276
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Atabek U, Mayer D, Amin A, Camishion RC. Pancreatic cystogastrostomy by combined upper endoscopy and percutaneous transgastric instrumentation. JOURNAL OF LAPAROENDOSCOPIC SURGERY 1993; 3:501-4. [PMID: 8251667 DOI: 10.1089/lps.1993.3.501] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Minimally invasive endoscopic and radiologic techniques have been reported for internal gastric drainage of pancreatic pseudocysts but these have significant technical limitations. A purely endoscopic approach to cystogastrostomy provides limited access for instrumentation and hemostasis. Radiologically-guided percutaneous techniques cannot regularly provide an adequately wide cystogastrostomy opening. Reported is a patient who had a pancreatic cystogastrostomy performed using a minimally invasive surgical approach combining upper endoscopy and percutaneous transgastric surgical instrumentation. The upper endoscope essentially served as a camera. A percutaneous endoscopic gastrostomy tube served as a port for inserting laparoscopic instruments into the stomach. The laparoscopic instruments were used to create a 1.5 cm cystogastrostomy opening similar in size to what could be created by an open abdominal approach. The laparoscopy instruments provided good tactile feedback and excellent hemostatic control. Avoiding an open abdominal procedure shortened postoperative recovery and reduced patient discomfort. Although the pseudocyst recurred once, the same procedure was performed again and there has not been a recurrence for 10 months. The authors conclude that this minimally invasive surgical procedure provides an excellent alternative approach for internal drainage of selected pancreatic pseudocysts.
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277
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Pan ZQ, Amin A, Hurwitz J. Characterization of the in vitro reconstituted cyclin A or B1-dependent cdk2 and cdc2 kinase activities. J Biol Chem 1993; 268:20443-51. [PMID: 8397207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Human cyclins A and B1 were assembled with the cdk2 or cdc2 protein to reconstitute their respective kinase activities in vitro. Both cyclins complemented either cdk2 or cdc2, yielding kinase activities that supported the phosphorylation of histone H1. Activation of cdk2-catalyzed H1 kinase activity by cyclin A required a 10-min preincubation of the two components, whereas cdc2 kinase supported phosphate incorporation without a detectable time lag upon the addition of cyclin B1, suggesting a slower association rate of cdk2 with cyclin A compared with cdc2 and cyclin B1. Both cdk2 and cyclin A, as well as cdc2 and cyclin B1, formed stable complexes in the absence of ATP and substrate that could be isolated after glycerol gradient centrifugation. Incubation of the isolated complexes with ATP and histone H1 supported the phosphorylation of the substrate. Cyclin A-activated cdk2 or cdc2 phosphorylated p107, a pRB-related cellular protein, 10 times more effectively than the cyclin B1-complexed kinases. This was most likely due to a direct association of cyclin A with p107 (Ewen, M. E., Faha, B., Harlow, E., and Livingston, D. (1992) Science 255, 85-87; Faha, B., Ewen, M. E., Tsai, L.-H., Livingston, D., and Harlow, E. (1992) Science 255, 87-90). The reconstituted cdc2-cyclin B1 complex incorporated 4-5-fold more phosphate into the p34 subunit of the three-subunit (p70, p34, and p14) human single-stranded DNA-binding protein (also called RP-A), a DNA replication and DNA repair factor, than cdc2-cyclin A. No detectable phosphorylation of the p34 protein was observed with cdk2 complexed with either cyclin B1 or A. These data indicate that both cyclins as well as the catalytic subunits are important factors in controlling the rate of phosphorylation of a given substrate. The cyclin-activated cdc2 family kinases may target their cellular substrates through cyclin-mediated protein-protein interactions.
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278
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Pan Z, Amin A, Hurwitz J. Characterization of the in vitro reconstituted cyclin A or B1-dependent cdk2 and cdc2 kinase activities. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(20)80747-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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279
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Amin A, Alexander JB, O'Malley KF, Doolin E. Blunt abdominal aortic trauma in children: case report. THE JOURNAL OF TRAUMA 1993; 34:293-6. [PMID: 8459474 DOI: 10.1097/00005373-199302000-00022] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Injuries to the abdominal aorta as a result of blunt trauma in children are extremely rare. We encountered one such injury and a review of the literature revealed seven additional cases. Lower extremity ischemia, abdominal bruit, or paraplegia may suggest that diagnosis at the time of injury. Delayed presentations are characterized by abdominal pain or a pulsatile mass, with or without bruit. A high index of suspicion with early aortography is indicated to diagnose blunt aortic trauma.
