Eighteen 4-methylcoumarins bearing methoxy/hydroxy/acetoxy functionalities have been reported to effectively inhibit the rat liver microsome-mediated aflatoxin B
1-DNA binding in vitro. The ...contribution of functionality on coumarin nucleus towards the inhibition of AFB
1-DNA binding is in the order acetoxy > hydroxy > methoxy. The results illustrate the structure-activity relationship.
Eighteen 4-methylcoumarins bearing methoxy/hydroxy/acetoxy/ethoxycarbonylmethyl/ ethoxycarbonylethyl functionalities have been found to effectively inhibit the rat liver microsome-mediated aflatoxin B
1DNA binding in vitro. The contribution of functionality on coumarin nucleus towards the inhibition of AFB
1DNA binding is in the order acetoxy > hydroxy > methoxy, the ethoxycarbonylalkyl side chain has no effect on inhibition of aflatoxin B
1DNA binding.
Various list accessing algorithms have been proposed in the literature and their performances have been analyzed theoretically and experimentally. Move-To-Front (MTF) and Transpose (TRANS) are two ...well known primitive list accessing algorithms. MTF has been proved to be the best performing online algorithm till date in the literature for real life inputs and practical applications with locality of reference. It has been shown that when storage space is extremely limited and pointers for lists cannot be used, then array implementation of TRANS gives efficient reorganization. Use of MTF is extensive in the literature whereas, the use of TRANS is rare. As mentioned as an open problem in literature, direct bounds on the behavior and performance of various list accessing algorithms are needed to allow realistic comparisons. Since it has been shown that no single optimal permutation algorithm exists, it becomes necessary to characterize the circumstances that indicate the advantage in using a particular list accessing algorithm. Motivated by above challenging research issue, in this paper we have made an analytical study for evaluating the performance of TRANS list accessing algorithm using two special types of request sequences without locality of reference. We have compared the performance of TRANS with MTF and observed that TRANS outperforms MTF for these considered types of request sequences.
The essential oils obtained by steam distillation of the seeds of Trachyspermum roxburghianum Benth. ex. Kurz., Apiaceae (Umbelliferae), from Assam, India, were analyzed by capillary GC and GC/MS. ...Thirty-two compounds were identified in the oils of both immature and mature seeds, accounting for 99.6% and 99.0% of the total yields, rerspectively. The main component was limonene which made up 40.9-47.2% of the bulk of the respective oils. Other notable constituents were sabinene (20.3% and 8.5%, respectively), terpinen-4-ol (8.6% and 12.2%), (Z)-ligustilide (5.1% and 8.0%) and γ-terpinene (5.6% and 6.7%).
List accessing problem has been studied as a problem of significant theoretical and practical interest in the context of linear search. Various list accessing algorithms have been proposed in the ...literature and their performances have been analyzed theoretically and experimentally. Move-To-Front(MTF),Transpose (TRANS) and Frequency Count (FC) are the three primitive and widely used list accessing algorithms. Most of the other list accessing algorithms are the variants of these three algorithms. As mentioned in the literature as an open problem, direct bounds on the behavior and performance of these list accessing algorithms are needed to allow realistic comparisons. MTF has been proved to be the best performing online algorithm till date in the literature for real life inputs with locality of reference. Motivated by the above challenging research issue, in this paper, we have generated four types of input request sequences corresponding to real life inputs without locality of reference. Using these types of request sequences, we have made an analytical study for evaluating the performance of MTF list accessing algorithm to obtain some novel and interesting theoretical results.
Frequency Count (FC) algorithm is considered as the static optimal algorithm for the list accessing problem. In this paper, we have made a study of FC algorithm and explore its limitation. Using the ...concept of weak look ahead, we have proposed a novel Variant of Frequency Count (VFC) list accessing algorithm. We have evaluated the performance of FC and our proposed VFC algorithm experimentally using input data set from Calgary Corpus. Our experiments show that for all request sequences and list generated from the above data set VFC performs better than FC.
Several compounds from
Piper species bearing methylenedioxyphenyl moieties are reported for the first time to effectively inhibit the rat liver microsome-mediated aflatoxin B
1-DNA binding
in vitro. ...From the preliminary results obtained, a structure-activity relationship is proposed.
Several compounds from
Piper species bearing methylenedioxyphenyl moieties are reported for the first time to effectively inhibit the rat liver microsome-mediated aflatoxin B
1-DNA binding
in vitro. From the preliminary results obtained, a structure-activity relationship is proposed.
Eighteen 4-methylcoumarins bearing methoxy/hydroxy/acetoxy functionalities have been reported to effectively inhibit the rat liver microsome-mediated aflatoxin B1-DNA binding in vitro. The ...contribution of functionality on coumarin nucleus towards the inhibition of AFB1-DNA binding is in the order acetoxy > hydroxy > methoxy. The results illustrate the structure-activity relationship.
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