Dear Editor,We present a case of acute zonal occult outer retinopathy(AZOOR)complex in a myopic patient with angioid streaks(ASs).A 19-year-old female has been experiencing visual field defects in her left eye for mor...Dear Editor,We present a case of acute zonal occult outer retinopathy(AZOOR)complex in a myopic patient with angioid streaks(ASs).A 19-year-old female has been experiencing visual field defects in her left eye for more than 3y.She was diagnosed with ASs and choroiditis at a local hospital.She has a seven-year history of bilateral high myopia.A fundus examination confirmed the presence of ASs and myopic fundus changes in both eyes.Multimodal imaging revealed an AZOOR complex in the left eye.展开更多
The complexity of the seismicity pattern for the subduction zone along the oceanic plate triggered the outer rise events and revealed cyclic tectonic deformation conditions along the plate subduction zones.The outer r...The complexity of the seismicity pattern for the subduction zone along the oceanic plate triggered the outer rise events and revealed cyclic tectonic deformation conditions along the plate subduction zones.The outer rise earthquakes have been observed along the Sunda arc,following the estimated rupture area of the 2005 M_(W)8.6 Nias earthquakes.Here,we used kinematic waveform inversion(KIWI)to obtain the source parameters of the 14 May 2021 M_(W)6.6 event off the west coast of northern Sumatra and to define the fault plane that triggered this outer rise event.The KIWI algorithm allows two types of seismic source to be configured:the moment tensor model to describe the type of shear with six moment tensor components and the Eikonal model for the rupture of pure double-couple sources.This method was chosen for its flexibility to be applied for different sources of seismicity and also for the automated full-moment tensor solution with real-time monitoring.We used full waveform traces from 8 broadband seismic stations within 1000 km epicentral distances sourced from the Incorporated Research Institutions for Seismology(IRIS-IDA)and Geofon GFZ seismic record databases.The initial origin time and hypocenter values are obtained from the IRIS-IDA.The synthetic seismograms used in the inversion process are based on the existing regional green function database model and were accessed from the KIWI Tools Green's Function Database.The obtained scalar seismic moment value is 1.18×10^(19)N·m,equivalent to a moment magnitude M_(W)6.6.The source parameters are 140°,44°,and−99°for the strike,dip,and rake values at a centroid depth of 10.2 km,indicating that this event is a normal fault earthquake that occurred in the outer rise area.The outer rise events with normal faults typically occur at the shallow part of the plate,with nodal-plane dips predominantly in the range of 30°-60°on the weak oceanic lithosphere due to hydrothermal alteration.The stress regime around the plate subduction zone varies both temporally and spatially due to the cyclic influences of megathrust earthquakes.Tensional outer rise earthquakes tend to occur after the megathrust events.The relative timing of these events is not known due to the viscous relaxation of the down going slab and poroelastic response in the trench slope region.The occurrence of the 14 May 2021 earthquake shows the seismicity in the outer rise region in the strongly coupled Sunda arc subduction zone due to elastic bending stress within the duration of the seismic cycle.展开更多
P-sets is a set pair, it is composed of internal P-set and outer P-set, it has dynamic characteristic. By using structure of P-sets, dependence theorem and identification theorem are proposed in this paper.
Function P-sets are a set pair which are composed of function internal packetsets S F and function outer packet sets S F or (S F , S F ) are function P-sets. Function P-sets have dynamic characteristics and law charac...Function P-sets are a set pair which are composed of function internal packetsets S F and function outer packet sets S F or (S F , S F ) are function P-sets. Function P-sets have dynamic characteristics and law characteristics. Based on function P-sets, P-information law discovery theorems which has attribute supplementing-deleting are given. Mining-discovery and mining-discovery theorems of unknown information law are proposed. Function P-sets are a new theory and new method to research dynamic information laws for information systems.展开更多
A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain unclear.Therefore,we established an animal model of weightlessness via tail suspension to ...A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain unclear.Therefore,we established an animal model of weightlessness via tail suspension to examine the pathological changes and molecular mechanisms of retinal damage under microgravity.After 4 weeks of tail suspension,there were no notable alterations in retinal function and morphology,while after 8 weeks of tail suspension,significant reductions in retinal function were observed,and the outer nuclear layer was thinner,with abundant apoptotic cells.To investigate the mechanism underlying the degenerative changes that occurred in the outer nuclear layer of the retina,proteomics was used to analyze differentially expressed proteins in rat retinas after 8 weeks of tail suspension.The results showed that the expression levels of fibroblast growth factor 2(also known as basic fibroblast growth factor)and glial fibrillary acidic protein,which are closely related to Müller cell activation,were significantly upregulated.In addition,Müller cell regeneration and Müller cell gliosis were observed after 4 and 8 weeks,respectively,of simulated weightlessness.These findings indicate that Müller cells play an important regulatory role in retinal outer nuclear layer degeneration during weightlessness.展开更多
