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Multivariate Approach to Characterizing Soil Quality of Gabonese’s Ferralitic Soils

Open Journal of Soil Science 2024年第4期14卷 237-268页

作者： Neil-Yohan Musadji Rolf Gaël Mabicka Obame Michel Mbina Mounguengui jean aubin ondo Lydie-Stella Koutika Eric Ravire Claude Geffroy Laboratoire De Chimie Des Milieux et Des Mat&#233riaux Inorganiques Laboratoire D&#8217Analyse Des Sols et Environnement D&#233partement Des Sciences Fondamentales De L&#8217Ing&#233nieur Institut National D&#8217Agronomie et De Biotechnologies Universit&#233 Des Sciences et Techniques De Masuku Franceville Gabon Institut De Chimie Des Milieux et Maté riaux De Poitiers (IC2MP) Universit&#233 De Poitiers Poitiers France Laboratoire De Chimie Des Milieux et Des Mat&#233riaux Inorganiques Laboratoire D&#8217Analyse Des Sols et Environnement D&#233partement De Phytotechnologie Institut National D&#8217Agronomie et De Biotechnologies Universit&#233 Des Sciences et Techniques De Masuku Franceville Gabon Dé partement De G&#233ologie Facult&#233 Des Sciences Universit&#233 Des Sciences et Techniques De Masuku Franceville Gabon Laboratoire Pluridisciplinaire Des Sciences Ecole Normale Sup&#233rieure Libreville Gabon Centre De Recherche Sur La Productivité et La Durabilit&#233 Des Plantations Industrielles Pointe Noire Republic of Congo Sucaf Gabon Somdiaa Franceville Gabon

Assessing soil quality is essential for crop management and soil temporal changes. The present study aims to evaluate soil quality in the Ferralitic soils context countrywide. This assessment was done using multivariate soil quality indice (SQI) models, such as additive quality index (AQI), weighted quality indexes (WQIadd and WQIcom) and Nemoro quality index (NQI), applied to two approaches of indicator selection: total data set (TDS) and minimum data set (MDS). Physical and chemical soil indicators were extracted from the ORSTOM’s reports resulting from a sampling campaign in different provinces of Gabon. The TDS approach shows soil quality status according to eleven soil indicators extracted from the analysis of 1,059 samples from arable soil layer (0 - 30 cm depth). The results indicated that 87% of all provinces presented a very low soil quality (Q5) whatever the model. Among soil indicators, exchangeable K+ and Mg2+, bulk density and C/N ratio were retained in MDS, using principal component analysis (PCA). In the MDS approach, 50 to 63% of provinces had low soil quality grades with AQI, WQIadd and NQI, whereas the total was observed with WQIcom. Only 25% of provinces had medium soil quality grades with AQI and NQI models, while 12.5% (NQI) and 25% (AQI) presented high quality grades. Robust statistical analyses confirmed the accuracy and validation (0.80 r P ≤ 0.016) of AQI, WQIadd and NQI into the TDS and MDS approaches. The same sensitivity index value (1.53) was obtained with AQI and WQIadd. However, WQIadd was chosen as the best SQI model, according to its high linear regression value (R2 = 0.82) between TDS and MDS. This study has important implications in decision-making on monitoring, evaluation and sustainable management of Gabonese soils in a pedoclimatic context unfavorable to plant growth.

关键词： Gabon Ferralitic Soil Soil Indicators Standard Score Function Soil Quality Indices Sustainable Soil Soil Management

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National Soil Organic Carbon Stocks Inventories under Different Mangrove Forest Types in Gabon

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Open Journal of Forestry 2024年第2期14卷 127-140页

