RESUMEN
Honeybees are threatened by various pathogens and parasites. More than 18 viruses have been described in honeybees and many of them have been detected in China and Argentina. In China, both Apis cerana and Apis mellifera are raised. In Argentina, beekeepers raise different ecotypes of A. mellifera: European honeybees (in both temperate and subtropical regions) and Africanised honeybees (in subtropical areas only). A thorough study was carried out in both China and Argentina to analyse the current virus presence and distribution in different climatic zones and gather information on different bee species/subspecies. Adult honeybees were collected from apiaries in temperate and subtropical regions of China (including areas with exclusive populations of A. mellifera, areas where A. mellifera and A. cerana co-exist, and areas with exclusive populations of A. cerana) and Argentina. Six viruses, namely, deformed wing virus (DWV), black queen cell virus (BQCV), sacbrood virus (SBV), chronic bee paralysis virus (CBPV), acute bee paralysis virus (ABPV) and Israeli acute paralysis virus (IAPV) were detected in China, both in A. cerana and in A. mellifera, while four viruses (DWV, BQCV, CBPV and ABPV) were present in Argentina. Interestingly, multiple infections were commonly found in China, with up to five different viruses co-circulating in some colonies without apparent abnormalities. In this study, no Chinese samples were positive for slow bee paralysis virus. The most prevalent viruses were BQCV (China) and DWV (Argentina). Kashmir bee virus was absent from samples analysed for both countries.
Les populations d'abeilles mellifères sont menacées par de nombreux agents pathogènes et parasites. Parmi eux, 18 virus ont été décrits, dont plusieurs ont été détectés en Chine et en Argentine. Les espèces d'abeilles mellifères élevées en Chine sont Apis cerana et Apis mellifera. En Argentine, les apiculteurs élèvent plusieurs écotypes d'A. mellifera : le type européen dans les régions tempérées et subtropicales et le type africanisé dans les zones subtropicales. Une étude approfondie a été réalisée en Chine et en Argentine dans le but d'identifier les virus présents, d'analyser leur distribution dans différentes zones climatiques et de réunir des informations sur les différentes espèces et sous-espèces d'abeilles présentes. Des abeilles mellifères adultes ont été collectées dans des ruchers des régions tempérées et subtropicales de Chine (zones peuplées exclusivement d'A. mellifera ou d'A. cerana et zones où A. mellifera et A. cerana coexistent) et d'Argentine (A. mellifera seulement). En Chine, six virus, à savoir le virus des ailes déformées, le virus des cellules royales noires, le virus du couvain sacciforme, le virus de la paralysie chronique de l'abeille, le virus de la paralysie aiguë de l'abeille et le virus israélien de la paralysie aiguë ont été détectés aussi bien chez A. cerana que chez A. mellifera ; en Argentine, quatre virus ont été détectés (virus des ailes déformées, virus des cellules royales noires, virus de la paralysie chronique de l'abeille et virus de la paralysie aiguë de l'abeille). Fait intéressant, les infections multiples étaient fréquentes en Chine, avec parfois jusqu'à cinq virus différents circulant dans certaines colonies sans provoquer de manifestations anormales apparentes. Aucun des échantillons analysés en Chine n'a été trouvé positif pour le virus de la paralysie lente de l'abeille. Les virus les plus fréquents étaient, en Chine, le virus des cellules royales noires et en Argentine, le virus des ailes déformées. Le virus du Cachemire n'a été trouvé dans aucun des échantillons analysés dans les deux pays.
Las abejas melíferas están amenazadas por diversos patógenos y parásitos. Se han descrito más de 18 virus que las afectan, muchos de los cuales se han detectado en China y la Argentina. En China se cultivan tanto Apis cerana como Apis mellifera, mientras que los apicultores argentinos crían diferentes ecotipos de A. mellifera: abejas europeas en las regiones templadas y subtropicales y abejas africanizadas en las zonas subtropicales. Los autores exponen un minucioso estudio realizado a la vez en China y la Argentina con el fin de analizar la actual presencia y distribución de virus en diferentes zonas climáticas y reunir información sobre distintas especies y subespecies de abeja. En primer lugar se recogieron abejas adultas de colmenares situados en regiones templadas y subtropicales de China (algunas donde hay exclusivamente poblaciones de A. mellifera, otras donde coexisten A. mellifera y A. cerana y otras zonas que albergan solo poblaciones de A. cerana) y la Argentina (solamente A. mellifera). En las poblaciones chinas tanto de A. cerana como de A. mellifera se detectaron seis virus: virus de las alas deformes (VAD); virus de las celdas reales negras (VCRN); virus de la cría ensacada (VCE); virus de la parálisis crónica de la abeja (VPCA); virus de la parálisis aguda de la abeja (VPAA); y virus de la variante israelí del virus de la parálisis aguda (VPAI), mientras que en la Argentina se observó la presencia de cuatro virus (VAD, VCRN, VPCA y VPAA). Un dato interesante es que en China se observaron con frecuencia infecciones múltiples, con hasta cinco virus diferentes circulando a la vez en algunas colonias sin que ello diera lugar a anormalidades aparentes. Ninguna de las muestras chinas analizadas en el estudio resultó positiva al virus de la parálisis lenta de la abeja. Los virus más prevalentes fueron el VCRN (China) y el VAD (Argentina). El virus Cachemira de las abejas estaba ausente de las muestras analizadas en ambos países.
