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31.
Antibacterial activity of Alangium salviifolium flowers 总被引：1，自引：0，他引：1
The methanol extract of Alangium salviifolium flowers showed a wide spectrum of antibacterial activity against both gram-positive and gram-negative bacteria. 相似文献
32.
Roy Krishna Kanta Reza Md Mostofa Ali Muzahid-E-Rahman Md Anwar Md Babul Kishowar-E-Mustarin Kabir Muhammad Rezaul Malaker Paritosh Kumar Barma Naresh Chandra Deb Hossain Md Israil He Xinyao Chawade Aakash Singh Pawan Kumar 《Euphytica》2021,217(7):1-23
Euphytica - Genetic approaches often lead to the most cost-effective and efficient means to improve crops, especially those grown widely. But for most crops, cotton included, genetic improvement... 相似文献
33.
A 12‐week feeding trial was carried out in concrete tanks to examine complete and partial replacement (75%) of fish meal (FM) with poultry by‐product meal (PBM), meat and bone meal (MBM) and soybean meal (SBM) in practical feeds for African catfish Clarias gariepinus. Triplicate groups of fish (initial body weight ranged from 90.33 to 93.93 g fish−1) were fed seven isonitrogenous and isocaloric diets of 20% digestible protein and 300 kcal 100 g−1 of digestible energy. The control contained 25% herring meal, whereas in the other six diets, PBM, MBM and SBM replaced 75% or 100% of the FM. Final body weight (FBW) and specific growth rate (SGR) of the fish fed diets containing PBM (75% and 100%), SBM (75% and 100%) and MBM (75%) were all higher, but not significantly different than those for fish fed the control diet. Replacing 100% of the FM by MBM significantly lowered FBW and SGR. Concerning whole body composition, there were no significant differences in ash and gross energy content of whole‐body among fish; fish fed diets containing PBM‐100% recorded significantly lower protein content compared with the control diet, while fish fed diet SBM‐100% recorded significantly lower moisture content compared with the control diet. Also fish fed diets SBM‐100% and PBM‐75% recorded higher lipid and gross energy contents compared with the control diet. The study revealed that satisfactory growth and feed utilization responses could be achieved through the replacement of FM by PBM, SBM and MBM in the diet of African catfish. 相似文献
34.
Probiotic microbial feed supplements are gaining wide acceptance in livestock production, and may be applicable to aquaculture production systems. The present study was conducted to examine probiotic treatment in the fingerling diet of Nile tilapia Oreochromis niloticus (L.). A total of 240 of Nile tilapia fingerlings (weight ranged from 22.96 to 26.40 g) were divided into five experimental groups. The experiment was conducted for 120 days. Experimental diets were identical in all, except for the variation in probiotic levels. A probiotic (Biogen®) was used at 0% (diet 1), 0.5% (diet 2), 1.5% (diet 3), 2.0% (diet 4) and 2.5% (diet 5) inclusion rates in the experimental diets. The growth performance and nutrient utilization of Nile tilapia including weight gain, specific growth rate, protein efficiency ratio, protein productive value and energy retention were significantly (P≤0.01) higher in the treatment receiving probiotic (Biogen®) than the control diet. No differences were observed for moisture, ash and protein content (P≤0.01) among the experimental diets. The lowest gross energy and lipid contents were recorded for fish fed the diet containing 0.5% Biogen® (P≤0.01). The production performance and subsequent cost–benefit analyses clearly indicated that the diets containing probiotic biogen recorded the highest net return and the lowest total cost compared with the control diet. 相似文献
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36.
Bioavailability of arginine from Indian mustard protein concentrate and meal compared with that of a soy protein concentrate in rainbow trout (Oncorhynchys mykiss) 
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下载免费PDF全文 M. A. Kabir Chowdhury Kattia Preciado Iñiguez Cornelis F. M. de Lange Vernon Osborne Andreas Lemme Dominique P. Bureau 《Aquaculture Research》2015,46(9):2092-2103
Relative bioavailability (RBV) of arginine (Arg) from Indian mustard protein concentrate (IMC, 62% crude protein) and Indian mustard meal (IMM, 42% crude protein), and a commercially available soy protein concentrate (SPC, 57% crude protein) was compared with that of crystalline L‐arginine (L‐Arg) in rainbow trout. A basal diet highly deficient in Arg (1.23%) was formulated. Eight other isoproteic and isoenergetic diets were formulated to contain ~1.35% and ~1.5% Arg by adding increasing amount of IMC, IMM, SPC and L‐Arg. The experimental diets were fed for 16 weeks using a standard protocol. Growth rate, weight gain (g fish?1) and protein (PD, g fish?1) and lipid (LD, g fish?1) deposition were increased linearly with increasing level of Arg from all ingredients. Arg availability from protein‐bound sources were equal or higher than those from L‐Arg. RBV of Arg from IMC, IMM and SPC were ranged from 100% and 123% than that from L‐Arg (assumed as 100% bio‐available). Among the ingredients, only the RBV of Arg from IMC was significantly higher than those from SPC (P < 0.05). The findings suggest that the RBV of Arg from IMC and IMM are very good and comparable to that of the commercial SPC used in this study. 相似文献
37.
