A facile and large-scale route to prepare nitrogen/oxygen (N/O) co-doped two-dimensional carbon nanomesh with excellent microwave absorption properties.

Two-dimensional porous carbon materials have been considered good candidates for developing lightweight microwave absorbers because of their low density and tunable dielectric constant. However, large-scale synthesis, with precise control of the microstructure, by a simple method, remains is still a great challenging. Herein, a two-dimensional N/O co-doped carbon nanomesh (NOCN) was prepared via large-scale route by simple carbonization of analogue polyurea (PU) nanosheet consisted of p-phenyldiisocyanate and urea, and the graphitization degree, porous structure, sheet size and the heteroatom doping content could be easily adjusted by controlling carbonization temperature.

Constructing ordered macropores in hollow Co/C polyhedral nanocages shell toward superior microwave absorbing performance.

Rational design of porous carbon architecture is essential for superior microwave absorbing performance. Herein, we report a new type of hollow porous Co/C polyhedral nanocages with ordered macropores of  ∼60 nm (HP-Co/C) as microwave absorber, which were readily manufactured by epitaxial growth of ZIF-67/SiO nanolayers on the surfaces of polyhedral ZIF-8 nanoparticle, and followed by simple calcination in Ar atmosphere and subsequent removal of SiO with HF. The ordered macropores can effectively tune the electromagnetic parameters of HP-Co/C, affording the obtained HP-Co/C composites strong attenuation capability and excellent impedance matching characteristics for electromagnetic wave (EMW) absorption.

Highlights from the 2019 International Myopia Summit on 'controversies in myopia'.

Myopia is an emerging public health issue with potentially significant economic and social impact, especially in East Asia. However, many uncertainties about myopia and its clinical management remain. The International Myopia Summit workgroup was convened by the Singapore Eye Research Institute, the WHO Regional Office for the Western Pacific and the International Agency for the Prevention of Blindness in 2019.

Macular choroidal thickness in Chinese preschool children: decrease with axial length but no evident change with age.

Aim: To explore the distribution pattern of macular choroidal thickness (ChT) and its association with age as well as refractive status in Chinese preschoolers.

Methods: School-based, cross-sectional study. A total of 550 healthy preschool children aged 3 to 6 years old from 6 kindergartens were enrolled.

Half-spaced substrate integrated spoof surface plasmon polaritons based transmission line.

In this paper, a new spoof surface plasmon polaritons (SPPs) based transmission line (TL) with semi-open structure is proposed, which is implemented on a single-layer substrate with metallized via holes planted on a ground plane. The electromagnetic (EM) power propagates along it in the form of controlled slow surface wave, which is the same with its existing counterparts. The proposed TL can adjust the degree of EM energy confinement, and thus balance its performance in every characteristic, in particular attenuation and interference.

Three-Dimensional Simultaneous Arbitrary-Way Orbital Angular Momentum Generator Based on Transformation Optics.

In wireless communications, people utilize the technology of diversity against multipath fading, so as to improve the reliability of communication equipment. One of the long-standing problems in diversity antennas is the limited number of diversity in a certain space. In this paper, we provide a solution to this issue by a three-dimensional (3D) simultaneous arbitrary-way orbital angular momentum (OAM) generator (3D SAWOG) based on transformation optics.

Inhibition of proliferation and induction of apoptosis in RB116 retinoblastoma cells by afatinib treatment.

The present study investigates the effect of afatinib on the growth, induction of apoptosis in RB116 cells, and reduction of carcinoma growth in the mice transplanted with RB116 cells. The results from MTT assay revealed that afatinib inhibited the growth of RB116 cells in a dose-dependent manner. Proliferation of RB116 cells was reduced to 64 % on treatment with 200 μM concentration of afatinib after 48 h.

TiO2 nanoparticle modified organ-like Ti3C2 MXene nanocomposite encapsulating hemoglobin for a mediator-free biosensor with excellent performances.

TiO2 nanoparticle modified organ-like Ti3C2 MXene (TiO2-Ti3C2) nanocomposite has been synthesized and then used to immobilize hemoglobin (Hb) to fabricate a mediator-free biosensor. The morphology and structure of TiO2-Ti3C2 nanocomposite were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Spectroscopic and electrochemical results revealed that TiO2-Ti3C2 nanocomposite is an excellent immobilization matrix with biocompatibility for redox protein, affording good protein bioactivity and stability.

