176
|
Blaker K, Sahoo S, Schweichler M, Chagpar A. QS116. Malignant Phylloides Tumor in the First Trimester of Pregnancy. J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.412] [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]
|
177
|
Kothari H, Kaur G, Sahoo S, Idell S, Rao LVM, Pendurthi U. Plasmin enhances cell surface tissue factor activity in mesothelial and endothelial cells. J Thromb Haemost 2009; 7:121-31. [PMID: 18983492 PMCID: PMC2605520 DOI: 10.1111/j.1538-7836.2008.03218.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Mesothelial cells that line the thoracic cavity play an important role in maintaining the local balance between procoagulant and fibrinolytic activity, a role akin to the endothelial cells in blood vessels. The mechanism(s) responsible for increased tissue factor (TF) expression in mesothelial cells in response to injury are at present unclear. OBJECTIVE To investigate whether plasmin or thrombin, two major proteases that may be generated on the pleural surface upon injury, induce TF expression in human pleural mesothelial cells (HMC) and elucidate the underlying mechanism(s). METHODS Confluent monolayers of HMC and human umbilical vein endothelial cells (HUVEC) were exposed to plasmin or thrombin for varying time periods and TF expression was analyzed by measuring its activity in a factor Xa generation assay, TF antigen levels by immunoblot analysis and TF mRNA by Northern blot analysis. RESULTS Both plasmin and thrombin treatments increased cell surface TF activity in HMC by 3- to 4-fold. In contrast to thrombin, plasmin-induced TF activity is not dependent on the de novo synthesis of TF. In HUVEC, plasmin had a minimal effect on unperturbed HUVEC whereas it markedly increased TF activity of activated HUVEC. Plasmin treatment neither affected anionic phospholipid levels at the cell surface nor released protein disulfide isomerase, an oxidoreductase protein that was newly described to play a role in TF activation. Plasmin cleaved cell-associated TFPI. CONCLUSION Thrombin up-regulates TF activity in HMC through the transcriptional activation of TF whereas plasmin increases TF activity by inactivating the cell-associated TFPI by a limited proteolysis.
Collapse
|
178
|
García Saiz E, Gregori G, Khattak FY, Kohanoff J, Sahoo S, Naz GS, Bandyopadhyay S, Notley M, Weber RL, Riley D. Evidence of short-range screening in shock-compressed aluminum plasma. PHYSICAL REVIEW LETTERS 2008; 101:075003. [PMID: 18764546 DOI: 10.1103/physrevlett.101.075003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2008] [Indexed: 05/26/2023]
Abstract
We have investigated the angular variation in elastic x-ray scattering from a dense, laser-shock-compressed aluminum foil. A comparison of the experiment with simulations using an embedded atom potential in a molecular dynamics simulation shows a significantly better agreement than simulations based on an unscreened one-component plasma model. These data illustrate, experimentally, the importance of screening for the dense plasma static structure factor.
Collapse
|
179
|
Sahoo S, Tizon B, Figliola M, Levy E. O1‐03–08: Multiple mechanisms of neuroprotection by cystatin C: Inhibition of Aβ deposition, induction of autophagy, and induction of proliferation. Alzheimers Dement 2008. [DOI: 10.1016/j.jalz.2008.05.236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
180
|
Polisetty S, Scheffler J, Sahoo S, Wang Y, Mukherjee T, He X, Binek C. Optimization of magneto-optical Kerr setup: analyzing experimental assemblies using Jones matrix formalism. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:055107. [PMID: 18513092 DOI: 10.1063/1.2932445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present a comparative study on an experimental and theoretical optimization of magneto-optical Kerr setups based on photoelastic modulation and phase sensitive detector methodology. The first and second harmonics, I omega,2 omega, of the reflected light intensity are measured for a CoO/Co magnetic reference film. The magnetic field dependence of the optical off-diagonal Fresnel reflection coefficients rps and rsp follows the sample magnetization. Different Kerr setups provide various dependencies of I omega,2 omega on the reflection coefficients and, hence, on the Kerr ellipticity epsilon K and rotation theta K. Jones matrix formalism has been used to analyze the impact of a systematic variation of relative analyzer and polarizer orientations with respect to each other and with respect to the retardation axis of the modulator involved in longitudinal Kerr setups for incoming s-polarized light. We find one particular setup which maximizes I(omega) as well as I2 omega and maximizes the signal-to-noise ratio. Inefficient setups are characterized by I omega,2 omega intensities involving large nonmagnetic contributions of rp and rs.
