792 research outputs found
A propos du frottement de roulement : Une controverse oubliée
No full textTabor David. A propos du frottement de roulement : Une controverse oubliée. In: Revue d'histoire des sciences et de leurs applications, tome 14, n°1, 1961. pp. 13-18
Antibacterial action of prodigiosin on Bacillus genus
No full textProdigiozin je rdeči pigment, ki sodi v skupino prodigininov. Zanimiv je, ker deluje protimikrobno, protiglivno, algicidno in proti praživalim. Odkrili so tudi, da ima prodigiozin velik potencial kot protirakasta in imunosupresivna molekula. Protimikrobni mehanizem delovanja prodigiozina je slabo poznan, zato smo v magistrskem delu želeli določiti tarčne celične komponente bakterije B. subtilis, na katere deluje prodigiozin in pri tem povzroči celično smrt. Z dilucijsko metodo v mikrotitrskih ploščah smo različnim sevom Bacillus sp. določili MIK. MIK prodigiozina smo določili tudi bakterijam pri spremembi temperature inkubacije in slanosti v gojišču. Protibakterijsko aktivnost smo določali z merjenjem OD650 bakterijskih kultur v tekočem gojišču LB, kjer smo ob različnih fazah rasti kulturam dodali ustrezno koncentracijo prodigiozina. Hkrati smo celice spremljali tudi z uporabo mikroskopije z diferencialnim interferenčnim kontrastom in merjenjem aktivnosti β – galaktozidaze. V kontrolnih poskusih smo B. subtilis PS-216 tretirali z različnimi bakterolitičnimi in bakteriostatskimi sredstvi. Ugotovili smo, da so bili vsi testirani sevi Bacillus občutljivi na dodatek prodigiozina. Vrednosti MIK so bile različne in so znašale od 2,82 ± 1,81 mg/L pri Bacillus sp. 5A do 7,83 ± 2,86 mg/L pri B. subtilis NCIB 3610. V stresnih pogojih se je občutljivost bakterij na prodigiozin še povečala. Z opazovanjem celic pod mikroskopom in spremljanjem OD650 smo ugotovili, da prodigiozin povzroči avtolizo celic. Največji vpliv ima na hitro deleče se celice v eksponentni fazi rasti. Pokazali smo, da delovanje prodigiozina povzroči večjo prepustnost celične membrane. Iz dobljenih rezultatov sklepamo, da prodigiozin najverjetneje inducira avtolizine, ki povzročijo hitro lizo bakterijske populacije.Prodigiosin is a natural red pigment from a family of prodiginins. It is interesting because of its antibacterial, antifungal, algicidal and antiprotozoal activity. In addition, the anticancer and immunosuppressive properties of prodigiosin were described. The mechanism of prodigiosin\u27s antibacterial action is still unknown. The aim of the study was to determine cellular target components which prodigiosin affects and causes bacterial cell lysis. Minimal inhibitory concentration (MIC) of Bacillus sp. was evaluated by using broth dilution method in microtiter plates. MIC was also evaluated at different incubation temperatures and different medium salinity. The antibacterial activity was evaluated with measuring optical density of bacterial strains in the LB medium at 650 nm, where prodigiosin was added at different cell growth phases. For cell viability evaluation differential interference contrast microscopy was used and cytoplasmic membrane leakage was determined by measuring β – galactosidase activity. As a control, B. subtilis PS-216 was treated with different bacteriolytic and bacteriostatic agents. We have demonstrated, that all tested Bacillus strains are susceptible to prodigiosin. MIC value was between 2,82 ± 1,81 mg/L against Bacillus sp. 5A and 7,83 ± 2,86 mg/L against B. subtilis NCIB 3610. Exposure of bacterial strains to stress caused by temperature fluctuation and NaCl concentraton increased susceptibility to prodigiosin. Microscopy and optical density data indicate that prodigiosin causes celly lysis. The highest impact of prodigiosin was observed on actively dividing cells in the exponental growth phase. We have observed that prodigiosin increases permeability of cytoplasmic membrane. Based on our results, we have proposed that prodigiosin induces autolysins, leading to fast autolysis of bacterial culture
Quantifying the major sinks and sources of phosphorus in Tabor Lake: implications for management and remediation
No full textA study of Tabor Lake and its watershed during the open water season of 1995 was conducted in order to quantify the major sinks and sources of phosphorus, and the timing of phosphorus transfer between these sources and sinks. The results of this thesis are useful to help determine appropriate management strategies aimed at reducing phosphorus availability in Tabor Lake's water column and understanding some of the processes that control phosphorus availability in the lake. An exploratory modeling exercise was undertaken to evaluate morphometric and watershed variables in predicting spring phosphorus for 39 lakes in the region, including Tabor Lake. Two multiple linear regression models were constructed. The first model uses a stepwise technique to select statistically significant variables, and the second model uses variables found in the literature which have been shown to influence phosphorus loading. These two models account for 70% and 59% of the variation in spring phosphorus, respectively, and may provide managers with an expected phosphorus loading based on easily measured morphometric and watershed variables. The models predict that Tabor Lake should have a spring phosphorus concentration of 20 and 18 ug/L, respectively. The models are useful to establish the limits of water quality improvement for Tabor Lake. Another model was developed to estimate the quantity and timing of external sinks and sources of phosphorus in Tabor Lake for 1995. Phosphorus loading into Tabor Lake was estimated from runoff (136 kg) and atmospheric deposition (60 kg). Phosphorus output from Tabor Lake through the outlet creek was estimated at 188 kg for the entire year. Based on this input-output model, there was a net gain of 8 kg phosphorus into Tabor Lake during 1995. These results indicate that external phosphorus inputs and output is approximately balanced. Results from a prior monitoring program indicate that Tabor Lake experienced internal loading of phosphorus during periods of hypolimnetic anoxia. However, phosphorus loading also occurred when oxygen was present in the hypolimnion, suggesting another phosphorus loading mechanism was active in Tabor Lake. A specific effort was made to evaluate the role of senescing macrophytes (primarily Elodea canadensis) as a source of this phosphorus during the 1995 sampling season. Two experiments were conducted, one invitro and the other in-situ, to estimate phosphorus leaching from senescing macrophytes. The first in-vitro experiment used weeds collected August 8, 1995 and show that 87% (S.E.