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Weibel J, Lin YS, Landolt HP, Garbazza C, Meyer M, Slawik H, Borgwardt S, Reichert C, Cajochen C. 0180 Influence of Long-Term Caffeine Consumption and Its Withdrawal on Subjective Sleepiness, Vigilance, and Melatonin. Sleep 2018. [DOI: 10.1093/sleep/zsy061.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- J Weibel
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
| | - Y S Lin
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
- Neuropsychiatry and Brain Imaging, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
| | - H P Landolt
- Institute of Pharmacology and Toxicology, University of Zürich, Zürich, SWITZERL
- Zürich Center for Interdisciplinary Sleep Research, University of Zürich, Zürich, SWITZERL
| | - C Garbazza
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
| | - M Meyer
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
- Clinical Sleep Laboratory, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
| | - H Slawik
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
- Clinical Sleep Laboratory, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
| | - S Borgwardt
- Neuropsychiatry and Brain Imaging, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
| | - C Reichert
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
| | - C Cajochen
- Centre for Chronobiology, Psychiatric Hospital of the University of Basel, Basel, SWITZERL
- Transfaculty Research Platform Molecular and Cognitive Neurosciences, University of Basel, Basel, SWITZERL
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Weibel J, Basishvili T, Dattler M, Garbazza C, Rudzik F, Renz C, Cajochen C. 0164 EFFECT OF A DAYLIGHT LED VERSUS A CONVENTIONAL LED SOLUTION ON VISUAL COMFORT, DAYTIME ALERTNESS AND SLEEP. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Weibel J, Glonek T. Ketone production in ultra marathon runners. J Sports Med Phys Fitness 2007; 47:491-495. [PMID: 18091692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
AIM The aim of this study was to determine the magnitude of ketone production in ultra marathon runners and what affect if any this has on performance. METHODS Participants in the Cliff Young Australian Six Day Race (n=31) provided a prerace urine sample and, then, random urine samples throughout the duration of the event, ranging from 4-20 samples each. Based on urinalysis results, participants were divided into two groups: those who formed ketones (ketone group), and those who did not form ketones or formed ketones only once during a race at the lowest recordable value (non-ketone group). RESULTS The average ketone level of the 22 athletes in the ketone group (value+/-standard deviation: 5.67+/-5.59 mg/dL) was statistically different from 9 athletes who were in the non-ketone group (0.18+/-0.14 mg/dL) (P<0.05). The average distances run for the two groups were 498.09+/-153.99 and 535.6+/-181.08 km, respectively (P=0.56). When average ketone value was compared, excluding runners who did not complete the race, the ketone group (5.88+/-1.37) remained statistically different from the non-ketone group (0.2+/-0.45) (P<0.05). The average distances for those athletes who completed the race were 583.9+/-116.09 and 557.8+/-85.82 km, respectively (P=0.52). CONCLUSION We conclude that although two runner sub-populations were revealed, runners who produce ketones and runners who do not make ketones, the level of ketones produced did not affect overall distance run, which is the performance criterion of the race. The nature of this extreme event has illuminated a physiologic difference among ultra marathon runners, and although this difference does not appear to affect race performance, the long-term health consequences are unknown and additional rigorous research is warranted.
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Affiliation(s)
- J Weibel
- Department of Family Medicine, University of Wisconsin, Appleton, WI, USA.
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Brinton MA, Gavin EI, Weibel J. Detection of viral-specific nucleic acid and intracellular virions in ventral horn neurons of lactate dehydrogenase-elevating virus infected C58 mice. Microb Pathog 1986; 1:595-602. [PMID: 3508501 DOI: 10.1016/0882-4010(86)90044-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
C58 mice which have been immunosuppressed by treatment with cyclophosphamide (200 mg/kg) one day prior to infection with the C strain of lactate dehydrogenase-elevating virus (LDV-C) develop poliomyelitis. Using in situ hybridisation, we found that some ventral horn neurons in these mice contain cytoplasmic viral-specific nucleic acid. Viral-specific nucleic acid was also found within a few small cells located near inflammatory foci. In addition, mature virus particles were observed by electron microscopy in some ventral horn neurons, indicating that these cells are productively infected in C58 mice. Neither viral nucleic acid nor virions were found in the ventral horn neurons of poliomyelitis-resistant mouse strains or C58 mice that were not immunosuppressed prior to infection. Ventral horn neurons which contained viral nucleic acid or virions within cytoplasmic vesicles generally were normal in appearance and were not located within poliomyelitis inflammatory foci. Our data are consistent with the hypothesis that infected neurons first replicate virus and subsequently are attacked and cleared by inflammatory cells.
