Publications by authors named "Ruoyun Lin"

20 Publications

  • Page 1 of 1

Synergistic effects of oxidation, coagulation and adsorption in the integrated fenton-based process for wastewater treatment: A review.

J Environ Manage 2022 Jan 11;306:114460. Epub 2022 Jan 11.

Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, PR China.

Fenton process is the most popular for wastewater treatment among all available advanced oxidation processes (AOPs). Numerous endeavors have been devoted to improving the oxidation efficiency of Fenton reaction in terms of promoting ·OH generation, accelerating iron redox cycle and extending applicable pH range. However, in addition to oxidation, coagulation and adsorption also simultaneously occur in the Fenton process, which play important role in the removal of pollutants. Rapid progress has revealed the synergistic effects of oxidation, coagulation and adsorption in the Fenton process, providing new ideas for the treatment of complex and refractory wastewater. Based on available studies, this review is the first to systematically summarize the research progress regarding the synergistic effects of oxidation, coagulation and adsorption in the integrated Fenton-based processes for wastewater treatment. The involved mechanism of the synergistic effects in different Fenton processes (homogeneous Fenton, heterogeneous Fenton and physical field-assistant Fenton coupling process) are critically reviewed. Furthermore, special attention has been paid to the representative applications of the synergistic effects in wastewater treatment (such as industrial organic wastewater, landfill leachate and heavy metal-organic complexes, etc.), particularly focusing on the operation parameters and removal performance. Finally, a conclusion of the review and subsequently, perspectives are given for possible research directions. We believe this review can provide useful information for researchers and end-users involved in the development and application of the Fenton process in wastewater treatment.
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http://dx.doi.org/10.1016/j.jenvman.2022.114460DOI Listing
January 2022

Laser-assisted selection of immotile spermatozoa has no effect on obstetric and neonatal outcomes of TESA-ICSI pregnancies.

Reprod Biol Endocrinol 2021 Oct 12;19(1):159. Epub 2021 Oct 12.

Reproductive Medicine Center, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530003, China.

Background: Azoospermic patients have benefited from both epididymal and testicular spermatozoa intracytoplasmic sperm injection (ICSI) treatment and lasers have been used to identify viable, immotile spermatozoa before the procedure. There are limited studies on the safety of laser-assisted selection of immotile spermatozoa. The aim of this study was to investigate the impact of laser-assisted selection of immotile spermatozoa on the obstetric and neonatal outcomes after ICSI.

Methods: A retrospective comparative study was conducted on outcomes of ICSI cycles with testicular spermatozoa from June 2014 to June 2018. Of 132 cycles, 33 were allocated to the test group and oocytes were injected with immotile spermatozoa selected by laser, 99 cycles were allocated as control group.

Results: Compared with the control group, no significant differences were found in the pregnancy, implantation, miscarriage and live birth rates in the test group in either fresh or frozen transfer cycles. The cumulative live birth rate in the test group was 69.70%, which was slightly higher than in the control group (60.61%), but this was not statistically different. There were no differences in the average gestational age, premature birth rate, neonatal birth weight, and the malformation rate between the test and control groups (P > 0.05). In addition, the obstetric outcome between the two groups were not different (P > 0.05).

Conclusions: No negative effect on perinatal and neonatal outcomes was seen by using laser-assisted selection of immotile spermatozoa for TESA-ICSI. This study endorses the use of laser-assisted selection of viable spermatozoa for ICSI cycles.
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http://dx.doi.org/10.1186/s12958-021-00835-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8507098PMC
October 2021

Does longer storage of blastocysts with equal grades in a cryopreserved state affect the perinatal outcomes?

Cryobiology 2021 Dec 11;103:87-91. Epub 2021 Sep 11.

Reproductive Medicine Center, Maternal and Child Health Hospital, Obstetrics and Gynecology Hospital of Guangxi Zhuang Autonomous Region, Nanning, PR China.

Aim: Although mammalian embryos could be preserved in liquid nitrogen for thousands of years in theoretical models, the viability of cryopreserved blastocyst with varying grades remains to be speculated. In this study, we aimed to determine whether the longer storage time of blastocysts with equal grades could negatively affect the perinatal outcomes.

Materials And Methods: Single vitrified-warmed blastocyst was divided into four grades (AA, AB/BA, BB, BC/CB) according to the blastocyst score when freezing, and each grade of blastocyst was categorized into four storage duration categories: 28 days-1 year, 1-3 years, 3-5 years, and ≥5 years. Then the perinatal outcomes with different storage time were analyzed.

