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Mascus R, Engel X, Hoffmann G. Operative Konzepte zur Behandlung von Senkungszuständen des Genitales unter Einsatz etablierter Descensusoperationen sowie Verwendung transobturatoriell und transischiorectal fixierter Netzimplantate. Geburtshilfe Frauenheilkd 2007. [DOI: 10.1055/s-2007-984664] [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] Open
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Hoffmann G, Ruppert M, Lackner C. Stellenwert der Beatmung im Rahmen der Ersthelferreanimation. Notf Rett Med 2007. [DOI: 10.1007/s10049-007-0921-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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103
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Laffont I, Hoffmann G, Dizien O, Revol M, Roby-Brami A. How do C6/C7 tetraplegic patients grasp balls of different sizes and weights? Impact of surgical musculo-tendinous transfers. Spinal Cord 2007; 45:502-12. [PMID: 17325696 DOI: 10.1038/sj.sc.3102047] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
STUDY DESIGN Prospective control cohort study. OBJECTIVES To develop a new test to analyse qualitatively grasping strategies in C6/C7 tetraplegic patients, and to quantify the effect of musculo-tendinous transfers. SETTING France. METHODS Twelve C6/C7 tetraplegic adults (17 arms; 31.3+/-7.9 years) and 17 healthy subjects (30.9+/-9.4 years) completed the study. We assessed participants' ability to grasp, move and release standardized balls of variable sizes and weights. OUTCOME MEASURES Failures, movement duration (MD), grip patterns, forearm orientation during transport. RESULTS In patients as well as in controls, the number of digits involved in prehension increased proportionally to the size and weight of the ball. C6 non-operated tetraplegic patients failed 38.2% of the tasks. They frequently used supine transport (51.4% of successful tasks). MD was longer, with a large distribution of values. The presence of active elbow extension poorly influenced the amount of failure nor grip configuration, but significantly reduced MD and supine transport (34%). Patients who were evaluated after hand surgery showed a trend towards improved MD and more frequent completion (failure 30%), especially for middle-sized and middle-weighted balls. Grip patterns were deeply modified, and all transports were made in pronation. CONCLUSION The 'Tetra Ball Test' evidences the characteristics of grasping in tetraplegic patients and those influenced by surgery. It may be useful in understanding effects of surgical procedures. This preliminary study must be completed to evaluate the quantitative responsiveness and reproducibility of this test and to develop instrumented electronic balls to optimise it.
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Hoffmann G. More on: neopterin induces the proatherothrombotic phenotype in human coronary endothelial cells. J Thromb Haemost 2007; 5:211-2. [PMID: 17059430 DOI: 10.1111/j.1538-7836.2006.02287.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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105
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Hoffmann G, Cavus E, Quaden R, Tarutis V, Bein B, Böning A, Cremer J. Effect of selective cerebral perfusion with different temperatures on cerebral metabolism. Thorac Cardiovasc Surg 2007. [DOI: 10.1055/s-2007-967295] [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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106
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Bagci S, Zschocke J, Hoffmann G, Bast T, Heep A, Müller A, Kau N, Bartmann P, Franz A. Pyridoxalphosphat zur Therapie einer schweren neonatalen, konvulsiven Enzephalopathie. Z Geburtshilfe Neonatol 2006. [DOI: 10.1055/s-2006-946252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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107
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Fayad F, Hoffmann G, Hanneton S, Yazbeck C, Lefevre-Colau MM, Poiraudeau S, Revel M, Roby-Brami A. 3-D scapular kinematics during arm elevation: effect of motion velocity. Clin Biomech (Bristol, Avon) 2006; 21:932-41. [PMID: 16774803 DOI: 10.1016/j.clinbiomech.2006.04.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Revised: 04/12/2006] [Accepted: 04/19/2006] [Indexed: 02/07/2023]
Abstract
BACKGROUND No three-dimensional (3-D) data exist on the influence of motion velocity on scapular kinematics. The effect of arm elevation velocity has been studied only in a two-dimensional setting. METHODS Thirty healthy subjects performed dominant (right) arm elevation in two planes, sagittal and frontal, and at slow and fast self-selected arm speed. Scapular orientation and humeral elevation were measured at 30 Hz recording frequency with use of a 6-degree-of-freedom electromagnetic system (Polhemus Fastraka). Motion was computed according to the International Society of Biomechanics standards. Scapular orientation was also determined with the arm held in different static positions. FINDINGS We obtained a full 3-D kinematic description of scapula achieving a reliable, complex 3-D motion during humeral elevation and lowering. The maximal sagittal arm elevation showed a characteristic "M"-shape pattern of protraction/retraction curve. Scapular rotations did not differ significantly between slow and fast movements. Moreover, protraction/retraction and tilt angular values did not differ significantly between static and dynamic tasks. However, scapular lateral rotation values differed between static and dynamic measurements during sagittal and frontal arm elevation. Lateral scapular rotation appears to be less in static than in dynamic measurement, particularly in the sagittal plane. INTERPRETATION Interpolation of statically recorded positions of the bones cannot reflect the kinematics of the scapula.