作者： Rolf Gaël Mabicka Obame Neil-Yohan Musadji jean Hervé Mve Beh Lydie-Stella Koutika jean aubin ondo Farrel Nzigou Boucka Michel Mbina Mounguengui Claude Geffroy Dé partement de Phytotechnologie Institut National d&#8217Agronomie et de Biotechnologies Universit&#233 des Sciences et Techniques de Masuku Franceville Gabon Dé partement des Sciences Fondamentales de l&#8217Ing&#233nieur Institut National d&#8217Agronomie et de Biotechnologies Universit&#233 des Sciences et Techniques de Masuku Franceville Gabon Institut Agronomiques et Forestiè res Centre National des Recherches Scientifiques et Technologiques Libreville Gabon Research Centre on the Durability and the Productivity of Industrial Plantations (CRDPI) Pointe Noire Republic of Congo Laboratoire Pluridisciplinaire des Sciences &#201cole Normale Sup&#233rieure Libreville Gabon Agence Gabonaise d’ &#201tude et d&#8217Observation Spatiale Immeuble les Arcades Libreville Gabon Dé partement de G&#233ologie Faculte des Sciences Universit&#233 des Sciences et Techniques de Masuku Franceville Gabon Institut de Chimie des Milieux et Maté riaux de Poitiers (IC2MP) Universit&#233 de Poitiers Poitiers France

Gabonese’s estuary is an important coastal mangrove setting and soil plays a key role in mangrove carbon storage in mangrove forests. However, the spatial variation in soil organic carbon (SOC) storage remain unclear. To address this gap, determining the SOC spatial variation in Gabonese’s estuarine is essential for better understanding the global carbon cycle. The present study compared soil organic carbon between northern and southern sites in different mangrove forest, Rhizophora racemosa and Avicennia germinans. The results showed that the mean SOC stocks at 1 m depth were 256.28 ± 127.29 MgC ha−1. Among the different regions, SOC in northern zone was significantly (p p −1) than upper layers (55.42 ± 25.37 MgC ha−1). The study highlights that low deforestation rate have led to less CO2 (705.3 Mg CO2e ha−1 - 922.62 Mg CO2e ha−1) emissions than most sediment carbon-rich mangroves in the world. These results highlight the influence of soil texture and mangrove forest types on the mangrove SOC stocks. The first national comparison of soil organic carbon stocks between mangroves and upland tropical forests indicated SOC stocks were two times more in mangroves soils (51.21 ± 45.00 MgC ha−1) than primary (20.33 ± 12.7 MgC ha−1), savanna and cropland (21.71 ± 15.10 MgC ha−1). We find that mangroves in this study emit lower dioxide-carbon equivalent emissions. This study highlights the importance of national inventories of soil organic carbon and can be used as a baseline on the role of mangroves in carbon sequestration and climate change mitigation but the variation in SOC stocks indicates the need for further national data.

关键词： Mangroves Forest Soil Organic Carbon Stocks Rizophora Racemose Avicenia germinans Gabon

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Macro-nutrients in edible parts of food crops in the region of Moanda,Gabon

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Agricultural Sciences 2012年第5期3卷 697-701页

作者： jean aubin ondo Richard Menye Biyogo Magloire Ollui-Mboulou Fran?ois Eba Joseph Omva-Zue Laboratoire pluridisciplinaire des sciences de l’Ecole Normale Supérieure B.P 17009 Libreville Gabon

The assessment of nutritive foodstuffs quality is an important step in the estimation of dietary intake of metals. This study aimed to assess accumulation and the daily intake of macro-elements magnesium, calcium, potassium and sodium in edible parts of plants grown in Moanda area. The ranges of concentrations were 246 - 5645 mg/kg, 1167 - 35105 mg/kg, 158 - 12563 mg/kg and 88 - 795 mg/kg for Mg, Ca, K and Na, respectively. Mg and K levels were significantly higher in fruits than in tubers. The trend of accumulation in the edible parts of plants was generally: Ca > K > Mg > Na. The daily intakes of Mg and Ca were the highest and indicated food crops in Moanda had a good nutritive quality.

关键词： Food Crops Macro-Nutrients Daily Intake Moanda

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Noninvasive Respiratory Strategies in Patients with Acute Hypoxemic Respiratory Failure and COVID-19 in Gabon: A Prospective Observational Study

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Open Journal of Emergency Medicine 2024年第1期12卷 18-27页

作者： Ghislain Edjo Nkilly Raphael Okoue ondo Fernande Manga Stéphane Oliveira jean Marcel Mandji-Lawson Romain Tchoua Department of Emergency Anesthesia Resuscitation Omar Bongo Ondimba Army Training Hospital Libreville Gabon Department of Anesthesia and Resuscitation Libreville University Hospital Center Libreville Gabon Department of Anesthesia and Resuscitation Akanda Army Training Hospital Libreville Gabon

