In a brand new era,with chaotic scenario that exists within the world,people are undermined with diverse psychological assaults.There have been numerous sensible approaches on the way to understand and lessen those at...In a brand new era,with chaotic scenario that exists within the world,people are undermined with diverse psychological assaults.There have been numerous sensible approaches on the way to understand and lessen those attacks.Bioscrypt developments have verified to be one of the beneficial approaches for intercepting these troubles.Identifying recognition through human iris organ is said as one of the well-known biometric strategies because of its reliability and higher accurate return in comparison to different developments.Reviewing beyond literatures,terrible imaging condition,low flexibility of version,and small length iris image dataset are the constraints desiring solutions.Among these kinds of developments,the iris popularity structures are suitable gear for the human identification.Iris popularity has been an energetic studies location for the duration of previous couple of decades,due to its extensive packages in the areas,from airports to native land protection border protection.In the past,various functions and methods for iris recognition have been presented.Despite of the very fact that there are many approaches published in this field,there are still liberal amount of problems in this methodology like tedious and computational intricacy.We suggest an all-encompassing deep learning architecture for iris recognition supported by a genetic algorithm and a wavelet transformation,which may jointly learn the feature representation and perform recognition to realize high efficiency.With just a few training photos from each class,we train our model on a well-known iris recognition dataset and demonstrate improvements over prior methods.We think that this architecture can be frequently employed for various biometric recognition jobs,assisting in the development of a more scalable and precise system.The exploratory aftereffects of the proposed technique uncover that the strategy is effective inside the iris acknowledgment.展开更多
AIM:To preliminary explore the safety and effectiveness of artificial iris implantation.METHODS:Fourteen patients with iris defects who underwent artificial iris implantation at Hainan Boao Super Hospital from June 20...AIM:To preliminary explore the safety and effectiveness of artificial iris implantation.METHODS:Fourteen patients with iris defects who underwent artificial iris implantation at Hainan Boao Super Hospital from June 2020 to September 2021 were retrospectively analyzed for safety and effectiveness of the surgery by comparing the preoperative and postoperative best-corrected visual acuity(BCVA),intraocular pressure(IOP),corneal endothelial cell density(ECD),ocular axial length(AL),anterior chamber depth(ACD),patient satisfaction of photophobia and appearance improvement,and postoperative complications.RESULTS:The mean age was 37.21±14.85(7-60)y,including 13 males and 1 female.The mean follow-up period was 4.64±2.32(1-10)mo.The mean AL was 24.00±1.06(21.68-25.58)mm.The postoperative mean anterior chamber depth measured was 4.07±0.75(2.61-5.07)mm.The mean BCVA was 0.69±0.65 logMAR preoperatively and 0.46±0.60 logMAR at the last follow-up time(P=0.36).There was no significant differences in the IOP preoperative and postoperative(14.14±3.10 and 13.65±3.08 mm Hg,respectively,P=0.69).The preoperative ECD was 1674.09±566.11 per 1 mm^(2),and the postoperative ECD was 1439.45±425.15 per 1 mm^(2)(P=0.21).No obvious corneal opacity or corneal decompensation was observed in all patients.The preoperative and postoperative photophobia scores were 8.50±1.55 and 4.50±1.94,respectively(P<0.05),and the preoperative and postoperative appearance defect scores were 6.58±2.98 and 2.75±1.69,respectively(P<0.05).Among the 14 patients,one had artificial iris displacement,two had a transient IOP rise after treatment of antiglaucomatous eyedrops.No complications were observed during surgery.CONCLUSION:The novel artificial iris material is safe,which can significantly improve the appearance defects and photophobia,improve the postoperative visual acuity to a certain extent.This surgery had a high patient satisfaction rate with few and controllable postoperative complications.At the same time,the artificial iris,with its diverse configurations,variable colors,arbitrary cutting,and various surgical procedures,fully realizes personalized treatment,which solves the clinical problem of iris defect.展开更多
