BACKGROUND Postpartum depression(PPD)represents a significant public health concern,adversely affecting both new mothers and their infants.Despite routine early screening,PPD can persist beyond the initial postpartum ...BACKGROUND Postpartum depression(PPD)represents a significant public health concern,adversely affecting both new mothers and their infants.Despite routine early screening,PPD can persist beyond the initial postpartum months,with notably high incidence rates even one year after childbirth.Persistent PPD has been associated with poor developmental outcomes in infants,highlighting the need for continued monitoring and support during this critical period.Understanding the broader impacts of persistent PPD is essential for developing effective interventions to improve maternal and infant well-being.AIM To explore the impact of persistent PPD on infant developmental behavior and maternal self-efficacy.METHODS We recruited 60 postpartum women who experienced persistent depression after childbirth in our hospital from January 2020 to December 2024 as the research subjects.The study collected basic characteristics of both infants and mothers,analyzed the self-efficacy of the mothers and the developmental behaviors of the infants,and conducted a correlation analysis to examine the relationship between postpartum persistent depression in mothers and the developmental behaviors and self-efficacy of infants.The Bootstrap method was used to verify the significance of the mediating effect.RESULTS The basic characteristics of infants and mothers show that 53.33%are male,58.33%are born via vaginal delivery,88.33%have a normal body mass index,51.67%are aged between 25 and 29 years,70%are non-agricultural workers,51.67%have a per capita household income over 4000 yuan,96.67%are full-term births,and 58.33%of the fathers are aged between 26 and 32 years.In terms of infant development behavior,the gross motor skills score is relatively low(38.44±12.15).Regarding maternal self-efficacy,the skill score(45.68±5.49)and mental activity score(46.37±3.72)are both at a low level.Correlation analysis reveals that postpartum persistent depression is significantly negatively correlated with maternal self-efficacy and infant development behavior(β=-0.439,-0.657,P<0.001),while self-efficacy is positively correlated with infant development behavior(β=0.728,P<0.001).The path coefficient and Bootstrap method test indicate that self-efficacy acts as a mediator between postpartum persistent depression and infant development behavior,accounting for 54.80%of the effect(P<0.05),while the direct effect of postpartum persistent depression on infant development behavior is 45.20%(P<0.05).CONCLUSION Persistent PPD significantly negatively impacts infant developmental outcomes,with maternal self-efficacy serving as a partial mediator.These findings suggest that interventions targeting both depressive symptoms and selfenhancement may effectively promote infant health development.展开更多
Plant height （PH） is one of the most important agronomic traits of rice, as it directly affects the lodging resistance and the high yield potential. Meanwhile, PH is often constrained by water supply over the entire...Plant height （PH） is one of the most important agronomic traits of rice, as it directly affects the lodging resistance and the high yield potential. Meanwhile, PH is often constrained by water supply over the entire growth period. In this study, a recombinant inbred line （RIL） derived from Xiaobaijingzi and Kongyu 131 strains grown under drought stress and with normal irrigation over 2 yr （2013 and 2014）, respectively （regarded as four environments）, was used to dissect the genetic basis of PH by developmental dynamics QTL analysis combined with QTL^environment interactions. QTLs with net effects excluding the accumulated effects were detected to explore the relationship between genexgene interactions and genexenvironment interactions in specific growth period. A total of 26 additive QTLs （A-QTLs） and 37 epistatic QTLs （E-QTLs） associated with PH were detected by unconditional and conditional mapping over seven growth periods, qPH-2-3, qPH-4-3, qPH-6-1, qPH-7-1, and qPH-12-5 could be detected by both unconditional and conditional analyses, qPH-4-3 and qPH-7-5 were detected in four stages （periods） to be sequentially expressed QTLs controlling PH continuous variation. QTLs with additive effects （A-QTLs） were mostly expressed in the period $3iS2 （the time interval from stages 2 to 3）, and QTLxenvironment interactions performed actively in the first three stages （periods） which could be an important developmental period for rice to undergo external morphogenesis during drought stress. Several QTLs showed high adaptability for drought stress and many QTLs were closely related to the environments such as qPH-3-5, qPH-2-2 and qPH-6-1. 72.5% of the QTLs with a and aa effects detected by conditional analysis were under drought stress, and the PVE of QTLs detected by conditional analysis under drought stress were also much higher than that under normal irrigation. We infer that environments would influence the detection results and sequential expression of genes was highly influenced by environments as well. Many QTLs （qPH-1-2, qPH-3-5, qPH-4-1, qPH-2-3） coincident with previously identified drought resistance genes. The result of this study is helpful to elucidating the genetic mechanism and regulatory network underlying the development of PH in rice and providing references to marker assisted selection.展开更多
