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The objective of our meta-analysis was to estimate the effect of intrauterine hematoma (IUH) on obstetric and pregnancy outcomes of assisted reproductive technology (ART) pregnancies. Four electronic databases were searched up to December 2021 to find studies reporting relevant outcomes of ART pregnancies with IUH. Dichotomous data were expressed as odds ratios (OR) with 95% confidence intervals (CI). Continuous data were expressed as weighted mean difference (WMD) with 95% CI. A total of six observational studies were included in this meta-analysis. Our data suggested that IUH in pregnancies achieved by ART are not associated with increased risks of miscarriage, low birth weight, placenta previa, or premature rupture of membranes. Similar birthweight was noted between the two groups. However, IUH was associated with significantly shorter gestational age at delivery (GA) as well as higher risks of preterm birth. Subgroup analyses have found that the presence of retroplacental haematoma was associated with an increased risk of miscarriage. IUH may be associated with decreased GA and an increased risk of preterm birth. Therefore, Women diagnosed with IUH should be offered increased surveillance during the course of their pregnancy.

Objective: The purpose of this study was to screen target miRNA related to RB and explore the expression levels of target miRNA in RB and its potential value of diagnosis., Methods: The Affymetrix GeneChip miRNA 4.0 Array was used to screen the differential miRNAs in the plasma of 5 RB patients before and after intravenous chemotherapy, and the most significant down-regulated miRNA was selected for target miRNA. Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) is used to verify the expression levels of plasma target miRNA in 30 RB patients. Then, qRT-PCR was performed to further verify the expression of target miRNA in plasma of RB patients and RB tumor tissues. Finally, receiver-operating-characteristic (ROC) curve and the area under the ROC curve (AUC) were used to evaluate the diagnostic power of plasma target miRNA., Results: The miRNA Array obtain 8 core miRNAs, 1 up-regulated and 7 down-regulated, of which miR-6089 was the most significantly down-regulated. Plasma miR-6089 levels were significantly up-regulated in RB patients. Besides, in RB tumor tissues, miR-6089 levels were also obviously up-regulated. After intravenous chemotherapy, the expression of plasma miR-6089 was significantly decreased. Furthermore, ROC curve analysis showed that miR-6089 in the plasma had a good sensitivity and specificity for distinguishing RB from the healthy control group., Conclusions: MiR-6089 may be considered as a novel potential diagnostic biomarker for RB., Trial Registration Number: ChiCTR2000040154; date of registration: 2020/11/22; retrospectively registered.

The emissions of the catering industry are important sources of air pollution in megacities in China. A total of 41 restaurants in Beijing were selected as the sampling sites to evaluate the contribution of the catering industry to megacity air pollution. The original emissions load of cooking fume, particulate matter, and non-methane hydrocarbon (NMHC) were studied via field tests for different types of restaurants. The results showed that the cooking fume, particulate matter, and NMHCs generated from the kitchen were 1.93, 6.6, and 10.9 mg·m -3 , respectively. An evaluation method based on working days was developed. Considering the total number of restaurants in Beijing, the original emission loads of 2019 were calculated. The cooking fume, particulate matter, and NMHC emissions were 5512, 18849, and 6169 t, respectively. The Pearson numbers of the cooking fume emission and particular matter emission from Sichuan and Hunan cuisine, Roast Duck, Grill and Barbecue, and Chinese Home-Style cuisine were all above 0.6, which indicated a high level of correlation between the cooking fume emission and particular matter emission. Notably, the Pearson numbers of Sichuan and Hunan cuisine and Roast Duck were both higher than 0.8, which indicates a strong correlation between the cooking fume emission and particular matter emission.