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Hoffmann G, van den Ingh TSGAM, Bode P, Rothuizen J. Copper-associated chronic hepatitis in Labrador Retrievers. J Vet Intern Med 2006; 20:856-61. [PMID: 16955809 DOI: 10.1892/0891-6640(2006)20[856:cchilr]2.0.co;2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This study summarizes the clinical and pathologic findings in 15 Labrador Retrievers with copper-associated chronic hepatitis (CACH). Our hypothesis was that this form of hepatitis is caused by a defect in hepatic copper metabolism, which most likely originates from a genetic defect. Affected Labradors consisted of 11 female and 4 male Labrador Retrievers. Eight family members of 2 of these patients were examined prospectively, as were 6 unrelated healthy Labrador Retrievers. All dogs were registered at the breed club. The average age at clinical presentation was 7 years (range, 2.5-10.5 years). All dogs were presented for anorexia, which was associated with vomiting in 8 patients. The diagnosis of CACH was based on histologic examination of liver biopsy specimens in all dogs, including semiquantitation of copper. A disproportionate increase in alanine aminotransferase (ALT) activity relative to alkaline phosphatase (ALP) activity, as well as the centrolobular localization of copper and the association of copper accumulation with hepatic lesions, suggested a primary copper storage disease rather than primary cholestatic liver disease causing copper accumulation. Mean hepatic copper concentration measured in related Labradors was 1,317 microg/g dry weight liver (range, 402-2,576 microg/g). Mean hepatic copper concentration of unrelated normal Labradors was 233 microg/g dry weight liver (range, 120-304 microg/g). Our findings support the hypothesis that a hereditary form of hepatitis occurs in Labrador retrievers and is caused by a defect in hepatic copper metabolism.
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Hartel M, Hoffmann G, Wente MN, Martignoni ME, Büchler MW, Friess H. Randomized clinical trial of the influence of local water-filtered infrared A irradiation on wound healing after abdominal surgery. Br J Surg 2006; 93:952-60. [PMID: 16845694 DOI: 10.1002/bjs.5429] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Abstract
Background
Postoperative local water-filtered infrared A (wIRA) irradiation improves tissue oxygen partial pressure, tissue perfusion and tissue temperature, which are important in wound healing.
Methods
The effect of wIRA irradiation on abdominal wound healing following elective gastrointestinal surgery was evaluated. Some 111 patients undergoing moderate to major abdominal surgery were randomized into one of two groups: wIRA and visible light irradiation (wIRA group) or visible light irradiation alone (control group). Uncovered wounds were irradiated twice a day for 20 min from days 2–10 after operation.
Results
Irradiation with wIRA improved postoperative wound healing in comparison to visible light irradiation alone. Main variables of interest were: wound healing assessed on a visual analogue scale (VAS) by the surgeon (median 88·6 versus 78·5 respectively; P < 0·001) or patient (median 85·8 versus 81·0; P = 0·040), postoperative pain (median decrease in VAS score during irradiation 13·4 versus 0; P < 0·001), subcutaneous oxygen tension after irradiation (median 41·6 versus 30·2 mmHg; P < 0·001) and subcutaneous temperature after irradiation (median 38·9 versus 36·4 °C; P < 0·001). The overall result, in terms of wound healing, pain and cosmesis, measured on a VAS by the surgeon (median 79·0 versus 46·8; P < 0·001) or patient (79·0 versus 50·2; P < 0·001) was better after wIRA irradiation.
Conclusion
Postoperative irradiation with wIRA can improve normal postoperative wound healing and may reduce costs in gastrointestinal surgery.
