http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Two New Sesquiterpenes from Pluchea arguta
Viqar Uddin Ahmad,Muhammad Zahid,Rasheeda Khatoon,Zulfiqar Ali,Muhammad Abbas,Muhammad Zafar Iqbal 한국생약학회 1999 Natural Product Sciences Vol.5 No.2
Two new sesquiterpenes, 3`-chloro-2`-hydroxy-3-epi-arguticinin (1) and argutenol (2) belonging to eudesmane and gorgonane classes respectively, have been isolated from Pluchea arguta. Their structures were elucidated with the help of sophisticated spectroscopic techniques including nOe difference and NOESY experiments.
Salvatrione : A Diterpene-monoterpene Conjugate from Salvia bucharica
Viqar Uddin Ahmad,Muhammad Zahid,Muhammad Shaiq Ali,Amir Reza Jassbi,Shakeel Ahmad,Zulfiqar Ali,Muhammad Zafar Iqbal 한국생약학회 2000 Natural Product Sciences Vol.6 No.2
Salvia bucharica belonging to the family Lamiaceae (Labiatae), afforded a novel terpenoid (1) named as salvatrione. The structure of 1 was elucidated through extensive 2-D NMR experiments and the biogenetic pathway of 1 has also been proposed. On biogenetic grounds, 1 may be considered to be a pseudo-triterpenoid as it is derived from the coupling of mono/diterpenic units and not from squalene.
Some warped product submanifolds of a Kenmotsu manifold
Viqar Azam Khan,Mohammad Shuaib 대한수학회 2014 대한수학회보 Vol.51 No.3
Many differential geometric properties of a submanifold of a Kaehler manifold are conceived via canonical structure tensors T and F on the submanifold. For instance, a CR-submanifold of a Kaehler mani- fold is a CR-product if and only if T is parallel on the submanifold (c.f. [2]). Warped product submanifolds are generalized version of CR-product submanifolds. Therefore, it is natural to see how the non-triviality of the covariant derivatives of T and F gives rise to warped product subman- ifolds. In the present article, we have worked out characterizations in terms of T and F under which a contact CR- submanifold of a Kenmotsu manifold reduces to a warped product submanifold.
SOME WARPED PRODUCT SUBMANIFOLDS OF A KENMOTSU MANIFOLD
Khan, Viqar Azam,Shuaib, Mohammad Korean Mathematical Society 2014 대한수학회보 Vol.51 No.3
Many differential geometric properties of a submanifold of a Kaehler manifold are conceived via canonical structure tensors T and F on the submanifold. For instance, a CR-submanifold of a Kaehler manifold is a CR-product if and only if T is parallel on the submanifold (c.f. [2]). Warped product submanifolds are generalized version of CR-product submanifolds. Therefore, it is natural to see how the non-triviality of the covariant derivatives of T and F gives rise to warped product submanifolds. In the present article, we have worked out characterizations in terms of T and F under which a contact CR- submanifold of a Kenmotsu manifold reduces to a warped product submanifold.
Khan, Abdul Viqar Kyung Hee Oriental Medicine Research Center 2006 Oriental pharmacy and experimental medicine Vol.6 No.4
This communication emphasized upon the sensitivity of the crude extracts of clerodendrum inerme against some of the human pathogenic bacteria. Five plant extracts (Petrol, Benzene, Methanol, Ethly acetate and Aqueous) under six different concentrations(500 ${\mu}g/ml$, 1 mg/ml, 2 mg/ml, 5 mg/ml, 10 mg/ml and 15 mg/ml) were tested by disk diffusion method. Methanol, Ethyl acetate and Aqueous extracts of the plant showed significant inhibition against fifteen of the eighteen bacteria tested. No earlier report on antibacterial activity of this taxon could be found in literature.