To understand the atmospheric pollution emission concentration and overall emission level of the Beijing catering industry, and thus provide a basis for the targeted formulation of pollution control measures for the catering industry, this study selected typical catering enterprises in Beijing to research. Combined with the use of stoves during the on-site measurement and testing period, the emission concentrations of cooking fumes, particulates, and non-methane hydrocarbons (NMHC), and the relationship between them in different types of catering enterprises, were analyzed, and the emission of atmospheric pollutants in the Beijing catering industry was estimated. The results showed that the average concentrations of cooking fumes, particulates, and NMHC of typical catering enterprises were (2.91±5.52), (9.25±10.02), and (12.72±11.38) mg·m -3 , respectively. These all exceed the Beijing local emission standards. Of the typical catering enterprises, roast duck and barbecue had higher particulate matter and NMHC emissions, which easily exceeded the emission standard. Roast duck and barbecue are therefore the governance focus of the catering industry. The ratio of particulates to cooking fumes in roast duck, barbecue, and cooking catering enterprises ranged from 6.21 to 43.08, 5.03 to 19.07, and 0.75 to 7.55, respectively. The emission concentrations of particles are much larger than those of cooking fumes from charcoal grill and fruit-roasted duck. Pearson correlation coefficient analysis showed that the concentrations of particulates and cooking fumes in catering enterprises were strongly correlated, and the concentrations of particulates and NMHC were weakly correlated. The study estimates roughly that the emissions of cooking fumes, particulates, and NMHC were 2492, 6127, and 9436 tons, respectively, from the catering industry in Beijing in 2014.

Purpose: To perform a systematic review of reports in which the AngioVac™ percutaneous vacuum-assisted aspiration system was successfully used to debulk or remove vegetations prior to percutaneous lead extraction., Methods: We included all studies and case reports that used a percutaneous aspiration technique for vegetation removal or debulking with percutaneous lead extraction for patients with lead-associated endocarditis. Ten reports and retrospective data from our centers were used, which included a total of 88 patients and 205 leads., Results: The percutaneous aspiration procedure was completely or partially successful in 86 patients (97.7%). The lead extraction procedure itself was successful in 87 patients (98.9%). The aspiration procedure and lead extraction were done concomitantly in 81 patients (92.0%). Four patients (4.5%) had major complications (two due to vascular injuries, one due to coronary sinus injury, and one due to tricuspid valve injury). There were no complications from the aspiration procedure, and no cases were associated with procedure-related mortality., Conclusion: While patients with large vegetations have historically been referred for surgical lead extraction, data are lacking in its techniques and outcomes. Existing data suggest that percutaneous vacuum-assisted aspiration for vegetation removal or debulking in endocarditis prior to or concurrent with percutaneous lead extraction has a high success rate with a low complication rate across a broad series of patients.

This study characterized the wind erosion dust emissions from topsoil of urban roadside-tree pool. The study area is the Xicheng District of Beijing and uses GIS to obtain the spatial distribution of various road mileages. A full bore investigation method was carried out to survey tree pool in the Zhanlanlu Subdistrict to obtain the activity level of tree pool in the Xicheng district. The portable in situ wind erosion laboratory (PI-SWERL) was used to determine the emission factors of PM 2.5 from the wind erosion dust from tree pool and to estimate the PM 2.5 emission inventory of tree pool in the Xicheng District in 2016. The results showed that:①The annual emission factors per unit area of PM 2.5 from tree pool of freeways' frontage roads, major roads, minor roads, and alleys are 47.9, 7.9, 14.9, and 29.9 g·(m 2 ·a) -1 , respectively. The reduction rate of PM 2.5 emission factors from tree pool by precipitation was about 30.3% in 2016. ②The annual emission factors per unit mileage of PM 2.5 from the tree pool of freeways' frontage roads, major roads, minor roads, branch roads, and alleys are 2.57, 2.33, 4.04, 7.31, and 5.44 kg·(km·a) -1 , respectively, and the factors for branch roads are 1.3, 1.8, 2.8, and 3.1 times as much as those for alleys, minor roads, freeways' frontage roads, and major roads, respectively. Taking the emission factor for minor roads as an example, the winter emission factor is 1.3, 7.3, and 8.7 times greater than that in the spring, summer, and autumn, respectively. ③PM 2.5 emissions from the tree pool in the Xicheng District of Beijing are 1.60 t·a -1 , and the uncertainty range of the emission inventory is -143%~184%. The emissions in winter are 0.68 t·a -1 , which are 1.1, 1.42, and 5.1 times greater than that in the spring, summer, and fall, respectively. The emission values for freeways' frontage roads, major roads, minor roads, collectors, and alleys account for 5.6%, 8.7%, 23.2%, 4.1%, and 58.4% of the total emissions, respectively. It is recommended that the urban roadside-tree pool be covered to reduce wind erosion dust emissions with materials that do not affect the growth of trees as soon as possible.

