condition

摘要： A crucial step for understanding human evolution is to identify the genomic changes that occurred during primate evolution,thus allowing investigators to reconstruct the ancestral states preceding the human condition.In the past several decades,the primate clade has been a research focus in genome sequencing due to its unique phylogenetic position and key importance.

摘要： Objective: The objective of the present study is to optimize cellulase production in five strains: (Pantoea dispersa MLTBY6 (MT646430.1);Pseudomonas aeruginosa MLTBM2 (MT646431.1);Pseudomonas monteilii MLTBC10 (MT674682.1);Bacillus subtilis MLTBC5 (MT674681.1) and Lysinibacillus fusiformis MLTBB7 selected cellulase producers isolated from soils in Brazzaville, Republic of the Congo. Materials and Methods: The cellulolytic activity of the selected cellulase-producing strains was determined by transferring the strains to a petri dish containing CMC culture medium with the following composition: cellulose 1%, K2HPO4 0.2%, MgSO4 0.03%, peptone 1%, (NH4)2SO4 0.2% adjusted to a pH value of 7, previously poured and then frozen. The dishes were incubated in an oven at 37°C for 48 hours. The petri dishes were then flooded with 1% lugol for 15 minutes. A positive reading is indicated by the formation of a hydrolysis zone, the diameters of the hydrolysis zone were measured with a ruler. Strains with a broad lysis spectrum were selected. Optimisation of cellulase production by five bacterial strains isolated from the soil was done using the following factors: temperature and pH. Results: The production of cellulase showed that these strains showed a high production of cellulase at pH values between 5.6 and 9 with an optimum of pH = 8 and temperature values between 35°C and 40°C with an optimum at temperature t = 40°C. Of the carbon sources used, two sources, namely glucose and galactose, showed a high production of cellulase compared to the other carbon sources. However, the two nitrogen sources, ammonium sulphate and urea, were favourable for cellulase production by all five strains. Fe2+, CO2+, Zn2+ ions are favourable for cellulase production by these strains, with a referendum for Fe2+. Conclusion: From these results, we conclude that the sources of carbon (glucose and galactose), nitrogen (ammonium sulphate and urea) and ions (Fe2+, CO2+, Zn2+) added to these five strains were the elements favouring the good production of cellulase.

摘要： Considering the adverse effects of nonimpacted third molars(N-M3s)on the periodontal health of adjacent second molars(M2s),the removal of N-M3s may be beneficial to the periodontal health of their neighbors.This study aimed to investigate the clinical,immunological,and microbiological changes of the periodontal condition around M2s following removal of neighboring N-M3s across a 6-month period.Subjects with at least one quadrant containing an intact first molar(M1),M2,and N-M3 were screened and those who met the inclusion criteria and decided to receive N-M3 extraction were recruited in the following investigation.M2 periodontal condition was interrogated before M3 extraction(baseline)and at 3 and 6 months postoperatively.Improvements in clinical periodontal indexes of M2s in response to their adjacent N-M3 removal,along with changes in inflammatory biomarkers among gingival crevicular fluid(GCF)and the composition of subgingival plaque collected from the distal sites of the M2s of the targeted quadrant were parallelly analyzed.Complete data of 26 tooth extraction patients across the follow-up period were successfully obtained and subsequently applied for statistical analysis.Compared to the baseline,the periodontal condition of M2s was significantly changed 6 months after N-M3 removal;specifically,the probing depth of M2s significantly reduced(P<0.001),the matrix metalloproteinase(MMP)-8 concentration involved in GCF significantly decreased(P=0.025),and the abundance of the pathogenic genera unidentified Prevotellaceae and Streptococcus significantly decreased(P<0.001 and P=0.009,respectively).We concluded that N-M3 removal was associated with superior clinical indexes,decreased GCF inflammatory biomarkers,and reduced pathogenic microbiome distribution within the subgingival plaque.Although the retention or removal of N-M3s continues to be controversial,our findings provide additional evidence that medical decisions should be made as early as possible or at least before the neighboring teeth are irretrievably damaged.

摘要： Following publication of the original article[1],in the description of the leaf shrinking procedure as well as in Algorithm 1 and the definition of edge-based graphs in[1],the condition that G contains at least two leaves(i.e.,the condition|VL(G)|≥2)needs to be omitted.

摘要： Body condition of suckler cows at the time of calving has an important effect on calving ease and mortality of calves.In the last eight weeks before calving the body condition should be reduced or at least not increased.Rations with a higher amount of crude fibre can be used(rations with straw or late mowed grass silage(GS))to control the body condition score.Eight suckler cows(Charolais)were feeding a total mixed ration(TMR)in the last eight weeks before calving and GS after calving.By the addition of straw(30%in TMR1 vs 60%in TMR2 of dry matter)was varied the amount of crude fibre in the TMR(GS,straw,mineral)before calving.In the period after calving were GS feeding.Last measurement took place on the pasture(PS).Rumen fluid,plasma,body weight and back fat thickness were collected.Rumen fluid pH was assessed immediately after collection using an electronic pH meter.Volatile fatty acids(VFA),sedimentation,methylene-blue and amount of infusorians were measured.From four key figures an“index of rumen fermentation”(IRF)in the rumen was formed.Statistical analysis took place with analysis of variance(ANOVA)with fixed effects of treatment(TMR1,TMR2,GS and PS)and number of lactations(3-7 lactations)using SPSS Version 25.0 for Windows.Rumen fluid pH had significant differences between variants(TMR1 by 6.6,TMR2 by 6.9,GS by 6.6 and PS by 6.9),but was not affected by other effects.The IRF showed a disturbed fermentation in the rumen by feeding the TMR 1+2 with high amount of crude fibre(score:>10.0 points)and a very good situation for fermentation during grazing the PS(score:6.9 points).The long-term use of crude fibre-rich rations in the period before calving may cause deviations from undisturbed fermentation in the rumen and adversely affect the utilization of the feed in the rumen.