The mutualistic symbiotic system formed by clumping arbuscular mycorrhizal fungi(AMF)and plants can remediate heavy metal-contaminated soils.However,the specific mechanisms underlying the interaction between AMF and i...The mutualistic symbiotic system formed by clumping arbuscular mycorrhizal fungi(AMF)and plants can remediate heavy metal-contaminated soils.However,the specific mechanisms underlying the interaction between AMF and inter-root microbial communities,particularly their impact on organic phosphorus(P)cycling,remain unclear.This study investigated the gene regulation processes involved in inter-root soil phosphorus cycling in wetland plants,specifically Iris tectorum,following inoculation with AMF under varying concentrations of chromium(Cr)stress.Through macro-genome sequencing,we analyzed the composition and structure of the inter-root soil microbial community associated with Iris tectorum under greenhouse pot conditions.The results demonstrated significant changes in the diversity and composition of the inter-root soil microbial community following AMF inoculation,with Proteobacteria,Actinobacteria,Chloroflexi,Acidobacteria,and Bacteroidetes being the dominant taxa.Under Cr stress,species and gene co-occurrence network analysis revealed that AMF promoted the transformation process of organic phosphorus mineralization and facilitated inorganic phosphorus uptake.Additionally,network analysis of functional genes indicated strong aggregation of(pstS,pstA,pstC,TC.PIT,phoR,pp-gppA)genes,which collectively enhanced phosphorus uptake by plants.These findings shed light on the inter-root soil phosphorus cycling process during the co-remediation of Cr-contaminated soil by AMF-Iris tectorum symbiosis,providing valuable theoretical support for the application of AMF-wetland plant symbiosis systems to remediate heavy metal-contaminated soil.展开更多
Iris sanguinea Donn ex Horn.is a common perennial ornamental herb in Northeast China due to its strong cold-resistance capacity.In this study,integrative analyses of metabolomics and transcriptomics data were performe...Iris sanguinea Donn ex Horn.is a common perennial ornamental herb in Northeast China due to its strong cold-resistance capacity.In this study,integrative analyses of metabolomics and transcriptomics data were performed on five cultivars of I.sanguinea with varying petal colors to elucidate the molecular basis underlying petal pigmentation.The metabolomics data revealed that a total of five major anthocyanins were responsible for petal pigmentation in I.sanguinea.While two delphinidin-3-O-glucoside derivatives contributed to blue coloration in petals,two petunidin-3-O-glucoside and cyanidin-3-O-rutinoside derivatives exhibited significantly higher abundances in the deep pink petals.In addition,transcriptomics revealed a gradual increase in the expression of a large set of genes involved in flavonoid and anthocyanin biosynthesis pathways,corresponding to the varying levels of anthocyanin content among cultivar petals.Integrated metabolomics and transcriptomics analysis further led to the discovery of molecular modules controlling petal pigmentation,in which an R2R3 MYB transcription factor IsMYBL1 was found to be associated with the accumulation of key anthocyanin derivatives,it localized to the nucleus.The regulatory role of IsMYBL1 in anthocyanin accumulation has been validated through overexpressing in tobacco and knockdown in I.sanguinea using an improved virusinduced gene silencing(VIGS)approach.Finally,BiFC and Y2H showed that IsMYBL1 interacts with IsEGL3 and IsTTG1 to activate the expression of genes involved in anthocyanin biosynthesis,Yeast one-hybrid,dual-luciferase assays,showed that IsMYBL1 significantly increased anthocyanin contents in I.sanguinea by promoting the expression of IsANS,thereby promoting anthocyanin accumulation.Taken together,our study has provided a comprehensive molecular profiling of petal coloration in I.sanguinea and revealed key gene/metabolite networks that determine petal pigmentation.展开更多
AIM:To compare the efficacy of different administration regimens of compound tropicamide eyedrops(CTE)for pupil dilation for children with dark iris.METHODS:A prospective,comparative,randomized interventional study wa...AIM:To compare the efficacy of different administration regimens of compound tropicamide eyedrops(CTE)for pupil dilation for children with dark iris.METHODS:A prospective,comparative,randomized interventional study was conducted.Children in Group 1 received CTE 3 times with a 3min interval between each application.Children in Group 2 received CTE 4 times with a 5min interval between each application.We measured their pupil diameters at baseline(pre-drug instillation)and 30min and 60min post-drug instillation and assessed the pupillary light reflex at 60min post-drug instillation.RESULTS:In total,194 eyes of 101 children were enrolled.The changes of pupil diameter at 30min and 60min post-drug instillation were 1.2±0.6 mm and 2.3±1.0 mm in Group 1,and 2.3±0.9 mm and 3.7±1.0 mm in Group 2,respectively.Group 2 showed a larger change in pupil size than Group 1 at 30min(P<0.01)and 60min(P<0.01).The effect of pupil dilation in Group 2 was 1.25 times that in Group 1.The change in pupil size was positively associated with age.A higher proportion of children in Group 1 had smaller pupil diameter and reactive pupils at the final time point,with only 33 children(33.7%)had final pupil size≥6.5 mm,and only 9 children(9.2%)had non-reactive pupils.Children in Group 2 achieved larger pupil diameter and more nonreactive pupils at the final time point,with 84 children(87.5%)had final pupil size≥6.5 mm,and only 22 children(22.9%)had reactive pupils.CONCLUSION:Increasing the frequency of compound tropicamide and lengthening the interval between eye drop applications can produce stronger mydriatic effects.展开更多
