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1.
J Spec Oper Med ; 2024 Mar 13.
Artículo en Inglés | MEDLINE | ID: mdl-38319637

RESUMEN

Building upon our strategic framework and operational model, we will discuss findings from our ethnographic study, entitled: "The Impact of Catastrophic Injury Exposure on Resilience in Special Operations Surgical Teams (SOSTs)," to explain the tactical nature and importance of social determinants within our new characterization of unconventional resilience. Our fourth paper in this series, will explain how bonding patterns establish the quality of intra- and interpersonal connections that create a tensive conduit for the pressure of performance within our operational model, allowing for dynamic freedom of maneuver to take place in ambiguity. We will use qualita- tive quotes to illustrate various ways SOST medics relate to themselves, other people, and the Special Operations Forces (SOF) culture. To achieve our goals, we will: 1) provide an in- troduction to social determinants as tactical engagement with unconventional resilience; 2) define the social determinant of bonding patterns as extrapolated from qualitative data as well as use qualitative data to thematize various types of bonding patterns; and 3) relate tactical engagement with bonding pat- terns to our metaphor of bag sets. We conclude by gesturing to the importance of bonding patterns in orienting SOF medics' proprioception and kinesthesia in the SOF performance space.

2.
J Spec Oper Med ; 24(2): 103-108, 2024 Jun 25.
Artículo en Inglés | MEDLINE | ID: mdl-38109230

RESUMEN

Building upon our operational model, we will discuss findings from our ethnographic study titled "The Impact of Catastrophic Injury Exposure on Resilience in Special Operations Surgical Teams" to establish that impression management allows Special Operation Forces (SOF) medics to navigate implicit social status symbols to either degrade or optimize performance. We will use qualitative quotes to explore how Special Operations Surgical Team (SOST) medics engage in impression management to establish individual, team, and/or organizational competency to deal with ambiguity. To achieve our goals, we will: 1) provide a background on impression management and perception of competency; 2) define the social determinant of impression management extrapolated from qualitative data as well as use qualitative data to thematize various types of impression management; and 3) relate tactical engagement with impression to our metaphor of bag sets. We conclude by gesturing to the importance of impression management in orienting SOF medics' proprioception and kinesthesia in the SOF performance space.


Asunto(s)
Personal Militar , Humanos , Personal Militar/psicología , Resiliencia Psicológica
3.
J Spec Oper Med ; 23(4): 64-68, 2023 Dec 29.
Artículo en Inglés | MEDLINE | ID: mdl-37972384

RESUMEN

This is the third of nine planned papers drawn from the findings of our ethnographic study entitled "The Impact of Catastrophic Injury Exposure on Resilience in Special Operations Surgical Teams." Building from our strategic framework, this paper will establish that resilience is better understood as cohesive adaptation within a Special Operation Forces (SOF) cultural ecosystem. Exploring unconventional resilience as the inter-relationship across the organization, team, and individual, we will use qualitative quotes to describe the ecosystem of dynamic freedom of maneuver in ambiguity. To achieve our goals, we will: 1) compare conventional and unconventional resilience to operationalize the components of our strategic framework; 2) use qualitative quotes to show how the ecosystem of unconventional resilience functions at each level supporting our operational model; and 3) describe how the operational model of unconventional resilience links to tactical performance through five social determinants. We conclude by gesturing to how transformational change-agency applies to practical performance of all SOF medics.