Ownership is an increasingly important conflict in outer space at this moment in time.Despite the principle in the Outer Space Treaty(1967),that emphasizes the importance of all states'free access to outer space b...Ownership is an increasingly important conflict in outer space at this moment in time.Despite the principle in the Outer Space Treaty(1967),that emphasizes the importance of all states'free access to outer space based on equality for exploration and use.Moreover,outer space including the Moon and other celestial bodies is not subject to national appropriation by claim of sovereignty,by means of use or occupation,or by any other means.However,outer space activity is not free from sovereignty and jurisdiction after all.Anyway,the legal situation relating to space resource exploitation and utilization activities under the adoption of United Nations is a challenge.Some scholars implied that the Outer Space Treaty(1967)clearly prohibits appropriation of whole celestial bodies but is far less clear concerning the rights of over-extracted resources.Nevertheless,the Moon Agreement(1979)promotes the idea of property ownership of over-extracted resources.It permits states to collect and remove samples of lunar minerals and other substances for further interest in scientific investigation.The application of the Moon Agreement(1979)is not only to the Moon itself but to other celestial bodies,thus potentially covering the planets and asteroids where the mining potential is considered to be limitless.Under this circumstance,numerous countries,such as the United States,Luxembourg,The United Arab Emirates,and Japan have enacted legal regimes that glorify the rights of their entities in mineral resources in outer space.However,these regimes could be disputed under the international legal framework if countries have merely interpreted and applied their rights and obligations on a national level as they understand them.Therefore,this paper purports to clarify the ownership rights in outer space and analyze the purpose of the legal situation relating to space resource exploitation and utilization activities under the adoption of the United States,Luxembourg,The United Arab Emirates,and Japan.展开更多
AIM:To comprehensively examine the clinical presentations,multimodal images,and long-term follow-up of Chinese patients with acute zonal occult outer retinopathy(AZOOR),a rare inflammatory disorder.METHODS:This was a ...AIM:To comprehensively examine the clinical presentations,multimodal images,and long-term follow-up of Chinese patients with acute zonal occult outer retinopathy(AZOOR),a rare inflammatory disorder.METHODS:This was a retrospective study.A total of 20 patients(32 eyes)were included.The medical records and multimodal imaging,including wide-field fundus photography,wide-field fundus autofluorescence(FAF),and swept-source optical coherence tomography(SS-OCT)were analyzed.RESULTS:The study included 20 patients with a mean age of 38.2±10.9y,and females accounted for 60%.Lesions could involve peripapillary areas,macular region,and peripheral retina.The mean best-corrected visual acuity(BCVA)at presentation was 0.38±0.60 logMAR,with no significant difference in visual acuity between acute cases(within 6mo of onset)and chronic cases(beyond 6mo of onset;P=0.390).There was no statistically significant difference in visual acuity between eyes of acute case(within 6mo of onset)and the chronic case(beyond 6mo of onset).In some chronic case,FAF examination revealed the presence of a hyperautofluorescent(hyperAF)ring around the macular area(6/18),a phenomenon not observed in the acute case(P=0.024).A higher proportion of chronic cases showed predominantly hypoautofluorescent(hypoAF)lesions compared to the acute case(13/18 vs 2/14,P=0.0016).SS-OCT examination showed that both acute and chronic cases exhibited hyperreflective dots above the retinal pigment epithelium(RPE),and ellipsoid zone(EZ)and RPE damage.In the chronic case,eyes with hyperreflective dots above the RPE were more likely to exhibit EZ and RPE damage in the macular region compared to those without these dots.CONCLUSION:Multimodal imaging plays a crucial role in the follow-up of patients with AZOOR.In chronic cases of AZOOR,the presence of hyperreflective dots above the RPE indicates a higher likelihood of outer retinal involvement in the macular region.This study provides critical insights into the complex presentation and progression of AZOOR.展开更多
The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic dem...The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic demand for transformation has emerged within the governance of outer space.Under the leadership of the new wave of space technology revolutions and commercial innovations,outer space governance will undergo a profound transformation.New theories in space law will emerge,engage in long-term competition,and ultimately contribute to the formation of a completely new governance structure.展开更多