As one of the characteristics of traditional food in Beijing, there is a significant difference between roast duck and other foods in the cooking process, in that fruit trees are used as fuel in the former. However, system research about the emission characteristics of this food source has not been done domestically. In order to grasp such food source emission characteristics and provide technical basis for pollution control, we selected the representative roast duck restaurant in Beijing and studied the emission characteristics of atmospheric pollutants in the cooking process of roast duck. The results showed that the emission concentrations of cooking fumes, particulate matter, volatile organic compounds (VOCs), and aldehyde and ketone compounds were (0.74±0.45), (15.32±7.93), (7.60±3.41), and (1.22±0.59) mg·m -3 , respectively. The emission concentration of particulate matter was much higher than that of cooking fumes. The VOC component composition was very complex, containing alkanes, alkenes, aromatic hydrocarbons, and oxygen VOCs, such as aldehydes, ketones, alcohols, ester compounds, and halogenated hydrocarbons, with the highest concentrations of 3-methylfuran, ethanol, and methyl acetate. The main components of aldehyde and ketone compounds were acetaldehyde, formaldehyde, and acrolein, of which C1-C3 compounds were 72.27%.

Simultaneous measurements of precursor gases NH 3 ,NO,NO 2 ,SO 2 and the main water-soluble ions in PM 2.5 such as sulphate (SO 4 2- ),nitrate (NO 3 - ) and ammonium (NH 4 + ) (collectively called SNA)were carried out in the urban area of Beijing during 2015-01 to 2015-12,which obtained 325 groups of samples. PTFE membrane filters were used to collect particulate NH 4 + , NO 3 - and SO 4 2- , followed by the online instruments to collect precursor gases. The pollution characteristics of the precursor gases and SNA were analyzed and their correlation was studied. The mean concentrations of NH 3 , NO, NO 2 , SO 2 , NH 4 + ,NO 3 - and SO 4 2- were 21.5, 17.7, 54.3, 14.2, 8.1, 13.5 and 12.7 μg·m -3 respectively during the period of monitoring, and SNA accounted for 43.4% of PM 2.5 . The concentrations of SO 2 ,NO x and SNA declined compared to 2014. The concentrations of NO,NO 2 and SO 2 were highest in winter and lowest in summer. The concentration of NH 3 was higher in summer and lower in autumn; The concentration and the percentage of NH 4 + were stable during the four seasons,both the concentrations and the percentage of NO 3 - were lowest in summer. The concentrations of SO 4 2- was highest in winter and the percentage was lowest in summer. The ratio of ([NO 3 - ]+2[SO 4 2- ]) and NH 4 + was 0.97 during the whole year, showing that anions mainly existed in the form of NO 3 - and SO 4 2- . In summer, the ratio of[NO 3 - ]+2[SO 4 2- ] and[NH 4 + ] was slightly higher than 1.0, which was the reason why NO 3 - was bound to Ca 2+ , Mg 2+ and Na + besides NH 4 + . With the increase of pollution, the mass concentration of precursor gases and SNA increased dramatically, among which NO x increased most rapidly, and SO 2 decreased from severe pollution to serious pollution. The contribution rate of NH 4 + was maintained at a relatively stable level. SO 4 2- had a higher contribution when the pollution level was lower, whereas the concentration of NO 3 - was higher than others and contributed most to PM 2.5 in heavy pollution. Heterogeneous transformation on the surface of particulate matter played a more important role in the formation of SO 4 2- and NO 3 - . The correlations between NO 3 - , NO 2 and NO,NH 4 + and NH 3 ,SO 4 2- and SO 2 were significant at the confidence level of 0.01. SO 4 2- had negative correlation with SO 2 , and NO 3 - had positive correlation with NO 2 . Compared with NH 3 , the NH 4 + concentration was more obviously affected by acid gases NO 2 , SO 2 .

