The ontogeny of acidic digestive tract in larval turbot Scophthalmus maximus based on H+/K+-ATPase and pepsinogen

Acidic digestion is an important digestive process of marine fish.In fish stomach,two enzymes are involved in the secretion of hydrochloric acid(HCl)and proteomic digestion:H^(+)/K^(+)-ATPase and pepsinogen.However,the starting of digestive function in fish is still unclear.To reveal the details of acidic digestion of turbot Scophthalmus maximus in early development,a 40 day of turbot larvae culture was conducted.The H^(+)/K^(+)-ATPase gene from the turbot S.maximus(smH^(+)/K^(+)-ATPase)was identified and characterized.Based on our previous discription on pepsinogen of turbot S.maximus,we combined pepsinogen and H^(+)/K^(+)-ATPase and analyzed the mechanism of acidic digestion in turbot.Results show that the spatial and temporal expression profiles of H^(+)/K^(+)-ATPase agreed with pepsinogen A and C in turbot,indicating a synergetic action between H^(+)/K^(+)-ATPase and pepsinogen during the acidic digestion process.In addition,the turbot juveniles showed a faster growth after the expressions of H^(+)/K^(+)-ATPase gene and pepsinogen gene,demonstrating that pepsin had a higher digestive efficiency,for which a compound diet should be provided to the fish from Day 22 onward.This study provided a reference for biology research and aquaculture of turbot and other marine fishes.

Effects of dissolved oxygen on intestinal bacterial community and immunity of Atlantic salmon Salmo salar

Dissolved oxygen(DO)is one of most important factors which affect wide range physiologic features of including immune responses and intestinal bacterial community.However,the underlying mechanisms remain enigmatic.To address this question,the intestinal bacterial community compositions and the immune features of Atlantic salmon(Salmo salar)grown in recirculating aquaculture systems(RAS)were characterized.Fish were reared under different DO saturation levels,e.g.,200% saturation named high group(H),100%saturation named control group(CK),and 60%saturation named lower group(L).Large variations in the operational taxonomic units(OTUs)frequency distribution for the intestinal bacterial community of Atlantic salmon were observed.The intestinal bacterial community of all groups was dominated mainly by three phyla,e.g.,Proteobacteria.Firmicutes,and Bacteroidetes.Interestingly,Acinetobacter baumannii,an opportunistic pathogen of salmon was increased significantly in L group.We further monitored the immunity features of fish under different DO levels.The results show that leucocyte number,cortisol level,the expressions of interleukin-1β(IL-1β),Toll-like receptor 4(TLR4),and nucleotide-binding oligomerization domain like protein 2(NOD2)were higher at significant levels in the L group than those in the other two groups.TLR4 and NOD2 are usually related with the bacterial infections;therefore,it is reasonable to believe that the stronger immune responses observed in the L group might be related with the higher abundance of A.baumannii in the inte stine of Atlantic salmon.Overall,these findings demonstrated that low DO level may induce stronger immunity responses in Atlantic salmon.

Changes of melatonin and its receptors in synchronizing turbot(Scophthalmus maximus)seasonal reproduction and maturation rhythm

In most fish,reproduction is seasonal or periodic under the suitable conditions.In turbot(Scophthalmus maximus)farms,one of the most economically important marine flatfish species,changes in daylength could cause changes in the spawning time.In this study,to characterize the regulation of reproductive physiology following light signals,three melatonin receptors(Mtnr)investigated in turbot were named sm Mtnr1,sm Mtnr2,and sm Mtnr1 c.Distinct expression profiles demonstrated that Mtnr m RNAs were concentrated in the brain(as detected in the hypothalamus(Hy)and mesencephalon(Me)),gonad and eye.The most abundant Mtnr1 and Mtnr2 m RNA expression levels were detected in the central nervous system at the beginning of the breeding season,suggesting that Mtnr1 and Mtnr2 may play vital roles in the regulation of turbot gonadal development.In addition,the melatonin profiles gradually increased and reached to the highest level at the spawning stage,indicating that melatonin is a potent hormone in the regulation of fish oocyte growth and maturation.The results of this study suggested that melatonin is the primary factor that transduces the light signal and regulates the physiological functions of turbot seasonal reproduction.Moreover,the results of this study may establish a foundation for further research seeking to identify fish melatonin receptors involved in the gonadal development and gamete maturation.