Objectives Retinal ischemia-reperfusion(RIR)injury results in irreversible visual impairments.The disruption of the outer blood-retinal barrier(OBRB)is a major ocular pathogenic process that RIR injury affects.Current...Objectives Retinal ischemia-reperfusion(RIR)injury results in irreversible visual impairments.The disruption of the outer blood-retinal barrier(OBRB)is a major ocular pathogenic process that RIR injury affects.Current clinical strategies are limited.This study aimed to elucidate how electroacupuncture(EA)protects the OBRB against RIR injury.Methods Male Wistar rats(7 weeks old,250 g to 280 g)were used in this study.Three independent experiments were conducted.First,Opioid peptide levels were quantified using enzyme-linked immunosorbent assay(ELISA).42 rats were randomly divided into 7 groups(n=6/group):Control:No treatment;high intraocular pressure(HIOP):Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming(Extra acupoint)and Jingming(BL1)for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min;HIOP+100 Hz:RIR injury+100 Hz EA at Xinming and BL1 for 30 min;HIOP+2/100 Hz EA:RIR injury+2/100 Hz EA at Xinming and BL1 for 30 min;HIOP+4/20 Hz EA:RIR injury+4/20 Hz EA at Xinming and BL1 for 30 min.Second,retinal morphology was assessed by hematoxylin and eosin(HE)staining.20 rats were randomly allocated into 4 groups(n=5/group):Control:No treatment;HIOP:Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming and BL1 for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min.Third,the permeability of OBRB was evaluated using the fluorescein isothiocyanate(FITC)-dextran leakage assay.15 rats were randomly divided into 5 groups(n=3/group):Control:No treatment;HIOP:Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming and BL1 for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min;Nal+HIOP+2 Hz EA:Intravitreal injection ofδ-opioid receptor antagonist Naltridole(10µl,100 nM)30 min before RIR injury induction,followed by 2 Hz EA treatment at Xinming and BL1 for 30 min.In vitro studies examined enkephalins'effects on oxygen–glucose deprivation/reperfusion(OGD/R)induced injury in ARPE‐19 cells.Cell viability was evaluated by cell counting kit-8(CCK-8)assay,and morphological changes were recorded by Molecular Devices.Apoptosis was detected by Annexin V-FITC flow cytometry.Delta opioid receptor(DOR)expression in total protein and membrane protein were analyzed by western blotting(WB).Immunofluorescence(IF)staining and WB assessed ZO-1 and Claudin-19.For cell-based assays,n indicates the number of biologically independent replicates.Results It was found that 2 Hz EA treatment increased enkephalins(methionine-enkephalin and leucine-enkephalin)levels(P<0.01),restoring the increased retinal thickness(P<0.05)and mitigating RGCs loss(P<0.05)post-RIR injury.FITC-dextran leakage in the outer retina was ameliorated by 2 Hz EA(P<0.05),reversibly countered by Naltrindole(P<0.05),a DOR antagonist.Treatment with 30µM enkephalins enhanced ARPE-19 cell viability(P<0.001,P<0.0001)and inhibited apoptosis(P<0.0001).Enkephalins elevated DOR levels in total protein(P<0.05)and membrane protein fractions(P<0.001,P<0.0001),as well as elevated ZO-1(P<0.001,P<0.01)and Claudin-19(P<0.0001,P<0.001)levels following OGD/R,counteracted by Naltrindole.Conclusion It was found that 2 Hz EA inhibits the breakdown of OBRB via enkephalins activate DOR in RIR injury.展开更多
Sensitivity encoding(SENSE)is a parallel magnetic resonance imaging(MRI)reconstruction model by utilizing the sensitivity information of receiver coils to achieve image reconstruction.The existing SENSE-based reconstr...Sensitivity encoding(SENSE)is a parallel magnetic resonance imaging(MRI)reconstruction model by utilizing the sensitivity information of receiver coils to achieve image reconstruction.The existing SENSE-based reconstruction algorithms usually used nonadaptive sparsifying transforms,resulting in a limited reconstruction accuracy.Therefore,we proposed a new model for accurate parallel MRI reconstruction by combining the L0 norm regularization term based on the efficient sum of outer products dictionary learning(SOUPDIL)with the SENSE model,called SOUPDIL-SENSE.The SOUPDIL-SENSE model is mainly solved by utilizing the variable splitting and alternating direction method of multipliers techniques.The experimental results on four human datasets show that the proposed algorithm effectively promotes the image sparsity,eliminates the noise and artifacts of the reconstructed images,and improves the reconstruction accuracy.展开更多
The reservoir-monolithic type of the controlled release systems is investigated currently,however,the existing kinetic model could not describe the release process well because the release kinetics is rather complicat...The reservoir-monolithic type of the controlled release systems is investigated currently,however,the existing kinetic model could not describe the release process well because the release kinetics is rather complicated.In this paper,a simplified release kinetic model for diffusion-controlled monolithic matrix coated with outer membrane systems is proposed and verified by the experimental data of mercaptopurinum release experiment.It shows that the model can well describe the release mechanism (the relative error is under 3%) when drug loading (C d) is above its solubility limit (C s).At the same time,the release characteristics of special cases (D mD f and D mD f) are discussed theoretically.When D mD f the release rate becomes constant,namely,zero order release,and the release rate is independent of the drug membrane.This result provides the theoretical basis for the system of zero order release as well as how to control the release rate and the amount of drug release.When D mD f,the release rate is dependent on the drug release coefficient in the monolithic matrix,solubility and drug loading but independent of the process in the outer membrane,and it is similar to monolithic matrix type.展开更多
