The Executive Committee of the National Economic Council (ECNEC) holds meeting on Tuesday. Photo: UNBBangladesh is going to construct ‘border roads’ in hilly areas along the India-Myanmar border with a view to ensuring better security through improved road communications.The Executive Committee of the National Economic Council (ECNEC) on Tuesday approved a project titled ‘Construction of Border Roads’ involving over Tk 16.99 billion to this end, reports UNB.ECNEC chairperson and prime minister Sheikh Hasina chaired the meeting held at the NEC conference room in Dhaka.While briefing reporters after the meeting, planning minister AHM Mustafa Kamal said the road and highways department and the special works organisation of Bangladesh army have been given the responsibility to implement the project.The project will be completed in six upazilas of Khagrachhari, Bandarban, Rangamati and Cox’s Bazar districts by June 2021.The project will be implemented at Naikhongchhari upazila in Bandarban, Juraichhari, Borkol and Rajstali upazilas of Rangamati, Ukhiaupazila of Cox’s Bazar and Baghaichhari upazila of Khagrachhari.Out of the proposed 317-kilometre roads, some 40 kilometres will be constructed on the Ukhia-Ashartoli-Fooltuli route, 52 kilometres on the Sajek-Shildah-Betling, 95 kilometres on Sajek-Dokanghat-Thegamukh, and 130 kilometres on Thegamukh-Loitongpara-Thachhi-Dumdumia-Rajsthali route.Bangladesh has around 540 kilometres borders — 330 kilometres with India and 210 kilometres with Myanmar.On implementation of the project, border guards are expected to be able to ensure strict measures in hilly border areas, curb illegal drugs and arms smuggling through improved road communications.This project will also help expand trade and commerce, develop tourism facilities in hilly areas, facilitate marketing of agricultural products to boost economic activities and generate employment opportunities.The planning minister said 16 projects were approved today with an overall estimated cost of more than Tk 96.80 billion.Of the approved 16 projects, 12 are new while four are revised ones.
The idea behind near-field microscopy is to offer a technique by which extremely small structures (at the nanometer level) can be measured and manipulated. However, 20 nanometers has been the best resolution accomplished. Until now. “We were able to resolve molecules when they were only 15 nanometers apart,” Stephen Quake tells PhysOrg.com. Quake and his group at the California Institute of Technology in Pasadena have created a fluorescence near-field microscope that can distinguish single molecules. The results are published in an article titled “Fluorescence Near-Field Microscopy of DNA at Sub-10 nm Resolution” in Physical Review Letters.“Conventional light microscopes use lenses, and so their imaging properties are limited by the properties of these lenses,” Quake explains. “The main limitation is the wavelength of light. But for the last 20 years, near-field microscopy has provided ways to look at objects without being limited by the wavelength of light. For the most part, that has meant two to four times better than the diffraction limit.”Along with Ziyang Ma, Jordan Gerton and Lawrence Wade, Quake designed and built a microscope that worked with fluorescence near-field microscopy (ANSOM — apertureless near-field scanning optical microscope). In their Letter, the authors describe how fluorescence fluctuations and the limited number of photons available before the molecule is destroyed has created problems in imaging fluorescent molecules. However, thanks to a new phase filtering method, Quake’s group demonstrates how this new kind of microscope can be useful for any number of applications, but especially for biomolecules like DNA.In fact, Quake and his collaborators used DNA to test their microscope. “One of the most stringent tests for a microscope is to put two items together and see how close you can get them and still tell them apart.” He points out that in near-field microscopy this test is not often done. “But we wanted rigorous evidence that the resolution is as high as we claim.” Quake feels that this new kind of microscope could be valuable if commercially produced. “If a commercial manufacturer picked these up and got them into labs, it could greatly advance the frontiers of both biology and nanoscience. They could be used as tools to learn more about the function of macromolecules.”According to the Letter, the microscope’s phase filtering method can also be applied to such things a nanoantennas and supersharp carbon nanotube probes. The resolution of both of these instruments could be improved with the group’s process. Additionally, the microscope could be altered to work on a level that approaches the resolution of an electron microscope.Quake predicts that there will be more to this new fluorescence near-field microscope. “So far, we only have results from molecules in air,” he says. “The next step is to make it work in water, and we have been modifying the instrument for that purpose.” The advantages to having such a microscope are obvious. Right now, with an electron microscope (which has sharper resolution), biomolecules cannot be observed directly in their natural conditions. But this new microscope, if properly adapted, could change that. “We could image live cells, for example. Look at things in motion. Observe proteins that are on the cell surface membranes. This microscope offers a powerful new tool for imaging single molecules and nanostructures.”By Miranda Marquit, Copyright 2006 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Citation: ANSOM Microscope Achieves Sub 10nm Resolution (2007, January 18) retrieved 18 August 2019 from https://phys.org/news/2007-01-ansom-microscope-10nm-resolution.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.