There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

Fast parallel algorithms for short-range molecular dynamics

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.

/pdf/electronics-and-optoelectronics-of-two-dimensional-2jbqr1unvw.pdf

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

Ovarian cancer (OC) has high mortality and morbidity. Circular RNA (circRNA) can deeply impact the tumor occurrence and growth. The pathogenic activity of one particular circRNA, hsa_circ_0001445 (hcR1445), in OC remains unclear and was therefore analyzed in this study.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/cam4.5317

Hsa_circ_0001445 works as a cancer suppressor via miR‐576‐5p/SFRP1 axis regulation in ovarian cancer

Two new Russula species, R. subbrevipes and R. callainomarginis, from China are described based on morphological and molecular characteristics. Russula subbrevipes has thus far only been found in southwestern China at altitudes of higher than 3400 m and is characterized by a yellow ochre pileal surface, glabrous or tomentose stipe, fruity odor, subglobose to ellipsoid basidiospores, isolated or partially connected warts and pleurocystidia with a cap appendage. Russula callainomarginis is characterized by a cream to white pileus, light turquoise lamellae margin, spongy stipe, light turquoise zone on the top of the stipe, pungent odor, globose to ellipsoid basidiospores and dominant isolated warts. The phylogenetic tree of Russula was constructed with multi-gene sequences, including the internal transcribed spacer regions (ITS), the ribosomal large subunit (nrLSU), the small subunit of the mitochondrial rRNA gene (mtSSU) and the second largest subunit of RNA polymerase II (RPB2). The results show that both R. subbrevipes and R. callainomarginis represent new lineages in Russula subg. Brevipes. Description and illustration of the two new species are presented.

/pdf/morphological-and-molecular-evidence-for-two-new-species-1o4brsqh.pdf

Morphological and Molecular Evidence for Two New Species within Russula Subgenus Brevipes from China

B4C has been widely used as a sintering aid for the densification of ZrB2-based ceramics by pressureless sintering. In this study, the effect of B4C on the sintering and ablation mechanism for PyC-Csf/ZrB2-SiC-ZrC ceramics are investigated. The results show that the addition of B4C improves sintering by removing oxide impurities from the grain surface, and inhibiting grain growth by pinning the grain-boundary movement as second phase particles. The structure of PyC-Csf/ZrB2-SiC-ZrC ceramics remained intact after ablation at 2000°C for 120 s. The mass ablation rate of sample #4 with 14% B4C (-9.17×10-4 g/s) is close to 0. A Zr-Si-O layer and ZrO2 layer are formed on the samples’ surface to prevent oxygen diffusion. 

Pressureless sintering and ablation behavior of PyC-Csf/ZrB2-SiC-ZrC ceramics doped with B4C

Constructing Reduced Porous Graphene Oxide for Tailoring Mass-Transfer Channels in Ultrathin Mxene (Ti3c2t X ) Membranes for Efficient Dye/Salt Separation

Mingwei Chen

Papers

Hsa_circ_0001445 works as a cancer suppressor via miR‐576‐5p/SFRP1 axis regulation in ovarian cancer

Morphological and Molecular Evidence for Two New Species within Russula Subgenus Brevipes from China

Pressureless sintering and ablation behavior of PyC-Csf/ZrB2-SiC-ZrC ceramics doped with B4C

Constructing Reduced Porous Graphene Oxide for Tailoring Mass-Transfer Channels in Ultrathin Mxene (Ti3c2t X ) Membranes for Efficient Dye/Salt Separation

Pd-based transition-metal-doped binary nano-porous material and preparation method thereof