ILUNGA CIUMA Calvin1, TSHIOMBE MULAMBA Van Emery2, BULUBULU OTONO Freddy1, NYEMBO KIBANGA Beaudouin3, MUAMBI NKATE Jean Louis3, MUKENDI MUKENDI Joël4, MUYA ITUNGA Moïse1, MBUYI MUSADI Chantal5, MAKUN ANTHONY Hussaini6.

Mycotoxins in Foods Consumed Kinshasa, Democratic Republic of the Congo (DRC)

Food security is a concept that takes into account not only the number of food products available but also the qualitative aspects. The Democratic Republic of Congo (DRC), like many developing countries, faces these two challenges, the quantitative insufficiency of agricultural production on the one hand, and the problem of the quality of food products marketed. Among the problems that affect the quality of food sold and consumed in Kinshasa are the microbiological quality and the presence of food contaminants, of which mycotoxins occupy an important place. Despite the heavy toll these contaminants impose on the population and the national economy, no national policy for their management exists in the country, let alone a law regulating them. The scarce research carried out on mycotoxins in foods consumed in Kinshasa has been directed towards aflatoxins and the information they present is fragmentary. The aim of this study is to take stock of the state of research carried out on food mycotoxins in foodstuffs consumed in the DRC, more precisely in the city province of Kinshasa, with a view to contributing to the establishment of a national management policy. of these food contaminants. Télécharger l'article

SEKE VANGU Max*, PHUKU PHUATI Edmond, EFOTO EALE Louis, MBOSEI LOBOTA Albert,MUANDA NGIMBI Robert.

Chemical and Mineralogical Characterizations by x-Rays and Monitoring of the Grindability of Clinker, Dolerite, Basalt and Metabasalt from Kongo-Central for Cement Application.
This study reports chemical and mineralogical characterization and grindability for cement purposes, of four rocks, namely: Clinker, a Dolerite, Basalt and a Metabasalt from the KongoCentral province. The compositions are determined with X-rays by spectroscopy and diffraction respectively, and grindability by means of a ball mill and Blaine permeabilimetter. The clinker is classified belitic due to its LSF factor, in the Bogue formula and the diffraction results. The tri and dicalcium silicates represent 32% and 56% respectively. These natural rocks fulfill the first condition of pozzolanicity and offer lime contents favorable for clinker substitution in the formulation of a compound cement. The minerals in the samples are: the calcium albite, the clinopyroxene, the amphibol called actinolite, a non-asbestiform variety, the epidote, the chamosite, the calcium olivine called larnite, the Hatrurite, Dioptase, Brownmillerite, biotite. Grindability shows that the clinker is hard to grind, followed by the rock of site-3, it’s harder than those two others. The Peter Von Rittinger relationship is followed at the very beginning of the grinding and with the low specific surface, at inflection of the curve appears following the incipient cohesive forces. Co-grinding and grinding ads are a solution to optimize communition. These three natural rocks can be used as a clinker substitutes. Télécharger l'article

MFELE NTSA Jeanine, KILEMBE THAMBWE Jason, NTUMBA KANKOLONGO Joséphine, TABA KALULU Muzele, TSHIONGO MUAMBA T. Christian*

Synthesis, Antibacterial Activity Evaluation and Structure-Activity Relationship Study of Some Ibuprofene Analogues
In order to highlight the various electronic, steric and lipophilic contributions responsible for the antibacterial activity of Ibuprofen, we studied the structure-activity relationship of some synthetic analogues of Ibuprofen. Those analogues were synthesized and characterized. The antibacterial activity was evaluated by microdilution method using Staphylococcus aureus and Pseudomonas fluorescens as strains. Evaluation of the influence of structural modifications on biological activity (antibacterial activity) shows that electronic contributions (calculated by the software Chemdraw and Gaussian) were the major property influencing the antibacterial activity. The ethyl ester derivate highlighted the lipophilic contribution. The nitro derivate obtained with 69% yield showed the best antibacterial activity. This analog can be a starting point for the development of a generation of antibacterial based on Ibuprofen structure. Télécharger l'article

