Organohydrogel-based transparent terahertz absorber via ionic conduction loss.

The fast-growing terahertz technologies require high-performance terahertz absorber for suppressing electromagnetic interference. Since the dissipation mechanism in terahertz band usually focuses on electronic conduction loss, almost all terahertz absorbers are constructed with electronically conducting materials being opaque, which limits their applications in scenarios requiring high visible transmittance. Here, we demonstrate a transparent terahertz absorber based on permittivity-gradient elastomer-encapsulated-organohydrogel. Our organohydrogel-based terahertz absorber exhibits a high absorbing property (average reflection loss of 49.03 dB) in 0.5-4.5 THz band with a thin thickness of 700 µm and a high average visible transmittance of 85.51%. The terahertz absorbing mechanism mainly derives from the ionic conduction loss of the polar liquid in organohydrogel. Besides, the hydrophobic and adhesive elastomer coating endows this terahertz absorber high absorbing stability and interfacial adhesivity. This work paves a viable way to designing transparent terahertz absorbers.

Evaluation of the up-to-7 criterion for determining the treatment of hepatocellular carcinoma in Barcelona Clinic Liver Cancer stage B: a single-center retrospective cohort study.

Background: At present, there are still disputes on the treatment of surgery for patients with stage B hepatocellular carcinoma (HCC). This study sought to investigate whether the up-to-7 criterion could be used to decide the treatment for HCC in Barcelona Clinic Liver Cancer stage B (BCLC-B). Methods: We analyzed 340 patients with HCC in BCLC-B who treated with hepatectomy or transcatheter arterial chemoembolization (TACE). Of the 285 HCC patients who underwent hepatectomy, 108 met the up-to-7 criterion and 177 exceeded it. All 55 patients in the TACE group met the up-to-7 criterion. We obtained the tumor status of the patients through inpatient medical records, outpatient medical records, and telephone follow-up of the hospital. We compared overall survival (OS) and progression-free survival (PFS) were compared between patients who met the up-to-7 criterion and who underwent either hepatectomy or TACE. OS and recurrence time were also compared between the patients who were treated with hepatectomy and who either met or exceeded the up-to-7 criterion. Across BCLC-B patients, we compared the OS of patients after surgical treatment between subgroups stratified by tumor number and diameter. Results: Patients who met the up-to-7 criterion had significantly higher OS rates after hepatectomy than TACE (P<0.001). However, the 2 groups did not differ in terms of PFS (P=0.758). Among the patients treated by hepatectomy, the OS rates were significantly higher in patients who met the up-to-7 criterion than in those who exceeded it (P=0.001). The recurrence rates did not differ between patients who met or exceeded the criterion (P=0.662). OS was significantly higher in patients with ≤3 tumors than those with >3 tumors (P=0.001). When we stratified patients with ≤3 tumors based in whether they met or exceeded the up-to-8 to up-to-15 criterion, OS was significantly better among those who met the criterion in all cases. Conclusions: Hepatectomy appears to be associated with better survival than TACE in patients with BCLC-B HCC who meet the up-to-7 criterion, but this criterion is not a strict indication for deciding whether to treat patients with BCLC-B surgically. Tumor number strongly affects the prognosis of BCLC-B patients after hepatectomy.

Construction and application of carbon aerogels in microwave absorption.

Electromagnetic pollution that threatens human health, the ecological environment and electronic equipment has been recognized as a serious environmental issue. In view of this, microwave absorbing materials (MAMs) are urgently required in modern society. Compared with traditional MAMs, carbon aerogels have inherent advantages in microwave absorption because of their high porosity and controllable conductive networks. Moreover, they are self-supporting 3D architectures with tailorable shapes, which satisfy most application scenarios. Therefore, carbon aerogels have aroused great interest in recent years and are being developed as promising absorption materials. In this review, we emphasize recent developments in carbon-aerogel-based MAMs constructed with some typical carbon nanomaterials, including graphene, carbon nanotubes and pyrolytic carbon. Their preparation methods, especially some newly developed strategies, are introduced as well as their influence on the structures and properties of aerogels. With a brief analysis of classic microwave absorption processes, we propose the requirements and strategies for modifying carbon aerogels to achieve ideal microwave absorption performance. Finally, we provide comprehensive comparisons of the MA performances of various carbon aerogels that show application potential and set forth the challenges and prospects of this kind of MAM.

Aircraft Noise Reduction Strategies and Analysis of the Effects.

