Anlässlich eines richterlichen Gutachtenauftrages zur Frage, ob das Tragen von Mund-Nase-Schutzmasken zu einer Verfälschung des Atemalkoholmesswertes zuungunsten des Angeklagten führen kann, erfolgte unter Pandemiebedingungen eine experimentelle Testreihe an 6 gesunden Proband*innen (4 Männer, 2 Frauen), die risikoarmen Freizeitalkoholkonsum betrieben. Pro Untersuchungstag wurde jeweils ein Maskentyp (Op.-Maske, Textilmaske, FFP2-Maske) untersucht. Nach Aufnahme einer individuell berechneten Menge Alkohol und einer 30-minütigen Resorptionsphase erfolgten in halbstündigen Abständen 6 aufeinanderfolgende Atemalkoholmessungen, wobei zwischen den Messungen jeweils im Wechsel eine der Masken oder keine Maske getragen wurde. Anschließend wurden Wertepaare für Zeiträume mit und ohne Maske gebildet und die stündlichen Atemalkoholabbauraten berechnet. Im Ergebnis unterschieden sich die Atemalkoholabbauraten mit und ohne Masken nicht voneinander. Fehlermeldungen durch das Atemalkoholmessgerät, die auf das vorherige Tragen einer Maske zurückzuführen sind, traten nicht auf.

Der Begriff Maskerade unterscheidet sich trotz etymologischen Verwandschaft vom Begriff Maske. Unter Maskerade werden vor allem Strategien der Inszenierung von Geschlechtsidentitäten verstanden, weshalb synonymisch häufig von Geschlechtermaskerade die Rede ist. Das Konzept hat in den Theater-, Film- und Literaturwissenschaften sowie in der Philosophie und der Psychologie Einzug gehalten. In den Gender Studies etablierte sich der Begriff in den 1990er Jahren, maßgeblich beeinflusst durch psychoanalytische und poststrukturalistische Theoriebildung. Mit der Maskerade können sehr verschiedene Phänomene bezeichnet werden, von der Pseudonymität weiblicher Autor_innenschaft bis hin zu alltagskultureller Performance und Körperinszenierung, etwa im Transvestitismus.

<p>UVOD: Anestezija je povezana sa promenama ventilacije, koje počinju sa prvim datim lekom, a mogu da traju i danima posle hirur&scaron;ke intervencije. Hipoksemija je najočiglednija posledica ove promene. U anesteziolo&scaron;koj praksi i perioperativnom tretmanu bolesnika kiseonička terapija zauzima značajno mesto. Jo&scaron; uvek ne postoje jasne, na dokazima zasnovane, smernice za upotrebu kiseoničke terapije u postoperativnom periodu. Razlog verovatno leži u činjenici da veliki broj faktora može da utiče na ishod lečenja hirur&scaron;kog bolesnika i zato je te&scaron;ko ispitati njihove pojedinačne uticaje. Kiseonička terapija tretira ili prevenira nastanak hipoksije obezbeđujući inspiratornu koncentraciju kiseonika veću od iste u vazduhu. Kod najvećeg broja pacijenata u postoperativnom periodu ne postoji potreba za strogom kontrolom inspiratorne koncentracije kiseonika, a administracija kiseoničke terapije sprovodi se primenom uređaja niskog protoka i varijabilne performanse, kao &scaron;to su nazalna kanila i kiseonička maska za lice. Brojna istraživanja poslednjih decenija poku&scaron;ala su da daju odgovor na pitanja da li postoji stvarna razlika u primeni ova dva uređaja, posebno u svetlu razvoja hipoksemije u postoperativnom periodu. Prednosti primene nazalne kanile su bolje prihvatanje od strane bolesnika u poređenju sa maskom, obično zbog manje izraženog osećaja klaustrofobije pri upotrebi nazalne kanile. Nazalna kanila, ne zahteva uklanjanje prilikom nege usne duplje ili per os unosa &scaron;to obezbeđuje kontinuitet u isporuci kiseonika. Nedostaci nazalne kanile vezani su za otežanu primenu kod bolesnika sa nazogastričnom sondom ili otežanim disanjem na nos. Pri protocima većim od 4 litre u mnuti može izazvati nelagodnost na nosnoj sluznici bolesnika. Literaturni podaci, ukazuju da se primenom kiseoničke maske ipak postižu veće inspiratorne koncentracije kiseonika, te da se epizode desaturacije i hipoksemije znatno ređe javljaju. Međutim, postoje i istraživanja koja ukazuju na mogućnost ponovnog udisanja vazduha