Reliving the Columbine Shooting - 1764 Words

â€Å"BOOM† glass goes flying in the parking lot in every direction, at 11:19 AM the first bomb is detonated and is also heard within the halls of Columbine. The adrenaline in Dylan Klebold and Eric Harriss vein begins but so does the nightmare. Its April 20, 1999 an ordinary Tuesday morning at columbine high school. In about two weeks approximately 300 seniors will be graduating and perhaps attending college. For many students this means that they will be moving to a different chapter in their lives, and the beginning of a new life and life journey however for many students these goals wont be accomplished. On this particular Tuesday morning several students’ lives will unfortunately end in tragedy. Students today will head about their day as usual but two seniors, Dylan Klebold and Eric Harris will be very vengeful and will not allow anything to get in their path. Their highly anticipated nightmare to which they refer to as a dream will come to a reality and end with the lives of 12 students and 1 teacher. How far will two bullied teenagers seeking for revenge go? Well just enough to end their own lives. As the first lunch period begins students rush in, the lunchroom will be seating about 500 students and also those who will decide to eat outside since columbine has open campus lunch. Many students will also head to different classrooms to get work done or study, such ideal place like the library, where most of the fatalities took place. While everyone is busy taking testsShow MoreRelatedMisconceptions of Media Violence Essay1201 Words   |  5 Pagesdoes not always work, but have I killed or raped anyone? I understand that everyone takes it in differently, but it is a proven fact that teen aggression is usually derived from their peers. Look at the Columbine massacre, the suspect teens testified that their peers harrassed them because they were different, and retaliated out of hate and aggression. Both feelings that existed before any cops and robbers movie wer ever made, yet the news media quickly

Effect of rice and rye straw Free Essays

string(90) " milliliter of trial solutions was transferred into five glass civilization tubings \( c\." Abstraction Purposes: To analyze the suppression of the growing of Microcystis aeruginosa by different-term infusions of rice straw ( 0.2, 10, 50 and 100 yearss ) and rye straw ( 0.2, 5, 15, 40, 50, 100 and 150 yearss ) . We will write a custom essay sample on Effect of rice and rye straw or any similar topic only for you Order Now Methods and Consequences: All infusions with high concentration indicated repressive consequence on the growing of M. aeruginosa, and the 0.2-day infusion from rice straw and the 40-day infusion from rye straw indicated the most effectual 1s with EC50 values of 28.0 milligrams C l-1 and 18.9 milligrams C l-1, severally. The extract concentration of rice straw had negative relationship with the maximal growing and growing rate regardless decay continuance, whereas rye straw showed the negative relationship between the extract concentration and the lone maximal growing of M. aeruginosa. Features of infusions through extremist violet optical density should be changed due to debasement of straws. Decisions: Rice and rye straw infusion showed the possibility to command the growing of M. aeruginosa, and nevertheless, might be considered as an facet of another unexpected potency pollutant. Significance and Impact of the Survey: To place most effectual agent against algal growing, extracts from long-run debasement of straws could give more opportunity and possibility to happen allelochemicals. Keywords: long-run infusion, allelopathy, suppression, rice straw, rye straw, SUVA, Microcystis aeruginosa Introduction Tellurian workss have been known to incorporate assorted allelochemicals with anti-algal belongingss ( Rice, 1984 ) . For illustration, barley straw studied comparatively more than other straws like rice and rye has been reported to demo an suppression consequence of algal growing ( Pillinger et al. , 1992 ; Newman and Barrett, 1993 ; Barrett, 1994 ; Everall and Lees, 1996 ; Barrett et al. , 1996 ; Everall and Lees, 1997 ; Cooper et al. , 1997 ) due to assorted compounds extracted from barley straw under many different conditions, for case, oxidized phenolic compounds from lignin beginnings ( Pillinger, 1993 ; Chesson et al. , 1982 ) , p-coumaric and ferulic from cell wall-bound constituents ( Chesson et al. , 1982 ) , and tannic acid ( Hussein, 1982 ) . Rice straw has besides been known to let go of allelochemicals with phenolic compound to restrict the sprouting, growing, photosynthesis, respiration and metamorphosis of other workss ( Rice 1984 ; Inderjit et Al. 1995 ; Chung et Al. 2001 ) . Park et Al ( 2006 ) showed interactive and repressive consequence of assorted phenolic compounds extracted from rice straw on the growing of Microcystis aeruginosa. These straw-derived compounds may dwell of legion complex chemicals with assorted features in an aqueous status. As straws would be applied into aquatic ecosystems to command detrimentally algal growing, straw-derived chemicals would be excreted continuously, accumulated or changed into H2O column and features of chemicals would be changed harmonizing to the debasement clip which might be linked with the lability of chemicals. However, there was small information on this relationship between allelochemical production and debasement clip about rice and rye straws. Therefore, our purposes were to analyze whether released chemical from rice and rye straws harmonizing to decomposition clip has different suppression consequence on the growing of cyanobacterium, Microcystis aeruginosa, known as nuisance algae around the universe, and to foretell the alteration of features of extracted stuffs during decomposition clip. Materials and methods Collection of works stuffs Rye straw ( Secale cereale L. ) was collected in Keumsan, South Korea. Rice straw ( Oryza sativa L. ) which was non applied with pesticides to analyze insect pathology was obtained from Kangwon Province Agricultural Research and Extension Service, South Korea. All stuffs were instantly moved to research lab, rinsed several times with tap H2O, dried at 50? for 3 yearss and stored in a dark status at room temperature. Stored workss were cut, mortared, and sieved through 1-mm mesh before experiment. Preparation of short or long-run decomposed infusions Nine gms of each works stuff ( dry weight ) were placed in a 2 L Erlenmeyer flask, incorporating 1.8 L of Moss medium. The composing of Moss medium was ( in milligram ) 16.8 Ca2+ , 5.0 – 10-4 Co2- , 3.0 EDTA, 2.0 – 10-2 Fe3+ , 2.2 K+ , 2.4 Mg2+ , 2.0 – 10-2 Mn2+ , 4.0 – 10-3 Mo6+ , 13.6 Na+ , 6.4 NH4+ , 21.0 NO3- , 0.9 P5+ , 3.3 S6+ , 4.9 Si4+ , 5.0 – 10-3 Zn2+ , 3.3 – 10-8 Cyanocobalamin ( B12 ) , 3.3 – 10-7 d-Biotin, 3.3 – 10-8 Thiamin-HCl ( B1 ) in 1 L of distilled H2O. To break up straws for a long clip, an aerator provided aerophilic status into the 2 L Erlenmeyer flask because maintaining aerophilic status was of import for the production of phytotoxic chemicals. For illustration, Welch et Al. ( 1990 ) indicated that microbic decomposition of barley straw was critical for the suppression of algal growing, and Newman and Barrett ( 1994 ) suggested that the chief demands for straw to be active are the care of aerophilic cond itions and an active and diverse microflora. Humidifier prior to the aerator was installed to forestall the loss of infusions and civilization medium from the vaporization by blow uping dry air. The infusions from rice straw were sampled after 0.2, 10, 50 and 100 yearss from puting straws in the civilization medium and those of rye straw were obtained after 0.2, 5, 15, 40, 50, 100 and 150 yearss from presenting straws. Each subsampling, 200 milliliter of infusions were filtered through a glass fibre filter paper ( Whatman, GF/F ) , and so filtrate was lyophilized and stored in a icebox until Microcystis aeruginosa growing trial. Culture medium including infusions was made by fade outing 20 milligram of lyophilised stuff in 100 milliliter of sterilized Moss medium and filtered through a glass fibre filter paper ( Whatman, GF/F ) . Then, to quantitatively look into the suppression of M. aeruginosa growing by infusions, civilization medium including infusions was diluted with sterilized Moss medium to a scope of concentration of infusions ( test solution ) . Tested concentrations of infusions each decomposition period of straws were in Table 1. The concentrations of dissolved o rganic C ( DOC ) in infusions were determined utilizing the TOC analyser ( TOC-5000A, Shimadzu ) . Each 10 milliliter of