Results: Our results revealed that for blastocysts with the same grade, the length of storage time had no statistical effect on blastocyst survival rate, clinical pregnancy/implantation rate, live birth rate, and abortion rate. In addition, more advanced developmental blastocyst could obtain better pregnancy outcomes regardless of the cryopreservation length. Similar neonatal outcomes were obtained over time.

Conclusions: Cryopreservation time could not negatively affect the perinatal outcomes of blastocysts with equal grades. Efficient blastocyst cryopreservation technology by vitrification can help older women obtain high-quality embryos at a young age.
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http://dx.doi.org/10.1016/j.cryobiol.2021.09.003DOI Listing
December 2021

Tannic acid-Fe complex derivative-modified electrode with pH regulating function for environmental remediation by electro-Fenton process.

Environ Res 2022 03 3;204(Pt A):111994. Epub 2021 Sep 3.

Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, PR China. Electronic address:

A heterogeneous electro-Fenton (hetero-EF) system can effectively broaden the applicable pH range, although the decreased electrogeneration efficiency of HO at elevated pH (especially neutral conditions) is unfavorable for the efficient removal of organic pollutants. Herein, a tannic acid-Fe complex derivative-modified carbon felt ([email protected]) cathode was prepared for hetero-EF treatment of organic pollutants over a wide pH range. Interestingly, the as-prepared hetero-EF cathode could act as a pH regulator that acidified the solution over a wide pH range. As expected, the [email protected] cathode exhibited excellent hetero-EF activity for the removal of diverse organic pollutants (such as methyl orange, methylene blue, sulfamerazine, bisphenol A and 2,4-dichlorophenoxyacetic acid) at neutral and even alkaline pH (removal efficiency >90 %). A total of 2.98 kWh kg COD with 83.2 % COD removal could be achieved by the [email protected] cathode for the treatment of actual textile dyeing secondary wastewater. Electrochemical characterizations proved that the [email protected] cathode had excellent electrochemical properties with improved electron transfer ability and a well-pronounced Fe(III) electroreductive response. Meanwhile, more acidic groups were newly generated during the electrochemical reaction (an increase of 30.1 %), thus dissociating more H into solution. The identification of reactive oxygen species suggested that OH and O could be responsible for the removal of organic pollutants in the [email protected] EF system. These interesting findings may provide new insights into the design of multifunctional hetero-EF cathodes for the removal of refractory organic pollutants.
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http://dx.doi.org/10.1016/j.envres.2021.111994DOI Listing
March 2022

A point of confusion for embryologists in the identification of viable spermatozoa by the eosin-nigrosin test.

Clin Exp Reprod Med 2019 Mar 1;46(1):36-40. Epub 2019 Mar 1.

Reproductive Medicine Center, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.

A viable spermatozoon is a prerequisite for fertilization in intracytoplasmic sperm injection (ICSI). Thus, it is crucial to select viable but immotile spermatozoa on the day of ICSI. We report conflicting results in the identification of viable but immotile spermatozoa between the eosin-nigrosin staining and the laser test, which resulted in confusion for embryologists during assisted reproductive technology (ART). Three patients' semen samples that showed no motile spermatozoa are described in this report. To identify viable spermatozoa, we used both the eosin-nigrosin test and the laser test for each sample, and repeated the semen analysis twice in each patient. Viable but immotile spermatozoa selected by the laser test were used for ICSI. Viable spermatozoa were detected by both the eosin-nigrosin and laser tests in two patients (case 1, 95.00% vs. 24.21% and 92.68% vs. 22.22%; case 2, 41.18% vs. 23.48% and 39.81% vs. 22.52%), indicating consistent results between the two methods. In the third patient, the eosin-nigrosin test yielded viability rates of 20.75% and 19.14%, while the result of the laser test was 0%. Thus, testicular aspiration was performed to collect viable sperm from this patient. Normal fertilization was achieved after the injection of viable but immotile spermatozoa selected from these patients by the laser test, resulting in the birth of two healthy babies. Our study documents a case where the eosin-nigrosin test showed a limitation in identifying viable but immotile spermatozoa for ART, while the laser test may overcome this limitation. Larger samples may be required to corroborate the clinical value of the laser test.
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http://dx.doi.org/10.5653/cerm.2019.46.1.36DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6436465PMC
March 2019

What triggers envy on Social Network Sites? A comparison between shared experiential and material purchases.