Concentrations of water-soluble ions were measured in Beijing during 2014 for comparison of URG online monitoring systems and filter-based manual methods. The differences of four main ions components in spring, summer, autumn and winter were compared. The total concentrations of eight ions measured by URG online were higher than those of filter-based manual method. There was no significant differences among the annual concentrations of Cl - ,NO 3 - ,Mg 2+ and Ca 2+ obtained by the two methods, while the concentrations of SO 4 2- ,NH 4 + ,Na + ,K + from online were higher than those from filter. NO 3 - ,SO 4 2- ,Cl - had good correlations in autumn and winter, and NH 4 + only had better fitting performance in winter.

Variations of PM 2.5 concentrations and effects of pollution control measures during two red alert periods in 2015 in Beijing were analyzed based on atmospheric pollutant monitoring data. The results showed that during the first red alert, the highest hourly-averaged PM 2.5 concentration occurred at 19:00 on 9th December with a value of 282 μg·m -3 and the highest hourly PM 2.5 concentration appeared at Yongledian station which is near the southeast border of Beijing, with the peak concentration of 496 μg·m -3 . During the second red alert, the highest hourly-averaged concentration of PM 2.5 occurred at 20:00 on 22th with a value of 421 μg·m -3 . The highest hourly PM 2.5 concentration was monitored at Liulihe station which is near the southwest border of Beijing, with the peak concentration of 831 μg·m -3 . During the duration period of both red alerts, the concentrations at the southern stations were higher than those at downtown stations and the PM 2.5 concentrations at northern stations were found to be the smallest. The difference between these two red alerts was that during the second red alert, the PM 2.5 concentrations in southern Beijing were significantly higher than those in the northern area, while the magnitude of this south-to-north gradient was much smaller during the first one. During the second red alert, up to 93% of Beijing area showed an average PM 2.5 concentration of above 150 μg·m -3 , which was much larger than that in the first one. The meteorological conditions during the two red alerts were both not conducive to the spread of pollutants. Formation of secondary pollutants and regional pollutant transport existed as well. Though the stagnant weather conditions were in favor of the development of severe pollution, large regional-wide pollutant emission was the main reason for these two heavy air pollutions in Beijing. PM 2.5 concentrations were decreased by 20%-25% after the implementation of emergency response measures, which showed the significance of emission reduction in air pollution control.

Purpose: To evaluate the effect of spectral CT for metal artifact reduction in patients with pedicle screw., Methods: 45 patients with 119 pairs of pedicle screws underwent spectral CT examination. One set of conventional (140 kVp) polychromatic image and nine sets of virtual monochromatic images (60-140 keV) were obtained. The standard deviation (SD) of CT number in 12 locations around the implant and 1 on homogenous fat was measured to generate artifact index (AI). Objective assessment including AI, CT number and SD value was performed with independent t test and paired sample t test. Two radiologists independently reviewed the image quality, and Wilcoxon signed-rank test and kappa analysis were used for the subjective scores of image quality., Results: The artifact index (AI) of all the regions decreased as keV increased. AIs of 100-140 keV were lower than that of 140 kVp images. At 120 keV there was no significant difference in CT numbers of psoas major muscle and vertebral canal between pedicle screw level and pedicle level, but a significant difference in SD value was determined between the two levels. The subjective scores at 100-140 keV were higher than the images at 140 kVp, and the highest subjective score of two observers and excellent interobserver agreement were found at 120 keV (κ = 0.889)., Conclusions: Virtual monochromatic images at high-energy levels have a well-concordant effect of removing metal artifacts, and 120 keV monochromatic images provided an accurate CT number and good subjective score.