Asunto(s)
Personal Militar , Resiliencia Psicológica , Humanos
4.
Mil Med ; 188(Suppl 6): 110-115, 2023 11 08.
Artículo en Inglés | MEDLINE | ID: mdl-37948215

RESUMEN

INTRODUCTION: Clinical documentation is an essential component of the provision of medical care, enabling continuity of information across provider and site handoffs. This is particularly important in the combat casualty care setting when a single casualty may be treated by four or more or five completely disparate teams across the roles of care. The Battlefield Assisted Trauma Distributed Observation Kit (BATDOK) is a digital battlefield clinical documentation system developed by the Air Force Research Laboratory to address this need. To support the deployment of this tool, we integrated BATDOK into a commercially available virtual reality (VR) medical simulation platform used by the U.S. Air Force and Defense Health Agency personnel in order to provide an immersive simulation training experience which included battlefield documentation. METHODS: A multidisciplinary team consisting of medical educators, VR simulation engineers, emergency physicians and pararescuemen, and BATDOK developers first developed a specification for a virtual BATDOK capability, including a detailed listing of learning objectives, critical interfaces and task plans, and sensor integrations. These specifications were then implemented into the commercially available Virtual Advancement of Learning for Operational Readiness VR Medical Simulation System and underwent developmental testing and evaluation during pararescueman training exercises at the Air Force Special Operations Command Special Operations Center for Medical Integration and Development. RESULTS AND CONCLUSIONS: The BATDOK capability was successfully implemented within the VR Medical Simulation System. The capability consisted of a virtual tablet with replicated interfaces and capabilities based on the developed specifications. These capabilities included integrated point-of-care ultrasound capability, multi-patient management, vitals sign monitoring with sensor pairing and continuous monitoring, mechanism of injury documentation (including injury pattern documentation), intervention logging (including tourniquets, dressing, airways, lines, tubes and drains, splints, fluids, and medications), and event logging. The capability was found to be operational and in alignment with learning objectives and user acceptance goals.


Asunto(s)
Entrenamiento Simulado , Realidad Virtual , Humanos , Simulación por Computador , Torniquetes
5.
J Trauma Acute Care Surg ; 95(2S Suppl 1): S19-S25, 2023 08 01.
Artículo en Inglés | MEDLINE | ID: mdl-37184467

RESUMEN

BACKGROUND: At the University of Alabama at Birmingham (UAB), a multi-tiered military-civilian partnership (MCP) has evolved since 2006. We aimed to outline this model to facilitate potential replication nationally. METHODS: We performed a comprehensive review of the partnership between UAB, the United States Air Force Special Operations Command, and the Department of Defense (DoD) reviewing key documents and conducting interviews with providers. As a purely descriptive study, this project did not involve any patient data acquisition or analysis and therefore was exempt from institutional review board approval per institutional policy. RESULTS: At the time of this review, six core programs existed targeting training, clinical proficiency, and research. Training: (1) The Special Operations Center for Medical Integration and Development trains up to 144 combat medics yearly. (2) UAB trains one integrated military Surgery resident yearly with two additional civilian-sponsored military residents in Emergency Medicine. (3) UAB's Surgical Critical Care Fellowship had one National Guard member with two incoming Active-Duty, one Reservist and one prior service member in August 2022. Clinical Proficiency: (4) UAB hosts four permanently assigned United States Air Force Special Operations Command Special Operations Surgical Teams composed of general surgeons, anesthesiologists, certified registered nurse anesthetists, surgical technologists, emergency physicians, critical care registered nurses, and respiratory therapists totaling 24 permanently assigned active-duty health care professionals. (5) In addition, two fellowship-trained Air Force Trauma Critical Care Surgeons, one Active-Duty and one Reservist, are permanently assigned to UAB. These clinicians participate fully and independently in the routine care of patients alongside their civilian counterparts. Research: (6) UAB's Division of Trauma and Acute Care Surgery is currently conducting nine DoD-funded research projects totaling $6,482,790, and four research projects with military relevance funded by other agencies totaling $15,357,191. CONCLUSION: The collaboration between UAB and various elements within the DoD illustrates a comprehensive approach to MCP. Replicating appropriate components of this model nationally may aid in the development of a truly integrated trauma system best prepared for the challenges of the future. LEVEL OF EVIDENCE: Economic and Value-based Evaluations; Level IV.


