore, MEG3 could combine with miR-9-5p, and SOX11 was a direct target of miR-9-5p. Moreover, MEG3 over-expression promoted cell apoptosis and growth inhibition in HCC cells through sponging miR-9-5p to up-regulate SOX11. Therefore, the interactions among MEG3, miR-9-5p, and SOX11 might offer a novel insight for understanding HCC pathogeny and provide potential diagnostic markers and therapeutic targets for HCC.

Resumen La enfermedad renal crónica afecta cerca del 10 % de la población mundial adulta: es una de las primeras 20 causas de muerte en el mundo y el impacto de la enfermedad en el paciente y sus familias puede ser devastador. En el 2018 el Día Mundial del Riñón y el Día Internacional de la Mujer coinciden, ofreciéndonos una oportunidad para demostrar el impacto que tiene la salud de la mujer, específicamente su salud renal, en la comunidad y en las generaciones futuras, es importante fomentar el conocimiento sobre aspectos específicos de la enfermedad renal en la mujer y poder aplicarlos de forma extensiva. Las mujeres y niñas representan aproximadamente el 50 % de la población mundial, siendo integrantes fundamentales de la sociedad y de sus familias. Las diferencias de género persisten alrededor del mundo, afectando su acceso a la educación, cuidados de salud y su inclusión en estudios clínicos. Actualmente, el embarazo en la mujer es una etapa única que ofrece la oportunidad de diagnosticar la enfermedad renal, donde las enfermedades renales agudas y crónicas pueden manifestarse, lo cual podría impactar en la salud renal de las generaciones futuras. Existen varias enfermedades autoinmunes y algunos otros factores que afectan más comúnmente a la mujer, con serias consecuencias durante el embarazo para la madre y para el feto. Las mujeres en diálisis en comparación con los hombres tienen complicaciones diferentes; además son más comúnmente donadoras que receptoras del trasplante renal. En esta editorial, nos enfocamos en qué hacemos y en qué no conocemos sobre la mujer, la salud y enfermedad renal, y qué podemos aprender para mejorar sus condiciones en todo el mundo.

Abstract Chronic Kidney Disease affects approximately 10% of the world's adult population: it is within the top 20 causes of death worldwide, and its impact on patients and their families can be devastating. World Kidney Day and International Women's Day in 2018 coincide, thus offering an opportunity to reflect on the importance of women's health and specifically their kidney health, on the community, and the next generations, as well as to strive to be more curious about the unique aspects of kidney disease in women so that we may apply those learnings more broadly. Girls and women, who make up approximately 50% of the world's population, are important contributors to society and their families. Gender differences continue to exist around the world in access to education, medical care, and participation in clinical studies. Pregnancy is a unique state for women, offering an opportunity for diagnosis of kidney disease, but also a state where acute and chronic kidney diseases may manifest, and which may impact future generations with respect to kidney health. There are various autoimmune and other conditions that are more likely to impact women with profound consequences for child bearing, and on the fetus. Women have different complications on dialysis than men, and are more likely to be donors than recipients of kidney transplants. In this editorial, we focus on what we do and do not know about women, kidney health, and kidney disease, and what we might learn in the future to improve outcomes worldwide.

Chronic Kidney Disease affects approximately 10% of the world's adult population: it is within the top 20 causes of death worldwide, and its impact on patients and their families can be devastating. World Kidney Day and International Women's Day in 2018 coincide, thus offering an opportunity to reflect on the importance of women's health and specifically their kidney health, on the community, and the next generations, as well as to strive to be more curious about the unique aspects of kidney disease in women so that we may apply those learnings more broadly. Girls and women, who make up approximately 50% of the world's population, are important contributors to society and their families. Gender differences continue to exist around the world in access to education, medical care, and participation in clinical studies. Pregnancy is a unique state for women, offering an opportunity for diagnosis of kidney disease, but also a state where acute and chronic kidney diseases may manifest, and which may impact future generations with respect to kidney health. There are various autoimmune and other conditions that are more likely to impact women with profound consequences for child bearing, and on the fetus. Women have different complications on dialysis than men, and are more likely to be donors than recipients of kidney transplants. In this editorial, we focus on what we do and do not know about women, kidney health, and kidney disease, and what we might learn in the future to improve outcomes worldwide.

