Enrique Arriola-Guevara - Academia.edu (original) (raw)
Papers by Enrique Arriola-Guevara
Expert Systems with Applications, 2016
Revista Peruana De Epidemiologia, 2011
Expert Systems with Applications, 2016
Food Chemistry, 2015
Polycyclic aromatic hydrocarbons (PAHs) are of significant interest due to their genotoxicity in ... more Polycyclic aromatic hydrocarbons (PAHs) are of significant interest due to their genotoxicity in humans. PAHs quantification in coffee is complex since some of its compounds interfere in the chromatographic analysis, which hinders the reliable determination of the PAHs. Analytical conditions for the ultrasound extraction, purification and quantification of 16 PAHs in roasted coffee were studied. The better extraction efficiency of benzo[a]pyrene (68%) from ground-roasted coffee was achieved with a solvent ratio of Hex:MC (9:1 v/v) and three extraction periods of 20 min, followed by alkaline saponification and purification of the extracts. The detection limits were 0.85-39.32 ng mL(-1), and the quantification limits from 2.84 to 131.05 ng mL(-1), obtained for fluoranthene and chrysene, respectively. The extraction was effective for most of the analytes, with recoveries of 39.8% dibenzo[ah]anthracene and 69.0% benzo[b]fluoranthene. For coffee roasted in a spouted bed reactor, the summation of the 16 PAHs ranged from 3.5 to 16.4 μg kg(-1).
International Journal of Nursing Studies, 2008
Background: Although a number of studies have reported different domains of cancer patients' need... more Background: Although a number of studies have reported different domains of cancer patients' needs for help, very little is known about gender and ethnic differences in those needs. Gender differences have been implicitly assumed in most studies, and specific ethnic groups have been focused on rather than comparing several ethnic groups. Objectives: The purpose of this pilot study was to explore cancer patients' needs for help among four major ethnic groups in the US, to determine gender and ethnic differences in needs, and to provide direction for future studies. Design: This was a descriptive and comparative pilot study using a feminist perspective. Settings and participants: A total of 110 self-identified cancer patients were recruited through both Internet and community settings using a convenience sampling method. Methods: The instruments included sociodemographic questions, the Cancer Needs Questionnaire-Short Form, and the Supportive Care Needs Survey. The data were analyzed using descriptive statistics and inferential statistics including the Mann-Whitney U tests and Kruskal-Wallis tests. Results: The findings indicated that there was no significant gender difference in all domains of needs for help. There were significant ethnic differences in all domains of needs except communication and sexual needs. Asians reported the lowest scores in most domains of needs for help while Hispanics reported the highest scores in most domains of needs for help. Conclusions: The findings indicated certain ethnic differences in cancer patients' needs for help and suggest further indepth qualitative investigations on cultural beliefs and attitudes that may influence needs, with a careful examination of gender sensitivity and cultural competence of the instruments measuring cancer patients' needs for help. r
Studies in health technology and informatics
Health care inequities continue to plague African Americans. For African American cancer patients... more Health care inequities continue to plague African Americans. For African American cancer patients these inequities include access to health care, availability of treatment modalities, support groups, and participation in nursing cancer research. A support group setting is better for recruitment than a clinical setting. Referrals to the researcher from individuals who personally know the African American cancer patients generated the best response rates. If the researcher has no previous connection with the potential participant, interest in the study may be generated but recruitment is minimal or absent. Ethnically sensitive recruitment of African American cancer patients is therefore essential to improving participatory responses in cancer nursing research.
