期刊文献+
共找到1,266篇文章
< 1 2 64 >
每页显示 20 50 100
High-yielding Cultivation and Fertilization Technology of Lvhan No.1 in Angola
1
作者 杨前进 邱康键 +2 位作者 张显春 刘广辉 王斌 《Agricultural Science & Technology》 CAS 2012年第11期2296-2298,2346,共4页
[Objective] The aim was to research high-yielding cultivation and fertilization technology for Lvhan No.l, a new Chinese rice cultivar, in Angola. [Method] In rainy season of 2012, high-yielding cultivation and fertil... [Objective] The aim was to research high-yielding cultivation and fertilization technology for Lvhan No.l, a new Chinese rice cultivar, in Angola. [Method] In rainy season of 2012, high-yielding cultivation and fertilization technology of Lvhan No.l, a new cultivar of earlier ripe and drought resistant rice, was researched in CATETE farm of Luanda suburb with pot experiment method. [Result] In CATETE farm, Lvhan No.1 rice were directly sown in black clay and the rice can be significantly improved in plant height, grain weight of single plant, biological yield of single plant, ear length, total grain number per ear, number of filled grain per ear and thousand seed weight, as well as economic coefficient and ratio of grain to straw, if applied with base fertilizer made up of DAP (N:P2Os=14:43), or compound fertilizer of N, P and K (N:P2Os:K^O=15:15:15) and with Duannai fertilizer and ear-grain fertilizer made up of urea. If DAP is taken as base fertilizer, the optimal quantity is 300 kg/hm2. If compound fertilizer of N, P and K is taken as base fertilizer, the optimal quantity is 450 kg/hm2, but urea at 75 kg/hm2 should be applied as Duannai fertilizer and ear- grain fertilizer, respectively, on time. [Conclusion] The research provides technical ref- erences for planting of Chinese rice cultivars in Angola. 展开更多
关键词 Lvhan No.l ANGOLA fertilization technology
下载PDF
One-time fertilization at first flowering improves lint yield and dry matter partitioning in late planted short-season cotton 被引量:7
2
作者 LUO Hong-hai WANG Qiang +3 位作者 ZHANG Jie-kun WANG Lei-shan LI Ya-bing YANG Guo-zheng 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2020年第2期509-517,共9页
Cotton producers have substantially reduced their inputs(labor,nutrients,and management)mainly by adopting a shortseason cropping management that is characterized by late sowing,high density,and reduced fertilization ... Cotton producers have substantially reduced their inputs(labor,nutrients,and management)mainly by adopting a shortseason cropping management that is characterized by late sowing,high density,and reduced fertilization with one-time application at the first bloom stage without lint yield reduction.However,it has been hypothesized that one-time fertilization at an earlier growth stage could be a more effective and economic management practice.A two-year field experiment was conducted by applying five fertilizer one-time fertilization at 0(FT1),5(FT2),10(FT3),15(FT4),and 20(FT5)days after the first flower appeared in the field and one three-split fertilizer application taken as the conventional control(FT6),making six treatments altogether.Cotton growth period,biomass accumulation,yield,and its formation were quantified.The results showed that the one-time fertilization did not affect the cotton growth progress as compared to FT6,however,the total crop cycles for FT3–FT5 were 3 days shorter.FT1 produced the highest cotton lint yield(1396 kg ha–1),which was similar to the FT6 but higher than the other treatments,and could be attributed to more bolls per unit area and higher lint percentage.Cotton yield was positively correlated with cotton plant biomass accumulated.FT1 had both the highest average(VT)(193.7 kg ha–1 d–1)and the highest maximum(VM)(220.9 kg ha–1 d–1)rates during the fast biomass accumulation period.These results suggest that one-time fertilizer application at the first flower stage might be an adjustment that is more effective than at first bloom,and allowed for easier decision making for application date due to non counting of plants with flowers is needed. 展开更多
关键词 one-time fertilization first flower cotton biomass accumulation yield
下载PDF
Clinical study of different fertilization methods of assisted reproductive technology on neonatal birth defects
3
作者 Bao-Guo Xie Yan-Lin Ma Yuan-Hua Huang 《Journal of Hainan Medical University》 2021年第22期23-26,共4页
