Butylated Hydroxytoluene [KLH]

We consider an indoor visible light communication (VLC) system comprising of a transmitter (Alice) and a receiver (Bob). The communication from Alice to Bob is prone to active attacks by a malicious node (Eve) installed nearby. Specifically, when the VLC channel contains idle slots, Eve launches impersonation attack-thus, the VLC channel becomes orthogonal multiple access (OMA). On the other hand, when the VLC channel remains fully occupied by Alice, Eve is left with no choice other than to transmit simultaneously and this constitutes a jamming attack-thus, the VLC channel becomes non-orthogonal multiple access (NOMA). To thwart the impersonation attack, Bob authenticates the received packets via binary hypothesis testing (BHT) by utilizing the channel gain as the transmit device fingerprint. As for the jamming attack, Bob treats Eve's interference as Gaussian noise to recover the data sent by Alice. We further study two different physical scenarios: a room and a corridor, respectively. In the former, Bob remains static, while in the latter, Bob is mobile. Thus, for the corridor scenario, Bob tracks Alice's channel via a linear Kalman filter whose prediction is then fed to the BHT as the ground truth. Simulation results show that: i) for OMA VLC, authentication becomes more effective as Eve's distance to Bob becomes more dissimilar to Alice's distance to Bob; ii) for NOMA VLC, the average decoding error probability increases approximately logarithmically with the increase in the interference power of Eve.

The current study is a simple liquid chromatographic method developed and validated for the simultaneous determination of methyl paraben, propyl paraben, butylated hydroxytoluene and alpha-tocopherol in marijuana (delta-8-tetra hydro cannabinol (or) dronabinol) soft gelatin capsules by using high-performance liquid chromatographic technique. The chromatographic separation was achieved on a Waters Xterra RP18 (150 x 4.6)-mm 5-mu m column with a mobile phase contained gradient mixtures, which constitutes of purified water and acetonitrile in the ratio of 700:300 (Port-A) and acetonitrile (Port-B). The optimized flow rate of 2.0 mL/min and UV detection was made at 210 nm and column temperature of 40 degrees C. The resolution among MP, PP, BHT and ATP was found to be > 4. The optimized method was validated as per the guidelines prescribed by the international conference on harmonization. Regression analysis confers a correlation coefficient higher than 0.999 for MP, PP, BHT and ATP peaks. The % RSD for the interday and intraday precisions for MP, PP, BHT and ATP was estimated and found to be < 5.0. The proposed HPLC method could be suitable for the estimation of these drugs in different types of pharmaceutical drug products. Graphic abstract Schematic diagram of the procedure for the simultaneous determination of MP, PP, BHT and ATP contents in marijuana capsules