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280
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Waterman AE, Amin A. The influence of surgery and anaesthesia on the pharmacokinetics of pethidine in the horse. Equine Vet J 1992:56-8. [PMID: 9109962 DOI: 10.1111/j.2042-3306.1992.tb04774.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The plasma concentration of pethidine was measured in 16 horses, after its administration intravenously (i.v.) at a dose rate of 1 mg/kg bodyweight (bwt). In eight animals studied before surgery, the plasma levels of the drug decreased in a bi-exponential manner with a distributive half life of 3 mins and an elimination half life of 57.7 mins. Total body clearance was 17.7 ml/kg bwt/min. The remaining horses were investigated immediately after a period of anaesthesia and surgery and in these animals the drug exhibited smaller volumes of distribution (V1 cand Vdarea) and a significantly lower clearance rate of 12.8 ml/kg bwt/min in these animals. Correlation between the plasma concentration of pethidine and information published previously on the duration of action of the agent in the horses suggests that plasma levels of approximately 0.4 microgram/ml are required to produce analgesia in this species.
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281
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Quattrocchi KB, Frank EH, Miller CH, Amin A, Issel BW, Wagner FC. Impairment of helper T-cell function and lymphokine-activated killer cytotoxicity following severe head injury. J Neurosurg 1991; 75:766-73. [PMID: 1833515 DOI: 10.3171/jns.1991.75.5.0766] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Infection is a major complication of severe head injury, occurring in 50% to 75% of patients who survive to hospitalization. Previous investigations of immune activity following head injury have demonstrated suppression of helper T-cell activation. In this study, the in vitro production of interferon-gamma (INF-gamma), interleukin-1 (IL-1), and interleukin-2 (IL-2) was determined in 25 head-injured patients following incubation of peripheral blood lymphocytes (PBL's) with the lymphocyte mitogen phytohemagglutin (PHA). In order to elucidate the functional status of cellular cytotoxicity, lymphokine-activated killer (LAK) cell cytotoxicity assays were performed both prior to and following incubation of PBL's with IL-2 in five patients with severe head injury. The production of INF-gamma and IL-2 by PHA-stimulated PBL's was maximally depressed within 24 hours of injury (p less than 0.001 for INF-gamma, p = 0.035 for IL-2) and partially normalized within 21 days of injury. There was no change in the production of IL-1. When comparing the in vitro LAK cell cytotoxicity of PBL's from head-injured patients and normal subjects, there was a significant depression in LAK cell cytotoxicity both prior to (p = 0.010) and following (p less than 0.001) incubation of PBL's with IL-2. The results of this study indicate that IL-2 and INF-gamma production, normally required for inducing cell-mediated immunity, is suppressed following severe head injury. The failure of IL-2 to enhance LAK cell cytotoxicity suggest that factors other than decreased IL-2 production, such as inhibitory soluble mediators or suppressor lymphocytes, may be responsible for the reduction in cellular immune activity following severe head injury. These findings may have significant implications in designing clinical studies aimed at reducing the incidence of infection following severe head injury.
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282
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Amin A, Roca H, Luetke K, Sadowski PD. Synapsis, strand scission, and strand exchange induced by the FLP recombinase: analysis with half-FRT sites. Mol Cell Biol 1991; 11:4497-508. [PMID: 1875935 PMCID: PMC361321 DOI: 10.1128/mcb.11.9.4497-4508.1991] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We have used a previously described cross-linking assay and half-FRT site substrates to examine the requirements for synapsis, strand exchange, and strand scission. The cross-linking assay showed that the minimum functional FRT site needed for synapsis contains two inverted FLP-binding elements surrounding an 8-bp core. This indicates that four FLP molecules interact with four binding elements in a synaptic complex. The analysis using half-sites showed that the enzyme can catalyze efficient strand exchange between a half-site and the intact FRT site. The reaction occurred only if the half-site had at least 2 bp but no more than 4 bp of the adjoining core sequence. The exchange occurred exclusively at the regions of limited core homology between the respective half-site and the FRT site. The absence of strand exchange between an intact site and a half-site bearing regions of core nonhomology indicates that 1 bp of homology is not sufficient for the formation of stable recombinant structures. Qian et al. (X.-H. Qian, R. B. Inman, and M. M. Cox, J. Biol. Chem. 265:21779-21788, 1990) have recently shown that the FLP protein can catalyze the formation of dimeric, trimeric, and tetrameric complexes with half-FRT sites. We show that only half-sites that contained at least 2 bp of adjacent core could form stable dimer products and be cleaved by the enzyme. Stable dimers were formed between a noncleavable half-site and a cleavable half-site, suggesting that only a single cleavage event is needed for the formation of the dimer.
