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Barros OA, Silva JH, Saraiva GD, Viana BC, Paschoal AR, Freire PTC, Oliveira NC, Paula AJ, Viana MS. Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin). PeerJ 2019; 7:e6323. [PMID: 30783565 PMCID: PMC6378090 DOI: 10.7717/peerj.6323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 12/20/2018] [Indexed: 11/30/2022] Open
Abstract
The Ipubi and Romualdo Formations are Cretaceous units of the Araripe Basin (Santana Group). The first and most ancient was deposited in a lake environment, and some fossils were preserved in shales deposited under blackish conditions. The second was deposited in a marine environment, preserving a rich paleontological content in calcareous concretions. Considering that these two environments preserved their fossils under different processes, in this work we investigated the chemical composition of two fossilized specimens, one from each of the studied stratigraphic units, and compared them using vibrational spectroscopy techniques (Raman and IR), X-ray diffraction and large-field energy-dispersive X-ray spectroscopy (EDS) mappings. Calcite was observed as the dominant phase and carbon was observed in the fossils as a byproduct of the decomposition. The preservation of hydroxide calcium phosphate (Ca10(PO4)6(OH)2, hydroxyapatite) was observed in both fossils. In addition, it was observed that there was a smaller amount of pyrite (pyritization) in the Romualdo Formation sample than in the Ipubi one. Large-field EDS measurements showed the major presence of the chemical elements calcium, oxygen, iron, aluminum and fluoride in the Ipubi fossil, indicating a greater influence of inorganic processes in its fossilization. Our results also suggest that the Romualdo Formation fossilization process involved the substitution of the hydroxyl group by fluorine, providing durability to the fossils.
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Affiliation(s)
| | - João Hermínio Silva
- Campus Juazeiro do Norte, Universidade Federal do Cariri, Juazeiro do Norte, Ceará, Brazil
| | - Gilberto Dantas Saraiva
- Faculdade de Educação, Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, Ceará, Brazil
| | | | | | | | | | - Amauri Jardim Paula
- Department of Physics, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil
| | - Maria Somália Viana
- Laboratório de Paleontologia, Museu Dom José, Universidade Estadual do Vale do Acaraú, Sobral, Ceará, Brazil
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Xavier DO, Amaral LS, Gomes MA, Rocha MA, Campos PR, Cota BDCV, Tafuri LSA, Paiva AMR, Silva JH, Andrade SP, Belo AV. Metformin inhibits inflammatory angiogenesis in a murine sponge model. Biomed Pharmacother 2009; 64:220-5. [PMID: 20053525 DOI: 10.1016/j.biopha.2009.08.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Accepted: 08/24/2009] [Indexed: 12/16/2022] Open
Abstract
To investigate the effects of metformin on angiogenesis, on inflammatory cell accumulation and on production of endogenous cytokines in sponge implant in mice. Polyester-polyurethane sponges were implanted in Swiss mice and metformin (40 or 400mg/kg/day) was given orally for six days. The implants collected at day 7 postimplantation were processed for the assessment of hemoglobin (Hb), myeloperoxidase (MPO), N-acetylglucosaminidase (NAG) e collagen used as indexes for angiogenesis, neutrophil and macrophage accumulation and extracellular matrix deposition, respectively. Relevant inflammatory, angiogenic and fibrogenic cytokines were also determined. Metformin treatment attenuated the main components of the fibrovascular tissue, wet weight, vascularization (Hb content), macrophage recruitment (NAG activity), collagen deposition and the levels of transforming growth factor (TGF-beta1) intraimplant. A regulatory function of metformin on multiple parameters of main components of inflammatory angiogenesis has been revealed giving insight into the potential therapeutic underlying the actions of metformin.
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Affiliation(s)
- D O Xavier
- FUMEC University, Physiology, Rua da Paisagem 240, Bairro Vila da Serra, Nova Lima, Minas Gerais, Brazil
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Gama-Rodrigues JJ, Silva JH, Aisaka AA, Jureidini R, Falci R, Maluf Filho F, Chong AK, Tsai AW, Bresciani C. Intestinal intussusception and occlusion caused by small bowel polyps in the Peutz-Jeghers syndrome. Management by combined intraoperative enteroscopy and resection through minimal enterostomy: case report. Rev Hosp Clin Fac Med Sao Paulo 2000; 55:219-24. [PMID: 11313662 DOI: 10.1590/s0041-87812000000600005] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
UNLABELLED The Peutz-Jeghers syndrome is a hereditary disease that requires frequent endoscopic and surgical intervention, leading to secondary complications such as short bowel syndrome. CASE REPORT This paper reports on a 15-year-old male patient with a family history of the disease, who underwent surgery for treatment of an intestinal occlusion due to a small intestine intussusception. DISCUSSION An intra-operative fiberscopic procedure was included for the detection and treatment of numerous polyps distributed along the small intestine. Enterotomy was performed to treat only the larger polyps, therefore limiting the intestinal resection to smaller segments. The postoperative follow-up was uneventful. CONCLUSION We point out the importance of conservative treatment for patients with this syndrome, especially those who will undergo repeated surgical interventions because of clinical manifestation while they are still young.