[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes we...[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes were used as experimental materials to extract OMP by using supersonic schizolysis method and Sarcosyl. After SDS-PAGE electrophoresis, OMP patterns of the extracted products were determined based on the OMP model diagram. [Result] OMP of eight E. coil isolates with three serotypes were divided into three patterns, to be specific, 2 075 isolates respectively belonged to OMP-I and OMP-II pattern, 1 053 isolate belonged to OMP-II pattern, and 5 038 isolates belonged to OMP-I and OMP-III pattern. [Conclusion] Experimental results showed that E. coli isolates with the same serotype may belong to completely different OMP patterns, while serologically unrelated isolates may belong to the same OMP pattern. OMP of E. coil isolates with the same serotype may generate genetic differentiation; in addition, OMP of E. coli isolates with different serotypes may have different genetic correlation.展开更多
Objective: To construct a recombinant plasmid containing the outer membrane protein 2 (Omp2) gene of Chlamydia trachomatis and express Omp2 in E.coli. Methods: The omp2 gene of C. trachomatis serovar D was cloned into...Objective: To construct a recombinant plasmid containing the outer membrane protein 2 (Omp2) gene of Chlamydia trachomatis and express Omp2 in E.coli. Methods: The omp2 gene of C. trachomatis serovar D was cloned into pQE30 vector following PCR amplification from genomic DNA. E. coli M15 transformants were induced to express the fusion protein by IPTG and the product was identified by SDS-PAGE and Western blot. Results: Confirmed by enzyme cleavage analysis and DNA sequencing, a correct recombinant plasmid pQE30/omp2 was constructed. The fusion protein from the transformants was approximately 60 kDa in size in SDS-PAGE analysis, which could specially react with anti-6 X His mouse monoclonal IgG antibodies. Conclusion: We successfully expressed Omp2 in E. coli M15, providing an efficient and simple system for assaying the immunological properties of Omp2.展开更多
AIM:To comprehensively investigate the relationship between outer retinal layer thickness and age in normal eyes.METHODS:One hundred normal eyes of 100 subjects who underwent spectral-domain optical coherence tomograp...AIM:To comprehensively investigate the relationship between outer retinal layer thickness and age in normal eyes.METHODS:One hundred normal eyes of 100 subjects who underwent spectral-domain optical coherence tomography(SD-OCT)were included in this retrospective study.The distances between the external limiting membrane(ELM)line and the photoreceptor inner segment/outer segment(IS/OS)line(ELM-IS/OS),the IS/OS line and the cone outer segment tips(COST)line(IS/OS-COST),the COST line and the retinal pigment epithelium(RPE)complex(COST-RPE)and the full retinal thickness(RT)were measured at the fovea and on four quarters.The relationship between thickness and age or sex was then analysed.RESULTS:A thinner RT was observed in women in a multiple regression analysis(men:234.47±16.79μm;women:223.13±15.43μm).The RT on the nasal quarter and the ELM-IS/OS thickness at the fovea and on the four quarters were significantly and negatively correlated with age.The IS/OS-COST and COST-RPE thicknesses at the fovea and on the four quarters were not significantly correlated with age or sex,respectively.The RT at the fovea was significantly thinner than on the four quarters.The ELM-IS/OS,IS/OS-COST and COST-RPE thicknesses at the fovea were significantly thicker than on the four quarters.CONCLUSION:In normal eyes,the RT thickness on the nasal quarter and the ELM-IS/OS thickness were significantly and negatively correlated with age.The IS/OS-COST and COST-RPE thicknesses were not significantly correlated with age or sex.展开更多
Semi-floating ring bearing（SFRB） is developed to control the vibration of turbocharger rotor. The outer clearance of SFRB affects the magnitude and frequency of nonlinear whirl motion, which is significant for the d...Semi-floating ring bearing（SFRB） is developed to control the vibration of turbocharger rotor. The outer clearance of SFRB affects the magnitude and frequency of nonlinear whirl motion, which is significant for the design of turbocharger. In order to explore the effects of outer clearance, a transient finite element analysis program for rotor and oil film bearing is built and validated by a published experimental case. The nonlinear dynamic behaviors ofrotor-SFRB system are simulated. According to the simulation results, two representative subsynchronous oscillations excited by the two hearings respectively are discovered. As the outer clearance of SFRB increases from 24 ~tm to 60 pro, the low-frequency subsynchronous oscillation experiences three steps, including a strong start, a gradual recession and a combination with the other one. At the same time, the high-frequency subsynchronous oscillation starts to appear gradually, then strengthens, and finally combines. If gravity and unbalance are neglected, the combination will start starts from high rotor speed and extents to low rotor speed, just like a ＂zipper＂. It is found from the quantitative analysis that when the outer clearance increases, the vibration amplitude experiences large value firstly, then reduction, and suddenly increasing after combination. A useful design principle of SFRB outer clearance for minimum vibration amplitude is proposed： the outer clearance value should be chosen to keep the frequency of two subsynchronous oscillations clearly separated and their amplitudes close.展开更多
基金Supported by the National Natural Science Foundation of China(No.82171073).