= 6%) of the total plant phosphorus is leached from these macrophytes, whereas the second in-vitro experiment, using samples collected September 22, 1995, show that only 9% (S.E.= 1%) of the phosphorus is leached from macrophytes. The difference between the two leaching estimates is believed to be the result of overwintering development and expected starch accumulation in the September samples. The in-situ study provided the best prediction of phosphorus leaching from senescing macrophytes, estimating 1958 kg of phosphorus (S.E.= 867 kg) was released from senescing macrophytes in 1995. The results from both the input-output model and the internal loading estimates show that Tabor Lake is dominated by the internal cycling of nutrients beginning in June and continuing until September. Furthermore, it quantifies two important phosphorus sources and the timing of phosphorus delivery from these sources. The quantification and timing of phosphorus delivery in Tabor Lake is useful to managers establishing remediation strategies which try to reduce the total phosphorus present in the water column. This research also shows that mechanical harvesting of macrophytes removes more phosphorus from the lake than exits through the outlet and can be useful in reducing the total phosphorus available to internal loading cycles in Tabor Lake.The original print copy of this thesis may be available here: http://wizard.unbc.ca/record=b118088
Webster, Pauline (Martin) Tabor, 1905-1992 (SC 2009)
No full textFinding aid and scan (Click on Additional Files below) for Manuscripts Small Collection 2009. Letter from Pauline Tabor Webster to David Helm, Bowling Green, Kentucky, postmarked 25 March 1991, with color photograph of Webster taken Christmas 1990. The letter refers to the upcoming birthdays of Webster and her sister, and compliments Helm\u27s mother
Paul and Jesus: How the Apostle Transformed Christianity
No full textHistorians know almost nothing about the two decades following the crucifixion of Jesus when his followers regrouped and began to spread his message. During this time, the apostle Paul joined the movement and began to preach to the Gentiles. Using the oldest Christian documents that we have -- the letters of Paul -- as well as other early Christian sources, historian and scholar James Tabor reconstructs the origins of Christianity. Tabor reveals that the familiar figures of James, Peter, and Paul sometimes disagreed fiercely over everything from the meaning of Jesus\u27 message to the question of whether converts must first become Jews. The author shows how Paul separated himself from Peter and James to introduce his own version of Christianity, which would continue to develop independently of the message that Jesus, James, and Peter preached.https://digitalcommons.pepperdine.edu/alumni_books/1129/thumbnail.jp
A Listing of Inventories and Purchases of Flutes, Recorders, Flageolets, and Tabor Pipes, 1388-1630
No full textA listing of entries relating to flutes, recorders, flageolets, and tabor pipes in inventories and records of purchases; with English translation
Assessing Oregon's local news & information ecosystem 2022
No full textRegina Lawrence, Courtney Tabor, Michelle Nicolosi, and Andrew DeVigal.Title from PDF cover (viewed on November 2, 2022)."A 2022 Agora Journalism Center report."This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Reflections on and Extensions of the Fuller and Tabor Theory of Rough Surface Adhesion
No full text© 2017, The Author(s). The classical Fuller and Tabor theory of rough surface adhesion is reviewed, and its limited applicability noted. New results using an extension of the JKR adhesion theory to include the effect of van der Waals adhesion forces are described. These show the influence of the Tabor parameter μ: moderate values of µ (µ<100) lead to increased forces during loading, and so are found to predict much lower hysteresis losses. A further extension is to replace the GW surface roughness model used by Fuller and Tabor by a model based on the Nayak model of a surface as a random field, as in the Bush, Gibson and Thomas (BGT) theory of non-adhesive contact. The results are qualitatively the same, and the differences may well be largely due to the necessary redefinition of the adhesion index using the rms profile curvature in place of the asperity radius of curvature used in the GW model
Byzantine Philosophy: Transfiguration of Man in the Tabor Light Doctrine of Gregory Palamas
No full textThe anthropological issues of philosophy of the late period Byzantium are under consideration in the article. The particular attention is paid to the substantiation of the Tabor Light conception of Gregory Palamas, a founder of Byzantine Hesychasm. Palamas' Uncreated Light (Tabor) doctrine is submitted concerning his teaching on God's energies and his understanding of the human being. The author shows the essential change of the Human being in connection with his perception of the Divine Light, i.e., the transfiguration of Man by the Light. Some provisions of Hesychasm connected with religious gnosis and the possibilities of the human mind in the knowledge of the Godhead are considered
- …
