In Situ High-Precision Measurement of Deep-Sea Dissolved Methane by Quartz-Enhanced Photoacoustic and Light-Induced Thermoelastic Spectroscopy.

Rapid and accurate realization of in situ analysis of deep-sea dissolved gases imperative to the study of ecological geology, oil and gas resource exploration, and global climate change. Herein, we report for the first time the deep-sea dissolved methane (CH) in situ sensor based on quartz-enhanced photoacoustic and light-induced thermoelastic spectroscopy. The developed sensor system has a volume of φ120 mm × 430 mm and a power consumption of 7.

Peripheral nerve injury associated with JEV infection in high endemic regions, 2016-2020: a multicenter retrospective study in China.

Previously, we reported a cohort of Japanese encephalitis (JE) patients with Guillain-Barré syndrome. However, the evidence linking Japanese encephalitis virus (JEV) infection and peripheral nerve injury (PNI) remains limited, especially the epidemiology, clinical presentation, diagnosis, treatment, and outcome significantly differ from traditional JE. We performed a retrospective and multicenter study of 1626 patients with JE recorded in the surveillance system of the Chinese Center for Disease Control and Prevention, spanning the years 2016-2020.

Point mutations of homologs as an adaptive solution to the gene loss.

Gene loss is common and influences genome evolution trajectories. Multiple adaptive strategies to compensate for gene loss have been observed, including copy number gain of paralogous genes and mutations in genes of the same pathway. By using the Ubl-specific protease 2 (ULP2) eviction model, we identify compensatory mutations in the homologous gene ULP1 by laboratory evolution and find that these mutations are capable of rescuing defects caused by the loss of ULP2.

Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers.

We developed a cavity ringdown spectrometer by utilizing a step-scanning and dithering method for matching laser wavelengths to optical resonances of an optical cavity. Our approach is capable of working with two and more lasers for quasi-simultaneous measurements of multiple gas species. The developed system was tested with two lasers operating around 1654 nm and 1658 nm for spectral detections of CH and its isotope CH in air, respectively.

Comparative population genomics reveals the domestication history of the peach, Prunus persica, and human influences on perennial fruit crops.

Background: Recently, many studies utilizing next generation sequencing have investigated plant evolution and domestication in annual crops. Peach, Prunus persica, is a typical perennial fruit crop that has ornamental and edible varieties. Unlike other fruit crops, cultivated peach includes a large number of phenotypes but few polymorphisms.

[Effects of low nitrogen stress on source-sink characters and grain-filling traits of different genotypes summer maize].

This paper studied the source-sink characters and grain-filling traits of six genotype summer maize varieties under 2 years (from 2007 to 2008) application of low dosage (105 kg x hm(-2)) and normal dosage (337.5 kg x hm(-2)) fertilizer nitrogen. Under low nitrogen stress, the population yield, leaf area index (LAI), source-sink characters, and grain-filling traits of test varieties differed significantly.

Cancer incidence and mortality of children in urban districts of Guangzhou between 2000 and 2004.

Background And Objective: Cancer is one of the most primary causes of death for children. The study was to analyze the cancer incidence and mortality of children in urban districts of Guangzhou between 2000 and 2004, to explore the incidence regularity of pediatric cancers and to provide a reference for prevention and treatment of pediatric cancers.

Methods: The data of cancer incidence and mortality of children during 2000-2004 were collected from Guangzhou Population-based Cancer Registry, and were calculated and analyzed.

[Incidence of colorectal cancer in Guangzhou City from 2000 to 2002].

Background And Objective: The incidence of colorectal cancer is increasing with the change of the diet habit. This study was to analyze the incidence of colorectal cancer in Guangzhou City, thus to provide references and information for the prevention and treatment of this disease.

Methods: Data of colorectal cancer patients during 2000-2002 were collected from Guangzhou population-based cancer registry.

[Cancer incidence and mortality in Guangzhou City from 2000 to 2002].

Background & Objective: Population-based cancer registration has never been carried out before in Guangzhou. This study was to analyze the cancer incidence and mortality in Guangzhou and to provide references for prevention and treatment of cancer.

Methods: Data of cancer incidence and mortality during 2000--2002 were collected from Guangzhou Population-based Cancer Registry.

[Effects of planting date and density on population physiological indices of summer corn (Zea mays L.) in central Shaanxi irrigation area].

By using D-saturation optimum design and the methods of crop population physiology, this paper studied the effects of planting date and density on the population physiological indices of summer maize Shandan 8806 and its yield in central Shaanxi irrigation area. The results showed that in the period from 13 June to 22 July, the delay of planting had negative effects on grain yield, dry matter accumulation (DMA), maximum leaf area index (LAImax), net assimilation rate (NAR), leaf area duration (LAD) and crop growth rate (CGR), with larger effects on LAD and CGR than on LAImax and NAR. Within the range of 45 000-65 918 plants .

[Population physiological indices on density-tolerance of maize in different plant type].

Taken maize in two plant types of compact-type and flat-type as research object, the relationships between density-tolerance and light distribution in population, indices of productivity(LAI, NAR, and CGR), and population sink-source were studied synthetically by means of crop growth analysis method. The results showed that light distribution in population was the chief index to measure density-tolerance of different maize varieties. The kinetic rules of LAI, NAR, and CGR were the basic feature reflecting density-tolerance.