CoSe nanoparticles in-situ grown in 3D honeycomb carbon for high-performance lithium storage.

Although transition metal selenides are considered to be extremely promising anode materials for lithium-ion batteries (LIBs), severe volume changes and low electronic conductivity are their huge and unavoidable challenges. To solve these problems, CoSe nanoparticles in-situ grown on the inner surface of every macropore of 3D honeycomb C is successfully synthesized by three simple steps: dense assembling of polystyrene spheres, calcination and gaseous selenylation. The sizes of CoSe and honeycomb pores are 10-15 nm and 190 nm, respectively. The content of CoSe is 72 wt%. This unique architecture guarantees high electrochemical activity, rapid reaction kinetics and excellent structural stability of CoSe, as identified by cycling and rate performance measurements, various electrochemical kinetics analyses and ex-situ characterization of the cycled electrode material. As a result, the CoSe@honeycomb C anode exhibits extraordinary cycling performance (823.5 mAh g-1 after 200 cycles at 0.5 A g-1, 610.1 mAh g-1 after 250 cycles at 2 A g-1, 247 mAh g-1 after 1500 cycles at 5 A g-1) and exceptional rate capability (261.9 mAh g-1 at 10 A g-1, 1491.4 mAh g-1 at 0.1 A g-1), demonstrating that it is a potential anode material for high-performance LIBs.

Pomegranate-like C@TiO2 mesoporous honeycomb spheres for high performance lithium ion batteries.

Pomegranate-like C@TiO2 mesoporous honeycomb spheres have been synthesized through two simple steps: formation of TiO2 mesoporous honeycomb spheres and the coating of polypyrrole followed by carbonization. TiO2 mesoporous honeycomb spheres are of large specific surface area of 153 m2 g-1 and contain abundant mesopores, which leads to high electrochemical activity and good kinetic performance of TiO2. A layer of amorphous carbon shell with the thickness of 30-40 nm tightly encapsulates a TiO2 mesoporous honeycomb sphere, forming a novel pomegranate-like small sphere, which significantly improves electronic conductivity and structural stability of TiO2. Benefiting from the unique pomegranate-like structure, C@TiO2 mesoporous honeycomb spheres exhibit high specific capacity, stable long-term cycling performance and good rate capability as an anode material for lithium ion batteries (LIBs). After 500 cycles at 1 C, the discharge capacity still reaches 184 mAh g-1. The electrochemical performance is superior to pure TiO2 mesoporous honeycomb spheres and most of the reported high-performance TiO2-based composites. This work provides a new high-performance TiO2-carbon-based composite material for LIBs as well as a new valuable research strategy.

[Cytoplasmic estradiol and progesterone receptors in human endometrium with normal menstrual cycles: 116 cases].

PIP: Endomentrial samples were obtained from 116 patients who underwent hysterectomy or dilatation and currettage. The normal menstrual cycles were determined on the basis of clinical and histological features. They were divided into 6 categories: early, middle and late proliferative and secretory phases. The highest progesterone receptor level was present in the late profilerative phase and the lowest in the late secretory phase. Expect for the fact that the lowest level of estrogen receptor was present in the late secretory phase, differences in the other phases were not significant. The data was split into younger and older groups and analyzed separately. In the proliferative phase, the estrogen and progesterone receptor levels were higher in the perimenopausal group than in the premenopausal group, but no significant differences were found in the secretory phase. On the whole, the estrogen and progesterone receptor levels were higher in proliferative than in the secretory samples, and the progesterone receptor level was much higher than the estrogen receptor level in both phases. These findings were in agreement with data from the literature. Simultaneously, the estradiol and progesterone levels in serum and cytosol were measured in some cases. The progesterone receptor level was closely correlated with progesterone level in serum and tissues (negative correlation) and also closely correlated with estradiol in tissues (positive correlation). The variations in the estrogen and progesterone receptors in endometrial cytosol during the normal menstrual cycle of Chinese women may offer some useful information for further basic or clinical research in the fields of planned parenthood and gynecology. (author's modified)^ieng