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Objective of research was (a) to evaluate the influence of pollination-prevention on various metabolic parameters of the two maize inbreds B73 and B14A and their F1, and (b) to gain information on the inheritance of leaf senescence, in response to pollination-prevention. The results show that the visual pattern of leaf senescence, in response to prevention of ear pollination, contrasts markedly between the two inbred lines. Relative to control plants, prevention of ear pollination, causes a premature senescence in B73 and B73 x B14A plants, while leaves of unpollinated B14A remain green and similar in appearance to pollinated controls. Furthermore, prevention of ear pollination induces a sizable reduction of dry matter accumulation of all above-ground material and changes in various metabolic parameters. An accumulation of sucrose in the leaves of unpollinated B73 and B73 x B14A plants is correlated with the development of premature senescence. Finally, the genetic analysis supports suggestions that a single dominant gene is responsible for the differences observed, in the visual pattern of leaf senescence, in response to prevention of ear pollination.

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Lipomas are mesenchymal tumors characterized by the abnormal proliferation of adipocytes. We describe a case of retroperitoneal lipomas in a patient with chronic lymphatic leukemia, who was referred to our sonography unit for a regular (6-month) follow-up scan. She had no abdominal symptoms of note. The sonographic examination revealed two well-defined, hyperechoic, oval-shaped masses: the first situated between the posterior wall of the stomach, the duodenum, and the head of the pancreas; the second lying craniomedial to the left kidney. Neither of the masses exhibited intralesional vascularization on color Doppler imaging. Retrospective examination of previous CT scans revealed that the lesions had been present for the past 4 years. Their slow growth was consistent with the suspicion of retroperitoneal lipomas, and this diagnosis was confirmed by magnetic resonance imaging. CT and MRI are the imaging studies of choice for diagnosing retroperitoneal lipomas, but ultrasonography is ideal for the follow-up of these patients because it is repeatable and relatively low in cost.Sommario Il lipoma è un tumore ad origine mesenchimale, caratterizzato da un'abnorme proliferazione locale di cellule adipose. Presentiamo il caso di una paziente, affetta da leucemia linfatica cronica, giunta alla nostra osservazione per il follow-up semestrale, in assenza di sintomi addominali. All'esame ecografico abbiamo osservato la presenza di due formazioni iperecogene, a margini netti; una compresa tra la parete posteriore dello stomaco, duodeno e testa pancreatica e una posta cranialmente e medialmente rispetto al rene sinistro. L'indagine color Doppler ha evidenziato l'assenza di segnali vascolari intralesionali. Retrospettivamente abbiamo analizzato due TC precedenti, eseguite nel corso dei precedenti 4 anni, che hanno confermato l'ipotesi di lipomi retroperitoneali, per la lenta crescita mostrata. Una successiva risonanza magnetica confermava la diagnosi. La TC e la RM rappresentano gli esami di scelta per porre la diagnosi di lipoma retroperitoneale, tuttavia l'ecografia è l'esame ideale nel follow-up dei pazienti, considerando l'economicità e la ripetibilità di questa metodica. ª