Study on Clinical Application of Different Ultrasound-Guided Planar Techniques in Minimally Invasive Percutaneous Nephrolithotomy

Objective. The objective is to explore the clinical application value of ultrasound long- and short-axis planar technology in real-time guided puncture in minimally invasive percutaneous nephrology. Methods. The clinical data of 80 patients undergoing real-time ultrasound-guided minimally invasive percutaneous nephrolithotomy from September 2018 to October 2019 were analyzed. The patients were randomly divided into 2 groups with different ultrasound-guided puncture techniques, long-axis in-plane technique and short-axis out-of-plane technique. Results. Minimally invasive percutaneous nephrolithotomies under real-time ultrasound guidance were successfully completed in both groups of patients. The success rate of the first puncture in the short-axis out-of-plane group was significantly higher than that in the long-axis in-plane group, and the differences were statistically significant ( P <.05); the total puncture time in the short-axis out-of-plane group was significantly less than the long-axis in-plane group, and the differences were statistical significance ( P <.05); there was no significant difference in the single-stage stone removal rate, total percutaneous renal channels, total hospital stay, and rate of complications by the Clavien classification between the 2 groups ( P > .05). Conclusion. Ultrasound long-axis and short-axis planar technologies can achieve good clinical application results in real-time guided puncture to establish percutaneous renal channels during minimally invasive percutaneous nephrolithotomy. Compared with the long-axis in-plane technique, the short-axis out-of-plane technique can shorten the puncture time and improve the success rate of the first puncture.

The Optimal Arthroscopic Release Plane of External Snapping Hip

Background: Some studies have reported arthroscopic release of external snapping hip(ESH). However, there is no research on the effect of different arthroscopic release plane for ESH. We will study the effect of release plane on arthroscopic surgery, and suggest an optimal release plane.Methods: From September 2017 to December 2018, 177 bilateral and 6 unilateral ESH patients who would receive arthroscopic release of ESH and agree to attend at this study were enrolled. One release plane was randomly offered for each operation hip out of 6 different arthroscopic release planes(referred to the apex of the great trochanter(GT), including planes of -2cm, 0cm, 2cm, 4cm, 6cm and 8cm groups). All patients received continuous follow-up, comparing preoperative and postoperative hip snapping, hip adduction and flexion angles and Harris Hip Scores(HHS). Results: There was no difference in age, gender, body mass index (BMI) and average operation time among different release plane groups (p>0.05). In terms of surgical success rate, the release plane group 4cm (98.33%)> 6cm (96.67%)> 2cm (95.00%)> 0cm (91.67%)> 8cm (8.33%)>-2cm (5.00%) (p<0.05). Although the hip adduction and flexion angles were improved in each group after operation (p<0.05), the improvement in the release plane -2cm and 8cm groups was significantly lower than that in the other four release plane groups (p<0.05). In addition, at 12 months of follow-up, all patients had significantly improved adduction and flexion angles and HHS (p<0.05). Conclusions: The arthroscopic release plane for ESH can affects the surgical effect, and the optimal arthroscopic release plane is 0-6 cm .

Utilizing plane group symmetry to favor noncentrosymmetry in three-dimensional crystals

Materials that lack inversion symmetry (noncentrosymmetric) demonstrate a diversity of desirable optical and electronic properties in bulk such as second harmonic generation, chiral emission, and piezo-, pyro-, and ferro-electricity. Unfortunately, it is challenging to reliably access noncentrosymmetric packing motifs because the closest packing of molecules is often achieved through inversion symmetry operators, leading to the relatively low occurrence of noncentrosymmetry in organic crystals. In this study, the occurrence of noncentrosymmetry in materials that adopt planar packing motifs is investigated because molecular species achieve closest packing in two dimensions through rotations and (or) glides, symmetry operators that do not individually lead to centrosymmetry. It is found that of the 18 crystal structures investigated here adopting planar packing motifs, 13 structures (72%) are noncentrosymmetric showing in-plane polarization. The 13 noncentrosymmetric crystal structures differ from the centrosymmetric structures by directional halogen bonding interactions or steric collisions that align the polarization directions of neighboring layers, leading to bulk structural polarity. The results from this investigation will be of use for designing noncentrosymmetric materials for application in optical and electronic devices.

Truncated octahedral LiNi0.5Mn1.5O4 with excellent electrochemical properties for lithium-ion batteries prepared by a graphite assisted calcination method

A high-performance truncated octahedron structured LiNi0.5Mn1.5O4 is synthesized by a graphite assisted calcination method, in which the {111} and {100} crystal plane group are meet the requirements of high ratio and long cycling performance.

Crystallographic patterns in Philippine indigenous textiles

The aim of this study was to analyze a representative sample of Philippine indigenous textiles in order to capture the range of symmetries and color symmetries present. This paper examines the existence of symmetries in finite designs, and classifies the plane-group and frieze-group symmetry types of the repeated patterns in woven textiles. The tendency of a particular symmetry to be more or less common than another can indicate relationships between the symmetries and the weaving technique or the culture that produced them. This paper will also examine designs and patterns with color symmetry found in these textiles. The sample consisted of 588 repeated patterns and finite designs in textiles (389 plane, 166 frieze and 33 finite) culled from well known museums in the Philippines, personal collections of scholars, existing literature on Philippine textiles and field visits.

The affine and Euclidean normalizers of the subperiodic groups

The affine and Euclidean normalizers of the subperiodic groups, the frieze groups, the rod groups and the layer groups, are derived and listed. For the layer groups, the special metrics used for plane-group Euclidean normalizers have been considered.

3D Reconstruction of Protein Kinase C Molecules From Electron Micrographs Of Two-Dimensional Crystals On Lipid Monolayers In Plane Group p1

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005