Collapse
|
181
|
Sahoo S, Gribakin GF, Shabbir Naz G, Kohanoff J, Riley D. Compton scatter profiles for warm dense matter. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:046402. [PMID: 18517740 DOI: 10.1103/physreve.77.046402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Indexed: 05/26/2023]
Abstract
In this paper, we discuss the possibility of using x-ray Compton scattering as a probe of the outer electronic structure of ions immersed in warm dense matter. It is proposed that the x-ray free-electron lasers currently under construction will provide an ideal tool for this, with the main pulse being used to create a uniform well-defined sample and the third harmonic providing a clean monochromatic probe. We model the plasma photon scatter spectrum by combining self-consistent finite-temperature electronic structure calculations with molecular dynamics simulations of the ion-ion structure factor. In particular, we present bound-free Compton profiles that are more accurate that those obtained using form factor or impulse approximations.
Collapse
|
182
|
Sahoo S, Panda PK, Mishra SR, Nayak A, Dash SK, Ellaiah P. Optimization of physical and nutritional parameters for hyaluronidase production by <i> Streptococcus mitis</i>. Indian J Pharm Sci 2008; 70:661-4. [PMID: 21394270 PMCID: PMC3038298 DOI: 10.4103/0250-474x.45412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2007] [Revised: 03/17/2008] [Accepted: 10/13/2008] [Indexed: 11/07/2022] Open
Abstract
The effect of some physical and nutritional parameters were studied for the optimum production of extracellular enzyme hyaluronidase employing Streptococcus mitis MTCC*2695 by submerged fermentation. The effects of initial pH, incubation temperature and time, inoculum level and age of inoculum were studied. The maximum enzymatic activity was obtained with an initial pH 5.8, incubation temperature 37°, incubation time for 48 h and inoculum level 6% with inoculum age 24 h. The effect of different carbon and nitrogen sources and antibiotics were studied. The results indicated that sucrose and ammonium chloride showed the highest enzymatic activity among various carbon and nitrogen sources. Antibiotic clarithromycin showed strong inhibitory effect on hyaluronidase production.
Collapse
|
183
|
Sahoo S, Alatassi H, Bernstein M, Slone SP, Chagpar AB. Breast carcinoma metastatic to ameloblastoma: a unique tumour-to-tumour metastasis. Histopathology 2007; 50:815-7. [PMID: 17493244 DOI: 10.1111/j.1365-2559.2007.02642.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]
|
184
|
Sahoo S, Rao KK, Suraishkumar GK. Reactive oxygen species induced by shear stress mediate cell death in Bacillus subtilis. Biotechnol Bioeng 2006; 94:118-27. [PMID: 16570320 DOI: 10.1002/bit.20835] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Exposure of Bacillus subtilis to a shear rate of 1,482/s leads to a rapid loss of cell viability after 10 h of growth. Biochemical and molecular evidences provided below strongly suggest that cell death under high shear results from an apoptosis-like process similar to that described in eukaryotes, with activation of a caspase-3-like protease (C(3)LP) followed by DNA fragmentation. Shear stress leads to an increase in specific intracellular reactive oxygen species (siROS), possibly through activation of NADH oxidase (NOX). The formation of siROS precedes the activation of C(3)LP and DNA fragmentation, thus establishing siROS as the molecular link between shear stress and apoptosis-like cell death. A model is proposed in which NOX is viewed as being strategically placed on the plasma membrane of B. subtilis that senses and converts a mechanical force arising from shear stress into a chemical signal leading to activation of C(3)LP, DNA fragmentation, and thus, apoptosis-like cell death.
Collapse
|
185
|
Sahoo S, Kar DM, Mohapatra S, Rout SP, Dash SK. Antibacterial activity ofHybanthus enneaspermusagainst selected urinary tract pathogens. Indian J Pharm Sci 2006. [DOI: 10.4103/0250-474x.29640] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
186
|
Sahoo S, Ouyang H, Goh JCH, Tay TE, Toh SL. Characterization of a Novel Polymeric Scaffold for Potential Application in Tendon/Ligament Tissue Engineering. ACTA ACUST UNITED AC 2006; 12:91-9. [PMID: 16499446 DOI: 10.1089/ten.2006.12.91] [Citation(s) in RCA: 192] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Unlike braided fabrics, knitted scaffolds have been proven to favor deposition of collagenous connective tissue matrix, which is crucial for tendon/ligament reconstruction. But cell seeding of such scaffolds often requires a gel system, which is unstable in a dynamic situation, especially in the knee joint. This study developed a novel, biodegradable nano-microfibrous polymer scaffold by electrospinning PLGA nanofibers onto a knitted PLGA scaffold in order to provide a large biomimetic surface for cell attachment. Porcine bone marrow stromal cells were seeded onto either the novel scaffolds by pipetting a cell suspension (Group I) or the knitted PLGA scaffolds by immobilizing in fibrin gel (Group II). Cell attachment at 36 hours, cell proliferation and extracellular matrix synthesis at 1 week, and mechanical properties over 2 weeks were investigated. Cell attachment was comparable and cell proliferation was faster in Group I. Moreover, cellular function was more actively exhibited in Group I, as evident by the higher expression of collagen I, decorin, and biglycan genes. Thus, this novel scaffold, facilitating cell seeding and promoting cell proliferation, function, and differentiation, could be applied with promise in tissue engineering of tendon/ligament.
