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1.
Adm Policy Ment Health ; 49(5): 810-820, 2022 09.
Article de Anglais | MEDLINE | ID: mdl-35697977

RÉSUMÉ

This study utilized latent profile analysis to categorize youth served by a public mental health setting into homogenous classes. Then, associations between class membership and meeting clinical criteria by the latest assessment were examined. Caregiver responses to the Ohio Scales, Short Form, Problem Severity Scale for 1090 youth completed at entry into this public mental health system were subjected to latent profile analysis. This method classifies youth into categories based on mental health problem profiles, in order to determine the degree to which these groupings are related to later mental health outcomes. The classification of youth cases that emerged was then used to predict clinical remission at or nearest end of treatment, including final Ohio Scales Problem Severity scores and a measure of day-to-day functioning, the Child and Adolescent Functional Assessment Scale (CAFAS). A four-class model was identified as best representing the data, reflecting a relatively low-risk class (63.3% of the sample), an internalizing class (23.2%), a delinquency class (8.8%), and a high-risk class (4.7%). Individuals in the internalizing and high-risk classes had lower likelihoods of achieving problem remission than those in the low-risk and delinquency classes at the time of their last completed Ohio Scales. Additionally, youth assigned to the delinquency and high-risk classes had lower likelihoods of reaching functional impairment remission than those in the internalizing and low-risk classes. Youth membership in a class based on initial problem scores can be utilized to predict clinical remission over the course of treatment in public mental health care. Such class-based predictions support other methods of predicting outcomes and can be used by clinicians to develop more informed treatment plans and to adjust treatment based on such classifications.


Sujet(s)
Santé mentale , Psychothérapie , Adolescent , Enfant , Humains , Ohio
3.
Eval Health Prof ; 44(3): 279-292, 2021 09.
Article de Anglais | MEDLINE | ID: mdl-32148073

RÉSUMÉ

Identifying practical and effective tools to evaluate the efficacy of cultural competency (cc) training in medicine continues to be a challenge. Multiple measures of various lengths and stages of psychometric testing exist, but none have emerged as a "gold standard." This review attempts to identify cc measures with potential to economically, efficiently, and effectively provide insight regarding the value of cc training efforts to make it easier for wider audience utilization. A scoping review of 11 online reference databases/search engines initially yielded 9,626 items mentioning cc measures. After the initial review, focus was placed on measures that assessed cultural competence of medical students, residents, and/or attending physicians. Six measures were identified and reviewed: (1) Cross-Cultural Care Survey, (2) Cultural Competence Health Practitioner Assessment, (3) Cultural Humility Scale, (4) Health Beliefs Attitudes Survey, (5) Tool for Assessing Cultural Competency Training, and (6) the Tucker-Culturally Sensitive Health-Care Provider Inventory. Relevant literature documenting use and current psychometric assessments for each measure were noted. Each measure was found to be of value for its particular purpose but needs more strenuous reliability and validity testing. A commitment to include psychometric assessments should be an expected part of studies utilizing these measures.


Sujet(s)
Compétence culturelle , Étudiant médecine , Compétence culturelle/enseignement et éducation , Personnel de santé , Humains , Psychométrie , Reproductibilité des résultats
4.
Adm Policy Ment Health ; 46(5): 609-619, 2019 09.
Article de Anglais | MEDLINE | ID: mdl-31152274

RÉSUMÉ

Over the past several years, youth treatment research has moved toward understanding the dissemination and implementation of evidence-based practices (EBPs). As a result, studies have focused on identifying predictors that aid in successful adoption and sustainment of EBPs. Theories of behavior change posit that therapist knowledge and attitudes play a fundamental role in EBP adoption; however, studies have produced mixed findings, which may be an artifact of broad definitions of both EBP knowledge and EBP itself. The current study was an examination of 46 youth community therapists and the extent to which varying types of knowledge and attitudes as well as youth characteristics predicted specific practices derived from the evidence-base. Results suggested that specific EBP knowledge predicted specific practices, highlighting the need for more specificity when examining predictors of EBP use. Therapists' attitudes, demographic characteristics, and youth characteristics were also significant predictors of EBP use. Future research should consider examining discrete and specific practices to better understand and predict therapists' future behavior.