摘要： Polymer Electrolyte Fuel Cell(PEFC)is required to be operated at temperature at 100°C for fuel cell vehicle applications during the period from 2020 to 2025 in Japan.It is expected that micro porous layer(MPL)and thinner polymer electrolyte membrane(PEM)would enhance the power generation performance of PEFC at this temperature.The key objective of this study is to analyse the impact of MPL and thickness of PEM on the temperature distributions of interface between the PEM and catalyst layer at the cathode(i.e.,the reaction surface)in a single PEFC.A 1D multi-plate heat transfer model,considering vapor transfer,which is based on temperature data of separator measured using thermograph in power generation process.It is developed to evaluate temperature at the reaction surface.This study is investigated the effect of flow rate and relative humidity of supply gases on temperature distribution on reaction surface.The study reveals that the impact of flow rate of supply gas on temperature distribution on reaction surface is smaller with and without MPL.It is observed that the even temperature distribution on reaction surface as well as higher power generation performance can be obtained with MPL irrespective of thickness of PEM and relative humidity conditions.

摘要： Ti3+ self-doping modified V2O5/TiO2 catalyst was prepared by sol-gel and impregnation methods and used for selective catalytic reduction (SCR) of NOx with NH3. Results showed that Ti3+ self-doped V2O5/TiO2 catalyst performed the better catalytic activity. And X-ray diffraction and scanning electron microscopy were used to evaluate the phase composition and morphology of the prepared catalyst. The effects of calcinations temperature of the support, oxygen concentration, [NH3]/[NO] molar ratio and the GHSV on the denitration performance were investigated. It was found that more than 80% NOx conversion was obtained at 210°C when the O2 volume fraction was 5%, the NO concentration was 500 ppm, the [NH3]/[NO] molar ratio = 1 and the GHSV was 23,885 h?1. The results showed that the catalytic activity increased first with the increasing of O2 concentration and [NH3]/[NO] molar ratio, then remained stable. At the same time, the stability of the catalyst was also studied at the temperature of 210°C. The reaction continued for 750 minutes, and the catalytic activity remained above 80%, indicating that the catalyst has a good stability. Moreover, the Ti3+ self-doped V2O5/TiO2 catalyst also showed good SO2 and H2O resistance. Therefore, these findings provide important information to better understand the application of the prepared catalyst.

摘要： In recent years, a vast amount of work has been done on initial value problems for important nonlinear evolution equations like the nonlinear Schrödinger equation (NLS) and the Korteweg-de Vries equation (KdV). No comparable attention has been given to mixed initial-boundary value problems for these equations, i.e. forced nonlinear systems. But in many cases of physical interest, the mathematical model leads precisely to the forced problems. For example, the launching of solitary waves in a shallow water channel, the excitation of ion-acoustic solitons in a double plasma machine, etc. In this article, we present the PDE (Partial Differential Equation) method to study the following iut = uxx - g|u|pu, g ∈ R, p > 3, x?∈ Ω = [0,L], 0 ≤?t?u (x,0) = u0 (x) ∈?H2 (Ω) and Robin inhomogeneous boundary condition ux (0,t) + αu (0,t) = R1(t), t ≥ 0 and ux (L,t) + αu (L,t) = R2 (t), t ≥ 0 (here?α?is a real number). The equation is posed in a semi-infinite strip on a finite domain Ω. Such problems are called forced problems and have many applications in other fields like physics and chemistry. The main tool of PDE method is semi-group theory. We are able to prove local existence and uniqueness theorem for the nonlinear Schrödinger equation under initial condition and Robin inhomogeneous boundary condition.

摘要： In this article,under suitable conditions on the internal term f(·)and the bound-ary nonlinear term g(·),we prove blow-up results for a class of nonclassical diffusion equations with nonlinear boundary condition.

摘要： A manipulator-type docking hardware-in-the-loop(HIL)simulation system is proposed in this paper,with further development of the space docking technology and corresponding requirements of the engineering project.First,the structure of the manipulator-type HIL simulation system is explained.The mass and the flexibility of the manipulator has an important influence on the stability of the HIL system,which is the premise of accurately simulating actual space docking.Thus,the docking HIL simulation models of rigid,flexible and flexible-light space manipulators are established.The characteristics of the three HIL systems are studied from three important aspects:the system parameter configuration relation,the system stability condition and the dynamics frequency simulation ability.The key conclusions obtained were that the system satisfies stability or reproduction accuracy.Meanwhile,the influence of different manipulators on the system stability is further analyzed.The accuracy of the calculated results is verified experimentally.