Bioresource Technology, 2014
Oncology Nursing Forum, 2007
To the Lord
Oncology Nursing Forum, 2007
To explore Hispanic patients' cancer pain experience from a feminist pers... more To explore Hispanic patients' cancer pain experience from a feminist perspective to find explanations for inadequate pain management. A qualitative online forum study. Internet and community settings. 15 Hispanic patients with cancer recruited using a convenience sampling method. A six-month online forum was conducted using nine discussion topics, and the data were processed using a thematic analysis. Cancer pain experience. Four major themes emerged related to the following findings. The first was a lack of communication with healthcare providers regarding undermedication. The second was that women and men were enduring pain because of traditional gender roles guiding their behaviors. Third, participants placed the highest priority on family during the diagnosis and treatment process, thus setting aside their needs for pain management. The fourth theme was that participants were enduring inconvenience and unfair treatment in the U.S. healthcare system while simultaneously appreciating the treatment they had received. Because of cultural factors and marginalized status in the United States as Hispanics and as immigrants, most of the participants could not adequately describe and manage their pain. Findings suggest a need for further investigation of the influences of multiple factors, including financial issues, cultural norms, and gender stereotypes, on cancer pain experience among diverse subgroups of Hispanic patients with cancer.
Nursing Research, 2007
Inconsistent findings on ethnic differences in cancer pain experience suggest the need for furthe... more Inconsistent findings on ethnic differences in cancer pain experience suggest the need for further studies on this topic for adequate cancer pain management. To determine ethnic differences in cancer pain experience of four ethnic groups in the United States. A feminist perspective was used as the theoretical basis. This was a survey of a multiethnic sample of 480 cancer patients asking questions on sociodemographic characteristics and health or illness status, 3 unidimensional cancer pain scales, 2 multidimensional cancer pain scales, the Memorial Symptom Assessment Scale, and the Functional Assessment of Cancer Therapy Scale. The data were analyzed using descriptive and inferential statistics including ANOVA and hierarchical multiple regression analyses. The results indicated certain ethnic differences in types of pain and symptoms that patients experienced. Also, the results demonstrated significant ethnic differences in cancer pain and functional status. The findings suggest further in-depth qualitative exploration on cultural values and beliefs related to cancer pain in each ethnic group and national studies with a larger number of ethnic minorities on this topic.
Nursing Research, 2009
Cultural values and beliefs related to cancer and pain have been used to explain ethnic differenc... more Cultural values and beliefs related to cancer and pain have been used to explain ethnic differences in cancer pain experience. Yet, very little is known about similarities and differences in cancer pain experience among different ethnic groups. The objective of this study was to explore similarities and differences in cancer pain experience among four major ethnic groups in the United States. A feminist approach by Hall and Stevens was used. This was a cross-sectional qualitative study among 22 White, 15 Hispanic, 11 African American, and 27 Asian patients with cancer recruited through both Internet and community settings. Four ethnic-specific online forums were conducted for 6 months. Nine topics related to cancer pain experience were used to guide the online forums. The collected data were analyzed using thematic analysis involving line-by-line coding, categorization, and thematic extraction. All participants across ethnic groups reported "communication breakdowns" with their healthcare providers and experienced "changes in perspectives." All of them reported that their cancer pain experience was "gendered experience." White patients focused on how to control their pain and treatment selection process, whereas ethnic minority patients tried to control pain by minimizing and normalizing it. White patients sought out diverse strategies of pain management; ethnic minority patients tried to maintain normal lives and use natural modalities for pain management. Finally, the cancer pain experience of White patients was highly individualistic and independent, whereas that of ethnic minority patients was family oriented. These findings suggest that nurses need to use culturally competent approaches to cancer pain management for different ethnic groups. Also, the findings suggest further in-depth cultural studies on the pain experience of multiethnic groups of patients with cancer.