Objective:To investigate the incidence of neonatal birth defects in assisted reproductive technology(ART)by in vitro fertilization(IVF)and intracytoplasmic sperm injection(ICSI).Methods:The clinical data of 4229 cases... Objective:To investigate the incidence of neonatal birth defects in assisted reproductive technology(ART)by in vitro fertilization(IVF)and intracytoplasmic sperm injection(ICSI).Methods:The clinical data of 4229 cases of singleton deliver by infertile patients under 35 years old who received IVF/ICSI-ET in our center were analyzed.According to different fertilization methods,they were divided into IVF group(2967 cases)and ICSI group(1262 cases).The general situation of birth,birth defects and the location of defects were compared between the two groups.Results:a total of 38 cases of neonatal birth defects were found,the incidence of birth defects was 0.89%,including 30 cases(1.01%)in IVF group and 8 cases(0.64%)in ICSI group.There was no significant difference in the incidence of birth defects between the two groups(P>0.05).There was also no significant difference in birth weight,gestational age and gender ratio between the two groups(P>0.05).Conclusion:Different fertilization methods in assisted reproductive technology do not increase the incidence of neonatal birth defects. 展开更多
关键词 Assisted reproductive technology Birth defects In vitro fertilization Intracytoplasmic sperm injection
下载PDF
Present Situation, Existing Problems and Recommendations for Orchard Fertilization Technology
4
作者 Shuwei WEI Shaomin WANG +5 位作者 Yao TONG Xiaochang DONG Ran DONG Hongwei WANG Kun RAN Yong ZHANG 《Asian Agricultural Research》 2019年第12期75-77,81,共4页
This paper summarizes the development process and research status of orchard fertilization technology,introduces many kinds of fertilization methods,such as soil testing and fertilizer recommendation method,and nutrit... This paper summarizes the development process and research status of orchard fertilization technology,introduces many kinds of fertilization methods,such as soil testing and fertilizer recommendation method,and nutrition diagnosis method,probes into the main problems existing in orchard fertilization,and puts forward some suggestions for solving them. The development of orchard fertilization technology in China is also projected. 展开更多
关键词 ORCHARD fertilization technology RECOMMENDATIONS
下载PDF
Application of waterborne acrylic emulsions in coated controlled release fertilizer using reacted layer technology 被引量:4
5
作者 申亚珍 赵聪 +1 位作者 周健民 杜昌文 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期309-314,共6页
Waterborne acrylic emulsions modified with organic siloxanes and aziridine crosslinker were synthesized and applied as coating of controlled release fertilizer. The free films were characterized and the nutrient relea... Waterborne acrylic emulsions modified with organic siloxanes and aziridine crosslinker were synthesized and applied as coating of controlled release fertilizer. The free films were characterized and the nutrient release profiles of the coated fertilizers were determined. The results show that methyl silicone oil and methylsilanolate sodium could not improve water resistance performance and glass transition temperature Tgof coatings, while the firmness is enhanced. Aziridine crosslinker improves the water resistance performance, firmness and Tg. Incorporation of methyl silicone oil and aziridine crosslinker gives an excellent aqueous acrylic emulsion for coated controlled release fertilizer, with the 30-day cumulative nutrient release reduced to 16% and an estimated nutrient release duration over 190 days. Therefore, this waterborne coating is promising to meet the requirements for controlled release of nutrient and environmental protection. 展开更多
关键词 Controlled release fertilizer Acrylic emulsion SILOXANE CROSSLINKER Reacted layer technology
下载PDF
Microfluidic thermotaxic selection of highlymotile sperm and in vitro fertilization
6
作者 Sihan Chen Jiemin Chen +8 位作者 Zihan Qin Jibo Wang Yuwen Wang Rong Liu Wen Zhao Ming Zhang Yuanzhen Zhang Mengcheng Luo Pu Chen 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2024年第5期687-700,共14页
The selection of the most motile and functionally competent sperm is an essential basis for in vitro fertilization(IVF)and normal embryonic development.Widely adopted clinical approaches for sperm sample processing in... The selection of the most motile and functionally competent sperm is an essential basis for in vitro fertilization(IVF)and normal embryonic development.Widely adopted clinical approaches for sperm sample processing intensely rely on centrifugation and wash steps that may induce mechanical damage and oxidative stress to sperm.Although a few microfluidic sperm sorting devices may avoid these adverse effects by exploiting intrinsic guidance mechanisms of sperm swimming,none of these approaches have been fully validated by clinical-grade assessment criteria.In this study,a microfluidic sperm sorting device that enables the selection of highly motile and functional sperm via their intrinsic thermotaxis is presented.Bioinspired by the temperature microenvironment in the fallopian tube during natural sperm selection,a microfluidic device with controllable temperature gradients along the sperm separation channel was designed and fabricated.This study investigated the optimal temperature conditions for human sperm selection and fully characterized thermotaxis-selected sperm with 45 human sperm samples.Results indicated that a temperature range of 35–36.5℃along the separation channel significantly improves human sperm motility rate((85.25±6.28)%vs.