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Townsend R, Sheridan A, Strelsin J, Duckworth M, Chirinos J, Teal V, Khan A, Kusek J, Schreiber M, Bansal N, Ojo A, Lash J, Joffe M, Investigators C. 1.4 PULSE WAVE VELOCITY AND INCIDENT HEART FAILURE IN CHRONIC KIDNEY DISEASE. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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Lyon M, Schreiber M, Coker T, Naidu K. 297: Barriers to Use of Ultrasonography for Vascular Access by Emergency Nurses. Ann Emerg Med 2010. [DOI: 10.1016/j.annemergmed.2010.06.347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Valencak J, Kittler H, Schmid K, Schreiber M, Raderer M, Gonzalez-Inchaurraga M, Birner P, Pehamberger H. Prognostic relevance of hypoxia inducible factor-1alpha expression in patients with melanoma. Clin Exp Dermatol 2010; 34:e962-4. [PMID: 20055873 DOI: 10.1111/j.1365-2230.2009.03706.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Overexpression of hypoxia inducible factor (HIF)-1alpha has been found in several human cancers and is thought to correlate with aggressive disease and poor response. A retrospective analysis was carried out on 89 patients with primary cutaneous melanoma. HIF-1alpha expression was assessed by immunohistochemistry in formalin-fixed, paraffin wax-embedded tumour sections. Overall survival (OS) and disease-free survival (DFS) were determined using univariate and multivariate analyses. Of the 89 patients, 78 (87.6%) expressed HIF-1alpha, and the remaining 11 patients (12.4%) did not. HIF-1alpha expression correlated with age (P = 0.002), but not with the main predictive factors in melanoma. Survival analysis disclosed no difference between the groups for OS and DFS. In multivariate analysis, only Breslow Index and ulceration were significantly associated with poor OS. Our results indicate that HIF-1alpha overexpression is present in most primary melanomas, but is not associated with clinicopathological variables, patient prognosis or survival.
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Raina R, Demirjian S, Navneethan S, Schreiber M, Guzman J. 245: Renal Failure in Critically Ill Patients With Influenza A (H1N1) Infection. Am J Kidney Dis 2010. [DOI: 10.1053/j.ajkd.2010.02.252] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Schreiber M, Schott GE, Rascher W, Bender AW. [Legal aspects of ritual circumcision]. KLINISCHE PADIATRIE 2009; 221:409-14. [PMID: 20013563 DOI: 10.1055/s-0029-1233494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Female circumcision (genital mutilation) is a criminal violation of human rights under German law. Even with consent of the person to be circumcised and/or her legal representative this procedure must not be carried out since a consent to female circumcision is unethical and therefore void. As much consent as there is on female circumcision the legal situation with ritual male circumcision is very unclear. In practice and unnoticed by the public male circumcision is carried out - be it for medical or ritual reasons - without deeper-going reflexions on the clearness of the medical indication or the legal situation with ritual circumcision. From the medical aspect there are big differences between female and male circumcision but also certain parallels. Various reasons, partly founded in prejudice and misinformation, make people refrain from regarding circumcision of boys also as illegal. Contrary to the prevailing opinion male circumcision also represents a bodily harm which a doctor can only carry out after a preoperative interview and with the consent of the affected person. Since ritual male circumcision does not serve the wellbeing of a child it is not possible for the parents to give their consent to the circumcision in lieu of the child. Male circumcision is only permitted if the child has given his consent and is thus only legally permitted if the child has reached an age at which he is mature enough to understand the meaning and extent of such an action which is hardly the case before he has completed his 16 (th) year.