civilization medium was stored at 4? to mensurate UV 260nm optical density. Culture status and growing finding of M. aeruginosa Each 4 milliliter of trial solutions was transferred into five glass civilization tubings ( c. You read "Effect of rice and rye straw" in category "Essay examples"a. 11 milliliter, USA Scientific Culture Tube ) with a cap and so, autoclaved. After 1-day chilling, each 0.3 milliliter of M. aeruginosa ( obtained from Institute of Hydrobiology, China ) was inoculated into four tubings and cultured. Remained one civilization tubing was used to mensurate clean value of fluorescence or optical density to observe algal growing each infusion. M. aeruginosa in exponential or stationary growing phase was inoculated for the experiments. Culture tubings were incubated in 25 ±1? and illuminated by fluorescent visible radiations to give about 80? E m-2 s-1 for 24 h every twenty-four hours. Tubes were agitated with a whirl sociable twice a twenty-four hours. The places of experimental tubings in an brooder were randomized at least four times a hebdomad. In vivo fluorescence of M. aeruginosa was m easured with 1 or 2 yearss interval utilizing a spectrofluorophotometer ( RF-1501, Shimadzu ) at 343 nanometer of an excitement wavelength and 680 nanometer of an emanation wavelength. Absorbance ( 680 nm ) of algal cells to mensurate algal growing was determined with 1 or 2 yearss interval utilizing a spectrophotometer ( 101, Hitachi ) alternatively of fluorescence after 50-day infusion of rice straw and 100-day infusion of rye straw. Determination of M. aeruginosa growing and statistics techniques To cipher maximal growing ( K ) and growing rate ( u ) of M. aeruginosa, a logistic map was used to show a sigmoid curve for algal growing ( SigmaPlot 9.0, Jandel Scientific ) as follows: EC50 values ( concentration, when 50 % suppression consequence occurs ) were obtained from maximal growing values of each trial compared with control on log-probit graduated tables. A consecutive line linking the two closest values above and below the line matching to 50 % suppression was obtained ( Yamane et al. , 1984 ) . In instance of 50 and 100 yearss in rice straw and 0.2 twenty-four hours in rye straw, EC50 values were calculated by the extrapolation of two closest informations of less than 50 % suppression. To cipher â€Å" no-inhibition upper limit tested concentration † , referred as a maximal concentration shown no-inhibition out of tried concentrations, repeated measured analysis of discrepancy ( ANOVA ) with station hoc of Dunnett trial was used ( p gt ; 0.05 ) to compare the distribution of optical density or fluorescence for observing M. aeruginosa growing between control without infusion and trial solutions. One-way ANOVA ( station hoc Duncan trial ) was utili zed ( p A ; lt ; 0.05 ) to compare normalized maximal growing or normalized growing rate among three groups of dissolved organic concentration ( DOC ) of infusions, and normalized maximal growing or normalized growing rate are calculated by divided maximal growing or growing rate in trial solution by in control, severally. Ratio of UV260 and DOC in infusions In order to foretell the alteration of features of infusions during decaying, the ratio of UV optical density at 260 nanometers and DOC concentration ( SUVA ; specific extremist violet optical density ) was measured. The UV optical density and DOC were measured by a spectrophotometer ( UV-2401PC, Shimadzu ) and TOC analyser ( TOC-5000A, Shimadzu ) , severally. Consequences Consequence of infusions of rice and rye straws on M. aeruginosa growing harmonizing to decomposition continuance Effectss of infusions from rice and rye straws harmonizing to decay periods on M. aeruginosa growing were in Table 1. In rice straw, 0.2-day decay infusions showed the highest suppression consequence of the growing of M. aeruginosa among four different decomposition periods and the EC50 value was 28.0 mg C l-1. The infusion of 10-day decay was followed with EC50 value of 30.7 milligrams C l-1. In 50-day and 100-day of decomposition, repressive effects were much less than those in 0.2- and 10-day infusions, and stimulus effects were shown in the scope of less than 23 mg C l-1. Although each period has different concentration of infusions, when no-inhibition maximal concentration was considered in all decomposition