Journal of Geophysical Research, 2009
1] A proposed conceptual model of Vulcanian explosions describes the volcanic explosion process a... more 1] A proposed conceptual model of Vulcanian explosions describes the volcanic explosion process as consisting of two stages (the movement of the fragmented magma to the surface and a subsequent explosion) and is constrained by four source parameters inferred from broadband seismic records (the counter force of the eruption F acting in the conduit before an explosion and governing the fragmented magma movement to the surface, the time D 1 of the movement of fragmented magma in the conduit before an explosion, the duration of the explosion in the conduit D 2 , and the energy E of the explosion). Our paper discusses, within the framework of the proposed conceptual model, the source scaling relationship inferred from the parameters of 135 Vulcanian explosions occurring at two Mexican andesitic volcanoes: Volcán de Colima and Popocatépetl during 1996-2006. Two groups of explosions are discriminated, small (E < 10 11 J) and large (E ! 10 11 J), characterized by a different type of scaling and origin. The scaling of the counter force F on the source duration t of the single force is different for large and small explosions but is characterized by the same tendency of F $ t 2 . According to the dependence E versus D 1 , large explosions are generated within the narrow depth zone in the conduit corresponding to D 1 from 3.5 to 7.5 s while small explosions are generated within a wide depth zone corresponding to D 1 from 0 to 13 s. The counter force of the eruption strongly governs the energy of explosions. The duration of the explosion at the explosion surface within the conduit, D 2 , has a tendency to negatively correlate with the energy of the explosion. Citation: Zobin, V. M., G. A. Reyes, E. Guevara, and M. Bretón (2009), Scaling relationship for Vulcanian explosions derived from broadband seismic signals,
Información tecnológica, 2006
... Cassidy A., Committee on Toxicity draft report on phyto-oestrogens and health, review of prop... more ... Cassidy A., Committee on Toxicity draft report on phyto-oestrogens and health, review of proposed health effects of phyto-oestrogen ... Papinutti Victor L., Diorio Luis A. y Forchiassin Flavio, Degradación de madera de álamo por Fomes sclerodermeus: producción de enzimas ...
Información tecnológica, 2007
Se presenta un análisis comparativo de modelos de flujo desarrollados para los sólidos de un sist... more Se presenta un análisis comparativo de modelos de flujo desarrollados para los sólidos de un sistema de lechos fuente en multietapa (multistage spouted bed) diseñado por . Se seleccionaron modelos de distribución del tiempo de residencia de los sólidos adecuados para la aplicación comercial del sistema en el tratamiento de granos y semillas. La determinación experimental de la función de distribución del tiempo de residencia se llevó acabo mediante la técnica estímulorespuesta utilizando partículas coloreadas. Se compararon cuatro modelos: tres de compartimentos y el de tanques-en-serie. La comparación de esos modelos mostró que los de compartimentos son los más apropiados para aplicaciones comerciales. El análisis estadístico permite afirmar que el modelo más recomendable, debido a su simplicidad, es el modelo de compartimentos propuesto por Arriola.
Earth and Planetary Science Letters, 2008
a b s t r a c t Editor: C.P. Jaupart Keywords: volcanic explosion broadband seismic record magma ... more a b s t r a c t Editor: C.P. Jaupart Keywords: volcanic explosion broadband seismic record magma fragmentation
CIN: Computers, Informatics, Nursing, 2007
The purpose of this study was to describe characteristics of cancer patients who were attending I... more The purpose of this study was to describe characteristics of cancer patients who were attending Internet cancer support groups and to provide direction for future research. A total of 204 cancer patients were recruited through Internet cancer support groups by posting the study announcement on the Web sites of such groups. The participants were asked to fill out Internet survey questionnaires on sociodemographic characteristics and health/disease status. The data were analyzed using descriptive and inferential statistics, including t tests, analysis of variance, and Chi-square tests. Findings indicate that cancer patients recruited through Internet cancer support groups tended to be middle-aged, well-educated, female, and middle class. The findings also indicate that there were significant differences in some characteristics according to gender and ethnicity. Based on the findings, some implications are suggested for future research using and developing Internet cancer support groups.
