Effects of potassium lactate, sodium metasilicate, peroxyacetic acid, and acidified sodium chlorite on physical, chemical, and sensory properties of ground beef patties.

Beef trimmings were treated with 3% potassium lactate (KL), 4% sodium metasilicate (NMS), 0.02% peroxyacetic acid (PAA) or 0.1% acidified sodium chlorite (ASC) or left untreated (CON). Beef trimmings were ground, pattied, and sampled for 7 days. Under simulated retail display, instrumental color, sensory characteristics, TBARS, pH, and Lee-Kramer shear force were measured to evaluate the impact of the treatments on the quality attributes. The NMS and PAA patties were redder (a(∗), P<0.05) than CON on days 0-3. Panelists found KL, NMS, PAA, and ASC patties to have less (P<0.05) or similar (P>0.05) off odor to CON on days 0-3. The NMS and PAA treated patties had lower (P<0.05) lipid oxidation than the CON at days 0, 3, and 7. Therefore, KL, NMS, PAA, and ASC treatments on beef trimmings can potentially improve or maintain quality attributes of beef patties.

The impact of single antimicrobial intervention treatment with potassium lactate, sodium metasilicate, peroxyacetic acid, and acidified sodium chlorite on non-inoculated ground beef lipid, instrumental color, and sensory characteristics.

The effect of using potassium lactate, sodium metasilicate, acidified sodium chlorite, or peroxyacetic acid as a single antimicrobial intervention on ground beef instrumental color, sensory color and odor characteristics, and lipid oxidation was evaluated. Prior to grinding, beef trimmings (90/10) were treated with 3% potassium lactate (KL), 4% sodium metasilicate (NMS), 200-ppm peroxyacetic acid (PAA), 1000-ppm acidified sodium chlorite (ASC), or left untreated (CON). Ground beef under simulated retail display was measured at 0, 1, 2, 3, and 7 of display for instrumental color, sensory characteristics, TBARS values, and pH to evaluate the impact of the treatments. The KL, NMS, PAA, and ASC were redder (a(∗); P<0.05) than CON. All treatments were scored by sensory panelists to have a brighter (P<0.05) red color than CON during days 1-3 of display. All treatments had less (P<0.05) lipid oxidation than CON on days 0, 3, and 7 of display. These results suggest that the use of these antimicrobial compounds on beef trimmings prior to grinding may not adversely affect, and may improve bulk packaged ground beef quality characteristics.

[Assessment of the immigrant child]. / Valoración del niño inmigrante.

In the last twenty years Spain has turned into one of the principal countries recipients of foreign population. As consequence of this massive entry of people, our country is among the first ones of Europe for interannual increase of population. The concept of immigrant child is very wide and includes minors of very diverse characteristics, as the proceeding from international adoptions, the children coming from developing countries or those that come from other developed countries. The immigrant children do not represent health risk for the autochthonous population, on the contrary, they are in situation of defenselessness for their scanty vaccination coverages, their situation of marginality and the precarious sanitary systems of the countries of origin. At the moment of offering medical paediatric attention to foreign children, we must individualize our actions in conformity with the characteristics of each patient. It is not possible to simplify in one unique protocol the best studies to resolve a problem of health in an immigrant child. The attention of these children implies an overstrain for the pediatrician and the sanitary personnel that receives them, because it is necessary to conquer idiomatic, cultural and social barriers to optimize the level of health of these patients. The syndromic initial description can help to prioritize the studies in each case (according to the most probable diagnoses). The children who return to the native land of their parents meet in a special situation of risk, for not being prepared to resist the attack of pathogen that do not exist or are rare in Spain.

Valoración del niño inmigrante / Assessment of the immigrant child

En los últimos veinte años España se ha convertido en uno de los principales países receptores de población extranjera. Como consecuencia de esa entrada masiva de personas, nuestro país se encuentra entre los primeros de Europa en cuanto a incremento interanual de población. El concepto de niño inmigrante es muy amplio y engloba a menores de características muy diversas, como los procedentes de adopciones internacionales, los hijos de familias provenientes de países en vías de desarrollo o aquellos que vienen de otros países desarrollados. Los niños inmigrantes no representan un riesgo de salud para la población autóctona, muy al contrario, suelen estar en situación de desprotección por sus escasas coberturas vacunales, su situación de marginalidad y los precarios sistemas sanitarios de los países de los que proceden.A la hora de brindar atención médica pediátrica a niños extranjeros, debemos individualizar nuestras actuaciones conforme a las características de cada paciente. No se puede simplificar en un protocolo único los estudios a realizar ante un problema de salud en un niño inmigrante. La atención de estos niños implica un sobreesfuerzo para el pediatra y el personal sanitario que los recibe, pues hay que vencer barreras idiomáticas, culturales y sociales para conseguir optimizar el estado de salud de estos pacientes. La descripción sindrómica inicial puede ayudar a priorizar los estudios a realizar en cada caso (según los diagnósticos más probables).Los niños que regresan al país de origen de sus padres se ven en una especial situación de riesgo, por no estar preparados para defenderse de patógenos que no existen o son raros en España