iz mrtvog prostora maske, pri nižim protocima &scaron;to može uticati na parcijalni pritisak ugljen-dioksida u arterijskoj krvi. CILJEVI: Ciljevi istraživanja su da se ispitata učestalost javljanja hipoksemije unutar 48 sati od ekstubacije kod bolesnika u jedinici intezivne terapije, zatima da se ispita pojava desaturacije, da se utvrditi učestalost potrebe za primenom neinvazivne mehaničke ventilacije pozitivnim pritiskom kod bolesnika u jedinici intezivne terapije kod kojih se primenjuje kiseonička terapija putem nazalne kanile, odnosno kiseoničke maske. Takođe, cilj je i da se ispita da li postoji povezanost preoperativnih karakteristika bolesnika sa eventualnim izborom jednog od dva uređaja za primenu kiseoničke terapije u ranom postoperativnom periodu. METODOLOGIJA: Na Klinici za anesteziju i intenzivnu terapiju Kliničkog centra Vojvodine sprovedeno je prospektivno istraživanje kojim je obuhvaćeno 160 pacijenata nakon elektivnih hrur&scaron;kih procedura, koji su nakon operativnog zahvata praćeni u jedinici intenzivne terapije. Pacijenti su randomizovani u dve grupe (grupa M &ndash; kiseonička maska i grupa N &ndash; nazalna kanila) u odnosu na uređaj kojim je sprovođena postoperativna kiseonička terapija. Za sve pacijente uključene u studiju evidentirana je pol, starost, telesna masa, telesna visina, izračunat indeks telesne mase. Evidentiran je i ASA status, kao i NYHA status. U istraživanje nisu uključeni pacijenti sa plućnim komorbiditetima. Iz istraživanja su isključeni svi oni bolesnici kod kojih je do&scaron;lo do respiratornih komplikacija u perioperativnom periodu, kao i onih kod kojih je bila prisutna hemodinamska nestabilnost. Postoperativno svi pacijenti su sedirani, na mehaničkoj ventilaciji sme&scaron;teni u jedinicu intenzivne terapije. Nakon prevođenja na spontano disanje i ekstubacije započinjana je primena kiseonika putem kiseoničke maske za lice (6 l/min) odnosno nazalne kanile (4 l/min). Sprovođen je kontinuirani monitoring vitalnih parametara, saturacije hemoglobina kiseonikom, kao i novo ugljen-dioksida na kraju ekspirijuma. Kod svih pacijenata u četiri vremena rađene su gasne analize arterijske krvi. Svi praćeni parametri poređeni su između dve ispitivane grupe pacijenata. Za statističku obradu podataka kori&scaron;ćen je programski paket Statistical Package for Social Sciences - SPSS 21. Numerička obeležja su prikazana putem srednjih vrednosti (aritmetička sredina) i mera varijabiliteta (opseg vrednosti, standardna devijacija), a atributivna obeležja kori&scaron;ćenjem frekvencija i procenata. Komparacija vrednosti numeričkih obeležja između dve grupe vr&scaron;ena je primenom Studentovog t- testa, odnosno neparametrijskog Mann- Whitney testa. Testiranje razlike frekvencija atributivnih obeležja vr&scaron;eno je primenom &chi;2 testa. U cilju ispitivanja povezanosti dva ili vi&scaron;e obeležja, odnosno generisanja adekvatnih statističkih modela, kori&scaron;ćena je multivarijantna regresiona analiza. Statistički značajnim se smatraju vrednosti nivoa značajnosti p&lt;0.05. REZULTATI: U odnosu na preoperativne karakteristike ispitivanih pacijenata nije nađena statistički značajna razlika u distribuciji pacijenata u dve ispitivane grupe u odnosu na pol (2 test; 2=0,378;p=0,539), starost (T test; t=1,958; p=0,053), APACHE II skor na prijemu (Mann-Whitney test; U=1220,500; p=0,837), indeks telesne mase (T test; t=1,380; p=0,171), pu&scaron;ačkim navikama (2 test; 2=0,644;p=0,422), vrednostima preoperativnog hemoglobina (T test; t=0,442; p=0,660), saturacije hemoglobina kiseonikom (T test; t=0,883; p=0,380). Razlike nije bilo ni u pogledu trajanja mehaničke ventilacije (Mann-Whitney test; U=1114,500; p=0,345). Hipoksemija (parcijalni pritisak kiseonika u arterijskoj krvi manji od 65 mmHg) nije registrovana ni kod jednog od pacijenata u obe ispitivane grupe. Vrednsti SpO2 &lt; 92%, registrovane su kod ukupno 24 pacijenta