In northern China,light and temperature are major limiting factors for plant growth,particularly during seed production and seedling establishment.While previous studies suggested a possible role for the MYB97 gene in...In northern China,light and temperature are major limiting factors for plant growth,particularly during seed production and seedling establishment.While previous studies suggested a possible role for the MYB97 gene in cold-stress,confirmation through documented evidence was lacking.In this study,we transformed the MYB97 gene from Iris laevigata into tobacco,and discovered that the gene boosted photosynthesis,photoprotection and resilience to cold.The transgenic tobacco seeds exhibited enhanced germination and accelerated seedling growth.Moreover,these plants had decreased levels of MDA(Malondialdehyde)and relative conductance,coupled with elevated concentrations of proline and soluble sugars.This response was accompanied by heightened activity of antioxidant enzymes during periods of cold stress(4 and−2℃).Exposure to low temperatures(0–15℃)also reduced heights but accentuated primary root growth in transgenic tobacco plants.Additionally,tobacco leaves showed an increased growth along with higher chlorophyll levels,net photosynthetic rates,stomatal conductance,transpiration rates and non-photochemical quenching coefficient.This study shows that IlMYB97(The MYB97 genes in I.laevigata)improves cold-resistance,and enhances photosynthesis and photoprotective ability,and thus overall growth and development.These findings would offer the genetic resources to further study cold resistance and photosynthesis.展开更多
Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optic...Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.展开更多
A new method for iris recognition using a multi-matching system based on a simplified deformable model of the human iris was proposed. The method defined iris feature points and formed the feature space based on a wa...A new method for iris recognition using a multi-matching system based on a simplified deformable model of the human iris was proposed. The method defined iris feature points and formed the feature space based on a wavelet transform. In the matching stage it worked in a crude manner. Driven by a simplified deformable iris model, the crude matching was refined. By means of such multi-matching system, the task of iris recognition was accomplished. This process can preserve the elastic deformation between an input iris image and a template and improve precision for iris recognition. The experimental results indicate the va- lidity of this method.展开更多
The goal of this paper is to propose a fast and accurate iris pattern recognition system by using wireless network system. This paper consists of three parts: the first part includes two methods of the iris pattern re...The goal of this paper is to propose a fast and accurate iris pattern recognition system by using wireless network system. This paper consists of three parts: the first part includes two methods of the iris pattern recognition system: Libor Masek and genetic algorithms, the second part includes the compression-decompression process of iris image using Principal Component Analysis (PCA) as a data reduction method, in order to reduce image size, and the third part talks about wireless network. In this work, an iris image is transferred across wireless network which contains two independent-parallel lines connected to the central Personal Computer (PC) in order to be recognized at the end of each line, then the results of recognition are sent back to the central PC. The proposed genetic algorithm, which is used in this paper is more accurate than Masek algorithm and has low computational time and complexity, which makes this method better than Masek method in recognizing iris patterns.展开更多
Iris sangumea Dorm ex Horn. is a perennial cold-tolerant herbs of the Iris genus of Iridaceae, which has a well-formed, bright color and adaptability. Through understanding the fl ower bud differentiation, Sporogenesi...Iris sangumea Dorm ex Horn. is a perennial cold-tolerant herbs of the Iris genus of Iridaceae, which has a well-formed, bright color and adaptability. Through understanding the fl ower bud differentiation, Sporogenesis, gametogenesis, fertilization and embryogenesis of I. sangumea, we developed fl owering regulation and control breeding. I. sangumea fl ower bud differentiation was observed in April for 21 days; in this stage, the early differentiation process was slow, temperature was more than 5 °C, if the temperature is shorter than this, most fl ower bud will have no differentiation, and turn to vegetative growth; later differentiation