Xylanase production by a newly isolated Aspergillus niger SS7 was studied in submerged culture. The optimum initial pH for xylanase production was found to be 7.0. Different agricultural and industrial wastes were evaluated for their ability to induce xylanase production by this isolate. The best xylanase production (293.82 IU/ml) was recorded at 3% (w/v) corn cob hulls after 120 h of incubatio...

The convergence of classical PSTN and IP networks requires the transport of SS7 signaling over IP. Since SS7 has very strict availability requirements for the signaling components, redundancy is mandatory. The goal of the IETF RSerPool working group is to define a lightweight, flexible and real-time redundancy concept to fulfill the availability requirements of SS7: Reliable Server Pooling (RSe...

Type 1 allergic diseases are characterized by elevated production of specific immunoglobulin E (IgE) for each antigen and have become a significant health problem worldwide. This study investigated the effect of IgE-mediated allergy on drug pharmacokinetics. To further understand differential suppression of hepatic cytochrome P450 (P450) activity, we examined the inhibitory effect of nitric oxi...

With Voice over IP (VoIP) emerging as a viable alternative to the traditional circuit-switched telephony, it is vital that the two are able to intercommunicate. To this end, the IETF Signaling Transport (SIGTRAN) group has defined an architecture for seamless transportation of SS7 signaling traffic between a VoIP network and a traditional telecom network. However, at present, it is unclear if t...

This paper describes OPNET implementation of the Mobile Application Part (MAP) protocol within the General Packet Radio Service (GPRS) model. MAP represents an application layer protocol residing on top of the Signaling System 7 (SS7) protocol stack. In GPRS networks, MAP protocol supports signaling exchanges with Home Location Register (HLR) and Equipment Identity Register (EIR). We begin with...

(PCS) facilitates the exchange of information (voice, data, video, image, etc.) for mobile users independent of time, location, and access arrangement. To support PCS, mobile communications protocols such as E I W I A Interim Standard 41 (IS-41) 112-161 or Global System for Mobile Communications (GSM) [20] have been defined for PCS Network (PCN) inter-system operations. To support interconnecti...

This paper contains research and development results concerning application of hysteretic control principles to solve SIP servers overload problem, which is known from a number of IETF standards and scientific papers published over the past few years. The problem is that SIP protocol, being the application layer protocol, by default has no build-in means of overload control, as, for example, SS...

The convergence of classical PSTN and IP networks requires the transport of SS7 signalling over IP. Since SS7 has very strict availability requirements to the signalling components, redundancy is mandatory. The goal of the IETF RSerPool working group is to define a lightweight, flexible and realtime redundancy concept to fulfil the availability requirements of SS7: reliable server pooling (RSer...