u svim analiziranim vremenima (24%). Najveći broj pacijenata kod kojih je registrovana niska vrednost detektovan je u prvom satu nakon ekstubacije kada je vrednost manja od 92% registrovana kod 5 pacijenata (5%) i to kod 3 pacijenta u grupi M (6%) i 2 pacijenta u grupi N (4%). Između vizita 2. i 3. vrednosti satutracije manje od 92% registrovana je kod 19 pacijenata (19%), kod 8 pacijenata u grupi M (16%) i kod 11 pacijenata u grupi N (22%). U periodu između vizita 3. i 4. vrednosti saturacije niže od 92% registrovane su kod 19 (19%) pacijenata i to kod 10 pacijenata u grupi M (20%) i kod 9 pacijenata u grupi N (18%). Statistički značajna razlika zabeležena je u sve tri vizite (vizita 2, 3, 4) u vrednosti parcijalnog pritiska kiseonika u arterijskoj krvi. Tako su pacijenti u grupi kod kojih je primenjivana maska imali statistički značajno veće vrednosti parcijalnog pritiska kiseonika. Istovremeno pacijenti kod kojih je kiseonička terapija primenjivana putem maske imali su značajno veće vrednosti saturacije hemoglobina kiseonikom i ova razlika je bila statistički značajna u svim posmatranim vizitama. U prvih 48 sati nakon operacije neinvazivna mehanička ventilacija primenjena je kod 80 pacijenata. Kod svih pacijenata indikacija za primenu je bila pojava desaturacije. U odnosu na distribuciju pacijenata po ispitivanim grupama nije bilo statistički značajne razlike u broju pacijenata koji su zahtevali neinvazivnu mehaničku ventilaciju (2 test; 2=2,250; p=0,134). Pacijenti u grupi N proveli su vi&scaron;e minuta (srednja vrednost 56,85 +/- 19,80 minuta) na neinvazivnoj ventilaciji od pacijenata u grupi M (srednja vrednost 33,14 +/- 10,65 minuta), a ova razlika je statistički značajna (T test; t=2,923; p=0,009). Na osnovu multivarijantne regresione analize, pacijenti koji su kiseoničku terapiju primali putem nazalne kanile, sa porastom indeksa telesne mase imali su niže vrednosti parcijalnog pritiska kiseonika u arterijskoj krvi (r2=0,392). ZAKLJUČCI: Kiseonička maska za lice i nazalna kanila obezbeđuju adekvatnu primenu kiseoničke terapije u smislu prevencije nastanka hipoksemije u ranom postoperativnom periodu. Primenom kiseoničke maske za lice ostvaruju se vi&scaron;e vrednosti parcijalnog pritiska kiseonika u arterijskoj krvi. Epizode desaturacije če&scaron;će se javljaju kod pacijenata kod kojih se u ranom postoperativnom periodu primenjuje kiseonička terapija putem nazalne kanile. Pacijenti kod kojih se primenjuje kiseonička terapija putem maske ostvaruju veće vrednosti saturacije hemoglobina kiseonikom. Pacijenti kod kojih je kiseonička terapija u ranom postoperativnom periodu primenjivana putem nazalne kanile zahtevali su dužu primenu neinvazivne mehaničke ventilacije pluća. Kod pacijenata sa većim vrednostima indeksa telesne mase, za primenu kiseoničke terapije u ranom postoperativnom periodu, kiseonička maska za lice će obezbediti bolju oksigenaciju.</p> / <p>INTRODUCTION: Anesthesiology is associated with vicissitudes in ventilation, which start with application of first medicine and last for days following surgical intervention. Hypoxemia is a most common side effect of vicissitudes in ventilation. Oxygen therapy is important in anesthesiology and post-operative treatment of a patient. There are no clear evidence-based guidelines for application of oxygen therapy in post-operative period. Numerous factors influence patient&rsquo;s treatment outcome and it is difficult to examine each factor&rsquo;s independent impact. Oxygen therapy treats or prevents occurrence of hypoxemia by providing inspiratory concentration of oxygen greater than the amount found in air. Most patients in post-operative period don&rsquo;t require vigilant control of inspiratory concentration of oxygen, and administration of oxygen therapy is implemented with a low flow device with variable performances such as nasal cannula and oxygen face mask. Various research