Clinical Effect of Yinma Zhisou Decoction Combined with Western Medicine in the Treatment of Acute COPD(Stagnation of PhlegmDampness in Lung)

[Objectives]To explore the effectiveness and safety of Yinma Zhisou Decoction in the treatment of AECOPD with phlegm-heat obstructing lung syndrome,and observe the symptoms of Yinma Zhisou decoction in the treatment of AECOPD patients with phlegm-heat stagnation lung syndrome improvement,inflammatory indicators,lung function,blood gas analysis,etc.[Methods]A total of 92 cases who met the inclusion criteria and exclusion criteria were included in the study according to 1∶1 were randomly divided into treatment group and control group,control group with conventional Western medicine treatment,the treatment group on the basis of control group with Yinma Zhisou decoction treatment,a course of 10 d.The changes in TCM syndrome score,arterial blood gas analysis,pulmonary function,serum inflammatory indicator,mMRC score,and the CAT scores between the two groups after treatment were observed.All collected data were statistically analyzed with SPSS 26.0.[Results](i)Comparison of the curative effect between the two groups.After treatment,the total effective rate of the treatment group was 93.5%,which was higher than that of the control group(76.1%,P<0.05).The curative effect of the treatment group was better than that of the control group(P<0.05).(ii)Comparison of single TCM symptom scores.After treatment,the single TCM symptom scores of the two groups were lower than before(P<0.05),but the improvement of wheezing,cough,phlegm and chest pain in the treatment group was better than that in the control group(P<0.05).There was no significant difference in the improvement of wheezing sound(P>0.05),but there was a trend of difference.(iii)Comparison of mMRC score and CAT score between the two groups.After treatment,the mMRC score and CAT score of the two groups were significantly improved(P<0.05),and the difference was statistically significant.(iv)Comparison of blood gas analysis indicators between the two groups.Intra-group comparison after treatment:PaOof the control group and the treatment group after treatment was significantly improved compared with that before treatment(P<0.05),and the difference was statistically significant.Comparison between the two groups after treatment:PaOand PaCOof the two groups after treatment(P>0.05),and the difference was not statistically significant.It indicated that Yinma Zhisou decoction had more advantages in improving hypoxia.(v)Comparison of pulmonary function between the two groups.After treatment,the FEV1/FVC of the treatment group and the control group was significantly different(P<0.05),and there was a statistical difference(P<0.05).(vi)Comparison of inflammatory indicators between the two groups.Intra-group comparison after treatment:the inflammatory indicators WBC,CRP and PCT in the control group and the treatment group were significantly lower than before treatment(P<0.05),and the differences were statistically significant.It indicated that Yinma Zhisou decoction could effectively control inflammation and reduce inflammation reaction.[Conclusions]Compared with the control group,Yinma Zhisou decoction has obvious advantages in improving cough,expectoration and wheezing,and can significantly improve the total effective rate.Compared with Western medicine alone,Yinma Zhisou decoction can significantly improve patients’hypoxia,reduce mMRC and CAT scores,improve body activity tolerance,improve airway symptoms,and significantly reduce WBC,CRP,PCT and other serum inflammatory indicators.It can be seen that Yinma Zhisou decoction combined with Western medicine treatment is obviously better than simple Western medicine treatment,the curative effect is better,and the safety is better,and there are no serious adverse reactions in the course of the trial.

Clinical Study on the Retention Enema with Modified Dahuang Mudan Decoction in Treating Lower-Jiao Obstruction Syndrome Caused by Severe Pneumonia Complicated with Heart Failure