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Hoffmann G, Ingh T, Bode P, Rothuizen J. Copper-Associated Chronic Hepatitis in Labrador Retrievers. J Vet Intern Med 2006. [DOI: 10.1111/j.1939-1676.2006.tb01798.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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111
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Greie S, Humpeler E, Gunga HC, Koralewski E, Klingler A, Mittermayr M, Fries D, Lechleitner M, Hoertnagl H, Hoffmann G, Strauss-Blasche G, Schobersberger W. Improvement of metabolic syndrome markers through altitude specific hiking vacations. J Endocrinol Invest 2006; 29:497-504. [PMID: 16840826 DOI: 10.1007/bf03344138] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
To study the influence of a 3-week hiking vacation at moderate (1700 m) and low altitude (LA) (200 m) on key-markers of the metabolic syndrome, 71 male volunteers (age 36-66 yr old) with the metabolic syndrome [according to the National Cholesterol Education Program's Adult Treatment Panel III (NCEP-ATP III) - or World Health Organization (WHO) - definition] participated in the study and were randomly assigned into a moderate altitude (MA) group (1700 m, no. 36) and a low altitude (LA) group (200 m, no. 35). The 3-week vacation program included 12 moderate- intensity guided hiking tours [4 times/week, 55-65% heart rate maximum (HRmax)] with a total exercise time of 29 h plus moderate recreational activities. Both study groups had a comparable and balanced nutrition with no specific dietary restrictions. Anthropometric, metabolic and cardiovascular parameters were measured 10-14 days before vacation, several times during the 3-week vacation, 7-10 days and 6-8 weeks after return. All participants tolerated the vacation without any adverse effects. Body weight, body fat, waist-circumference, fasting glucose, total cholesterol, LDL-cholesterol (LDL-C), plasma fibrinogen, resting systolic and diastolic blood pressure were significantly decreased over time in both study groups. In the LA group, fasting insulin and homeostasis model assessment (HOMA)-index were significantly decreased one week after return. Relative cycle ergometry performance was significantly increased after return compared to baseline. In both study groups, waist-to-hip ratio (WHR), 2-h oral glucose tolerance test (OGTT), HDL-cholesterol (HDL-C), and triglycerides remained unchanged. The 3-week vacation intervention at moderate and LA had a positive influence on all key-markers of the metabolic syndrome. No clinically relevant differences could be detected between the study groups. A hiking vacation at moderate and LA can be recommended for people with stable, controlled metabolic and cardiovascular risk factors.
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112
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Bagci S, Zschocke J, Hoffmann G, Bast T, Heep A, Müller A, Kau N, Bartmann P, Franz A. Pyridoxalphosphat zur Therapie einer schweren neonatalen, konvulsiven Enzephalopathie. Z Geburtshilfe Neonatol 2006. [DOI: 10.1055/s-2006-943337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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113
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Hoffmann G, Laffont I, Hanneton S, Roby-Brami A. How to extend the elbow with a weak or paralyzed triceps: control of arm kinematics for aiming in C6-C7 quadriplegic patients. Neuroscience 2006; 139:749-65. [PMID: 16448777 DOI: 10.1016/j.neuroscience.2005.12.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Revised: 09/24/2005] [Accepted: 12/12/2005] [Indexed: 10/25/2022]
Abstract
This study aims to investigate how quadriplegic patients with a C6-C7 spinal lesion coordinate their upper limb to extend the elbow despite the paralysis or weakness of the triceps brachii, and what is the effect of a surgical musculotendinous transfer. For this purpose, aiming movements in a wide workspace were recorded in seven healthy subjects and in patients with incomplete (five cases) or complete (eight cases) triceps paralysis and after musculotendinous transfer (eight cases). We used four electromagnetic field sensors to quantify hand trajectory and to compute the angles describing the rotations at the scapula, glenohumeral joint, elbow and wrist (10 degrees of freedom). Extent and smoothness of the hand trajectories and hand velocity profiles were surprisingly similar between healthy subjects and quadriplegic patients. The reduction of elbow extension observed in patients was compensated by rotations distributed across several degrees of freedom including the scapula. Principal components analysis showed that the joint rotations could be summarized by an additive combination of two synergies, respectively orientating and stretching out the limb, which explained similar amounts of variance in healthy subjects and in patients. The participations of degrees of freedom in the synergies were roughly similar in the different groups of subjects, the main difference concerning scapular medial-lateral rotation, which seems to be critical in patients with a complete triceps paralysis. This demonstrates that elbow extension in quadriplegic patients is due to anticipated mechanical interaction coupling between upper limb segments. We propose that the persisting (incomplete paralysis) or restored (musculotendinous transfer) elbow extensor strength may act by stabilizing the elbow. This counterintuitive preservation of limb kinematics for horizontal aiming movements in quadriplegic patients despite the drastic changes in muscle action provoked by paralysis and/or by surgery strongly suggests that the motor system does not primarily control forces but the morphological aspects of movement, via joint rotation synergies.