Comput Human Behav 2018 Aug;85:271-281

Leibniz-Institut für Wissensmedien, Germany.

Social network users often see their online friends post about experiential purchases (such as traveling experiences) and material purchases (such as newly purchased gadgets). Three studies (total  = 798) were conducted to investigate which type of purchase triggers more envy on Social Network Sites (SNSs) and explored its underlying mechanism. We consistently found that experiential purchases triggered more envy than material purchases did. This effect existed when people looked at instances at their own Facebook News Feeds (Study 1), in a controlled scenario experiment (Study 2), and in a general survey (Study 3). Study 1 and 2 confirmed that experiential purchases increased envy because they were more self-relevant than material purchases. In addition, we found (in Study 1 and 3) that people shared their experiential purchases more frequently than material purchases on Facebook. So why do people often share experiential purchases that are likely to elicit envy in others? One answer provided in Study 3 is that people actually think that material purchases will trigger more envy. This paper provides insight into how browsing SNSs can lead to envy. It contributes to the research on experiential vs. material purchases and the emotion of envy.
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http://dx.doi.org/10.1016/j.chb.2018.03.049DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5990704PMC
August 2018

Cumulus oophorus complexes favor physiologic selection of spermatozoa for intracytoplasmic sperm injection.

Fertil Steril 2018 05 28;109(5):823-831. Epub 2018 Mar 28.

Center of Reproductive Medicine, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi, People's Republic of China.

Objective: To investigate the effectiveness of cumulus oophorus complexes (COCs) in the physiologic selection of spermatozoa for intracytoplasmic sperm injection (ICSI).

Design: A prospective sibling oocytes study.

Setting: Center of reproductive medicine.

Patient(s): Couples undergoing ICSI during 2016, females aged ≤38 years, and at least six metaphase II (MII) oocytes retrieved. Sixty patients were included in the study. Of 857 MII oocytes, 429 were allocated to the study group and were injected with the sperm selected via COCs; 428 MII oocytes were allocated as controls (C) and fertilized by conventional ICSI.

Intervention(s): In the study group, ICSI was performed with spermatozoa that traversed the COCs in vitro.

Main Outcomes Measure(s): Blastocyst/top blastocyst formation rate, fertilization rate, and oocyte utilization rate.

Result(s): Oocytes injected with COC-selected spermatozoa had a significantly higher fertilization rate than the conventional ICSI group (85.31% vs. 74.77%). There were no statistically differences in cleavage and top embryo rate on day 3 between the COC-ICSI and C-ICSI groups. However, with day 5 or 6 embryos, compared with conventional ICSI, COC-ICSI significantly improved blastocyst formation rate (64.90% vs. 53.50%), blastocyst formation rate at day 5 (46.52% vs. 38.85%), top blastocyst rate (38.72% vs. 24.20%), and the usable blastocysts formation rate (62.12% vs. 46.82%). The oocyte utilization rate was improved greatly in the COC-ICSI group compared with the C-ICSI group (51.98% vs. 34.35%). Furthermore, the fertilization rate, top embryo rate on day 3, usable blastocyst rate, top blastocyst rate, and day 5 usable blastocysts rate were similar between the conventional IVF and COC-ICSI groups. Single-blastocyst transfer was performed in 82 cycles, including 44 fresh cycles and 38 frozen-thawed cycles. The cumulative embryo implantation rate in the COC-ICSI group was 64.29%, slightly higher than in the C-ICSI group (53.85%), but there was no statistical difference.

Conclusion(s): The use of COCs to select spermatozoa for ICSI appears to be effective and led to a statistically significant improvement in blastocyst development and quality.
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http://dx.doi.org/10.1016/j.fertnstert.2017.12.026DOI Listing
May 2018

A universal and enzyme-free immunoassay platform for biomarker detection based on gold nanoparticle enumeration with a dark-field microscope.

