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Search Results: 1 - 10 of 5223 matches for " Jessica Feldman Katz "
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Evaluación química y sensorial del chorizo tipo Pamplona, elaborado a partir de carne de Cerdo Pelón Mexicano y de Cerdo Mejorado
Lissette Pérez Casas,María de la Salud Rubio Lozano,Danilo Méndez Medina,Jessica Feldman Katz
Veterinaria México , 1999,
Abstract: El objetivo fue comprobar las ventajas de la utilización de la carne del Cerdo Pelón Mexicano (CPM) en un embutido procesado y madurado de alta calidad, tal como el chorizo tipo Pamplona. Las diferencias principales, a lo largo del proceso de maduración, entre los chorizos del CPM y de cerdos mejorados (CM) se encontraron en los porcentajes de proteínas solubles, cenizas y humedad (P < 0.05). Los productos del CPM tienden a retener mayor humedad durante todo el proceso de maduración, con excepción de la última etapa, en la que ambos productos finales tienen la misma humedad. El contenido de proteínas solubles en el chorizo a lo largo de la maduración, fue consistentemente mayor en el CPM que en el CM. Por otra parte, los chorizos del CPM obtuvieron mejores calificaciones en apariencia y textura que los del CM (P < 0.05). Se concluye que la carne de CPM ofrece ventajas específicas en la preparación de productos procesados y madurados de alta calidad. Los factores determinantes fueron la mayor retención de humedad y la mayor solubilización de proteínas a lo largo del proceso, pues ayudaron a obtener un producto final de mejor apariencia y textura. Por otra parte, el sabor y el aroma de los productos no se vieron afectados, pues la elaboración del chorizo tipo Pamplona requiere del picado y la consecuente destrucción de la integridad de la unidad muscular, con lo que la grasa intramuscular que le confiere las características especiales a la carne del CPM pierde parte de su función al mezclarse con la grasa a adida.
Evaluación química y sensorial de morcón de Cerdo Pelón Mexicano y Cerdo Mejorado
Lissette Beatriz Pérez Casas,María de la Salud Rubio Lozano,Danilo Méndez Median,Jessica Feldman Katz
Veterinaria México , 1999,
Abstract: El objetivo de este proyecto fue evaluar las características químicas y sensoriales del morcón (producto cárnico tipo espa ol de alta calidad, elaborado con las puntas de lomo del cerdo) a partir de la utilización de carne de Cerdo Pelón Mexicano (CPM), y compararlo con el elaborado con carne de Cerdo Mejorado (CM). Los productos elaborados de los dos tipos de cerdos fueron madurados durante 4 semanas. Los muestreos de las piezas de morcón se tomaron cada 7 días. Los análisis químicos que se realizaron fueron: Actividad de agua (Aw), cenizas, porcentaje de humedad, pH, proteínas solubles, nitratos, nitritos y fosfatos. Las diferencias encontradas entre el CPM y el CM fueron el porcentaje de humedad y la Aw (P < 0.01). El morcón elaborado con carne de CPM retiene mayor agua, obteniéndose una mejor textura. Los resultados en la evaluación sensorial mostraron una diferencia significativa entre los dos productos en el aroma, apariencia y textura (P < 0.05), teniendo una mejor aceptación el de CPM. Este estudio provee de información para la posibilidad de introducir al CPM en el mercado mexicano.
Efecto del tipo de grasa y el pirofosfato de sodio en la calidad química y sensorial de productos elaborados con carne de oveja
Jessica Feldman Katz,María de la Salud Rubio Lozano,Danilo Méndez Medina,Lissette Beatriz Pérez Casas
Veterinaria México , 1999,
Abstract: Se elaboraron y evaluaron embutidos con carne ovina utilizando grasa vegetal, lardo de Cerdo Pelón Mexicano y pirofosfato de sodio (PF). Se utilizaron 32 kg de carne de borrego: 12 kg para elaborar jamón cocido, realizando 2 tratamientos: el primero con PF y segundo sin PF; 20 kg para elaborar chorizo tipo espa ol realizando 4 tratamientos: el primero con lardo de cerdo, el segundo con grasa vegetal, el tercero con lardo de cerdo con PF y el cuarto con grasa vegetal con PF. Se hicieron análisis químicos: pH, humedad, cenizas, proteína, fosfatos, grasa, nitritos y nitratos. Entre los tratamientos con y sin pirofosfato no hubo diferencias significativas (P > 0.05). Para los tratamientos con los dos tipos de grasa se observó diferencia significativa (P < 0.05) en el porcentaje de humedad, siendo mayor en los productos con lardo de cerdo. La evaluación sensorial de los productos con un panel de consumidores no mo stró diferencias significativas (P > 0.05) entre los tratamientos.