Objective This study aimed to explore the clinical value of Children Neuropsychological and Behavioral Scale-Revision 2016(CNBS-R2016)for Autism Spectrum Disorder(ASD)screening in the presence of developmental surveil...Objective This study aimed to explore the clinical value of Children Neuropsychological and Behavioral Scale-Revision 2016(CNBS-R2016)for Autism Spectrum Disorder(ASD)screening in the presence of developmental surveillance.Methods All participants were evaluated by the CNBS-R2016 and Gesell Developmental Schedules(GDS).Spearman’s correlation coefficients and Kappa values were obtained.Taking GDS as a reference assessment,the performance of the CNBS-R2016 for detecting the developmental delays of children with ASD was analyzed with receiver operating characteristic(ROC)curves.The efficacy of the CNBS-R2016 to screen for ASD was explored by comparing Communication Warning Behavior with Autism Diagnostic Observation Schedule,Second Edition(ADOS-2).Results In total,150 children aged 12–42 months with ASD were enrolled.The developmental quotients of the CNBS-R2016 were correlated with those of the GDS(r=0.62–0.94).The CNBS-R2016 and GDS had good diagnostic agreement for developmental delays(Kappa=0.73–0.89),except for Fine Motor.There was a significant difference between the proportions of Fine Motor,delays detected by the CNBS-R2016 and GDS(86.0%vs.77.3%).With GDS as a standard,the areas under the ROC curves of the CNBS-R2016 were above 0.95 for all the domains except Fine Motor,which was 0.70.In addition,the positive rate of ASD was 100.0%and 93.5%when the cut-off points of 7 and 12 in the Communication Warning Behavior subscale were used,respectively.Conclusion The CNBS-R2016 performed well in developmental assessment and screening for children with ASD,especially by Communication Warning Behaviors subscale.Therefore,the CNBS-R2016 is worthy of clinical application in children with ASD in China.展开更多
Chemical communication plays an important role in survival and reproductive success in mammalian species. In the present study, we examined the ontogenetic pattern of behavioral responses of male giant pandas （Ailuro...Chemical communication plays an important role in survival and reproductive success in mammalian species. In the present study, we examined the ontogenetic pattern of behavioral responses of male giant pandas （Ailuropoda melanoleuca ） to urine odors of conspecific individuals. Our data showed that exposure to the urine of adult females induced a significant increase in sniffing and environmental sniffing/licking behaviors, but a decrease in biting behavior, in males. Males of different ages displayed specific behaviors to female urine odors. Adult males spent more time licking than juvenile and sub-adult males. Further, sub-adult and adult males displayed high levels of environmental sniffing/licking, which was absent in the juvenile males. Juvenile males displayed scent rubbing behavior significantly more frequently than sub-adult and adult males, and also spent more time showing biting behavior than sub-adult males. Finally, juvenile and sub-aduh males showed no difference in response to female and male urine odors. Together, these data suggest that chemosensory cues from conspecific urines induce age-specific responses in male giant pandas.展开更多
The post-fledging period, extending from fledging to independence, is a crucial life stage characterized by high mortality due to fledglings' limited mobility and inexperience. During this stage, fledglings gradua...The post-fledging period, extending from fledging to independence, is a crucial life stage characterized by high mortality due to fledglings' limited mobility and inexperience. During this stage, fledglings gradually increase their mobility, leave their parents, disperse from their natal site, and respond to the challenges of new environments. Characterizing these post-fledging movements and space use is essential for understanding juvenile survival strategies and devising targeted conservation measures. The Crested Ibis (Nipponia nippon), an endangered species and a highly protected animals at the national level in China, has seen limited