is faster and required temperature is from 5 to 8 °C and gradually rose to 10-12 °C. The temperature in April plays the defi nitely role in the number of bud differentiation. Three stamina contain tetrasporangiate anthers and a glandular tapetum. The anther wall is composed of four cell layers inclduding the epidermis, the endothecium, one middle layer and the secretory tapetum. The type of anther wall development the dicotyledonous type. After pollen maturation, the anther wall forms a double-layer containing only epidermis and endothecium. Simultaneous cytokinesis is of the continuous type during meiosis of microspore mother cell results in a zygomorphous or tetragonal tetrad. Mature pollen grains are two-celled. I. sangumea ’s stylar canal is hollow, open type style, and the gynoecium has three carpels. The ovaries have axial placentas. The ovule is anatropous, bitegmic and crassinucellate. The primary sporogenous cell differentiates directly as the megaspore. The megaspore tetrads are linear, T-shaped or juxtaposed. Generally, the fi rst of the tetrad megaspores at the chalaza becomes functional while the other three degenerate. A mature embryo sac with seven cells and eight nuclei embryo sac is of the polygonum type. For dichogamy, the male gametophyte matures about 2 days earlier than the female gametophyte. The pollen tube entered into the embryo sac for 22–24 h after pollination. The dormancy stage of fertilized ovules is 5-6 days, and the fusion of sperm and egg nucleus is of the premitotic type. The primary endosperm cell has shorter dormancy of 4-6 days, and endosperm formation is of the nuclear type.展开更多
Biometric verification has become essential to authenticate the individuals in public and private places.Among several biometrics,iris has peculiar features and its working mechanism is complex in nature.The recent de...Biometric verification has become essential to authenticate the individuals in public and private places.Among several biometrics,iris has peculiar features and its working mechanism is complex in nature.The recent developments in Machine Learning and Deep Learning approaches enable the development of effective iris recognition models.With this motivation,the current study introduces a novel Chaotic Krill Herd with Deep Transfer Learning Based Biometric Iris Recognition System(CKHDTL-BIRS).The presented CKHDTL-BIRS model intends to recognize and classify iris images as a part of biometric verification.To achieve this,CKHDTL-BIRS model initially performs Median Filtering(MF)-based preprocessing and segmentation for iris localization.In addition,MobileNetmodel is also utilized to generate a set of useful feature vectors.Moreover,Stacked Sparse Autoencoder(SSAE)approach is applied for classification.At last,CKH algorithm is exploited for optimization of the parameters involved in SSAE technique.The proposed CKHDTL-BIRS model was experimentally validated using benchmark dataset and the outcomes were examined under several aspects.The comparison study results established the enhanced performance of CKHDTL-BIRS technique over recent approaches.展开更多
Due to complex computation and poor real-time performance of the traditional iris recognition system,iris feature is extracted by using amplitude and phase information of the mean image blocks based on Gabor filtering...Due to complex computation and poor real-time performance of the traditional iris recognition system,iris feature is extracted by using amplitude and phase information of the mean image blocks based on Gabor filtering on image,and the k-nearest neighbor algorithm is combined to complete iris recognition function.The recognition reduces the recognition time and improves the recognition accuracy.At the same time,identification result is transmitted to the cloud server through ZigBee network to solve diffcult wiring problem.The experiment shows the system runs stably and has fast recognition speed.It has been applied to a security system.展开更多
With the rapid spread of the coronavirus epidemic all over the world,educational and other institutions are heading towards digitization.In the era of digitization,identifying educational e-platform users using ear an...With the rapid spread of the coronavirus epidemic all over the world,educational and other institutions are heading towards digitization.In the era of digitization,identifying educational e-platform users using ear and iris based multi-modal biometric systems constitutes an urgent and interesting research topic to pre-serve enterprise security,particularly with wearing a face mask as a precaution against the new coronavirus epidemic.This study proposes a multimodal system based on ear and iris biometrics at the feature fusion level to identify students in electronic examinations(E-exams)during the COVID-19 pandemic.The proposed system comprises four steps.Thefirst step is image preprocessing,which includes enhancing,segmenting,and extracting the regions of interest.The second step is feature extraction,where the Haralick texture and shape methods are used to extract the features of ear images,whereas Tamura texture and color histogram methods are used to extract the features of iris images.The third step is feature fusion,where the extracted features of the ear and iris images are combined into one sequential fused vector.The fourth step is the matching,which is executed using the City Block Dis-tance(CTB)for student identification.Thefindings of the study indicate that the system’s recognition accuracy is 97%,with a 2%False Acceptance Rate(FAR),a 4%False Rejection Rate(FRR),a 94%Correct Recognition Rate(CRR),and a 96%Genuine Acceptance Rate(GAR).In addition,the proposed recognition sys-tem achieved higher accuracy than other related systems.展开更多