Importance: The best respiratory support technique to reduce intubation and mortality in patients with respiratory failure due to COVID-19 is controversial. Objective: To determine the respiratory support technique that could reduce the need for tracheal intubation and mortality in patients with respiratory failure due to COVID-19 admitted to intensive care units (ICUs) of Military’s Hospital (HIAOBO) in Gabon. Design, Setting, and Participants-Methodology: Prospective observational study over 10 months (January 2021-October 2021). We included patients admitted to intensive care for SARS Cov2 pneumonia who had benefited from available ventilatory support: high concentration face mask, High Flow Nasal cannula (HFNC), NIV (Non Invasive Ventilation), Continuous Positive Airway Pressure (CPAP). The choice was guided by the clinical condition, and the choice of the prescribing physicians. Recourse to mechanical ventilation was decided when faced with a Glasgow score of less than 13, an SpO2/FiO2 ratio ≤ 300, a FR ≥ 35/min, the impossibility of drainage of secretions. Main Outcomes and Measures: The primary outcome was the proportion of patients requiring intubation. The secondary outcomes were mortality in ICU. Results: The sample included 97 patients, the average age was55.6 years, hypertension was the main comorbidity (51.1%). Mean respiratory rate (RR) was 30.8 cycles/min, admission SpO2 was 83%, respiratory alkalosis was present in 63% of patients, mean CT involvement was 51%.Respiratory support was NIV (56.7%), CPAP (21.65%), high concentration face mask (18.55%). Sixteen percent (16%) of patients were intubated, 93% of them following failure of NIV. Mortality was 30%, mechanical ventilation was an independent risk factor for mortality. Conclusions: Non Invasive Ventilation, CPAP, and high-concentration face mask were frequently used in patients with COVID-related acute respiratory failure. The CPAP has reduced the need for intubation. Mechanic

关键词： Respiratory Failure COVID 19-Intensive Care Units Military Hospital Gabon

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Postoperative Analgesia and Cesarean Section under General Anesthesia: Multicenter Study

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Open Journal of Anesthesiology 2024年第1期14卷 1-12页

作者： Ghislain Edjo Nkilly Raphael Okoue ondo Pascal Christian Nze Obiang Stéphane Oliveira jean-Marcel Mandji-Lawson Romain Tchoua Department of Anesthesia and Intensive Care Omar Bongo Ondimba Army Training Hospital (HIAOBO) Libreville Gabon Department of Anesthesia and Intensive Care Jeanne Ebori Fondation Libreville Gabon Department of Anesthesia and Intensive Care Akanda Army Training Hospital Libreville Gabon

Background: Neuraxial anesthesia with intrathecal morphine is the reference technique in cesarean section anesthesia for the management of postoperative analgesia. If there is a contraindication to this, general anesthesia is required. The objective of the study was to evaluate the analgesic effectiveness of 4 analgesic techniques performed during cesarean section under general anesthesia in two centers with different anesthetic practices (North Franche Comté Hospital and Omar Bongo Ondimba Army Training Hospital). Method: This is a retrospective and descriptive study over 2 years, from January 1, 2019 to December 31, 2020. It involved evaluating the analgesic effectiveness and tolerance of morphine in the epidural catheter, wound infiltration, intravenous analgesia and Transversus Abdominous Plane block (TAP block) from the post-anesthesia care unit (PACU) until the 4th post-operative day. Results: Of the 354 cesarean sections performed, 84 (11.14%) received general anesthesia. The average age was 32.27 years. Acute fetal distress was the first indication for cesarean section (45.2%), followed by hemorrhagic placenta previa (10.7%) and prolapse of the cord (8.33%). Morphine in the epidural catheter was the most used (47.6%) followed by parietal infiltration (36.9%), intravenous analgesia (13.1%) and TAP block (2.38%). The analgesic effectiveness was comparable between the techniques from postoperative day 0 to day 4. No difference in side effects. Postoperative morphine consumption was significantly reduced (p = 0.011) in the infiltration (9 mg) and TAP block (9mg) groups compared to the epidural catheter (16 mg) and intravenous analgesia (17 mg). No difference in 02 rehabilitation criteria (ambulation, first bowel movement). No difference in the occurrence of chronic pain. Conclusion: In the event of a cesarean section under general anesthesia, there are effective and well-tolerated alternatives to neuraxial anesthesia, particularly regional anesthesia

