IJRDO - Journal of Biological Science (ISSN: 2455-7676) https://ijrdo.org/index.php/bs <p>IJRDO Journal of Biological Sciences is a peer-reviewed and open access journal dedicated to publish and disseminate the high quality scientific research work in the broad field of biological sciences. Scope of the journal includes: Cell biology, developmental biology, structural biology, microbiology, molecular biology &amp; genetics, biochemistry, biotechnology, biodiversity, entomology, toxicology, ecology, freshwater biology, marine biology, environmental Biology, plant biology, Ethno-medicines and bioinformatics.<br><span style="font-size: 1.5em;"><strong> <span style="color: #fcbd0f; text-shadow: #666666 0px 0px 3px;">Current Impact Factor: 2.557</span></strong></span></p> IJRDO Journal en-US IJRDO - Journal of Biological Science (ISSN: 2455-7676) 2455-7676 <p>Author(s) and co-author(s)&nbsp;jointly&nbsp;and severally represent and warrant that the Article is original with the author(s) and does not infringe any&nbsp;copyright or violate any other right of any third parties, and that the Article has not been published&nbsp;elsewhere.&nbsp;Author(s) agree to the terms that the <strong>IJRDO Journal</strong> will have the full right to remove the published article on any misconduct found in the published article.</p> Isolation , Partial Characterization of a Flavone From Sudanese Terminalia brownii (Comretaceae) Root and Biological Activity of Ethanol Extract https://ijrdo.org/index.php/bs/article/view/3179 <p><em>Terminalia brownii</em> is widely used in African system of medicine as a natural remedy for cough, tonsillitis, typhoid, tooth-ache, snake bite and rheumatic pain<em> . </em>Phytochemical screening of <em>Terminalia brownii </em>root rev<em>ea</em>led the presence of flavonoids , alkaloids,steroids, tannins, terpenes, saponins and coumarins. A flavonoid - compound I- was isolated from the ethanol extract by &nbsp;paper chromatography and its structure was partially characterized via some spectral data ( UV and <sup>1</sup>HNMR).In the agar diffusion bioassay,the ethanol extract showed significant activity against <em>Pseudomonas aeruginosa </em>and <em>Staphylococcus aureus. </em>It &nbsp;exhibited moderate activity against<em> Escherichia coli </em>and the yeast <em>Candida albicans</em> . It also showed moderate free radical scavenging capacity &nbsp;against stable DPPH radicals.</p> Mohamed Abdel Karim Ibrahim, M Mohamed,S. Ayda,Y Copyright (c) 2019 IJRDO - Journal of Biological Science (ISSN: 2455-7676) http://creativecommons.org/licenses/by-nc-nd/4.0 2019-08-30 2019-08-30 5 8 01 08 Isolation , Partial Characterization of a Dihydroflavonol From Sudanese Wetheria indica L.(Sterculiaceae) Stems and Biological Activity of the Ethanol Extract https://ijrdo.org/index.php/bs/article/view/3167 <p><span class="fontstyle0">Phytochemical screening of </span><span class="fontstyle2">Wetheria indica </span><span class="fontstyle0">stems revealed the presence of flavonoids, tannins steroids , saponins and alkaloids. A flavonoid - compound (I)- was isolated from ethanol extract by thin layer chromatography and its structure was partially characteized on the basis of its spectral data (IR, UV, NMR ). The ethanol extract of </span><span class="fontstyle2">Wetheria indica </span><span class="fontstyle0">stems was evaluated for antimicrobial activity and it showed moderate activity against all test organisms. Also the extract exhibited significant free radical scavenging capacity.</span></p> Mohamed Abdel Karim Nousiba,M. Dalia,O. Copyright (c) 2019 IJRDO - Journal of Biological Science (ISSN: 2455-7676) http://creativecommons.org/licenses/by-nc-nd/4.0 2019-08-30 2019-08-30 5 8 09 16 Anthropo-biological Theoretical Model of Teenage pregnancy of José Corona https://ijrdo.org/index.php/bs/article/view/3111 <p style="margin: 0px 0px 13.33px; text-align: justify; line-height: normal; text-indent: 35.4pt;"><span lang="EN-US" style="background: white; margin: 0px; color: black; font-family: 'Arial',sans-serif; font-size: 12pt;">This article describes an explanatory theoretical model of adolescent pregnancy in 3 succinct postulates, the product of 8 years of research in the field of sexuality in adolescents. However, the ideas of other models prior to this one were taken into account, which served as the basis for impregnating other ideas that allow a more described adolescent pregnancy phenomenon. This model is not universal, since the behavior of adolescents is heterogeneous and varies according to the context in which it operates and the decision making regarding their sexuality.</span></p> José Luis Corona Lisboa Copyright (c) 2019 IJRDO - Journal of Biological Science (ISSN: 2455-7676) http://creativecommons.org/licenses/by-nc-nd/4.0 2019-08-30 2019-08-30 5 8 17 27