In the last twenty years Spain has turned into one of the principal countries recipients of foreign population. As consequence of this massive entry of people, our country is among the first ones of Europe for interannual increase of population. ;;The concept of immigrant child is very wide and includes minors of very diverse characteristics, as the proceeding from international adoptions, the children coming from developing countries or those that come from other developed countries. ;;The immigrant children do not represent health risk for the autochthonous population, on the contrary, they are in situation of defenselessness for their scanty vaccination coverages, their situation of marginality and the precarious sanitary systems of the countries of origin. ;;At the moment of offering medical paediatric attention to foreign children, we must individualize our actions in conformity with the characteristics of each patient. It is not possible to simplify in one unique protocol the best studies to resolve a problem of health in an immigrant child. The attention of these children implies an overstrain for the pediatrician and the sanitary personnel that receives them, because it is necessary to conquer idiomatic, cultural and social barriers to optimize the level of health of these patients. ;;The syndromic initial description can help to prioritize the studies in each case (according to the most probable diagnoses). ;;The children who return to the native land of their parents meet in a special situation of risk, for not being prepared to resist the attack of pathogen that do not exist or are rare in Spain

[Sinistral portal hypertension with bleeding gastric varices as initial manifestation of renal-cell carcinoma]. / Hipertensión portal izquierda con sangrado por varices gástricas como forma de presentación de un hipernefroma.

We report a clinic case of renal-cell carcinoma presenting as sinistral portal hypertension; a clinical syndrome consisting of esplenic vein thrombosis manifested as isolated gastric varices with patent portal vein and normal hepatic function. The most frequent cause of this syndrome is pancreatic pathology. Renal-cell carcinoma is characterized by a wide variety of symptoms as initial manifestation. In our case, the patient developed a massive gastrointestinal bleeding secondary to isolated gastric varices caused by splenic vein thrombosis due to extrinsic compression by a hypernephroma that infiltrated the pancreas.

[Trends in human immunodeficiency virus infection prevalence in homosexual/bisexual men in Madrid (1986-1995)]. / Evolución de la prevalencia de infección por el virus de la inmunodeficiencia humana en un colectivo de varones homo/bisexuales de Madrid (1986-1995).

BACKGROUND: We analysed the trend in seroprevalence for human immunodeficiency virus (HIV) in homosexual or bisexual men who voluntary requested the test in a sexually transmitted disease/HIV clinic in Madrid. PATIENTS AND METHODS: We studied 5,424 homo/bisexual non-injecting drug user (non-IDU) men, who came for the first time since 1986 to 1995. We analysed the HIV seroprevalence taken into account the year, age and exchange of sex by money. A hundred and thirty-six IDU homo/bisexual men were also attended during the same period and they were compared with non-IDU. RESULTS: HIV seroprevalence among the 5,424 non-IDU homo/bisexual men were 20.2%, rising from 19.6% in 1986 to 29.6% in 1990. After then, the trend decreased to 15.3% in 1995 (chi 2 for trend, 66.8; p < 0.0001). Average age was three years higher among seropositives (p < 0.0001), and showed an upward trend from 29.9 in 1986 to 34.6 in 1995 (p = 0.0059). Seroprevalence among homosexuals younger than 25 fell in the last years. One percent of individuals had ever practiced the prostitution. They were younger (average age, 27.6), and their HIV seroprevalence were 25.9%. A hundred and thirty-six IDU homo/bisexual men were also attended for the first time, being 2.4% of overall homo/bisexual men. They had a higher seroprevalence (48.5%) than non-IDU (p < 0.0001), and did not show any significative time-trend. CONCLUSIONS: A favourable evolution can be observed in HIV seroprevalence among homo/bisexual from Madrid, Spain, men who came to be tested, especially among the youngest. Prevention programs should make an effort to maintain this trend.

Current theories in the calculation of activity coefficients-II. Specific interaction theories applied to some equilibria studies in solution chemistry.

The adequation of the current theories for calculating activity coefficients has been studied for a series of ionic equilibria in analytical chemistry: the water ionic product as well as two reactions of complex formation and oxidation-reduction. In all the cases, the specific interaction theory (SIT) has proved to be adequate and simple to apply in a restricted interval (0.5-3M), whereas Pitzer's theory is outstanding for its high precision in reproducing experimental behaviour and to correlate values of equilibrium constants for different conditions and media.