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283
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Waterman AE, Livingston A, Amin A. Further studies on the antinociceptive activity and respiratory effects of buprenorphine in sheep. J Vet Pharmacol Ther 1991; 14:230-4. [PMID: 1744931 DOI: 10.1111/j.1365-2885.1991.tb00831.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The thermal and mechanical analgesic profile of buprenorphine at a dose rate of 1.5 micrograms/kg i.v. was investigated in five sheep. This dose produced significant analgesia for 40 min against the thermal stimulus, but no mechanical antinociception. A higher dose rate of 12 micrograms/kg also failed to produce antinociception to a mechanical stimulus. In addition, the effect of the drug (6 micrograms/kg) on respiratory gas tensions was determined and no significant changes were observed.
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284
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Waterman AE, Livingston A, Amin A. Analgesic activity and respiratory effects of butorphanol in sheep. Res Vet Sci 1991; 51:19-23. [PMID: 1910200 DOI: 10.1016/0034-5288(91)90024-i] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The analgesic drug butorphanol tartrate has proved useful clinically in horses and dogs but its analgesic profile had not yet been investigated in sheep. This study was initiated to determine the thermal and mechanical antinociceptive activity of butorphanol (at the dose rates 0.05, 0.1 and 0.2 mg kg-1) in sheep. The drug produced significant analgesia in the thermal test system, the duration of which was dose related but no significant elevation in mechanical pressure thresholds could be detected. In a further set of experiments the dose rate was increased to 0.4 mg kg-1 and mechanical testing was repeated. There was still no clinically significant elevation in pressure thresholds. At a dose rate of 0.2 mg kg-1 the drug had no detectable effect on respiratory blood gas tensions. Behavioural changes were severe if a dose rate of 0.2 mg kg-1 was exceeded.
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285
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Amin A. Erratum: Phenomenological description of piezoresistivity in semiconducting perovskite ferroelectrics. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 41:4784. [PMID: 9994317 DOI: 10.1103/physrevb.41.4784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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286
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Srinivasan G, Amin A, Pildes RS, Lilien LD, Matalon R. Plasma amino acid patterns in very low birth weight infants during parenteral nutrition. Indian J Pediatr 1990; 57:93-7. [PMID: 2113886 DOI: 10.1007/bf02722138] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Plasma amino acids were measured in eight very low birth weight infants (less than or equal to 1000 gm) before and after infusion of parenteral alimentations with Freamine III. Significant elevation in serum threonine, valine, isoleucine, methionine, serine, proline, glycine and ornithine was noted after twenty four hours of infusion. On the other hand, significant decreases in taurine and tyrosine levels were noted. Our study suggests that current solution is not optimal for premature neonates and the amount of protein administered during the first week in infants weighing less than or equal to 1000 gm should be decreased from the recommended 2.5-3.0 gm/kg/day.