In this study, six aircraft noise reduction strategies including the optimization of aircraft type, regulation of night flight number, optimization of flight procedure, modification of operating runway, land use planning and installation of sound insulation windows were proposed to alleviate the harmful impact of aircraft noise on the local area and population near Guangzhou Baiyun International Airport (BIA) in China. The effects of all proposed strategies except for land use planning and sound insulation windows were simulated and analyzed using CadnaA software. The results indicate that these noise reduction strategies have their own advantages and each of them can serve as an effective noise reduction measure for different applications. For instance, the replacement of noisy aircraft with low-noise aircraft can simultaneously reduce the area and population exposed to a high noise level, while the optimization of flight procedure can only reduce the population exposed under relatively low noise levels (70 ≤LWECPN ≤ 75 dB). Nevertheless, the modification of operating runway is more effective in reducing the population suffering under high noise levels (LWECPN > 85 dB). Among these strategies, reducing the number of night flights is found to be most effective in reducing the overall noise-exposed area and population. Additionally, with the assistance of noise mapping, proper land use planning was suggested according to national standards, and the installation of sound insulation windows with different sound reduction grades can be determined for different areas impacted by the aircraft noise of BIA. It is believed that the results of this study can be applied as a reference in selecting suitable noise reduction strategies to improve the acoustic environment of a specific airport.

Complete response by patients with advanced hepatocellular carcinoma after combination immune/targeted therapy and transarterial chemoembolization: two case reports and literature review.

Background: Effective treatment for patients with advanced unresectable hepatocellular carcinoma (HCC) is severely lacking. The most common clinical treatments include a combination of immunotherapy, molecular targeted agents, and transarterial chemoembolization (TACE). The combinations of therapies most likely to lead to complete recovery are unclear. The cases in this study were treated with TACE therapy and radiofrequency ablation followed by massive tumor antigen release as a way to enhance the effect of immune and targeted therapy, and TACE therapy followed by combination with programmed death 1 (PD-1) inhibitors and molecular targeted drugs may achieve better efficacy. We share two cases of advanced HCC patients who achieved complete response (CR) after treatment with PD-1 inhibitor combined with Lenvatinib and TACE and radiofrequency ablation to provide a reference for the treatment choice of advanced HCC patients. Case Description: We report two case studies of two Chinese men with advanced primary HCC (Barcelona Clinic Liver Cancer stage C) involving portal vein carcinoma thrombosis and Child-Pugh A liver function. Complete regression of the lesions and thrombosis was reached after TACE and radiofrequency ablation, followed by the combination of PD-1 inhibitor and Lenvatinib. Conclusions: We speculate that patients with advanced HCC with Child-Pugh A liver function may have better efficacy if they are treated with TACE and radiofrequency ablation followed by tumor necrosis and release of intratumoral antigens to achieve the effect of intensive immune and targeted therapy, and then sequential application of PD-1 inhibitors combined with molecular targeted drugs for conversion therapy. Further stimulate the body's immunity, so that the patient may reach CR. However, because surgical resection pathology was not performed, it is not clear whether pathological CR was achieved and the future prognosis remains to be further observed.

Management of a uterine serosal heterotopic pregnancy after in vitro fertilization in a woman with bilateral salpingectomy: A case report and literature review.

RATIONALE: Heterotopic pregnancy (HP) is defined as the simultaneous presence of intrauterine pregnancy and ectopic pregnancy (EP). HP after bilateral salpingectomy is extremely rare and may lead to serious complications if it is misdiagnosed and untreated timely. Here, we presented the first reported case of uterine serosal HP in a woman after assisted reproductive technology with bilateral salpingectomy because of bilateral tubal ectopic pregnancy. PATIENT CONCERNS: A 27-years-old pregnant woman after in vitro fertilization with bilateral salpingectomy complained of a sudden onset of unprovoked abdominal pain, which was persistent and dull. She denied vaginal bleeding. DIAGNOSES: Serum beta-human chorionic gonadotropin levels are difficult to predict HP. Transvaginal ultrasonography demonstrated 1 gestational sac in the uterine cavity and 1 thick-walled cystic mass over the upper of the uterus, with a large amount of fluid in the Pouch of Douglas. Emergency laparotomy revealed a uterine serosal pregnancy combined with intrauterine pregnancy. INTERVENTIONS: This patient was successfully managed via emergency laparotomy to remove residual tissue and repair the rupture of the uterine serosal pregnancy. OUTCOMES: At postoperative 4 days, repeat transvaginal ultrosonography presented 1 intrauterine gestational sac with a visible fetal bud and cardiac tube pulsation. Now the patient recover well and is in an ongoing pregnancy. LESSONS: It is noteworthy that HP/ectopic pregnancy is still not prevented after bilateral salpingectomy. In cases of multiple embryo transfer, even if intrauterine pregnancy has been established, it is important to rule out HP/ectopic pregnancy in time. Early diagnosis and early management can significantly improve clinical outcomes.

The effect of PPP2CA expression on the prognosis of patients with hepatocellular carcinoma and its molecular biological characteristics.