文摘Dear Editor,We present a case of acute zonal occult outer retinopathy(AZOOR)complex in a myopic patient with angioid streaks(ASs).A 19-year-old female has been experiencing visual field defects in her left eye for more than 3y.She was diagnosed with ASs and choroiditis at a local hospital.She has a seven-year history of bilateral high myopia.A fundus examination confirmed the presence of ASs and myopic fundus changes in both eyes.Multimodal imaging revealed an AZOOR complex in the left eye.
基金supported by the National Natural Science Foundation of China(Grant No.42130312)。
文摘The complexity of the seismicity pattern for the subduction zone along the oceanic plate triggered the outer rise events and revealed cyclic tectonic deformation conditions along the plate subduction zones.The outer rise earthquakes have been observed along the Sunda arc,following the estimated rupture area of the 2005 M_(W)8.6 Nias earthquakes.Here,we used kinematic waveform inversion(KIWI)to obtain the source parameters of the 14 May 2021 M_(W)6.6 event off the west coast of northern Sumatra and to define the fault plane that triggered this outer rise event.The KIWI algorithm allows two types of seismic source to be configured:the moment tensor model to describe the type of shear with six moment tensor components and the Eikonal model for the rupture of pure double-couple sources.This method was chosen for its flexibility to be applied for different sources of seismicity and also for the automated full-moment tensor solution with real-time monitoring.We used full waveform traces from 8 broadband seismic stations within 1000 km epicentral distances sourced from the Incorporated Research Institutions for Seismology(IRIS-IDA)and Geofon GFZ seismic record databases.The initial origin time and hypocenter values are obtained from the IRIS-IDA.The synthetic seismograms used in the inversion process are based on the existing regional green function database model and were accessed from the KIWI Tools Green's Function Database.The obtained scalar seismic moment value is 1.18×10^(19)N·m,equivalent to a moment magnitude M_(W)6.6.The source parameters are 140°,44°,and−99°for the strike,dip,and rake values at a centroid depth of 10.2 km,indicating that this event is a normal fault earthquake that occurred in the outer rise area.The outer rise events with normal faults typically occur at the shallow part of the plate,with nodal-plane dips predominantly in the range of 30°-60°on the weak oceanic lithosphere due to hydrothermal alteration.The stress regime around the plate subduction zone varies both temporally and spatially due to the cyclic influences of megathrust earthquakes.Tensional outer rise earthquakes tend to occur after the megathrust events.The relative timing of these events is not known due to the viscous relaxation of the down going slab and poroelastic response in the trench slope region.The occurrence of the 14 May 2021 earthquake shows the seismicity in the outer rise region in the strongly coupled Sunda arc subduction zone due to elastic bending stress within the duration of the seismic cycle.
基金Supported by the Natural Science Foundation of Zhumadian, Henan, China(11704)Supported by the National Natural Science Foundation of Shandong Province(60973042)Supported by the Natural Science Foundation of Shandong Province(Y2008F61, Y2008G20)
文摘P-sets is a set pair, it is composed of internal P-set and outer P-set, it has dynamic characteristic. By using structure of P-sets, dependence theorem and identification theorem are proposed in this paper.
基金Supported by the Elementary and Advanced Technology Foundation of Henan Province(082300410040, 102300410153)
文摘Function P-sets are a set pair which are composed of function internal packetsets S F and function outer packet sets S F or (S F , S F ) are function P-sets. Function P-sets have dynamic characteristics and law characteristics. Based on function P-sets, P-information law discovery theorems which has attribute supplementing-deleting are given. Mining-discovery and mining-discovery theorems of unknown information law are proposed. Function P-sets are a new theory and new method to research dynamic information laws for information systems.
基金supported by the Army Laboratory Animal Foundation of China,No.SYDW[2020]22(to TC)the Shaanxi Provincial Key R&D Plan General Project of China,No.2022SF-236(to YM)the National Natural Science Foundation of China,No.82202070(to TC)。
文摘A microgravity environment has been shown to cause ocular damage and affect visual acuity,but the underlying mechanisms remain unclear.Therefore,we established an animal model of weightlessness via tail suspension to examine the pathological changes and molecular mechanisms of retinal damage under microgravity.After 4 weeks of tail suspension,there were no notable alterations in retinal function and morphology,while after 8 weeks of tail suspension,significant reductions in retinal function were observed,and the outer nuclear layer was thinner,with abundant apoptotic cells.To investigate the mechanism underlying the degenerative changes that occurred in the outer nuclear layer of the retina,proteomics was used to analyze differentially expressed proteins in rat retinas after 8 weeks of tail suspension.The results showed that the expression levels of fibroblast growth factor 2(also known as basic fibroblast growth factor)and glial fibrillary acidic protein,which are closely related to Müller cell activation,were significantly upregulated.In addition,Müller cell regeneration and Müller cell gliosis were observed after 4 and 8 weeks,respectively,of simulated weightlessness.These findings indicate that Müller cells play an important regulatory role in retinal outer nuclear layer degeneration during weightlessness.