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287
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Waterman A, Livingston A, Amin A. The antinociceptive activity and respiratory effects of fentanyl in sheep. ACTA ACUST UNITED AC 1990. [DOI: 10.1111/j.1467-2995.1990.tb00383.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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288
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Amin A. Numerical computation of the piezoresistivity matrix elements for semiconducting barium titanate. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:11603-11608. [PMID: 9991760 DOI: 10.1103/physrevb.40.11603] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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289
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Amin A. Phenomenological description of piezoresistivity in semiconducting perovskite ferroelectrics. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:4350-4356. [PMID: 9948777 DOI: 10.1103/physrevb.39.4350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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290
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291
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Azmi F, Iqbal J, Rab A, Khan MA, Amin A. Prevalence of anti rubella antibodies in pregnant and prepubertal females--a preliminary study. J PAK MED ASSOC 1987; 37:6-7. [PMID: 3102799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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292
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Pierce JP, Dwyer T, DiGiusto E, Carpenter T, Hannam C, Amin A, Yong C, Sarfaty G, Shaw J, Burke N. Cotinine validation of self-reported smoking in commercially run community surveys. JOURNAL OF CHRONIC DISEASES 1987; 40:689-95. [PMID: 3597671 DOI: 10.1016/0021-9681(87)90105-6] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A validation study was carried out on self-reported smoking for 1177 people in Sydney and Melbourne in 1983. Because of its long half life and the fact that smoking is its only source in body fluids, saliva cotinine was chosen as the validation measure. Cotinine levels above 250 nmol/l were used to classify people as smokers. The sensitivity of self-reported smoking was 92.6% and the specificity was 93.4%. There was some evidence that people in the process of changing their smoking status might be slow in updating their self-classification. The smoking prevalence estimate based on cotinine levels was found to be 1.7% lower than that for self-reported smoking status. The small proportion of false negatives and false positives suggests that commercially collected data banks can be valid sources of prevalence data. Correlation between cotinine level and reported cigarette consumption was not affected by sample volume, and was similar to that achieved for carbon monoxide and thiocyanate at a low 0.34. Regression analysis using self-reported cigarette consumption filter/non-filter cigarettes, and time since last cigarette as predictors, explained 13.6% of the variance in cotinine level.
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293
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Amin A, Newnham RE, Cross LE. Effect of elastic boundary conditions on morphotropic Pb(Zr,Ti)O3 piezoelectrics. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 34:1595-1598. [PMID: 9939806 DOI: 10.1103/physrevb.34.1595] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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294
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Asbell PA, Chiang B, Amin A, Podos SM. Retinal acuity evaluation with the potential acuity meter in glaucoma patients. Ophthalmology 1985; 92:764-7. [PMID: 4034171 DOI: 10.1016/s0161-6420(85)33960-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The potential acuity meter (PAM) is designed to evaluate retinal acuity in the presence of media opacities. We looked at patients with glaucoma but with clear media, and compared best corrected visual acuity with PAM results to see if they produced comparable results. Sixty eyes in 38 glaucoma patients and 20 eyes in 10 normal ocular patients were evaluated. Our results indicate that PAM visual acuity is a reliable indicator of Snellen visual acuity in normal eyes, in eyes with mild to moderate glaucomatous damage, and when PAM visual acuity measurements were better than 20/60. However, when visual field loss is severe and when PAM visual acuity readings were worse than 20/60, the correspondence between these and Snellen visual acuity was erratic. Poor PAM results will not correlate with postoperative visual acuity in patients with advanced glaucoma and cataracts.
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295
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Okeson GC, Amin A, Poppell JW. Office assessment of chronic obstructive lung disease. Tex Med 1983; 79:45-8. [PMID: 6879466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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296
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Amin A, Foster KR, Ternes J, Takashima S. Lack of effect of pulsed ultrasound on the mammalian EEG. AVIATION, SPACE, AND ENVIRONMENTAL MEDICINE 1981; 52:604-7. [PMID: 7295247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Anesthetized rhesus monkeys and rabbits were exposed to pulsed ultrasound, from a 1.8 cm diameter transducer placed against the head. Each ultrasonic exposure lasted 4 min; it consisted of a series of 1-2 mu sec pulses, with a frequency spectrum broadly centered about the transducer resonant frequency of 1.5 MHz, repeated at a rate of 950 Hz. The time averaged ultrasonics power was 12.6 mW, with an estimated peak power of ca. 15 watts. No changes were observed in the EEG or its power spectrum during or immediately after the exposure. This contrasts to a previous report of significant changes in the EEG of squirrel monkeys during comparable exposures to pulsed ultrasound. Analysis of the earlier reported results suggests that some of the "effects" were due to aliasing artifacts.
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297
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Amin A, Newnham R, Cross L, Cox D. Phenomenological and structural study of a low-temperature phase transition in the PbZrO3PbTiO3 system. J SOLID STATE CHEM 1981. [DOI: 10.1016/0022-4596(81)90091-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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298
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299
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Amin A. Gaschromatographische Trennung und Identifizierung von organischen Säuren der Rübenmelasse und des Dattelsirups. ACTA ACUST UNITED AC 1980. [DOI: 10.1002/food.19800240804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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300
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Hosny A, Imam IZ, Sharaan N, Saleh S, Orchan M, El-Senousy A, Amin A. Isolation and identification of influenza virus strain A/duck/England from migrating birds to Egypt. 1976. J Egypt Public Health Assoc 1980; 55:13-22. [PMID: 7341721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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