Asunto(s)
Personal Militar , Cirujanos , Humanos , Estados Unidos , Cuidados Críticos , Personal de Salud , Técnicos Medios en Salud
6.
J Spec Oper Med ; 23(3): 58-62, 2023 Oct 05.
Artículo en Inglés | MEDLINE | ID: mdl-37169526

RESUMEN

This will be the second in a series of nine articles in which we discuss findings from our ethnographic study entitled "The Impact of Catastrophic Injury Exposure on Resilience in Special Operations Surgical Teams." Our goal in this article is to establish the practical importance of redefining resilience within a strategic framework. Our bottom-up approach to strategy development explores unconventional resilience as an integrated transformational process that promotes change-agency through the force of movement. Synthesis of empirical data derived from participant interviews and focus groups highlights conceptual attributes that make up the essential components of this framework. To achieve our goal, the authors (1) briefly remind readers how we have problematized conventional resilience; (2) explain how we analyzed qualitative quotes to extrapolate our definition of unconventional resilience; and (3) describe in detail our strategic framework. We conclude by gesturing to why this strategic framework is applicable to practical performance of all Special Operation Forces (SOF) medics.

7.
J Spec Oper Med ; 23(2): 102-106, 2023 Jun 23.
Artículo en Inglés | MEDLINE | ID: mdl-37169528

RESUMEN

This article presents a justification for using an ethnographic approach to research resilience. Our hypothesis is that the conventional resilience construct is ineffective in achieving its stated goal of mitigating diagnosable stress pathologies because it is grounded in a set of assumptions that overlook human experience when examining human performance in combat. To achieve this goal, we (1) describe the evolution of the strategic framework within which the conventional resilience construct is defined; (2) highlight certain limiting assumptions entailed in this framework; (3) explain how bottom-up ethnographic research relates the medic's practical performance to military requirements and mission capabilities; and (4) articulate the unique elements of our study that widen the aperture of the conventional resilience construct. We conclude by gesturing to initial research findings.


Asunto(s)
Personal Militar , Resiliencia Psicológica , Heridas y Lesiones , Humanos , Heridas y Lesiones/psicología
8.
J Spec Oper Med ; 21(2): 25-28, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34105117

RESUMEN

There are limited options available to the combat medic for management of traumatic brain injury (TBI) with impending or ongoing herniation. Current pararescue and Tactical Combat Casualty Care (TCCC) guidelines prescribe a bolus of 3% or 5% hypertonic saline. However, this fluid bears a tactical burden of weight (~570g) and pack volume (~500cm3). Thus, 23.4% hypertonic saline is an attractive option, because it has a lighter weight (80g) and pack volume (55cm3), and it provides a similar osmotic load per dose. Current literature supports the use of 23.4% hypertonic saline in the management of acute TBI, and evidence indicates that it is safe to administer via peripheral and intraosseous cannulas. Current combat medic TBI treatment algorithms should be updated to include the use of 23.4% hypertonic saline as an alternative to 3% and 5% solutions, given its effectiveness and tactical advantages.


Asunto(s)
Lesiones Traumáticas del Encéfalo , Lesiones Encefálicas , Lesiones Traumáticas del Encéfalo/complicaciones , Lesiones Traumáticas del Encéfalo/terapia , Humanos , Solución Salina Hipertónica/uso terapéutico
9.
J Spec Oper Med ; 21(1): 25-29, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33721302

