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1.
Molecules ; 26(21)2021 Oct 20.
Article in English | MEDLINE | ID: mdl-34770751

ABSTRACT

Deep eutectic solvents (DES) using magnesium chloride hexahydrate [MgCl2·6H2O] and urea [U] proportions (1:1) and (2:1), were prepared for their use as extracting and stabilizer agents for red and violet betalains from beetroot (Beta vulgaris) waste. The synthetized DES [MgCl2·6H2O] [U] showed similar properties to eutectic mixtures, such as, liquid phase, low melting points and conductivity, thermal stability, and variable viscosity. In turn, betalain DES extracts (2:1) exhibited compatibility in the extraction and recovery of betalains from beetroot wastes, showing a betalain content comparable to that of betalain extracts. Betalain stability was determined by degradation tests; the exposure conditions were visible light (12 h), molecular oxygen from atmospheric air and environmental temperature (20-27 °C) for 40 days. The kinetic curves of the betalain degradation of water samples depicted a first-order model, indicating the alteration of a violet colouration of betalains from beetroot waste for 5-7 days. However, betalains from DES extracts were kept under visible light for 150 days, and for 340 days in storage (amber vessels), achieving a stability of 75% in comparison with initial beet extracts.


Subject(s)
Beta vulgaris/chemistry , Betalains/chemistry , Betalains/isolation & purification , Plant Extracts/chemistry , Solvents/chemistry , Betalains/analysis , Chemical Fractionation , Chemical Phenomena , Environment , Molecular Structure , Spectrum Analysis , Vegetables , Viscosity
2.
Acta investigación psicol. (en línea) ; 10(2): 5-16, abr. 2020. graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1152709

ABSTRACT

Resumen En diversas investigaciones se ha observado que los infantes muestran un sesgo hacia la forma al generalizar palabras a nuevos objetos de una categoría. Sin embargo, en estudios con infantes aprendices del idioma español no se ha observado una preferencia en tareas en las que se contrastan objetos similares en la forma, la textura y el color. El objetivo de la presente investigación fue comparar la habilidad de dos grupos de infantes hispanohablantes de 24 meses de edad para formar nuevas categorías a partir de la forma y color como características definitorias. Se empleó el Paradigma intermodal de Atención Preferencial. Los resultados mostraron que los infantes formaron categorías a partir de la forma, pero no del color. Aunque en estudios anteriores no se ha observado un sesgo, si se induce la formación de categorías, los infantes de lengua hispana muestran una preferencia por la forma como característica definitoria cuando se contrasta con el color, se discute en torno a la relación entre esta habilidad y el sesgo hacia la forma observado en otros estudios.


Abstract Early research has demonstrated that children extend new labels on the basis of shape. Nevertheless, some research done in Spanish language, hasn't found a shape preference in contrast to color and texture. The purpose of this research was to compare Spanish Speaking 24-month-old infants skills creating new categories based on the shape and the color of the object, using these categories independently as major characteristics. The Preferential Attention Intermodal Paradigm was used. The output showed that infants formed categories based mainly on the object's shape rather than the color. Although previous studies have not observed a shape bias, this evidence shows that, when the formation of categories is induced, spanish-speaking infants show a preference for defining the shape as the main feature when contrasted with the color. The relationship among this categorization ability and a bias towards the form, seen in other studies, is discussed.

3.
Int. j. morphol ; 34(2): 752-758, June 2016. ilus
Article in English | LILACS | ID: lil-787064

ABSTRACT

To describe the safety areas for placement of 5 anterolateral portals (anterior, anterior lateral, posterior lateral, proximal anterior medial and distal anterior medial portals) and 3 recently described medial portals (anterior medial, posterior medial and distal posterior medial portals) to provide topographical description of the safety of each. A descriptive, observational and cross-sectional study in which femoral triangle dissection was performed in 12 hips. 5 lateral portals and the 3 medial portals were placed. Clinically relevant neurovascular structures associated with each portal, were identified measured and documented. The lateral portal with the highest risk of injury to a nearby neurovascular structure was the anterior portal, the most adjacent to the femoral cutaneous nerve, 1.42 cm (±0.85) lateral to the portal. In the medial portals, the anterior medial portal has the narrowest margin in relation to the femoral artery, 2.14 cm (±0.35) lateral to the portal and medial to the obturator nerve by 0.87 cm (±0.62). The lateral portals have a higher safety margin; the portal with the most proximity to a neurovascular structure is the anterior portal, associated laterally with the femoral cutaneous nerve, presenting a higher risk of injury. Medial portals have a higher risk of injuring the femoral neurovascular bundle as well as the obturator nerve.


