THE LONG TIME BEHAVIOR OF THE FRACTIONAL ORNSTEIN-UHLENBECK PROCESS WITH LINEAR SELF-REPELLING DRIFT

Let B^(H) be a fractional Brownian motion with Hurst index 1/2≤H<1.In this paper,we consider the equation(called the Ornstein-Uhlenbeck process with a linear self-repelling drift)dX_(t)^(H)=dB_(t)^(H)+σ X_(t)^(H)dt+vdt-θ(∫_(0)^(t)(X_(t)^(H)-X_(s)^(H))ds)dt,whereθ<0,σ,v∈ℝ.The process is an analogue of self-attracting diffusion(Cranston,Le Jan.Math Ann,1995,303:87–93).Our main aim is to study the large time behaviors of the process.We show that the solution X^(H)diverges to infinity as t tends to infinity,and obtain the speed at which the process X^(H)diverges to infinity.

The gap-free genome of mulberry elucidates the architecture and evolution of polycentric chromosomes

Mulberry is a fundamental component of the global sericulture industry,and its positive impact on our health and the environment cannot be overstated.However,the mulberry reference genomes reported previously remained unassembled or unplaced sequences.Here,we report the assembly and analysis of the telomere-to-telomere gap-free reference genome of the mulberry species,Morus notabilis,which has emerged as an important reference in mulberry gene function research and genetic improvement.The mulberry gap-free reference genome produced here provides an unprecedented opportunity for us to study the structure and function of centromeres.Our results revealed that all mulberry centromeric regions share conserved centromeric satellite repeats with different copies.Strikingly,we found that M.notabilis is a species with polycentric chromosomes and the only reported polycentric chromosome species up to now.We propose a compelling model that explains the formation mechanism of new centromeres and addresses the unsolved scientific question of the chromosome fusion-fission cycle in mulberry species.Our study sheds light on the functional genomics,chromosome evolution,and genetic improvement of mulberry species.

Mo doping provokes two electron reaction in MnO_(2)with ultrahigh capacity for aqueous zinc ion batteries

Rechargeable aqueous zinc ion batteries(AZIBs)based on manganese dioxide(MnO_(2))have received much attention for large-scale energy storage applications,however,their energy density is mainly limited by the one-electron reaction of Mn4+/Mn3+redox.Herein,Mo dopedδ-MnO_(2)(Mo-MnO_(2))is prepared and used as a high-performance cathode for AZIBs,which delivers an⇌⇌ultrahigh specific capacity of 652 mAh·g^(−1)at 0.2 A·g^(−1)based on the two-step two-electron redox reaction of Mn^(4+)Mn^(3+)Mn^(2+).Ex-situ structural analysis and density functional theory calculation reveal that the Mo^(5+)dopant plays an important role in enhancing the electronic conductivity of Mo-MnO_(2)and promoting Jahn–Teller distortion of octahedral[MnO_(6)]in ZnMn_(2)O_(4),which facilitates the second step redox reaction of Mn^(3+)/Mn_(2+).This work provides a novel cathode materials design with multi-electron redox chemistry to achieve high energy density in AZIBs.

Long-term functional outcomes improved with deep brain stimulation in patients with disorders of consciousness

Background Deep brain stimulation(DBS)has been preliminarily applied to treat patients with disorders of consciousness(DoCs).The study aimed to determine whether DBS was effective for treating patients with DoC and identify factors related to patients’outcomes.Methods Data from 365 patients with DoCs who were consecutively admitted from 15 July 2011 to 31 December 2021 were retrospectively analysed.Multivariate regression and subgroup analysis were performed to adjust for potential confounders.The primary outcome was improvement in consciousness at 1 year.Results An overall improvement in consciousness at 1 year was achieved in 32.4%(12/37)of the DBS group compared with 4.3%(14/328)of the conservative group.After full adjustment,DBS significantly improved consciousness at 1 year(adjusted OR 11.90,95%CI 3.65-38.46,p<0.001).There was a significant treatment×follow up interaction(H=14.99,p<0.001).DBS had significantly better effects in patients with minimally conscious state(MCS)compared with patients with vegetative state/unresponsive wakefulness syndrome(p for interaction<0.001).A nomogram based on age,state of consciousness,pathogeny and duration of DoCs indicated excellent predictive performance(c-index=0.882).Conclusions DBS was associated with better outcomes in patients with DoC,and the effect was likely to be significantly greater in patients with MCS.DBS should be cautiously evaluated by nomogram preoperatively,and randomised controlled trials are still needed.

Current Status of Neuromodulatory Therapies for Disorders of Consciousness

Treatment for disorders of consciousness （DOCs） is still a Gordian knot. Evidence-based guidelines on the treatment of DOC patients are not currently available, while neuromodulation techniques are seen as a potential treatment. Multiple neuromodulation therapies have been applied. This article reviews the most relevant studies in the literature in order to describe a clear picture of the current state of neuromodulation therapies that could be used to treat DOC patients. Both invasive and noninvasive brain stimulation is discussed. Significant behavioral improvements in prolonged DOCs under neuromodulation therapies are rare. The efficacy of various such therapies remains a matter of debate. Further clinical investigations of existing techniques in larger samples properly controlling for spontaneous recovery are needed, and new approaches are awaited.

Spatial Properties of Mismatch Negativity in Patients with Disorders of Consciousness

In recent decades, event-related potentials have been used for the clinical electrophysiological assessment of patients with disorders of consciousness （DOCs）. In this paper, an oddball paradigm with two types of frequencydeviant stimulus （standard stimuli were pure tones of 1000 Hz; small deviant stimuli were pure tones of 1050 Hz; large deviant stimuli were pure tones of 1200 Hz） was applied to elicit mismatch negativity （MMN） in 30 patients with DOCs diagnosed using the JFK Coma Recovery Scale- Revised （CRS-R）. The results showed that the peak amplitudes of MMN elicited by both large and small deviant stimuli were significantly different from baseline. In terms of the spatial properties of MMN, a significant interaction effect between conditions （small and large deviant stimuli） and electrode nodes was centered at the frontocentral area. Furthermore, correlation coefficients were calculated between MMN amplitudes and CRS-R scores for each electrode among all participants to generate topographic maps. Meanwhile, a significant negative correlation between the MMN amplitudes elicited by large deviant stimuli and the CRS-R scores was also found at the frontocentral area. In consequence, our results combine the above spatial properties of MMN in patients with DOCs, and provide a more precise location （frontocentral area） at which to evaluate the correlation between clinical electrophysiological assessment and the level of consciousness.

脑深部电刺激治疗脑干出血后意识障碍一例报道

脑干出血致死、致残率高,预后较差,是神经外科治疗的难点。脑干出血恢复期常兼有意识障碍(disorders of consciousness,DOC)、感觉运动功能障碍和自主神经功能紊乱等是康复难点。目前,采用脑深部电刺激(deep brain stimulation,DBS)手术治疗DOC已有诸多尝试,并获得良好的治疗效果,但DBS用于脑干出血后DOC的治疗则鲜有报道。笔者认为合理的神经调控手术可以改善部分脑干出血后DOC患者的意识水平。解放军总医院第七医学中心收治1例DBS治疗脑干出血后意识障碍患者,现对其临床资料和诊疗经过报道如下。