Asunto(s)
Abejas/virología , Virus ARN/clasificación , Animales , Argentina , Abejas/clasificación , China , Clima , Prevalencia , Virus ARN/aislamiento & purificaciónRESUMEN
OBJECTIVE: To define and differentiate psychological and adjustment problems due to brain injury or brain tumour in children and adolescents. METHODS: Two groups of patients with acquired brain lesions (24 post-traumatic patients and 22 brain tumour survivors), ranging in age between 8-15 years, received a psychological evaluation, including the Child Behaviour Checklist for Ages 4-18 (CBCL) and the Vineland Behaviour Adaptive Scales (VABS). RESULTS: Both groups showed psychological and social adjustment problems. Post-traumatic patients were more impaired than brain tumour survivors. Social adjustment problems were associated to externalizing problems in post-traumatic patients and internalizing problems in brain tumour surviving patients. CONCLUSIONS: These differences in psychological and behavioural disorders between the two groups must necessarily be considered when developing psychological treatment, rehabilitation plan and social re-entry.
Asunto(s)
Adaptación Psicológica , Lesiones Encefálicas/psicología , Neoplasias Encefálicas/psicología , Adolescente , Lesiones Encefálicas/rehabilitación , Neoplasias Encefálicas/rehabilitación , Niño , Femenino , Humanos , Masculino , Escalas de Valoración Psiquiátrica , Conducta SocialRESUMEN
Most research on hygienic behavior has recorded the time taken by the colony to remove an experimental amount of dead brood, usually after one or two days. We evaluated the time that hygienic (H) and non-hygienic (NH) honey bees take to uncap and remove dead brood in observation hives after the brood was killed using the pin-killing assay. Four experimental colonies were selected as the extreme cases among 108 original colonies. Thirty brood cells were perforated with a pin in two H and two NH colonies and observations were made after 1, 2, 3, 4, 5, 6, and 24 h. Different stages of uncapping and removing were recorded. Differences in uncapping and removal between H and NH colonies were significant for all comparisons made at the different times after perforation. Using observation hives one obtains a better and faster discrimination between H and NH colonies than in full size colonies. It is possible to differentiate H and NH within a few hours after perforating the cells
Asunto(s)
Animales , Abejas/fisiología , Conducta Social , Conducta Apetitiva , Aseo Animal , Higiene , Odorantes , Factores de TiempoRESUMEN
Honeybee defensive behavior is a useful selection criterion, especially in areas with Africanized honeybees (Apis mellifera L). In all genetic improvement programs the selected characters must be measured with precision, and because of this we evaluated a metabolic method for testing honeybee defensive behavior in the laboratory for its usefulness in distinguishing between honeybee ecotypes and selecting honeybees based on their level of defensive responses. Ten honeybee colonies were used, five having been produced by feral queens from a subtropical region supposedly colonized by Africanized honeybees and five by queens from a temperate region apparently colonized by European honeybees. We evaluate honeybee defensive behavior using a metabolic test based on oxygen consumption after stimulation with an alarm pheromone, measuring the time to the first response, time to maximum oxygen consumption, duration of activity, oxygen consumption at first response, maximum oxygen consumption and total oxygen consumption, colonies being ranked according to the values obtained for each variable. Significant (p < 0.05) differences were detected between ecotypes for each variable but for all variables the highest rankings were obtained for colonies of subtropical origin, which had faster and more intense responses. All variables were highly associated (p < 0.05). Total oxygen consumption was the best indicator of metabolic activity for defensive behavior because it combined oxygen consumption and the length of the response. This laboratory method may be useful for evaluating the defensive behavior of honey bees in genetic programs designed to select less defensive bees
Asunto(s)
Animales , Abejas , Conducta Animal , Consumo de Oxígeno , Técnicas de Laboratorio ClínicoRESUMEN