Chemical Constituents of Pulicaria gnaphalodes
Muhammad Shaiq Ali,Muhammad Jahangir,Muhammad Saleem,Viqar Uddin Ahmad 한국생약학회 1999 Natural Product Sciences Vol.5 No.3
The chloroform extract of Pulicaria gnaphalodes yielded flavonoids (1-2), sesquiterpenoid (3), sterol (4), benzoic acid derivative (5) and fatty acids (6-7). Their structures were elucidated with the aid of NMR spectroscopy. The described compounds have not been reported so far from this source.
Metabolites of Marine Algae Collected from Karachi-coasts of Arabian Sea
Muhammad Shaiq Ali,Muhammad Jahangir,Muhammad Saleem,Muhammad Kashif Pervez,Shaista Hameed,Viqar Uddin Ahmad 한국생약학회 2000 Natural Product Sciences Vol.6 No.2
The ethanolic extracts of marine green, brown and red algae collected from Karachi coasts of Arabian Sea afforded a new enol-derivative of N-acylsphingosine named as coelarthenol (1) from Coelarthrum muelleri, two new glucose-derivatives named: botryenal (2) and botryenol (3) from Botryocladia leptopoda, α-tocopherol quinone (4) from Codium iyengarii, β-sitosterol and hexadecanoic acid from Stokeyia indica. The known constituents (4, β-sitosterol & hexadecanoic acid) have not been reported so far from their corresponding sources and the structures were determined through spectroscopic methods, whereas, the structures of new constituents (1-3) were elucidated with the aid of selective HMBC experiments. The phytotoxicity of 4 was also monitored.
CR-warped product submanifolds of nearly Kaehler manifolds
Nadia S. Al-Luhaibi,Falleh R. Al-Solamy,Viqar Azam Khan 대한수학회 2009 대한수학회지 Vol.46 No.5
As warped product manifolds provide an excellent setting to model space time near black holes or bodies with large gravitational field, the study of these manifolds assumes significance in general. B.Y.Chen [4] initiated the study of CR-warped product submanifolds in a Kaehler manifold. He obtained a characterization for a CR-submanifold to be locally a CR-warped product and an estimate for the squared norm of the second fundamental form of CR-warped products in a complex space form (cf [6]). In the present paper, we have obtained a necessary and sufficient conditions in terms of the canonical structures P and F on a CR-submanifold of a nearly Kaehler manifold under which the submanifold reduces to a locally CR-warped product submanifold. Moreover, an estimate for the second fundamental form of the submanifold in a generalized complex space is obtained and thus extend the results of Chen to a more general setting.
Abdul Jabbar Shah,Anwarul-Hassan Gilani,Kanza Abbas,Munawwer Rasheed,Amir Ahmed,Viqar Uddin Ahmad 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.8
This study describes the chemical composition of the essential oil of Artemisia maritima (Am.Oil) and the pharmacological basis for its medicinal use in gut and airways disorders. Twenty five compounds, composing 93.7% of the oil, were identified; among these, chrysanthenyl propionate and elixene were identified for the first time from any Artemisia species. The Am.Oil (0.3-1.0 mg/mL) suppressed spontaneous and high K^+ (80 mM)-induced contractions in isolated rabbit jejunum, suggestive of an antispasmodic effect mediated possibly through calcium channel blockade. The calcium channel blockade activity was confirmed when pre-treatment of the tissue with Am.Oil (0.01-0.03 mg/mL) shifted the Ca^++ concentration-response curves to the right, similar to verapamil and papaverine. In isolated tracheal strips, Am.Oil inhibited carbachol (CCh; 1 μM)-induced contractions more than that induced by K^+ and shifted the isoprenaline-induced inhibitory CRCs to the left, similar to papaverine, suggestive of potentiation, while, verapamil was more potent against K^+ than CCh-induced contractions and had no potentiating effect on isoprenaline-induced inhibitory CRCs. These data indicate that the Am.Oil exhibited spasmolytic and bronchodilator activities mediated possibly through dual blockade of calcium channels and phosphodiesterase, which provides the pharmacological basis to the medicinal use of Artemisia maritima in colic, diarrhea and possibly asthma.