African Journal of

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12218

Table of Content: 29 November; 9(48)

November 2010

Epigenetic polymorphisms could contribute to the genomic conflicts and gene flow barriers resulting to plant hybrid necrosis

  The fundamental molecular basis for phenotypic and genetic similarities among many described cases of plant hybrid necrosis has not been fully described. Plants can be good models for studying the basis of such gene flow barriers which occur between species. Many studies in prezygotic barriers like stigma recognition of pollen, environmental adaptation differences and pollinator preferences which can...

Author(s):   Josphert N. Kimatu, and Liu Bao  

November 2010

Angiotensin-converting enzyme gene I/D polymorphism in Pakistani systemic lupus erythematosus patients

  Angiotensin-converting enzyme (ACE) was first identified as a key component of the rennin-angiotensin system, as its main role is to process angiotensin I to angiotensin II and degrade bradykinin. Human ACE maps to chromosome 17q23 spans 21Kb, includes 26 exons and 25 introns. In humans, ID, DD, and II polymorphism is located in intron 16 of the angiotensin gene. The purpose of this study is to investigate...

Author(s): Hussain N, Jaffery G, Hasnain S and Anjum Nasim Sabri  

November 2010

Ethanol inducible isopentenyl transferase as a high efficiency marker for tobacco transformation

  The isopentenyl transforase gene from Agrobacterium tumefaciens is one positiveselectable marker genes for plant transformation. In this research, the ipt gene was placed under the control of ethanol-inducible system and was introduced intoNicotiana tabacum cv. Xanthi via Agrobacterium-mediated transformation. On a hormonefree medium (MSI) with 0.1% ethanol vapor, a large...

Author(s):   Litang Lu,, Youyin Zhu, Yang Liu,, Degang Zhao,  

November 2010

Genetic diversity of cowpea (Vigna unguiculata L. Walp) cultivars in Burkina Faso resistant to Striga gesnerioides

  The genetic diversity and phylogenetic relationships among cowpea (Vigna unguiculata L. Walp) genotypes used in breeding for resistance to Striga gesnerioides in Burkina Faso have been evaluated using simple sequence repeat(SSR) molecular markers. Sixteen primer combinations were used to polymerase chain reaction (PCR) amplify SSRs from 16 different cowpea genotypes yielding...

Author(s):   Mahamadou Sawadogo, Jeremy T. Ouedraogo, Bhavani S. Gowda and Michael P. Timko  

November 2010

Allelopathic appraisal effects of straw extract wheat varieties on the growth of corn

  Allelopathy is a process in which secondary metabolites produced by plants, micro-organisms, viruses and fungi control growth and development of other biological systems. Some plants may beneficially or antagonistically affect other plants through allelochemical compounds which may be released directly or indirectly from live or dead parts and cause allelopathic and phytotoxic effects. In Kerman province of...

Author(s):   Mehri Saffari⊃, Vahid Reza Saffari⊃ and M. H. Torabi-Sirchi⊃  

November 2010

Sodium chloride causes variation in organic acids and proteins in tomato root

  Tomato is a salt-tolerant crop. The purposes of this research are to evaluate changes of organic acids and proteins in tomato grown in environment of different NaCl concentrations (0, 0.25 and 0.5%, respectively). The results showed that oxalic acid, malic acid, fumaric acid and proteins in which P69C, Cytochrome P450 proteins, Lucinerich protein, phototropin-1 and retrotransposon gag protein were upregulated...

Author(s):   Jen-Hshuan Chen and Yong-Hong Lin  

November 2010

Plant regeneration via somatic embryogenesis from root explants of Hevea brasiliensis

A system for induction of callus and plant regeneration via somatic embryogenesisfrom root explants of Hevea brasiliensis Muell. Arg. clone Reyan 87-6-62 was evaluated. The influence of plant growth regulators (PGRs) including 2,4-dichlorophenoxyacetic acid (2,4-D), 6-benzylaminopurine (6-BA) and kinetin (KT) on callus induction of root explants from in...

Author(s):   Quan-Nan Zhou, Ze-Hai Jiang, Tian-Dai Huang, Wei-Guo Li, Ai-Hua Sun, Xue-Mei Dai and Zhe Li   

November 2010

Biochemical and quality parameters changes of green sweet bell peppers as affected by different postharvest treatments

  In this research, the effects of different postharvest treatments on quality and biochemical properties of “Maxibell F1” California Wonder type peppers at green mature stage were determined. In this content, ultraviolet C (UV-C) at 254 nm treatments for 2.5, 5, 10 min and hot water dipping (HWD) treatments for 2 min at 40, 50, 60°C were done respectively. Besides, low density polyethylene...

Author(s):   Mustafa Sakaldaş and Kenan Kaynaş  

November 2010

Possible application of differential global positioning system (DGPS) to harvesting date and precision viticulture

  From 2004 to 2008, the maturity of grapevine (Vitis vinifera L.) was researched on the basis of sugar content and total titratable acidity at six locations with an undulating topography in three varieties: 'Chardonnay', 'Riesling' and 'Sauvignon'. All sampling points were geo-referenced simultaneously with differential global positioning system (DGPS) for creating sugar...

Author(s):   D. Stajnko, B. Pulko and J. Rakun  

November 2010

Biosorptive removal of cobalt (II) ions from aqueous solution by Amaranthus hydridus L. stalk wastes

  The objective of this study was to investigate the possibility of using Amaranthus hybridus L. stalk as an alternative to high cost commercial adsorbent materials for the removal of Co (II) from aqueous solution. The experiment was carried out by batch method at 33°C. The influence of pH, contact time and initial metal ion concentration were evaluated. It was observed that pH had marked effect...