关键词： Cesarean General Anesthesia Morphine Parietal Infiltration Epidural Catheter Transversus Abdominis Plane Block Intravenous Analgesia

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Intermediate Hip Arthroplasty in Gabon: Blood Loss and Risk Factor for Transfusion

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Open Journal of Anesthesiology 2024年第4期14卷 109-117页

作者： Ghislain Edjo Nkilly Pascal Christian Nze Obiang Raphael Okoue ondo Arthur Matsanga Stéphane Oliveira Léandre Nguiabanda jean-Marcel Mandji-Lawson Department of Anaesthesia and Intensive Care Omar Bongo Ondimba Army Training Hospital (HIAOBO) Libreville Gabon Department of Anaesthesia and Intensive Care Jeanne Ebori Fondation Libreville Gabon Department of Anaesthesia and Intensive Care Owendo University Hospital (CHUO) Libreville Gabon Department of Anaesthesia and Intensive Care Akanda Army Training Hospital Libreville Gabon Orthopedic Surgery Service Omar Bongo Ondimba Army Training Hospital (HIAOBO) Libreville Gabon

Background: Hip arthroplasty is a surgery with a high risk of bleeding. The main objective of this study was to research risk factors for bleeding and transfusion in patients undergoing hip hemiarthroplasty in Gabon. Method: It was a retrospective, monocentric, descriptive and analytical study carried out from June 2011 to June 2021 at the Omar Bongo Ondimba army training hospital. The variables studied were demographic characteristics, biological variables, transfusion and intraoperative data. The primary outcome was intraoperative transfusion. A univariate and multivariate analysis was conducted to identify the factors associated with the occurrence of a transfusion. Results: Of the 97 patients included, the average age was 74.2 years ± 10, male predominance was 73.2%, the average ASA score was 1.9 ± 0.5, and transfusion incidence was 38.1%. The average number of RBCs transfused was 1.2 ± 0.6. Tranexamic acid was used in 11.3% of patients. The average bleeding was 450 ± 453 ml. Preoperative anemia was predictor of transfusion to be significant. Conclusion: The incidence of transfusion is law compared to total hip arthroplasty. The implementation of a patient blood management protocol is difficult given the urgency of bone repair. However, a better use of tranexamic acid could reduce this transfusion incidence.

关键词： Hip Arthroplasty Risk Factors Patients Hemiarthroplasty Gabon

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The Epidemiological Profile of Acute Peritonitis and Sensitivity to Antibiotics, about 167 Cases, in the General Surgery Department of the Amissa Bongo Regional Hospital Center in Franceville, Gabon

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Surgical Science 2022年第6期13卷 307-316页

作者： Silvère Ngakani Offobo Hilaire Nyamatsiengui Louis Clément Obame Kundulunga jean Albert Aseke François ondo N’Dong General Surgery Department Amissa Bongo Regional Hospital Franceville Gabon Akanda Armed Forces Instructions Hospital Libreville Gabon Laboratory Larebio University of Sciences Masuku Franceville Gabon Radiology Department Amissa Bongo Regional Hospital Center Franceville Gabon Department of Surgery Libreville University Hospital Center Libreville Gabon

The objective of this study is to determine the epidemiological, clinical, paraclinical, therapeutic aspects, and the sensitivity to antibiotics for acute peritonitis at CHRAB Franceville. This was a prospective, descriptive and analytical study, between September 2015 and December 2021. Generalized acute peritonitis was one of the digestive surgical emergencies. There were 167 patients operated on for acute peritonitis, including 116 men (69.46%) and 51 women (30.34%). The majority of patients came from Franceville (n = 62) 37.12%. The average age was 33.4 years (extreme 4 years and 75 years). The admission time was on average +6.15 or -6.54 hours. The main etiology was acute appendicitis with (n = 122) 73.05%, followed by gastric perforations (n = 26) 15.56%, bowel perforations (n = 5) 2.99%. Some post-surgical cases (n = 4) 2.39%. Biological examinations found: hyperleukocytosis in 64.67% of cases, anemia in 52.9% of cases, and hematocrit down in 28.3% of cases. Ultrasounds found 17.36% peritoneal effusions and 12.57% acute appendicitis. The abdomen without preparation revealed 13.17% cases of pneumoperitoneum. Anatomy pathology found acute appendicitis, gastroduodenal ulcers, peritoneal tuberculosis, and peritoneal carcinomatosis. Biliary drainage choledotomy with Kher drain, supernumerary spleen splenectomy, hysterectomy. The average duration in intensive care was 6.5 days with extremes of 5 to 10 days. The average stay in inpatient surgery was 10.8 days. Isolated or combined antibiotic therapy was the rule. Postoperative follow-up at 1 month was systematic. Parietal suppuration was the main complication. We had recorded 2 cases of fistula and 4.19% of deaths.