文摘Ownership is an increasingly important conflict in outer space at this moment in time.Despite the principle in the Outer Space Treaty(1967),that emphasizes the importance of all states'free access to outer space based on equality for exploration and use.Moreover,outer space including the Moon and other celestial bodies is not subject to national appropriation by claim of sovereignty,by means of use or occupation,or by any other means.However,outer space activity is not free from sovereignty and jurisdiction after all.Anyway,the legal situation relating to space resource exploitation and utilization activities under the adoption of United Nations is a challenge.Some scholars implied that the Outer Space Treaty(1967)clearly prohibits appropriation of whole celestial bodies but is far less clear concerning the rights of over-extracted resources.Nevertheless,the Moon Agreement(1979)promotes the idea of property ownership of over-extracted resources.It permits states to collect and remove samples of lunar minerals and other substances for further interest in scientific investigation.The application of the Moon Agreement(1979)is not only to the Moon itself but to other celestial bodies,thus potentially covering the planets and asteroids where the mining potential is considered to be limitless.Under this circumstance,numerous countries,such as the United States,Luxembourg,The United Arab Emirates,and Japan have enacted legal regimes that glorify the rights of their entities in mineral resources in outer space.However,these regimes could be disputed under the international legal framework if countries have merely interpreted and applied their rights and obligations on a national level as they understand them.Therefore,this paper purports to clarify the ownership rights in outer space and analyze the purpose of the legal situation relating to space resource exploitation and utilization activities under the adoption of the United States,Luxembourg,The United Arab Emirates,and Japan.
文摘AIM:To comprehensively examine the clinical presentations,multimodal images,and long-term follow-up of Chinese patients with acute zonal occult outer retinopathy(AZOOR),a rare inflammatory disorder.METHODS:This was a retrospective study.A total of 20 patients(32 eyes)were included.The medical records and multimodal imaging,including wide-field fundus photography,wide-field fundus autofluorescence(FAF),and swept-source optical coherence tomography(SS-OCT)were analyzed.RESULTS:The study included 20 patients with a mean age of 38.2±10.9y,and females accounted for 60%.Lesions could involve peripapillary areas,macular region,and peripheral retina.The mean best-corrected visual acuity(BCVA)at presentation was 0.38±0.60 logMAR,with no significant difference in visual acuity between acute cases(within 6mo of onset)and chronic cases(beyond 6mo of onset;P=0.390).There was no statistically significant difference in visual acuity between eyes of acute case(within 6mo of onset)and the chronic case(beyond 6mo of onset).In some chronic case,FAF examination revealed the presence of a hyperautofluorescent(hyperAF)ring around the macular area(6/18),a phenomenon not observed in the acute case(P=0.024).A higher proportion of chronic cases showed predominantly hypoautofluorescent(hypoAF)lesions compared to the acute case(13/18 vs 2/14,P=0.0016).SS-OCT examination showed that both acute and chronic cases exhibited hyperreflective dots above the retinal pigment epithelium(RPE),and ellipsoid zone(EZ)and RPE damage.In the chronic case,eyes with hyperreflective dots above the RPE were more likely to exhibit EZ and RPE damage in the macular region compared to those without these dots.CONCLUSION:Multimodal imaging plays a crucial role in the follow-up of patients with AZOOR.In chronic cases of AZOOR,the presence of hyperreflective dots above the RPE indicates a higher likelihood of outer retinal involvement in the macular region.This study provides critical insights into the complex presentation and progression of AZOOR.
文摘The legal framework for outer space governance,centered on the“Five Major Treaties”,is facing significant challenges.In the face of numerous variables that will shape the future order of outer space,an intrinsic demand for transformation has emerged within the governance of outer space.Under the leadership of the new wave of space technology revolutions and commercial innovations,outer space governance will undergo a profound transformation.New theories in space law will emerge,engage in long-term competition,and ultimately contribute to the formation of a completely new governance structure.