(60.72±1.37)%;P=0.0484),increases normal sperm morphology rate((16.42±1.43)%vs.(12.55±0.88)%;P<0.0001),and reduces DNA fragmentation((7.44±0.79)%vs.(10.36±0.72)%;P=0.0485)compared to the nonthermotaxis group.Sperm thermotaxis is species-specific,and selected mouse sperm displayed the highest motility in response to a temperature range of 36–37.5℃ along the separation channel.Furthermore,IVF experiments indicated that the selected sperm permitted an increased fertilization rate and improved embryonic development from zygote to blastocyst.This microfluidic thermotaxic selection approach will be translated into clinical practice to improve the IVF success rate for patients with oligozoospermia and asthenozoospermia. 展开更多
关键词 Microfluidic device THERMOTAXIS Sperm sorting Assisted reproductive technology In vitro fertilization
下载PDF
Application Effect of Integrated Water and Fertilizer Technology for Tomato 被引量:2
7
作者 Haimin KONG Ruohui LU 《Asian Agricultural Research》 2017年第11期62-65,共4页
Integrated water and fertilizer technology has the advantages of saving water,fertilizer and labour,which is widely applied in tomato plantation. Integrated water and fertilizer technology in topdressing and whole pro... Integrated water and fertilizer technology has the advantages of saving water,fertilizer and labour,which is widely applied in tomato plantation. Integrated water and fertilizer technology in topdressing and whole process of big and small tomatoes were studied,and their application effects were contrasted and analyzed,and application advantages and scopes of the two models were concluded. 展开更多
关键词 TOMATO Integrated water and fertilizer technology in whole process Integrated water and fertilizer technology in topdressing
下载PDF
One-time Shaping Technological System of Lightweight Roof Greening 被引量:1
8
作者 殷金岩 许建新 +5 位作者 罗旭荣 骆华容 黎修东 唐巧玲 王玲玲 何新杰 《Agricultural Science & Technology》 CAS 2016年第6期1471-1474,共4页
Lightweight roof greening is an important way for improving urban ecological environment and has good ecological and social benefits, but the investment is- too-high for the investors. Therefore, it is necessary to im... Lightweight roof greening is an important way for improving urban ecological environment and has good ecological and social benefits, but the investment is- too-high for the investors. Therefore, it is necessary to improve the system of lightweight roof greening. This study introduced a lightweight roof greening mode with low cost, simple construction, rapid formation, good economic benefit and convenient curing. 展开更多
关键词 Lightweight roof greening one-time shaping technology Plant mat
下载PDF
Effects of Integrated Technology of Medicine and Fertilizer on Bacterial Wilt of Tobacco 被引量:1
9
作者 ZHOU Lian-chuan HE Wen-wei +5 位作者 QIN Xi-yun XU Tian-yang ZHANG Chuan-shu WANG Jing LU Fu-zhi ZHANG Li-xia 《Agricultural Science & Technology》 CAS 2019年第3期47-50,共4页
In order to validate the control effects of integrated technology of medicine and fertilizer on tobacco bacterial wilt,field experiments were conducted by using youmeili and tetracycline as the test agents.The results... In order to validate the control effects of integrated technology of medicine and fertilizer on tobacco bacterial wilt,field experiments were conducted by using youmeili and tetracycline as the test agents.The results obtained were listed as follows:(1)The incidence rate of bacterial wilt ascended more quickly after July 10 th,the incidence of CK reached 78.30%on July 25 th.(2)The control effect of“youmeili 3 g+tetramycin 200 times liquid”reached 69.47%,significantly higher than other treatments.(3)The output value of“Youmeil 3 g+tetramycin 200 times liquid”served as 1635.66 yuan/667m^2,with the highest economic character in all treatments.In a word,integrated technology of medicine and fertilizer was a feasible approach to control tobacco bacterial wilt. 展开更多
关键词 Bacterial wilt Control effect Youmeil+tetramycin Integrated technology of medicine and fertilizer