periods, 0.2-day and 10-day decay with A ; lt ; 9 and A ; lt ; 2 milligram C l-1, severally, could bespeak higher inhibitory possible to command the growing of M. aeruginosa than 50-day and 100-day decay with 23 and 17 milligrams C l-1, severally. Likewise, growing per cen tum against control at maximal concentration each decay period showed similar form in malice of otherwise maximal concentrations. Overall, repressive ability was mostly increased in scope of more than approximately 30 milligrams C l-1 in all decay periods ( Figure 1 ) . In rye straw, suppression capableness from 0.2-day decay to 40-day decay increased harmonizing to decay clip through decreasing of EC50 values ( Table 1 ) . Although suppression ability was diminished from 50-day decay infusion, suppression of M. aeruginosa growing increased until 150-day decay. Infusions of 40- and 150-day decay of rye straw had the highest repression capableness with 18.9 and 19.7 milligrams C l-1 of EC50 value, severally. Stimulus or repressive effects on the growing of M. aeruginosa coexisted in similar concentration of infusions from different decomposition clip ( Figure 1 ) . This phenomenon might give equivocal information to construe the repressive consequence by infusions from assorted decay phases. However, it was clear to demo positive relationships between extract concentration and repressive consequence, and perchance to bespeak that different substances from straws might be produced harmonizing to decay periods. Consequence of extract concentrations on the maximal growing and growing rate of M. aeruginosa Percentage of maximal growing ( K ) and growing rate ( u ) of M. aeruginosa in each trial solution normalized by K and u in control was shown in Fig. 2, and three groups were differentiated by merely DOC concentration of infusions irrespective of decay periods ; low ( 2-10 milligram C l-1 ) , medium ( 11-30 milligram C l-1 ) , and high ( gt ; 30 milligram C l-1 ) DOC. In rice straw, means (  ± SE ) of normalized K and U of M. aeruginosa were 102.5 (  ± 4.9 ) and 96.9 (  ± 2.9 ) in low DOC and 95.0 (  ± 11.1 ) and 102.1 (  ± 5.1 ) in medium DOC, severally, and there was no important difference in K ( p=0.655 ) and u ( p=0.710 ) between low and medium DOC ( one-way ANOVA, n=13 ) . However, agencies (  ± SE ) of normalized K and U in high DOC were 20.4 (  ± 18.5 ) and 43.4 (  ± 21.9 ) , severally, and infusions in high DOC might incorporate strong suppression ability against both maximal growing and growing rate of M. aeruginosa. In rye straw, there was important difference in K among three degrees ( one-way ANOVA, F2,25=22.386, P A ; lt ; 0.001, station hoc Duncan, n=26, P A ; lt ; 0.005 ) , but no important difference in U among three degrees ( one-way ANOVA, F2,25=0.664, p=0.524 ) . This rye infusion showed repressive consequence on maximal growing but non on growing rate. Means (  ± SE ) of normalized K and u were 106.3 (  ± 6.8 ) and 101.4 (  ± 5.5 ) in low DOC, 67.3 (  ± 8.8 ) and 111.5 (  ± 7.9 ) in medium DOC, and 33.9 (  ± 8.5 ) and 89.9 (  ± 20.6 ) in high DOC, severally. Change of features of infusions harmonizing to decomposition clip SUVA values versus decay periods each infusion were shown in Fig. 3. Those SUVA values were increased harmonizing to decay periods in both straws. It might propose that features of infusion were altering during decomposition of straws, and both infusion could hold different stuffs. Slopes between decay clip and SUVA in rice and rye straw were 0.017 ( R2=0.63, P gt ; 0.05 ) and 0.019 ( R2=0.93, P A ; lt ; 0.01 ) , severally. Discussion This probe of time-course decomposition in rice and rye straws demonstrated that suppression capacity of infusions on the growing of M. aeruginosa increased with high concentration, whereas low concentration showed no-effect or stimulation for its growing in all decay periods. In rye straw, all infusions after 5-day decay showed higher suppression ( lower EC50 values ) than 0.2-day decay ( Table 1, Fig. 1 ) . Particularly, infusion of 150-day decay along with 40-day had maximal suppressive consequence, and this consequence was similar to the survey of Gibson et Al. ( 1990 ) utilizing barley straw, which indicated that the repressive consequence was produced increasingly during the decomposition of the barley straw and reached a maximal after six months. However, the