El objetivo fue describir las áreas de seguridad para la colocación de 5 portales estándar (portal anterior, anterolateral, posterolateral, portal anterior proximal medial y portal anterior distal medial) y 3 portales mediales emergentes (antero medial, portal posteromedial y posteromedial distal) para proporcionar una descripción topográfica de la seguridad de cada portal. Se realizó un estudio descriptivo, observacional y transversal, en la que se disecó el triángulo femoral de 12 caderas. Se colocaron los 5 portales laterales y los 3 portales mediales. Se documentó la medición de cada estructura neurovascular de relevancia clínica en relación a cada uno de los portales evaluados. En cuanto al portal de mayor riesgo entre los laterales, se encontró el portal anterior con mayor cercanía al nervio cutáneo femoral lateral (1,42±0,85 cm), ubicado lateral al portal. En los portales mediales el portal anterior medial tiene el margen más estrecho respecto a la arteria femoral (2,14±0,35 cm) lateral al portal, y medial el nervio obturador (0,87±0,62 cm). Los portales laterales tienen un amplio margen de seguridad, el portal con el margen más reducido es el portal anterior en relación al nervio cutáneo femoral lateral, presentando un elevado riesgo de lesionarlo, los portales mediales tienen un alto riesgo de lesionar las estructuras neurovasculares femorales y el nervio obturador.


Subject(s)
Humans , Male , Adult , Middle Aged , Arthroscopy/methods , Hip/anatomy & histology , Hip/surgery , Risk Assessment , Arthroscopy/instrumentation , Hip/blood supply , Hip/innervation
4.
Int. j. morphol ; 33(2): 626-631, jun. 2015. ilus
Article in English | LILACS | ID: lil-755520

ABSTRACT

Femoroacetabular impingement syndrome (FAI) is a clinical entity that has been recognized in recent years as a frequent cause of pain and the early development of hip arthrosis. Subspine hip impingement is characterized by the prominent or abnormal morphology of the anteroinferior iliac spine (AIIS), which contributes to the development of a clinical picture that is similar to FAI. The aims of this study were to propose a new morphological classification of the AIIS, to determine the prevalence of the different AIIS morphologies based on this classification and to correlate the presence of said morphologies with different gender and age groups. The sample consisted of 458 hemipelvises from individuals of known age and sex (264 men and 194 women). Each specimen was analyzed to determine the prevalence of each of the different morphologies of the AIIS based on the classification proposed as Type 1: the presence of a concave surface between the AIIS and the acetabular rim; Type 2A: the presence of a flat surface between the AIIS and the acetabular rim; Type 2B the presence of a convex surface between the AIIS and the acetabular rim; and Type 3: the AIIS protrudes inferiorly toward the anterior acetabulum. A prevalence of 69.87% was determined for Type 1 AIIS (320/458). In regard to abnormal morphology, prevalences of 17.90% (82/458), 3.71% (17/458) and 8.52% (39/458) were determined for type 2A, Type 2B and Type 3, respectively. The prevalence of abnormal AIIS morphology was 30.30% (80/264) in male specimens and 29.90% (58/194) in female specimens. This study demonstrates the prevalence of the different morphologies of the AIIS, providing information that will be useful in determining the role of the AIIS in the emergence of subspine hip impingement.


El Síndrome de Pinzamiento Femoroacetabular (PFA) es una entidad clínica reconocida en los últimos años como una causa de dolor y desarrollo de artrosis temprana de cadera. El pinzamiento subespinoso de la cadera se caracteriza por una espina iliaca anteroinferior (EIAI) prominente o con una morfología anormal, lo que contribuye al desarrollo de un cuadro clínico similar al PFA. El objetivo fue proponer una nueva clasificación morfológica de la EIAI y determinar las prevalencias de las distintas morfologías de la EIAI en base a la misma y correlacionarla con los distintos sexos y grupos de edad. La muestra consistió en un total de 458 hemipelvis, de sexo y edad conocidos (264 hombres y 194 mujeres). Cada pieza fue analizada para determinar la prevalencia de variaciones morfológicas de la EIAI en base a la clasificación propuesta. Tipo 1: presencia de una superficie cóncava entre la EIAI y reborde acetabular, Tipo 2A: presencia de una superficie plana entre la EIAI y el reborde acetabular, Tipo 2B: presencia de una superficie convexa entre la EIAI y el reborde acetabular y Tipo 3: la EIAI protruye hacia el acetábulo anterior o inferiormente. Se determinó una prevalencia de 69,87% para la EIAI Tipo 1 (320/458). En cuanto a las morfologías anormales, se determinó una prevalencia de 17,90% (82/458), 3,71% (17/458) y 8,52% (39/459) para los Tipos 2A, 2B y 3, respectivamente. La prevalencia de una morfología anormal en las EIAI de especímenes del sexo masculino fue de 30,30% (80/264) y en el sexo femenino 29,90% (58/194). Se evidencia la prevalencia de las diferentes morfologías que puede tener la EIAI; esta información será de ayuda para determinar el papel de la EIAI en la aparición del pinzamiento subespinoso de la cadera.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Aged, 80 and over , Femoracetabular Impingement , Hip Joint/anatomy & histology , Ilium/anatomy & histology , Age and Sex Distribution , Cross-Sectional Studies
5.
Insect Sci ; 20(6): 734-42, 2013 Dec.
Article in English | MEDLINE | ID: mdl-23956070