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LeGrande AN, Schmidt GA, Shindell DT, Field CV, Miller RL, Koch DM, Faluvegi G, Hoffmann G. Consistent simulations of multiple proxy responses to an abrupt climate change event. Proc Natl Acad Sci U S A 2006; 103:837-42. [PMID: 16415159 PMCID: PMC1348000 DOI: 10.1073/pnas.0510095103] [Citation(s) in RCA: 157] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Isotope, aerosol, and methane records document an abrupt cooling event across the Northern Hemisphere at 8.2 kiloyears before present (kyr), while separate geologic lines of evidence document the catastrophic drainage of the glacial Lakes Agassiz and Ojibway into the Hudson Bay at approximately the same time. This melt water pulse may have been the catalyst for a decrease in North Atlantic Deep Water formation and subsequent cooling around the Northern Hemisphere. However, lack of direct evidence for ocean cooling has lead to speculation that this abrupt event was purely local to Greenland and called into question this proposed mechanism. We simulate the response to this melt water pulse using a coupled general circulation model that explicitly tracks water isotopes and with atmosphere-only experiments that calculate changes in atmospheric aerosol deposition (specifically (10)Be and dust) and wetland methane emissions. The simulations produce a short period of significantly diminished North Atlantic Deep Water and are able to quantitatively match paleoclimate observations, including the lack of isotopic signal in the North Atlantic. This direct comparison with multiple proxy records provides compelling evidence that changes in ocean circulation played a major role in this abrupt climate change event.
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Prokop K, Patzer S, Heß C, Hoffmann G, Patzer L. Neonatale muskuläre Hypotonie als wichtiges Leitsymptom einer seltenen Diagnose- Das Smith-Lemli-Opitz-Syndrom – ein Fallbericht. Z Geburtshilfe Neonatol 2005. [DOI: 10.1055/s-2005-871505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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116
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Rieder J, Lirk P, Bodrogi F, Sawires M, Gruber G, Hoffmann G. Cisatracurium, but not mivacurium, induces apoptosis in human umbilical vein endothelial cells in vitro. Eur J Anaesthesiol 2005; 22:16-9. [PMID: 15816567 DOI: 10.1017/s0265021505000049] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE Cisatracurium is an intermediate acting, non-depolarizing neuromuscular blocking agent. Previous reports have indicated a growth-inhibitory effect of the isoforms cisatracurium and atracurium on two human cell lines in vitro. These effects were ascribed to oxidative stress elicited by acrylate esters formed during cisatracurium breakdown. Oxidative stress is a potent precipitator of apoptosis. Therefore, the aim of the present study was to investigate whether the growth-inhibitory effects of cisatracurium could be explained by initiation of apoptosis. METHODS Human umbilical vein endothelial cells were incubated with cisatracurium at concentrations of 0.96, 3.2, 9.6, 32 and 96 micromol for 24 h. DNA fragmentation was measured using the Cell Death Detection ELISA Plus assay (Roche Diagnostics, Mannheim, Germany). RESULTS There was a dose dependency of cisatracurium with respect to the rate of apoptosis in human umbilical vein endothelial cells. Programmed cell death could be demonstrated at concentrations encountered in human plasma after single-bolus injections of cisatracurium. Apoptosis was attenuated by the concomitant administration of glutathione. CONCLUSIONS These findings strongly support the hypothesis that acrylate esters, breakdown products of cisatracurium, induce oxidative stress and, subsequently, apoptosis.
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Pollow K, Schaffrath M, Kölbl H, Lebrecht A, Schönegg W, Hoffmann G, Elling D, Köhler U, Winzer K, Kreienberg R, du Bois A. Phase-II-Studie zur kombinierten Exemestan- und Goserelin-Adjuvanz-Therapie mit und ohne Tibolon bei prämenopausalen Frauen mit rezeptorpositivem und nodal-negativem Mammakarzinom: ADAGIO-Studie. Geburtshilfe Frauenheilkd 2005. [DOI: 10.1055/s-2005-865726] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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118
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Dieterich H, Heyl V, Scheler P, Blazek J, Hoffmann G, Nestle-Kr�mling C. Rekonstruktion der Brust mit Eigengewebe. GYNAKOLOGE 2005. [DOI: 10.1007/s00129-005-1665-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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119
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Loeffen J, Smeets R, Voit T, Hoffmann G, Smeitink J. Fumarase deficiency presenting with periventricular cysts. J Inherit Metab Dis 2005; 28:799-800. [PMID: 16151915 DOI: 10.1007/s10545-005-0044-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A fumarase-deficient patient expressed a novel phenotype of congenital cerebral ventricular dilatation and periventricular cysts. The patient was a compound heterozygote for two mutations that are the only ones among the 12 published mutations that have been found in multiple, unrelated, fumarase-deficient patients.
