Isolating cDNA clones from rice induced by Magnaporthe grisea using PCR based differential screening method

The differential hybridization technique hasbeen widely used to identify genes that are dif-ferentially expressed.However,this approachhas several drawbacks.First,the screeningprocedures are rather labor-intensive and time-consuming.Second,the amount of phageDNAs transferred onto the two filters may notbe equivalent,which leads to an inaccurate se-lection of a positive clone.Third,isolation ofphage DNA is slow and cumbersome.Here,aPCR based differential screening method that

Impact of a colorectal cancer screening program implantation on delays and prognosis of non-screening detected colorectal cancer

BACKGROUND The implementation of a colorectal cancer(CRC)screening programme may increase the awareness of Primary Care Physicians,reduce the diagnostic delay in CRC detected outside the scope of the screening programme and thus improve prognosis.AIM To determine the effect of implementation of a CRC screening programme on diagnostic delays and prognosis of CRC detected outside the scope of a screening programme.METHODS We performed a retrospective intervention study with a pre-post design.We identified 322 patients with incident and confirmed CRC in the pre-implantation cohort(June 2014–May 2015)and 285 in the post-implantation cohort(June 2017-May 2018)in the Cancer Registry detected outside the scope of a CRC screening programme.In each patient we calculated the different healthcare diagnostics delays:global,primary and secondary healthcare,referral and colonoscopyrelated delays.In addition,we collected the initial healthcare that evaluated the patient,the home location(urban/rural),and the CRC stage at diagnosis.We determined the two-year survival and we performed a multivariate proportional hazard regression analysis to determine the variables associated with survival.RESULTS We did not detect any differences in the patient or CRC baseline-related variables.A total of 20.1%of patients was detected with metastatic disease.There was a significant increase in direct referral to colonoscopy from primary healthcare(25.5%,35.8%;P=0.04)in the post-implantation cohort.Diagnostic delay was reduced by 24 d(106.64±148.84 days,82.84±109.31 d;P=0.02)due to the reduction in secondary healthcare delay(46.01±111.65 d;29.20±60.83 d;P=0.02).However,we did not find any differences in CRC stage at diagnosis or in two-year survival(70.3%;P=0.9).Variables independently associated with twoyear risk of death were age(Hazard Ratio-HR:1.06,95%CI:1.04-1.07),CRC stage(II HR:2.17,95%CI:1.07-4.40;III HR:3.07,95%CI:1.56-6.08;IV HR:19.22,95%CI:9.86-37.44;unknown HR:9.24,95%CI:4.27-19.99),initial healthcare consultation(secondary HR:2.93,95%CI:1.01-8.55;emergency department HR:2.06,95%CI:0.67-6.34),hospitalization during the diagnostic process(HR:1.67,95%CI:1.17-2.38)and urban residence(HR:1.44,95%CI:1.06-1.98).CONCLUSION Although implementation of a CRC screening programme can reduce diagnostic delays for CRC detected in symptomatic patients,this has no effect on CRC stage or survival.

360° light field 3D display system based on a triplet lenses array and holographic functional screen

A 360° light field 3D display system is presented, which consists of a liquid crystal display, a novel triplet lenses array, and a holographic functional screen （HFS）. The mapping relationship among pixels, 3D objects, and view- ing positions are investigated. The aberration analysis of the single lens is carried out both in the simulation and the experiment, which shows that it cannot provide an excellent 3D image to the viewers. In order to suppress the aberrations, ＂the primary aberration theory＂ and ＂the damped least-squares method＂ are used for optical analysis and lens design. A 3D image with aberration correction can be viewed around the proposed display system.