The mass concentration of PM₂.₅ associated with its online and off-line water-soluble ions were obtained during 2014- 10- 2014-11. Secondary inorganic species NO₃⁻, SO₄²⁻ and NH₄⁺ were the major components of PM₂.₅ during different observation periods. The total concentration of NO₃⁻, SO₄²⁻ and NH₄⁺ was (26.8 ± 22.5) µg · m⁻³, which contributed (41.7 ± 8.5)% to PM₂.₅. The concentration of NO₃⁻ was higher than those of others and contributed most to PM₂.₅. The ions of NO₃⁻, SO₄²⁻ NH₄⁺ and Cl⁻ all showed three different periods during 2014 Beijing APEC, besides the different meteorological condition, the cumulative effect caused by local emissions and regional pollution could also not be ignored. Although the characteristics of water-soluble ions was different during different observation periods, there was no obvious acidification of PM₂.₅ in Beijing at the end of autumn and beginning of winter.

Background: Because patients with cystic fibrosis (CF) are living longer, chronic malabsorption of carotenoids associated with CF resulting in decreased macular pigment (MP) may affect macular long-term health in later-life pathology. This study compared the macular pigment optical density (MPOD) and corresponding central macular volume (MV) of adult CF subjects and age-matched normal controls subjects to determine whether chronic malabsorption associated with CF could adversely affect macular photoreceptor anatomy., Objective: Our aim was to compare MPOD with measurements of central MV in CF patients with age-matched controls. Design. In nine adult CF patients (ages: 29-46) without a history of carotenoid supplementation or known retinal or optic nerve disease MPOD and MV were measured by heterochromatic flicker photometry (HFP) and optical coherence tomography (OCT), respectively, and compared to results obtained from 14 age-matched controls., Results: MPOD was significantly reduced at 15' and 30' eccentricities in CF subjects compared to normal subjects (mean difference -0.21 at 15', -0.25 at 30', p < 0.005). No significant difference, in MV noted at any of the eccentricities tested between CF and normal subjects (CF: normal MV ratios ranged from 0.94 to 1.1 for all eccentricities with p > 0.1 at all eccentricities). Best corrected vision acuity and fundus examination were normal in all subjects., Conclusions: Unsupplemented CF patients have markedly lower levels of macular carotenoids (e.g., lutein and zeaxanthin), but well-maintained visual function and no significant reductions in central MV primarily composed of macular photoreceptors. Future studies are needed to determine whether the lifelong decrease in protective central retinal carotenoids predisposes CF patients to later-life retinal pathology.

The life table of the green lacewing, Chrysopa pallens (Rambur), was studied at 22 degrees C, a photoperiod of 15:9 (L:D) h, and 80% relative humidity in the laboratory. The raw data were analyzed using the age-stage, two-sex life table. The intrinsic rate of increase (r), the finite rate of increase (lambda), the net reproduction rate (R0), and the mean generation time (T) of Ch. pallens were 0.1258 d(-1), 1.1340 d(-1), 241.4 offspring and 43.6 d, respectively. For the estimation of the means, variances, and SEs of the population parameters, we compared the jackknife and bootstrap techniques. Although similar values of the means and SEs were obtained with both techniques, significant differences were observed in the frequency distribution and variances of all parameters. The jackknife technique will result in a zero net reproductive rate upon the omission of a male, an immature death, or a nonreproductive female. This result represents, however, a contradiction because an intrinsic rate of increase exists in this situation. Therefore, we suggest that the jackknife technique should not be used for the estimation of population parameters. In predator-prey interactions, the nonpredatory egg and pupal stages of the predator are time refuges for the prey, and the pest population can grow during these times. In this study, a population projection based on the age-stage, two-sex life table is used to determine the optimal interval between releases to fill the predation gaps and maintain the predatory capacity of the control agent.

3,4-Dichoro-1H-pyrrole-2,5-dicarboxylic acid bis-phenylamide 3 and 3,4-dichoro-1H-pyrrole-2,5-dicarboxylic acid bis-butylamide 4 have been prepared and shown to deprotonate in the presence of basic anions: the X-ray crystal structure of the tetrabutylammonium salt of 3-H+ reveals the formation of a dimer in the solid state.