The Mother Centriole Plays an Instructive Role in Defining Cell Geometry
Jessica L. Feldman,Stefan Geimer,Wallace F. Marshall
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0050149
Abstract: Centriole positioning is a key step in establishment and propagation of cell geometry, but the mechanism of this positioning is unknown. The ability of pre-existing centrioles to induce formation of new centrioles at a defined angle relative to themselves suggests they may have the capacity to transmit spatial information to their daughters. Using three-dimensional computer-aided analysis of cell morphology in Chlamydomonas, we identify six genes required for centriole positioning relative to overall cell polarity, four of which have known sequences. We show that the distal portion of the centriole is critical for positioning, and that the centriole positions the nucleus rather than vice versa. We obtain evidence that the daughter centriole is unable to respond to normal positioning cues and relies on the mother for positional information. Our results represent a clear example of “cytotaxis” as defined by Sonneborn, and suggest that centrioles can play a key function in propagation of cellular geometry from one generation to the next. The genes documented here that are required for proper centriole positioning may represent a new class of ciliary disease genes, defects in which would be expected to cause disorganized ciliary position and impaired function.
The Mother Centriole Plays an Instructive Role in Defining Cell Geometry
Jessica L Feldman,Stefan Geimer,Wallace F Marshall
PLOS Biology , 2007, DOI: 10.1371/journal.pbio.0050149
Abstract: Centriole positioning is a key step in establishment and propagation of cell geometry, but the mechanism of this positioning is unknown. The ability of pre-existing centrioles to induce formation of new centrioles at a defined angle relative to themselves suggests they may have the capacity to transmit spatial information to their daughters. Using three-dimensional computer-aided analysis of cell morphology in Chlamydomonas, we identify six genes required for centriole positioning relative to overall cell polarity, four of which have known sequences. We show that the distal portion of the centriole is critical for positioning, and that the centriole positions the nucleus rather than vice versa. We obtain evidence that the daughter centriole is unable to respond to normal positioning cues and relies on the mother for positional information. Our results represent a clear example of “cytotaxis” as defined by Sonneborn, and suggest that centrioles can play a key function in propagation of cellular geometry from one generation to the next. The genes documented here that are required for proper centriole positioning may represent a new class of ciliary disease genes, defects in which would be expected to cause disorganized ciliary position and impaired function.
Need for Containment as a Motivation for Facebook Use  [PDF]
Liat Feldman
Social Networking (SN) , 2018, DOI: 10.4236/sn.2018.71001
Abstract:
Research reveals a mixed picture regarding Facebook uses and psychological effects associated with them. This study looks at this issue through the lens of the psychoanalytic concept of containment. We combined this concept with the anxious and avoidant forms of attachment to create a framework with which to investigate the active and passive uses of Facebook. Using a questionnaire administered to 275 Israeli students, we established that the need for containment predicted logging onto and posting on Facebook after negative experiences. In addition, fulfillment of one’s need for containment was associated with posting on Facebook. We also observed a positive change in one’s feelings about oneself and one’s subjective sense of visibility after posting on Facebook. These results offer a new approach to exploring both Facebook use and its effects.
Cooling of Granules in Vibrating, Suspended Bed: Engineering Simulation  [PDF]
Valery Katz, Slava Katz
Modern Mechanical Engineering (MME) , 2016, DOI: 10.4236/mme.2016.62009
Abstract: Here we suggest an algorithm for calculation of the process parameters and design of a vertical cooler with inclined, gas-permeable blades and with a vibrating, suspended layer of granules on them (Vibrating Fluidized Bed—VFB). The algorithm is based on the use of the equations of heat and material balance, taking into account the influx of moisture into the layer with cold air and dust—as a carryover. Mode entrainment of dust particles and moisture from the VFB is described by using empirical formulas and Π-theorem. To calculate the cooling time of granules a model of the dynamics of a variable mass VFB was built, which linked the geometrical and physical process parameters to a single dependency. An example showed that mass flow of granules of 248 kg/h and a volume flow of air of 646 m3/h with temperature of 30 to cool the zeolite granules from 110 to 42 for 49 s required a vertical apparatus of rectangular shape with four chambers and with volume of 0.2 m3. A comparative analysis of technological parameters of the projected cooler with the parameters of typical industrial apparatuses showed that for all indicators: the cooling time of granules, the flow rate of gas (air) and the heat flow, a 4-chambered, vertical apparatus of rectangular shape with VFB was the most effective.