关键词： Peritonitis Etiologies Laparotomy Germs Susceptibility Antibiotics

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Frequency of Transfusions and Risk Factor for Bleeding Risk to Guide a Blood-Sparing Program during Hip Arthroplasty in Gabon

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Open Journal of Anesthesiology 2023年第3期13卷 47-57页

作者： Ghislain Edjo Nkilly Raphael Okoue ondo Arthur Matsanga Pascal Christian Nze Obiang Stéphane Oliveira Léandre Nguiabanda jean-Marcel Mandji-Lawson Romain Tchoua Department of Anaesthesia and Intensive Care Omar Bongo Ondimba Army Training Hospital (HIAOBO) Libreville Gabon Department of Anaesthesia and Intensive Care Owendo University Hospital (CHUO) Libreville Gabon Department of Anaesthesia and Intensive Care Jeanne Ebori Fondation Libreville Gabon Department of Anaesthesia and Intensive Care Akanda Army Training Hospital Libreville Gabon Orthopedic surgery service Omar Bongo Ondimba Army Training Hospital (HIAOBO) Libreville Gabon

Background: Hip arthroplasty is a surgery with a high risk of bleeding. The main objective of this study was to research risk factors for bleeding and transfusion in patients undergoing hip arthroplasty in order to guide a blood-saving program. Method: Retrospective, monocentric, descriptive and analytical study carried out from June 2011 to June 2021 at the Omar Bongo Ondimba army training hospital. The variables studied were demographic characteristics, biological variables, transfusion data, anesthetic and intraoperative data. The primary outcome was intraoperative or postoperative transfusion. A univariate and multivariate analysis was conducted to identify the factors associated with the occurrence of a transfusion. Results: Of the 276 patients included, 179 benefited from Total Hip Prosthesis (THP) and 97 from Intermediate Hip Prosthesis (IHP). Spinal anesthesia was performed in 67.4% of patients. The ASA 2 score predominated (65.9%). The transfusion incidence was 56.9% (157/276). Tranexamic acid was used in 16.3% (45/276) of patients. The average bleeding was 528 ± 405 ml. Preoperative anemia (OR = 0.78, 95% CI [0.66 - 0.91]) and total hip prosthesis (OR = 2.02 95% CI [1.11 - 3.67]) were predictors of bleeding and transfusion to be significant. The average serum hemoglobin predictive of a transfusion was 11.6 ± 1.8. ASA score and operative time were not found as risk factors for bleeding and transfusion. Conclusion: The incidence of transfusion is high. Preoperative anemia remains a major but modifiable risk factor unlike the choice of implant. The implementation of a patient blood management protocol could reduce this transfusion incidence.

关键词： Arthroplasty Hip Gabon Transfusion

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Erectile Dysfunction: Clinical and Epidemiological Aspects in Senegal

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Open Journal of Urology 2015年第9期5卷 147-154页

作者： Yoro Diallo Racine Kane Saint Charles Kouka Boubacar Fall Cyrille Ze ondo Abdoulaye N’Diaye Adamson Phiri Amadou Sékou Soumah Babacar Diao Cheickna Sylla Department of Urology Faculty of Health Sciences University of Thies Thies Senegal Department of Urology Principal Hospital Dakar Senegal Department of Urology Hospital Health Teaching Aristide Le Dantec Dakar Senegal