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Ohlow MA, Schreiber M, Lauer B. [Prehospital assessment and treatment decisions of a suspected acute coronary syndrome: what are the problems? Results of the "Emergency Doctor and Acute Myocardial Infarction" study (NAAMI)]. Dtsch Med Wochenschr 2009; 134:1984-9. [PMID: 19777412 DOI: 10.1055/s-0029-1237543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Interpretation of prehospital 12-lead electrocardiograms (ECG) in acute ST-elevation myocardial infarction (STEMI) remains a diagnostic challenge in many cases. The aim of this study was to determine whether board-certified emergency physicians (BCEP) are able to distinguish STEMI from non-STEMI in a large proportion of cases, thus assuring more precise prehospital triage and treatment. METHODS Electrocardiograms of eight patients with acute non-traumatic chest pain (with 6 ECGs demonstrating STEMI, one with pericarditis, and one with pulmonary embolism) were assessed in a blinded fashion by 73 BCEP (19 female, mean age 37 +/- 5.3 years). Decisions had to be made by them regarding the diagnosis (STEMI or not) and treatment (immediate reperfusion or transfer to the nearest hospital without facilities for percutaneous coronary intervention). RESULTS In the ECGs with STEMI 83% of BCEPs made the correct diagnosis without significant differences between the subgroups. But in cases of non-STEMI-ECG only 30% of BECP made the correct diagnosis. The results in interpreting non-STEMI were better in older (> 50 years) BCEPs and in those with a background in internal medicine (p = 0.045, and p = 0.01, respectively). In case of STEMI 75% of BCEPs initiated the correct therapy, without significant differences between the subgroups. In case of non-STEMI ECG only 33% of BECPs made the correct diagnosis. Also, the therapeutic decisions in case of non-STEMI were better in older (> 50 years) BCEPs and in those with a background in internal medicine (p = 0.04, and p = 0.02 respectively). CONCLUSION In cases of acute non-traumatic chest pain the interpretation of the electrocardiogram by prehospital emergency doctors give to unsatisfactory results. The present study suggests, that additional training in ECG interpretation may be a critical component of the education of physicians who care for patients presenting with acute coronary syndrome.
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Schreiber M. XXIX. Ueber Elephantiasis vulvae. Dermatology 2009. [DOI: 10.1159/000239224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Friesdorf W, Fontaine L, Schreiber M, Winter H. Überwachung am Intensivbett - Informationsintegration. BIOMED ENG-BIOMED TE 2009. [DOI: 10.1515/bmte.1988.33.s2.81] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Vidal B, Tolosana JM, Sitges M, Delgado V, Silva E, Castel MA, Brugada J, Mont L, Khan FZ, Read PA, Salahshouri P, Bayrakdar MA, Matousova D, Virdee MS, Fynn SP, Dutka DP, Clemens M, Nagy-Balo E, Herczku C, Kun C, Toth Z, Edes I, Csanadi Z, Theilade J, Holmegard HN, Dunoe M, Olesen MS, Haunsoe S, Benn M, Svendsen JH, Digby G, Daubney ME, Baggs J, Campbell D, Simpson CS, Redfearn DP, Abdollah H, Baranchuk A, Seifert M, Schau T, Moeller V, Meyhoefer J, Fleck E, Butter C, Raffa S, Grosse A, Brunelli M, Regoli F, Schreiber M, Wauters K, Geller JC, Carmo P, Cavaco D, Adragao P, Parreira L, Santos K, Morgado F, Marcelino S, Silva A, Muto C, Celentano E, Canciello M, Carreras G, Calvanese R, Ascione L, Accadia M, Tuccillo B, Froehlig G, Sperzel J, Vogt J, Anselme F, Ducloux P, Ziglio F, Krumel F, Derval N, Steendijk P, Bordachar P, Deplagne A, Ritter P, Clementy J, Haissaguerre M, Jais P, Ismer B, Koerber T, Heinke M, Voss W, Trautwein U, Nienaber CA, Chang PC, Lin FC, Wang CC, Sargento L, Carpinteiro L, Marques P, Veiga A, Cortez-Dias N, Sousa J, Castellant P, Orhan E, Fatemi M, Etienne Y, Valls-Bertault V, Blanc JJ, Buck S, Maass AH, Schoonderwoerd BA, Van Veldhuisen DJ, Van Gelder IC, Vatasescu RG, Berruezo A, Mont L, Tamborero D, Tolosana JM, Brugada J, Tolosana JM, Mont L, Sitges M, Berruezo A, Delgado V, Tamborero D, Morales M, Brugada J, Teixeira R, Antonio N, Coelho L, Lourenco C, Ventura M, Cristovao J, Elvas L, Providencia LA, Matsushita K, Ishikawa T, Sumita S, Yamakawa Y, Matsumoto K, Hosoda J, Miki Y, Umemura S. Poster Session 4: CRT I. Europace 2009. [DOI: 10.1093/europace/euq240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Seseke S, Schreiber