Sujet(s)
Attitude du personnel soignant , Thérapie comportementale/organisation et administration , Services communautaires en santé mentale/organisation et administration , Pratique factuelle/organisation et administration , Connaissances, attitudes et pratiques en santé , Adolescent , Adulte , Sujet âgé , Enfant , Enfant d'âge préscolaire , Femelle , Hawaï , Humains , Mâle , Adulte d'âge moyen , Facteurs socioéconomiques , Jeune adulte
5.
Health Equity ; 1(1): 150-155, 2017.
Article de Anglais | MEDLINE | ID: mdl-30283842

RÉSUMÉ

Purpose: Various tools have been utilized for cultural competency training in residency programs, including cultural standardized patient examinations. However, it is unknown whether residents feel the training they received has a long-term impact on how they care for patients. The purpose of this study was to assess whether surgical residents who participated in a cultural standardized patient examination view the experience as beneficial. Methods: Surgical residents who completed a standardized patient examination from Fall 2009 to Spring 2015 were asked to complete a 13-question survey assessing the following: (1) did participants feel prepared when dealing with patients from different cultural backgrounds, (2) did they feel the standardized patient experience was beneficial or improved their ability to care for patients, and (3) did they perceive that cultural competence was important when dealing with patients. Results: Sixty current/former residents were asked to participate and 24 (40%) completed the survey. All agreed cross-cultural skills were important and almost all reported daily interaction with patients from different cultural backgrounds. Sixteen participants (67%) reported the cultural standardized patient examination aided their ability to care for culturally dissimilar patients, and 13 (54%) said the training helped improve their communication skills with patients. Thirteen (54%) reported they would participate in another cultural standardized patient examination. Conclusion: Development of effective cultural competency training remains challenging. This study provides some preliminary results that demonstrate the potential lasting impact of cultural competency training. Participants found the skills gained from cultural standardized patient examinations helpful.

6.
Adm Policy Ment Health ; 44(1): 141-154, 2017 Jan.
Article de Anglais | MEDLINE | ID: mdl-26459353

RÉSUMÉ

Knowledge of mental health treatment outcome trajectories across various service types can be valuable for both system- and client-level decision-making. Using longitudinal youth functional impairment scores across 2807 treatment episodes, this study examined outcome trajectories and estimated the number of months required for reliable change across nine major services (or levels of care). Results indicate logarithmic improvement trajectories for a majority of levels of care and significant differences in time until improvement ranging from 4 to 12 months. Findings can guide system-level policies on lengths of treatment and service authorizations and provide expected treatment response data for client-level treatment decisions.


Sujet(s)
Services de santé mentale , /tendances , Adolescent , Épisode de soins , Femelle , Humains , Mâle , Troubles mentaux/thérapie , Modèles des risques proportionnels , Résultat thérapeutique
7.
Front Neurosci ; 9: 213, 2015.
Article de Anglais | MEDLINE | ID: mdl-26113808

RÉSUMÉ

Melanocortin receptor accessory proteins (MRAPs) are regulators of the melanocortin receptor family. MRAP is an essential accessory factor for the functional expression of the MC2R/ACTH receptor. The importance of MRAP in adrenal gland physiology is demonstrated by the clinical condition familial glucocorticoid deficiency type 2. The role of its paralog melanocortin-2-receptor accessory protein 2 (MRAP2), which is predominantly expressed in the hypothalamus including the paraventricular nucleus, has recently been linked to mammalian obesity. Whole body deletion and targeted brain specific deletion of the Mrap2 gene result in severe obesity in mice. Interestingly, Mrap2 complete knockout (KO) mice have increased body weight without detectable changes to food intake or energy expenditure. Rare heterozygous variants of MRAP2 have been found in humans with severe, early-onset obesity. In vitro data have shown that Mrap2 interaction with the melanocortin-4-receptor (Mc4r) affects receptor signaling. However, the mechanism by which Mrap2 regulates body weight in vivo is not fully understood and differences between the phenotypes of Mrap2 and Mc4r KO mice may point toward Mc4r independent mechanisms.