基金Supported by the National Natural Science Foundation of China:81574078。
文摘Objectives Retinal ischemia-reperfusion(RIR)injury results in irreversible visual impairments.The disruption of the outer blood-retinal barrier(OBRB)is a major ocular pathogenic process that RIR injury affects.Current clinical strategies are limited.This study aimed to elucidate how electroacupuncture(EA)protects the OBRB against RIR injury.Methods Male Wistar rats(7 weeks old,250 g to 280 g)were used in this study.Three independent experiments were conducted.First,Opioid peptide levels were quantified using enzyme-linked immunosorbent assay(ELISA).42 rats were randomly divided into 7 groups(n=6/group):Control:No treatment;high intraocular pressure(HIOP):Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming(Extra acupoint)and Jingming(BL1)for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min;HIOP+100 Hz:RIR injury+100 Hz EA at Xinming and BL1 for 30 min;HIOP+2/100 Hz EA:RIR injury+2/100 Hz EA at Xinming and BL1 for 30 min;HIOP+4/20 Hz EA:RIR injury+4/20 Hz EA at Xinming and BL1 for 30 min.Second,retinal morphology was assessed by hematoxylin and eosin(HE)staining.20 rats were randomly allocated into 4 groups(n=5/group):Control:No treatment;HIOP:Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming and BL1 for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min.Third,the permeability of OBRB was evaluated using the fluorescein isothiocyanate(FITC)-dextran leakage assay.15 rats were randomly divided into 5 groups(n=3/group):Control:No treatment;HIOP:Acute intraocular pressure elevation-induced RIR injury;HIOP+SHAM EA:RIR injury+sham EA at Xinming and BL1 for 30 min(shallow needle insertion but without electric stimulation);HIOP+2 Hz EA:RIR injury+2 Hz EA at Xinming and BL1 for 30 min;Nal+HIOP+2 Hz EA:Intravitreal injection ofδ-opioid receptor antagonist Naltridole(10µl,100 nM)30 min before RIR injury induction,followed by 2 Hz EA treatment at Xinming and BL1 for 30 min.In vitro studies examined enkephalins'effects on oxygen–glucose deprivation/reperfusion(OGD/R)induced injury in ARPE‐19 cells.Cell viability was evaluated by cell counting kit-8(CCK-8)assay,and morphological changes were recorded by Molecular Devices.Apoptosis was detected by Annexin V-FITC flow cytometry.Delta opioid receptor(DOR)expression in total protein and membrane protein were analyzed by western blotting(WB).Immunofluorescence(IF)staining and WB assessed ZO-1 and Claudin-19.For cell-based assays,n indicates the number of biologically independent replicates.Results It was found that 2 Hz EA treatment increased enkephalins(methionine-enkephalin and leucine-enkephalin)levels(P<0.01),restoring the increased retinal thickness(P<0.05)and mitigating RGCs loss(P<0.05)post-RIR injury.FITC-dextran leakage in the outer retina was ameliorated by 2 Hz EA(P<0.05),reversibly countered by Naltrindole(P<0.05),a DOR antagonist.Treatment with 30µM enkephalins enhanced ARPE-19 cell viability(P<0.001,P<0.0001)and inhibited apoptosis(P<0.0001).Enkephalins elevated DOR levels in total protein(P<0.05)and membrane protein fractions(P<0.001,P<0.0001),as well as elevated ZO-1(P<0.001,P<0.01)and Claudin-19(P<0.0001,P<0.001)levels following OGD/R,counteracted by Naltrindole.Conclusion It was found that 2 Hz EA inhibits the breakdown of OBRB via enkephalins activate DOR in RIR injury.
基金the National Natural Science Foundation of China(No.61861023)the Yunnan Fundamental Research Project(No.202301AT070452)。
文摘Sensitivity encoding(SENSE)is a parallel magnetic resonance imaging(MRI)reconstruction model by utilizing the sensitivity information of receiver coils to achieve image reconstruction.The existing SENSE-based reconstruction algorithms usually used nonadaptive sparsifying transforms,resulting in a limited reconstruction accuracy.Therefore,we proposed a new model for accurate parallel MRI reconstruction by combining the L0 norm regularization term based on the efficient sum of outer products dictionary learning(SOUPDIL)with the SENSE model,called SOUPDIL-SENSE.The SOUPDIL-SENSE model is mainly solved by utilizing the variable splitting and alternating direction method of multipliers techniques.The experimental results on four human datasets show that the proposed algorithm effectively promotes the image sparsity,eliminates the noise and artifacts of the reconstructed images,and improves the reconstruction accuracy.
文摘The reservoir-monolithic type of the controlled release systems is investigated currently,however,the existing kinetic model could not describe the release process well because the release kinetics is rather complicated.In this paper,a simplified release kinetic model for diffusion-controlled monolithic matrix coated with outer membrane systems is proposed and verified by the experimental data of mercaptopurinum release experiment.It shows that the model can well describe the release mechanism (the relative error is under 3%) when drug loading (C d) is above its solubility limit (C s).At the same time,the release characteristics of special cases (D mD f and D mD f) are discussed theoretically.When D mD f the release rate becomes constant,namely,zero order release,and the release rate is independent of the drug membrane.This result provides the theoretical basis for the system of zero order release as well as how to control the release rate and the amount of drug release.When D mD f,the release rate is dependent on the drug release coefficient in the monolithic matrix,solubility and drug loading but independent of the process in the outer membrane,and it is similar to monolithic matrix type.