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120
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Franck HH, Bredig MA, Hoffmann G. Zur Kenntnis des Calciumcarbides. I. Über eine neue kristallisierte Phase des Calciumcarbides. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/zaac.19372320107] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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121
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Hoffmann G, Dietzel ID. Thyroid hormone regulates excitability in central neurons from postnatal rats. Neuroscience 2004; 125:369-79. [PMID: 15062980 DOI: 10.1016/j.neuroscience.2004.01.047] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/12/2004] [Indexed: 02/06/2023]
Abstract
A lack of thyroid hormone in the postnatal period causes an irreversible mental retardation, characterized by a slowing of thoughts and movements accompanied by prolonged latencies of several evoked potentials and slowed electroencephalographic rhythms. Here we show that in cultured hippocampal and cortical neurons from postnatal rats treatment with thyroid hormone not only up-regulates Na(+)-current densities but also increases rates of rise, amplitudes and firing frequencies of action potentials. Furthermore, we show that the regulation of the Na(+)-current density by thyroid hormones also occurs in vivo: recordings from acutely isolated cortical neurons obtained from hypothyroid, euthyroid and hyperthyroid postnatal rats showed that hypothyroidism decreases the ratio of Na(+) inward- to K(+) outward-currents while hyperthyroidism upregulates Na(+)-currents with respect to K(+)-currents. Our observation of a regulation of neuronal excitability by thyroid hormone offers a direct explanation for the origin of various neurological symptoms related to thyroid dysfunction.
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122
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Pollow K, Schoenegg W, Koelbl H, Kreienberg R, Dubois A, Elling D, Winzer KJ, Koehler U, Hoffmann G. Safety and tolerability of adjuvant exemestane plus goserelin with or without tibolone in receptor-positive, node-negative primary breast cancer in premenopausal women: The final results of the randomized multicenter ADAGIO pilot study. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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123
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Bauer J, Janecke A, Doege C, Linderkamp O, Hoffmann G. Der Einfluss der Tageszeit auf den Sauerstoffverbrauch von Frühgeborenen. Z Geburtshilfe Neonatol 2004. [DOI: 10.1055/s-2004-829339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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124
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Walter C, Philippi G, Westerhausen R, Hoffmann G, Busch HP. Poster zum Thema „Gefäße“ (MRT, CT/MR-Angiographie) Hochauflösende Kontrastmittel-gestützte 3D-MR-Angiographie (MRA) der Carotiden: Einfluss unterschiedlicher Ortsauflösung auf die Bildqualität. ROFO-FORTSCHR RONTG 2004. [DOI: 10.1055/s-2004-828541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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125
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Happel P, Hoffmann G, Mann SA, Dietzel ID. Monitoring cell movements and volume changes with pulse-mode scanning ion conductance microscopy. J Microsc 2003; 212:144-51. [PMID: 14629563 DOI: 10.1046/j.1365-2818.2003.01248.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Here we describe the use of pulse-mode scanning ion conductance microscopy (SICM) to observe volume changes and cell membrane movements during the locomotion of cultured cells in the range of minutes to several hours. The microscope is based on the pulse-mode SICM previously developed for stable imaging of single cells in culture. Our instrument uses current pulses to control the distance between cell surface and electrode tip as well as a back-step mode to prevent contact of tip and membrane during lateral movements of the probe. We performed repeated scans of cell surfaces using feedback-controlled piezoactors to position the electrode. Using patch-clamp-type electrode tips the height of cells could reproducibly be measured with a standard deviation of 50 nm. To quantify and separate changes in cell position and volume occurring between consecutive scans, a program was written to subtract images and calculate volume changes. Examples of repeated scans show that membrane movements in the range of 30 min to a few hours can be quantitatively monitored with a lateral resolution of 500 nm using difference images and that faster movements in the range of minutes can be recorded at defined cell sections using the line scan mode. Difference images indicate that volume changes can affect cell surfaces inhomogeneously, emphasizing the role of the cytoskeleton in the stabilization of cell shape.
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