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Kozbor D, Abramow-Newerly W, Tripputi P, Cole SP, Weibel J, Roder JC, Croce CM. Specific immunoglobulin production and enhanced tumorigenicity following ascites growth of human hybridomas. J Immunol Methods 1985; 81:31-42. [PMID: 4020147 DOI: 10.1016/0022-1759(85)90119-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Human X human hybridomas constructed with the B6 lymphoblastoid clone, which produces antitetanus toxoid (TT) antibody, and the lymphoblastoid cell line KR-4 or human hybrid myeloma KR-12, were adapted to growth as ascites in pristane-treated BALB/c nude mice by a single prior passage as a solid subcutaneous (s.c.) tumor in irradiated nude mice followed by in vitro culture. Both B6 X KR-4 and B6 X KR-12 hybrids produced anti-TT antibody and phenotypically resembled the lymphoblastoid KR-4, or the hybrid myeloma KR-12 parent, respectively. Growth as ascites increased the tumorigenicity of both hybrids in nude mice as measured by tumor incidence and rate of tumor growth. The observed increase in tumorigenicity of these hybrid cells after ascites growth was associated with a substantial loss of chromosomes. Passage of the B6 X KR-4 lymphoblastoid hybrid resulted in several reversible morphological changes characteristic of myeloma cells. These changes correlated with increased human Ig production. These observations provide a system for greatly amplifying human monoclonal antibody production.
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Stroop WG, Weibel J, Schaefer D, Brinton MA. Ultrastructural and immunofluorescent studies of acute and chronic lactate dehydrogenase elevating virus-induced nonparalytic poliomyelitis in mice. Proc Soc Exp Biol Med 1985; 178:261-74. [PMID: 3881772 DOI: 10.3181/00379727-178-42009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Light microscopic, electron microscopic, and immunofluorescent studies have been performed on young C58/J mice following administration of cyclophosphamide and peripheral inoculation of the C strain of lactate dehydrogenase-elevating virus (LDV-C). Using special fixation techniques, all three types of studies were performed on the spinal cord tissues obtained from the same mice. LDV-C infection-specific immunofluorescence was detected in anterior horn neurons. Ultrastructurally, anterior horn neurons during the acute inflammatory phase of the disease were characterized by various degrees of chromatolysis, an increase in the number of lamellar inclusion bodies, and extensive membrane proliferation of perinuclear endocytoplasmic reticulum. A chronic vacuolar appearance of the anterior horn was due to intraneuronal vacuolation as well as vacuolation of the neuropil; these changes may have been due to expansion of proliferated intracytoplasmic membranes and/or focal ischemia secondary to the acute inflammatory response. Direct evidence was obtained that indicated the cytopathology was not immune mediated in that highly poliomyelitis-susceptible 18-month-old C58/J mice developed severe paralysis without inflammation of the spinal cord when treated with cyclophosphamide before infection.
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Swift BL, Craddock F, Hancock HA, Jensen R, Thomas GM, Trueblood MS, Weibel J. Ram epididymitis: A clinical report. Theriogenology 1982; 17:343-7. [PMID: 16725695 DOI: 10.1016/0093-691x(82)90094-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/1981] [Accepted: 01/14/1982] [Indexed: 11/19/2022]
Abstract
Two hundred and five ram lambs originating from several sources were assembled for a ram performance trial. All rams were immunized with a commercial Brucella ovis bacterin. Four rams developed clinical evidence of epididymitis during the 150 day trial. Actinobacillus seminis was identified as the causative agent.
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Affiliation(s)
- B L Swift
- Division of Microbiology and Veterinary Medicine Larmie, Wyoming 82071 USA; Division of Animal Science University of Wyoming Laramie, Wyoming 82071 USA
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Mullin JM, Weibel J, Diamond L, Kleinzeller A. Sugar transport in the LLC-PK1 renal epithelial cell line: similarity to mammalian kidney and the influence of cell density. J Cell Physiol 1980; 104:375-89. [PMID: 7419610 DOI: 10.1002/jcp.1041040311] [Citation(s) in RCA: 143] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Cells of confluent cultures of the established pig renal epithelial line, LLC-PK1, accumulate alpha-methyl-D-glucoside against a concentration gradient. This transport system is strongly inhibited by phlorizin and 6-deoxy-D-glucose, moderately inhibited by phloretin, and only weakly inhibited by 3-0-methyl-D-glucose, paralleling the situation in mammalian kidney. The time courses for the uptake of alpha-methyl-D-glucoside and for the carrier-mediated but passive uptake of 3-0-methyl-D-glucose are identical to those seen in mammalian kidney. Subconfluent cultures of LLC-PK1 cells are unable to accumulate alpha-methyl-D-glucoside, and their transport of this glucose analog is less sensitive to phlorizin inhibition than is the transport system in confluent cultures. Transmission electron micrographs show that cells from subconfluent cultures lack the microvillous surface seen in cells from confluent cultures. Cell density is thus a factor in the occurrence of structural and functional differentiated properties related to transport in these cells.