research on its post-fledging movements and space use. From 2015 to 2023, we utilized biologgers, combined with field surveys, to study the movement and space use characteristics of 37 fledglings in Hanzhong City, Shaanxi Province, China, over a two-month post-fledging period. We quantified changes in activity levels (based on overall dynamic body acceleration), independence timing, onset of post-fledging dispersal, habitat selection, and daily activity rhythms after independence. Our results revealed individuals began independent living 26.23 ± 2.34 days post-fledging and onset of dispersal at 25.58 ± 2.33 days, with a range area at the natal of 2.08 ± 0.56 km^(2). The initial 30 days post-fledging are characterized as an ontogenetic phase marked by a rapid increase in body activity level. Fledglings preferred paddy fields during the independent period rather than the forests they relied on before independence. Interestingly, the daily activity rhythm, particularly foraging behavior, peaked at noon—contrasting with the expected morning and evening activity peaks—likely as an adaptation to avoid periods of peak human activity. Additionally, drowning, collisions, and predation in paddy fields are noteworthy causes of fledgling mortality. Consequently, we recommend protecting a 2-km^(2) area around the nest site for at least two-month post-fledging, implementing safety measures around power lines and cesspools. Additionally, reducing human disturbances near foraging habitats and expanding space within paddy fields would help mitigate survival pressures on fledglings.展开更多
Phase separation was studied by the optical microscopy in blends of nylon 6 (PA6) with sodium salt of ethylene/methacrylic acid copolymer (PEMA).The image collecting technology was used to keep track of the developme...Phase separation was studied by the optical microscopy in blends of nylon 6 (PA6) with sodium salt of ethylene/methacrylic acid copolymer (PEMA).The image collecting technology was used to keep track of the development of blends at a certain temperature.The fractal dimension of phase separation was calculated by the image solving technology according to the fractal theory and the self similarity behavior of the process was proved.The relationship of the fractal behavior with composition and experimental temperature was discussed.The fractal behavior of the crystallization development of the crystal phase of PA6 in blends was also discussed and the fractal behavior calculated.展开更多
Behavioral division is essential for the sustainability and reproduction of honeybee populations.While accumulating evidence has documented that antibiotic exposure interferes with bee behavioral divisions,how the gut...Behavioral division is essential for the sustainability and reproduction of honeybee populations.While accumulating evidence has documented that antibiotic exposure interferes with bee behavioral divisions,how the gut microbiome,host physiology,and genetic regulation are implicated in this process remains understudied.Here,by constructing single-cohort colonies,we validated that the gut microbiota varied in composition between age-matched nurse and forager bees.Perturbing the gut microbiota with a low dose of antibiotic retained the gut bacterial size,but the structure of the microbial community continuously diverged from the control group after antibiotic treatment.Fewer foragers were observed in the antibiotic groups in the field experiment.A combinatorial effect of decreased gut metabolic gene repertoires,reduced brain neurotransmitter titers,and downregulated brain immune genes could potentially be related to behavioral tasks transition delay.This work indicates that the disturbance to both the gut microbiome and host physiologies after antibiotic exposure may have implications on social behavior development,highlighting the need for further research focusing on antibiotic pollution threatening the honeybee population's health.展开更多
A comprehensive overview is presented of the literature dealing with the development of sleep-like motility and neuronal activity patterns in non-vertebrate animals. It has been established that spontaneous, periodica...A comprehensive overview is presented of the literature dealing with the development of sleep-like motility and neuronal activity patterns in non-vertebrate animals. It has been established that spontaneous, periodically modulated, neurogenic bursts of movement appear to be a universal feature of prenatal behavior. New empirical data are presented showing that such ＇seismic sleep＇ or ＇rapid-body-movement＇ bursts in cuttlefish persist for some time after birth. Extensive ontogenetic research in both vertebrates and non-vertebrates is thus essential before current hypotheses about the phylogeny of motorically active sleep-like states can be taken seriously.展开更多
Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of bioph...Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of biophysical conditions and differences in farmers'management behavior.The main purpose of this paper is to develop a composite index of cropland physical disturbance intensity(CLDI)to reflect the plot-scale discrepancy of potential soil erosion in mountainous areas.The study was based on both plot survey and household interview data,collected from six typical catchments in mountainous areas of southwestern China.Four kinds of physical disturbance practices and two kinds of conservation practices during one crop rotation period were synthesized to develop the CLDI index.The rough set theory was referenced to avoid subjectivity during weight allocation.The results show that conventional tillage,deep fertilization,and manual weeding are the main causes of cropland soil erosion,whereas manure application in combination with seasonal fallow reduces soil erosion.Different crop types as well as cropland location factors determine the spatial pattern of CLDI.Crop rotation modes with major crops of tobacco and maize resulted in a maximal CLDI,and cropland plots with a distance radius of 150 meters away from households received the most intensive physical disturbance.These results are critical to help better protect rural environments in mountainous areas.Based on the results,methods to reduce cropland soil erosion are suggested.展开更多
Early life social experiences are critical to behavioral and cognitive development,and can have a tremendous influence on developing social phenotypes.Most work has focused on outcomes of experiences at a single stage...Early life social experiences are critical to behavioral and cognitive development,and can have a tremendous influence on developing social phenotypes.Most work has focused on outcomes of experiences at a single stage of development(e.g.perinatal or post-weaning).Few studies have assessed the impact of social experience at multiple developmental stages and across sex.Oxytocin and vasopressin are profoundly important for modulating social behavior and these nonapeptide systems are highly sensitive to developmental social experience,particularly in brain areas important for social behavior.We investigated whether oxytocin receptor(OTR)and vasopressin receptor(V1aR)distributions of prairie voles(Microtus ochrogaster)change as a function of parental composition within the natal nest or social composition after weaning.We raised pups either in the presence or absence of their fathers.At weaning,offspring were housed either individually or with a same-sex sibling.We also examined whether changes in receptor distributions are sexually dimorphic because the impact of the developmental environment on the nonapeptide system could be sex-dependent.We found that differences in nonapeptide receptor expression were region-specific,sex-specific and rearing condition-specific,indicating a high level of complexity in the ways that early life experiences shape the social brain.We found many more differences in V1aR density compared to OTR density,indicating that nonapeptide receptors demonstrate differential levels of neural plasticity and sensitivity to environmental and biological variables.Our data highlight that critical factors including biological sex and multiple experiences across the developmental continuum interact in complex ways to shape the social brain.展开更多
Methoprene, a juvenile hormone （JH） analog, is a widely used insecticide that also accelerates behavioral development in honey bees （Apis mellifera）. JH regulates the transition from nursing to foraging in adult w...Methoprene, a juvenile hormone （JH） analog, is a widely used insecticide that also accelerates behavioral development in honey bees （Apis mellifera）. JH regulates the transition from nursing to foraging in adult worker bees, and treatment with JH or methoprene have both been shown to induce precocious foraging. To determine how methoprene changes honey bee behavior, we compared JH titers ofmethoprene-treated and untreated bees. Behavioral observations confirmed that methoprene treatment significantly increased the number of precocious foragers in 3 out of 4 colonies. In only 1 out of 4 colonies, however, was there a significant difference in JH titers between the methoprene- treated and control bees. Further, in all 4 colonies, there was no significant differences in JH titers between precocious and normal-aged foragers. These results suggest that methoprene did not directly affect the endogenous JH secreted by corpora allata. Because methoprene caused early foraging without changing workers＇ JH titers, we conclude that methoprene most likely acts directly on the JH receptors as a substitute for JH.展开更多
基金Supported by the Key Medical Research Project of Hebei Province in 2020,No.20201360.
