We analyze the performance of the IEEE 802.11b wireless local area networks. We have observed that when some mobile hosts use a lower bit rate than the others, the performance of all hosts is considerably degraded. Such a situation is a common case in wireless local area networks in which a host far away from an Access Point is subject to important signal fading and interference. To cope with t...

Dithiodibenzoic (DTB) acid and mercaptobenzoic (MB) acid were studied to characterize their abilities as modifier agents for lead(II) sensors. For both sensors, the best results were obtained with modified carbon paste electrodes with 24.1% of ligand. The pH influence on the potentiometric response was studied. The selectivity coefficients for both modified electrodes were tabulated. A potentio...

THE COMMON CARP lives in stagnant ponds where it must weather long periods of low environmental oxygen pressure. In a dramatic adaptation to life in this environment, carp and a few related fishes develop a novel myoglobin-like protein, myoglobin-2, found only in the brain (3), where it may assure the oxygen supply and protect the neurons during periods of hypoxia. In this issue, Helbo et al. (...

To examine the potential role of methanobactin (mb) as the extracellular component of a copper acquisition system in Methylosinus trichosporium OB3b, the metal binding properties of mb were examined. Spectral (UV-visible, fluorescence, and circular dichroism), kinetic, and thermodynamic data suggested copper coordination changes at different Cu(II):mb ratios. Mb appeared to initially bind Cu(II...

In a water-air optical wireless communication (OWC) channel, dynamic ocean waves may significantly deflect the light beam from its original direction, thus deteriorating performance. this letter, tracking system to mitigate wave-induced degradation is experimentally demonstrated. By employing on PAM6 system, maximum of 486% improvement (from 140 Mb/s 820 Mb/s) in throughput realized at 1.2-m ai...

Objective(s): The Janus kinase-signal transducers and activators of transcription signaling pathway (JAK/STAT pathway) play an important role in proliferation of breast cancer cells. Previous data showed that inhibition of STAT3 suppresses the growth of breast cancer cells, but the associated mechanisms are not well understood. This study aims to investigate the effect and associated mechanisms...

OBJECTIVE To determine if women who were randomized to a mind/body program before starting their first IVF cycle would have higher pregnancy rates than control subjects. DESIGN Randomized, controlled, prospective study. SETTING Private academically affiliated infertility center. PATIENT(S) A total of 143 women aged≤40 years who were about to begin their first IVF cycle. INTERVENTION(S) ...

The channel transfer functions (or channel gains) of fading channels significantly impact both the received SNR (signal-to-noise ratio) and the PER (packet error rate) of received packets in OFDM-based WLANs. This paper uses the probability distribution of the average channel gain of the fading channel to analyze the degree of fading effects on the PER in OFDM systems. PER performance of the re...

Common synthetic dyes, e.g., Weak Acid Pink Red B (APRB, C.I. 18073), Mordant Blue 9 (MB, C.I.14855) and Acid Brilliant Blue 6B (ABB6B, C.I. 42660), can be removed from water by in situ hybridization with CaCO(3), BaSO(4) and Ca(3)(PO(4))(2) and the resulting hybrids thus prepared used as plastic colorants. All the hybrids can be processed into polypropylene (PP) at 200 °C with good color inten...

Although there are numerous studies of glucuronidation of endogenous compounds, information on the glucuronidation of fatty acids is lacking. In the present studies, both linoleic acid (LA) and its biologically active oxidized derivatives, 13-hydroxyoctadecadienoic acid (13-HODE) and 13-oxooctadecadienoic acid (13-OXO), have been shown to be effective substrates for human liver UDP-glucuronosyl...