attempts where made in the last decades to discover an evident difference between these two devices, especially in cases where hypoxemia occurred in post-operative period. One advantage to using nasal cannula over oxygen face mask is that its better perceived by a patient as it reduces feeling of claustrophobia. Nasal cannula doesn&rsquo;t need to be removed during oral cavity care or &ldquo;per os&rdquo; intake which ensures continuous oxygen delivery. The drawback to using nasal cannula is that its challenging to insert it in a patient with nasogastric tube or difficult nasal breathing. Also, patient can experience nasal discomfort if the oxygen flow is bigger than four litters per minute. Literature data shows that application of oxygen trough the face mask achieves greater inspiratory concentrations of oxygen, and reduces the occurrence of desaturation and hypoxemia. Still, there is research which points out to the possibility of breathing in from dead space in the mask, in lower flows, which can partially affect pressure of carbon dioxide in artery blood. AIM: Aim of the research is to examine frequency of hypoxemia and non-invasive mechanical ventilation in patients treated with oxygen therapy via nasal cannula or oxygen face mask during the first 48 hours following patient extubating in intensive care unit. Also, aim is to examine correlation between patients&rsquo; pre-operative characteristics and the choice of one of the two devices for oxygen therapy in early postoperative period. METHODOLOGY: Clinic for Anesthesiology and Intensive Therapy at the Clinical Center of Vojvodina conducted this research on 160 patients who underwent elective surgical procedures and received post-operative care in Intensive Care Unit. Patients were randomly assigned to two groups (Group M with oxygen face mask and Group N with nasal cannula) relative to device which was used for post-operative oxygen therapy. Information recorded for all the patients included in the study constituted their gender, age, weight, hight, and body max index. ASA status, as well as NYHA status were also recorded. Research excluded any patient who experienced respiratory complications in post-operative period as well as those who experienced hemodynamic instability. Postoperatively all patients were sedated and on mechanical ventilation therapy in intensive care unit. After transition to spontaneous breathing and extubating, oxygen therapy was applied using oxygen mask (6 l/min) or nasal cannula (4 l/min). Vital parameters were continuously monitored as well as hemoglobin oxygen saturation, and carbon dioxide at the end of the expirium. Gas analysis of artery blood was carried out four times for all participants in the study. All parameters were compared between two examined patient groups. Statistical analysis was carried out using Statistical Package for Social Sciences - SPSS 21. Numerical features are depicted using arithmetic mean and variability rate, and attributive features are depicted with frequency and percentages. Comparison of the values of numerical characteristics between the two groups was performed using Student&#39;s t-test, that is, a non-parametric Mann-Whitney test. The frequency difference in attributive characteristics was tested using &chi;2 test. To generate adequate statistical model, multivariate regression analysis was applied to examine the link between two or more of features. Significant values are determined if level of significance is p&lt;0.05. RESULTS: Preoperative characteristics of the patient showed no significant differences between the two study groups. Characteristics were recorded with respect to gender (2 test; 2 = 0.378; p = 0.539), age (t-test; t = 1,958, p = 0,053 ), APACHE II score on admission (Mann-Whitney test; U = 1220.500; p = 0.837), body mass index (t-test; t = 1.380, p = 0.171), smoking habits (2 test; 2 = 0.644; p = 