8.
Adm Policy Ment Health ; 42(4): 373-83, 2015 Jul.
Article de Anglais | MEDLINE | ID: mdl-25023894

RÉSUMÉ

Practice data from 74 therapists providing public mental health services to 519 youth ages 5-19 were examined. Multilevel modeling suggested child and therapist characteristics predicted use of practices derived from the evidence-base (PDEB) and use of practices with minimal evidence support (PMES). Longer episode length predicted greater receipt of PDEB; older youth, males, and youth in out-of-home levels of care were more likely to receive PMES; and youth receiving an evidence-based treatment program were less likely to receive PMES. Professional specialty and theoretical orientation significantly predicted PDEB whereas therapist characteristics did not predict PMES. Implementation implications are discussed.


Sujet(s)
Services communautaires en santé mentale/statistiques et données numériques , Pratique factuelle/statistiques et données numériques , Troubles mentaux/thérapie , Psychothérapie/statistiques et données numériques , Adolescent , Adulte , Facteurs âges , Enfant , Enfant d'âge préscolaire , Assistance , Thérapie familiale , Femelle , Humains , Mâle , Adulte d'âge moyen , Analyse multiniveaux , , Psychiatrie , Théorie psychologique , Psychologie , Facteurs sexuels , Services sociaux et travail social (activité) , Facteurs temps , Jeune adulte
9.
J Surg Educ ; 71(3): 398-404, 2014.
Article de Anglais | MEDLINE | ID: mdl-24797857

RÉSUMÉ

BACKGROUND: Recent articles have documented the importance of cultural competency in surgery. Surgical residency programs have used the Objective Structured Clinical Examinations or cultural standardized patient examinations as a training tool. Past studies evaluating cultural competency have noted the importance of including an observational (control) arm, which would allow for a more objective assessment of a resident's competency in this area. The purpose of our article is to present the results of a follow-up study to a pilot cultural standardized patient examination for surgery residents. METHODS: All first-year surgery residents were required to participate in the videotaped cultural SP examination as part of the general surgery residency curriculum. Two measures were used to assess resident performance. On the day of the examination, the Cross-Cultural Care Survey was administered. The examination was assessed by the residents themselves, faculty observers, and standardized patients, using a written checklist that was developed to evaluate residents on all 6 Accreditation Council for Graduate Medical Education competencies. RESULTS: The current study includes 20 first-year surgery residents from academic years 2011 to 2012 and 2012 to 2013. The examination of pretest differences in groups found that students born outside of the United States had significantly higher scores on attitude (t = -2.68, df = 18, p = 0.02), but no statistically significant differences were found in skillfulness or knowledge or in the overall rating scale. For the overall rating scale, change from pretest to posttest was statistically significant (t = -2.25, df = 18, p = 0.04). Further analysis revealed that students who were born in the United States demonstrated a significant increase in ratings (t = -3.08, df = 10, p = 0.01) whereas students who were not born in the United States showed little change (t = -0.35, df = 7, p = 0.74). These results show that the means in attitude scales changed little for all groups, but both white and US-born students showed greater improvement on skillfulness and knowledge. CONCLUSIONS: Training and measurement of cross-cultural health care skills remains challenging. However, studies like these provide a good starting point from which to build.


Sujet(s)
Soins adaptés sur le plan culturel , Chirurgie générale/enseignement et éducation , Internat et résidence , Examen physique/normes , Culture (sociologie) , États-Unis , Enregistrement sur bande vidéo
10.
Food Sci Technol Int ; 20(5): 333-9, 2014 Jul.
Article de Anglais | MEDLINE | ID: mdl-23744121

RÉSUMÉ

Frybreads were prepared using wheat flour and wheat-sorghum composite flours (refined and whole grain; white, tannin-free and red, tannin-containing) at 0, 25, 50, and 75% sorghum flour. Hardness, volume, specific volume, color, and oil uptake were determined. Frybreads made with refined white, tannin-free sorghum were also evaluated in a sensory panel. Substitution of sorghum flour for wheat flour reduced the volume and increased the darkness of the fried dough pieces compared with wheat flour controls. Oil absorption was unaffected when using white, tannin-free sorghum. When using red, tannin-containing sorghum, oil absorption increased for refined flour and decreased for whole grain flour, suggesting that a component only present in the whole grain tannin-containing Sorghum--perhaps tannins themselves--may decrease oil uptake. Panelists rated frybreads containing up to 50% white, tannin-free sorghum flour as not significantly different from control frybreads made with refined wheat flour.