La enfermedad renal crónica afecta al 10% de la población mundial adulta: está entre las primeras 20 causas de muerte. En 2018, el Día Mundial del Riñón y el Día Internacional de la Mujer coinciden para demostrar a la comunidad el impacto que tiene su salud renal, fomentar el conocimiento de la enfermedad y aplicarlos extensivamente. Las mujeres y las niñas representan, aproximadamente, el 50% de la población. Las diferencias de género persisten alrededor del mundo y afectan su acceso a la educación, los cuidados de salud y su inclusión en estudios clínicos. El embarazo es la oportunidad única para diagnosticar la enfermedad renal. Existen enfermedades autoinmunes y otras que afectan comúnmente a la mujer, con serias consecuencias para la madre y el feto. Las mujeres en diálisis tienen complicaciones diferentes a los hombres y son más donadoras que receptoras del trasplante renal. En esta ocasión, nos enfocamos en qué hacemos y qué no conocemos sobre la mujer, la salud y la enfermedad renal. Así, podremos aprender para mejorar sus condiciones en el mundo.

Chronic Kidney Disease affects approximately 10% of the world s adult population: it is within the top 20 causes of death worldwide, and its impact on patients and their families can be devastating. World Kidney Day and International Women s Day in 2018 coincide, thus offering an opportunity to reflect on the importance of women s health and specifically their kidney health, on the community, and the next generations, as well as to strive to be more curious about the unique aspects of kidney disease in women so that we may apply those learnings more broadly. Girls and women, who make up approximately 50% of the world s population, are important contributors to society and their families. Gender differences continue to exist around the world in access to education, medical care, and participation in clinical studies. Pregnancy is a unique state for women, offering an opportunity for diagnosis of kidney disease, but also a state where acute and chronic kidney diseases may manifest, and which may impact future generations with respect to kidney health. There are various autoimmune and other conditions that are more likely to impact women with profound consequences for child bearing, and on the fetus. Women have different complications on dialysis than men, and are more likely to be donors than recipients of kidney transplants. In this editorial, we focus on what we do and do not know about women, kidney health, and kidney disease, and what we might learn in the future to improve outcomes worldwide.

La Enfermedad Renal Crónica afecta cerca del 10% de la población mundial adulta: es una de las primeras 20 causas de muerte en el mundo y el impacto de la enfermedad en el paciente y sus familias puede ser devastador. En el 2018 el Día Mundial del Riñón y el Día Internacional de la Mujer coinciden, ofreciéndonos una oportunidad para demostrar el impacto que tiene la salud de la mujer, específicamente su salud renal, en la comunidad y en las generaciones futuras, fomentar el conocimiento sobre aspectos específicos de la enfermedad renal en la mujer y poder aplicarlos de forma extensiva. Las mujeres y niñas representan aproximadamente el 50% de la población mundial, siendo integrantes fundamentales de la sociedad y de sus familias. Las diferencias de género persisten alrededor del mundo, afectando su acceso a la educación, cuidados de salud y su inclusión en estudios clínicos. Actualmente, el embarazo en la mujer es una etapa única que ofrece la oportunidad de diagnosticar la enfermedad renal, donde las enfermedades renales agudas y crónicas pueden manifestarse, lo cual podría impactar en la salud renal de las generaciones futuras. Existen varias enfermedades autoinmunes y algunos otros factores que afectan más comúnmente a la mujer, con serias consecuencias durante el embarazo para la madre y para el feto. Las mujeres en diálisis en comparación con los hombres tienen complicaciones diferentes; además son más comúnmente donadoras que receptoras del trasplante renal. Nos enfocamos en que hacemos y en que no conocemos sobre la mujer, la salud y enfermedad renal, y que podemos aprender para mejorar sus condiciones en todo el mundo.

Chronic kidney disease affects approximately 10% of the world's adult population: it is within the top 20 causes of death worldwide, and its impact on patients and their families can be devastating. World Kidney Day and International Women's Day in 2018 coincide, thus offering an opportunity to reflect on the importance of women's health and specifically women’s kidney health on the community and the next generations, as well as to strive to be more curious about the unique aspects of kidney disease in women so that we may apply those learnings more broadly. Girls and women, who make up approximately 50% of the world's population, are important contributors to society and their families. Gender differences continue to exist around the world in access to education, medical care, and participation in clinical studies. Pregnancy is a unique state for women, offering an opportunity for diagnosis of kidney disease, but also a state in which acute and chronic kidney diseases may manifest, and which may impact future generations with respect to kidney health. Various autoimmune and other conditions are more likely to impact women, with profound consequences for child bearing and the fetus. Women have different complications on dialysis than men, and are more likely to be donors than recipients of kidney transplants. In this editorial, we focus on what we know and do not know about women, kidney health, and kidney disease, and what we might learn in the future to improve outcomes worldwide.