RESUMEN

BACKGROUND: The Air Force Special Warfare Medical Officer Course was created to address the lack of operationally focused, job-specific clinical training for medical officers (MOs). This course addresses the gap in knowledge, skill, and application of operational medicine, as well as the behavioral health, human performance, education, and medical oversight of Operators. METHODS: The course was designed around the senior author's decade of experience piecing together training for his own role as a pararescue flight surgeon and informed by 5 years of flight surgeon courses, lessons learned from case studies of ill-prepared deployed physicians, and input from prehospital medicine subject matter experts. RESULTS: Air Force pararescue and special tactics flight surgeons, physician assistants, and an independent duty medical technician (IDMT) attended. The course consisted of 10 full weekdays of didactics and skills sessions covering theory and application of operational medicine, human performance optimization, behavioral health for Operators, adult education theory, principles of prehospital clinical oversight, and other expeditionary concepts. The course culminated with combat casualty care scenario-based exercises, in which the providers performed operational medicine in full kit with weapons and simulation rounds. DISCUSSION: For many logistical and practical reasons, civilian medical experience, traditional military medical training, existing special operations medical courses, and "merit badge" card classes are not adequate preparation for this specialized role. Focused, job-specific training should be provided to Special Operations Forces Medical Officers (SOFMO) and, ultimately, to any MO deploying in support of medics or combatants. The goal is to maximize the success of military medical operations while reducing the morbidity and mortality of combat and training casualties. CONCLUSION: This operationally focused MO course can serve as a model for the future training of SOFMO and has stimulated discussion for consideration of a joint approach to prehospital medical training.


Asunto(s)
Medicina Militar , Personal Militar , Personal de Salud , Humanos , Guerra
10.
J Spec Oper Med ; 20(3): 122-127, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32969017

RESUMEN

BACKGROUND: US Air Force (USAF) pararescuemen (PJs) perform long-range ocean rescue missions for ill or injured civilians when advanced care and transport are not available. The purpose of this case series is to examine the details of these missions, review patient treatments and outcomes, and describe common tactics, techniques, and procedures for these missions. METHODS: Cases in which the USAF PJs preformed long-range ocean rescue for critically ill or injured civilians between 2011 and 2018 were identified. Case information was obtained, including patient demographics, location, infiltration/exfiltration methods, diagnoses, treatments, duration of patient care, patient outcome, and lessons learned. RESULTS: A total of 14 pararescue missions involving 22 civilians were identified for analysis. Of the 22 patients, 10 (45%) suffered burns, six (27%) had abdominal issues, four (18%) had musculoskeletal injuries, one had a traumatic brain injury, and one had a necrotizing soft-tissue infection. Medical care of these patients included intravenous fluid and blood product resuscitation, antibiotics, analgesics, airway management, and escharotomy. The median duration of patient care was 51 hours. CONCLUSION: This case series illustrates the complex transportation requirements, patient and gear logistical challenges, austere medicine, and prolonged field care (PFC) unique to USAF PJ open-water response.


Asunto(s)
Ambulancias Aéreas , Personal Militar , Lesiones Traumáticas del Encéfalo , Quemaduras , Humanos , Océanos y Mares , Resucitación
11.
Neuron ; 86(3): 665-71, 2015 May 06.
Artículo en Inglés | MEDLINE | ID: mdl-25950634

RESUMEN

Defining the molecular targets of insecticides is crucial for assessing their selectivity and potential impact on environment and health. Two commercial insecticides are now shown to target a transient receptor potential (TRP) ion channel complex that is unique to insect stretch receptor cells. Pymetrozine and pyrifluquinazon disturbed Drosophila coordination and hearing by acting on chordotonal stretch receptor neurons. This action required the two TRPs Nanchung (Nan) and Inactive (Iav), which co-occur exclusively within these cells. Nan and Iav together sufficed to confer cellular insecticide responses in vivo and in vitro, and the two insecticides were identified as specific agonists of Nan-Iav complexes that, by promoting cellular calcium influx, silence the stretch receptor cells. This establishes TRPs as insecticide targets and defines specific agonists of insect TRPs. It also shows that TRPs can render insecticides cell-type selective and puts forward TRP targets to reduce side effects on non-target species.