CIN: Computers, Informatics, Nursing, 2010
Despite positive reports about Internet cancer support groups, studies have rarely addressed how ... more Despite positive reports about Internet cancer support groups, studies have rarely addressed how to choose an appropriate Internet cancer support group to conduct research. The purpose of this article was to propose evaluation criteria for selecting Internet cancer support groups from which to recruit research participants. The authors developed proposed criteria while conducting an Internet-based study of cancer pain experience among cancer patients recruited through Internet cancer support groups. During recruitment and data collection, the researchers conducted biweekly discussions about recruitment progress and kept detailed records about issues that arose in the process of identifying, contacting, and announcing the study in Internet cancer support groups. Then, the written records were analyzed using content analysis to develop the evaluation criteria. The evaluation criteria developed were (1) private or public domains, (2) mission and purpose of the Internet cancer support group, (3)target users of the Internet cancer support group, (4) scope of the Internet cancer support group, (5) contents of the Internet cancer support group, (6) logistics for study announcements in the Internet cancer support group, (7) dynamics within the Internet cancer support group, and (8) credibility and authenticity of the owner/administrator of the Internet cancer support group. Because these criteria were developed from experiences gained during only one study, further development and refinement of the evaluation criteria are essential.
Bioresource Technology, 2016
The aim of this work was to obtain fermentable sugars by enzymatic or acid hydrolyses of Agave te... more The aim of this work was to obtain fermentable sugars by enzymatic or acid hydrolyses of Agave tequilana Weber bagasse in order to produce succinic acid with Actinobacillus succinogenes. Hydrolyses were carried out with mineral acids (sulfuric and hydrochloric acids) or a commercial cellulolytic enzyme, and were optimized statistically by a response surface methodology, having as factors the concentration of acid/enzyme and time of hydrolysis. The concentration of sugars obtained at optimal conditions for each hydrolysis were 21.7, 22.4y 19.8g/L for H2SO4, HCl and the enzymatic preparation respectively. Concerning succinic acid production, the enzymatic hydrolyzates resulted in the highest yield (0.446g/g) and productivity (0.57g/Lh) using A. succinogenes in a batch reactor system. Repeated batch fermentation with immobilized A. succinogenes in agar and with the enzymatic hydrolyzates resulted in a maximum concentration of succinic acid of 33.6g/L from 87.2g/L monosaccharides after 5 cycles in 40h, obtaining a productivity of 1.32g/Lh.
Expert Systems with Applications, 2016
Revista Peruana De Epidemiologia, 2011
Expert Systems with Applications, 2016
Food Chemistry, 2015
Polycyclic aromatic hydrocarbons (PAHs) are of significant interest due to their genotoxicity in ... more Polycyclic aromatic hydrocarbons (PAHs) are of significant interest due to their genotoxicity in humans. PAHs quantification in coffee is complex since some of its compounds interfere in the chromatographic analysis, which hinders the reliable determination of the PAHs. Analytical conditions for the ultrasound extraction, purification and quantification of 16 PAHs in roasted coffee were studied. The better extraction efficiency of benzo[a]pyrene (68%) from ground-roasted coffee was achieved with a solvent ratio of Hex:MC (9:1 v/v) and three extraction periods of 20 min, followed by alkaline saponification and purification of the extracts. The detection limits were 0.85-39.32 ng mL(-1), and the quantification limits from 2.84 to 131.05 ng mL(-1), obtained for fluoranthene and chrysene, respectively. The extraction was effective for most of the analytes, with recoveries of 39.8% dibenzo[ah]anthracene and 69.0% benzo[b]fluoranthene. For coffee roasted in a spouted bed reactor, the summation of the 16 PAHs ranged from 3.5 to 16.4 μg kg(-1).
