Advanced search


Knowledge area




210 results, page 1 of 10

Negative impact of oral health conditions on oral health related quality of life of community dwelling elders in Mexico city, a population based study

ROBERTO CARLOS CASTREJON PEREZ SOCORRO AIDA BORGES YAÑEZ María Esther Irigoyen Camacho LUIS PABLO CRUZ HERVERT (2017)

Aim: Oral health in old persons is frequently poor; non-functional prostheses are common and negatively affect quality of life. The objective of this study was to estimate the impact of oral health problems on oral health related quality of life in a sample of home dwelling Mexican elders.

Methods: Household survey in 655 persons 70 years old and over residing in one county in Mexico City.

Variables: Oral Health Related Quality of Life (Short version of the Oral Health Impact Profile validated in Mexico-OHIP-14-sp), self-perception of general and oral health, xerostomia, utilization of dental services, utilization and functionality of removable dental prostheses, dental and periodontal conditions, age, gender, marital status, schooling, depression, cognitive impairment and independence in activities of daily living (ADL). A negative binomial regression model was fitted.

Results: Mean age was 79.2 ± 7.1 years; 54.2% were women. Mean OHIP-14-Sp score was 6.8 ± 8.7, median was 4. The final model showed that men (RR = 1.30); persons with xerostomia (RR = 1.41); no utilization of removable prostheses (RR = 1.55); utilization of non-functional removable prostheses (RR = 1.69); fair self-perception of general health (RR = 1.34); equal (RR = 1.43) or worse (RR = 2.32) self-perception of oral health compared with persons of the same age; and being dependent for at least one ADL (RR = 1.71) increased the probability of higher scores of the OHIP-14-sp. Age, schooling, depression, cognitive impairment and periodontal conditions showed no association.

Conclusions: Oral rehabilitation can improve quality of life, health education and health promotion for the elder and their caregivers may reduce the risk of dental problems.

Article

MEDICINA Y CIENCIAS DE LA SALUD Ciencias médicas Ciencias clínicas Geriatría Personas mayores Elderly Envejecido Aged Calidad de vida Quality of life Xerostomía Xerostomia Encuesta de salud Health survey Periodontitis

Study of the influence of Xanthate Derivative Structures on Copper Sulfide Mineral Adsorption Under Acidic Conditions

GUSTAVO LOPEZ TELLEZ Dulce Maria Avila Marquez IVAN ALEJANDRO REYES DOMINGUEZ ALIEN BLANCO FLORES HELEN PAOLA TOLEDO JALDIN JAVIER AGUILAR CARRILLO DE ALBORNOZ Emmanuel josé Gutiérrez Castañeda (2018)

Artículo de investigación en revista indizada

Adsorption of commercial xanthate derivatives on copper sulfide mineral (covellite, CuS) was studied by kinetics and isotherm adsorption experiments. The adsorption of xanthate derivatives was confirmed by FTIR (Fourier transform infrared spectroscopy) and XPS (X-ray photoelectron spectroscopy) results. Experiments were performed with two different xanthate derivatives, C-4410 (O-pentyl S-2-propenyl ester) and C-4940 (isobutyl xanthogen ethyl formate), on individual doses of 0.05 g of powdered covellite. It was found that the equilibrium times at pH 2, 4, and 6 were different for both xanthate derivatives. The shortest times were achieved at pH 2 and 4. The results suggest that C-4110 can be used as collector in a wide range of pH, while C-4940 is limited to lower pH values. Pseudo first- and pseudo second-order kinetics models were thus applied to the experimental data for pH 2. The information obtained from the kinetics models combined with XPS allowed proposing the adsorption mechanism for the covellite-xanthate derivative pair. The adsorption takes place through a non-covalent interaction for C-4410 and chemisorption process for C-4940. The best-fitting isotherm models for C-4410 and C-4940 adsorption were Redlich–Peterson and Freundlich, respectively, which yield a maximum adsorption capacity of 57.07 mg g 1 for C-4410 and 44.62 mg g 1 for C-4940.

CONACYT CB-254952-2016

Article

Adsorption copper sulfide xanthate BIOLOGÍA Y QUÍMICA

Evaluación nutritiva de bloques multinutricionales elaborados con frutos de Stenocereus griseus y S. stellatus, en sustitución de melaza de caña de azúcar

RAMON SORIANO ROBLES Ladislao Arias GABRIELA RODRIGUEZ LICEA (2022)

Artículo de investigación que tiene por objetivo hacer una evaluación nutritiva de bloques multinutricionales elaborados con frutos de Stenocereus griseus y S. stellatus, en sustitución de melaza de caña de azúcar