文摘BACKGROUND Postpartum depression(PPD)represents a significant public health concern,adversely affecting both new mothers and their infants.Despite routine early screening,PPD can persist beyond the initial postpartum months,with notably high incidence rates even one year after childbirth.Persistent PPD has been associated with poor developmental outcomes in infants,highlighting the need for continued monitoring and support during this critical period.Understanding the broader impacts of persistent PPD is essential for developing effective interventions to improve maternal and infant well-being.AIM To explore the impact of persistent PPD on infant developmental behavior and maternal self-efficacy.METHODS We recruited 60 postpartum women who experienced persistent depression after childbirth in our hospital from January 2020 to December 2024 as the research subjects.The study collected basic characteristics of both infants and mothers,analyzed the self-efficacy of the mothers and the developmental behaviors of the infants,and conducted a correlation analysis to examine the relationship between postpartum persistent depression in mothers and the developmental behaviors and self-efficacy of infants.The Bootstrap method was used to verify the significance of the mediating effect.RESULTS The basic characteristics of infants and mothers show that 53.33%are male,58.33%are born via vaginal delivery,88.33%have a normal body mass index,51.67%are aged between 25 and 29 years,70%are non-agricultural workers,51.67%have a per capita household income over 4000 yuan,96.67%are full-term births,and 58.33%of the fathers are aged between 26 and 32 years.In terms of infant development behavior,the gross motor skills score is relatively low(38.44±12.15).Regarding maternal self-efficacy,the skill score(45.68±5.49)and mental activity score(46.37±3.72)are both at a low level.Correlation analysis reveals that postpartum persistent depression is significantly negatively correlated with maternal self-efficacy and infant development behavior(β=-0.439,-0.657,P<0.001),while self-efficacy is positively correlated with infant development behavior(β=0.728,P<0.001).The path coefficient and Bootstrap method test indicate that self-efficacy acts as a mediator between postpartum persistent depression and infant development behavior,accounting for 54.80%of the effect(P<0.05),while the direct effect of postpartum persistent depression on infant development behavior is 45.20%(P<0.05).CONCLUSION Persistent PPD significantly negatively impacts infant developmental outcomes,with maternal self-efficacy serving as a partial mediator.These findings suggest that interventions targeting both depressive symptoms and selfenhancement may effectively promote infant health development.
基金supported by the National Key Technologies R&D Program of China during the 12th Five-Year Plan period (2013BAD20B04)
文摘Plant height （PH） is one of the most important agronomic traits of rice, as it directly affects the lodging resistance and the high yield potential. Meanwhile, PH is often constrained by water supply over the entire growth period. In this study, a recombinant inbred line （RIL） derived from Xiaobaijingzi and Kongyu 131 strains grown under drought stress and with normal irrigation over 2 yr （2013 and 2014）, respectively （regarded as four environments）, was used to dissect the genetic basis of PH by developmental dynamics QTL analysis combined with QTL^environment interactions. QTLs with net effects excluding the accumulated effects were detected to explore the relationship between genexgene interactions and genexenvironment interactions in specific growth period. A total of 26 additive QTLs （A-QTLs） and 37 epistatic QTLs （E-QTLs） associated with PH were detected by unconditional and conditional mapping over seven growth periods, qPH-2-3, qPH-4-3, qPH-6-1, qPH-7-1, and qPH-12-5 could be detected by both unconditional and conditional analyses, qPH-4-3 and qPH-7-5 were detected in four stages （periods） to be sequentially expressed QTLs controlling PH continuous variation. QTLs with additive effects （A-QTLs） were mostly expressed in the period $3iS2 （the time interval from stages 2 to 3）, and QTLxenvironment interactions performed actively in the first three stages （periods） which could be an important developmental period for rice to undergo external morphogenesis during drought stress. Several QTLs showed high adaptability for drought stress and many QTLs were closely related to the environments such as qPH-3-5, qPH-2-2 and qPH-6-1. 72.5% of the QTLs with a and aa effects detected by conditional analysis were under drought stress, and the PVE of QTLs detected by conditional analysis under drought stress were also much higher than that under normal irrigation. We infer that environments would influence the detection results and sequential expression of genes was highly influenced by environments as well. Many QTLs （qPH-1-2, qPH-3-5, qPH-4-1, qPH-2-3） coincident with previously identified drought resistance genes. The result of this study is helpful to elucidating the genetic mechanism and regulatory network underlying the development of PH in rice and providing references to marker assisted selection.