基金Supported by China Postdoctoral Science Foundation(20100470565)Science and Technology Support Program of Hebei Province(10960408D)+1 种基金Project of Science and technology Bureau of Shijiazhuang(1150093A)Science and Technology Development Project of Qinhuangdao City(201101A182)~~
文摘[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes were used as experimental materials to extract OMP by using supersonic schizolysis method and Sarcosyl. After SDS-PAGE electrophoresis, OMP patterns of the extracted products were determined based on the OMP model diagram. [Result] OMP of eight E. coil isolates with three serotypes were divided into three patterns, to be specific, 2 075 isolates respectively belonged to OMP-I and OMP-II pattern, 1 053 isolate belonged to OMP-II pattern, and 5 038 isolates belonged to OMP-I and OMP-III pattern. [Conclusion] Experimental results showed that E. coli isolates with the same serotype may belong to completely different OMP patterns, while serologically unrelated isolates may belong to the same OMP pattern. OMP of E. coil isolates with the same serotype may generate genetic differentiation; in addition, OMP of E. coli isolates with different serotypes may have different genetic correlation.
基金This work was supported in part by grants from the Department of Science and Technology of Hunan Province (No. 01SSY2008-6) the Department of Health of Hunan Province (No. B2003-078).
文摘Objective: To construct a recombinant plasmid containing the outer membrane protein 2 (Omp2) gene of Chlamydia trachomatis and express Omp2 in E.coli. Methods: The omp2 gene of C. trachomatis serovar D was cloned into pQE30 vector following PCR amplification from genomic DNA. E. coli M15 transformants were induced to express the fusion protein by IPTG and the product was identified by SDS-PAGE and Western blot. Results: Confirmed by enzyme cleavage analysis and DNA sequencing, a correct recombinant plasmid pQE30/omp2 was constructed. The fusion protein from the transformants was approximately 60 kDa in size in SDS-PAGE analysis, which could specially react with anti-6 X His mouse monoclonal IgG antibodies. Conclusion: We successfully expressed Omp2 in E. coli M15, providing an efficient and simple system for assaying the immunological properties of Omp2.
文摘AIM:To comprehensively investigate the relationship between outer retinal layer thickness and age in normal eyes.METHODS:One hundred normal eyes of 100 subjects who underwent spectral-domain optical coherence tomography(SD-OCT)were included in this retrospective study.The distances between the external limiting membrane(ELM)line and the photoreceptor inner segment/outer segment(IS/OS)line(ELM-IS/OS),the IS/OS line and the cone outer segment tips(COST)line(IS/OS-COST),the COST line and the retinal pigment epithelium(RPE)complex(COST-RPE)and the full retinal thickness(RT)were measured at the fovea and on four quarters.The relationship between thickness and age or sex was then analysed.RESULTS:A thinner RT was observed in women in a multiple regression analysis(men:234.47±16.79μm;women:223.13±15.43μm).The RT on the nasal quarter and the ELM-IS/OS thickness at the fovea and on the four quarters were significantly and negatively correlated with age.The IS/OS-COST and COST-RPE thicknesses at the fovea and on the four quarters were not significantly correlated with age or sex,respectively.The RT at the fovea was significantly thinner than on the four quarters.The ELM-IS/OS,IS/OS-COST and COST-RPE thicknesses at the fovea were significantly thicker than on the four quarters.CONCLUSION:In normal eyes,the RT thickness on the nasal quarter and the ELM-IS/OS thickness were significantly and negatively correlated with age.The IS/OS-COST and COST-RPE thicknesses were not significantly correlated with age or sex.
基金Supported by National Natural Science Foundation of China(Grant No51506108)
文摘Semi-floating ring bearing（SFRB） is developed to control the vibration of turbocharger rotor. The outer clearance of SFRB affects the magnitude and frequency of nonlinear whirl motion, which is significant for the design of turbocharger. In order to explore the effects of outer clearance, a transient finite element analysis program for rotor and oil film bearing is built and validated by a published experimental case. The nonlinear dynamic behaviors ofrotor-SFRB system are simulated. According to the simulation results, two representative subsynchronous oscillations excited by the two hearings respectively are discovered. As the outer clearance of SFRB increases from 24 ~tm to 60 pro, the low-frequency subsynchronous oscillation experiences three steps, including a strong start, a gradual recession and a combination with the other one. At the same time, the high-frequency subsynchronous oscillation starts to appear gradually, then strengthens, and finally combines. If gravity and unbalance are neglected, the combination will start starts from high rotor speed and extents to low rotor speed, just like a ＂zipper＂. It is found from the quantitative analysis that when the outer clearance increases, the vibration amplitude experiences large value firstly, then reduction, and suddenly increasing after combination. A useful design principle of SFRB outer clearance for minimum vibration amplitude is proposed： the outer clearance value should be chosen to keep the frequency of two subsynchronous oscillations clearly separated and their amplitudes close.