The present study was carried out in order to evaluate the chemical composition, as well as the digestibility of organic matter and the NDF of multinutritional blocks (BMN) based on pitaya (Stenocereus griseus) and xoconostle (Stenocereus stellatus) in substitution of sugarcane molasses. BMN were made from (Stenocereus griseus L.) and (Stenocereus stellatus) whose composition in both cases was: whole fruit 35%, cement 3.00%, lime, 5.00%, salt 5.00%, urea 5.00%, molasses 15.00,% corn stubble 30.00 %, mineral salt 2%. The blocks made from pitaya (BMNP) had, on a dry basis, a CP percentage of 27.98 ± 0.75, compared to the blocks made with xoconostle (BMNX) (Stenocereus stellatus) 27.58 ± 0.78. The average crude fiber value for BMNP was 15.61 ± 2.61 vs. 15.52 ± 1.365 for BMNX and had no difference at (P> 05). Regarding NDF, the results show values (BMNP) of 36.65% ± 1.50 compared to BMNX 35.63% ± 0.54. With respect to the FAD, the amounts for BMNP 25.04% ± 0.74 and for BMNX 24.32% ± 0.87. The acid detergent lignin values were 5.31 ± 0.91 and 4.96 ± 0.6. In all cases there was no significant difference at (P> 05). The in vitro digestibility by means of the gas production technique showed a digestibility percentage for BMNP of 50.48 ± 3.85 and for BMNX of 57.15 ± 2.75. Tukey's test showed a significant difference at (P <05).

no patrocinadores, no financiación

Article

Multinutrient blocks in vitro gas production xoconostle pitaya cell wall CIENCIAS SOCIALES

ERÓTICA DEL VÍNCULO DE LAS EXPERIENCIAS INTERSEXUALES EN MÉXICO: INICIOS DE VIOLENCIA Y DERIVAS DEL DESEO

Mara Cristina Toledo Silvia (2021)

“Sentí el deseo de hacer esta tesis mientras vivía un duelo que no había podido llorar. Desconozco exactamente cómo decidí hacerla porque me sentía decaída. Estudiar ha constituido un aliciente para mí en varios momentos de mi vida. Pensé que hacer esta tesis me abriría nuevos sentidos e interpretaciones de las preguntas personales acordonadas en mi corazón. Sin duda alguna, los encuentros en el aula reavivaron mi pasión por investigar. La elaboración del texto que presento implicó un proceso de resistencia emocional de largo aliento, no solo por los retos de urdir una tesis, sino por la inesperada imposición de la pandemia de Covid-19. Con la nueva realidad, viví otras pérdidas y sentí cómo irrumpió la distancia física obligada. El confinamiento me trajo recuerdos de mi niñez, me hizo sentir desesperada, como si estuviera viviendo en un tiempo extraño e indefinible, ¿cómo podría sostener una tesis en un contexto así? Paradójicamente, la misma distancia y la partida de algunas personas me situó. Refiguré el abrazo que deseaba darle a mi abuela y tuve la palabra para abrazarla. Así avanzó esta investigación, a veces como un caballo desbocado; otras, con el andar de un caracol. Los hallazgos de esta indagación son producto de un camino guiado por intuición y pasión. Los descubrimientos, posiblemente contribuyan a discusiones futuras, no obstante, más allá de eso, deseo que la llegada a buen puerto de esta tesis, con su particular travesía, sea un sitio desde dónde se genere esperanza y valentía. Algunas personas me han preguntado desde dónde hablo sobre intersexualidad. Naturalmente, no tengo una única respuesta. En el proceso de escritura de la tesis, me surgieron atisbos de reflexividad sobre los múltiples espacios en los que he estado situada al investigar este tema. No he tenido un sólo sitio desde el cual hablar”.

Master thesis

Discriminación por orientación sexual. Intersexo. Órganos reproductores - Anormalidades. Trastornos sexuales. Diferenciación de sexo. Intersexualidad - Violencia. Tesis - Maestría en Antropología Social, CDMX. CIENCIAS SOCIALES SOCIOLOGÍA CAMBIO Y DESARROLLO SOCIAL EVOLUCIÓN DE LAS SOCIEDADES EVOLUCIÓN DE LAS SOCIEDADES

Influence of cellulase or xylanase on the in vitro rumen gas production and fermentation of corn stover

LAURA HAYDEE VALLEJO HERNANDEZ Abdelfattah Zeidan Mohamed Salem Ahmed E. Kholif MONA MOHAMED MOHAMED YASSEEN ELGHANDOUR Raul Fajardo NALLELY RIVERO PEREZ ADRIAN ZARAGOZA BASTIDA María Dolores Mariezcurrena Berasain (2015)

