Photomorphogenesis of a Red Alga (Acrochaetium)

Larpent, J. P.; Larpent-Gourgaud, M.; Ducher, Mireille; Jacques, R.

doi:10.1016/s0044-328x(78)80140-8

Cited by 5 publications

(3 citation statements)

References 1 publication

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“…Ten typical colonies are isolated from each sample from the Petri dishes containing the medium and subcultured in the nitritive broth and incubated at 30°C. For Gram staining, the procedure is that of [25,26].…”

Section: Methodsmentioning

confidence: 99%

Characterization of biochar enriched with compost tea, its effects and after-effects in continuous cultivation of maize (Zea mays L.) on a ferralsol of Lubuya Bera, Tshopo Province, R.D.Congo

MANGA¹,

Etiabilea²,

Dembo³

et al. 2023

Int. J. Sci. Res. Updates

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The cultivation of maize, the second crop after cassava in terms of consumption in the Kisangani region, is faced with edaphic constraints aggravated by itinerant slash and burn agriculture. Our study proposes the use of biochar enriched with compost tea to remove these constraints. The chemical characteristics of biochar are: 2.48 to 4.68 c. moL.g-1 for the acid functions; 0.64 to 1.03 c. moL.g-1 for basic functions; 8 for the pH at the point of zero load; 64 to 103% for retention capacity; 875.3 mg.g-1 for the iodine index. From a microbiological point of view, out of around thirty isolates, the majority of Gram-negative bacilli corresponding to the genera Nitrosomonas, Azotobacter and Nitrobacter were identified. The experimental site was arranged according to the Device in complete random blocks with 4 blocks and 4 plots of dimensions 6 m x 4.5 m each corresponding to the following 4 treatments: T0 (witness); T1 (Biochar over 2 mm in diameter); T2 (Biochar 2 mm in diameter); T3 (Biochar 2 mm in diameter and enriched with compost tea). The average yields obtained increase during 8 cropping seasons under all the treatments and vary from 2.38 t.ha-1 under T0 to 7.39 t.ha-1 under T3. They are relatively higher in the dry season than in the rainy season with an average increase of around 18% and a marginal rate of return for grain maize of 4.4 under T3. Compost tea-enriched biochar, due to its resilience, with substantial aftereffects is an important input for climate-smart agriculture.

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Section: Methodsmentioning

confidence: 99%

Characterization of biochar enriched with compost tea, its effects and after-effects in continuous cultivation of maize (Zea mays L.) on a ferralsol of Lubuya Bera, Tshopo Province, R.D.Congo

MANGA¹,

Etiabilea²,

Dembo³

et al. 2023

Int. J. Sci. Res. Updates

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“…Colors were determined according to ISCCNBS color charts (Kenneth and Judd 1976). The growth in the presence of NaCl was evaluated according to Larpent and Larpent Gourgaud (1997). The production of melanoid pigments was observed on ISP7 agar medium (15 g glycerol; 0.5 g L-tyrosine; 1 g L-asparagine; 0.5 g K2HPO4; 0.5 g MgSO4•7H2O; 0.5 g NaCl; 0.01 g FeSO4•7H2O; 1 mL standard saline solution; 18 g agar; 1,000 mL distilled water; pH 7.2) as described by Shirling and Gottlieb (1966).…”

Section: Cultural and Physiological Characteristicsmentioning

confidence: 99%

“…Hemolytic activity was tested using Columbia agar: (17 g polypeptone; 3 g pancreatic peptone; 3 g yeast extract; 1 g cornstarch; 5 g NaCl; 13.5 g agar; 1,000 mL distilled water; 100 mL horse blood; pH 7.3). After 7 days, a clear zone around the colonies showed hemolytic activity (Larpent and Larpent Gourgaud 1997).…”

Section: Hemolytic Activitymentioning

confidence: 99%

Molecular identification, antibacterial activity, and production of hydrolytic enzymes by halotolerant bacterium Streptomyces sp. ESM2-25 GTF strain isolated from extreme environment in north-east of Algeria

Alliouch-Kerboua

Bourzama

Gacemi-Kirane

et al. 2023

Nova Biotechnol. Chim.

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The aim of this study is to establish the taxonomic position of the halotolerant bacterium ESM2-25 GTF strain isolated from the extreme environment of El-Mellah lagoon water, which is situated in the city of El-Kala in the northeast of Algeria and to study its phenotypic characteristics, antibacterial activity against several pathogenic bacteria, and hydrolytic enzymes production. The novel bacterium ESM2-25 GTF strain was isolated from water samples by the dilution agar plating method using the starch-casein medium, screened in vitro for its hydrolytic enzymes production and antibacterial activity. The phenotypic and molecular characteristics show that the strain ESM2-25 GTF belongs to the genus Streptomyces. However, the comparison of the morphological and physiological characteristics of the strain ESM2-25 GTF with those of the nearest species showed significant differences. This strain showed an antibacterial activity against Bacillus subtilis subsp. spizizenii CIP 106094, Escherichia coli ATCC 29522, Enterococcus faecalis ATCC 29212, Staphylococcus aureus ATCC 29213 and S. aureus MRSA ATCC 43300, while it is not active against Pseudomonas aeruginosa ATCC 27853. Furthermore, the strain ECM2-25 GTF was able to produce different hydrolytic enzymes such as lipase, protease, amylase, catalase, and gelatinase, which have applications in the field of food and industry. The interesting antibacterial activity of the strain ESM2-25 GTF against pathogenic bacteria and hydrolytic enzymes production indicate the importance of the exploitation of marine actinomycetes for biotechnological applications and the discovery of new antibacterial molecules and could encourage further research on the bioactive molecules secreted by this strain.

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