基金This study was supported by Emergency Technology Research Project of Huazhong University of Science and Technology(No.2020kfyXGYJ020).
文摘Objective This study aimed to explore the clinical value of Children Neuropsychological and Behavioral Scale-Revision 2016(CNBS-R2016)for Autism Spectrum Disorder(ASD)screening in the presence of developmental surveillance.Methods All participants were evaluated by the CNBS-R2016 and Gesell Developmental Schedules(GDS).Spearman’s correlation coefficients and Kappa values were obtained.Taking GDS as a reference assessment,the performance of the CNBS-R2016 for detecting the developmental delays of children with ASD was analyzed with receiver operating characteristic(ROC)curves.The efficacy of the CNBS-R2016 to screen for ASD was explored by comparing Communication Warning Behavior with Autism Diagnostic Observation Schedule,Second Edition(ADOS-2).Results In total,150 children aged 12–42 months with ASD were enrolled.The developmental quotients of the CNBS-R2016 were correlated with those of the GDS(r=0.62–0.94).The CNBS-R2016 and GDS had good diagnostic agreement for developmental delays(Kappa=0.73–0.89),except for Fine Motor.There was a significant difference between the proportions of Fine Motor,delays detected by the CNBS-R2016 and GDS(86.0%vs.77.3%).With GDS as a standard,the areas under the ROC curves of the CNBS-R2016 were above 0.95 for all the domains except Fine Motor,which was 0.70.In addition,the positive rate of ASD was 100.0%and 93.5%when the cut-off points of 7 and 12 in the Communication Warning Behavior subscale were used,respectively.Conclusion The CNBS-R2016 performed well in developmental assessment and screening for children with ASD,especially by Communication Warning Behaviors subscale.Therefore,the CNBS-R2016 is worthy of clinical application in children with ASD in China.
文摘Chemical communication plays an important role in survival and reproductive success in mammalian species. In the present study, we examined the ontogenetic pattern of behavioral responses of male giant pandas （Ailuropoda melanoleuca ） to urine odors of conspecific individuals. Our data showed that exposure to the urine of adult females induced a significant increase in sniffing and environmental sniffing/licking behaviors, but a decrease in biting behavior, in males. Males of different ages displayed specific behaviors to female urine odors. Adult males spent more time licking than juvenile and sub-adult males. Further, sub-adult and adult males displayed high levels of environmental sniffing/licking, which was absent in the juvenile males. Juvenile males displayed scent rubbing behavior significantly more frequently than sub-adult and adult males, and also spent more time showing biting behavior than sub-adult males. Finally, juvenile and sub-aduh males showed no difference in response to female and male urine odors. Together, these data suggest that chemosensory cues from conspecific urines induce age-specific responses in male giant pandas.
基金funded by the National Natural Science Foundation of China(No.32270554,32400400).