Collapse
|
187
|
Rout PK, Sahoo S, Rao YR. Essential Oil Composition ofCymbopogon microstachys(Hook.) Soenarke Occurring in Manipur. JOURNAL OF ESSENTIAL OIL RESEARCH 2005. [DOI: 10.1080/10412905.2005.9698929] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
188
|
Rout PK, Sahoo S, Rath SP, Rao YR. Analysis of the Leaf, Rhizome and Root Oils of Two Accessions ofAlpinia calcarataRosc. Cultivated at Bhubaneswar. JOURNAL OF ESSENTIAL OIL RESEARCH 2005. [DOI: 10.1080/10412905.2005.9698941] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
189
|
Rollmann G, Sahoo S, Entel P. Structural and magnetic properties of Fe-Ni clusters. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pssa.200405436] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
190
|
Sahoo S, Verma RK, Suresh AK, Rao KK, Bellare J, Suraishkumar GK. Macro-level and genetic-level responses of Bacillus subtilis to shear stress. Biotechnol Prog 2004; 19:1689-96. [PMID: 14656143 DOI: 10.1021/bp034191w] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Responses of bacterial (Bacillus subtilis) cells under different shear levels, from both the macro and genetic viewpoints, have been presented. The responses were studied using a novel, couette flow bioreactor (CFB), in which the entire cultivation can be performed under defined shear conditions. Oxygen supply, the normal limiting factor for entire cultivations under defined shear conditions, has been achieved by passing air through a poly(tetrafluoroethylene) (PTFE) membrane fixed on the inner cylinder of the CFB. More importantly, analyses of the oxygen transfer capabilities as well as the shear rates show that in this CFB, the effects of defined shear can be studied without interference from the effects of oxygen supply. Further, the shake flask can be used as a proper control for studying the shear effects, mainly because the shear rate in the shake flask under normal shaker operating conditions of 190 rpm has been estimated to be a negligible 0.028 s(-1) compared to a value of 445 s(-1) at the lowest rpm employed in the CFB. At the macro level the cell size decreased by almost 50% at 1482 s(-1) compared to that at 0.028 s(-1), the growth rate increased by 245%, and the maximum cell concentration increased by 190% when the shear rate was increased from 0.028 to 1482 s(-1). The specific intracellular catalase level increased by 335% and protease by 87% at 1482 s(-1) as compared to the control cultures at a shear rate 0.028 s(-1). In addition, the specific intracellular reactive oxygen species level (siROS) at the highest shear rate was 9.3-fold compared to the control conditions. At the genetic level we have established the involvement of the transcription factor, sigma(B), in the bacterial responses to shear stress, which was unknown in the literature thus far; the sigma(B) expression correlated inversely with the siROS. Further, through experiments with ROS quenchers, we showed that ROS regulated sigma(B) expression under shear.
Collapse
|
191
|
Sahoo S, Rao KK, Suresh AK, Suraishkumar GK. Intracellular reactive oxygen species mediate suppression of sporulation inBacillus subtilis under shear stress. Biotechnol Bioeng 2004; 87:81-9. [PMID: 15211491 DOI: 10.1002/bit.20095] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sporulation is an important cellular response to stress that is also significant from a bioreactor operation viewpoint. While sporulating organisms are known to show an enhanced sporulation response under several stress situations, the sporulation response to shear stress has not been investigated thus far. Such a study could be of interest since shear stress, to a greater or lesser degree, is always present in bioreactor operation. In this article, we investigate the sporulation extents of the Gram-positive bacteria Bacillus subtilis at various defined shear levels. We show that, contrary to expectations, shear inhibits sporulation. We found an inverse correlation between the shear rate-dependent specific intracellular reactive oxygen species level (siROS), and the sporulation extent. A 10-fold increase in siROS resulted in about 17-fold decrease in sporulation extent. The involvement of reactive oxygen species (ROS) in sporulation was unknown thus far. Further, through experiments that specifically increased and reduced intracellular ROS (iROS), we established that siROS is responsible for the inhibition of sporulation under shear stress. In addition, we found that shear induced siROS regulated the expression levels of the general stress proteins Ctc and sigma(B). Based on the above, we hypothesize that siROS may regulate suppression of sporulation under high shear by altering sigma(B) and Ctc expression levels, and a model for the same is presented.