下载PDF
Treatment of gasification effluent of fertilizer with biochemical united technology
10
作者 TIAN Ai-min JIANG Feng +3 位作者 DONG Ning TIAN Ai-jie CHENG Jian-guang JIANG An-xi 《Journal of Coal Science & Engineering(China)》 2010年第3期320-322,共3页
Introduced the technology and application of treating the gasification effluent offertilizer with the physical-chemistry and biochemistry united technology.The technology issimple and viable, and occupies less land.Wh... Introduced the technology and application of treating the gasification effluent offertilizer with the physical-chemistry and biochemistry united technology.The technology issimple and viable, and occupies less land.When the main equipment runs normally, thegasification effluent of fertilizer treated with the united technology reached the requirementby second-degree discharge standard of the'Discharge standard of water pollutants forsynthesize ammonia industry'. 展开更多
关键词 gasification effluent of fertilizer the united technology treatment of effluent
下载PDF
Evaluation of Variable Rate Technology for Fertilizer Application in Permanent Pastures
11
作者 J. M. Serrano J. M. Peca Shahidian 《Journal of Agricultural Science and Technology(A)》 2011年第4X期489-499,共11页
This paper describes the field tests carried out to evaluate the new Vicon RS-EDW centrifugal fertilizer spreader, to be used in Precision Agriculture. The results of initial dynamic calibration tests showed a signifi... This paper describes the field tests carried out to evaluate the new Vicon RS-EDW centrifugal fertilizer spreader, to be used in Precision Agriculture. The results of initial dynamic calibration tests showed a significant and systematic difference between the application rates of the two discs (about 20%). This difference had to be corrected by the manufacturer that carried out the necessary changes to the electric actuators. The fertilizer spreader had good distribution homogeneity, considering different working velocities and different positions in the parcel. The pattern distribution curve for 18% super phosphate fertilizer led to an effective working width of 28 meters, with a coefficient of variation of 15%. The longitudinal test, under experimental working conditions led to a machine delay time of 6-7 seconds. The results show an actual fertilization application density between 74%-90% of that determined for each location. These results confirm that the spreader can be used to spread fertilizer differentially in the field. 展开更多
关键词 Calibration centrifugal fertilizer spreader evaluation precision agriculture variable rate technology.
下载PDF
Effects of Soil Testing and Formulated Fertilization on Yield and Economic Benefit of Major Crops in Burundi 被引量:1
12
作者 Kaiqiang LIU Yuyi HUANG +2 位作者 Yanfei HUANG Guifen CHEN Guoqing GAO 《Asian Agricultural Research》 2020年第3期52-56,共5页
[Objectives]The purpose of this study was to provide technical support for high-yield cultivation of major crops in Burundi,thereby increasing local farmers'income and promoting sustainable development of agricult... [Objectives]The purpose of this study was to provide technical support for high-yield cultivation of major crops in Burundi,thereby increasing local farmers'income and promoting sustainable development of agriculture in Burundi.[Methods]In the IMBO and MOSO test stations of the Burundi Academy of Agricultural Sciences and the Burundi Fruit and Vegetable Extension and Service Center,soil testing and formulated fertilization test and demonstration was carried out in rice,maize and cabbage.The test set up three treatments,soil testing and formulated fertilization(STFF),local routine fertilization(RF)and non-fertilization(CK)to investigate the effects of soil testing and formulated fertilization on the yield and economic benefit of the crops.[Results]In the plot test,the yield and net economic benefit of rice,maize and cabbage were both highest in the STFF treatment.Compared with those in the RF treatment,the yield of rice,maize and cabbage increased by 19.0%,25.7%and 33.0%,respectively,and the net economic benefit increased by 4292,2837 and 8232 yuan/ha,respectively.In the field test,the yield and net economic benefit of rice,maize and cabbage were also both highest in the STFF treatment.The yield increased by 18.1%,24.3%and 25.9%,respectively,and the net economic benefit increased by 4142,2881 and 8665 yuan/ha,respectively compared with those in the RF treatment.[Conclusions]Soil testing and formulated fertilization not only increased rice,maize and cabbage yield per unit area,but also increased farmers'income in Burundi.It is one of the important technical measures to promote the increase of agricultural production and income in Burundi. 展开更多