Sujet(s)
Pain/analyse , Grains comestibles , Farine , Sorghum/composition chimique , Tanins/analyse , Absorption physico-chimique , Animaux , Comportement du consommateur , Cuisine (activité) , Matières grasses alimentaires insaturées , Humains , Sensation
11.
Hawaii J Med Public Health ; 73(12): 387-92, 2014 Dec.
Article de Anglais | MEDLINE | ID: mdl-25628971

RÉSUMÉ

Project Kealahou (PK) is a six-year, federally-funded program aimed at improving services and outcomes for Hawai'i's female youth who are at risk for running away, truancy, abuse, suicide, arrest and incarceration. PK builds upon two decades of sustained cross-agency efforts among the state's mental health, juvenile justice, education, and child welfare systems to promote system-of-care (SOC) principles of community-based, individualized, culturally and linguistically competent, family driven, youth-guided, and evidence-based services. In addition, PK emphasizes trauma-informed and gender-responsive care in serving its target population of females ages 11-18 years who have experienced psychological trauma. Results from the first four years of the implementation of PK in the Department of Health's (DOH) Child and Adolescent Mental Health Division (CAMHD) highlight the serious familial, socioeconomic, functional, and interpersonal challenges faced by the young women who receive services in Hawai'i's SOC. Despite the challenges faced by PK youth and their families, preliminary results of the evaluation of PK show significant improvements across multiple clinical and functional domains of service recipients. A financial analysis indicates that these outcomes were obtained with a minimal overall increase in costs when compared to standard care alone. Overall, these results suggest that PK may offer a cost effective way to improve access, care, and outcomes for at-risk youth and their families in Hawai'i.


Sujet(s)
Services de santé pour adolescents/organisation et administration , Services de santé pour enfants/organisation et administration , Services de santé communautaires/organisation et administration , Promotion de la santé/organisation et administration , Services de santé mentale/organisation et administration , Populations vulnérables , Adolescent , Prise en charge personnalisée du patient , Enfant , Pratique factuelle , Femelle , Hawaï , Recherche sur les services de santé , Humains , Évaluation des résultats et des processus en soins de santé
12.
Med Teach ; 35(11): 908-14, 2013 Nov.
Article de Anglais | MEDLINE | ID: mdl-23931736

RÉSUMÉ

BACKGROUND: This study was an assessment of the professionalism curriculum at a community-based medical school from the perspective of undergraduate medical students. AIMS: The goal of this study was to ascertain the perspectives of faculty and students on their interpretations of professionalism and its role in medical education to improve and expand existing professionalism curricula. METHOD: An online survey was created and sent to all students (n = 245) and selected faculty (n = 41). The survey utilized multiple choice and open-ended questions to allow responders to provide their insights on the definition of professionalism and detail how professionalism is taught and evaluated at their institution. A content analysis was conducted to categorize open-ended responses and the resulting themes were further examined using SPSS 20.0 for Windows (IBM Corp., Armonk, NY) frequency analyses. RESULTS: Students and faculty respondents were similar in their definitions of medical professionalism and their perceptions of teaching methods. Role modeling was the most common and preferred method of professionalism education. Responses to whether evaluations of professional behavior were effective suggested both students and faculty are unclear about current professionalism assessments. CONCLUSION: This study showed that a cohesive standardized definition of professionalism is needed, as well as clearer guidelines on how professionalism is assessed.


