Sökresultat

The calcitonin receptor (CTR) is relevant to three hormonal systems: amylin, calcitonin, and calcitonin gene-related peptide (CGRP). Receptors for amylin and calcitonin are targets for treating obesity, diabetes, and bone disorders. CGRP receptors represent a target for pain and migraine. Amylin receptors (AMY) are a heterodimer formed by the coexpression of CTR with receptor activity-modifying pr

Most small glaciers in the world have significantly decreased their volume during the last century, which has caused water shortage problems. Glacier No. 1, at the headwaters of the Urumqi River, Tianshan, China, has been monitored since 1959 and similarly has experienced significant mass and volume losses over the last few decades. Thus, we examined the trend and potential abrupt changes of the m

The ignition of nitromethane/O2/N2 mixtures was investigated via shock tube experiments in the temperature range 947–1333 K at reflected shock pressures near 8, 16 and 32 atm. The ignition was recorded as the intensity maxima of unfiltered luminosity in the range 240–530 nm. Under the experimental conditions of the present study, ignition was found to proceed via a two stage process. Dependencies

A new detailed kinetic mechanism for formaldehyde and methanol combustion has been developed using the Konnov mechanism, version 0.6, as a starting point. In total, 82 reactions of the formaldehyde and methanol subsets were reviewed and updated using a systematic approach. Rate constants were selected based on thorough evaluation of available experimental and theoretical data. No modifications of

FTIR smog chamber techniques were used to study the kinetics of the gas-phase reactions of Cl atoms, OD radicals, and O3 with the five-membered ring-structured compounds tetrahydrofuran (C4H8O, THF), 2-methyltetrahydrofuran (CH3C4H7O, 2-MTHF), 2,5-dimethyltetrahydrofuran ((CH3)2C4H5O, 2,5-DMTHF), and furan (C4H4O). The rate coefficients determined using relative rate methods were kTHF+Cl = (1.96 ±

In this article, gas-phase advanced oxidation, a new method for pollution control building on the photo-oxidation and particle formation chemistry occurring in the atmosphere, is introduced and characterized. The process uses ozone and UV-C light to produce in situ radicals to oxidize pollution, generating particles that are removed by a filter; ozone is removed using a MnO2 honeycomb catalyst. Th

The atmospheric chemistry of two C 4H 8O 2 isomers (methyl propionate and ethyl acetate) was investigated. With relative rate techniques in 980 mbar of air at 293 K the following rate constants were determined: k(C 2H 5C(O)OCH 3 + Cl) = (1.57 ± 0.23) × 10 -11, k(C 2H 5C(O) OCH 3 + OH) = (9.25 ± 1.27) × 10 -13, k(CH 3C(O)OC 2H 5 + Cl) = (1.76 ± 0.22) × 10 -11, and k(CH 3C(O)OC 2H 5 + OH) = (1.54 ±

The reaction CHCl3 + Cl → CCl3 + HCl was studied in the atmospherically relevant temperature range from 253 to 313 K and in 930 mbar of N2 diluent using the relative rate method. A temperature dependent reaction rate constant, valid in the temperature range 220-330 K, was determined by a fit to the result of the present study and that of Orlando (1999); k = (3.77 ± 0.32) × 10-12 exp((-1011 ± 24)/T

Översiktliga beräkningar visar att ca 2 miljoner människor utsätts för trafikbullernivåer överstigande de riktvärden som riksdagen ställt sig bakom. Ungefär 500 000 av dessa utsätts för buller från tågtrafiken. Trafikbuller har betydelse för vår hälsa och de negativa effekterna kan vara störning av dagliga aktiviteter, stress sömnsvårigheter, koncentrationsproblem och högt blodtryck. Detta arbete Roughly 2 million Swedish citizens are exposed to traffic noise from roads, railways and aircrafts at levels higher than those approved by the government. As many as 500 000 of these are subject to railway noise. Exposure to traffic noise can have negative effects and cause irritation and disturbance of daily activities and also create general health problems such as lack of sleep, stress, concent

Weichselisens avsmältningsskede i Skåne var mycket komplicerat, vilket har föranlett en stundtals svårtolkad glacialmorfologi. I de norra och centrala delarna av Skåne retirerade isen mot norr och nordost, samtidigt som södra Skåne och Danmark berördes av lobformade isframstötar från en baltisk isström från söder- och sydost. Sedan länge har forskning pågått för att finna lösningen på isens rörelsThe deglaciation of the Weichselian ice sheet was very complicated and the resulting landscape has been perplexing different researchers throughout the 20th century. In the northern parts of Scania, the ice sheet receded towards north and northeast, while a dynamic ice stream with fast flowing ice influenced southern Scania and Denmark. The earlier researchers have mainly focused on striae, the di

Gröna tak kan minska problem med s.k. urban heat islands och kan användas för dagvattenhantering. Andra miljöfördelar som en förbättring av luftkvalitet, biodiversitet och bullerminskning finns också. Detta projekt fokuserar på lokala (kommunala) medel för att skapa en bättre miljö med extensiva gröna tak, vilka är nästan underhållsfria. Ett delområde i Lund som inkluderar Universitetet och UniverGreen roofs have the potential to mitigate problems with an urban heat island and to act as an element in stormwater management. Other environmental benefits exist as well, such as improvement of air quality, biological diversity and noise reduction. This project focuses on local community efforts to create a better environment through the use of extensive green roofs, which require almost no main

Sammanfattning Under 1960-talet kunde vetenskapsmän konstatera att en generell uppvärmning av atmosfären resulterade i klimatförändringar. En av källorna till den globala uppvärmningen var och är fortfarande den höga koncentrationen av växthusgaser i atmosfären som uppstår genom mänsklig aktivitet vid förbränning av fossila bränslen. Trots den vetskapen dröjde det en bit in på 2000-talet innan kliSummary In the 1960’s scientists discovered that general heating of the atmosphere or global warming results in climate change. One of the reasons behind global warming is the high concentration of green house gases in the atmosphere, which is a bi-product of fossil fuel combustion caused by human activity. Climate change did not become a European Union priority before the 21st century when the c

China's surging OFDI has been a prominent phenomenon since the start of 20th century. As China's economic growth is widely received as following a unique path, a question arises immediately---does Chinese outward investment also follows a distinctive pattern which can only be explained by special theories? This paper analyzes the determinants of Chinese OFDI by adopting Random Effects FGLS

The spaghetti bowl of regional trade agreements has been growing rapidly the past two decades. While services trade has often been excluded from these agreements, the recent trend suggests that a shift has occurred and that policy-makers are paying more attention to services trade. As Canada and the European Union (EU) are negotiating a bilateral trade agreement, services sector inclusion is a maj