关键词 BURUNDI Soil testing and formulated fertilization technology YIELD ECONOMIC BENEFIT
下载PDF
A RCK Model with Endogenous Fertility and Exogenous Technological Change
13
作者 CAI Dong han College of Mathematics and Computer Science, Wuhan University, Wuhan 430072, China 《Wuhan University Journal of Natural Sciences》 CAS 2000年第2期137-142,共6页
The technological change as an exogenous variable is introduced into the RCK model with endogenous fertility in this paper. It is proved that the model has at least a nonzero steady state and the nonzero steady state ... The technological change as an exogenous variable is introduced into the RCK model with endogenous fertility in this paper. It is proved that the model has at least a nonzero steady state and the nonzero steady state is unique when the parameters satisfies some conditions. By phrase protrait analysis, the unique nonzero steady state is saddle and the economy has a unique optimal growth path. The results obtained implies that the relationship between the technological change and population growth rate determinated by the economic structure and the parental ethies. For the economy in which the parents is selfish, promoting the technological change rate decreases the fertility at the steady state. On the other hand, for the economy in which the parents is less selfish, the fertility increases as the technological change rate increases. 展开更多
关键词 C K model fertilITY technological change economic growth
下载PDF
Secondary sex ratio of assisted reproductive technology babies
14
作者 Nathira Abdul Majeed Charley Zheng +3 位作者 Alex Polyakov Megan Pucci Mohamed Hatta Tarmizi Mie Mie Cho Win 《Asian pacific Journal of Reproduction》 2019年第2期88-92,共5页
Objective: To assess the secondary sex ratio (SSR) of assisted reproduction technology babies within a fertility clinic in Melbourne, Australia. Methods: A retrospective cohort study was conducted on 3369 babies who w... Objective: To assess the secondary sex ratio (SSR) of assisted reproduction technology babies within a fertility clinic in Melbourne, Australia. Methods: A retrospective cohort study was conducted on 3369 babies who were born following single embryo transfer between 2011 and 2016. Variables examined included embryo creation date, maternal and paternal ages, maternal body mass index (BMI), type of infertility, sperm parameters, fertilization method, type of embryo and stage of transfer. Multivariate regression analysis was performed on the data set using STRATA V9.2. Results: More males were found to be born to embryos created in summer (adjusted odds ratio=1.46, 95% confidence interval: 1.08-1.95;P=0.01). Lower BMI of mother (≤30 kg/m 2) and younger age of parents (≤35 years) were associated with an increase in SSR (50.1% vs. 47.1%;50.6% vs. 48.8%;50.0% vs. 48.9%) respectively. Decreased SSR value was associated with primary subfertility, using in-vitro fertilization procedure and fresh embryo compared to those with secondary subfertility, using intracytoplasmic sperm injection procedure and thawed embryo (49.3% vs. 50.6%;47.1% vs. 50.8%;49.4% vs. 50.1%) respectively. Conclusions: The fertilization methods, type of embryo, stage of embryo transfer, parameters of the sperm and status of subfertility do not significantly affect the SSR. SSR is affected by the seasonality, maternal age, and BMI. 展开更多
关键词 Artificial REPRODUCTION technology INTRACYTOPLASMIC SPERM injection In-vitro fertilization SECONDARY SEX ratio
下载PDF
The barriers of joining in vitro fertilization programs among infertile couples in developing countries:A scoping review
15
作者 Andriana K Dewi Anggi L Wicaksana +1 位作者 Muhammad Lutfi Agung Dewanto 《Asian pacific Journal of Reproduction》 2023年第4期147-154,I0001-I0003,共11页
Objective:To determine the barriers of joining in-vitro fertilization(IVF)programs among infertile couples in developing countries.Methods:This study assessed infertile couples and the barriers or associated factors r... Objective:To determine the barriers of joining in-vitro fertilization(IVF)programs among infertile couples in developing countries.Methods:This study assessed infertile couples and the barriers or associated factors resulting in delayed decision-making of joining IVF program by searching databases PubMed,ScienceDirect,EBSCO,ClinicalKey,and Cochrane Library from inception until December 31,2021.Additional search strategies were snowballing literature search and citation tracking.Results:Eleven articles were included in the scoping review.The cost was the greatest barrier of joining IVF program.Limited access and lack of assisted reproductive technology centers,few qualified infertility trained staff,insufficient government support,low priority in government policy,along with sociocultural factors,such as religion and false beliefs or myths were also majorly considered to be associated obstacles.Conclusions:The main barrier associated with IVF program among infertile couples in developing countries is the high cost of the IVF services. 展开更多