Sujet(s)
Attitude du personnel soignant , Enseignement médical premier cycle/organisation et administration , Corps enseignant et administratif en médecine , Rôle médical , Étudiant médecine , Adulte , Compétence clinique , Programme d'études , Femelle , Humains , Leadership , Apprentissage , Mâle , Mentors , Adulte d'âge moyen
13.
J Agric Food Chem ; 61(18): 4448-54, 2013 May 08.
Article de Anglais | MEDLINE | ID: mdl-23581620

RÉSUMÉ

The purpose of this study was to investigate the effects of tannins on starch digestion in tannin-containing sorghum extracts and wholegrain flours from 12 sorghum varieties. Extracts reduced amylase activity in a tannin concentration-dependent manner when the extract was mixed with the enzyme before substrate (amylopectin) addition, with higher molecular weight tannins showing greater reduction. Conversely, when the extract and substrate were combined before enzyme addition an enhancement in amylase activity was experienced. In uncooked, cooked, and cooked and stored wholegrain sorghum flours, rapidly digestible, slowly digestible, and resistant starches were not correlated with tannin content or molecular weight distribution. Resistant starch increased from 6.5% to 22-26% when tannins were added to starch up to 50% (starch weight). Tannin extracts both reduced and enhanced amylase activity depending on conditions, and, while these trends were clear in extracts, the effects on starch digestion in wholegrain flours was more complex.


Sujet(s)
Farine/analyse , Sorghum/composition chimique , Amidon/composition chimique , Tanins/composition chimique , alpha-Amylases/métabolisme , Amylopectine/composition chimique , Catéchine/composition chimique , Cellulose/composition chimique , Cuisine (activité) , Manipulation des aliments/méthodes , Masse moléculaire , Extraits de plantes/composition chimique
14.
J AOAC Int ; 94(5): 1601-16, 2011.
Article de Anglais | MEDLINE | ID: mdl-22165027

RÉSUMÉ

A rapid, sensitive, and accurate method for the screening and determination of polycyclic aromatic hydrocarbons (PAHs) in edible seafood is described. The method uses quick, easy, cheap, effective, rugged, and safe (QuEChERS)-based extraction and HPLC with fluorescence detection (FLD). The method was developed and validated in response to the massive Deepwater Horizon oil spill in the Gulf of Mexico. Rapid and highly sensitive PAH screening methods are critical tools needed for oil spill response; they help to assess when seafood is safe for harvesting and consumption. Sample preparation involves SPE of edible seafood portions with acetonitrile, followed by the addition of salts to induce water partitioning. After centrifugation, a portion of the acetonitrile layer is filtered prior to analysis via HPLC-FLD. The chromatographic method uses a polymeric C18 stationary phase designed for PAH analysis with gradient elution, and it resolves 15 U.S. Environmental Protection Agency priority parent PAHs in fewer than 20 min. The procedure was validated in three laboratories for the parent PAHs using spike recovery experiments at PAH fortification levels ranging from 25 to 10 000 microg/kg in oysters, shrimp, crab, and finfish, with recoveries ranging from 78 to 99%. Additional validation was conducted for a series of alkylated homologs of naphthalene, dibenzothiophene, and phenanthrene, with recoveries ranging from 87 to 128%. Method accuracy was further assessed based on analysis of National Institute of Standards and Technology Standard Reference Material 1974b. The method provides method detection limits in the sub to low ppb (microg/kg) range, and practical LOQs in the low ppb (microg/kg) range for most of the PAH compounds studied.


Sujet(s)
Hydrocarbures aromatiques polycycliques/analyse , Produits de la mer/analyse , Alkylation , Animaux , Calibrage , Chromatographie en phase liquide à haute performance , Poissons , Chromatographie gazeuse-spectrométrie de masse , Indicateurs et réactifs , Limite de détection , Pollution pétrolière , Normes de référence , Reproductibilité des résultats , Fruits de mer , Spectrométrie de fluorescence , États-Unis , Environmental Protection Agency (USA)
15.
Hawaii Med J ; 69(12): 289-93, 2010 Dec.
Article de Anglais | MEDLINE | ID: mdl-21225585