In vitro gas production (GP) technique was used to investigate effect of exogenous enzymes cellulase (CEL) or xylanase (XYL) at different doses on in vitro fermentation characteristics of corn stover. Enzymes were supplemented at 0 (control), 10, 20, 40 and 80 μg/g DM. Gas production was determined at 2, 4, 6, 8, 10, 12, 24, 36, 48 and 72 h of incubation. After 72 h, the incubation was stopped and supernatant pH was determined, and filtered to determine dry matter (DMD), neutral detergent fiber (NDFD) and acid detergent fiber (ADFD) degradabilities. Interaction effects occurred for enzyme type and dose for all measured gas parameters with exception of the lag time, DMD, organic matter degradability (OMD), NDFD, metabolizable energy (ME), short chain fatty acids (SCFA) and microbial crude protein (MCP) production. Cellulase and XYL increased GP (P<0.05) at different incubation hours with better results at the dose of 40 μg/g DM. The dose 80 μg XYL/g DM had the lowest GP compared to other doses. In addition, CEL and XYL decreased pH with increasing OMD, ME, SCFA and MCP production at 40 μg/ g DM of corn stover. The present results suggested that the level of CEL and XYL at 40 μg/g DM have higher GP than other levels of enzymes, imply this level can be more effectively to improve rumen fermentation; however, the difference of XYL between treatments and control was less than that of CEL.

Article

Cellulase Corn straw Fibrolytic enzyme In vitro fermentation Xylanase BIOLOGÍA Y QUÍMICA

Effect of exogenous xylanase on rumen in vitro gas production and degradability of wheat straw

Togtokhbayar Norovsambuu MARIA ANDREA CERRILLO SOTO GERMAN BUENDIA RODRIGUEZ MONA MOHAMED MOHAMED YASSEEN ELGHANDOUR Abdelfattah Zeidan Mohamed Salem URANKHAICH CHULUUNBAATAR NICHOLAS E. ODONGO Ahmed E. Kholif (2014)

In Mongolia, the low and seasonal yield of native pastures causes a feed gap between the annual pasture provision and the requirements of grazing ruminants. Therefore, there is a growing need to improve the feeding value of locally available resources such as wheat straw for supplementary feeding. Wheat straw constitutes an important source of roughage for ruminants. It typically contain more than 70% neutral detergent fiber (NDF) on a dry matter (DM) basis, with less than 40% total digestive tract digestibility of the NDF, even under ideal feeding conditions (NRC 2001).

The objective of this study was to determine effects of xylanase on in vitro gas production (GP) and in sacco degradability of wheat straw. Rumen fluid was obtained from three Mongolian native goats fitted with permanent rumen cannulas. The trial consisted of five doses (0, 0.5, 1.0, 1.5, 2.0 μL/g of substrate) of a commercial xylanase (Dyadic® xylanase PLUS, Dyadic International, Inc., Jupiter, FL, USA). For the in sacco degradability, different levels of xylanase enzyme were added directly onto 2 g of wheat straw in nylon bags and incubated in the rumen for 3, 6, 12, 24 and 48 h to estimate degradability of wheat straw. Total GP increased (P < 0.001) at all times of incubation at intermediate levels of xylanase. Methane production had a similar pattern at 3 and 12 h of incubation; increased linearly at 24 h of incubation, and was unaffected at 6 and 48 h of incubation. Rumen NH3-N concentration increased linearly at 3 h and the highest values were observed with intermediate enzyme levels. All ruminal volatile fatty acids increased linearly with intermediate levels of the fibrolytic enzyme. The in sacco rate of dry matter degradation decreased linearly (P = 0.020) with increasing enzymes. Intermediate levels of xylanase improved rumen kinetic fermentation and degradability. The outcome of this research indicated that the application of xylanase enzyme could improve in vitro GP fermentation of wheat straw.

Article

degradability gas production wheat straw xylanase BIOLOGÍA Y QUÍMICA

Órganos constitucionalmente autónomos y órganos de relevancia constitucional: de la descentralización administrativa a la autonomía constitucional

Constitutionally autonomous organizations and constitutionally relevant organizations: from administrative decentralization to constitutional autonomy

ADAN MALDONADO SANCHEZ (2019)

Adán Maldonado Sánchez. Candidato a maestro en Derecho Procesal Constitucional por la Universidad Panamericana, Ciudad de México; licenciado en Derecho y Ciencias Sociales con mención honorifica por la Universidad Michoacana de San Nicolás de Hidalgo. Obtuvo el “Premio Padre de la Patria” que otorga la Universidad Michoacana de San Nicolás de Hidalgo por desempeño académico, trabajó en la Suprema Corte de Justicia de la Nación adscrito a la ponencia del ministro Góngora Pimente