Asunto(s)
Proteínas de Drosophila/efectos de los fármacos , Canales Iónicos/efectos de los fármacos , Mecanorreceptores/efectos de los fármacos , Plaguicidas/farmacología , Quinazolinonas/farmacología , Canales de Potencial de Receptor Transitorio/efectos de los fármacos , Triazinas/farmacología , Estimulación Acústica , Potenciales de Acción/efectos de los fármacos , Potenciales de Acción/genética , Animales , Animales Modificados Genéticamente , Antenas de Artrópodos/citología , Células CHO , Cricetulus , Drosophila , Proteínas de Drosophila/genética , Proteínas de Drosophila/metabolismo , Sensación de Gravedad/efectos de los fármacos , Sensación de Gravedad/genética , Canales Iónicos/genética , Canales Iónicos/metabolismo , Larva , Mecanorreceptores/fisiología , Movimiento/efectos de los fármacos , Neuronas/efectos de los fármacos , Factores de Transcripción/genética , Factores de Transcripción/metabolismo , Canales de Potencial de Receptor Transitorio/genética
12.
Prim Care ; 41(1): 133-49, 2014 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-24439887

RESUMEN

Although patients with Bell palsy and trigeminal neuralgia occasionally present to primary care physicians, most of the syndromes in this article are somewhat rare in primary care practice. It is important to recognize signs and symptoms of these syndromes so that appropriate management is carried out. Patients may experience sensory and/or motor symptoms of the head and neck due to disorders of the cranial and cervical nerves. The syndromes and symptoms discussed in this article include ear pain, sinus pain, herpes zoster (HZ) oticus (Ramsay Hunt), HZ ophthalmicus, facial nerve paralysis in adults and children, superior laryngeal neuralgia, trigeminal neuralgia, glossopharyngeal neuralgia, nervus intermedius (geniculate) neuralgia, and Raeder paratrigeminal syndrome.


Asunto(s)
Parálisis de Bell/diagnóstico , Enfermedades del Oído/etiología , Herpes Zóster Ótico/diagnóstico , Dolor/etiología , Neuralgia del Trigémino/diagnóstico , Diagnóstico Diferencial , Oído/inervación , Herpes Zóster Ótico/complicaciones , Humanos
13.
Am Fam Physician ; 87(2): 114-20, 2013 Jan 15.
Artículo en Inglés | MEDLINE | ID: mdl-23317075

RESUMEN

Corneal abrasions are commonly encountered in primary care. Patients typically present with a history of trauma and symptoms of foreign body sensation, tearing, and sensitivity to light. History and physical examination should exclude serious causes of eye pain, including penetrating injury, infective keratitis, and corneal ulcers. After fluorescein staining of the cornea, an abrasion will appear yellow under normal light and green in cobalt blue light. Physicians should carefully examine for foreign bodies and remove them, if present. The goals of treatment include pain control, prevention of infection, and healing. Pain relief may be achieved with topical nonsteroidal anti-inflammatory drugs or oral analgesics. Evidence does not support the use of topical cycloplegics for uncomplicated corneal abrasions. Patching is not recommended because it does not improve pain and has the potential to delay healing. Although evidence is lacking, topical antibiotics are commonly prescribed to prevent bacterial superinfection. Contact lens-related abrasions should be treated with antipseudomonal topical antibiotics. Follow-up may not be necessary for patients with small (4 mm or less), uncomplicated abrasions; normal vision; and resolving symptoms. All other patients should be reevaluated in 24 hours. Referral is indicated for any patient with symptoms that do not improve or that worsen, a corneal infiltrate or ulcer, significant vision loss, or a penetrating eye injury.


Asunto(s)
Lesiones de la Cornea , Analgésicos/administración & dosificación , Analgésicos/uso terapéutico , Profilaxis Antibiótica , Vendajes/efectos adversos , Lentes de Contacto/efectos adversos , Diagnóstico Diferencial , Cuerpos Extraños en el Ojo/diagnóstico , Lesiones Oculares/diagnóstico , Lesiones Oculares/terapia , Fluoresceína , Colorantes Fluorescentes , Humanos , Heridas Penetrantes/diagnóstico
15.
Fam Med ; 36(5): 316-8, 2004 May.
Artículo en Inglés | MEDLINE | ID: mdl-15129375

RESUMEN

We have adapted "academic detailing" as a method to deliver real-time faculty development to nearly all community preceptors, both rural and urban, using the RAFT technique (Rapport-building, Assessment, Focused preceptor development, Thanks/Trinkets). The method is expensive in terms of faculty time and can be difficult to schedule. However, it has proven to be a valuable, learner-centered method that reaches preceptors missed by traditional faculty development workshops. Preceptors experience support, both student and preceptor problems are identified and addressed early, and academic faculty gain a better understanding of the preceptor environment.