关键词 In vitro fertilization Assisted reproductive technology BARRIER Developing countries
下载PDF
Study on In-vitro Production Technology of Embryos from Young Dorper Sheep
16
作者 Huidi LUO Yangyi MAO +7 位作者 Huihui GUO Li ZHANG Zhiwu WANG Zhijun WANG Jun LI Hongyu GUO Lina XUE Wenqing DANG 《Agricultural Biotechnology》 CAS 2019年第6期44-47,113,共5页
This study was conducted to investigate the in-vitro production technology of embryos from young Dorper sheep, so as to provide technical support for the utilization of ovarian follicles in young Dorper sheep. Tests w... This study was conducted to investigate the in-vitro production technology of embryos from young Dorper sheep, so as to provide technical support for the utilization of ovarian follicles in young Dorper sheep. Tests were conducted from the induction of Dorper sheep of 4 to 8 weeks old using follicle stimulating hormone(FSH) and pregnant horse serum(PMSG), collection of oocytes, in-vitro oocyte maturation-fertilization-zygote cultivation and 2-4-cell-stage fertilized ovum transfer. The results showed that 585 oocytes were collected from eight Dorper sheep at the age of 4 and 8 weeks, with an average of 73.13 oocytes/sheep. 346 of the 2-4-cell-stage fertilized eggs were obtained, whose cleavage rate was 59.15%. 77 in-vitro fertilized eggs at 2-4-cell stage were transplanted into 17 recipient sheep, seven of which were pregnant and gave birth to 13 "test-tube sheep" with a conception rate of 41.18%. It is indicated that the hormone induction technique, in-vitro oocyte maturation-fertilization-zygote cultivation technique and 2-4-cell-stage fertilized ovum transfer technique used in this study can serve as effective techniques for the in-vitro production of embryos from Dorper sheep of 4-8 weeks old. 展开更多
关键词 Young Dorper sheep In-vitro production technology of embryos In-vitro fertilization 2-4-cell fertilized ovum Test-tube sheep
下载PDF
Awareness and Attitudes Toward In Vitro Fertilization in Patients with Infertility:A Cross-Sectional Study
17
作者 Dong-Li Mei 《Psychosomatic Medicine Research》 2021年第1期24-32,共9页
Objective:To investigate the awareness and attitudes of patients with infertility toward in vitro fertilization(IVF).Methods:A cross-sectional study was conducted in patients with infertility at the Reproductive Medic... Objective:To investigate the awareness and attitudes of patients with infertility toward in vitro fertilization(IVF).Methods:A cross-sectional study was conducted in patients with infertility at the Reproductive Medicine Center of Peking University Third Hospital.Data collection was conducted using a questionnaire that consists of patient background information,methods of obtaining relevant IVF information,and patients’awareness of IVF treatment as well as the law and ethics.Results:A total of 198 participants of different backgrounds were enrolled in the study,and IVF information was obtained through different means;however,most of the participants had a lack of awareness and improper attitude toward IVF.The participants had higher estimations of treatment expenses(Pearson λ^(2)=22.132,P<0.05)and time(Pearson λ^(2)=47.992,P<0.05)during the initial consultation,while those with treatment experience expressed fewer concerns about IVF therapy(Pearson λ^(2)=9.467,P<0.05),particularly about the genetic risks of having IVF.Conclusion:Measures should be taken to improve patients’awareness and attitudes toward IVF,and a large-scale and multicenter clinical study should be conducted in the future. 展开更多
关键词 fertilization in vitro Assisted reproductive technology PSYCHOLOGY Awareness and attitude INfertilITY Cross-sectional study
下载PDF
Human circBOULE RNAs as potential biomarkers for sperm quality and male infertility
18
作者 Liping Cheng He Jin +3 位作者 Tianheng Xiao Xiaoyu Yang Tingting Zhao Eugene Yujun Xu 《Journal of Biomedical Research》 CAS CSCD 2024年第5期473-484,I0003-I0008,共18页
