Roger Piqueras Jover

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To investigate the role of newly synthesized apocytochrome P450 (P450) in the regulation of 5-aminolevulinate synthase (ALAS), we overexpressed P450 in primary cultures of chick embryo hepatocytes and measured the subsequent effects on ALAS mRNA by semiquantitative RT-PCR. Hepatocytes were co-transfected with a vector for expression of P450 cDNAs (CYP3A4 or(More)
Femtocell networks, consisting of a conventional macro cellular deployment and overlaying femtocells, forming a hierarchical cell structure, constitute an attractive solution to improving the macrocell capacity and coverage. However, the interand intra-tier interferences in such systems can significantly reduce the capacity and cause an unacceptably high(More)
Heme is not only a very important prosthetic group that modulates the structure and activity of heme proteins but also a regulatory molecule that controls metabolic pathways and the biosynthesis of various proteins. However, investigation into heme regulatory effects in higher vertebrates has been hampered by the lack of a suitable animal model. A knockout(More)
The Short Messaging Service (SMS), one of the most successful cellular services, generates millions of dollars in revenue for mobile operators. Estimates indicate that billions of text messages are traveling the airwaves daily. Nevertheless, text messaging is becoming a source of customer dissatisfaction due to the rapid surge of messaging abuse activities.(More)
Modern LTE (Long Term Evolution) cellular networks provide advanced services for billions of users that go beyond traditional voice and short messaging traffic. The recent trend of Distributed Denial of Service (DDoS) attacks impacting the availability of communication systems illustrate the importance of strengthening the resiliency of mobility networks(More)
LTE is currently being proposed for use in a nationwide wireless broadband public safety network in the United States as well as for other critical applications where reliable communication is essential for safety. Unfortunately, like any wireless technology, disruption of these networks is possible through radio jamming. This article investigates the(More)
Voice traffic termination fraud, often referred to as Subscriber Identity Module box (SIMbox) fraud, is a common illegal practice on mobile networks. As a result, cellular operators around the globe lose billions annually. Moreover, SIMboxes compromise the cellular network infrastructure by overloading local base stations serving these devices. This paper(More)
The ongoing evolution of wireless cellular networks is creating a new ecosystem with pervasive presence of a great variety of network-enabled objects which, based on unique addressing schemes, are able to interact with each other. Cellular connectivity is reaching beyond smartphones and tablets, providing access to data networks for connected home(More)
Genetic and acquired heme deficiencies are associated with impaired cytochrome P450 (P450) function in experimental animals and in humans. The hypothetical explanations have been either a decreased supply of heme for saturation of apo-P450 or a requirement of heme for P450 gene transcription. We investigated the effect of heme deficiency on P450 function,(More)
Correspondence: AT&T Security Research Center, New York, NY Full list of author information is available at the end of the article Dr. Raghavan participated in this work while being a member of the AT&T Radio Access and Devices team. Abstract The Long Term Evolution (LTE) is the newly adopted technology to offer enhanced capacity and(More)