Universidad Iberoamericana Ciudad de México. Departamento de Derecho

Article

Órganos constitucionales autónomos Órganos de relevancia constitucional Diseños constitucionales Arquitectura constitucional Autonomous constitutional bodies Organs of constitutional relevance Constitutional designs Constitutional architecture CIENCIAS SOCIALES

Evaluación de los parámetros de sensado de compuestos poliméricos con nanotubos de carbono, respecto a la composición de la matriz polimérica a base de aceites de linaza xilitolado y epoxidado

ETHNICE DEHONOR MARQUEZ (2019)

Tesis de Doctorado en Ciencia de Materiales

Este trabajo consistió en la obtención de sensores de Compuestos Poliméricos Conductores (CPC), a base de aceites vegetales y Nanotubos de Carbono de Pared Múltiple (NTCPM); así como su evaluación a la presencia de diferentes disolventes.

Doctoral thesis

sensing Liseed Oil xilitol BIOLOGÍA Y QUÍMICA

Autodisplay of an endo-1,4-β-xylanase from Clostridium cellulovorans in Escherichia coli for xylans degradation

VICTOR EMMANUEL BALDERAS HERNANDEZ CARLOS JOEL SALAS MONTANTES Ana Paulina Barba de la Rosa Antonio de León Rodríguez (2021)

"In this work, the scale-up from 0.01 to 10 L process for the co-production of hydrogen (H2) and ethanol (EtOH) by a genetically engineered Escherichia coli that utilizes hemicellulosic hydrolysates from wheat straw pretreated (WSP) as substrate is presented. Co-production of biofuels was performed through the redirection of carbon-flux to ethanol by deleting ldhA (D-lactate dehydrogenase) and frdD (fumarate reductase) genes in an H2-overproducer strain (E. coli WDH). Resulting strain, E. coli WDH-LF (Delta hycA Delta frdD Delta ldhA), increased up to 70% and 167% the H2 and EtOH production from glucose compared with the parenteral strain. Using WSP as substrate, the yields of H2 and EtOH remained constant at all the evaluated scales. In 10 L bioreactors, the production parameters such as maximum production, production rate and yield were 5,603.0 +/- 233.5 mL H2/L, 41.4 +/- 4.0 mL H2/L/h, 342.7 +/- 14.3 mL H2/g TRS, 7.90 +/- 0.28 g EtOH/L and 0.48 +/- 0.01 g EtOH/g TRS, respectively. The results demonstrate the potential of the co-production of H2 and EtOH at different production scales by the engineered E. coli strain using lignocellulosic biomass as feedstock, such as wheat straw hydrolysates."

Article

AIDA Autodisplay Hemicellulose Whole cell biocatalysts Xylanase CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

La donación y trasplante de órganos en México, una política inconclusa

René Mendoza Arvizu (2017)

La presente investigación aborda los resultados que el gobierno ha tenido en un tema vital de salud, al tratarse de una cuestión que puede mejorar la situación de muchas personas y, en muchos casos, salvarles la vida: la donación y el trasplante de órganos. El aumento de enfermedades crónicas y de otros factores que llevan a que un individuo pierda la función de alguno de sus órganos, es una situación fatal para cualquier ser humano que trastoca a la propia sociedad, pues tener sujetos enfermos inhibe el desarrollo; en México, la brecha entre las personas que necesitan de un órgano y aquellas que logran ser trasplantadas se vuelve cada vez mayor, cifras oficiales muestran que solo 31.5% de las personas son atendidas, lo que sitúa al país en el lugar 42 de 84 en la materia, ello revela que las acciones gubernamentales son ineficaces, por lo que es necesario cuestionar dicha situación, que propicie que los actores gubernamentales y la sociedad misma comprendan que la donación y el trasplante de órganos es una política pública inconclusa, pero sobre todo, para que se efectué un replanteamiento de la misma, que propicie el incremento en la atención de los ciudadanos que lo necesitan.

The present research addresses the results that the government has had on a vital health issue, as it is an issue that can improve the situation of many people and, in many cases, save their lives: organ donation and transplantation. The increase of chronic diseases and other factors that cause an individual to lose the function of some of their organs, is a fatal situation for any human being that disrupts the society itself, since having sick subjects inhibits its development; In Mexico, the gap between people in need of an organ and those who manage to be transplanted is increasing, official figures show that only 31.5% of people are cared for, which places the country in the 42nd place of 84 in The matter, this reveals that government actions are ineffective, so it is necessary to question the situation, which allows government actors and society to understand that organ donation and transplantation is an unfinished public policy, but above all, for That a rethinking of the same one was carried out, that propitiates the increase in the attention of the citizens who need it.

Master thesis

Donación de Órganos Trasplantes de Órganos Políticas Públicas Salud Pública Política Gubernamental México CIENCIAS SOCIALES CIENCIAS SOCIALES