Field Experiments With a Grooming Switch for OTDM Meshed Networking

Field experiments of 42.7/128.1 Gb/s wavelength-division multiplexed, optical time-division multiplexed (WDM-OTDM) transmultiplexing and all-optical dual-wavelength regeneration at the OTDM rate are presented in this paper. By using the asynchronous retiming scheme, we achieve error-free bufferless data grooming with time-slot interchange capability for OTDM meshed networking. We demonstrate excellent performance from the system, discuss scalability, applicability, and the potential reach of the asynchronous retiming scheme for transparent OTDM-domain interconnection.      

CHANGES IN NITROGENOUS COMPOUNDS IN FRESHWATER CRAYFISH (PROCAMBARUS CLARKII) TAIL MEAT STORED IN ICE

Changes in the protein and nonprotein nitrogen (NPN) fractions in the tail meat of freshwater crayfish (Procambarus clarkii) were monitored during ice storage. In addition, the accumulation of nonprotein nitrogenous compounds was estimated and compared with sensory evaluation. The myofibrillar fraction, expressed as a percentage of total nitrogen, did not vary during this study while the NPN, sarcoplasmic and stroma protein fractions changed during the first week of storage. SDS-PAGE patterns of the sarcoplasmic fraction showed slight differences over storage time. Ammonia nitrogen (NH₃-N), trimethylamine nitrogen (TMA-N) and pH rose at a slow rate during the first week but increased rapidly up to the end of storage. Amino nitrogen (A-N) did not augment to a great extent over time. Sensory scores were significantly correlated (p < 0.05) with pH, A-N, TMA-N, and NH₃-N in descending order.     

家蚕和野蚕杂交后代线粒体的异质性

家蚕、野蚕及其杂交F1代的总DNA经SacⅠ或EcoRⅠ酶切后,分别用来源于家蚕线粒体的细胞色素氧化酶基因和16srRNA基因的RNA探针进行Southern杂交,发现不同来源野蚕的线粒体DNA具多态性,在家蚕×野蚕的F1代可检测到线粒体DNA的异质性,暗示父本野蚕的线粒体DNA可以传递到下一代。