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Abstract
The effects of bromodeoxyuridine (BrdUrd) on the growth, morphology, and tumorigenicity of the spontaneously transformed rat liver cell line R72/3 were studied. These cells grow either in suspension or in a monolayer and are tumorigenic. In monolayer cultures, cells treated with low concentrations (2.5 micrograms/ml) of BrdUrd were larger, more spread out, and more firmly attached to the substratum than were untreated controls. Treated cells failed to grow in suspension or on confluent monolayers of 3T3 cells and did not form colonies in soft agar. Scanning electron microscopy revealed extensive flattening of treated cells and a dramatic reduction in the number of microvilli on the cell surface. Transmission electron microscopy showed an increase in polyribosomes and rough endoplasmic reticulum, as well as an enlargement of endoplasmic reticulum cisternae and a complete absence of the bundles of intermediate size filaments that were conspicuous in untreated cells. The persistence of these changes required the continuous presence of BrdUrd in the medium. The effects of BrdUrd were readily reversed by withdrawal of BrdUrd and were not expressed in the presence of excess thymidine.
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Maul GG, Steplewski Z, Weibel J, Koprowski H. Time sequence and morphological evaluations of cells fused by polyethylene glycol 6000(1). In Vitro 1976; 12:787-96. [PMID: 1035582 DOI: 10.1007/bf02835453] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Mouse L cells (clone 1D) were fused with polyethylene glycol (PEG). The fusion sequence was determined by using sequential light microscopy of the same group of cells, scanning electron microscopy (SEM),transmission electron microscopy, and freeze-etching. The cells were found to fuse only 1 min after PEG had been washed off at small localized areas. Larger fusion images were found after 3 min. Intramembrane particles were observed to have a tendency to aggregate after PEG treatment, but a direct correlation of this activity with the fusion process could not be made. No pathological changes were noted at longer times after PEG removal, except for the extensive widening of the rough-surfaced endoplasmic reticulum (RER) in some cells. It is proposed that fusion does not occur if apposing cells have many microvilli at the area of apparent contact.
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Pfeiffer CJ, Weibel J. The gastric mucosal response to acetylsalicylic acid in the ferret. An ultrastructural study. Am J Dig Dis 1973; 18:834-46. [PMID: 4542656 DOI: 10.1007/bf01073333] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Rubinstein LJ, Herman MM, Miquel J, Weibel J. The short- and long-term effects of ultraviolet irradiation on the exposed cat cerebrum. Light-microscopic, enzyme-histochemical and fine-structural observations. J Neurol Sci 1971; 13:351-75. [PMID: 4256173 DOI: 10.1016/0022-510x(71)90038-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Ishiyama E, Keels EW, Weibel J. New anatomical aspects of the vasculo-epithelial zone of the spiral limbus in mammals. An electron microscopic study. Acta Otolaryngol 1970; 70:319-28. [PMID: 5505127 DOI: 10.3109/00016487009181892] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Ishiyama E, Weibel J, Keels EW, Richardson TL. Ultrastructure of the interdental cells in mammals. Pract Otorhinolaryngol (Basel) 1970; 32:321-34. [PMID: 4928764 DOI: 10.1159/000274956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Based on ultrastructural evidence of the interdental cells from guinea pig, cat and human the authors suggest that the function of interdental cells is to take up a material from the spiral limbus by pinocytosis and transport it via the vesicular channels of the endoplasmic reticulum to the Golgi apparatus until it is secreted into the tectorial membrane.
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Pfeiffer CJ, Weibel J. The antral clear cell--a new cell type discovered in the pyloric-antral mucosa of the ferret. J Ultrastruct Res 1969; 29:550-62. [PMID: 5365375 DOI: 10.1016/s0022-5320(69)90073-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Philpott DE, Weibel J, Atlan H, Miquel J. Viruslike particles in the fat body, oenocytes, and central nervous tissue of Drosophila melanogaster imagoes. J Invertebr Pathol 1969; 14:31-8. [PMID: 5804152 DOI: 10.1016/0022-2011(69)90007-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Abstract
A crude small particle pellet, obtained from postmitochondrial supernatant fractions of Saccharomyces cerevisiae, contains about half the ergosterol and phospholipid of crude cell homogenates. Most of the phospholipid of this pellet is in a "heavy" fraction which, with the aid of electron microscopy, shows membranous elements in addition to discrete particles. The "heavy" fraction, upon treatment with deoxycholate, can be freed of membranes, or, with ribonuclease treatment, ribosomes can be removed, leaving relatively clean membranes. The "heavy" fraction resembles the microsomes of animal cells, but contains considerably less lipids, including phospholipids, thus suggesting a less well-developed intracellular membrane system.
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Fields WS, Bruetman ME, Weibel J. Collateral circulation of the brain. Monogr Surg Sci 1965; 2:183-259. [PMID: 5318328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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