BACKGROUND: To investigate the role of the PPP2CA gene in the prognosis of patients with hepatocellular carcinoma (HCC) and its molecular biological characteristics. METHODS: We performed comparison of the expression of PPP2CA in HCC and non-HCC tissues of HCC patients who underwent surgery for the first time in the Tumor Hospital of Guangxi Medical University from July 2017 to July 2019, and retrospectively analyzed the relevant clinical data and prognosis. The GSE76427 data set and bioinformatics and public databases were used to compare the expression of PPP2CA between HCC and non-cancer tissues. Gene Ontology (GO) analysis was performed of PPP2CA and its differential genes and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway. A protein-protein interaction (PPI) network of PPP2CA and its differentially expressed genes (DEGs) was constructed from the Search Tool for the Retrieval of Interacting Genes/Proteins (STRING) database and visualized by Cytoscape software. RESULTS: The immunohistochemistry (IHC) of tissue sections confirmed that PPP2CA was highly expressed in most HCC tissues; the high expression of PPP2CA was significantly correlated with microvascular invasion (MVI) and portal vein tumor thrombi (P<0.05). Participants in the PPP2CA high expression group had worse overall survival (OS; P=0.04) and recurrence-free survival (RFS; P=0.019). The PPP2CA gene and 71 DEGs were mainly enriched in the nuclear division, organelle fission, nuclear chromosome separation, and chromatid separation process, and KEGG analysis revealed enrichment in drug metabolism-cytochrome metabolism of xenobiotics by P450 and cytochrome P450. Finally, through the PPI network, CCNA2, AURKB, TOP2A, NCAPG, MCM2, CDC20, CCMB2, AURKA, and MGST1 were identified as the top 9 highly connected hub genes. CONCLUSIONS: The PPP2CA gene is highly expressed in HCC tissues. The high expression of PPP2CA is significantly associated with poor prognosis. Through the analysis of DEGs, GO and KEGG pathway analysis, it was found that PPP2CA may act on liver cancer through multiple targets and multiple pathways, and PPP2CA plays a promoting role in HCC.

Two new secondary metabolites from a mangrove-derived fungus Cladosporium sp. JJM22.

Two new compounds (1 and 2), together with six known compounds (3-8), were obtained from the Cladosporium sp. JJM22, an endophytic fungus isolated from the stem bark of the mangrove plant Ceriops tagal collected in South China Sea. Their structures were elucidated on the basis of detailed spectroscopic analysis. The absolute configurations of 1 and 2 were confirmed by the comparison of optical rotation and the CD data with those of known compounds. The inhibitory activities of the isolated compounds against six terrestrial pathogenic bacteria and human cervical carcinoma Hela cell line were evaluated. Compound 3 exhibited a broad spectrum of antibacterial activities.

[L-carnitine improves sperm acrosin activity in male infertility patients].

OBJECTIVE: To evaluate the effect of L-carnitine (LC) on low sperm acrosin activity in infertile man. METHODS: A total of 240 male infertility patients with low sperm acrosin activity were randomly assigned to an LC group (n = 180) and a control group (n = 60) to be treated with LC (1g, tid) and vitamin E (VE) capsules (100 mg, tid) respectively, both for 3 months. Based on the results of routine semen analysis, the patients in the experimental group were further divided into oligozoospermia, asthenozoospermia and normozoospermia subgroups. Semen parameters and sperm acrosin activity were examined before and after treatment. RESULTS: Totally, 220 of the patients completed the treatment and follow-up, 163 in the LC medication and 57 in the VE control group. Compared with the baseline, the percentage of progressively motile sperm (PMS) was significantly increased in the LC group after 3 months of treatment (ï¼»32.58 ± 1.13ï¼½% vs ï¼»36.35 ± 1.26ï¼½%, P < 0.05), and so was sperm acrosin activity (ï¼»37.05±0.66ï¼½ vs ï¼»58.61±1.93ï¼½ µIU/106 sperm, P < 0.01). Sperm concentration, PMS and sperm acrosin activity were also improved in the VE control group after treatment, but with no statistically significant difference (P > 0.05). In comparison with pretreatment, remarkable increases were observed after LC medication in sperm concentration in the oligozoospermia subgroup (ï¼»11.27 ± 0.73ï¼½ vs ï¼»21.82 ± 4.21ï¼½ ×106/ml, P < 0.01) and PMS in the asthenozoospermia patients (ï¼»20.61 ± 0.85ï¼½% vs ï¼»29.81 ± 1.88ï¼½%, P < 0.01). And sperm acrosin activity was even higher after treatment in the asthenozoospermia than in the oligozoospermia and normozoospermia subgroups (ï¼»60.85 ± 3.04ï¼½ vs ï¼»56.32 ± 2.86ï¼½ and ï¼»57.09 ± 6.31ï¼½ µIU/106 sperm, P < 0.05). CONCLUSIONS: L-carnitine can effectively elevate sperm acrosin activity in male infertility patients, particularly in those with asthenozoospermia.