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2013
KnE Life Sciences
Characterization of Bacillus megaterium and Bacillus mycoides Bacteria as Probiotic Bacteria in Fish and Shrimp FeedThis study was aimedto identify probiotic characteristics and to test the cellulolytic ability of Bacillus megaterium and Bacillus mycoides bacteria for probiotic microbe candidates in fish and shrimp feed. The description of the cellulolytic and amylolytic abilities of these bacteriawas obtained by non-experimental method and descriptive analysis. Probiotic characteristic identification includes growth curve was obtained through total plate count method, cellular and colony morphology, and cellulase and amylase enzyme activity test using DNS method. Results indicated that the maximum growth of B. megateriumwas observed after six hours at 35.62 x 10 10 (CFU), while B. mycoideswasafter 30 hoursat 42.6 x 10 10(CFU). The macroscopic observation showed that the colony of B. megateriumwas concave and smooth,while B. mycoides was flat, relatively rough, with silken threads around the colony.Both bacteria had milky white color, bacillus shape, Gram positive, and sporous. The activity of ce...
Edited and Published by: Project Implementation Unit National Agricultural Technology Program-Phase II Project (NATP-2) Bangladesh Agricultural Research Council (BARC) New Airport Road, Farmgate, Dhaka – 1215 Bangladesh
Sub-Project Completion Report Characterization of Commercial Probiotics being Used for Fish and Shrimp Culture in Bangladesh2019 •
Probiotics are living beneficial microorganisms which confer positive health benefits to the host that has been used in aquaculture in Bangladesh since last decades. However, no comprehensive information on the commercial probiotic products has been found in the literature. Therefore, this study was carried out to isolate and characterize of commercial probiotics being used for fish and shrimp culture in Bangladesh. A total of 31 probiotic products were collected from aqua product sellers and stored of which 27 products were in powder form and 4 in liquid state. All the products were imported from foreign countries like Japan, Thailand, Vietnam and India and in most cases no details label information were found. For isolating the microorganisms, eight different types of selective media such as MRS, LB, NB, PDA, BHI, TSB, Aspergillus differentiated, antibiotic resistance etc. were used. A total of 122 isolates were isolated from twenty-two companies commercial probiotics and stored in 30% glycerol at -220C. For molecular identification of isolates, DNA sequence was performed. The results revealed that diversified genus including 59% Enterobacter, 15% Aeromonas, 13% Enterococcus, 8% Streptococcus and 2% Bacillus, Rhodobacter, Moraxella were identified. The preliminary identification of the selected 122 bacterial isolates were carried out based on morphological and biochemical tests such as gram staining, catalase and oxidase test. Regarding biochemical characterization, 80/122 isolates were found gram positive and 42/122 gram negative, 56/122 oxidase positive and 66/122 oxidase negative, 115/122 catalase positive and 7/122 catalase negative. In case of probiotic properties, different in-vitro assay such as pH tolerance, bile tolerance and auto-aggregation were performed. Most of the tested isolates showed moderate tolerance in acidic condition whereas highly resistant in bile salt. In case of auto-aggregation, most of the isolates showed low auto-aggregation capacity. In addition to that antibiotic resistance and hemolytic assay of different isolates were tested. A total of 56 isolates were screened for antibiotic resistance and showed different level of resistance in response to different antibiotics. To determine the pathogenicity of isolates, a total of 122 isolates were screened out by hemolytic assay and found that 48 isolates showed β hemolysis indicating complete lysis of blood cell. Based on the findings it can be concluded that imported probiotic products are in question in terms of label information, contamination with pathogenic microbes, antibiotic susceptibilities as well as other probiotic properties which ultimately hamper the food safety and quality. More comprehensive study is needed to confirm these properties of commercial probiotic products and emphasis should be given on the evaluation of efficacy of different commercial probiotic products according to their instructions of uses.