文摘In a brand new era,with chaotic scenario that exists within the world,people are undermined with diverse psychological assaults.There have been numerous sensible approaches on the way to understand and lessen those attacks.Bioscrypt developments have verified to be one of the beneficial approaches for intercepting these troubles.Identifying recognition through human iris organ is said as one of the well-known biometric strategies because of its reliability and higher accurate return in comparison to different developments.Reviewing beyond literatures,terrible imaging condition,low flexibility of version,and small length iris image dataset are the constraints desiring solutions.Among these kinds of developments,the iris popularity structures are suitable gear for the human identification.Iris popularity has been an energetic studies location for the duration of previous couple of decades,due to its extensive packages in the areas,from airports to native land protection border protection.In the past,various functions and methods for iris recognition have been presented.Despite of the very fact that there are many approaches published in this field,there are still liberal amount of problems in this methodology like tedious and computational intricacy.We suggest an all-encompassing deep learning architecture for iris recognition supported by a genetic algorithm and a wavelet transformation,which may jointly learn the feature representation and perform recognition to realize high efficiency.With just a few training photos from each class,we train our model on a well-known iris recognition dataset and demonstrate improvements over prior methods.We think that this architecture can be frequently employed for various biometric recognition jobs,assisting in the development of a more scalable and precise system.The exploratory aftereffects of the proposed technique uncover that the strategy is effective inside the iris acknowledgment.
文摘AIM:To preliminary explore the safety and effectiveness of artificial iris implantation.METHODS:Fourteen patients with iris defects who underwent artificial iris implantation at Hainan Boao Super Hospital from June 2020 to September 2021 were retrospectively analyzed for safety and effectiveness of the surgery by comparing the preoperative and postoperative best-corrected visual acuity(BCVA),intraocular pressure(IOP),corneal endothelial cell density(ECD),ocular axial length(AL),anterior chamber depth(ACD),patient satisfaction of photophobia and appearance improvement,and postoperative complications.RESULTS:The mean age was 37.21±14.85(7-60)y,including 13 males and 1 female.The mean follow-up period was 4.64±2.32(1-10)mo.The mean AL was 24.00±1.06(21.68-25.58)mm.The postoperative mean anterior chamber depth measured was 4.07±0.75(2.61-5.07)mm.The mean BCVA was 0.69±0.65 logMAR preoperatively and 0.46±0.60 logMAR at the last follow-up time(P=0.36).There was no significant differences in the IOP preoperative and postoperative(14.14±3.10 and 13.65±3.08 mm Hg,respectively,P=0.69).The preoperative ECD was 1674.09±566.11 per 1 mm^(2),and the postoperative ECD was 1439.45±425.15 per 1 mm^(2)(P=0.21).No obvious corneal opacity or corneal decompensation was observed in all patients.The preoperative and postoperative photophobia scores were 8.50±1.55 and 4.50±1.94,respectively(P<0.05),and the preoperative and postoperative appearance defect scores were 6.58±2.98 and 2.75±1.69,respectively(P<0.05).Among the 14 patients,one had artificial iris displacement,two had a transient IOP rise after treatment of antiglaucomatous eyedrops.No complications were observed during surgery.CONCLUSION:The novel artificial iris material is safe,which can significantly improve the appearance defects and photophobia,improve the postoperative visual acuity to a certain extent.This surgery had a high patient satisfaction rate with few and controllable postoperative complications.At the same time,the artificial iris,with its diverse configurations,variable colors,arbitrary cutting,and various surgical procedures,fully realizes personalized treatment,which solves the clinical problem of iris defect.
基金supported by 2024 Guizhou Basic Research Plan(Natural Science)Project,China(Foundation of Guizhou science cooperation-ZK[2024]General 490)the National Natural Science Foundation of China(No.31560107).
