Search results for "Pf"
showing 10 items of 526 documents
Pflanzengattungen der Livländische Flora
1840
Austrumbaltijas eksperts Karls Reinholds Kupfers
2022
Raksts par vācbaltu botāniķa Karla Reinholda Kupfera (1872-1935) dzīvi, Austrumbaltijas pētījumiem un citiem zinātniskajiem sasniegumiem.
Obesity and Outcomes in COVID-19: When an Epidemic and Pandemic Collide.
2020
Obesity has reached epidemic proportions in the United States and in much of the westernized world, contributing to considerable morbidity. Several of these obesity-related morbidities are associated with greater risk for death with coronavirus disease 2019 (COVID-19). Severe acute respiratory syndrome coronavirus 2 penetrates human cells through direct binding with angiotensin-converting enzyme 2 receptors on the cell surface. Angiotensin-converting enzyme 2 expression in adipose tissue is higher than that in lung tissue, which means that adipose tissue may be vulnerable to COVID-19 infection. Obese patients also have worse outcomes with COVID-19 infection, including respiratory failure, n…
Polyelectrolyte properties of filamentous biopolymers and their consequences in biological fluids.
2014
Anionic polyelectrolyte filaments are common in biological cells. DNA, RNA, the cytoskeletal filaments F-actin, microtubules, and intermediate filaments, and polysaccharides such as hyaluronan that form the pericellular matrix all have large net negative charge densities distributed over their surfaces. Several filamentous viruses with diameters and stiffnesses similar to those of cytoskeletal polymers also have similar negative charge densities. Extracellular protein filaments such collagen, fibrin and elastin, in contrast, have notably smaller charge densities and do not behave as highly charged polyelectrolytes in solution. This review summarizes data that demonstrate generic counterion-…
Kopfinansēšanas iespējas Baltijas Valstīs
2022
Bakalaura darba tēma: Kopfinansēšanas iespējas Baltijas valstīs. Kopfinansēšana tiek uzskatīta par alternatīvu tradicionālajiem finansējuma veidiem. Ar kopfinansēšanas palīdzību fiziskām un juridiskām personām ir iespējams piesaistīt finansējumu, lai realizētu inovatīvas idejas un produktus, finansētu dažādus dzīves apstākļus, kā arī kopfinansēšana ļauj jauni izveidotiem uzņēmumiem piesaistīt pašu kapitālu. Bakalaura darba mērķis: ir izpētīt kopfinansēšanas iespējas Baltijas valstīs, veikt secinājumus un izstrādāt priekšlikumus kopfinansēšanas platformu darbības uzlabošanai. Darbs sastāv no trīs daļām – teorētiskajā daļā tiek apskatīti kopfinansēšanas teorētiskie aspekti – kopfinansēšanas j…
NILLTPFN prasību izpildes bankās Latvijā iespējas izmantojot ārpakalpojumu, Swedbank AS situācijas izvērtējums
2021
Maģistra darba mērķis ir pamatojoties uz NILLTPFN likuma prasību īstenošanu banku praksē, analizēt un novērtēt Latvijas banku un padziļinātāk Swedbank AS sadarbību ar ārpakalpojumu sniedzējiem, izstrādāt priekšlikumus ārpakalpojuma piesaistes procesa uzlabošanā Swedbank AS un kopumā arī citām Latvijas bankām. Darbā pētīta NILLN prasību ietekme uz ārpakalpojuma piesaisti bankām Latvijā. NILLN pakalpojumu sniedzēju skaits ir ierobežots, ārpakalpojuma piesaiste nav vienkārša. Tēma ir aktuāla, jo bankas Latvijā ir saņēmušas ievērojamus administratīvos sodus par NILLN prasību pārkāpumiem, cieš reputācija. Augstākajās izglītības iestādēs Latvijā netiek piedāvāts apgūt padziļinātāk NILLN. Pētījumā…
Inhibitoren der Korrosion 30 (1,2) - Vergleichende Studien über das Verhalten bekannter und bisher unbekannter Inhibitoren der Korrosion des Kupfers …
1985
Folgende Verbindungen wurden auf ihre Fahigkeit zur Inhibierung der Korrosion von Kupferproben unter Standardbedingungen uberpruft: Benzotriazol (BTA), 5-Aminotetrazol-monohydrat (5-AT), 2,5-Diphenyl-3-(m-chlorphenyl)-tetrazolium-nitrat (Tetrazin-B), α- und β-Naphthylamin, Phenylthioharnstoff, Xanthanwasserstoff, 2-Mercaptothiazolin (2-MT) und Kupferron. Folgende Messungen wurden durchgefuhrt: Bestimmung der Geschwindigkeit der Sauerstoffaufnahme im Schuttelversuch und pH-statische Verfolgung des Korrosionsverlaufs in Abhangigkeit (a) von der Konzentration des Inhibitors, (b) dem Verteilungszustand der Kupferprobe (Korn, Staub, Blech), (c) der Anwesenheit von Cu2+-Ionen und (d) dem pH-Wert.…
Mining customer requirements from online reviews: A product improvement perspective
2016
We propose a filtering model to predict helpfulness of reviews for product design.We provide a way to use the KANO model based on online reviews.We explore how to obtain insights from Big Data through knowledge-based view. Big data commerce has become an e-commerce trend. Learning how to extract valuable and real time insights from big data to drive smarter and more profitable business decisions is a main task of big data commerce. Using online reviews as an example, manufacturers have come to value how to select helpful online reviews and what can be learned from online reviews for new product development. In this research, we first proposed an automatic filtering model to predict the help…
Coexistence of single-mode and multi-longitudinal mode emission in the ring laser model
2005
A homogeneously broadened unidirectonal ring laser can emit in several longitudinal modes for large enough pump and cavity length because of Rabi splitting induced gain. This is the so called Risken-Nummedal-Graham-Haken (RNGH) instability. We investigate numerically the properties of the multi-mode solution. We show that this solution can coexist with the single-mode one, and its stability domain can extend to pump values smaller than the critical pump of the RNGH instability. Morevoer, we show that the multi-mode solution for large pump values is affected by two different instabilities: a pitchfork bifurcation, which preserves phase-locking, and a Hopf bifurcation, which destroys it.
Murine liver antigen presenting cells control suppressor activity of CD4+CD25+ regulatory T cells.
2005
CD4(+)CD25(+) regulatory T cells (Treg) are important mediators of peripheral immune tolerance; however, whether Treg participate also in hepatic immune tolerance is not clear. Therefore, we tested the potential of Treg to suppress stimulation of CD4(+) T cells by liver sinusoidal endothelial cells (LSEC), Kupffer cells (KC), or hepatocytes. In the absence of Treg, all 3 types of liver cells could stimulate CD4(+) T cell proliferation; in the presence of Treg, however, CD4(+) T cell proliferation was suppressed. Interaction with KC even stimulated the expansion of the Treg population; LSEC or hepatocytes, in contrast, could not induce proliferation of Treg. Because liver inflammation can be…