similar activity
Recently Published Documents


TOTAL DOCUMENTS

187
(FIVE YEARS 55)

H-INDEX

29
(FIVE YEARS 5)

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 386
Author(s):  
Héctor de Paz Carmona ◽  
Jakub Frątczak ◽  
Zdeněk Tišler ◽  
José Miguel Hidalgo Herrador

Phonolite material has shown to be promising catalyst support for the deoxygenation of triglycerides. In this work, we continue with our previous research by synthesising and testing three acid-treated phonolite-supported Co-Mo, Ni-Mo and Ni-W catalysts for the hydrotreating of atmospheric gas oil and co-processing with rapeseed oil at industrial operating conditions (350–370 °C, WHSV 1–2 h−1, 5.5 MPa) in the continuous regime for more than 270 h. The phonolite-supported catalysts showed hydrotreating activity comparable with commercial catalysts, together with a complete conversion of triglycerides into n-alkanes. During co-processing, the Ni-promoted catalyst showed strong stability, with similar activity previous to the rapeseed oil addition. Our results enable us to evaluate the suitability of phonolite as catalyst support for the development of plausible alternatives to conventional hydrotreating catalysts for the co-processing of middle distillates with vegetable oils.


Author(s):  
Audrey Gueniche ◽  
Muriel Liboutet ◽  
Stephanie Cheilian ◽  
Dominique Fagot ◽  
Franck Juchaux ◽  
...  

The term probiotic has been defined by experts as live microorganisms, which when administered in adequate amounts, confer a health benefit on the host. Probiotics are, thus, by definition, live microorganisms, and the viability of probiotics is a prerequisite for certain benefits, such as the release of metabolites at the site or adhesion properties, for example. However, some semi-active or non-replicative bacterial preparations may retain a similar activity to the live forms. On cosmetic, lysates or fractions are generally used. Topically applied Vitreoscilla filiformis extract has shown to have some similar biological activity of probiotics in the gut, for example, regulating immunity by optimisation of regulatory cell function, protecting against infection, and helping skin barrier function for better recovery and resistance. Due to their mode of action and efficacy, V. filiformis extract (lysate including membrane and cytosol) may be considered as non-replicative probiotic fractions, and this review article presents all its properties.


2021 ◽  
pp. 66-69
Author(s):  
Teresa Pegors

Much research has been done to show where in the brain there is similar activity for different kinds of beauty judgments. In the article under discussion, the authors set out to determine where in the brain unique information about different kinds of beauty is found. In their experiment, participants made beauty judgments of faces and landscapes while their brain activity was measured with functional magnetic resonance imaging (fMRI). By using an analysis technique that focused on patterns of activity rather than overall activation, the authors showed that the ventromedial prefrontal cortex (vmPFC) contained unique information about each type of beauty. Understanding more about the neuroscience of how modern people evaluate beauty may help uncover larger truths about the history of human culture and art.


Author(s):  
Dennis Castillo-Figueroa ◽  
Daniela Martínez-Medina ◽  
Miguel E. Rodríguez-Posada

Neotropical savannas have undergone continuous processes of landscape transformation (e.g., agriculture, oil, gas, and hydrocarbon industry) and very little is known about the ecology and natural history of key biological groups such as terrestrial mammals while the information on behavioral aspects of mammalian species in these ecosystems is very scarce. Here, we aimed to describe the activity patterns of medium and large mammals in two savanna ecosystems in the Colombian Llanos. A set of 60 camera traps was installed in the two ecosystems for 35 days (2100 camera days). We described the activity patterns of nine predominantly nocturnal species. We found no difference in circadian distributions of mammals between ecosystems. Cuniculus paca Linnaeus 1758 and Dasyprocta fuliginosa Wagler 1832 showed patterns of exclusion probably due to competition whereas other species like Tamandua tetradactyla Linnaeus1758 and Myrmecophaga tridactyla Linnaeus 1758 displayed similar activity patterns. We highlight the importance of savannas for the conservation of these species and discuss the relevance of studies on activity patterns for mammal ecology and conservation in Neotropical savannas. 


2021 ◽  
Vol 40 (3) ◽  
pp. 1-17
Author(s):  
Risikat Nike Ahmed ◽  
Mercy Oluwaseyi Bamigboye ◽  
Kamoldeen Abiodun Ajijolakewu ◽  
Sheriffdeen Olakunle Idris ◽  
Nimat Toyosi Ajide Bamigboye

Antibiotics are one of the most exploited metabolites produced by soil actinomycetes. This study isolated fifteen actinomycetes (A1 – A15) from dumpsite soils within Ilorin metropolis & screened them for antibacterial activity. Isolates were identified with morphology & biochemical characteristics.Their activity against clinical bacteria (Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae & Staphylococcus aureus) was determined. Their bioactive metabolites after fermentation was assayed for by agar well diffusion & compared with reference antibiotics. Molecular analysis of two most active isolates was done. The most active metabolite was subjected to GCMS. All isolates were identified as Streptomyces, 7 isolates exhibited activity against 3 test bacteria with highest (10.5mm±0.35) by Streptomyces griseoplanus while S. aureus demonstrated total resistance to all isolates. Secondary activity revealed 7 of the metabolites as effective against the bacteria with highest activity (28.5±1.04mm) by S. sparsogenes showing similar activity with Cefuroxime (28.01±0.01mm). The two most active isolates were Streptomyces griseoplanus strain NR725RL-ISP 5009 & Streptomyces sparsogenes strain NBRC 1308616S & RNA nucleotide similarity revealed close phylogenic relationship. GC-MS revealed10 compounds in S. sparsogenes strain NBRC 1308616S metabolite. Streptomyces from dumpsite soils within Ilorin produced bioactive compounds against clinical test bacteria and thus could be potential sources of antibiotics.