[Objectives]To treat patients with Lower-Jiao Obstruction Syndrome caused by severe pneumonia complicated with heart failure using the retention enema with Modified Dahuang Mudan Decoction,and to observe the effect and safety of this treatment on inflammatory indicators,cardiac function,gastrointestinal function and multiple organ failure in patients with Lower-Jiao(lower energizer)Obstruction Syndrome caused by severe pneumonia complicated with heart failure.[Methods]54 patients with Lower-Jiao Obstruction Syndrome caused by severe pneumonia complicated with heart failure diagnosed in Nanchong Chinese Medicine Hospital from January 2020 to December 2021 were randomly divided into experimental group(n=27)and control group(n=27).The control group was given conventional treatment combined with 0.9%sodium chloride injection(100 mL)+glycerine enema(40 mL).The treatment group was treated with Modified Dahuang Mudan Decoction on the basis of conventional treatment for 7 d.The efficacy indicators and adverse events such as white blood count(WBC),C-reactive protein(CRP),procalcitonin(PCT),N-terminal pro-brain natriuretic peptide(NT-proBNP),Lausanne Intestinal Failure Estimation(LIFE)and multiple organ dysfunction score(MODS)were observed.[Results](i)There was no significant difference in WBC,PCT,CRP and NT-proBNP between the two groups before treatment.All indicators after treatment were significantly lower than those before treatment in both groups(P<0.05).The levels of WBC,PCT and CRP in the treatment group were lower than those in the control group after treatment(P<0.05),and there was no significant difference in NT-proBNP between the two groups after treatment(P>0.05),but the difference in NT-proBNP before and after treatment in the treatment group was higher than that in the control group.(ii)The LIFE of the two groups decreased significantly after treatment,and the improvement of LIFE of the treatment group was better than that of the control group(P<0.05).(iii)The MODS of the two groups decreased significantly after treatment(P<0.05),and the degree of decrease after treatment in the treatment group was higher than that in the control group(P<0.05).(iv)There was no significant difference in all-cause mortality between the two groups(P>0.05).(v)No serious adverse events were found in both groups during the treatment period.[Conclusions]The conventional treatment,combined with the retention enema with Modified Dahuang Mudan Decoction could further reduce the inflammatory indicators,improve cardiac function,improve intestinal function and organ function,and the safety was good.

Meta-analysis of Therapeutic Efficacy of Purgation and Catharsis Method for Treating Severe Pneumonia

[Objectives]To make a systematic evaluation on the therapeutic efficacy of purgation and catharsis method combined with western medicine in treatment of severe pneumonia.[Methods]The literatures were retrieved from China Knowledge Infrastructure(CNKI),Chinese science and technology journal full-text database(VIP database,VIP),Wanfang Data,the Chinese biomedical database,PubMed,Embase,and the Cochrane Library.The retrieval time was set to the period from the creation of the database to June 2020.The randomized controlled trial(RCT)was conducted on the comparison between the purgation and catharsis method combined with western medicine and the western medicine alone in the treatment of severe pneumonia.The literature information was extracted and the methodological quality of the included literature was evaluated according to the bias risk assessment tool developed by the Cochrane Collaboration.Meta-analysis was performed with the aid of RevMan 5.3 software for the patient response rate,acute physiology and chronic health evaluations II(APACHE II),clinical pulmonary infection score(CPIS),oxygenation index(OI),procalcitonin(PCT),mechanical ventilation time,etc.[Results]A total of 20 articles were included,involving a total of 1661 patients,and the literature quality was low.Meta analysis results showed that compared with the treatment by western medicine alone,the purgation and catharsis method combined with western medicine can further improve the response rate[RR=1.21,95%CI(1.14,1.27),P<0.00001],and reduce the APACHE II score[WMD=-5.92,95%CI(-7.94,-3.89),P<0.00001],reduce CPIS score[WMD=-1.41,95%CI(-1.70,-1.12),P<0.00001],increase oxygenation index[WMD=39.52,95%CI(29.39,49.65),P<0.00001],reduce PCT level[WMD=-2.85,95%CI(-3.68,-2.01),P<0.00001],shorten the mechanical ventilation time[WMD=-13.00,95%CI(-16.51,-9.48),P<0.00001].[Conclusions]Within the scope of the study included,the purgation and catharsis method combined with western medicine in the treatment of severe pneumonia can further reduce the pulmonary infection,reduce PCT levels,increase oxygenation index,and improve vital organ functions,thereby improving clinical efficacy,shortening the mechanical ventilation time(MVT),and reducing the economic burden of patients.

