Densitometry

Publication Title: 
Molecular and Cellular Biology

A telomere terminal transferase activity was identified in developing macronuclear extracts from Euplotes crassus. The activity was essentially unregulated in vitro: up to 50 tandem repeats of the Euplotes telomeric repeat sequence TTTTGGGG were added onto synthetic telomeric oligonucleotide primers. Both the structure of the telomere substrate and its 3'-terminal sequence were recognized. The activity was destroyed by low concentrations of RNase A.

Author(s): 
Shippen-Lentz, D.
Blackburn, E. H.
Publication Title: 
Journal of Chromatographic Science

A thin-layer chromatograpy (TLC) method is developed to analyze artemisinin (AT) and its derivatives, artemether (AM) and arteether (AE), using a silica-gel plate with a mobile phase containing pure chloroform. After development, all products are visualized after dipping in a 4-methoxybenzaldehyde dipping reagent of 1% (v/v) in an acidic solution of sulphuric acid (98%, v/v) and acetic acid (96-98%, v/v) (respectively, 2% and 10%, v/v in alcohol-water, 60:30, v/v), presenting a purple color against a slightly colored background.

Author(s): 
Gabriëls, M.
Plaizier-Vercammen, J. A.
Publication Title: 
Journal of Chromatographic Science

In this study a clear separation between seven analogues of artemisinin on thin-layer chromatography (TLC) is presented. The developed TLC method is carried out on a RP-C18 thin-layer plate using acetonitrile-water (50:25 v/v) as the mobile phase. Spots are visualized by derivatization with an acidified 4-methoxybenzaldehyde reagent in methanol-water.

Author(s): 
Gabriëls, M.
Plaizier-Vercammen, J.
Publication Title: 
Journal of AOAC International

Ocimum sanctum (family Lamiaceae) is a reputed drug of Ayurveda, commonly known as Tulasi. In the present work, we quantified 4 marker compounds, viz., eugenol, luteolin, ursolic acid, and oleanolic acid, from the leaf of green and black varieties of O. sanctum using high-performance thin-layer chromatography (HPTLC) with densitometry.

Author(s): 
Anandjiwala, Sheetal
Kalola, Jyoti
Rajani, Mandapati
Publication Title: 
Journal of AOAC International

The present study aimed to standardize the Ayurvedic preparation Haridra Khanda containing Curcuma longa as a major ingredient. Various physicochemical parameters such as alcohol-soluble extractive, water-soluble extractive, total ash, and acid-insoluble ash were determined according to the Ayurvedic Pharmacopoeia of India. Microscopic evaluation of the formulation revealed the presence of various diagnostic cell structures of C. longa. Trace metal analysis indicated the absence of toxic metals such as As, Cd, Hg, and Pb.

Author(s): 
Rout, Kedar Kumar
Parida, Sagarika
Mishra, Sagar Kumar
Publication Title: 
Pakistan journal of biological sciences: PJBS

Withania somnifera (L.) Dunal. (Family: Solanaceae) is a therapeutically important medicinal plant in traditional and Ayurveda systems of medicine in Sri Lanka. Witheferin A, is a potential anticancer compound found in W. somnifera. In the present study, attempts have been made to compare witheferin A content, in different parts of (root, stem, bark, leaf) two varieties of (LC1 and FR1) W. somnifera grown in same soil and climatic conditions. Ground sample (1g) of leaves, bark, stem and roots of two W. somnifera varieties were extracted with CHCl3 three times.

Author(s): 
Siriwardane, A. S.
Dharmadasa, R. M.
Samarasinghe, Kosala
Publication Title: 
Molecular Biology of the Cell

Increased expression of vascular endothelial growth factor (VEGF) contributes to the growth of many tumors by increasing angiogenesis. Although hypoxia is a potent inducer of VEGF, we previously showed that epidermal growth factor receptor amplification and loss of PTEN, both of which can increase phosphatidylinositol-3-kinase (PI3K) activity, increase VEGF expression.

Author(s): 
Pore, Nabendu
Liu, Shuang
Shu, Hui-Kuo
Li, Bin
Haas-Kogan, Daphne
Stokoe, David
Milanini-Mongiat, Julie
Pages, Gilles
O'Rourke, Donald M.
Bernhard, Eric
Maity, Amit
Publication Title: 
Journal of Musculoskeletal & Neuronal Interactions

OBJECTIVES: Preterm infants are born with low bone mineral. Neonatal stress further impedes bone mineralization. Clinical evidence suggests that tactile and kinesthetic stimulation (TKS) improves bone phenotype and decreases stress response. Clinical and translational studies indicate the IGF-1 axis, responsible for postnatal growth and bone mineralization, is a key player. We hypothesized that TKS would attenuate the negative impact of neonatal stress on bone phenotype and the IGF-1 axis in weanling rats.

Author(s): 
Haley, S.
Gulliver, K.
Baldassarre, R.
Miller, S.
Lane, R. H.
Moyer-Mileur, L. J.
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