1,720,977 research outputs found
Paternal behaviour of the house mouse: the effect of social status
No full textPaternal behaviour in rodents has been studied only recently (Dudley, 1974; Beilharz, 1975; Elwood, 1975, 1977; Svare et al., 1977; Priestnall, 1979). With this work we wanted to search for variations in the paternal behaviour of mice, divided into three categories: (A) a female and a dominant male (that had previously killed a subordinate one); (B) a female, a dominant male and a subordinate one; (C) a dominant male and a subordinate one (females were removed just before the test)
New insights into an old story. Pollen ROS also play a role in hay fever.
No full textReactive oxygen species (ROS) can exhibit negative and
benign traits. In plants, ROS levels increase markedly during
periods of environmental stress and defense against pathogen
attack. ROS form naturally as a by-product of normal oxygen
metabolism, and evenly play an essential role in cell growth.
The short ROS lifespan makes them ideal molecules to act in
cell signaling, a role they share in both plants and animals. A
particular plant organism, the pollen grain, may closely interact
with human mucosa and an allergic inflammatory response
often results. Pollen grain ROS represent a first, crucial signal
which primes and magnifies a cascade of events in the allergic
response
L'adozione inter- ed intraspecifica nel topo e nel criceto
No full textSi è svolta un'analisi dei segnali infantili che evocano il comportamento parentale nel topo e nel criceto mediante lo studio del retrieving in situazioni inter ed intraspecifiche. Per l'adozione interspecifica criceto-topo è stata particolarmente presa in considerazione la conflittualità nelle femmine di criceto adottanti, derivante da difficoltà di classificazione del piccolo topo, che evoca alternativamente comportamenti parentali ed alimentari
POLLEN VIABILITY, GERMINATION AND TUBE GROWTH: A POWERFUL TOOL TO BIOMONITOR AND ASSESS TRACE ELEMENT CYTOTOXICITY
No full textABSTRACT
Pollen is an extremely simplified organism whose crucial task is to produce and convey the male gametes to the egg cell for fertilization. It represents a suitable tool for chemical toxicity investigations. Pollen-based assays represent an easy and sensitive in vitro test of toxicity at the cellular level. We examined the in vitro response of kiwifruit pollen tubes to increasing concentrations of Cr, As, and Pd, assuming tube growth inhibition as an endpoint for determining potential cytotoxicity and expressing the inhibitory effect as a numerical value (EC50). On the other hand, pollen quality can be assumed as a sensitive indicator of heavy metal pollution, which affects pollen developmental processes. We found appreciable differences in pollen quality in vivo, significantly related to major trace metals of the area studied. Thus, pollen represents a potentially good biomonitoring system. It also offers the advantages of large populations, rapid testing, easy storage, and relatively low cost
Coinvolgimento della via ubiquitina-dipendente nella germinazione del polline
No full texthttp://www.sifv.it/risorse/abstractSIFV/2005bertinoro/gentilini05.pd
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