Glycosidases in pear pollen tube development

During the in vitro germination of pear pollen, several hydrolases were released into the medium. They were apparently eluted from the pollen grain, since the activity was the same when germination was inhibited. These enzymes, once released, had no role in tube growth, since resuspension of pollen in fresh medium after 1.5 hr of incubation did not result in a change of the subsequent tube growth. Homogenates of the pollen suspension at different stages of development showed no significant changes in phosphatase, β-glucosidase, or β-galactosidase activity. However, patent β-glucosidase activity measured directly in suspensions of intact pollen did increase after germination in proportion to tube wall development. Nojirimycin, a specific inhibitor of glucosidases, reduced this β-glucosidase activity by 75% at 10−5M and significantly reduced growth rate at 10−4

Non-proteinuric chronic kidney disease in diabetes patients: reality or effect of control

El declinar de la tasa de filtración glome-rular (eGFR4) es generalmente observado en pacientes con diabetes mellitus (DM) siguiendo a macroalbuminu-ria. Hay evidencia que puede presentarse durante micro (MA) y aun normo albuminuria (NA). En el estudio del riñón de la Clínica Joslin en pacientes con DM tipo1 en un seguimiento de 8 años el declinar de eGFR ocurrió en el 10% de los NA y el 35% de MA. En un estudio de DM tipo2 con enfermedad renal Crónica (ERC) el 30% no presentó retinopatía ni albuminuria patológica. Objetivo: conocer la frecuencia de enfermedad renal crónica (ERC) no proteinúrica y sus factores asociados en los diabéticos atendidos en el consultorio de diabeto-logía del Hospital L. Lagomaggiore

Rigid-rod push–pull naphthalenediimide photosystems

Design, synthesis and evaluation of advanced rigid-rod π-stack photosystems with asymmetric scaffolds are reported. The influence of push–pull rods on self-organization, photoinduced charge separation and photosynthetic activity is investigated and turns out to be surprisingly small overall

First records of two mealybug species in Brazil and new potential pests of papaya and coffee

Five mealybug (Hemiptera: Pseudococcidae) plant pest species: Dysmicoccus grassii (Leonardi), Ferrisia malvastra (McDaniel), Ferrisia virgata (Cockerell), Phenacoccus tucumanus Granara de Willink, and Pseudococcus elisae Borchsenius are recorded for the first time in the state of Espírito Santo, Brazil. These are the first records of D. grassii in Brazil, from papaya (Carica papaya, Caricaceae), and from coffee (Coffea canephora, Rubiaceae). Ferrisia malvastra is also newly recorded in Brazil, where it was found on Bidens pilosa (Asteraceae). Ferrisia virgata was collected from an unidentified weed and Phenacoccus tucumanus from Citrus sp. (Rutaceae). Plotococcus capixaba Kondo was found on pitanga (Eugenia cf. pitanga, Myrtaceae) and Pseudococcus elisae on Coffea canephora, which are new host records for these mealybugs

Interrelationships among dependency, empathy, and sharing

The sharing behavior of 66 fourth-grade students was observed in two different experimental situations: (a) in the experimenter's presence (visible sharing), and (b) anonymously (invisible sharing). In addition, measures of empathy and dependency were given to each child. For girls some support was found for a positive relationship between empathy and sharing in both of the experimental conditions; also, moderate dependency, as measured by peer and teacher ratings, was related to invisible sharing. The correlations found among the variables were quite different for boys. Both empathy and dependency, as measured by the Children's Social Desirability Questionnaire, were negatively related to invisible sharing, and empathy was positively correlated to social desirability scores. Also, as indicated by curvilinear analyses, the interrelationships among these variables for boys were more complex than were suggested by simple linear correlations.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45373/1/11031_2005_Article_BF01650603.pd