survey utilizing rice straw showed different forms, where the leachates of short-run decay were more effectual than that of long-run decay although limited factors for comparative experiment between rye and rice straw wer e existed such as deficit of decay continuance and narrow concentration scope of rice straw. The growing of M. aeruginosa in a bioassay experiment would be inhibited due to the chelation of food by the leachates or straw-secreted antialgal bioactive compounds. The former ground might be ruled out, because there were ample foods and hint elements for the growing of M. aeruginosa in the civilization medium and the stimulation of algal growing in lower concentrations of leachates could non be explained by chelation mechanism. Similarly, one of indispensable growing factors, such as vitamin B12, would be more likely to be produced by straw microflora so removed from solution ( Welch et al. , 1990 ) . For the latter ground, several surveies demonstrated that algal growing inhibited by straw-secreted antialgal substances was associated with the straw decomposition ( Gibson et al. , 1990 ; Pillinger et al. , 1994 ; Ridge and Pillinger, 1996 ) . Ridge and Barrett ( 1992 ) showed that the st raw was active even at low concentrations against a scope of algae in natural Waterss including unicellular and filiform green algae and blue-green algae. The difference of lignin content between rye and rice straws could be contributed into different forms of algal suppression when considered that lignin content of rye straw was much more treble than that of rice straw ( lignin content: 21 % in rye straw from Kocheva et al. , 2008 and 7 % in rice straw from Sun et al. , 2000 ) , although we did n’t analyse lignin contents of our tried straws. Pillinger et Al. ( 1995 ) showed that lignin-enriched brown-rotted wood is repressive to both Chlorella and Microcystis to a greater extent than lignin-depleted white-rotted wood. As decomposition status in this survey, oxidization of straw may ease lignin solubilization and/or enhance toxicity of the solubilized materal ( Pillinger et al. , 1994 ) . Besides, lignin appears to be the most promising beginning of compounds like the methox yphenols ( Ridge et al. , 1995 ) . Methoxyphenols every bit good as quinones, used theoretical accounts for oxidised phenolic compounds, have shown antialgal activity against Microcystis ( Pillinger et al. , 1994 ) . Other phytotoxic compounds such as ferulic, p-coumaric, vanillic, and p-hydroxybenzoic acids were found both in cold-water infusions of the straw of barley, rye, wheat, and in alcoholic infusions of their roots ( Borner, 1960 ) , and in rice straw ( Rice 1984 ; Inderjit et Al. 1995 ; Chung et Al. 2001 ) . The ground demoing otherwise repressive activity during straw debasement would probably be due to the continuum of production, the accretion of stubborn fraction and the chemical transmutation from assorted allelochemicals. As an application of an algae-growth inhibitor, adopted straws would undergo aging, decease, and decomposition in aquatic ecosystem. Under these conditions, plant-induced allelochemicals may be excreted or degraded continuously, be piled up into H2O columns, and besides contribute to the pool of organic affair in the aquatic ecosystem. These plant-derived allelochemicals contribute the formation of humic substances. SUVA can give information about the extent of aromacity of DOM related with humification. Increase of inclines between SUVA and decay periods in tried straws might ensue from the formation of stuffs such as humic substances harmonizing to decay periods and the gradual increasing of fractious fraction instead than labile one ( Fig. 2 ) . Chemical constr uction of straw infusions can be changed during biological and chemical decomposition, i.e. , labile fractions might be much more easy degraded than stubborn 1s ( Fig. 2 ) . For illustration, SUVA, an index of aromatic C content, has been shown to be negatively correlated with biodegradable DOC ( Kalbitz et al. , 2003 ) . However, qualitative designation and each specific consequence on the algal growing from decayed infusions remain to be studied. Although specific chemicals may be needed to be identified for the ecologically and environmentally safe options of Restoration, interactive consequence by combination of several