The control effect of orthokeratology on axial length elongation in Chinese children with myopia.

Background: To retrospectively compare axial elongation in children with different degrees of myopia wearing spectacles and undergoing ortho-k treatment.

Methods: The medical records of 128 patients who were fitted with spectacles or orthokeratology (ortho-k) lenses in our clinic between 2008 and 2009 were reviewed. Ortho-k group comprised 65 subjects and 63 subjects wearing spectacles were included in the control group.

[Analysis of cataract surgical rate and its influencing factors in Shanghai, China].

Objective: To explore the cataract surgical rate (CSR) of Shanghai from 2006 to 2012 and examine its influencing factors.

Methods: As of 2003, a cataract surgery registration form had been filled by physicians after every cataract surgery in Shanghai. The local eye disease prevention team then entered the relevant information into the Shanghai Cataract Operations Database.

Cross-sectional investigation of visual impairing diseases in Shanghai blind children school.

Background: The control of blindness in children is a high priority within the VISION 2020 initiative. To determine the causes of severe visual impairment and blindness in children from Shanghai Blind Children School (SBCS) can provide useful information on childhood blindness in Shanghai.

Methods: A cross-sectional investigation of students in SBCS was conducted in May 2010.

[A prevalence investigation of blindness and vision impairment in 2009 in older adults of Dachang Blocks of Baoshan District, Shanghai, China].

Objective: To investigate the prevalence of blindness and low vision and the leading causes of blindness in residents aged≥60 years in Dachang Blocks of Baoshan District, Shanghai, China.

Methods: A cross-sectional study was carried out by Shanghai Eye Disease Prevention & Treatment Center and the Center for Disease Control and Prevention in Baoshan District of Shanghai from October to December in 2009. Randomly cluster sampling was used to identify the adults aged≥60 years who had lived in Dachang Blocks of Baoshan District, Shanghai for more than 10 years.

[Practising appropriate vision check scheme in eye diseases mass screening works].

Vision check is the first step of mass screening works of most blinding diseases. In recent China, the primary childhood vision check is mainly conducted by hygiene teachers in educational institutions, following the Chinese traditional poor vision classification system, which is based on uncorrected distance visual acuity. However, this classification system does not meet childhood vision developmental mechanism, and may lead to massive unnecessary repetitive screening, diagnosis and treatment of corrected ametropia.

[The frequency of JAK2 V617F mutation, expression level of phosphorylated JAK/STATs proteins and their clinical significance in myeloproliferative disorders patients].

Objective: To investigate the frequency of JAK2 V617F mutation in 145 myeloproliferative disorders (MPDs) patients, analyze the correlation between JAK2 V617F mutation and clinical features.

Methods: The JAK2 V617F mutation was detected by direct DNA sequencing of PCR product and allele-specific PCR respectively. The expression of JAK2, phospho-JAK2 and phospho-STAT5 proteins was determined by Western blot.

[Epidemiology of diabetic macular edema in patients with type 2 diabetes in the Beixinjing District of Shanghai].

Objective: To investigate the prevalence of diabetic retinopathy (DR) and diabetic macular edema (DME) in Beixinjing District, and analyze the image characteristics of their Optical coherence tomography (OCT), so as to evaluate the correlation among DME and the grade of DR as well as posterior vitreous detachment (PVD).

Methods: In a prospective study, OCT was performed in 151 eyes of 100 type 2 diabetes patients with DR and 102 normal eyes as control subjects.

Results: 795 cases were examined, and 215 of them were diagnosed to have DR.

[Exogenous advanced glycosylation end products induce diabetes-like vascular dysfunction in normal rats: a factor for occurrence of diabetic retinopathy].

Objective: To disclose the relationship between the deposition of advanced glycosylation end products (AGE) in the retinal vascular tissues and damage of retinal vessels in diabetic retinopathy.

Methods: Sixteen SD rats aged 2 months were divided into 4 groups, with 4 rats in each group. Rats in normal group received no treatment.