M, Rebmann U, Seseke F. [Spontaneous perirenal hematomas in patients taking anticoagulation medication or having a bleeding diathesis]. Aktuelle Urol 2008; 39:215-8. [PMID: 18478495 DOI: 10.1055/s-2007-1016433] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Spontaneous perirenal hematoma is a rare condition. The clinical features are acute flank or abdominal pain, haematuria, hypotension and shock. Bleeding is most commonly caused by renal tumours, especially angiomyolipomas. Other known causes are long-term haemodialysis, arteriosclerosis or arteritis. A total of 6 patients with spontaneous perirenal haemorrhage have been treated in our hospital since 2003. Nearly all patients had been taking anticoagulation medication. One had a bleeding diathesis. One of the patients died immediately after admission at the hospital. All other patients had an exploratory laparotomy. In three cases total nephrectomy had to be performed, two other patients could be treated with partial nephrectomy. In patients with non-traumatic acute flank or abdominal pain it is important to determine whether the patient has been taking anticoagulation medication or suffers from bleeding diathesis because there is a high incidence of bleeding complications in these cases. If an emergent laparotomy is not necessary we recommend that these cases should be treated surgically after clinical stabilisation because tumours are the main reason for the haematomas and the patients have an urgent need for further anticoagulation therapy.
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Wittgens W, Schreiber M. Treatment of affective Symptoms in Geriatric Psychiatry with Pregabalin. PHARMACOPSYCHIATRY 2007. [DOI: 10.1055/s-2007-991738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zugor V, Horch RE, Labanaris AP, Schreiber M, Schott GE. [Penoscrotal elephantiasis: diagnostics and treatment options]. Urologe A 2007; 47:472-6. [PMID: 17726597 DOI: 10.1007/s00120-007-1379-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Penoscrotal elephantiasis is a symptom that can be caused by local but also by systemic disorders. When the changes are reversible, conservative measures such as physical and antiphlogistic approaches lead to success. In cases of irreversible penoscrotal elephantiasis, excision and amputation of the affected penoscrotal areas are recommended to eliminate the functional disturbances. In all manifestations it is important to prevent and treat those diseases known to cause elephantiasis.
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Riad W, Schreiber M, Saeed AB. Monitoring with EEG entropy decreases propofol requirement and maintains cardiovascular stability during induction of anaesthesia in elderly patients. Eur J Anaesthesiol 2007; 24:684-8. [PMID: 17425814 DOI: 10.1017/s026502150700018x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND OBJECTIVES Electroencephalographic entropy is used to measure the degree of brain hypnosis and anaesthesia depth. Two parameters are displayed in the monitor, state entropy (SE) and response entropy (RE). Ageing leads to reduction in liver mass as well as hepatic blood flow, which decreases clearance of propofol and increases the risk of cardiovascular adverse effects. The aim of this study is to demonstrate the effect of electroencephalographic entropy on propofol requirement and haemodynamic parameters during induction of anaesthesia in elderly patients. METHODS We studied 72 elderly patients. Standard monitoring was performed for all patients together with entropy monitor. Patients were allocated randomly either to the control group, which were given the recommended induction dose of propofol, or to the entropy group which was induced with propofol based on entropy reading where the end-point was SE 50 and SE-RE difference less than 10. Propofol induction doses and haemodynamic changes were recorded. Anaesthesia was maintained using sevoflurane and O2 air mixture. RESULTS After induction of anaesthesia, the systolic, diastolic, mean arterial pressure, RE and SE were significantly lower in the control group (P value < 0.05). Total dose of propofol and the dose kg-1 were significantly reduced by 37.1% and 31.8%, respectively, in the entropy group (P value < 0.01). CONCLUSION The use of electroencephalographic entropy during induction of anaesthesia in elderly patients reduces propofol requirements and maintains cardiovascular stability.