International Journal of Nursing Studies, 2008
Background: Although a number of studies have reported different domains of cancer patients' need... more Background: Although a number of studies have reported different domains of cancer patients' needs for help, very little is known about gender and ethnic differences in those needs. Gender differences have been implicitly assumed in most studies, and specific ethnic groups have been focused on rather than comparing several ethnic groups. Objectives: The purpose of this pilot study was to explore cancer patients' needs for help among four major ethnic groups in the US, to determine gender and ethnic differences in needs, and to provide direction for future studies. Design: This was a descriptive and comparative pilot study using a feminist perspective. Settings and participants: A total of 110 self-identified cancer patients were recruited through both Internet and community settings using a convenience sampling method. Methods: The instruments included sociodemographic questions, the Cancer Needs Questionnaire-Short Form, and the Supportive Care Needs Survey. The data were analyzed using descriptive statistics and inferential statistics including the Mann-Whitney U tests and Kruskal-Wallis tests. Results: The findings indicated that there was no significant gender difference in all domains of needs for help. There were significant ethnic differences in all domains of needs except communication and sexual needs. Asians reported the lowest scores in most domains of needs for help while Hispanics reported the highest scores in most domains of needs for help. Conclusions: The findings indicated certain ethnic differences in cancer patients' needs for help and suggest further indepth qualitative investigations on cultural beliefs and attitudes that may influence needs, with a careful examination of gender sensitivity and cultural competence of the instruments measuring cancer patients' needs for help. r
Studies in health technology and informatics
Health care inequities continue to plague African Americans. For African American cancer patients... more Health care inequities continue to plague African Americans. For African American cancer patients these inequities include access to health care, availability of treatment modalities, support groups, and participation in nursing cancer research. A support group setting is better for recruitment than a clinical setting. Referrals to the researcher from individuals who personally know the African American cancer patients generated the best response rates. If the researcher has no previous connection with the potential participant, interest in the study may be generated but recruitment is minimal or absent. Ethnically sensitive recruitment of African American cancer patients is therefore essential to improving participatory responses in cancer nursing research.
Bioresource Technology, 2014
Oncology Nursing Forum, 2007
To the Lord
Oncology Nursing Forum, 2007
To explore Hispanic patients&amp;amp;amp;#39; cancer pain experience from a feminist pers... more To explore Hispanic patients&amp;amp;amp;#39; cancer pain experience from a feminist perspective to find explanations for inadequate pain management. A qualitative online forum study. Internet and community settings. 15 Hispanic patients with cancer recruited using a convenience sampling method. A six-month online forum was conducted using nine discussion topics, and the data were processed using a thematic analysis. Cancer pain experience. Four major themes emerged related to the following findings. The first was a lack of communication with healthcare providers regarding undermedication. The second was that women and men were enduring pain because of traditional gender roles guiding their behaviors. Third, participants placed the highest priority on family during the diagnosis and treatment process, thus setting aside their needs for pain management. The fourth theme was that participants were enduring inconvenience and unfair treatment in the U.S. healthcare system while simultaneously appreciating the treatment they had received. Because of cultural factors and marginalized status in the United States as Hispanics and as immigrants, most of the participants could not adequately describe and manage their pain. Findings suggest a need for further investigation of the influences of multiple factors, including financial issues, cultural norms, and gender stereotypes, on cancer pain experience among diverse subgroups of Hispanic patients with cancer.
Nursing Research, 2007
Inconsistent findings on ethnic differences in cancer pain experience suggest the need for furthe... more Inconsistent findings on ethnic differences in cancer pain experience suggest the need for further studies on this topic for adequate cancer pain management. To determine ethnic differences in cancer pain experience of four ethnic groups in the United States. A feminist perspective was used as the theoretical basis. This was a survey of a multiethnic sample of 480 cancer patients asking questions on sociodemographic characteristics and health or illness status, 3 unidimensional cancer pain scales, 2 multidimensional cancer pain scales, the Memorial Symptom Assessment Scale, and the Functional Assessment of Cancer Therapy Scale. The data were analyzed using descriptive and inferential statistics including ANOVA and hierarchical multiple regression analyses. The results indicated certain ethnic differences in types of pain and symptoms that patients experienced. Also, the results demonstrated significant ethnic differences in cancer pain and functional status. The findings suggest further in-depth qualitative exploration on cultural values and beliefs related to cancer pain in each ethnic group and national studies with a larger number of ethnic minorities on this topic.