MWELO LINGEBA Jules1*, NGIMBA Michel1, NZINGULA PHASI Olivier1, LUVANDU MBENZA Maguy3, MISENGABU MBUYAMBA Nicole 2, KODONDI KULE KOTO Fridolin1

HIV Prevalence in Premarital Examinations
HIV is a retrovirus that causes acquired immunodeficiency syndrome in humans. This is a global public health problem. In this study, we determined the prevalence of HIV in pre-marital exams in the city of Kinshasa. Hundred sixty seven (167) subjects participated in this study for pre-marital examinations at the Biochemistry - Hematological Laboratory of the Faculty of Pharmaceutical Sciences of the University of Kinshasa from January 2019 to March 2019. HIV diagnosis was done by combining two methods: TDR.-determine as a basic test and TDR.-Unigold as a confirmation test. HIV prevalence was assessed based on TDR.-Unigold results. TDR.- determine showed that 8 of 167 subjects were positive . The TDR.- Unigold performed on the 8 positive subjects with TDR.-Determine revealed that only 3 of the 8 positive subjects were positive. HIV prevalence in this study, based on TDR.-Unigold results, is 3/167 or 1.8%. This study shows that HIV remains a major public health problem for which action must be taken for the entire population, including people presenting for premarital tests. Télécharger l'article

KAKA di MAKWALA Alain1*, KALONJI MBUYI Adrien2, MASIALA MUANDA Gabriel3, MUFWAYA KAKA Clarisse4

Influence of Palm Oil Nuts Thickness (elaeisguineensis jacq.) on Germination and Growth of Seedlings in Nursery
Installation program of palm plantations with a hybrid of short size, early vegetable material and of good productivity arouse a keen interest with the growers. The objective of the present study is to observe three categories of palm tree seeds to see the impact of their size on germination as well as growth of the seedlings in pre-seedbed. The test was carried out on Palm tree seeds left again in 3 batches of 130 seeds of which larges (of diameter > 2,5 cm), the averages (variable diameter between 1,5 with 2,5 cm), and the small seeds (diameter <1,5 cm) by using the method of germination by dry heat or DRY HEAPEDTRAITED (DHT). For the crossing (a), the small seeds had a rate of germination higher compared to seeds of average size or large seeds. The rate of germination was respectively 66,1%;16,2 % and 12,3 %. This tendency was the same for the crossing (b). For this latter, the rate of germination was respectively 84,6; 66,1 and 57,7 %. In term of performance treatment 1 came at the head with a diameter to the collet 27,31 cm, followed from 4 with 24,32 cm; 5 with 23,30 cm; 2 with 23,28 cm and 3 and finally treatment 6 per 23,14 and 17,90 cm respectively. Thus, we concluded that seeds age influence germination and the growth of the seedlings. Télécharger l'article

MBENGA IBESOA José*, MUMBERE NGUNGUTA Joel, LUMPUNGU KABAMBA Christophe

Silvicultural Assessment of the Plantations of Entandrophragma utile and angolense, Aucoumea klaineana and Nauclea diderrichii in the Luki Biosphere Reserve, in the DRC
The Luki Biosphere Reserve is a reference site that meets demonstration needs, on which, silvicultural experiments aimed at the sustainability of forests have been deployed, for more than fifty years. It is part of the international networks monitoring the performance of trees, forest dynamics and phenology of multiple forest species. In this paper, we made a diagnosis of silvicultural experiments in the Luki forest reserves by studying the behaviour of species in forest plantations. We carried out an inventory to count the species and take the various dendrometric parameters. The inventory was carried out on an area of 0.1 ha for the planting of Entandrophragma, 0.264 ha for the planting of Nauclea diderrichii and 0.7 ha for the planting of Aucoumea klaineana. The results showed that all three plantations have high mortality rates; this proves their state of abandonment: 73.4% for Entandrophragma angolense and 88.8% for Entandrophragma utile; 70.34% for Nauclea diderrichii and 72.33% for Aucoumea klaineana. The average annual increase in diameter is 0.21 cm for the species Entandrophragma, 0.6 cm for Nauclea diderrichii and 0.62 cm for Aucoumea klaineana. There is therefore the need to control forest stands to determine the density of trees, study the causes of mortality, and prescribe appropriate silvicultural remedies. Télécharger l'article