Author(s):   Egila, J. N., Dauda, B. E. N. and Jimoh, T.  

November 2010

Biological activities of Peganum harmala leaves

  Ethyl acetate, chloroform, butanol and methanol extracts of the leaves of Peganum harmala were tested for antibacterial, antioxidant and antiviral activities. The antibacterial activity was evaluated by the determination of minimum inhibitory concentration (MIC) using the solid medium technique. The antiviral activity was evaluated against human cytomegalovirus (HCMV) strain AD-169 (ATCC Ref. VR...

Author(s): Edziri Hayet, Mastouri Maha, Matieu Mata, Zine Mighri, Gutman Laurentand Aouni Mahjoub

November 2010

Batch adsorption technique for the removal of malachite green and fast green dyes by using montmorillonite clay as adsorbent

  Due to the major environmental problems of colorants in the present study, the removal of malachite green and fast green dyes were studied on montmorillonite clay adsorbent under optimized conditions. The concentration of dyes, amount of adsorbent and agitation time was optimized. Spectrophotometric technique was adopted for the measurement of concentration of dyes before and after adsorption. The adsorption...

Author(s): Hajira Tahir, Uzma Hammed, Muhammad Sultan and Qazi Jahanzeb  

November 2010

Biochemical changes in low-salt solid-state fermented soy sauce

  Low-salt solid-state fermentation soy sauce was prepared with defatted soy bean and wheat bran. Biochemical changes during the aging of the soy sauce mash were investigated. Results showed that after a 15-day aging period, the contents of total nitrogen, formol titration nitrogen, free amino acids, reducing sugar, total sugar and the brown color were increased. However, pH was decreased during the...

Author(s): Zhang Yanfang

November 2010

Antioxidant effects of anthocyanins-rich extract from black sticky rice on human erythrocytes and mononuclear leukocytes

  The present study was aimed at determining the optimum dose of anthocyanins-rich extract (ARE) from Thai pigmented rice for its antioxidant effects. Three different methods of antioxidant analysis [Oxygen Radical Absorbance Capacity (ORAC) assay, Folin Cioculteau Phenol (FCP) assay and Vanillin assay] were used and the results obtained were excellently correlated (r > 0.98). Among red rice, black...

Author(s):   Warin Sangkitikomol, Tewin Tencomnao and Atittaya Rocejanasaroj  

November 2010

Curcumin inhibits invasion and metastasis in the human ovarian cancer cells SKOV3 by CXCL12–CXCR4 axis

  Effects of curcumin on invasion and metastasis in the human ovarian cancer cells SKOV3 and approach if this inhibitory effects are related with CXCL12–CXCR4 axis were carefully studied. SKOV3 cells were treated with 10, 25, 50 µmol/l curcumin for 24, 48 and 72 h. Proliferation of SKOV3 cells was measured with 3-(4,5-demethy-2-thiazolyl)-2,5- dephenyl-2H-tetrazolium-bromide (MTT) assay. Invasion...

Author(s):   MU Xiaoling, Zhao Jing, Xu Fang and Tang Liangdan  

November 2010

In vitro comparison of apical microleakage following canal obturation with lateral and thermoplasticized gutta-percha compaction techniques

  The purpose of this study was to compare apical microleakage following canal obturation with lateral and thermoplasticized gutta-percha compaction techniques.Ninety extracted single-rooted maxillary teeth were used in this study. Seventy teeth were randomly divided into two groups: One group was obturated by lateral compaction technique and the other was obturated by Obtura II (thermoplasticized gutta-percha...

Author(s): Saeed Rahimi, Siavash Savadi Oskoee, Shahriar Shahi, Ensiyeh Maljaei, Majid Abdolrahimi, Hadi Mokhtari and Ali Kazemi  

November 2010

The poor control of hypertension in China

  Hypertension is one of the most important modifiable risk factor for life-threatening diseases. In China, the percentages of those with hypertension that are aware, treated and controlled are unacceptably low. However, multiple factors contribute to this status. China’s experience demonstrates that health development does not automatically follow economic growth.   Key...

Author(s): Jiayi Li and Haichang Wang

November 2010

Classification of EC bacterial true lipases using phylogenetic analysis

Lipases play an important role in lipid metabolism and are produced by a variety of species. All lipases are members of the α/β hydrolase fold super-family. Also, lipases share a conserved active site signature, the Gly-Xaa-Ser-Xaa-Gly motif. To obtain an overview of this industrially and very important class of enzymes and their characteristics, we collected and classified bacterial lipases sequences...

Author(s): Abdelmonaem Messaoudi, Hatem Belguith, Imen Gram and Jeannette Ben Hamida  

November 2010

Zooplankton composition of Van Lake Coastline in Turkey

  This study was completed with periodical surveys in coastal band of Van Lake between May and September in 2005 to 2006 period. It was carried  out on a total of 20 sites selected as sampling points and having three distinct characteristics. During the study, a total of 20 species (14 belonged to genus of Rotifera, 4 to Copepoda and 2 Branchiopoda) were found at the Van Lake coastal zone....

Author(s):   Şükran Yildiz, Mehmet Salih Özgökçe, Fevzi Özgökçe, İsmail Karaca and Evin Polat  

November 2010

Reproduction performance of Saanen goats raised under extensive conditions

  This research was conducted to determine some reproductive characteristics and kids’ growth characteristics of Saanen goats raised at Suleyman Demirel University Sheep and Goat Testing Facility. The animal materials of this research consisted of 91 female goats in different ages. Estrous cycle length, first mating age, kidding age and gestation length were found as 21 day, 12.9 month, 9.7 month and...

Author(s): Duygu Ince