RÉSUMÉ

The need for physicians formally trained to deliver care to diverse patient populations has been widely advocated. Utilizing a validated tool, Weissman and Betancourt's Cross-Cultural Care Survey, the aim of this current study was to compare surgery and family medicine residents' perceptions of their preparedness and skillfulness to provide high quality cross-cultural care. Past research has documented differences between the two groups' reported impressions of importance and level of instruction received in cross-cultural care. Twenty surgery and 15 family medicine residents participated in the study. Significant differences were found between surgery and family medicine residents on most ratings of the amount of training they received in cross-cultural skills. Specifically, family medicine residents reported having received more training on: 1) determining how patients want to be addressed, 2) taking a social history, 3) assessing their understanding of the cause of illness, 4) negotiating their treatment plan, 5) assessing whether they are mistrustful of the health care system and÷or doctor, 6) identifying cultural customs, 7) identifying how patients make decisions within the family, and 8) delivering services through a medical interpreter. One unexpected finding was that surgery residents, who reported not receiving much formal cultural training, reported higher mean scores on perceived skillfulness (i.e. ability) than family medicine residents. The disconnect may be linked to the family medicine residents' training in cultural humility - more knowledge and understanding of cross-cultural care can paradoxically lead to perceptions of being less prepared or skillful in this area.


Sujet(s)
Attitude du personnel soignant , Compétence culturelle , Médecine de famille/enseignement et éducation , Internat et résidence/organisation et administration , Procédures de chirurgie opératoire/enseignement et éducation , Diversité culturelle , Femelle , Humains , Mâle
16.
Int J Surg ; 7(4): 368-72, 2009 Aug.
Article de Anglais | MEDLINE | ID: mdl-19527802

RÉSUMÉ

In response to the growing diversity of the United States population and concerns with health disparities, formal training in cross-cultural care has become mandatory for all medical specialties, including surgery. The aim of this study was to assess the readiness of a general surgery residency program to incorporate cultural competency initiatives into its curriculum. Eighteen surgical teaching faculty (at a community-based hospital with a university affiliation) voluntarily participated in a qualitative study to share their views on cultural competency and to discuss ways that it could potentially be incorporated into the curriculum. Reflective of current definitions of cultural competency, faculty viewed the term culture broadly (i.e., beyond race and ethnicity). Suggested instructional methods varied, with some noting that exposure to different cultures was helpful. Others stated the importance of faculty serving as role models. Most faculty in this study appear open to cultural training, but desire a clear understanding of what that would entail and how it can be taught. They also acknowledged the lack of time to address cultural issues. Taking into consideration these and other concerns, planned curricular interventions are also presented.


Sujet(s)
Compétence clinique , Compétence culturelle/organisation et administration , Diversité culturelle , Chirurgie générale/enseignement et éducation , Internat et résidence/organisation et administration , Programme d'études , Enseignement spécialisé en médecine/organisation et administration , Corps enseignant et administratif en médecine , Femelle , Humains , Mâle , Évaluation de programme , Enquêtes et questionnaires , États-Unis
17.
Adv Food Nutr Res ; 55: 221-68, 2009.
Article de Anglais | MEDLINE | ID: mdl-18772106

RÉSUMÉ

Starch occurs as highly organized structures, known as starch granules. Starch has unique thermal properties and functionality that have permitted its wide use in food products and industrial applications. When heated in water, starch undergoes a transition process, during which the granules break down into a mixture of polymers-in-solution, known as gelatinization. The sequence of structural transformations that the starch granule undergoes during this order-to-disorder transition has been extensively researched. None of the published starch gelatinization theories can fully and adequately explain the exact mechanism of sequential structural changes that starch granules undergo during gelatinization. This chapter analyzes several published theories and summarizes our current understanding of the starch gelatinization process.