文摘The mutualistic symbiotic system formed by clumping arbuscular mycorrhizal fungi(AMF)and plants can remediate heavy metal-contaminated soils.However,the specific mechanisms underlying the interaction between AMF and inter-root microbial communities,particularly their impact on organic phosphorus(P)cycling,remain unclear.This study investigated the gene regulation processes involved in inter-root soil phosphorus cycling in wetland plants,specifically Iris tectorum,following inoculation with AMF under varying concentrations of chromium(Cr)stress.Through macro-genome sequencing,we analyzed the composition and structure of the inter-root soil microbial community associated with Iris tectorum under greenhouse pot conditions.The results demonstrated significant changes in the diversity and composition of the inter-root soil microbial community following AMF inoculation,with Proteobacteria,Actinobacteria,Chloroflexi,Acidobacteria,and Bacteroidetes being the dominant taxa.Under Cr stress,species and gene co-occurrence network analysis revealed that AMF promoted the transformation process of organic phosphorus mineralization and facilitated inorganic phosphorus uptake.Additionally,network analysis of functional genes indicated strong aggregation of(pstS,pstA,pstC,TC.PIT,phoR,pp-gppA)genes,which collectively enhanced phosphorus uptake by plants.These findings shed light on the inter-root soil phosphorus cycling process during the co-remediation of Cr-contaminated soil by AMF-Iris tectorum symbiosis,providing valuable theoretical support for the application of AMF-wetland plant symbiosis systems to remediate heavy metal-contaminated soil.
基金supported by the National Science Foundation(Grant No.31670344)the Fundamental Research Funds for the Central Universities(Grant No.2572023CT18)the Natural Fund Project of Heilongjiang Province(Grant No.LH2020C044).
文摘Iris sanguinea Donn ex Horn.is a common perennial ornamental herb in Northeast China due to its strong cold-resistance capacity.In this study,integrative analyses of metabolomics and transcriptomics data were performed on five cultivars of I.sanguinea with varying petal colors to elucidate the molecular basis underlying petal pigmentation.The metabolomics data revealed that a total of five major anthocyanins were responsible for petal pigmentation in I.sanguinea.While two delphinidin-3-O-glucoside derivatives contributed to blue coloration in petals,two petunidin-3-O-glucoside and cyanidin-3-O-rutinoside derivatives exhibited significantly higher abundances in the deep pink petals.In addition,transcriptomics revealed a gradual increase in the expression of a large set of genes involved in flavonoid and anthocyanin biosynthesis pathways,corresponding to the varying levels of anthocyanin content among cultivar petals.Integrated metabolomics and transcriptomics analysis further led to the discovery of molecular modules controlling petal pigmentation,in which an R2R3 MYB transcription factor IsMYBL1 was found to be associated with the accumulation of key anthocyanin derivatives,it localized to the nucleus.The regulatory role of IsMYBL1 in anthocyanin accumulation has been validated through overexpressing in tobacco and knockdown in I.sanguinea using an improved virusinduced gene silencing(VIGS)approach.Finally,BiFC and Y2H showed that IsMYBL1 interacts with IsEGL3 and IsTTG1 to activate the expression of genes involved in anthocyanin biosynthesis,Yeast one-hybrid,dual-luciferase assays,showed that IsMYBL1 significantly increased anthocyanin contents in I.sanguinea by promoting the expression of IsANS,thereby promoting anthocyanin accumulation.Taken together,our study has provided a comprehensive molecular profiling of petal coloration in I.sanguinea and revealed key gene/metabolite networks that determine petal pigmentation.
基金Supported by the National Natural Science Foundation of China(No.82371093,No.72342015)R&D Program of Beijing Municipal Education Commission(No.KZ202110025039).
文摘AIM:To compare the efficacy of different administration regimens of compound tropicamide eyedrops(CTE)for pupil dilation for children with dark iris.METHODS:A prospective,comparative,randomized interventional study was conducted.Children in Group 1 received CTE 3 times with a 3min interval between each application.Children in Group 2 received CTE 4 times with a 5min interval between each application.We measured their pupil diameters at baseline(pre-drug instillation)and 30min and 60min post-drug instillation and assessed the pupillary light reflex at 60min post-drug instillation.RESULTS:In total,194 eyes of 101 children were enrolled.The changes of pupil diameter at 30min and 60min post-drug instillation were 1.2±0.6 mm and 2.3±1.0 mm in Group 1,and 2.3±0.9 mm and 3.7±1.0 mm in Group 2,respectively.Group 2 showed a larger change in pupil size than Group 1 at 30min(P<0.01)and 60min(P<0.01).The effect of pupil dilation in Group 2 was 1.25 times that in Group 1.The change in pupil size was positively associated with age.A higher proportion of children in Group 1 had smaller pupil diameter and reactive pupils at the final time point,with only 33 children(33.7%)had final pupil size≥6.5 mm,and only 9 children(9.2%)had non-reactive pupils.Children in Group 2 achieved larger pupil diameter and more nonreactive pupils at the final time point,with 84 children(87.5%)had final pupil size≥6.5 mm,and only 22 children(22.9%)had reactive pupils.CONCLUSION:Increasing the frequency of compound tropicamide and lengthening the interval between eye drop applications can produce stronger mydriatic effects.