Analyst 2017 Nov;142(22):4201-4205

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Developing an enzyme-free, non-amplification strategy for biomarker detection with universality and easy implementation is of central importance in clinical diagnosis and therapeutic monitoring. Herein, we report for the first time a universal and enzyme-free magnetic bead-based sandwich-format immunoassay platform for biomarker detection by combining secondary antibody functionalized AuNPs and automatic AuNP counting readout. For the prostate specific antigen (PSA), the detection limit is found to be 1 ng mL, and the spike recoveries (n = 3) with 10% fetal bovine serum are 113.5% for 2 ng mL and 107.7% for 10 ng mL. The assay also presents reasonable repeatability as indicated by the coefficient of variance of 13.1% with 5 measurements in 60 days. This strategy has been successfully applied to the determination of carcinoembryonic antigen (CEA) and alpha-fetoprotein (AFP), demonstrating the universality of this strategy. Our proposed non-amplification platform presents sensitivity comparable to that of the enzyme-linked immunosorbent assay (ELISA) with better repeatability; and more importantly, our method has better simplicity than most of the amplification-based methods, and thus is more suitable for routine analysis. The highlights of our work suggest that it is a promising method and would be potentially an alternative for ELISA in laboratories where routine analyses are intensively performed.
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http://dx.doi.org/10.1039/c7an01495cDOI Listing
November 2017

A new insight into male fertility preservation for patients with completely immotile spermatozoa.

Reprod Biol Endocrinol 2017 Sep 18;15(1):74. Epub 2017 Sep 18.

Reproductive Medicine Center, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530003, China.

Background: Sperm cryopreservation is the most effective method to preserve male fertility but this is normally used for motile spermatozoa. Thus, only motile spermatozoa are used for cryopreservation in most reproductive medicine centers worldwide. The immotile spermatozoa from some problematic patients are usually discarded, resulting in a missed opportunity of sterility cryopreservation for future assisted reproductive treatments. Many studies have shown that successful fertilization can be obtained after selection of viable sperm from the completely immotile spermatozoa before ICSI. Whether the completely immotile spermatozoa are worth of freezing has not been realized The aim of this study is to explore the clinical value of cryopreservation of immotile spermatozoa.

Methods: Completely immotile spermatozoa were collected and frozen, and subsequently viable but immotile frozen-thawed spermatozoa were selected by laser plus for ICSI. Main outcomes included spermatozoa survival index, fertilization rate and good quality embryo rate.

Results: After identification by laser, the fresh samples of spermatozoa presented with a mean survival rate of 54.86% and 26.05%, and this was reduced to 44.13% and 18.13% in frozen-thawed spermatozoa samples, which showed a frozen-thawed spermatozoa survival index of 0.80 and 0.70 in the testicular and ejaculate sperm, respectively. There were no statistically differences in fertilization rate (80% vs80.51%, 75.00% vs 81.48%), cleavage rate (95.45% vs 98.95%, 100.00% vs 95.45%) and good quality embryo rate (40.48% vs 52.13%, 33.33%vs38.10%) between the frozen-thawed immotile spermatozoa group and the routine fresh immotile spermatozoa ICSI group in both testicular and ejaculate sperm, respectively.

Conclusions: The results of the study show that completely immotile spermatozoa can be frozen in order to preserve male fertility as long as viable spermatozoa are present. This procedure provides a further possibility for fertility preservation for patients with completely immotile spermatozoa.
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http://dx.doi.org/10.1186/s12958-017-0294-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5604404PMC
September 2017

Rapid and specific luminescence sensing of Cu(ii) ions with a porphyrinic metal-organic framework.

Chem Commun (Camb) 2017 Sep;53(72):9986-9989

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.

We herein present a porphyrinic metal-organic framework (MOF) as a highly sensitive fluorescent probe targeting Cu(ii) ions with a fast response. The well-isolated nature of porphyrin moieties within the framework greatly enable accessible recognition sites, which leads to an outstanding detection limit performance of 67 nM among MOF-based materials.
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http://dx.doi.org/10.1039/c7cc04250gDOI Listing
September 2017

Influence of the insemination method on the outcomes of elective blastocyst culture.

Clin Exp Reprod Med 2017 Jun 30;44(2):85-89. Epub 2017 Jun 30.

Center of Reproductive Medicine, Guangxi Maternal and Child Health Hospital, Nanning, China.

Objective: The aim of this study was to explore the effects of the insemination method on the outcomes of elective blastocyst culture.

Methods: We retrospectively analyzed the outcomes of elective blastocyst culture performed between January 2011 and December 2014.