Sujet(s)
Chimie physique , Gels/composition chimique , Amidon/composition chimique , Eau/composition chimique , Phénomènes chimiques , Cristallisation , Propriétés de surface , Température
18.
Hawaii Med J ; 67(11): 294-300, 302, 2008 Nov.
Article de Anglais | MEDLINE | ID: mdl-19226910

RÉSUMÉ

Methamphetamine use continues to be a significant problem for adolescents in Hawai'i, especially among Native Hawaiians and other Asian and Pacific Islanders. However, no research has compared the unique characteristics of these methamphetamine (MA) users to other substance users, which could contribute to enhanced treatment approaches. Utilizing a sample of adolescent treatment clients, this study compared those who have ever used and those who have never used methamphetamines on various domains. Results showed that girls were significantly more likely to use methamphetamines than other substances. Native Hawaiians and other Pacific Islanders were more likely to use methamphetamines as well, although the difference was not statistically significant. MA users reported significantly more homelessness and prior treatment episodes. While no differences were found in arrest rates or days in jail/prison/juvenile detention in the past 90 days, MA users scored significantly higher on all self-reported crime indices. MA users also scored significantly higher on all substance problem and mental health indices, and reported significantly poorer health. Implications for future research and treatment are discussed.


Sujet(s)
Comportement de l'adolescent , Troubles liés aux amphétamines/épidémiologie , Métamfétamine , Adolescent , Facteurs âges , Femelle , Hawaï/épidémiologie , Humains , Mâle , Psychométrie , Facteurs de risque
19.
J Agric Food Chem ; 55(26): 10751-63, 2007 Dec 26.
Article de Anglais | MEDLINE | ID: mdl-18020414

RÉSUMÉ

A corroborative study was conducted on the maize quality properties of test weight, pycnometer density, tangential abrasive dehulling device (TADD), time-to-grind on the Stenvert hardness tester (SHT), 100-kernel weight, kernel size distribution, and proximate composition as well as maize dry- and wet-millability by six participating laboratories. Suggested operating procedures were given to compare their measurements and provide the variance structure within and between laboratories and hybrids. Partial correlation coefficient among maize quality properties varied among laboratories. The repeatability and reproducibility precision values were acceptably low for the physical quality tests, except for TADD and SHT time-to-grind measurements. The yields of dry- and wet-milled products and their correlation with maize quality properties were dependent on the collaborating laboratory. This paper highlights the importance of laboratory variation when considering which maize hybrids are best suited for dry-milling and wet-milling.


Sujet(s)
Manipulation des aliments/méthodes , Zea mays , Hybridation génétique , Contrôle de qualité , Reproductibilité des résultats , Graines , Zea mays/anatomie et histologie , Zea mays/composition chimique , Zea mays/génétique
20.
J Forensic Sci ; 51(4): 827-31, 2006 Jul.
Article de Anglais | MEDLINE | ID: mdl-16882227

RÉSUMÉ

Bleach (sodium hypochlorite) has been identified as the adulterant in a relatively large number of product tamperings that have been investigated by the Forensic Chemistry Center (FCC) of the U.S. Food and Drug Administration. In this work, household bleach was added to 23 different beverages at each of three levels. The impact of sodium hypochlorite on these beverages over a 13-day study period was evaluated using the following techniques: diphenylamine spot test for oxidizing agents, potassium iodide-starch test paper for oxidizing agents, pH, iodometric titration for quantitating hypochlorite, ion chromatography for chloride and chlorate quantitation, automated headspace sampling with gas chromatography-flame ionization detection (GC-FID) for determination of chloroform, and visual and organoleptic observations. This study has shown that hypochlorite is fragile when added to most common beverages and typically breaks down either partially or completely over time. In cases where a beverage is suspected of being adulterated with bleach but tests for hypochlorite are negative, it is still possible to characterize the product to demonstrate that the results are consistent with the addition of bleach. An adulterated product will give a positive test for oxidizing agents using the diphenylamine spot test. It is likely that the pH of the adulterated product will be higher than a control of that product. Ion chromatographic analysis shows elevated chloride and chlorate as compared with a control. And, chloroform may also be detected by GC-FID especially if the beverage that was adulterated contains citric acid.


Sujet(s)
Boissons/analyse , Désinfectants/intoxication , Contamination des aliments , Médecine légale/méthodes , Hypochlorite de sodium/intoxication , Chromatographie d'échange d'ions , Désinfectants/composition chimique , Ionisation de flamme , Concentration en ions d'hydrogène , Hypochlorite de sodium/composition chimique
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