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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Journal of Scientific Research and Reports
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2320-0227
Published by SCIENCEDOMAIN international Homepage  [65 journals]
  • Determination of the Execution Time of Down Tapping Allowing a Good
           Performance of Agrophysiological Parameters in Reverse Tapping of Fast
           Metabolizing Rubber Clones PB 260 and IRCA 18

    • Authors: Moro Affia Perpétue, Kouakou N’guessan Kan Pulchérie, Atsin Guy Jöel Olivier, Diarassouba Moussa, Lehi Malydie Irénée, Koffi Antoine, Kouakou Tanoh Hilaire, Obouayeba Samuel
      Pages: 1 - 12
      Abstract: The classic latex harvesting system consists of top-down tapping for nine years before being immediately followed by reverse tapping. This period is often considered too long by the farmers. To address this concern, a study was conducted to determine the best period for down tapping to ensure good performance of agrophysiological parameters in reverse tapping of fast metabolising rubber clones. For this purpose, the PB 260 and IRCA 18 clones were used as plant material in Divo and Daoukro respectively, where the experiments were conducted. Five time frames for down-bleeding (5, 6, 7, 8 and 9 years = control) and two concentrations of ethephon (ET) stimulating paste (2.5 and 5% ET), except for the control which is stimulated only at 5% ET, were tested. The experimental design was a Fisher block design with 9 treatments and 4 replicates. Rubber productivity results (5262 ± 205 and 4951 ± 351 kg.ha-1.yr-1) showed that reverse tapping of these metabolically active clones preceded by 5 and/or 6 years of down tapping was the best (3723 ± 29 kg.ha-1.yr-1 ; control). Rubber production and average annual increment from these tapping periods (4.00 ± 0.42 and 3.60 ± 0.00 cm.yr-1 ; control) were the highest. Productivity gains were 41% for reverse tapping at 6 years stimulated at 5%. The dry notch rate was relatively low (3.30% LEM and 0% dry trees). The physiological profile was generally good. These results indicate that downward bleeding for 5 and/or 6 years allows these clones to express their best potential in reverse bleeding. These results are satisfactory and respond exactly to the concerns of the farmers.
      PubDate: 2022-06-23
      DOI: 10.9734/jsrr/2022/v28i830536
  • Impacts of the Exploitation of Rock Models on Phytodiversity in the
           Agbelouve Township and Its Surroundings

    • Authors: Awèdéo Maloukou, Minkilabe Djangbeja, Hodabalo Kamou
      Pages: 13 - 24
      Abstract: The exploitation of rocky outcrops is increasing and leading to the loss of biodiversity in the canton of Agbélouvé and its surroundings. This study aims to assess the impact of the exploitation of these rocks on the flora and vegetation, in order to contribute to the sustainable management of plant resources. It is based on floristic inventories of the exploitation sites and off-site. The collected data was processed by the Excel 2016 spreadsheet, and software XLSTAT 2008. The results of this research show that this activity is at the origin of the destruction of the vegetation cover and the modification of the topographic landscape.  234 species were recorded in 96 surveys, including 95 species belonging to 41 families on the exploitation sites, compared to 139 species belonging to 51 families off-site.  The Shannon diversity indexes are 1.86 and 2 respectively on and off sites. Pielou's equitability index is 0.94 on the exploitation sites and 0.93 off-site.  The analysis of the biological spectrum shows the predominance of phanerophytes (60.76%) off sites against (37%) therophytes on the exploitation sites.  The analysis of the phytogeographical spectrum indicates the predominance of Afro-tropical species on the two sites explored. Faced with the negative impacts of the exploitation of the rock formations on the vegetation, it is necessary to take measures for the restoration of the exploitation sites.
      PubDate: 2022-06-25
      DOI: 10.9734/jsrr/2022/v28i830537
  • In-vitro Activity of Medicinal Plant Crude Extract and In-vivo Toxicity
           Testing of Dichloromethane Root Extract of Citrus limon in laboratory

    • Authors: S. O. Guya, Eliud N. M. Njagi, A. N. Guantai, Caroline C. Langat-Thoruwa, Grace Murilla, Richard Kurgat, Sylvance Okoth, Judith Chemuliti, C. I. Muleke
      Pages: 25 - 56
      Abstract: Aims: To identify viable phytomedicines traditionally employed for the treatment of malaria in Kenya that could be developed into antimalarial agents. Study Design: Quantitative analysis of antiplasmodial activities and brine shrimp bioassays were carried out using standard procedures. The experiment was set in duplicate for each concentration of the drug and average IC50 determined. Place and Duration of Study: Seven indigenous plants: Achyranthes aspera, Heinsiacrinita, Bridelia cathartica, Citrus limon, Microglossapyrifolia, Vernoniaglabra and Carissa edulis obtained from Kilifi and Homa-Bay counties in Kenya were evaluated for their anti-Plasmodium falciparum potential. Collection of samples and analysis took about three months from April 2018. Methodology: Both Chemical and aqueous crude extraction methods were carried out to identify the most active extracts against P. Falciparum and then isolate pure active phytochemicals. Pure compounds were subjected to Nuclear Magnetic Resonance (NMR), Infra-Red (IR) and Mass Spectroscopy (MS) analyses for structure elucidation. Results: Four extracts (hexane, dichloromethane (DCM),methanoland water) of seven different species of plants were analyzed for their anti-plasmodial activities.W2 and D6 strains of Falciparum were tested. However, the three most active extracts were from Citrus lemon roots (DCM) with IC50 value of 7.017 µg/mL, C. edulis root (aqueous) with IC50 value of 8.054 µg/Ml and B. Cathertical eaves (methanol) with IC50 value of 15.647 µg/Ml. However, three pure compounds were obtained; suberosin IC5026.7 (Strain W2), 53.1 (Strain D6) and xanthyletin IC501580 (Strain W2) from C. limon (DCM) and spinasterol IC50 43.2 (Strain W2) from M. pyrifolia (hexane). Conclusion: The three different species of plants with most active compounds have demonstrated their potentiality in treatment for falciparum malaria. Structures of the isolated three compounds can be modelled to synthesis of anti- plasmodial drugs as they are active in vitro.
      PubDate: 2022-06-29
      DOI: 10.9734/jsrr/2022/v28i830538
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