Collapse
|
192
|
Abstract
We report two neonates with thrombosis of the aortic arch and isthmus diagnosed by echocardiography. Neonatal transient protein C deficiency was present in one patient and the other patient had severe perinatal asphyxia. Both patients presented with markedly reduced left ventricular function and severe aortic obstruction. In one infant, the thrombus was successfully removed surgically, and the second infant died due to serious complications of perinatal asphyxia.
Collapse
|
193
|
Sahoo S, Rao KK, Suraishkumar GK. Induced reactive oxygen species improve enzyme production from Aspergillus niger cultivation. Biotechnol Lett 2003; 25:821-5. [PMID: 12882014 DOI: 10.1023/a:1023508609623] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Intracellular reactive oxygen species (iROS) induction by HOCl was used as a novel strategy to improve enzyme productivities in Aspergillus niger growing in a bioreactor. With induced iROS, the specific intracellular activities of alpha-amylase, protease, catalase, and glucose oxidase were increased by about 170%, 250%, 320%, and 260%, respectively. The optimum specific iROS level for achieving maximum cell concentration and enzyme production was about 15 mmol g cell-1. The type of iROS inducing the enzyme production was identified to be a derivative of the superoxide radical.
Collapse
|
194
|
Abstract
The base distributions in coding DNA sequences (CDS) are investigated. We explore the scaling properties of the 4-dimensional directed random walk and compare them with that for the DNA sequences. Inference from these observation are, however, contradicted by alternate analysis using factorial moments. To resolve this conflict we look directly at the nucleotide base distributions. In all the cases the base distributions change from gaussian to non-gaussian as the scale size is increased. The CDS, therefore, have nucleotide distributions different from the random.
Collapse
|
195
|
Som A, Sahoo S, Mukhopadhyay I, Chakrabarti J, Chaudhury R. Scaling violations in coding DNA. EUROPHYSICS LETTERS (EPL) 2003; 62:271-277. [DOI: 10.1209/epl/i2003-00341-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
|
196
|
Gupta KC, Sahoo S. Graft copolymerization of acrylonitrile and ethyl methacrylate comonomers on cellulose using ceric ions. Biomacromolecules 2002; 2:239-47. [PMID: 11749179 DOI: 10.1021/bm000102h] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The graft copolymerization of acrylonitrile and ethyl methacrylate from their binary mixtures onto cellulose has been carried out in the presence of Ce(IV) ions in acidic media at 30 +/- 0.1 degrees C. The graft copolymerization has shown an increasing trend on increasing the feed molarity of the comonomers and on increasing the reaction time. The analysis of grafted cellulose prepared with different feed compositions (f(AN)) has clearly indicated the existence of the synergistic effect of ethyl methacrylate on acrylonitrile which normally shows poor affinity for grafting on cellulose while used individually. The elemental analysis and IR data were used to determine the composition of grafted copolymers and reactivity ratios (r(1), r(2)) of the monomers using the Mayo and Lewis method. The reactivity ratios for acrylontrile and ethyl methacrylate have been found to be 0.68 and 1.15, respectively, which supported the alternate arrangement of the monomer blocks of individual monomers in the grafted chains. The rate of grafting has shown a square dependence on the concentration of the comonomers within the studied range of feed molarity from 0.5 to 2.5 mol dm(-3). The grafting data were used to calculate the number of grafted chains (N(g)), frequency of grafting (G(F)) per molecule of the cellulose and efficiency of grafting (G(E)). The variation in these parameters as a function of feed molarity, feed composition, and ceric ion concentration has been determined. The rate of ceric ion disappearance as a function of feed molarity and reaction time has provided strong support to consider the participation of ceric ions in the formation of free radicals at the backbone of the cellulose. On the basis of the experimental observations, reaction steps for grafting of monomers on cellulose have been proposed.