Asunto(s)
Prácticas Clínicas , Educación Médica Continua/métodos , Medicina Familiar y Comunitaria/educación , Preceptoría , Desarrollo de Personal/métodos , Humanos , Estados Unidos
16.
Am J Clin Nutr ; 79(6): 1053-9, 2004 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-15159236

RESUMEN

BACKGROUND: Identification of allelic variants in a single gene that determine the phytate content of maize kernels and the subsequent breeding of low-phytate maize have facilitated studies designed to determine quantitatively the effects of maize phytate on the bioavailability of minerals in maize. OBJECTIVE: The objective was to determine the relation between the fractional absorption of zinc (FAZ) and the phytate content and phytate:zinc molar ratios of maize tortillas prepared from hybrids with different phytate contents. DESIGN: Six healthy adults were fed, as the only food for 2 d, maize tortillas prepared from 1 of 2 low-phytate mutants: lpa1-1 (lpa1-1-LP) or Nutridense Low Phytate (ND-LP), which have phytate reductions of approximately 60% and approximately 80%, respectively, compared with their respective wild-type isohybrids. Four additional subjects were fed tortillas prepared from the corresponding wild-type isohybrids (lpa1-1-WT and ND-WT) according to the same study design. Meals were extrinsically labeled with zinc stable isotopes, and FAZ was determined with a dual-isotope-tracer ratio technique. Overall FAZ values were examined in relation to dietary phytate and phytate:zinc molar ratios by using a mixed nonlinear regression model. RESULTS: The mean (+/-SD) FAZ values from tortillas prepared from ND-LP, lpa1-1-LP, lpa1-1-WT, and ND-WT were 0.38 +/- 0.07, 0.28 +/- 0.04, 0.15 +/- 0.07, and 0.13 +/- 0.05, respectively. A negative relation (P < 0.001) was found between FAZ and both dietary phytate and the phytate:zinc molar ratio. The effect of dietary zinc (8-14 mg Zn/d) under these experimental conditions was not significant. CONCLUSIONS: FAZ from maize tortillas is positively related to the extent of phytate reduction achieved with low-phytate hybrids.


Asunto(s)
Dieta , Ácido Fítico/farmacología , Zea mays/genética , Zinc/farmacocinética , Adulto , Disponibilidad Biológica , Femenino , Humanos , Absorción Intestinal , Masculino , Ácido Fítico/administración & dosificación , Zinc/administración & dosificación , Isótopos de Zinc/farmacocinética
17.
Phytochemistry ; 62(5): 691-706, 2003 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-12620321