文摘The post-fledging period, extending from fledging to independence, is a crucial life stage characterized by high mortality due to fledglings' limited mobility and inexperience. During this stage, fledglings gradually increase their mobility, leave their parents, disperse from their natal site, and respond to the challenges of new environments. Characterizing these post-fledging movements and space use is essential for understanding juvenile survival strategies and devising targeted conservation measures. The Crested Ibis (Nipponia nippon), an endangered species and a highly protected animals at the national level in China, has seen limited research on its post-fledging movements and space use. From 2015 to 2023, we utilized biologgers, combined with field surveys, to study the movement and space use characteristics of 37 fledglings in Hanzhong City, Shaanxi Province, China, over a two-month post-fledging period. We quantified changes in activity levels (based on overall dynamic body acceleration), independence timing, onset of post-fledging dispersal, habitat selection, and daily activity rhythms after independence. Our results revealed individuals began independent living 26.23 ± 2.34 days post-fledging and onset of dispersal at 25.58 ± 2.33 days, with a range area at the natal of 2.08 ± 0.56 km^(2). The initial 30 days post-fledging are characterized as an ontogenetic phase marked by a rapid increase in body activity level. Fledglings preferred paddy fields during the independent period rather than the forests they relied on before independence. Interestingly, the daily activity rhythm, particularly foraging behavior, peaked at noon—contrasting with the expected morning and evening activity peaks—likely as an adaptation to avoid periods of peak human activity. Additionally, drowning, collisions, and predation in paddy fields are noteworthy causes of fledgling mortality. Consequently, we recommend protecting a 2-km^(2) area around the nest site for at least two-month post-fledging, implementing safety measures around power lines and cesspools. Additionally, reducing human disturbances near foraging habitats and expanding space within paddy fields would help mitigate survival pressures on fledglings.
文摘Phase separation was studied by the optical microscopy in blends of nylon 6 (PA6) with sodium salt of ethylene/methacrylic acid copolymer (PEMA).The image collecting technology was used to keep track of the development of blends at a certain temperature.The fractal dimension of phase separation was calculated by the image solving technology according to the fractal theory and the self similarity behavior of the process was proved.The relationship of the fractal behavior with composition and experimental temperature was discussed.The fractal behavior of the crystallization development of the crystal phase of PA6 in blends was also discussed and the fractal behavior calculated.
基金funded by National Natural Science Foundation of China Projects 32370550 and 32300385the Science Foundation of Hebei Normal University(L2023B21).
文摘Behavioral division is essential for the sustainability and reproduction of honeybee populations.While accumulating evidence has documented that antibiotic exposure interferes with bee behavioral divisions,how the gut microbiome,host physiology,and genetic regulation are implicated in this process remains understudied.Here,by constructing single-cohort colonies,we validated that the gut microbiota varied in composition between age-matched nurse and forager bees.Perturbing the gut microbiota with a low dose of antibiotic retained the gut bacterial size,but the structure of the microbial community continuously diverged from the control group after antibiotic treatment.Fewer foragers were observed in the antibiotic groups in the field experiment.A combinatorial effect of decreased gut metabolic gene repertoires,reduced brain neurotransmitter titers,and downregulated brain immune genes could potentially be related to behavioral tasks transition delay.This work indicates that the disturbance to both the gut microbiome and host physiologies after antibiotic exposure may have implications on social behavior development,highlighting the need for further research focusing on antibiotic pollution threatening the honeybee population's health.
文摘A comprehensive overview is presented of the literature dealing with the development of sleep-like motility and neuronal activity patterns in non-vertebrate animals. It has been established that spontaneous, periodically modulated, neurogenic bursts of movement appear to be a universal feature of prenatal behavior. New empirical data are presented showing that such ＇seismic sleep＇ or ＇rapid-body-movement＇ bursts in cuttlefish persist for some time after birth. Extensive ontogenetic research in both vertebrates and non-vertebrates is thus essential before current hypotheses about the phylogeny of motorically active sleep-like states can be taken seriously.