World Journal of Microbiology & Biotechnology
Characterization of the three selected probiotic strains for the application in food industry2008 •
Cellulase enzymes have attracted considerable attention in recent years due to their great biotechnological and industrial potential. Cellulase enzymes provide a key opportunity for achieving tremendous benefits of biomass utilization through the bioconversion of the most abundant cellulosic material into the simplest carbohydrate monomer, glucose. Nowadays, the sources of cellulase-producing bacteria have been broadened into the presence of symbiotic bacteria in herbivorous animal and also from marine. Takifugu rubripes or known as Puffer fish is a unique poisonous vertebrate but nevertheless is considered a delicacy in Korea. The diet of the puffer fish includes mostly algae. This dietary habit considers Puffer fish as host of cellulase-producing bacteria, especially on its gut. In the present study an attempt has been made to search for the cellulolytic bacteria in the gut of Takifugu rubripes. Fifty five microorganisms have been isolated using 1% (w/v) Carboxymethyl cellulose (CMC) as substrate. Congo red dye test and DNS method were then used for screening the extracellular cellulase activity of the strains. Among them, TD6 strain has shown the highest performance in term of cellulase activity. In order to evaluate the optimum culture condition of the isolate TD6 for cellulase production, the strain was grown at various temperatures, pH, carbon sources, and nitrogen sources. Under optimum condition, the maximum specific activity of 2.13 U/mg protein was achieved after growth the strain with 1.5% CMC at 45ºC pH 6 for 3 days, respectively. Based on 16S rRNA gene analysis it is proposed that the strain was identified as Bacillus subtilis.
De la lengua por sólo la extrañeza
El <Vocabulario de mexicanismos> de Joaquín García Icazbalceta.pdf2011 •
Me propongo en este artículo matizar los señalamientos de Luis Fernando Lara acerca de su concepción de que los diccionarios de regionalismos son complementos de los diccionario generales, en concreto del DRAE, y la asunción de que el conjunto de regionalismos en los primeros se ofrece como “desvío de las normas impuestas por los académicos“ y, de aquí “su carácter normativo en sentido inverso al del DRAE, al indicar lo que, en principio, “no acepta” esta obra, ya sea porque no se juzga acorde con los valores selectivos de la Academia –léxico normativamente desviado— o se considera como olvido o error de los académicos en cuanto a la postura de Joaquín García Icazbalceta, autor del inconcluso Vocabulario de mexicanismos, ya que considero que esta obra diferencial es de carácter descriptivo y no normativo. Con esta finalidad tomaré en cuenta su valor desde una perspectiva acorde con el contexto histórico-cultural, particularmente el determinado por los modelos científicos europeos que llegaron a México en el siglo XIX y la analizaré en cuanto a la validez de los datos registrados y a su estructura textual. Me apoyo además en la correspondencia que mantuvo con Rufino José Cuervo , particularmente desde 1885 a 1894, año en que murió súbitamente García Icazbalceta, ya que en ella se halla información sustancial para conocer cómo concibió la idea de elaborar un “diccionario de mexicanismos” y los problemas que tuvo durante su elaboración.
2020 •
This paper presents a simulation of the regulation of Araucaria angustifolia (Bertol.) Kuntze timber stocks using Liocourt’s law. Although this species is currently protected by law, recent government initiatives are being considered to propose sustainable forest management practices by selecting small rural properties in Southern Brazil. Here, we simulate the applicability of Liocourt’s law in a typical rural property, the size of which is approximately 85 ha. Forest inventory measurements were conducted by estimating the diameter at the breast height (d), total height (h), and annual diameter increments of 308 trees that fit the criteria of d ≥ 10 cm, distributed on 35 permanent plots of 400 m2 each. As a result, a reverse J-shaped d distribution was found. On average, 303 trees can be found per hectare (ha). Local allometric equations showed their basal area (G) to be 21.9 m2∙ha−1, and their commercial volume (V) to be 172 m3∙ha−1, whereas Liocourt’s quotient (q) was 1.31. Based ...
International journal of Computer Networks & Communications
Prediction Algorithm for Mobile Ad Hoc Network Connection Breaks2020 •
A Mobile Ad-Hoc Network (MANET) is a decentralized network of mobile node that are connected to an arbitrary topology via wireless connections. The breakdown of the connecting links between adjacent nodes will probably lead to the loss of the transferred data packets. In this research, we proposed an algorithm for link prediction (LP) to enhance the link break provision of the ad hoc on-demand remote protocol (AODV). The proposed algorithm is called the AODV Link Break Prediction (AODVLBP). The AODVLBP prevents link breaks by the use of a predictive measure of the changing signal. The AODVLBP was evaluated using the network simulator version 2.35 (NS2) and compared with the AODV Link prediction (AODVLP) and the AODV routing protocols. The simulation results reveal the effectiveness of AODVLBP in improving network performance in terms of average end-to-end delay, packet delivery ratio, packet overhead ratio, and packet drop-neighbour break.
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Call/WA : 0878 5056 7709 | Jual Kesagi Serang
Call/WA : 0878 5056 7709 | Jual Kesagi Serang2023 •
International Journal Of Recycling of Organic Waste in Agriculture
Compost' leachate recycling through land treatment and application of natural Zeolite2012 •