0.422), the values of the preoperative hemoglobin (t-test; t = 0.442, p = 0.660), and hemoglobin oxygen saturation (t-test; t = 0.883, p = 0.380). Difference was discovered in regards to duration of mechanical ventilation (Mann-Whitney test; U = 1114.500; p = 0.345). Hypoxemia (partial oxygen pressure in the arterial blood of less than 65 mmHg) was not registered in any of the patients in both study groups. Value SpO2&lt; 92%, was registered in 24 patients during every round (24%). Patients who registered value lower than 92% experienced it in the first hour post extubation. This was observed in 5 patients in total (5%) where 3 patients from group M (6%) and 2 from group N (4%). Between 2nd and 3rd rounds, saturation values lower than 92% were recorded in 19 patients (19%): 8 from group M (16%) and 11 from group N (22%). In the period between the 3rd and 4th rounds the value of saturation lower than 92% was detected in 19 (19%) patients: 10 from group M (20%) and 9 from group N (18%). Statistically significant difference was noted in all three rounds (rounds 2, 3, 4) in the values of the partial oxygen pressure in arterial blood. Thus, patients from the group treated with an oxygen face mask had significantly higher values of partial oxygen pressure. In addition patients treated by oxygen face mask had significantly higher levels of oxygen saturated hemoglobin, and this difference was statistically significant in all observed rounds. In the first 48 hours after surgery noninvasive mechanical ventilation was performed in 80 patients. Common indication for oxygen therapy in all patients was desaturation. There were no statistically significant differences in the number of patients who required non-invasive mechanical ventilation in either of the groups (2 test; 2 = 2.250; p = 0.134). Patients in group N received several minutes more (mean value of 56.85 +/- 19.80 minutes) of the non-invasive ventilation than patients in the group M (mean value of 33.14 +/- 10.65 minutes), and this difference was statistically significant (t-test; t = 2,923, p = 0,009). Based on the multivariate regression analysis, the patients who received oxygen therapy via nasal cannula, with the increase in body mass index had lower values of partial oxygen pressure in arterial blood (r2 = 0.392). CONCLUSION: Both face mask and nasal cannula ensure adequate application of oxygen therapy to prevent hypoxemia in the early postoperative period. Oxygen face mask achieves higher value of partial oxygen pressure in arterial blood. Episodes of desaturation more frequently occur in patients who receive oxygen therapy with nasal cannula in early postoperative period. Patients who receive oxygen therapy via oxygen face mask achieve higher hemoglobin oxygen saturation values. Patients who undergo oxygen therapy in the early postoperative period using nasal cannula require longer application of non-invasive mechanical ventilation. Patients with higher body mass index receive better oxygenation in the early postoperative period if facial mask is the device of choice.</p>

In dieser Arbeit untersuchen wir die grundlegenden Wachstums- und Relaxationsprozesse, die es erlauben den Verzerrungszustand von GaN (0001) beim Wachstum auf Silizium (111) Substraten einzustellen und die resultierende Dichte an Durchstoßversetzungen zu reduzieren. Zu deren Analyse werden GaN (0001) Schichten, die mittels metallorganischer Gasphasenepitaxy abgeschieden worden sind, hauptsächlich mit transmissionselekronenmikroskopischen Methoden untersucht. Die wesentlichen Erkenntnisse der Arbeit sind: (i) Der Aufbau einer kompressiven Verzerrung von GaN (0001) Filmen mittels AlGaN Zwischenschichten beruht auf einer Asymmetrie der plastischen Relaxation an den beiden Grenzflächen der AlGaN Zwischenschicht. Fehlpassungsversetzungen bilden sich zwar an beiden Grenzflächen aus, jedoch ist der mittlere Abstand zwischen