基金jointly funded by the National Key Basic Research Program of China (973 program) (Grant NO.2015CB452702)the National Natural Science Foundation of China (Grant NO.41371539)partially supported by the CDM Fund Grant Project in China (Grant NO. 2013030)
文摘Various kinds of human disturbances on cropland are the main reasons for soil erosion and land degradation.Farming practices in mountainous areas vary greatly among cropland plots because of the heterogeneity of biophysical conditions and differences in farmers'management behavior.The main purpose of this paper is to develop a composite index of cropland physical disturbance intensity(CLDI)to reflect the plot-scale discrepancy of potential soil erosion in mountainous areas.The study was based on both plot survey and household interview data,collected from six typical catchments in mountainous areas of southwestern China.Four kinds of physical disturbance practices and two kinds of conservation practices during one crop rotation period were synthesized to develop the CLDI index.The rough set theory was referenced to avoid subjectivity during weight allocation.The results show that conventional tillage,deep fertilization,and manual weeding are the main causes of cropland soil erosion,whereas manure application in combination with seasonal fallow reduces soil erosion.Different crop types as well as cropland location factors determine the spatial pattern of CLDI.Crop rotation modes with major crops of tobacco and maize resulted in a maximal CLDI,and cropland plots with a distance radius of 150 meters away from households received the most intensive physical disturbance.These results are critical to help better protect rural environments in mountainous areas.Based on the results,methods to reduce cropland soil erosion are suggested.
基金The authors acknowledge the support from the National Institutes of Health(Eunice Kennedy Shriver National Institute of Child Health and Human Development HD079573 to A.G.O.)the National Science Foundation Graduate Research Fellowship Program(under DGE-1650441 to L.C.H.).
文摘Early life social experiences are critical to behavioral and cognitive development,and can have a tremendous influence on developing social phenotypes.Most work has focused on outcomes of experiences at a single stage of development(e.g.perinatal or post-weaning).Few studies have assessed the impact of social experience at multiple developmental stages and across sex.Oxytocin and vasopressin are profoundly important for modulating social behavior and these nonapeptide systems are highly sensitive to developmental social experience,particularly in brain areas important for social behavior.We investigated whether oxytocin receptor(OTR)and vasopressin receptor(V1aR)distributions of prairie voles(Microtus ochrogaster)change as a function of parental composition within the natal nest or social composition after weaning.We raised pups either in the presence or absence of their fathers.At weaning,offspring were housed either individually or with a same-sex sibling.We also examined whether changes in receptor distributions are sexually dimorphic because the impact of the developmental environment on the nonapeptide system could be sex-dependent.We found that differences in nonapeptide receptor expression were region-specific,sex-specific and rearing condition-specific,indicating a high level of complexity in the ways that early life experiences shape the social brain.We found many more differences in V1aR density compared to OTR density,indicating that nonapeptide receptors demonstrate differential levels of neural plasticity and sensitivity to environmental and biological variables.Our data highlight that critical factors including biological sex and multiple experiences across the developmental continuum interact in complex ways to shape the social brain.
文摘Methoprene, a juvenile hormone （JH） analog, is a widely used insecticide that also accelerates behavioral development in honey bees （Apis mellifera）. JH regulates the transition from nursing to foraging in adult worker bees, and treatment with JH or methoprene have both been shown to induce precocious foraging. To determine how methoprene changes honey bee behavior, we compared JH titers ofmethoprene-treated and untreated bees. Behavioral observations confirmed that methoprene treatment significantly increased the number of precocious foragers in 3 out of 4 colonies. In only 1 out of 4 colonies, however, was there a significant difference in JH titers between the methoprene- treated and control bees. Further, in all 4 colonies, there was no significant differences in JH titers between precocious and normal-aged foragers. These results suggest that methoprene did not directly affect the endogenous JH secreted by corpora allata. Because methoprene caused early foraging without changing workers＇ JH titers, we conclude that methoprene most likely acts directly on the JH receptors as a substitute for JH.