Reliable molecular biomarkers to predict fertility remain scarce.The current study investigated the potential of testis-specific circBOULE RNAs as biomarkers for male infertility and sperm quality.Using reverse transc... Reliable molecular biomarkers to predict fertility remain scarce.The current study investigated the potential of testis-specific circBOULE RNAs as biomarkers for male infertility and sperm quality.Using reverse transcription-PCR and real-time reverse transcription-PCR assays,we identified seven circular RNAs from the human BOULE gene in human sperm.We observed that the expression level of circEx3-6 was significantly reduced in asthenozoospermia,while the expression levels of both circEx2-6 and circEx2-7 were decreased in terato-zoospermia,compared with the controls.Furthermore,we demonstrated that the expression level of circEx2-6 was negatively correlated with the sperm DNA fragmentation index,and the expression level of circEx2-7 was correlated with both fertilization and cleavage rates in those treated with the assisted reproductive technologies.Further functional analyses in a transgenic fly model supported the roles of circBOULE RNAs in sperm development and human male fertility.Collectively,our findings support that sperm circBOULE RNAs may serve as diagnostic biomarkers for assessing sperm motility and DNA quality.Therefore,clinical application and significance of sperm circBOULE RNAs in the assisted reproductive technologies warrant further investigation. 展开更多
关键词 human circBOULE RNAs sperm DNA fragmentation index fertilization rate cleavage rate semen parameters assisted reproductive technology
下载PDF
Analysis of Low Fertility Rates in Advanced Economies
19
作者 LI Chenkai 《Management Studies》 2024年第4期252-254,共3页
In economics,opportunity cost means the maximum value of choosing one behavior over others in the situation where resources are limited(Parkin,2016).In the process of making reproductive decision,opportunity cost reve... In economics,opportunity cost means the maximum value of choosing one behavior over others in the situation where resources are limited(Parkin,2016).In the process of making reproductive decision,opportunity cost reveals the trade-off between time,resources,and economic benefits that individuals face when choosing to have children or not.During this process,the technological changes make the paths of career development diverse and rapidly changing,remarkably increasing the opportunity cost of childbirth and parenting.This leads to individuals more inclined to postpone or reduce childbirth when balancing their careers and families,thereby resulting in low fertility rates in developed economies. 展开更多
关键词 low fertility advanced economies technological changes
下载PDF
Sperm-specific protein ACTL7A as a biomarker for fertilization outcomes of assisted reproductive technology 被引量:2
20
作者 Tian-Ying Yang Ying Chen +9 位作者 Guo-Wu Chen Yi-Si Sun Zhi-Chao Li Xiao-Rong Shen Yi-Ni Zhang Wen He Dan Zhou Hui-Juan Shi Ai-Jie Xin Xiao-Xi Sun 《Asian Journal of Andrology》 SCIE CAS CSCD 2022年第3期260-265,共6页
Obtaining high-quality embryos is one of the key factors to improve the clinical pregnancy rate of assisted reproductive technologies(ART).So far,the clinical evaluation of embryo quality depends on embryo morphology.... Obtaining high-quality embryos is one of the key factors to improve the clinical pregnancy rate of assisted reproductive technologies(ART).So far,the clinical evaluation of embryo quality depends on embryo morphology.However,the clinical pregnancy rate is still low.Therefore,new indicators are needed to further improve the evaluation of embryo quality.Several studies have shown that the decrease of sperm-specific protein actin-like 7A(ACTL7A)leaded to low fertilization rate,poor embryo development,and even infertility.The aim of this study was to study whether the different expression levels of ACTL7A on sperm can be used as a biomarker for predicting embryo quality.In this study,excluding the factors of severe female infertility,a total of 281 sperm samples were collected to compare the ACTL7A expression levels of sperms with high and low effective embryo rates and analyze the correlation between protein levels and in-vitro fertilization(IVF)laboratory outcomes.Our results indicated that the ACTL7A levels were significantly reduced in sperm samples presenting poor embryo quality.Furthermore,the protein levels showed a significant correlation with fertilization outcomes of ART.ACTL7A has the potential to be a biomarker for predicting success rate of fertilization and effective embryo and the possibility of embryo arrest.In conclusion,sperm-specific protein ACTL7A has a strong correlation with IVF laboratory outcomes and plays important roles in fertilization and embryo development. 展开更多
关键词 actin-like 7A assisted reproductive technology BIOMARKER embryo quality in‑vitro fertilization outcomes
原文传递
上一页 1 2 64 下一页 到第
使用帮助 返回顶部