Versetzungslinien an der unteren Grenzfläche kleiner, als an der oberen. (ii) Plastische Relaxation von verzerrten (0001) Wurtzit Schichten erfolgt im Wesentlichen durch Bildung von a-Typ Fehlpassungsversetzungen im 1/3 |{0001} Gleitsystem. Diese bilden sich aber nur dann, wenn die verzerrten Schichten eine 3-D Morphologie aufweisen. Eine quantitative Modellierung dieses Prozesses zeigt, dass die kritische Schichtdicke für das Einsetzen der plastischen Relaxation wesentlich vom Wachstumsmodus bestimmt wird. (iii) Eine Silizium Delta-Dotierung der GaN (0001) Oberfläche führt zum Wachstum einer kohärenten Sub-Monolage SiGaN3, die eine periodisch Anordnung von Silizium- und Galliumatomen, sowie Galliumvakanzen aufweist. Da das Wachstum von GaN direkt auf der SiGaN3-Monolage unterdrückt ist, tritt ein Übergang zu 3-D Inselwachstum auf, das zunächst ausschließlich in Löchern der SiGaN3-Monolage anfängt. Eine hohe Konzentration von Silizium auf der GaN (0001) Oberfläche wirkt also als Anti-Surfactant beim epitaktischen Wachstum von GaN. Rechnungen mittels der Dichtefunktionaltheorie liefern Erklärungen für das beobachtete Wachstumsverhalten. / In this work we study the basic growth and relaxation processes that are used for strain and dislocation engineering in the growth of GaN (0001) films on silicon (111) substrates. To analyse these processes, samples, grown by metalorganic vapour phase epitaxy were investigate by means of transmission electron microscopy. Our investigations have revealed the following main results: (i) Strain engineering and build-up of compressive strain in GaN (0001) films by means of AlGaN interlayer is based on an asymmetry in plastic relaxation between the two interfaces of the AlGaN interlayer. Although misfit dislocation networks form at both interfaces of the interlayer, the average spacing of dislocation lines at the lower interface is smaller than that at the upper one. (ii) Plastic relaxation of strained (0001) wurtzite films is caused mainly by formation of a-type misfit dislocations in the 1/3 |{0001} slip-system. These a-type misfit dislocations form once the strained films undergo a transition to a 3-D surface morphology, e.g. by island growth or cracking. Quantitative modelling of this process reveals that the critical thickness for nucleation of a-type misfit dislocations depends next to the lattice mismatch mainly on the growth mode of the film. (iii) Silicon delta-doping of the GaN (0001) surface leads to the growth of a coherent sub-monolayer of SiGaN3 that shows a periodic arrangement of silicon and gallium atoms and gallium vacancies. Since growth of thick GaN layers directly on top of the SiGaN3-monolayer is inhibited a transition towards 3-D island growth occurs, whereby GaN islands exclusively nucleate at openings in the SiGaN3-monolayer. A high concentration of silicon on the GaN (0001) surface thus acts as an anti-surfactant in the epitaxial growth of GaN. Our density functional theory calculations provide an explanation for both the self-limited growth of the SiGaN3-monolayer, as well as for the blocking of GaN growth on top of the SiGaN3-monolayer.

Der Begriff Maskerade unterscheidet sich trotz etymologischen Verwandschaft vom Begriff Maske. Unter Maskerade werden vor allem Strategien der Inszenierung von Geschlechtsidentitäten verstanden, weshalb synonymisch häufig von Geschlechtermaskerade die Rede ist. Das Konzept hat in den Theater-, Film- und Literaturwissenschaften sowie in der Philosophie und der Psychologie Einzug gehalten. In den Gender Studies etablierte sich der Begriff in den 1990er Jahren, maßgeblich beeinflusst durch psychoanalytische und poststrukturalistische Theoriebildung. Mit der Maskerade können sehr verschiedene Phänomene bezeichnet werden, von der Pseudonymität weiblicher Autor_innenschaft bis hin zu alltagskultureller Performance und Körperinszenierung, etwa im Transvestitismus.