Nursing Research, 2009
Cultural values and beliefs related to cancer and pain have been used to explain ethnic differenc... more Cultural values and beliefs related to cancer and pain have been used to explain ethnic differences in cancer pain experience. Yet, very little is known about similarities and differences in cancer pain experience among different ethnic groups. The objective of this study was to explore similarities and differences in cancer pain experience among four major ethnic groups in the United States. A feminist approach by Hall and Stevens was used. This was a cross-sectional qualitative study among 22 White, 15 Hispanic, 11 African American, and 27 Asian patients with cancer recruited through both Internet and community settings. Four ethnic-specific online forums were conducted for 6 months. Nine topics related to cancer pain experience were used to guide the online forums. The collected data were analyzed using thematic analysis involving line-by-line coding, categorization, and thematic extraction. All participants across ethnic groups reported &amp;amp;amp;amp;amp;amp;amp;amp;amp;quot;communication breakdowns&amp;amp;amp;amp;amp;amp;amp;amp;amp;quot; with their healthcare providers and experienced &amp;amp;amp;amp;amp;amp;amp;amp;amp;quot;changes in perspectives.&amp;amp;amp;amp;amp;amp;amp;amp;amp;quot; All of them reported that their cancer pain experience was &amp;amp;amp;amp;amp;amp;amp;amp;amp;quot;gendered experience.&amp;amp;amp;amp;amp;amp;amp;amp;amp;quot; White patients focused on how to control their pain and treatment selection process, whereas ethnic minority patients tried to control pain by minimizing and normalizing it. White patients sought out diverse strategies of pain management; ethnic minority patients tried to maintain normal lives and use natural modalities for pain management. Finally, the cancer pain experience of White patients was highly individualistic and independent, whereas that of ethnic minority patients was family oriented. These findings suggest that nurses need to use culturally competent approaches to cancer pain management for different ethnic groups. Also, the findings suggest further in-depth cultural studies on the pain experience of multiethnic groups of patients with cancer.
Journal of Geophysical Research, 2009
1] A proposed conceptual model of Vulcanian explosions describes the volcanic explosion process a... more 1] A proposed conceptual model of Vulcanian explosions describes the volcanic explosion process as consisting of two stages (the movement of the fragmented magma to the surface and a subsequent explosion) and is constrained by four source parameters inferred from broadband seismic records (the counter force of the eruption F acting in the conduit before an explosion and governing the fragmented magma movement to the surface, the time D 1 of the movement of fragmented magma in the conduit before an explosion, the duration of the explosion in the conduit D 2 , and the energy E of the explosion). Our paper discusses, within the framework of the proposed conceptual model, the source scaling relationship inferred from the parameters of 135 Vulcanian explosions occurring at two Mexican andesitic volcanoes: Volcán de Colima and Popocatépetl during 1996-2006. Two groups of explosions are discriminated, small (E < 10 11 J) and large (E ! 10 11 J), characterized by a different type of scaling and origin. The scaling of the counter force F on the source duration t of the single force is different for large and small explosions but is characterized by the same tendency of F $ t 2 . According to the dependence E versus D 1 , large explosions are generated within the narrow depth zone in the conduit corresponding to D 1 from 3.5 to 7.5 s while small explosions are generated within a wide depth zone corresponding to D 1 from 0 to 13 s. The counter force of the eruption strongly governs the energy of explosions. The duration of the explosion at the explosion surface within the conduit, D 2 , has a tendency to negatively correlate with the energy of the explosion. Citation: Zobin, V. M., G. A. Reyes, E. Guevara, and M. Bretón (2009), Scaling relationship for Vulcanian explosions derived from broadband seismic signals,
Información tecnológica, 2006
... Cassidy A., Committee on Toxicity draft report on phyto-oestrogens and health, review of prop... more ... Cassidy A., Committee on Toxicity draft report on phyto-oestrogens and health, review of proposed health effects of phyto-oestrogen ... Papinutti Victor L., Diorio Luis A. y Forchiassin Flavio, Degradación de madera de álamo por Fomes sclerodermeus: producción de enzimas ...