Results: There were 2,003 cycles of conventional fertilization (IVF) and 336 cycles of intracytoplasmic sperm injection (ICSI), including 25,652 and 4,164 embryos that underwent sequential blastocyst culture, respectively. No significant differences were found in the female patients' age, basal follicle-stimulating hormone level, basal luteinizing hormone level, body mass index, number of oocytes, maturity rate, fertilization rate, or good-quality embryo rate. However, the blastocyst formation rate and embryo utilization rate were significantly higher in the conventional IVF group than in the ICSI group (54.70% vs. 50.94% and 51.09% vs. 47.65%, respectively, <0.05). The implantation/pregnancy rate (IVF, 50.93%; ICSI, 55.10%), miscarriage rate (IVF, 12.57%; ICSI, 16.29%), and live birth rate (IVF, 42.12%; ICSI, 44.08%) were similar (>0.05). No cycles were canceled due to the formation of no usable blastocysts.

Conclusion: Although the fertilization method had no effect on clinical outcomes, the blastocyst formation rate and embryo utilization rate in the ICSI group were significantly lower than those observed in the conventional IVF group. Therefore, more care should be taken when choosing to perform blastocyst culture in ICSI patients.
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http://dx.doi.org/10.5653/cerm.2017.44.2.85DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5545224PMC
June 2017

Constructing a Robust Fluorescent DNA-Stabilized Silver Nanocluster Probe Module by Attaching a Duplex Moiety.

Chemistry 2017 Aug 20;23(45):10893-10900. Epub 2017 Jul 20.

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.

Fluorescent DNA-templated silver nanoclusters (DNA-Ag NCs) have served as excellent luminescent probes and operation units in various applications. However, the fluorescence property of DNA-Ag NCs is very sensitive to elongation or modification of the DNA template, limiting the breadth of applications. In this work, we propose a strategy for constructing a robust fluorescent DNA-Ag NCs probe module by attaching a duplex moiety to the nanocluster-bearing sequence. The fluorescence intensity of the DNA-Ag NCs can be enhanced 90-fold upon hybridization of the elongated moiety. Adenine in the linker sequence has a further enhancing effect on the fluorescence intensity, whereas thymine has a quenching effect. The transformation from a non-fluorescent species to fluorescent nanoclusters is responsible for the fluorescence enhancement with duplex formation of the elongated moiety. We hope that this design will aid future diversification of experimental designs to facilitate more applications that are currently limited by the aforementioned problems.
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http://dx.doi.org/10.1002/chem.201701879DOI Listing
August 2017

Self-disclosure on SNS: Do disclosure intimacy and narrativity influence interpersonal closeness and social attraction?

Comput Human Behav 2017 May;70:426-436

Leibniz-Institut für Wissensmedien, Germany.

On social media, users can easily share their feelings, thoughts, and experiences with the public, including people who they have no previous interaction with. Such information, though often embedded in a stream of others' news, may influence recipients' perception toward the discloser. We used a special design that enables a quasi-experience of SNS browsing, and examined if browsing other's posts in a news stream can create a feeling of familiarity and (even) closeness toward the discloser. In addition, disclosure messages can vary in the degree of intimacy (from superficial to intimate) and narrativity (from a random blather to a story-like narrative). The roles of disclosure intimacy and narrativity on perceived closeness and social attraction were examined by a 2 × 2 experimental design. By conducting one lab study and another online replication, we consistently found that disclosure frequency, when perceived as appropriate, predicted familiarity and closeness. The effects of disclosure intimacy and narrativity were not stable. Further exploratory analyses showed that the roles of disclosure intimacy on closeness and social attraction were constrained by the perceived appropriateness, and the effects of narrativity on closeness and social attraction were mediated by perceived entertainment value.
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http://dx.doi.org/10.1016/j.chb.2017.01.012DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5348110PMC
May 2017

Effect of different artificial shrinkage methods, when applied before blastocyst vitrification, on perinatal outcomes.

Reprod Biol Endocrinol 2017 Apr 26;15(1):32. Epub 2017 Apr 26.

Center of Reproductive Medicine, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi, 530003, China.

Background: In recent years, single blastocyst transfer combined with vitrification has been applied widely, which can maximize the cumulative pregnancy rate in per oocyte retrieval cycles and minimize the multiple pregnancy rate. Thus, the guarantee for these is the effectiveness of vitrified blastocyst. Studies has shown that AS of the blastocoel cavity prior to vitrification can reduce injuries, increase the thawed blastocyst survival rate and implantation rate. Several AS methods have been established. However, only a few studies have compared the effectiveness and safety of these AS methods. In this study, we aimed to compare the clinical outcomes and neonatal outcomes in FET cycles with single blastocyst that were artificially shrunk before vitrification by either LAS or MNAS method.