Die Arbeit ist in drei Teile untergliedert: Die Struktur "Hypodermales Wasserspeichergewebe" wird unter anatomischen, ökomorphologischen und evolutionsbiologischen Gesichtspunkten betrachtet. Die Anwesenheit eines farblosen Hypoderms erschwert bei der Musteranalyse variegater Periklinalchimären die Bestimmung der Konstitution der L2. Variegate Periklinalchimären mit Hypodermbildung wurden auf die Möglichkeiten der Bestimmung der L2 hin untersucht. Es werden verschiedene Entstehungsformen von maskierenden Mustern und die noch nicht beschriebenen Ringzellen vorgestellt, die den Idiotyp der L2-bürtigen Schicht anzeigen können. Ringzellen sind die Zellen, die im Bereich der Schließzellen an den substomatären Interzellularraum grenzen. Sie bilden dabei einen Ring um die Schließzellen, der im Flächenschnitt zu erkennen ist. Hypodermale Wasserspeichergewebe sind hauptsächlich bei tropischen Arten verbreitet. Die xeromorphe Struktur kommt sowohl bei den epiphytischen Bromelien als auch bei den hygromorphen Schattenpflanzen des tropischen Regenwaldes vor. Die beiden Selektionsfaktoren Trockenheit und Lichtintensität werden als mögliche Einflussfaktoren auf die Hypodermbildung diskutiert. Beispiele dafür, dass der Faktor Licht auch einen modifikativen Einfluss auf die Differenzierung der Hypodermzellen zu haben scheint, werden vorgestellt. Die Struktur "Hypodermales Wasserspeichergewebe" ist sowohl bei Monokotylen als auch Dikotylen gleichermaßen verbreitet. Es wird daher vermutet, dass es sich um eine analoge Struktur handelt, die mehrmals voneinander unabhängig zu verschiedenen Zeiten bei verschiedenen Arten entstanden ist. Innerhalb einer Gruppe verwandter Arten konnte sie mithilfe der Homologiekriterien als homolog eingestuft werden. / This paper contains three different issues: The structure "hypodermal water storage tissue" is considered from the anatomical, the ecomorphological and evolutionary aspect. Because hypodermal layers are non-green, it is difficult to make a pattern analysis of variegated periclinal chimeras and to determine the constitution of L2. Variegated periclinal chimeras with hypodermal layers were examined to the possibilities of determining L2. Different origins of masking patterns and the non-yet described ring cells are presented. Both structures are able to show the L2-genotype. Ring cells are those cells bordering the intercellular space near the stomata. In a cut parallel to the surface the ring built by ring cells is seen. The hypodermal water storage tissue is mainly distributed among tropical species. The xeromorphic structure occurs both to the epiphytic bromeliads and to the hygromorphic shadow plants of the tropical rainforest. The environmental factors humidity and solar radiation are discussed as possible influences on the development of hypodermal layers. Examples for the apparent modifying influence of solar radiation on the development of hypodermal cells are presented. The structure "hypodermal water storage tissue" occurs both to monocots and dicots. That indicates that it is an analogues structure and that it evolved several times independent of each other in different species. Among a group of nearly related species it could be classified by the aid of the criteria of homology as a homologues structure.

Während die Verdolmetschung lautsprachlicher Theateraufführungen in die Gebärdensprache in vielen Ländern selbstverständlich und regelmäßig angeboten wird, handelt es sich in Deutschland dabei noch um Einzelerscheinungen. Eine Ausnahme stellt das Hans Otto Theater Potsdam dar, das seit 1996 regelmäßig gedolmetschte Aufführungen anbietet und dabei die Methode des Shadow Interpreting nutzt. Am Beispiel einer gedolmetschten Aufführung von „My Fair Lady“ am Hans Otto Theater werden in dieser Arbeit folgende Aspekte der gebärdensprachlichen Verdolmetschung von Theateraufführungen untersucht: Stückauswahl, Dolmetscheranzahl und Rollenverteilung, Auswahl und Einführung von Namensgebärden der Figuren, Positionierung der Dolmetscher, Rollendarstellung und Rollenwechsel, Übertragung der akustischen Ebene des Aufführungstextes (linguistische und paralinguistische Informationen, Musik, Geräusche), äußere Erscheinung der Dolmetscher, Beleuchtung der Dolmetscher und die Inkorporation der Dolmetscher in die Aufgabe.