Procjena utjecaja hranidbe probiotikom Streptomyces sp. na rast ukrasne ribe Xiphophorus helleri

The potential of Streptomyces as a probiotic feed for the growth of ornamental fish Xiphophorus helleri has been investigated. The Streptomyces strains used as probiotics were isolated from the marine sponges, namely Callyspongia diffusa, Mycale mytilorum, Tedania anhelans and Dysidea fragilis. Seven probiotic feeds were prepared and their effects were compared with those of control diet containing no probiotics. After 50 days of feeding trials, the growth parameters, namely absolute growth rate, specific growth rate, relative growth rate and feed conversion efficiency were found to be significantly (p<0.05) higher in groups that received probiotic feed additive than in the control, whereas feed conversion ratio was lower. The fish fed with probiotic feed showed significant improvement in length than the fish fed with control feed. Thus it was found that in addition to being effective antibiotic agents against harmful pathogens, Streptomyces could also promote the growth of fish effectively. Marine Actinobacteria, particularly Streptomyces, could thus be a promising probiotic in aquaculture.U radu je ispitana mogućnost dodavanja probiotika Streptomyces sp. hrani i njegov utjecaj na rast ukrasne ribe Xiphophorus helleri. Sojevi Streptomyces, upotrijebljeni kao probiotici, izolirani su iz morskih spužvā, i to iz vrsta Callyspongia diffusa, Mycale mytilorum, Tedania anhelans i Dysidea fragilis. Pripremljeno je sedam probiotičkih pripravaka i procijenjen njihov učinak u usporedbi s kontrolnim uzorkom, tj. hranom bez dodatka probiotika. Nakon 50 dana hranidbenih pokusa parametri rasta, i to apsolutni, specifični i relativni rast te učinkovitost pretvorbe hrane, bili su kudikamo veći (p<0,05) u skupini riba hranjenih probiotikom nego u kontrolnoj skupini, dok je stopa pretvorbe hrane bila manja. Ribe hranjene probiotikom znatno su porasle u usporedbi s kontrolnom skupinom. Utvrđeno je da Streptomyces sp., osim što djeluje antibiotički na štetne patogene, uspješno potiče i rast riba. Aktinobakterije iz mora, a osobito vrsta Streptomyces, mogu se uspješno koristiti kao probiotik pri uzgoju riba

Effect of Actinobacteria as a single cell protein on growth performance of Xiphophorus helleri

The potential of Marine Actinobacteria particularly Streptomyces as a single cell protein (SCP) feed for the growth of ornamental fish, Xiphophorus helleri has been investigated. The Streptomyces strains used as SCP were isolated from the marine sponges, namely Callyspongia diffusa, Mycale mytilorum, Tedania anhelans and Dysidea fragilis. Six SCP feeds were prepared and their effects were compared with those of control diet. After 30 days of feeding trials, the growth parameters including absolute growth rate, specific growth rate and feed conversion efficiency were found to be significantly (P<0.001) higher in groups that received SCP feed than those of control one, whereas feed conversion ratio was lower. Thus it was found that in addition to being effective antibiotic agents against harmful pathogens, Streptomyces could also promote the growth of fish effectively. Marine Actinobacteria, particularly Streptomyces, could play an important role as a single cell protein (SCP) in aquaculture nutrition and is a promising microbe for the development of marine biotechnology

Evaluation of Streptomyces as a Probiotic Feed for the Growth of Ornamental Fish Xiphophorus helleri

The potential of Streptomyces as a probiotic feed for the growth of ornamental fish Xiphophorus helleri has been investigated. The Streptomyces strains used as probiotics were isolated from the marine sponges, namely Callyspongia diffusa, Mycale mytilorum, Tedania anhelans and Dysidea fragilis. Seven probiotic feeds were prepared and their effects were compared with those of control diet containing no probiotics. After 50 days of feeding trials, the growth parameters, namely absolute growth rate, specific growth rate, relative growth rate and feed conversion efficiency were found to be significantly (p<0.05) higher in groups that received probiotic feed additive than in the control, whereas feed conversion ratio was lower. The fish fed with probiotic feed showed significant improvement in length than the fish fed with control feed. Thus it was found that in addition to being effective antibiotic agents against harmful pathogens, Streptomyces could also promote the growth of fish effectively. Marine Actinobacteria, particularly Streptomyces, could thus be a promising probiotic in aquaculture

<img src='http://www.niscair.res.in/jinfo/small.gif' border=0>-glutaminase activity in marine sediments