BACKGROUND AND OBJECTIVE: The feasibility of gene marking or gene therapy protocols making use of purified CD34+ cells greatly depends on the efficiency of their stable transduction. The great potential of umbilical cord blood as a source of CD34+ cells combined with the availability of advanced cell purification procedures prompted us to evaluate whether incubation with growth factors might influence the type of cells effectively transduced by retroviral vectors. DESIGN AND METHODS: Isolated, at least 95% pure, CD34+ cells were infected with the LXSN murine retrovirus carrying the neomycin-resistance gene. Different schedules of CD34+ cell infection were performed with or without incubation for different times in the presence of Interleukin-3 (IL-3), Interleukin-6 (IL-6) and stem cell factor (SCF). Efficiency of transduction was evaluated by clonogenic assays, semiquantitative PCR and RT-PCR analyses performed either immediately or after 7 day expansion of CD34+ cells in liquid culture in the presence of erythropoietin (EPO), IL-3 and granulocyte-macrophage colony-stimulating factor (GM-CSF). RESULTS: The results obtained indicated that the amount of transduced cells increased with the lenght of incubation with growth factors, either before or during infections. However, different types of cells were transduced depending on the duration of stimulation and infection. Thus, following one week culture of CD34+ cells in the presence of EPO, IL-3 and GM-CSF the clonogenic potential was affected dyshomogeneously. Precisely, with a single 3-hour infection performed after 12 hours of stimulation with growth factors, the clonogenic potential of the transduced cells greatly increased after one week in culture. In contrast, with a 48 hour infection, the transduced cells completely lost their clonogenic potential after one week in culture. INTERPRETATION AND CONCLUSIONS: These results demonstrate that a reasonably high transduction efficiency of purified CD34+ cells can be achieved with short schedules of incubation/infection in the absence of stroma or extracellular matrix.
Asunto(s)
Antígenos CD34/sangre , Ensayo de Unidades Formadoras de Colonias , Sangre Fetal/inmunología , Sustancias de Crecimiento/farmacología , Retroviridae/genética , Transducción Genética , Células Cultivadas , Sangre Fetal/citología , HumanosRESUMEN
The authors reported the outcome of a retrospective study of patients with HELLP syndrome to verify whether this pathology is a clinical entity with models of evolution, regression and well defined treatment. A total of 20 individual cases were reported at the Division of Obstetrics and Gynecology at the G. Gaslini Institute during the period from January 1990 to September 1995. All cases showed the normalisation of the various clinical and hematochemical parameters within a maximum of 8 days after birth. The rapid diagnosis, the immediate extraction of the fetus and appropriate medical treatment led to the prompt resolution of this severe pathology without the need for demolitive surgery frequently used in the past.
Asunto(s)
Síndrome HELLP , Adulto , Anticonvulsivantes/uso terapéutico , Antihipertensivos/uso terapéutico , Cesárea , Femenino , Síndrome HELLP/diagnóstico , Síndrome HELLP/terapia , Humanos , Recién Nacido , Edad Materna , Paridad , Sustitutos del Plasma/administración & dosificación , Plasmaféresis , Embarazo , Estudios Retrospectivos , Factores de TiempoRESUMEN
The Authors report 4 cases of gonadal dysgenesis with a Y chromosome. Every patient underwent bilateral oophorectomy. Two cases of streak gonads, 1 case of streak gonad and gonadoblastoma and 1 case of non metastasizing bilateral gonadoblastoma with foci of dysgerminoma have been found. The Authors emphasize the importance of early bilateral gonadectomy in all cases of gonadal dysgenesis with a Y chromosome.
Asunto(s)
Disgenesia Gonadal/cirugía , Cromosoma Y , Adolescente , Adulto , Amenorrea/etiología , Amenorrea/genética , Femenino , Disgenesia Gonadal/genética , Disgenesia Gonadal/patología , Humanos , Ovariectomía/métodosRESUMEN
The Authors describe a case of HELLP syndrome associated with disseminated intravascular coagulation occurred after delivery in a patient with late hypertension without any sign or symptom of preeclampsia during pregnancy. The use of plasma exchange has contributed to the recovery from the pathology.
Asunto(s)
Anemia Hemolítica/complicaciones , Trastornos de las Plaquetas Sanguíneas/complicaciones , Coagulación Intravascular Diseminada/complicaciones , Intercambio Plasmático , Trastornos Puerperales/terapia , Adulto , Anemia Hemolítica/terapia , Trastornos de las Plaquetas Sanguíneas/terapia , Coagulación Intravascular Diseminada/terapia , Femenino , Humanos , Hígado/enzimología , Recuento de Plaquetas , Embarazo , Trastornos Puerperales/sangre , SíndromeRESUMEN
The Authors report 15 pregnancies obtained by multifollicular ovarian stimulation with gonadotropins. They have used only the utero-ovarian echographic monitoring for ovarian response surveillance, for the timing of hCG administration and for a prognostic judgement of the pregnancy outcome.