chemicals might be considered ( Park et al. , 2006 ) . Short-run extraction from straws might lose out the opportunity to happen much better option, since this survey showed that infusions were chemically changed due to debasement and changed infusions showed different ability to suppress both maximal growing and growing rate of M. aeruginosa. Conversely, the sig nificantly algicidal chemical might be missed from infusions of low concentration demoing stimulus consequence on M. aeruginosa growing in this survey. Particularly, notable would be the observation to demo the different form about the suppression of maximal growing and growing rate between rice and rye straw infusions ( Fig. 2 ) , and nevertheless, these physiological features might be remained to be elucidated. Although all tested workss showed the suppression of algal growing in this survey, before works leachates incorporating allelochemicals are applied to command algal growing, the addition of the organic affair by leachates in the lakes or reservoirs demands to be considered. The importance of the control of organic affair is beyond difference in the H2O quality direction and research lab consequences should be extrapolated to the field with cautiousness. Decision All extracts with high concentration expressed by DOC showed repressive consequence on the growing of M. aeruginosa, and the 40-day infusion from rye straw indicated most effectual 1 with the lowest EC50 value of 18.9 mgC l-1. It was found that the extract concentration of rice straw had negative relationship with the maximal growing and growing rate, whereas rye straw showed negative relationship between the extract concentration and the lone maximal growing of M. aeruginosa. Through UV optical density, features of infusions should be changed due to debasement of straws, and this alteration might be linked with their repressive ability on the growing of M. aeruginosa. However, increasing DOC as unexpected pollutants every bit good as extrapolation of research lab plants into field status should be considered anterior to using infusions from straws as an option for Restoration technique. Mentions Barrett, P.R.F. , 1994. Field and laboratory experiments on the effects of barley straw on algae. 1994 BCPC monograph No.59: comparison greenhouse A ; field pesticide public presentation II pp.191-200. Barrett, P.R.F. , Curnow, J.C. , Littlejohn, J.W. , 1996. The control of diatom and cyanophyte blooms in reservoirs utilizing barley straw. Hydrobiologia 340, 307-311. Borner, H. , 1960. Liberation of organic substances from higher workss and their function in the dirt illness job. Bot. Rev. 26, 393-424. Chesson, A. , Stewart, C.S. , Wallace, R.J. , 1982. Influence of works phenolic acids on growing and cellulolytic activity of first stomachs bacteriums. Appl. Environ. Microbiol. 44, 597-603. Chung, I.M. , Ahn, J.K. and Yun, S.J. ( 2001 ) Appraisal of allelopathic potency of barnyard grass ( Echinochloa crus-galli ) on rice ( Oryza sativa L. ) cultivars. Crop Prot 20, 921-928. Cooper, J.A, Pillinger, J.M. , Ridge, I. , 1997. Barley straw inhibits growing of some aquatic saprolegniaceous Fungis. Aquaculture 156, 157-163. Everall, N.C. , Lees, D.R. , 1996. The usage of barley-straw to command general and bluish green algal growing in a Derbyshire reservoir. Wat. Res. 30, 269-276. Everall, N.C. , Lees, D.R. , 1997. The designation and significance of chemicals released from break uping barley straw during reservoir algal control. Wat. Res. 31, 614-620. Gibson, M.T. , Welch, I.M. , Barrett, P.R.F. , Ridge, I. , 1990. Barley straw as an inhibitor of algal growing II: research lab surveies. Journal of Applied Phycology 2, 241-248. Hussein, A.S.M. , 1982. Algicidal belongingss of Acacia nilotica. Fitoterapia 53, 175-177. Inderjit, K.M.M. Dakshini, and F.A. Einhellig ( explosive detection systems ) , 1995. Allelopathy: Organisms, Processes, and Applications. ACS Symposium Series 582. Washington, DC: American Chemical Society. Kalbitz K, Schmerwitz J, Schwesig D, Matzner E ( 2003a ) . Biodegradation of soil-derived dissolved organic affair as related to its belongingss. Geoderma 113:273-291 L.S. Kocheva, A.P. Karmanov, M.V. Mironov, V.A. Belyi, V.Yu. Belyaev, Yu.B. Monakov, 2008. Straw Lignins: Hydrodynamic and Conformational Properties of the Macromolecules. Russian Journal of Applied Chemistry, 81 ( 11 ) : 2033-2039. Newman, J.R. , Barrett, P.R.F. , 1993. Control of Microcystis aeruginosa by break uping barley straw. J. Aquat. Plant Manage. 