Dothistromin is a broad‐spectrum mycotoxin produced by the Dothideomycete pine needle pathogen Dothistroma septosporum. It accumulates in lesions, causing characteristic red bands on needles infected with this fungus. Dothistromin is similar in structure to the aflatoxin precursor versicolorin B and the biosynthetic pathways of these toxins share many common gene products. Although dothistromin is not essential for pathogenicity in dothistroma needle blight, its presence in infected needles suggests it might have a role in the disease process. The hypothesis that dothistromin is a virulence factor was tested by studying Pinus radiata infected with dothistromin‐deficient mutants of D. septosporum. The mutants were able to infect pine needles and complete their life cycle as previously shown, and were unaffected in spore germination, epiphytic growth or needle penetration. However, colonization of the mesophyll by the mutants was restricted compared to the wild type. Correspondingly, lesions produced by the mutants were smaller and produced significantly fewer spores than lesions produced by wildtype strains. Interestingly, ‘green islands’, in which chlorophyll was maintained at a higher level than in adjacent chlorotic and necrotic regions, surrounded early‐appearing lesions caused by both wildtype and mutant strains. At a later stage of disease development green islands were still present in the mutant but appeared to be masked by the extended dothistromin‐containing lesions in the wild type. Overall the results support a role for dothistromin in virulence in dothistroma needle blight. 相似文献
38.
Xiao‐Qin Li Xiao‐Qing Zhang Mohiuddin Amirul Kabir Chowdhury Yi Zhang Xiang‐Jun Leng 《Aquaculture Nutrition》2019,25(1):46-55
A 10‐week study was conducted to evaluate the effects of supplemental phytase and protease in low phosphorus (LP) and fishmeal‐free diets (FMF) on growth and nutrient utilization of tilapia. Seven isonitrogenous diets were prepared as positive control diet (PC) containing 60 g/kg fishmeal and 18 g/kg monocalcium phosphate (MCP), LP diet (12 g/kg MCP), FMF diet, LP‐FMF diet, and three enzyme diets with phytase (LP + Ph), protease (FMF + Pr), and phytase + protease (LP‐FMF + Ph + Pr) supplementation in LP, FMF and LP‐FMF diets, respectively. Weight gain, nutrient (except Ca) retention and digestibility of LP, FMF and LP‐FMF groups were lower than those of PC group (p < 0.05). Compared to LP, FMF and LP‐FMF groups, the supplementation of phytase, protease and phytase + protease improved WG by 13.2%, 11.1% and 13.0% (p < 0.05). The three enzyme groups showed higher digestibility of protein and P, and higher intestinal villus length than those of LP, FMF and LP‐FMF groups (p < 0.05), respectively. Dietary phytase and Ph + Pr also promoted the retentions of crude protein and P (p < 0.05). The results indicated that the supplementation of phytase in LP diet and protease in FMF diet improved the growth and nutrient utilization, and phytase reduced MCP inclusion in the diet of tilapia. 相似文献
39.
Assessing the bioavailability of L‐methionine and a methionine hydroxy analogue (MHA‐Ca) compared to DL‐methionine in rainbow trout (Oncorhynchus mykiss) 下载免费PDF全文
下载免费PDF全文 Christopher D Powell M A Kabir Chowdhury Dominique P Bureau 《Aquaculture Research》2017,48(1):332-346
Different synthetic forms of supplemental methionine (Met) are produced commercially by various manufacturers. Limited information exists on the bioavailability of these different forms in commercially relevant fish species. The objective of this study was to compare the relative bioavailability of L‐methionine and a methionine hydroxy analogue calcium salt (MHA‐Ca) to DL‐methionine in a commercially relevant species, rainbow trout, using a linear slope‐ratio assay. In addition, the ability of the rainbow trout to effectively convert the D‐isomer of methionine into the biologically active L‐isomer was studied by comparing the relative bioavailability of L‐methionine to DL‐methionine. Nine (9) diets were created from a methionine‐deficient basal diet which was supplemented with graded equimolar levels of methionine (0.1%, 0.2%, 0.3% of diet by weight) from either DL‐methionine, L‐methionine and methionine hydroxy analogue calcium salt (MHA‐Ca). Diets were fed in triplicate (IBW = 24.0 ± 0.6 g) for 12 weeks using a pair‐feeding protocol. The basal diet was formulated to be deficient in both methionine (0.5%) and cysteine (0.3%), whereas meeting all other known nutritional requirements of rainbow trout. MHA‐Ca was found to be less available (P < 0.05) than DL‐methionine with relative bioavailability values of 69%, 60% and 73% based upon weight gain, growth rate (TGC) and retained nitrogen values respectively. No significant differences (P > 0.05) in bioavailability were found between DL‐methionine and L‐methionine. These findings lead to the conclusion that differences in bioavailability do exist between sources of synthetic methionine, additionally findings suggest that rainbow trout are able to effectively convert the D‐isomer of methionine into the L‐isomer without significantly affecting fish performance. 相似文献
40.
Md Mozammel Haque Jatish C. Biswas M. R. Islam A. Islam M. S. Kabir 《Journal of plant nutrition》2013,36(20):2901-2914
Nutrient sources and management influence soil properties and crop productivity indicating that sustained crop production needs nutrient rate specific tuning after certain periods of time. We hypothesize that long-term use of organic and inorganic nutrient sources maintains soil fertility and improve crop production. Yield and nutrient use efficiencies have not been evaluated in Bangladesh from long-term fertilizer trials focusing on adaptation strategies for sustained food production. So, the objectives of the present investigation were to examine the effects of organic and inorganic amendments on yields and soil properties under a rice-fallow-rice system. The experiment was initiated in 1985 with 12 treatments under dry season irrigated rice culture at the Bangladesh Rice Research Institute, Gazipur. The effects of organic and inorganic nutrient sources were evaluated under missing element techniques. The contributions of nitrogen (N), phosphorus (P), and potassium (K) fertilizers to yields were more in the dry season but the role of P was negligible in the wet season. The omissions of N, P and K nutrients are not suitable management option for rice cultivation during dry and wet seasons, although P can be omitted in the wet season provided its full dose is applied in the dry season. The combined use of organic and inorganic nutrient sources are the best option for improving rice productivity and sustaining soil fertility in a rice-fallow-rice system in Bangladesh. 相似文献