Introduction: The objective of our study was to analyze the clinical and epidemiologic aspects of erectile dysfunction in subjects with different comorbidities in Senegal. Patients and Methods: This was a retrospective study over a period of 2 years on patients who presented themselves for consultation for erectile dysfunction. The study was carried out in the regions of Dakar and Thies at the Ouakam geriatric center and the Saint jean of god Hospital of Thies respectively. Results: We enrolled into the study 402 patients with erectile dysfunction. The average age of our patients was 47 ± 5 years. Patients aged more than 60 years were the most. The majority of our patients had less than secondary school level education, 211 in total representing 52.5% of the study population compared to 14.9% having post baccalaureate level. A large number of these patients had professional activities (53.3%), followed by retirees (29.6%). Polygamous patients were more in number (51.5%). In our study sample, we registered 120 active smokers (29.9%). A hundred and ten of our patients were sedentary for periods of 5 months to 22 years. The average length of time before seeking help for erectile dysfunction in our patients was 2.8 years. Severe erectile dysfunction was predominant in the smoking group (54.2%) compared to (9.9%) in the non-smoking group. We found a large proportion of severe and moderate erectile dysfunction (66.3%) and (31.7%) respectively in diabetic than non-diabetic patients. Severe erectile dysfunction was more in hypertensive and diabetics. Severe erectile dysfunction was more present in hypertensive plus smokers (83.9%) than in non-smoking hypertensive patients (68.6%). Severe ED was found more in hypertension and diabetic subjects. Conclusion: Erectile dysfunction is most frequently related on one side to socio-environmental factors, and to co-existing comorbidities on the other side.

关键词： Erectile Dysfunction Epidemiology Risk Factors Clinical

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African eggplant(Solanum anguivi Lam.)fruit with bioactive polyphenolic compounds exerts in vitro antioxidant properties and inhibits Ca^(2+)-induced mitochondrial swelling

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Asian Pacific Journal of Tropical Biomedicine 2013年第10期3卷 757-766页

作者： Olusola Olalekan Elekofehinti jean Paul Kamdem Aline Augusti Bolingon Margareth Linde Athayde Seeger Rodrigo Lopes Emily Pansera Waczuk Ige Joseph Kade Isaac Gbadura Adanlawo Joao Batista Teixeira Rocha Department of Biochemistry Adekunle Ajasin UniversityAkungbaOndo StateNigeria Postgraduate Programme in Biochemical Toxicology Department of ChemistryCCNE.Federal University of Santa Maria.Campus CamobiSanta MariaRS.97105-900Brazil Postgraduate Programme in Pharmaceutical Sciences Federal University of Santa MariaCampus CamohiSanta MariaRS97105-900.Brazil Toxicologia de Produtos Naturais e Sinteticos.Universidade Federal do Pampa CEP 97500-970 UruguaianaRSBrazil Department of Biochemistry Federal University of TechnologyAkureOndo StateNigeria Department of Biochemistry University of Ado EkitiEkiti State.Nigeria

Objective:To evaluate the antioxidant and radical scavenging activities of Solanum anguivi fruit(SAG)and its possible effect on mitochondrial permeability transition pore as well as mitochondrial membrane potential(△Ψ_m)isolated from rat ***:Antioxidant activity of SAG was assayed by using 2,2-diphenyl-1-picrylhydrazyl(DPPH),reducing power,iron chelation and ability to inhibit lipid peroxidation in both liver and brain homogenate of ***,the effect of SAG on mitochondrial membrane potential and mitochondrial swelling were *** and quantification of bioactive polyphenolics was done by ***:SAG exhibited potent and concentration dependent free radical-scavenging activity(IC_(50)/DPPH=275.03±7.8μg/mL).Reductive and iron chelation abilities also increase with increase in SAG *** also inhibited peroxidation of cerebral and hepatic lipids subjected to iron oxidative *** protected against Ca^(2+)(110μmol/L)-induced mitochondrial swelling and maintained the△Ψ_*** analysis revealed the presence of gallic acid[(17.54±0.04)mg/g],chlorogenic acid(21.90±0.02 mg/g),caffeic acid(16.64±0.01 mg/g).rutin[(14.71±0.03)mg/g]and quercetin[(7.39±0.05)mg/g].Conclusions:These effects could be attributed to the bioactive polyphenolic compounds present in the *** results suggest that SAG extract is a potential source of natural antioxidants that may be used not only in pharmaceutical and food industry but also in the treatment of diseases associated with oxidative stress.

关键词： Solanum anguivi fruit Antioxidant activity Oxidative stress Mitochondrial swelling HPLC Polyphenolic compounds MPTP

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