基金supported by the Science and Technology Basic Resources Investigation Program of China(2019FY100500)the Fun-damental Research Funds for the Central Universities(2572023CT18)the Natural Fund Project of Heilongjiang Province(LH 2020C 044).
文摘In northern China,light and temperature are major limiting factors for plant growth,particularly during seed production and seedling establishment.While previous studies suggested a possible role for the MYB97 gene in cold-stress,confirmation through documented evidence was lacking.In this study,we transformed the MYB97 gene from Iris laevigata into tobacco,and discovered that the gene boosted photosynthesis,photoprotection and resilience to cold.The transgenic tobacco seeds exhibited enhanced germination and accelerated seedling growth.Moreover,these plants had decreased levels of MDA(Malondialdehyde)and relative conductance,coupled with elevated concentrations of proline and soluble sugars.This response was accompanied by heightened activity of antioxidant enzymes during periods of cold stress(4 and−2℃).Exposure to low temperatures(0–15℃)also reduced heights but accentuated primary root growth in transgenic tobacco plants.Additionally,tobacco leaves showed an increased growth along with higher chlorophyll levels,net photosynthetic rates,stomatal conductance,transpiration rates and non-photochemical quenching coefficient.This study shows that IlMYB97(The MYB97 genes in I.laevigata)improves cold-resistance,and enhances photosynthesis and photoprotective ability,and thus overall growth and development.These findings would offer the genetic resources to further study cold resistance and photosynthesis.
基金Key Research and Development Projects of Zhejiang Science and Technology Plan(No.2021C03103)Research and Development Plan of Zhejiang Science and Technology Department(No.2023C03089)Scientific Research Project of Zhejiang Provincial Department of Education(No.Y202456401)。
文摘Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.
文摘A new method for iris recognition using a multi-matching system based on a simplified deformable model of the human iris was proposed. The method defined iris feature points and formed the feature space based on a wavelet transform. In the matching stage it worked in a crude manner. Driven by a simplified deformable iris model, the crude matching was refined. By means of such multi-matching system, the task of iris recognition was accomplished. This process can preserve the elastic deformation between an input iris image and a template and improve precision for iris recognition. The experimental results indicate the va- lidity of this method.
文摘The goal of this paper is to propose a fast and accurate iris pattern recognition system by using wireless network system. This paper consists of three parts: the first part includes two methods of the iris pattern recognition system: Libor Masek and genetic algorithms, the second part includes the compression-decompression process of iris image using Principal Component Analysis (PCA) as a data reduction method, in order to reduce image size, and the third part talks about wireless network. In this work, an iris image is transferred across wireless network which contains two independent-parallel lines connected to the central Personal Computer (PC) in order to be recognized at the end of each line, then the results of recognition are sent back to the central PC. The proposed genetic algorithm, which is used in this paper is more accurate than Masek algorithm and has low computational time and complexity, which makes this method better than Masek method in recognizing iris patterns.