ABSTRACT Aim: The role of low-intensity extracorporeal shock wave therapy (LI-ESWT) in erectile dysfunction (ED) is not clearly determined. The purpose of this study is to investigate the short-term efficacy and safety of LI-ESWT for ED patients. Materials and Methods: Relevant studies were searched in Medline, Embase, Cochrane Library, China National Knowledge Infrastructure (CNKI), WANFANG and VIP databases. Effective rate in terms of International Index of Erectile Function-Erectile Function Domain (IIEF-EF) and Erectile Hardness Score (EHS) at about 1XSmonth after LI-ESWT was extracted from eligible studies for meta-analysis to calculate risk ratio (RR) of effective treatment in ED patients treated by LI-ESWT compared to those receiving sham-treatment. Results: Overall fifteen studies were included in the review, of which four randomized controlled trials (RCTs) were for meta-analysis. Effective treatment was 8.31 [95°/o confidence interval (CI): 3.88-17.78] times more effective in the LI-ESWT group (n=176) than in the sham-treatment group (n= 101) at about 1 month after the intervention in terms of EHS, while it was 2.50 (95% CI: 0.74–8.45) times more in the treatment group (n= 121) than in the control group (n=89) in terms of IIEF-EF. Nine-week protocol with energy density of 0.09mJ/mm2 and 1500 pluses seemed to have better therapeutic effect than five-week protocol. No significant adverse event was reported. Conclusion: LI-ESWT, as a noninvasive treatment, has potential short-term therapeutic effect on patients with organic ED irrespective of sensitivity to PDE5is. Owing to the limited number and quality of the studies, more large-scale, well-designed and longterm follow-up time studies are needed to confirm our analysis.

Abstract: Assessing snowmelt runoff in catchments without conducting intensive observations for water resource management is very important. This paper presents the modeling results of meltwater runoff in the Juntanghu River basin, where the river flow is dominated by glacier and snow meltwater from above the mid-altitude of the north central Tian Shan Mountains in Northwest China. The soil and water assessment tool (SWAT) model is used to assess the effects of potential climate change on the Juntanghu River basin. The model uses meteorological data, which include precipitation, temperature, wind, and solar radiation, to depict the impact of climate change on the river discharge in the Juntanghu watershed. The SWAT model is validated and verified against the observed discharge at the Hongshan reservoir at the outlet of the watershed from 1995 to 2010. The SWAT model can well differentiate between meltwater runoff from snow and that from glaciers in the basin. The R2 and Nash-Sutcliffe simulation efficiency values computed for the daily comparisons are 0.92 and 0.85 for the calibration period and 0.83 and 0.81 for the validation period, respectively. Experiments show that the hydrological cycle in the Juntanghu River basin may be altered under changing climatic scenarios. The mean annual stream flow changes in response to climate change projections are simulated using SWAT model. A rising mean temperature (T + 1 °C) in early spring results in a 2.14 times increase in the average daily stream flow (on February 27), whereas a higher rising temperature (T + 3 °C) results in an earlier snowmelt phenomenon. However, the snowmelt runoff from the preliminary to interim stages has less influence in relation to changes in the precipitation. The average daily flow changes of 1.07 times are predicted for precipitation change scenarios of 10%. The climate change scenarios show a large degree of uncertainty in terms of current climate change forecasts for the Juntanghu basin. The simulated Juntanghu hydrological cycle is also very sensitive to current forecasted climate changes under climate change conditions.