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Aigner K, Dampier B, Descovich L, Mikula M, Sultan A, Schreiber M, Mikulits W, Brabletz T, Strand D, Obrist P, Sommergruber W, Schweifer N, Wernitznig A, Beug H, Foisner R, Eger A. The transcription factor ZEB1 (deltaEF1) promotes tumour cell dedifferentiation by repressing master regulators of epithelial polarity. Oncogene 2007; 26:6979-88. [PMID: 17486063 PMCID: PMC2899859 DOI: 10.1038/sj.onc.1210508] [Citation(s) in RCA: 484] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Epithelial to mesenchymal transition (EMT) is implicated in the progression of primary tumours towards metastasis and is likely caused by a pathological activation of transcription factors regulating EMT in embryonic development. To analyse EMT-causing pathways in tumourigenesis, we identified transcriptional targets of the E-cadherin repressor ZEB1 in invasive human cancer cells. We show that ZEB1 repressed multiple key determinants of epithelial differentiation and cell-cell adhesion, including the cell polarity genes Crumbs3, HUGL2 and Pals1-associated tight junction protein. ZEB1 associated with their endogenous promoters in vivo, and strongly repressed promotor activities in reporter assays. ZEB1 downregulation in undifferentiated cancer cells by RNA interference was sufficient to upregulate expression of these cell polarity genes on the RNA and protein level, to re-establish epithelial features and to impair cell motility in vitro. In human colorectal cancer, ZEB1 expression was limited to the tumour-host interface and was accompanied by loss of intercellular adhesion and tumour cell invasion. In invasive ductal and lobular breast cancer, upregulation of ZEB1 was stringently coupled to cancer cell dedifferentiation. Our data show that ZEB1 represents a key player in pathologic EMTs associated with tumour progression.
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Zugor V, Schreiber M, Klein P, Schott GE. [Urinary bladder augmentation using the stomach in patients with compensated renal insufficiency]. Urologe A 2007; 46:667-70. [PMID: 17401549 DOI: 10.1007/s00120-007-1324-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This case report describes a female patient with bladder exstrophy and chronic compensated renal insufficiency as it relates to the topic of urinary bladder augmentation using the stomach and cutaneous vesicostomy with a Mitrofanoff continent stoma. Due to complete congenital bladder exstrophy the patient underwent functional reconstructive surgery for cystoschisis and several revision procedures. Because of a low-capacity, low-compliance bladder with bilateral urinary stasis in the kidneys, temporary percutaneous renal fistulas were created on both sides. After the patient had declined any follow-up during her pubertal years, advanced bilateral renal damage ensued. In a state of compensated renal insufficiency with creatinine levels >2 mg/dl, the patient was offered surgery for placement of an incontinent bladder substitute as an ileal or colon conduit because of the progressive kidney damage with obstructive uropathy. Since the patient rejected any form of wet stoma despite several consultations, after adequate preparations were met, a gastrocystoplasty and Mitrofanoff cutaneous vesicostomy with an umbilical stoma and artificial umbilicoplasty were performed. The patient catheterizes herself six times daily and is under close urological/nephrological supervision.In exceptional cases, gastrocystoplasty is an alternative to construction of a neobladder from bowel segments. It is particularly indicated for patients with compensated or already poor kidney function. The interventions are associated with several specific complications. There have as yet been no reports of malignant degeneration inside the gastric portion used for augmentation or the urothelium exposed to stomach acid. However, pathological and precancerous alterations of mucous membranes have been observed, which should be regularly monitored by endoscopy/biopsy and warrant further long-term studies.