Información tecnológica, 2007
Se presenta un análisis comparativo de modelos de flujo desarrollados para los sólidos de un sist... more Se presenta un análisis comparativo de modelos de flujo desarrollados para los sólidos de un sistema de lechos fuente en multietapa (multistage spouted bed) diseñado por . Se seleccionaron modelos de distribución del tiempo de residencia de los sólidos adecuados para la aplicación comercial del sistema en el tratamiento de granos y semillas. La determinación experimental de la función de distribución del tiempo de residencia se llevó acabo mediante la técnica estímulorespuesta utilizando partículas coloreadas. Se compararon cuatro modelos: tres de compartimentos y el de tanques-en-serie. La comparación de esos modelos mostró que los de compartimentos son los más apropiados para aplicaciones comerciales. El análisis estadístico permite afirmar que el modelo más recomendable, debido a su simplicidad, es el modelo de compartimentos propuesto por Arriola.
Earth and Planetary Science Letters, 2008
a b s t r a c t Editor: C.P. Jaupart Keywords: volcanic explosion broadband seismic record magma ... more a b s t r a c t Editor: C.P. Jaupart Keywords: volcanic explosion broadband seismic record magma fragmentation
CIN: Computers, Informatics, Nursing, 2007
The purpose of this study was to describe characteristics of cancer patients who were attending I... more The purpose of this study was to describe characteristics of cancer patients who were attending Internet cancer support groups and to provide direction for future research. A total of 204 cancer patients were recruited through Internet cancer support groups by posting the study announcement on the Web sites of such groups. The participants were asked to fill out Internet survey questionnaires on sociodemographic characteristics and health/disease status. The data were analyzed using descriptive and inferential statistics, including t tests, analysis of variance, and Chi-square tests. Findings indicate that cancer patients recruited through Internet cancer support groups tended to be middle-aged, well-educated, female, and middle class. The findings also indicate that there were significant differences in some characteristics according to gender and ethnicity. Based on the findings, some implications are suggested for future research using and developing Internet cancer support groups.
CIN: Computers, Informatics, Nursing, 2010
Despite positive reports about Internet cancer support groups, studies have rarely addressed how ... more Despite positive reports about Internet cancer support groups, studies have rarely addressed how to choose an appropriate Internet cancer support group to conduct research. The purpose of this article was to propose evaluation criteria for selecting Internet cancer support groups from which to recruit research participants. The authors developed proposed criteria while conducting an Internet-based study of cancer pain experience among cancer patients recruited through Internet cancer support groups. During recruitment and data collection, the researchers conducted biweekly discussions about recruitment progress and kept detailed records about issues that arose in the process of identifying, contacting, and announcing the study in Internet cancer support groups. Then, the written records were analyzed using content analysis to develop the evaluation criteria. The evaluation criteria developed were (1) private or public domains, (2) mission and purpose of the Internet cancer support group, (3)target users of the Internet cancer support group, (4) scope of the Internet cancer support group, (5) contents of the Internet cancer support group, (6) logistics for study announcements in the Internet cancer support group, (7) dynamics within the Internet cancer support group, and (8) credibility and authenticity of the owner/administrator of the Internet cancer support group. Because these criteria were developed from experiences gained during only one study, further development and refinement of the evaluation criteria are essential.
Bioresource Technology, 2016
The aim of this work was to obtain fermentable sugars by enzymatic or acid hydrolyses of Agave te... more The aim of this work was to obtain fermentable sugars by enzymatic or acid hydrolyses of Agave tequilana Weber bagasse in order to produce succinic acid with Actinobacillus succinogenes. Hydrolyses were carried out with mineral acids (sulfuric and hydrochloric acids) or a commercial cellulolytic enzyme, and were optimized statistically by a response surface methodology, having as factors the concentration of acid/enzyme and time of hydrolysis. The concentration of sugars obtained at optimal conditions for each hydrolysis were 21.7, 22.4y 19.8g/L for H2SO4, HCl and the enzymatic preparation respectively. Concerning succinic acid production, the enzymatic hydrolyzates resulted in the highest yield (0.446g/g) and productivity (0.57g/Lh) using A. succinogenes in a batch reactor system. Repeated batch fermentation with immobilized A. succinogenes in agar and with the enzymatic hydrolyzates resulted in a maximum concentration of succinic acid of 33.6g/L from 87.2g/L monosaccharides after 5 cycles in 40h, obtaining a productivity of 1.32g/Lh.