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Affiliation(s)
- J J Gama-Rodrigues
- Department of Gastroenterology, Hospital das Clínicas, Faculty of Medicine, University of São Paulo
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Shua-Haim JR, Ross JS, Cunha UG, Silva JH. Geriatrics photo quiz. Chagas disease. Geriatrics (Basel) 1999; 54:19, 58-60. [PMID: 10542856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Affiliation(s)
- J R Shua-Haim
- University of Medicine and Dentistry of New Jersey, Center for Aging, Stratford, USA
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Abstract
A case of larva migrans or serpiginous linear dermatitis on the scalp of a teenager is reported. An ancylostomid larva was found within a sebaceous gland acinus. The unusual skin site for larva migrans as well as the penetration through the sebaceous gland are highlighted. The probable mechanism by which the parasite reached the skin adnexa is discussed.
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Affiliation(s)
- L C Guimarães
- Faculdade de Medicina do Triângulo Mineiro, Hospital Hélio Angotti (Associação de Combate ao Câncer do Brasil Central), Universidade de Uberaba, MG
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Bonamigo TP, Silva JH, Siliprandi LR. Ruptured abdominal aortic aneurysm. Analysis of 50 procedures. INT ANGIOL 1991; 10:133-40. [PMID: 1765714] [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: 12/28/2022]
Abstract
The authors report their experience in the management of 50 patients operated on for ruptured abdominal aortic aneurysms. The importance of an early surgical indication will be discussed. A didactically written chart will be presented to simplify and allow early diagnosis. The results will be analysed as to onset of rupture, quantity of transfused blood and shock condition of the patient.
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Cowan WD, Slobodnik AR, Roberts GA, Silva JH. A 300-MHz digitally compensated SAW oscillator. IEEE Trans Ultrason Ferroelectr Freq Control 1988; 35:380-385. [PMID: 18290163 DOI: 10.1109/58.20458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A method for compensating for the inherent temperature sensitivity of surface-acoustic-wave (SAW) oscillators is described. Results for a 300-MHz digitally compensated SAW oscillator (DCSO) show a reduction of temperature-induced frequency variation from +/-125 parts per million to +/-1.4 parts per million over the temperature range of -23 to 75 degrees C. This is accomplished using simple digital circuitry and microprocessor control. The temperature-sensing scheme, using a SAW structure with two delay paths of different temperature sensitivity on the same AT-cut quartz substrate, virtually eliminates thermal resistance and time-constant problems. Advantages over ovenized systems include fast warmup; reduced size, weight, and power dissipation; low cost potential; and the ability to compensate for other sources of frequency drift.
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Affiliation(s)
- W D Cowan
- Rome Air Dev. Center, Hanscom AFB, MA
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Thaxter JB, Carr PH, Silva JH. Propagation of transverse bulk and surface acoustic waves in LiNbO (3) variable time-delay devices. IEEE Trans Ultrason Ferroelectr Freq Control 1988; 35:525-530. [PMID: 18290183 DOI: 10.1109/58.8029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Experimental measurements are reported on voltage-controlled acoustic time-delay lines operating at 1 GHz in the nearly pure shear-horizontal (S-H) mode in 38 degrees rotated Y-cut LiNbO(3). The high-acoustic velocity (4800 m/s) in conjunction with the large electroacoustic effect exhibited by this orientation allows high-frequency operation and optimum time-delay tuning sensitivity with a planar, single surface, device geometry. The authors demonstrate fractional time delay of 0.3x10(-6) V(-1 ) for surface electrodes that produce an in-plane E-field. However, the simultaneous excitation and propagation of both a leaky surface-acoustic wave (LSAW) and surface skimming bulk wave (SSBW), both as (nearly pure) S-H waves in these devices, seriously restricts the extent to which it is possible to maximize the time delay modulation sensitivity by reducing electrode gap spacing as done in similar SAW devices. The LSAW and surface-skimming body wave (SSBW) propagate at nearly the same velocity on a free surface, and perturbation of their velocity and relative attenuation rates by surface electrodes causes pronounced interference effects between the two modes for some device geometries.
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Abstract
A cubic dependence of frequency on temperature has been experimentally observed for surface-acoustic-wave (SAW) delay lines fabricated on X-cut quartz. The SAWs propagate on the X-cut surface in a direction between the positive Y direction and the Z direction, 33.44 degrees from the +Y axis. An experimental system is described for measuring the temperature sensitivity of the delay lines. The measurements show that the relative position of the delay-line transducers has a strong influence on both the frequency versus temperature curve and the insertion loss versus temperature curve.
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Cutait R, Calache JE, Lourenção JL, Borges JL, Manzione A, Kiss DR, Silva JH, Cutait DE. [Polypectomy by colonoscopy; indications, technic and results]. AMB Rev Assoc Med Bras 1981; 27:157-62. [PMID: 6976598] [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: 01/22/2023]
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