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Müller UA, Schreiber M, Müller N, Wendenburg J, Dost A, Kloos C, Hunger-Dathe W, Wolf G. Behandlungsqualität von Patienten mit Diabetes mellitus Typ 1 fünf Jahre nach Transition von der pädiatrischen in die internistische Diabetesambulanz. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Phillips C, Tieu B, Hagg D, Schreiber M. Extravascular lung water following resuscitation of hemorrhagic shock in swine: comparison between Ringers' lactate and normal saline. Crit Care 2007. [PMCID: PMC4095459 DOI: 10.1186/cc5566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Schreiber M, Schneider R. Cognitive plasticity in people at risk for dementia: optimising the testing-the-limits-approach. Aging Ment Health 2007; 11:75-81. [PMID: 17164161 DOI: 10.1080/13607860600735887] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
A topic of great interest in gerontology research is the prediction of cognitive deterioration which marks the transition from mild cognitive impairment (MCI) to dementia. In this area, the term cognitive plasticity can be of great interest. We examined the utility of the Adaptive Figure Series Learning Test (ADAFI) to evoke cognitive plasticity and to show whether reduced plasticity can be found in people with MCI. In a pre-test-intervention-post-test design, intervention with the ADAFI was compared to an unspecific brain jogging task in MCI participants and healthy controls. A total of 42 subjects were included. Independent of mental health status only using the ADAFI led to pronounced improvements in post-test performances, but MCI participants profited less from the intervention with the ADAFI than healthy controls, that is, showed lower cognitive plasticity. Thus, the overlap in performance distributions between healthy participants and MCI individuals at pre-test was reduced at the time of post-test once the ADAFI had been given as intervention. The findings of the present article indicate that plasticity oriented information can be gained when the ADAFI is given as an intervention in a pre-test-training-post-test-design. The cognitive plasticity approach seems potentially useful for purposes of early identification of dementia.
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Terentyev A, Scholz R, Schreiber M, Seifert G. Theoretical investigation of excited states of C(3). J Chem Phys 2006; 121:5767-76. [PMID: 15367001 DOI: 10.1063/1.1786291] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this work, we present ab initio calculations for the potential energy surfaces of C(3) in different electronic configurations, including the singlet ground state [X (1)Sigma(g) (+),((1)A(1))], the triplet ground state [a (3)Pi(u),((3)B(1), (3)A(1))], and some higher excited states. The geometries studied include triangular shapes with two identical bond lengths, but different bond angles between them. For the singlet and triplet ground states in the linear geometry, the total energies resulting from the mixed density functional--Hartree-Fock and quadratic configuration interaction methods reproduce the experimental values, i.e., the triplet occurs 2.1 eV above the singlet. In the geometry of an equilateral triangle, we find a low-lying triplet state with an energy of only 0.8 eV above the energy of the singlet in the linear configuration, so that the triangular geometry yields the lowest excited state of C(3). For the higher excited states up to about 8 eV above the ground state, we apply time-dependent density functional theory. Even though the systematic error produced by this approach is of the order of 0.4 eV, the results give different prospective to insight into the potential energy landscape for higher excitation energies.
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Abe S, Schreiber M, Su WP, Yu J. Third Harmonic Generation in Conjugated Polymers: Exciton Effect and Influence of Disorder. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259208046867] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Lukáš Z, Maňák J, Bednařík J, Schreiber M. G.P.7 04 Development of neurogenic and myogenic conditions in critical illness neuromuscular disorders: follow-up histopathological study. Neuromuscul Disord 2006. [DOI: 10.1016/j.nmd.2006.05.189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schreiber M, Maschke K. Coherent and incoherent electron transport along a disordered chain. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/13642819208204897] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Englehart M, Tieu B, Kiraly L, Sawai R, Schreiber M. THE INFLUENCE OF ANESTHESIA ON A SWINE MODEL OF HEMORRHAGIC SHOCK. Shock 2006. [DOI: 10.1097/00024382-200606001-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Loppacher C, Zerweck U, Eng LM, Gemming S, Seifert G, Olbrich C, Morawetz K, Schreiber M. Adsorption of PTCDA on a partially KBr covered Ag(111) substrate. NANOTECHNOLOGY 2006; 17:1568-1573. [PMID: 26558560 DOI: 10.1088/0957-4484/17/6/006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ordered growth of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Ag(111) partially covered by one or two monolayers of KBr was investigated by non-contact AFM with molecular resolution. Different adsorption patterns are found on the pure substrate, the one covered by a single monolayer, and the one covered by two monolayers KBr. Simulations with an extended Ising-type model reproduce these experimental patterns very well. The adsorbate-adsorbate and the adsorbate-substrate interaction parameters obtained from the simulation are discussed with respect to the interactions at the Ag(111)|KBr interface. As a result, alkali halide covered metals can be used for tuning the interactions and designing adsorption systems, which opens up new possibilities in the control of self-assembled nanostructures.
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