Search results for "MOE"
showing 10 items of 1101 documents
N-aizvietotu 2-aminomalonskābes monoesteru elektroķīmiska dekarboksilēšana iekšmolekulārā Hofera-Moesta reakcijā.
2021
N-Aizvietotu 2-aminomalonskābes monoesteru elektroķīmiska dekarboksilēšana iekšmolekulārā Hofera-Moesta reakcijā. Prāne K., Darba vadītāja MSc. chem. Koleda O. Bakalaura darbs ir uzrakstīts latviešu valodā, tā apjoms ir 50 lappuses. Darbs satur 16 attēlus, 10 tabulas, 39 literatūras avoti, 1 pielikums. Bakalaura darbā izstrādāta jauna elektroķīmiska N-aizvietotu 2-aminomalonskābes monoesteru dekarboksilēšanas metode, kurā notiek iekšmolekulāra ciklizācija. Izstrādātās reakcijas rezultātā iegūst otrajā pozīcijā ceturtējo oglekli saturošus tetrahidrofurānus un tetrahidropirānus. Iegūtie substrāti un produkti analizēti ar spektroskopijas metodēm.
Lokanu oglekļa nanocaurulīšu-metālu halkogenīdu hibrīdstruktūru sintēze un īpašības
2021
Darbā ir veikti pētījumi par lokanu oglekļa nanocaurulīšu tīklojumu, oglekļa nanocaurulīšu-metālu halkogenīdu hibrīdstruktūru un to nanokompozītu ar nevadošiem polimēriem termoelektrisko īpašību izmaiņām materiālu lieces iespaidā. Bakalaura darba ietvaros tika sagatavoti lokani oglekļa nanocaurulīšu tīklu un oglekļa nanocaurulīšu-antimona telurīda/ oglekļa nanocaurulīšu-bismuta selenīda hibrīdstruktūru paraugi ar dažādu hibrīdstruktūru sadalījumu parauga tilpumā, kā arī tie tika iemaisīti vai iekapsulēti nevadoša polimēra matricā. Tika pētīta šo paraugu termoelektrisko īpašību (pretestības un Zēbeka koeficienta) atkarība no to liekuma rādiusa, un analizēti iegūtie rezultāti. Šāda tipa parau…
Il Museo della Civiltà contadina di Montallegro
2009
Binding mode analysis of ABCA7 for the prediction of novel Alzheimer's disease therapeutics
2021
Graphical abstract
<title>Ion and electron trapping: release and relaxation processes in fluoride crystals</title>
2001
The thermally stimulated relaxation (TSR) processes in CaF2, BaF2 and LiBaF3 crystals (X-ray irradiated at LNT or RT) have been investigated by means of the ionic conductivity, thermally stimulated (TS) ionic depolarization current (TSDC), TS current (TSC), TS luminescence (TSL) and thermal bleaching techniques. The ionic TSDC measurements evidence that under DC field fluorides accumulate large ionic space-charge (thermoelectric state is formed) as a result of the migrating anion interstitial and/or vacancy capture on defects. In the ionic conductivity region (290 - 650 K) the thermoelectric state anneals, and several wide and overlapping anionic TSDC peaks are detected. The ionic TSDC stag…
Thermoelectric properties of CoTiSb based compounds
2009
Several CoTiSb based compounds were synthesized and investigated on their thermoelectric properties. The aim was to improve the thermoelectric properties of CoTiSb by the systematic substitution of atoms or the introduction of additional Co into the vacant sublattice. The solid solutions Co1+xTiSb, Co1?yCuyTiSb and CoTiSb1?zBiz were synthesized. X-ray diffraction was used to investigate the crystal structure. The resistivity, the Seebeck coefficient and the thermal conductivity were determined for all compounds in the temperature range from 2 to 400?K. The highest figure of merit for each solid solution is presented. We were able to improve the figure of merit by a factor of approximately s…
Chromoendoscopy with indigocarmine improves the detection of adenomatous and nonadenomatous lesions in the colon.
2001
BACKGROUND AND STUDY AIMS Depressed early cancers and flat adenomas have a high potential for malignancy with possible infiltrating growth, despite the small size of the lesion. Japanese investigators have shown that early diagnosis and classification of these lesions is possible with the help of chromoendoscopy. The aim of this study, therefore, was to evaluate the usefulness of chromoendoscopy during routine colonoscopy. PATIENTS AND METHODS During routine colonoscopy, vital staining with indigocarmine solution (0.4 %, 1 - 10 ml) was performed on all visible lesions in 100 consecutive patients without visible inflammatory changes. If findings on macroscopic examination were unremarkable, …
Perspectives of Chromo and Magnifying Endoscopy
2003
The goal of every routine endoscopy in the gut is the early diagnosis of malignant and premalignant changes of the mucosa. Chromo- and magnifying endoscopes are exciting new tools and offer detailed analysis of the colonic mucosal surface and pit pattern architecture. This review summarizes recent advances in endoscopic characterization of colorectal lesions using magnification endoscopy and chromoendoscopy. Surface analysis of the colon using chromoendoscopy allows a prediction between non-neoplastic and neoplastic lesions with high specificity. The precise delineation of the borders and a more detailed macroscopic analysis of the lesions are further advantages. In particular, flat adenoma…
The ‘Difficult’ Polyp: Pitfalls for Endoscopic Removal
2012
Adenomatous polyps are early neoplasias of colorectal cancer (adenoma-carcinoma sequence). The majority of adenomas or early invasive cancers (T1sm1) can be resected by endoscopy. Endoscopic resection techniques include classic loop polypectomy, endoscopic mucosectomy with preceding lifting of the (almost flat) lesion, endoscopic submucosal dissection and transanal microsurgical resection, an alternative to endoscopic submucosal dissection in the rectum. Endoscopic polyp removal should always aim to resect the lesion in ‘one piece’ and avoid, whenever possible, ‘piecemeal resection’. One-piece polypectomy is the basis for a precise histopathological analysis and for proving complete removal…
Chromo- and magnifying endoscopy for colorectal lesions
2005
It is essential to identify patients with premalignant or early malignant changes during colonoscopy. Thus, curative resection can be offered. At present, endoscopy can be performed with new powerful high-resolution or magnifying endoscopes. Comparably to the rapid development in chip technology, the optic features of the newly designed endoscopes offer resolutions which allow new mucosal surface details to be seen. In conjunction with chromoendoscopy, the newly discovered tool video endoscopy is much easier and more impressive than with conventional fibre optics. This review summarizes the value of magnifying endoscopy in the lower gastrointestinal tract and focuses on colorectal lesions.