Nanomaterial-based microelectrode arrays for in vitro bidirectional brain–computer interfaces:a review

A bidirectional in vitro brain–computer interface(BCI)directly connects isolated brain cells with the surrounding environment,reads neural signals and inputs modulatory instructions.As a noninvasive BCI,it has clear advantages in understanding and exploiting advanced brain function due to the simplified structure and high controllability of ex vivo neural networks.However,the core of ex vivo BCIs,microelectrode arrays(MEAs),urgently need improvements in the strength of signal detection,precision of neural modulation and biocompatibility.Notably,nanomaterial-based MEAs cater to all the requirements by converging the multilevel neural signals and simultaneously applying stimuli at an excellent spatiotemporal resolution,as well as supporting long-term cultivation of neurons.This is enabled by the advantageous electrochemical characteristics of nanomaterials,such as their active atomic reactivity and outstanding charge conduction efficiency,improving the performance of MEAs.Here,we review the fabrication of nanomaterial-based MEAs applied to bidirectional in vitro BCIs from an interdisciplinary perspective.We also consider the decoding and coding of neural activity through the interface and highlight the various usages of MEAs coupled with the dissociated neural cultures to benefit future developments of BCIs.

Successful transplantation of cryopreserved spermatogonia in Sebastes schlegelii:A simple and suitable alternative approach for conservation of viviparous fish

Black rockfish(Sebastes schlegelii)is one of the most important marine economic viviparous fishes.Recently,germplasm degradation and genetic diversity reduction have occurred due to overfishing and long-term artificial breeding.Germ cell transplantation combined with cryopreservation may be an alternative way to protect genetic resources.However,in viviparous fish that undertake fertilization and embryo development in vivo,transplantation is more difficult than in oviparous fish,including selection of transplantation stage,isolation of germ stem cells,and preparation of sterile recipients.This seriously restricts the development of viviparous transplantation.Therefore,in this study,we aimed to explore a transplantation method suitable for these species.Donor cells were isolated from cryopreserved whole testes of 300–400​g male Sebastes schlegelii in May,labeled by PKH26,and intra-peritoneally transplanted into allogeneic larvae at 5–10 days post-birth.Subsequently,the development of donor-derived cells in recipients were continuously detected by fluorescence labeling,histology,microsatellite markers,and fecundity tests.The results showed that donors were rich in spermatogonia(75%)and recipients maintained a high survival rate after transplantation,with a rate of>20%at sexual maturity.Further,donor-derived cells successfully migrated(100%),colonized,and incorporated into the developing recipient gonad(93.33%).Finally,transplanted recipients could normally develop and differentiate into male and female individuals,with donor-derived gametes found in 65.38%of mature recipients.In the present study,we first establish a simple and suitable transplantation method for Sebastes schlegelii using immature males and specific larvae,which will serve as a promising tool in the protection of germplasm resources for this transplantation-restricted marine viviparous species.

A FAST STOCKPILE SIMULATION ENGINE AND ITS APPLICATION IN MINERAL ORE HANDLING

This paper presents structures and principles of a fast stockpile simulation engine that enhances automatic material process by providing accurate digital information of material quality distribution within stockpiles.Compared with traditional measurementbased approaches,our simulation technology reduces operation cost by eliminating frequent physical measuring;improves operation accuracy through all-time whole-area contour simulation(instead of measuring a few positions of material layers now and then);and speeds the process through fast simulation and instant response to quality information query.Based on simplified grain dynamics and cellular automata models,the technology can achieve real-time/super-real-time simulation,which is critical to be adopted by the industry.Application of the technology in analyzing mineral ores handling is also discussed.

Grid cell remapping under three-dimensional object and social landmarks detected by implantable microelectrode arrays for the medial entorhinal cortex

Grid cells with stable hexagonal firing patterns in the medial entorhinal cortex(MEC)carry the vital function of serving as a metric for the surrounding environment.Whether this mechanism processes only spatial information or involves nonspatial information remains elusive.Here,we fabricated an MEC-shaped microelectrode array(MEA)to detect the variation in neural spikes and local field potentials of the MEC when rats forage in a square enclosure with a planar,three-dimensional object and social landmarks in sequence.The results showed that grid cells exhibited rate remapping under social conditions in which spike firing fields closer to the social landmark had a higher firing rate.Furthermore,global remapping showed that hexagonal firing patterns were rotated and scaled when the planar landmark was replaced with object and social landmarks.In addition,when grid cells were activated,the local field potentials were dominated by the theta band(5–8 Hz),and spike phase locking was observed at troughs of theta oscillations.Our results suggest the pattern separation mechanism of grid cells in which the spatial firing structure and firing rate respond to spatial and social information,respectively,which may provide new insights into how the brain creates a cognitive map.