Methods: A retrospective comparative study of FET cycles in infertile patients which were at our clinic between January 2013 and December 2014. These FET cycles were divided into two groups by the shrinking methods used before vitrification and the clinical and neonatal outcomes were assessed.

Results: There were no statistically differences in blastocyst survival rates (95.40% vs 94.05%, P > 0.05) between the LAS and MNAS groups. However, compared with MNAS, LAS improved the warmed blastocyst implantation/clinical pregnancy rate (60.82% vs 54.37%, P < 0.05), live birth rate (50.43% vs 45.22%, P < 0.05) and also increased the monozygotic twin rate (4.07% vs 1.73%, P < 0.05). There were no differences in the average gestational weeks (38.83 ± 1.57 vs 38.74 ± 1.75), premature birth rate (0.30% vs 0.49%), average birth weight (3217.89 ± 489.98 g vs 3150.88 ± 524.03 g), low birth weight rate (5.60% vs 8.63%) and malformation rate (0.59% vs 0.48%) (P > 0.05).

Conclusions: No significant differences in neonatal outcomes were observed, while in clinical outcomes, LAS improved the warmed blastocyst implantation/clinical pregnancy rate and live birth rate markedly, there was also an increased risk of monozygotic twin pregnancies.
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http://dx.doi.org/10.1186/s12958-017-0252-7DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5406977PMC
April 2017

Blastocoele re-expansion time in vitrified-warmed cycles is a strong predictor of clinical pregnancy outcome.

J Obstet Gynaecol Res 2017 Apr 26;43(4):689-695. Epub 2017 Jan 26.

Reproductive Medicine center, Maternal and Child Health Hospital, Obstetrics and Gynecology Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.

Aim: To assess the predictive value of blastocoele re-expansion time in clinical pregnancy outcome in vitrified-warmed cycles.

Methods: Data on 468 single vitrified-thawed blastocyst transfer cycles (in patients aged <38 years) carried out from January 2012 through December 2012, at the Reproductive Medicine Center, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, were analyzed. Vitrified-warmed blastocysts were divided into three groups according to blastocoele re-expansion time: group A, <1 h; group B, 1-2 h; and group C, >2 h, and the clinical pregnancy outcomes (i.e. live birth rate, miscarriage rate and occurrence of singleton pregnancies) compared between the groups.

Results: Significant differences were observed in the implantation/clinical pregnancy rate between groups A, B and C (70.10%, 51.76% and 28.74%, respectively, P < 0.01). There was a significant linear decline in this rate with increasing blastocyst re-expansion time. The rate of miscarriage also tended to increase with increasing blastocyst re-expansion time, but the difference was not statistically significant (P > 0.05). Of the pregnant patients, no significant difference was observed in the rates of monozygotic twins and ectopic pregnancy between the three groups. For the newborns, similar live birth, low-birthweight and premature delivery rates were observed between the groups.

Conclusions: Timing of blastocoele re-expansion in vitrified-warmed cycles is a strong predictor of clinical pregnancy outcome. The faster the re-expansion of the blastocoele, the higher the developmental potential of the blastocysts.
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http://dx.doi.org/10.1111/jog.13257DOI Listing
April 2017

Pre-Incubation of Auric Acid with DNA Is Unnecessary for the Formation of DNA-Templated Gold Nanoclusters.

Chem Asian J 2016 06 2;11(11):1677-81. Epub 2016 May 2.

College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

The rationale for the preparation of DNA-templated gold nanoclusters (DNA-Au NCs) has not been well understood, thereby slowing down the advancement of the synthesis and applications of DNA-Au NCs. The interaction between metal ions and the DNA template seems to be the key factor for the successful preparation of DNA-templated metal nanoclusters. With the help of circular dichroism in this contribution, we put efforts into interrogating the necessity of pre-incubation of HAuCl4 with poly-adenine template in the formation of Au NCs by citrate reduction. Our results revealed that the pre-incubation of HAuCl4 with poly-adenine is not favorable for the formation of Au NCs, which is distinctly different from the formation process for silver nanoclusters. It is our hope that this study can provide guidance in the preparation of Au NCs with more DNA templates.
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http://dx.doi.org/10.1002/asia.201600285DOI Listing
June 2016

Nonamplification Sandwich Assay Platform for Sensitive Nucleic Acid Detection Based on AuNPs Enumeration with the Dark-Field Microscope.