ABSTRACT

A greenhouse study was conducted to investigate the persistence of methoxyfenozide in pepper (Capsicum annuum L.) foliage. An aqueous suspension of methoxyfenozide was sprayed on pepper plants at concentrations of 72 and 144 mg of active ingredient (a.i.)/L. Foliage was collected at different intervals of time (0, 3, 5, 10, 20, 30, 40, and 50 days) after the treatment, and the methoxyfenozide residue was measured by high-performance liquid chromatography. The foliage was also used in bioassays to determine the residual toxicity on and the consumption rate of the third-instar larvae of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae). The methoxyfenozide concentrations observed after 50 days had decreased to 19 and 69 µg/g per sample, corresponding to a loss of 61% and 28% from the application concentrations of 72 and 144 mg a.i./L, respectively. When fitting a first-order kinetics degradation model, the half-life (DT50 ) of this compound was 76 days. Both application concentrations of methoxyfenozide caused a high mortality rate (≥97%) when the larvae were fed the pepper foliage collected at all of the time intervals. Lastly, at all of the time points, the consumption rate by the larvae was reduced to between 57% and 92% for both concentrations that were bioassayed. Our results indicate that, under the present greenhouse conditions, the degradation of methoxyfenozide was slower than that reported by other authors and that its residues were highly toxic to S. exigua larvae. The implications of these results for the management programs of this pest are discussed.


Subject(s)
Hydrazines , Juvenile Hormones , Moths/drug effects , Pesticide Residues/analysis , Animals , Capsicum , Feeding Behavior/drug effects , Hydrazines/analysis , Hydrazines/toxicity , Juvenile Hormones/analysis , Juvenile Hormones/toxicity , Larva/drug effects , Pesticide Residues/toxicity
6.
Gac. méd. Caracas ; 110(2): 210-216, jun. 2002. ilus
Article in Spanish | LILACS | ID: lil-349129

ABSTRACT

Este estudio se propone distinguir la diversidad de formas que adopta la vellosidad placentaria hidrópica en caso de aborto, mola hidatidiforme y displasia mesenquimal placentaria mediante una secuencia de imágenes logradas con microscopia de luz y electrónica de "barrido", Vesículas vellositarias procedentes de legrado, de diversos tamaños, fueron tomadas para ser procesadas con las técnicas rutinarias de hematoxilina-eosina y microscopia electrónica de "barrido". Los resultados en imágenes micrográficas demostraron la diferenciación histopatológica de la vellosidad en las tres lesiones mencionadas basadas en criterios morfológicamente ya establecidos en la litertura. Como hay diferencias en el origen, la morfología y la historia natural de estas vellosidades, esta secuencia nos permite identificar especímenes raros que se desvíen de las aquí mostradas


Subject(s)
Humans , Adult , Female , Pregnancy , Chorionic Villi , Medicine , Venezuela
7.
Arq. bras. oftalmol ; 61(1): 54-60, jan.-fev. 1998. ilus, tab
Article in Portuguese | LILACS | ID: lil-207961

ABSTRACT

Este estudo retrospectivo apresenta a experiência no tratamento do espasmo facial unilateral com toxina botulínica tipo A. Dezenove pacientes receberam 71 aplicaçöes. O índice de sucesso foi de 94,4 por cento. A duraçäo média do efeito foi de 17,7 por cento (ñ7,2) semanas. A incidência de complicaçöes foi de 35,2 por cento e dose dependente, todas elas locais, transitórias e de grau leve a moderado


Subject(s)
Humans , Facial Muscles/abnormalities , Spasm/drug therapy , Botulinum Toxins, Type A/therapeutic use
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