168-170Mangrove sediments exhibited higher activity of -glutaminase (-glutamine aminohydrolase, EC 3.5, 1.2) compared to sediments collected from other biotopes. Clayey sediments showed higher enzyme activity than the silty ones. The enzyme showed 2 pH optima (at 5.6 and 8.4) but maximum activity was observed at pH 8.4. KM of -glutaminase was 1 x 10-4 M and activity of the enzyme was unaffected by sodium chloride even up to a 10% conc. Citrate ions inhibited the enzyme activity. Glutaminase activity was comparatively higher than asparaginase in all sediment samples collected from different biotopes

Preparation, surface morphology, and optical properties of indium(III) oxide nanoparticles by thermolysis of indium–poly(vinyl alcohol) coordination polymer

<div><p>First report on the preparation of well-dispersed, indium(III) oxide (In₂O₃) nanoparticles with 22–35 nm size by polymer thermolysis is presented. Indium–poly(vinyl alcohol) (PVA) coordination polymer films were prepared by ‘solution casting technique’ from the homogeneous aqueous solution of coordination polymer prepared using PVA and indium(III) nitrate as starting materials; subsequently the films were calcined at 550 °C to yield In₂O₃ nanoparticles. Both indium–PVA coordination polymer that served as the precursor and the titled nanoparticles were characterized by Fourier transform-infrared spectroscopy, photoluminescence (PL), powder X-ray diffraction (XRD), transmission electron microscopy, and thermal analysis. Room temperature PL spectra of the prepared indium oxide nanoparticles showed intense blue emissions around 360, 410 and 430 nm, characteristic of indium oxide nanoparticles due to oxygen vacancies. The lower energy PL emission decreases with an increase of indium(III) content in the precursor. The size of the nanoparticles calculated from line broadening of XRD pattern (cubic; JCPDS: 06-0416) was found to be around 24 nm. The average particle size of the synthesized nanoparticles increased with metal ion content in the precursor coordination polymer.</p></div

Marine biome-derived secondary metabolites, a class of promising antineoplastic agents: A systematic review on their classification, mechanism of action and future perspectives.

Cancer is one of the most deadly diseases on the planet. Over the past decades, numerous antineoplastic compounds have been discovered from natural resources such as medicinal plants and marine species as part of multiple drug discovery initiatives. Notably, several marine flora (e.g. Ascophyllum nodosum, Sargassum thunbergii) have been identified as a rich source for novel cytotoxic compounds of different chemical forms. Despite the availability of enormous chemically enhanced new resources, the anticancer potential of marine flora and fauna has received little attention. Interestingly, numerous marine-derived secondary metabolites (e.g., Cytarabine, Trabectedin) have exhibited anticancer effects in preclinical cancer models. Most of the anticancer drugs obtained from marine sources stimulated apoptotic signal transduction pathways in cancer cells, such as the intrinsic and extrinsic pathways. This review highlights the sources of different cytotoxic secondary metabolites obtained from marine bacteria, algae, fungi, invertebrates, and vertebrates. Furthermore, this review provides a comprehensive overview of the utilisation of numerous marine-derived cytotoxic compounds as anticancer drugs, as well as their modes of action (e.g., molecular target). Finally, it also discusses the future prospects of marine-derived drug developments and their constraints

Assessment of hashtag Covid in social media

Introduction: The time of Covid pandemic had mandated most of the people to be distanced individually and connected through social medias. The social medias serve as a medium to communicate about covid related issues without any barriers and assures maximum reachability Objectives: The objectives of this study were to evaluate the pattern of posts which is shared via covid-related posts and to assess the characteristics of the posts under hashtags about this worldwide pandemic among three social media platforms, namely, Twitter, Instagram, and Facebook. Methodology: This was a cross-sectional study which analysed# covid posts in Instagram, Facebook, and Twitter. Public posts related to that were searched and assessed separately. Source, popularity, credibility, type, background and other characteristics were assessed about each postwas assessed. Results: Out of 3600 posts, 3120(86.7%) were related to the study. Instagram displayed more of individual posts (40.2%) and more popular (50.4%) with positive perception (42.1%) and more credible (45.4%)compared to other social media. Also, Instagram posts were more frequent (54%) and related with the subject (42%) in comparison to other social medias.Among the credible posts 79.4% were sourced by individual, 87.5% with positive perception, 80.7% awareness related and 81.3% were images. Conclusion: The study showed that the subject covid pandemic were supported and promoted by social media mainly through images and most of the posts were popular with credibility. Also, the posts were mostly related to awareness and positively perceived by the viewers. Instagram showed more popular, individual sourced, credible, positively perceived, awareness related posts among the related posts in the study