Resumen: La evaluación de la escorrentía del deshielo en las cuencas sin llevar a cabo observaciones intensivas para la gestión de los recursos hídricos es muy serio. Este trabajo presenta los resultados de los modelos de escorrentía de agua de deshielo en la cuenca del río Juntanghu, donde el caudal del río está dominado por glaciares y nieve, agua de fusión por encima de la mitad de altitud de la zona centro norte de Tian Shan en el noroeste de China. El modelo de herramienta de evaluación de suelos y aguas (SWAT) se utiliza para evaluar los efectos de un posible cambio climático en la cuenca del río Juntanghu. El modelo utiliza datos meteorológicos, que incluyen precipitación, temperatura, viento y radiación solar, para describir el impacto del cambio climático en el caudal de los ríos en la cuenca Juntanghu. El modelo SWAT es validado y verificado en contra de la aprobación de la gestión observada en el embalse de Hongshan a la salida de la cuenca de 1995 a 2010. El modelo SWAT también puede diferenciar entre el escurrimiento de agua de deshielo de la nieve y a partir de los glaciares en la cuenca. Los valores de eficiencia de simulación R2 y Nash-Sutcliffe calculadas para las comparaciones diarias son de 0.92 y 0.85 para el periodo de calibración, y 0.83 y 0.81 para el periodo de validación, respectivamente. Los experimentos muestran que el ciclo hidrológico en la cuenca del río Juntanghu puede alterarse bajo escenarios climáticos. Los cambios en el flujo de corrientes anuales medias en respuesta a las proyecciones del cambio climático se simula utilizando el modelo SWAT. Una temperatura media ascendente (T + 1 °C) en los resultados de primavera aumenta en un 2.14 veces en el flujo de la corriente media diaria (27 de febrero), mientras que un aumento de la temperatura más alta (T + 3 °C) da lugar a un fenómeno del deshielo temprano. Sin embargo, la escorrentía de deshielo de la preliminar a etapas intermedias tiene menos influencia en relación con los cambios en precipitación. Los cambios en el flujo promedio diario de 1.07 veces son los previstos en escenarios de cambio de precipitación (10%). Los escenarios de cambio climático muestran un alto grado de incertidumbre en cuanto a las previsiones de cambio climático actuales para la cuenca Juntanghu. El ciclo hidrológico Juntanghu simulado es también muy sensible a los cambios climáticos pronosticados actuales bajo condiciones de cambio climático.

The level of variation of simple sequence repeat (SSR) markers in cultivated alfalfa from American, Australian and Chinese sources was evaluated using a novel autotetraploid statistical method to calculate the effective number of alleles, the allele frequencies and heterozygosity. We used 19 SSR primers to screen seven polymorphic SSR loci in 320 plants from eight populations. The genetic distance and phylogenetic analysis (DISPAN) program was used to calculate the inter- and intra-population genetic relationships using the conventional binary absence/presence (0/1) method and our novel autotetraploid method. The autotetraploid method resulted in significantly higher heterozygosity (p < 0.01), average effective number (p < 0.01) and lower standard genetic distance (p < 0.01) than the binary method. Our results suggest that our new autotetraploid method is a very useful tool for assessing genetic variation and genetic relationships in all autotetraploid plant species.

A novel plastic poly (vinyl chloride) membrane electrode based on pethidine-reineckate ion-association complex as ion-exchange site for determination of pethidine hydrochloride in injections and tablets was described, in which the plasticizer was dibutyl phthalate. The linear response covered the range of 1x10-5~1x10-3 M drug concentration with a slope of 53.50 mV/decade. The practical pH range was 2~8. The lower detection limit was 4.36x10-6 M. There was negligible interference from a number of inorganic and organic cations and some common drug excipients. The proposed electrode had been successfully applied to determine pethidine hydrochloride in tablets and injections. The results were correlated well with those obtained by the United States Pharmacopoeia standard procedure

Se describe un nuevo electrodo de membrana basado en poli (vinilcloruro) con el complejo de asociación iónica demerol-Reinikato como sitio de intercambio para la determinación de demerol clorhidrato, tanto en inyecciones como en tabletas, en el cual se usa ftalato de dibutilo como plastificante. La respuesta lineal cubre el rango de concentración 1%10-5i1%10-3 M con una pendiente de 53.50 mV/decada. El rango práctico de pH fue 2 i 8. El límite más bajo de detección fue de 4.36%10-6 M. Hubo una interferencia insignificante de un número de cationes inorgánicos y orgánicos y de algunos excipientes comunes de drogas. El electrodo propuesto ha sido aplicado exitosamente para determinar el clorhidrato de petidina en tabletas e inyecciones. Los resultados están bien correlacionados con aquellos obtenidos por el procedimiento estandar de la Farmacopea de estados Unidos