RESUMEN

myo-Inositol-1,2,3,4,5,6-hexakisphosphate (Ins P(6) or "phytic acid") typically represents approximately 75% of the total phosphorus and >80% of soluble myo-inositol (Ins) phosphates in seeds. The seed phosphorus and Ins phosphate phenotypes of four non-lethal barley (Hordeum vulgare L.) low phytic acid mutations are described. In seeds homozygous for M 635 and M 955 reductions in Ins P(6), approximately 75 and >90% respectively, are accompanied by reductions in other Ins phosphates and molar-equivalent increases in Pi. This phenotype suggests a block in supply of substrate Ins. In seeds homozygous for barley low phytic acid 1-1 (lpa1-1), a 45% decrease in Ins P(6) is mostly matched by an increase in Pi but also accompanied by small increases in Ins(1,2,3,4,6)P(5). In seeds homozygous for barley lpa2-1, reductions in seed Ins P(6) are accompanied by increases in both Pi and in several Ins phosphates, a phenotype that suggests a lesion in Ins phosphate metabolism, rather than Ins supply. The increased Ins phosphates in barley lpa2-1 seed are: Ins(1,2,3,4,6)P(5); Ins(1,2,4,6)P(4) and/or its enantiomer Ins(2,3,4,6)P(4); Ins(1,2,3,4)P(4) and/or its enantiomer Ins(1,2,3,6)P(4); Ins(1,2,6)P(3) and/or its enantiomer Ins(2,3,4)P(3); Ins(1,5,6)P(3) and/or its enantiomer Ins(3,4,5)P(3) (the methods used here cannot distinguish between enantiomers). This primarily "5-OH" series of Ins phosphates differs from the "1-/3-OH" series observed at elevated levels in seed of the maize lpa2 genotype, but previous chromosomal mapping data indicated that the maize and barley lpa2 loci might be orthologs of a single ancestral gene. Therefore one hypothesis that might explain the differing lpa2 phenotypes is that their common ancestral gene encodes a multi-functional, Ins phosphate kinase with both "1-/-3-" and "5-kinase" activities. A putative pyrophosphate-containing Ins phosphate, possibly an Ins P(7), was also observed in the mature seed of all barley genotypes except lpa2-1. Barley M 955 indicates that at least for this species, the ability to accumulate Ins P(6) can be nearly abolished while retaining at least short-term ( approximately 1.0 years) viability.


Asunto(s)
Hordeum/genética , Fosfatos de Inositol/metabolismo , Fósforo/análisis , Ácido Fítico/biosíntesis , Semillas/genética , Semillas/metabolismo , Cromatografía Líquida de Alta Presión , Genotipo , Hordeum/química , Hordeum/metabolismo , Fosfatos de Inositol/química , Fosfatos de Inositol/genética , Mutación , Resonancia Magnética Nuclear Biomolecular , Fenotipo , Semillas/química , Semillas/crecimiento & desarrollo , Estereoisomerismo , Zea mays/química , Zea mays/genética , Zea mays/metabolismo
18.
Am J Clin Nutr ; 76(3): 556-9, 2002 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-12197999

RESUMEN

BACKGROUND: Phytic acid reduction in cereal grains has been accomplished with plant genetic techniques. These low-phytic acid grains provide a strategy for improving the mineral (eg, zinc) status in populations that are dependent on grains, including maize (Zea mays L.), as major dietary staples. OBJECTIVE: The objective was to compare the fractional absorption of zinc from polenta prepared from maize low in phytic acid with that prepared from a wild-type isohybrid maize (control) after short-term consumption by adults whose habitual diet is low in phytic acid. DESIGN: Healthy adults served as their own control subjects in a crossover design. All meals on 1 d consisted of polenta prepared from a low-phytic acid maize homozygous for the recessive low phytic acid 1-1 (lpa1-1). On the preceding or following day, all meals consisted of polenta prepared from a sibling isohybrid homozygous wild-type maize with a "normal" phytic acid content. The low-phytic acid maize contained approximately 60% less phytic acid than did the wild-type maize. All test meals were extrinsically labeled with zinc stable-isotope tracers. The fractional absorption of zinc was determined on the basis of fecal enrichment. RESULTS: The molar ratios of phytic acid to zinc in the polenta prepared from lpa1-1 maize and the wild-type maize were 17:1 and 36:1, respectively. The corresponding fractional absorptions of zinc were 0.30 +/- 0.13 and 0.17 +/- 0.11, respectively (P < 0.005). CONCLUSION: Substitution of a low-phytic acid grain in a maize-based diet is associated with a substantial increase in zinc absorption.


Asunto(s)
Dieta , Ácido Fítico/análisis , Zea mays/química , Zinc/farmacocinética , Absorción , Adulto , Disponibilidad Biológica , Estudios Cruzados , Heces/química , Femenino , Ingeniería Genética , Humanos , Masculino , Zea mays/genética , Zinc/administración & dosificación , Isótopos de Zinc
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