2021 ◽  
Author(s):  
Karine Delord ◽  
Henri Weimerskirch ◽  
Christophe Barbraud

The transition to independent foraging represents an important developmental stage in the life cycle of most vertebrate animals. Juveniles differ from adults in various life history traits and tend to survive less well than adults in most long-lived animals. Several hypotheses have been proposed to explain higher mortality including that of inadequate/inferior foraging skills compared to adults, young naive individuals combining lack of experience and physical immaturity. Thus a change in behaviour, resulting in an improvement of skills acquired from growing experience, is expected to occur during a period of learning through the immaturity phase. Very few studies have investigated the ontogeny of foraging behaviour over long periods of time, particularly in long-lived pelagic seabirds, due to the difficulty of obtaining individual tracking data over several years. We investigated the foraging behaviour, through activity patterns, during the successive life stages of the endangered Amsterdam albatross by using miniaturized activity loggers on naive juveniles, immatures and adults. Juvenile naive birds during their first month at sea after leaving their colony exhibited lower foraging effort (greater proportion of time spent sitting on water, higher duration and more numerous bouts on water, and lower duration and less numerous flying bouts). Juveniles reached similar activity values to those of immatures and adults as early as the 2nd-3rd months since independence, suggesting a progressive improvement of foraging performances during the first two months since fledging. We found support for the body-size hypothesis with respect to sex differences in activity parameters according to time elapsed since departure from the colony and month of the year, consistent with the important sexual dimorphism in the Amsterdam albatross. Whatever the life stage considered, activity parameters exhibited temporal variability reflecting the modulation of foraging behaviour possibly linked to both extrinsic (i.e. environmental conditions such as variability in food resources or in wind) and intrinsic (i.e. energetic demands linked to plumage renew during moult) factors.


2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Ola Tarawneh ◽  
Imad Hamadneh ◽  
Rawan Huwaitat ◽  
Ameen Rasheed Al-Assi ◽  
Abdulla El Madani

Periodontitis comprises a chronic inflammation that is initiated by microbiota biofilm. If left untreated, periodontitis may lead to permanent tooth loss. Herein, we propose to design and improve a localized form of therapy comprising a chlorhexidine-impregnated hydrogel. Hydrogel films were prepared by varying the ratio between cellulose (MCC) and carboxymethylcellulose sodium (CMC) using the crosslinker epichlorohydrin (ECH). The hydrogel was loaded with chlorhexidine. Increasing the CMC ratio led to a reduction in the number of pores, an increase in their size, lower glass transition temperature ( T g ), decreased Young’s modulus, and increased film stretching and affected the time of release. Bacterial and fungal zones of inhibition showed similar activity and were not affected by the CMC and MCC ratio. Hydrogels loaded with chlorhexidine prevented the growth of S. oralis and C. albicans microorganisms and may provide a promising local delivery system for treating periodontitis.


2021 ◽  
Vol 4 (1) ◽  
pp. 24-30
Author(s):  
Harapin Hafid

Transmigrant society generally have owned ox livestock and used as buffalo is livestock work to assist everyday them agricultural activity. But the way of conducted conservancy and conducting still have the character of traditional so that result of obtained not yet gratified, either from facet accretion of body wight and price sell yielded livestock. Conservancy facet and giving of feed, farmer still rely on to look for livestock forege at un-tilled areal which growed by many natural grasses, sometimes only given the rest of agricultural produce. Method approach of activity taken with: (1) discussion and discourse concerning activity livestock intensification technology, (2) tuition and demonstration election of seed, way of conducting, conservancy, preventive of disease and processing of result, (3) discussion and discourse concerning exploiting of agricultural produce remains as livestock pakan and processing of livestock dirt become compost. presented Counselling items get well enough and positive respon from all participants remember during the time have never been conducted similar activity. In general the participants wanted to adopt training materials and were very active in the demonstration of work livestock intensification techniques (80%) and 20% did not take a stand because farmers did not have cattle.. Please conclude that all targets which consist of all societies in of Cialam Jaya in activity of training applying of activity livestock intensification. All participants of wishful training to be their countryside is made by countryside of sercive Faculty of Agriculture University of Haluoleo in activity of devotion to society.


Author(s):  
Koichi Furukawa ◽  
Lidya Handayani Tjan ◽  
Silvia Sutandhio ◽  
Yukiya Kurahashi ◽  
Sachiyo Iwata ◽  
...  

Abstract Background In March 2021, Japan is facing a 4th wave of SARS-CoV-2 infection. To prevent further spread of infection, sera cross-neutralizing activity of patients previously infected with conventional SARS-CoV-2 against novel variants is important but is not firmly established. Methods We investigated the neutralizing potency of 81 COVID-19 patients' sera from the 1st–4th waves of pandemic against SARS-CoV-2 D614G, B.1.1.7, P.1, and B.1.351 variants using their authentic viruses. Results Most sera had neutralizing activity against all variants, showing similar activity against B.1.1.7 and D614G, but lower activity especially against B.1.351. In the 4th wave, sera-neutralizing activity against B.1.1.7 was significantly higher than that against any other variants, including D614G. The sera-neutralizing activity in less-severe patients was lower than that of more-severe patients for all variants. Conclusions The cross-neutralizing activity of convalescent sera was effective against all variants but was potentially weaker for B.1.351. The high neutralizing activity specific for B.1.1.7 in the 4th wave suggests that the mutations in the virus might cause conformational change of its spike protein, which affects immune recognition for D614G. Our results indicate that individuals who recover from COVID-19 could be protected from the severity caused by infection with newly emerging variants.


Sign in / Sign up

Export Citation Format

Share Document