Anal Chem 2016 Apr 31;88(8):4188-91. Epub 2016 Mar 31.

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China.

A simple and efficient assay platform with high sensitivity, convenient implementation, and moderate cost in reagents and instrumentation is most appropriate for routine applications. On the basis of the gold nanoparticle (AuNP) enumeration signal readout mode established in our laboratory, we have developed a nonamplification sandwich assay for nucleic acid detection with the 3 fM limit of detection for a sequence related to Alzheimer's disease. This AuNP counting based method takes advantages of the distinctive and strong localized surface plasmon resonance light scattering with the dark-field microscope and magnetic separation. It is shown that the presence of 20 nM random DNA sequence or calf thymus DNA with a mass up to 10(6)-fold of the targets do not significantly interfere with the assay signal. The spike recoveries of Hela cell lysate sample at 109.3% for 20 pM target and 110.5% for 100 pM target indicate the potential of this proposed method in practical sample applications. This nonamplification sandwich assay platform in principle is applicable to other assays such as the immunoassay and thus would be expected to find a breadth of applications that can make the best use of the simplicity and sensitivity.
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http://dx.doi.org/10.1021/acs.analchem.6b00535DOI Listing
April 2016

The emotional responses of browsing Facebook: Happiness, envy, and the role of tie strength.

Comput Human Behav 2015 Nov;52:29-38

Leibniz-Institut für Wissensmedien (Knowledge Media Research Center), Tübingen, Germany.

On Facebook, users are exposed to posts from both strong and weak ties. Even though several studies have examined the emotional consequences of using Facebook, less attention has been paid to the role of tie strength. This paper aims to explore the emotional outcomes of reading a post on Facebook and examine the role of tie strength in predicting happiness and envy. Two studies - one correlational, based on a sample of 207 American participants and the other experimental, based on a sample of 194 German participants - were conducted in 2014. In Study 2, envy was further distinguished into benign and malicious envy. Based on a multi-method approach, the results showed that positive emotions are more prevalent than negative emotions while browsing Facebook. Moreover, tie strength is positively associated with the feeling of happiness and benign envy, whereas malicious envy is independent of tie strength after reading a (positive) post on Facebook.
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http://dx.doi.org/10.1016/j.chb.2015.04.064DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4710707PMC
November 2015

Automatic enumeration of gold nanomaterials at the single-particle level.

Anal Chem 2015 Mar 16;87(5):2576-81. Epub 2015 Feb 16.

Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing, 100871, China.

In this study, we developed a highly sensitive automatic counting method for gold nanomaterials at the single particle level, which can serve as a general sensing platform based on counting of gold nanomaterials. This method substantially improved the sensitivity and accuracy for AuNP counting by adopting the color image processing based on the distinctive localized plasmonic light-scattering of gold nanomaterials. The 60-nm AuNPs, with concentrations down to 4 fM, can be detected with our method. As a universal counting approach for gold nanomaterials, such as gold nanospheres, nanorods, and aggregates from particles under detectable size, this quantification method should be versatile to a breadth of applications.
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http://dx.doi.org/10.1021/ac503756fDOI Listing
March 2015

N-acetylcysteine induced quenching of red fluorescent oligonucleotide-stabilized silver nanoclusters and the application in pharmaceutical detection.

Anal Chim Acta 2013 Sep 26;793:79-85. Epub 2013 Jul 26.

Department of Chemical Biology, School of Pharmaceutical Sciences, Peking University, Beijing 100083, China.

In this work, we reported a new, simple and sensitive method for determination of N-acetylcysteine (NAC) based on quenching of the red fluorescence of oligonuleotide-protected silver nanoculsters (Ag NCs) with the quantum yield of 68.3±0.3%. This method was successfully used for the assay of NAC granules presenting a linear range from 100 nM to 1200 nM (LOD of 50 nM) with minimal interferences from potential coexisting substances. It is for the first time that quenching performance of the thiol-containing compound was found to follow a non-linear Stern-Volmer profile, indicative of a complicated quenching mechanism with static quenching dominating, in which DNA-template of Ag NCs was partly replaced by NAC, as elucidated by spectral investigations. This study extended the analytical application of silver nanoclusters as well as provided a more insightful understanding of the quenching mechanism of thiol-compounds on the fluorescence of Ag NCs.
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http://dx.doi.org/10.1016/j.aca.2013.07.037DOI Listing
September 2013
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