基金supported by the National Natural Science Foundation of China(No.31670344)the Fundamental Research Funds for the Central Universities(2572019DF08)
文摘Iris sangumea Dorm ex Horn. is a perennial cold-tolerant herbs of the Iris genus of Iridaceae, which has a well-formed, bright color and adaptability. Through understanding the fl ower bud differentiation, Sporogenesis, gametogenesis, fertilization and embryogenesis of I. sangumea, we developed fl owering regulation and control breeding. I. sangumea fl ower bud differentiation was observed in April for 21 days; in this stage, the early differentiation process was slow, temperature was more than 5 °C, if the temperature is shorter than this, most fl ower bud will have no differentiation, and turn to vegetative growth; later differentiation is faster and required temperature is from 5 to 8 °C and gradually rose to 10-12 °C. The temperature in April plays the defi nitely role in the number of bud differentiation. Three stamina contain tetrasporangiate anthers and a glandular tapetum. The anther wall is composed of four cell layers inclduding the epidermis, the endothecium, one middle layer and the secretory tapetum. The type of anther wall development the dicotyledonous type. After pollen maturation, the anther wall forms a double-layer containing only epidermis and endothecium. Simultaneous cytokinesis is of the continuous type during meiosis of microspore mother cell results in a zygomorphous or tetragonal tetrad. Mature pollen grains are two-celled. I. sangumea ’s stylar canal is hollow, open type style, and the gynoecium has three carpels. The ovaries have axial placentas. The ovule is anatropous, bitegmic and crassinucellate. The primary sporogenous cell differentiates directly as the megaspore. The megaspore tetrads are linear, T-shaped or juxtaposed. Generally, the fi rst of the tetrad megaspores at the chalaza becomes functional while the other three degenerate. A mature embryo sac with seven cells and eight nuclei embryo sac is of the polygonum type. For dichogamy, the male gametophyte matures about 2 days earlier than the female gametophyte. The pollen tube entered into the embryo sac for 22–24 h after pollination. The dormancy stage of fertilized ovules is 5-6 days, and the fusion of sperm and egg nucleus is of the premitotic type. The primary endosperm cell has shorter dormancy of 4-6 days, and endosperm formation is of the nuclear type.
文摘Biometric verification has become essential to authenticate the individuals in public and private places.Among several biometrics,iris has peculiar features and its working mechanism is complex in nature.The recent developments in Machine Learning and Deep Learning approaches enable the development of effective iris recognition models.With this motivation,the current study introduces a novel Chaotic Krill Herd with Deep Transfer Learning Based Biometric Iris Recognition System(CKHDTL-BIRS).The presented CKHDTL-BIRS model intends to recognize and classify iris images as a part of biometric verification.To achieve this,CKHDTL-BIRS model initially performs Median Filtering(MF)-based preprocessing and segmentation for iris localization.In addition,MobileNetmodel is also utilized to generate a set of useful feature vectors.Moreover,Stacked Sparse Autoencoder(SSAE)approach is applied for classification.At last,CKH algorithm is exploited for optimization of the parameters involved in SSAE technique.The proposed CKHDTL-BIRS model was experimentally validated using benchmark dataset and the outcomes were examined under several aspects.The comparison study results established the enhanced performance of CKHDTL-BIRS technique over recent approaches.
文摘Due to complex computation and poor real-time performance of the traditional iris recognition system,iris feature is extracted by using amplitude and phase information of the mean image blocks based on Gabor filtering on image,and the k-nearest neighbor algorithm is combined to complete iris recognition function.The recognition reduces the recognition time and improves the recognition accuracy.At the same time,identification result is transmitted to the cloud server through ZigBee network to solve diffcult wiring problem.The experiment shows the system runs stably and has fast recognition speed.It has been applied to a security system.
文摘With the rapid spread of the coronavirus epidemic all over the world,educational and other institutions are heading towards digitization.In the era of digitization,identifying educational e-platform users using ear and iris based multi-modal biometric systems constitutes an urgent and interesting research topic to pre-serve enterprise security,particularly with wearing a face mask as a precaution against the new coronavirus epidemic.This study proposes a multimodal system based on ear and iris biometrics at the feature fusion level to identify students in electronic examinations(E-exams)during the COVID-19 pandemic.The proposed system comprises four steps.Thefirst step is image preprocessing,which includes enhancing,segmenting,and extracting the regions of interest.The second step is feature extraction,where the Haralick texture and shape methods are used to extract the features of ear images,whereas Tamura texture and color histogram methods are used to extract the features of iris images.The third step is feature fusion,where the extracted features of the ear and iris images are combined into one sequential fused vector.The fourth step is the matching,which is executed using the City Block Dis-tance(CTB)for student identification.Thefindings of the study indicate that the system’s recognition accuracy is 97%,with a 2%False Acceptance Rate(FAR),a 4%False Rejection Rate(FRR),a 94%Correct Recognition Rate(CRR),and a 96%Genuine Acceptance Rate(GAR).In addition,the proposed recognition sys-tem achieved higher accuracy than other related systems.