31, 203-206. Park, M.H. , Han, M.S. , Ahn, C.Y. , Kim H.S. , Yoon, B.D. and Oh, H.M. 2006. Growth suppression of bloom – forming cyanobacterium Microcystis aeruginosa by rice straw infusion, Letters in Applied Microbiology 43: 307-312. Pillinger, J.M. , Gilmour, I. , Ridge, I. , 1995. Comparison of anti-algal activity of brown-rotted and white-rotted wood and in situ analysis of lignin. J. Chem. Ecol. 24, 1113-1120. Pillinger, J.M, Cooper, J.A. , Ridge, I. , 1994. Role of phenolic compounds in the antialgal activity of barley straw. J. Chem. Ecol. 20, 1557-1569. Pillinger, J.M. , 1993. Algal control by barley straw. Ph D Thesis, Department of Biology, The Open University, Milton Heynes. U.K. cited in ‘The control of diatom and cyanophyte blooms in reservoirs utilizing barley straw. Barrett, P.R.F. , Curnow, J.C. , Littlejohn, J.W. , 1996. Hydrobiologia 340, 307-311. ‘ Pillinger, J.M. , Cooper, J.A. , Ridge, I. , Barrett, P.R.F. , 1992. Barley straw as an inhibitor of algal growing III: the function of fungous decomposition. Journal of Applied Phycology 4, 353-355. Rice, E.L. , 1984. Allelopathy. Academic Press, London. p. 422. Ridge, I. , Pillinger, J.M. , 1996. Towards understanding the nature of algal inhibitors from barley straw. Hydrobiologia 340, 301-305. Ridge, I. , Barrett, P.R.F. , 1992. Algal control with barley straw. Aspects of Applied Biology 29, 457-462. Ridge, I. , J. Pillinger, and J. Walters, 1995. Relieving the jobs of inordinate algal growing. In The Ecological Basis for River Management. Wiley, Chichester. cited in ‘The designation and significance of chemicals released from break uping barley straw during reservoir algal control. Everall, N.C. and D.R. Lees, 1997. Wat. Res. 31 ( 3 ) :614-620. ‘ Sun, R. , J. Tomkinson, F.C. Mao and X.F. Sun, 2000. Physicochemical word picture of lignins from rice straw by H peroxide intervention. Journal of Applied Polymer Science 79 ( 4 ) : 710-732. Thurman, E.M. , 1985. Organic geochemistry of natural Waterss. Martinus Nijhoff/Dr W. Junk Publishers, Dordrecht, The Netherlands. p. 51. Welch, I.M. , P.R.F. Barrett, M.T. Gibson and I. Ridge, 1990. Barley straw as an inhibitor of algal growing I: surveies in the Chesterfield Canal. Journal of Applied Phycology 2: 231-239. Yamane, A.N. , M. Okada and R. Sudo, 1984. The growing suppression of planktonic algae due to wetting agents used in rinsing agents. Wat. Res. 18 ( 9 ) :1101-1105. How to cite Effect of rice and rye straw, Essay examples

Beethoven free essay sample

Ludwig van Beethoven Ludwig van Beethoven was baptized on December 17, 1770. Though the date of his birth is unknown, it is believed that he was born on December 16, 1770 which Is the day before his baptism. His parents were Johann van Beethoven and Marl Magdalene Seventh who lived In Bonn, Germany. Although they had seven children, only three boys survived including Ludwig who was the oldest. At an early age, Beethoven had an Interest In music. He was first taught music by his father.His father was aware of the success that Mozart had as a young child and also wanted his son Ludwig to be successful. He wanted his son make the family rich. Johann van Beethoven had young Ludwig practice for many hours. After long nights of drinking, Johann van Beethoven would sometimes drag his son out of bed to practice the piano or play for guests. Young Ludwig had his first public performance hen he was 7 years old. He constantly changes keys of that same melody as if he is trying his very best to hear them. That was what I concluded on the reason why he repeated the same melody with the same rhythm-? as if he was pondering which will sound better; for example at or at 2:40-?2:46, at first the quartet plays the notes (F-G-F-E-F-C) but as If Beethoven were not satisfied or wondered If he have not chose the notes right, he writes (F-G-F-E-F-D) right after. This tells me that I believe Beethoven was trying to experiment with Is melody.I also want to share that liked the parts (for example at 0:34 0:44) where the music builds tension by making a crescendo; soon after the tension relaxes by a quick decrescendo at the end of the phrase. Furthermore, I like the part at 4:19-?4:36 where the viola plays