Collapse
|
197
|
Sahoo S, Hoda SA, Rosai J, DeLellis RA. Cytokeratin 19 immunoreactivity in the diagnosis of papillary thyroid carcinoma: a note of caution. Am J Clin Pathol 2001; 116:696-702. [PMID: 11710686 DOI: 10.1309/6d9d-7jcm-x4t5-nnjy] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
To evaluate the expression of cytokeratin (CK) 19, we stained sections obtained from formalin-fixed, paraffin tissue blocks of 35 thyroid tumors (follicular adenoma [FA], 20; papillary thyroid carcinoma [PTC], 10 follicular variant [FV] and 5 usual type) and scored the extent of staining as follows: 1+ (<5% positively stained cells), 2+ (5%-25% positively stained cells), 3+ (25%-75% positively stained cells), and 4+ (>75% positively stained cells). All 15 PTCs (including 10 FV-PTCs) were CK19 positive: 14 were 4+ and 1 (FV-PTC) was 2+. All 20 FAs also were CK19 positive: 15 were 1+, 1 was 2+, 4 were 3+, and none was 4+. In the FAs that were scored 1+, reactivity usually was confined to follicular cells lining cystically dilated atrophic follicles that lacked the typical nuclear features of PTC. The remaining FAs showed more diffuse reactivity, which was, however, less intense than that observed in the PTCs. Thus, immunoreactivity for CK19 is not specific for PTC, although we acknowledge that the extent and intensity of staining are considerably greater in this tumor than in FA. There were no significant differences in staining for CK19 between nonneoplastic follicles adjacent to PTCs and those adjacent to FAs.
Collapse
|
198
|
Das BB, Richardson C, Lala R, Sahoo S. Primary immature mediastinal teratoma in a newborn. Indian Pediatr 2001; 38:1181-4. [PMID: 11677311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
|
199
|
Rawool SB, Sahoo S, Rao KK, Sureshkumar GK. Improvement in enzyme productivities from mold cultivations using the liquid-phase oxygen supply strategy. Biotechnol Prog 2001; 17:832-7. [PMID: 11587571 DOI: 10.1021/bp010078z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cultivations of Aspergillus niger cells in which oxygen was provided through the liquid-phase oxygen supply strategy (which involves the need-based decomposition of H2O2 pulses to yield the necessary oxygen) were studied. Concentrations of H2O2 in the range of 1 to 5 mM were found to be suitable for use in cultivations. The growth rate constant of 0.17 h(-1) obtained in the H2O2-based cultivation, was comparable to that obtained in the cultivation with aeration; however, the maximum cell concentration in the H2O2-based cultivation was 124% of that obtained in cultivation with aeration. Maximum concentrations of catalase, protease and glucose oxidase obtained in the H2O2-based cultivation, were 240%, 172%, and 124% respectively, of those obtained in the cultivation with aeration. Further, the specific enzyme levels (units per gram cell) of catalase and protease obtained in the H2O2-based cultivation were 172% and 156% of those obtained in the cultivation with aeration, whereas, the specific glucose oxidase levels were comparable. In addition, the oxygen profiles inside the pellets ofA. niger during both the modes of oxygen supply were described using mathematical models. Studies to elucidate the mechanism of oxygen availability showed that the decomposition of the H2O2 supplied in the extracellular space occurred intracellularly, as well as extracellularly, to yield oxygen. Also, the proton motive force (PMF) was found to be involved in the process of oxygen availability from H2O2 to A. niger cells.
Collapse
|
200
|
Sahoo S, Smith RE, Potz JL, Rosen PP. Metastatic prostatic adenocarcinoma within a primary solid papillary carcinoma of the male breast. Arch Pathol Lab Med 2001; 125:1101-3. [PMID: 11473469 DOI: 10.5858/2001-125-1101-mpawap] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We report the case of a 78-year-old man who developed a breast mass 12 months after hormonal therapy for palliation of prostatic adenocarcinoma. On histologic and immunohistochemical examination, the breast tumor revealed a unique collision tumor composed of metastatic prostatic adenocarcinoma and solid papillary breast carcinoma.
Collapse
MESH Headings
- Adenocarcinoma/pathology
- Adenocarcinoma/secondary
- Adenocarcinoma/therapy
- Aged
- Alkaline Phosphatase/analysis
- Breast Neoplasms, Male/pathology
- Breast Neoplasms, Male/secondary
- Breast Neoplasms, Male/surgery
- Carcinoma, Papillary/pathology
- Carcinoma, Papillary/surgery
- Humans
- Immunohistochemistry
- Keratins/analysis
- Male
- Mastectomy, Radical
- Neoplasms, Multiple Primary/pathology
- Prostate-Specific Antigen/analysis
- Prostatic Neoplasms/drug therapy
- Prostatic Neoplasms/pathology
- Receptors, Androgen/analysis
- Receptors, Estrogen/analysis
- Receptors, Progesterone/analysis
Collapse
|