Cell Interactions and Patterned Intercalations Shape and Link Epithelial Tubes in C. elegans
Jeffrey P. Rasmussen,Jessica L. Feldman,Sowmya Somashekar Reddy,James R. Priess
PLOS Genetics , 2013, DOI: 10.1371/journal.pgen.1003772
Abstract: Many animal organs are composed largely or entirely of polarized epithelial tubes, and the formation of complex organ systems, such as the digestive or vascular systems, requires that separate tubes link with a common polarity. The Caenorhabditis elegans digestive tract consists primarily of three interconnected tubes—the pharynx, valve, and intestine—and provides a simple model for understanding the cellular and molecular mechanisms used to form and connect epithelial tubes. Here, we use live imaging and 3D reconstructions of developing cells to examine tube formation. The three tubes develop from a pharynx/valve primordium and a separate intestine primordium. Cells in the pharynx/valve primordium polarize and become wedge-shaped, transforming the primordium into a cylindrical cyst centered on the future lumenal axis. For continuity of the digestive tract, valve cells must have the same, radial axis of apicobasal polarity as adjacent intestinal cells. We show that intestinal cells contribute to valve cell polarity by restricting the distribution of a polarizing cue, laminin. After developing apicobasal polarity, many pharyngeal and valve cells appear to explore their neighborhoods through lateral, actin-rich lamellipodia. For a subset of cells, these lamellipodia precede more extensive intercalations that create the valve. Formation of the valve tube begins when two valve cells become embedded at the left-right boundary of the intestinal primordium. Other valve cells organize symmetrically around these two cells, and wrap partially or completely around the orthogonal, lumenal axis, thus extruding a small valve tube from the larger cyst. We show that the transcription factors DIE-1 and EGL-43/EVI1 regulate cell intercalations and cell fates during valve formation, and that the Notch pathway is required to establish the proper boundary between the pharyngeal and valve tubes.
Trees and Nests: A Comparison between Two Hierarchical Metaphors in Educational Applications  [PDF]
Adi Katz
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.31021
Abstract: The aim is to determine whether one of two hierarchical metaphors, the tree (parent-child) or the nested (object-container), is more suitable for designing educational interfaces for children. To cope with this issue an experimental educational application was designed with a prototype for each hierarchical metaphor. The application was evaluated in a laboratory experiment, where children participants interacted with the prototypes to find answers for questions that require searching for information. Task performance was measured in terms of effectiveness, efficiency and subjective aspects such as user perception of ease of use and user preference. The nested (object-container) metaphor was found to be preferred by users and superior in several objective parameters of performance efficiency, but no significant differences were found in the perceived ease of use and in the performance effectiveness. Implications for designing educational applications are discussed.
The Role of the Press in the Unilateral Disengagement Plan of Israel from Gaza Strip  [PDF]
Yaron Katz
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.31002
Abstract:

The Disengagement Plan is the name assigned to the plan enacted in the summer of 2005 to evict all Israelis and military bases from Gaza Strip and four isolated settlements in northern Samaria and to withdraw unilaterally. The plan was controversial, yet it won the support of the majority of the cabinet and the Knesset members, as well as the support in Israel and the world. The eviction process of the residents was accompanied by vast activities of the army and police forces in fear of violent acts by the evacuees, and by extensive media coverage. It was one of the longest and most covered events in the history of Israel and intensified the conflict between security needs and free press. In democracies such as Israel, which faces security needs on permanent basis, the media are expected to carry social responsibility duties of not publishing information that is sensitive to national security. It is commonly agreed that although Israel is a democratic state where freedom of speech and freedom of the press are cornerstones of its existence, in all that relates to security things should be different, and security issues are above the need of the media to publish and the need of the public to know. The position of the press in the disengagement and the way they dealt with this dilemma are analyzed in this study based on covering reports in the main Israeli daily newspaper—Yediot Achronot—during the period from January 1, 2005 through August 24, 2005, when the evacuation of all Israelis from Gaza Strip was completed.

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