the melody line and violin also play the melody line right after and they keep on playing repeatedly as If they were having an agitated conversation until the violin plays the runs and the other Instrume nts Join soon after and all instruments crescendo together until the phrase ends.String Quartet Pop. 18 No. 6 in a-flat Major (2nd movement) The second movement Is always the slow tempo piece. I felt very calm and I heard harmonize and the connecting lines (or the legato lines) are the highlights of this particular piece. The violin takes the main melody from the beginning of the piece, and at 0:23, the viola slowly and gradually takes over and repeats the main melody and ends at 0:43.Furthermore, at 1:10, the violin plays the main melody again at a higher register but slightly more musical than how it was played in the beginning of the piece; this time the cello plays dotted note rhythms and the other violin and viola lays the long base lines with the violin to make it more interesting (ends TTL :30). Right after, there is a mood change and the tension grows when cello and violin plays the minor scale. However, as if Beethoven was not satisfied, they repeat the minor scale (viola) but it is played differently.I thought this part was interesting at 2:57; thieving tricks the audience by pr etending to finish a phrase but plays a different note to make the phrase hang in the air as if to make the audience hold their breath or feel agitated. At 2:57, the audience probably wanted to hear E flat-C)-C, but instead, Beethoven wrote E flat-D-E to create suspense in the air. After, the quartet continues to play the melodic line they were playing before the suspense.At 3:53, the violin plays the chromatic scale to lead to the main melody (at 4:02) that was played in the beginning of the piece. After this part, everything else sound similar from the beginning part of the recording. At 6:40, the performers decrescendo, and surprises the audience with a submit forte or fortissimo. The piece ends cutely with two pizzicato notes. Piano Sonata in d, Pop. 31 No. 2 (2nd movement) This Piano Sonata by Beethoven has a nickname called The Tempest which by definition means a violent commotion or disturbance-?like a bad storm.It does sound like that in the first movement. It does not, however, sound like a violent disturbance in the second movement. It is as if the storm in the first movement has settled and the sea has become quiet and is taking a break. The first chord that starts in the second movement shows calmness in the air-?like a sign of relief. In the beginning, the first few measures are the main melody theme that Beethoven will be using throughout this piece. The melody starts right after the first chord in the beginning (which is at 0:07).Again, Beethoven repeats the main theme again right after at 0:48 but with a turn-?which is a sign that tells the performer to play the note that is under to play a note step up, come back to its note, go down, and then get back to the notes again. Furthermore about this repeated melody, there Nerve more tension; the sounds were much stressed and had more feeling of agitation between the notes. I think I felt agitation between the notes was because hat the left hand notes were dissonances. Going along, at 1:26, the left had starts to play octaves notes which are triplets.And as the music continues, tension builds gradually with the left hands octaves become heavier and louder till the tension ends briefly with a right hand staccato run at 2:40. The left hand octaves come back as if the relaxed tension never existed before and tension builds again-?the tension is released again at 3:46 with the main mel ody theme come back. I want to mention hand of the part, there is a resolved part where the left hand plays E natural and hen F which gives Off resolved feeling.Right after that resolve in the left hand, I heard a surprise which were notes of thirds and fifths going down and sometimes an arpeggio appears here and there while the main melody theme plays (4:32-?5:07). Soon after this, the left hand octaves come back again-?which is the repetition from earlier section of this piece. From 8:00, I feel like he was making a very short summery of what had happened in this second movement. The piece ends with a single note of B flat from right hand and then left hand right after.