Tulane University

About: Tulane University is a education organization based out in New Orleans, Louisiana, United States. It is known for research contribution in the topics: Population & Blood pressure. The organization has 24478 authors who have published 47205 publications receiving 1944993 citations. The organization is also known as: University of Louisiana.

The spline-Laplacian in clinical neurophysiology: a method to improve EEG spatial resolution.

Abstract: SummaryAn important goal of EEG research is to obtain practical methods to improve the spatial resolution of scalp-recorded potentials, i.e., to make surface data more accurately represent local underlying brain sources. This goal may be somewhat different from that of “localizing brain activity wit

Pyogenic abscess of the liver

Abstract: 1. 1. An analysis is presented of 830 cases of pyogenic hepatic abscess collected from the world literature and a presentation of 47 additional cases is made. 2. 2. During the ten-year period, 1928–1937 inclusive, there were 186 cases of abscess of the liver admitted to Charity Hospital and Touro Infirmary in New Orleans. Of this number, 139 (74.7 per cent) were amebic abscesses and 47 (25.2 per cent) were pyogenic. During this same period there were 540,776 total admissions to the Charity Hospital, among which there were 160 (0.029 per cent) abscesses of the liver, and 1,152 patients diagnosed as having liver disease, of which 10.2 per cent were amebic abscesses and 3.6 per cent were pyogenic abscesses. The sex incidence of pyogenic hepatic abscess reveals a preponderance of occurrence in the male, 67.4 per cent in the collected series and 70.2 per cent in the authors'. This is probably explained by the fact that the etiologic agents occur more frequently in the male. The greatest age incidence is from the third to the fifth decades. There is no significant racial predisposition. 3. 3. Pyogenic liver abscess is primarily a complication of an intra-abdominal suppurative process with the antecedent lesions in the portal area. Of these lesions, suppurative appendicitis is the most frequent. Appendicitis was the etiologic agent in 34.2 per cent of the collected cases and 10.6 per cent of the authors' cases. This discrepancy is due to the fact that the majority of reports in the literature represented primarily the author's interest in pylephlebitis and liver abscess as complications of appendicitis. Pyogenic liver abscess can be caused also by direct extension from contiguous suppurative processes, trauma, and by transportation of microorganisms through the hepatic artery from distant foci. There is a relatively large group (59.5 per cent) of the authors' series termed “cryptogenic,” idiopathic, or primary pyogenic hepatic abscess in which the antecedent lesion could not be determined. 4. 4. The most frequently found organisms in pyogenic hepatic abscess are B. coli, streptococci, and staphylococci. 5. 5. Pyogenic hepatic abscess may be multiple or single, and usually involves the right lobe. The abscesses were single in 28.8 per cent, multiple in 71.1 per cent, and involved the right lobe alone in 41.8 per cent of the collected cases. In the authors' forty-seven cases these incidences were 54.5 per cent, 45.4 per cent, and 68.1 per cent, respectively. 6. 6. The principal symptoms and signs of pyogenic hepatic abscess are fever, pain and tenderness over the hepatic area, liver enlargement, chills, and jaundice. Characteristically, there is a leucocytosis with a proportionate increase in polymorphonuclear leucocytes. The characteristic roentgenologic changes are elevation and immobility of the diaphragm, usually the right. The diagnosis was positive in 82.1 per cent of 28 cases in the authors' series in which roentgenologic studies were made. 7. 7. The prognosis in pyogenic hepatic abscess depends upon: (1) the multiplicity of the lesions; (2) the presence or absence of complications; and (3) the type of drainage instituted. Whereas of the twenty-four cases in the authors' series with single abscess of the liver nine (37.5 per cent) died, of the twenty cases with multiple abscesses, nineteen (95 per cent) died. The mortality rate was 90.9 per cent in those cases with complications and 36 per cent in the cases without complications. The total mortality rate was 79.6 per cent in the collected cases and 72.3 per cent in the authors' series. Whereas in those cases not operated upon the mortality rate was 100 per cent in both series, in the cases in which operation was performed the mortality was 50.9 per cent in the collected series and 64.8 per cent in the authors' series. 8. 8. The complications of pyogenic hepatic abscess are usually the result of rupture or direct extension into one of the adjacent viscera. 9. 9. The treatment of pyogenic hepatic abscess may be divided into: (1) prophylactic and (2) surgical. Prophylaxis is particularly applicable to multiple hepatic abscesses which are preceded by appendicitis and pylephlebitis, because once the development has proceeded to the stage of multiple abscess formation, surgical therapy offers only the slightest hope. The treatment of solitary pyogenic hepatic abscess consists of incision and drainage. 10. 10. The employment of that type of drainage which completely avoids the slightest possibility of contamination of the peritoneal or pleural cavity is of paramount importance. The results obtained in the authors' series of cases clearly demonstrate this fact. Of the twenty-two cases in which the transperitoneal approach was employed for the institution of drainage, there were sixteen deaths (72.7 per cent). The transpleural method of drainage was used in nine cases with six deaths (66.6 per cent). In contrast to these high mortality rates is the 33.3 per cent mortality obtained in six cases in which the extraserous approach was used.

Protection of macaques from vaginal SHIV challenge by vaginally delivered inhibitors of virus-cell fusion.

Abstract: A trial of three inhibitors of HIV-1 entry into target cells, administered vaginally in macaque monkeys prior to intercourse, shows that they can protect against infection by a simian-human immunodeficiency virus. One molecule, the antiviral CMPD 167, is particularly potent, providing protection when applied 6 hours before challenge. The macaque model is a proven test of AIDS prevention strategies, so these findings bode well for the prospects of similar compounds in humans. Human immunodeficiency virus type 1 (HIV-1) continues to spread, principally by heterosexual sex, but no vaccine is available1. Hence, alternative prevention methods are needed to supplement educational and behavioural-modification programmes. One such approach is a vaginal microbicide: the application of inhibitory compounds before intercourse2. Here, we have evaluated the microbicide concept using the rhesus macaque ‘high dose’ vaginal transmission model with a CCR5-receptor-using simian–human immunodeficiency virus (SHIV-162P3) and three compounds that inhibit different stages of the virus–cell attachment and entry process. These compounds are BMS-378806, a small molecule that binds the viral gp120 glycoprotein and prevents its attachment to the CD4 and CCR5 receptors3,4, CMPD167, a small molecule that binds to CCR5 to inhibit gp120 association5, and C52L, a bacterially expressed peptide inhibitor of gp41-mediated fusion6. In vitro, all three compounds inhibit infection of T cells and cervical tissue explants, and C52L acts synergistically with CMPD167 or BMS-378806 to inhibit infection of cell lines. In vivo, significant protection was achieved using each compound alone and in combinations. CMPD167 and BMS-378806 were protective even when applied 6 h before challenge.

Beyond negative affectivity: Measuring stress and satisfaction in the workplace.

Abstract: Stress researchers frequently use self-report measures to assess stress, health, psychological adjustment, and subjective dissatisfaction. We present evidence demonstrating that all of these variables are highly intercorrelated and reflect a common underlying factor of Negative Affectivity (NA). NA is a stable and pervasive personality dimension-high NA individuals report more stress, distress and physical complaints, even in the absence of any objective stressor or health problem. Thus, NA may operate as a substantial nuisance factor in many areas of research. To circumvent its influence, investigators can use non-subjective measures of stress and health. Finally, we present a two-factor model of stress and satisfaction that includes, in addition to NA, the independent factor of Positive Affectivity (PA), a trait reflecting positive feelings about oneself and one's life.

Antigenic conservation and immunogenicity of the HIV coreceptor binding site

Abstract: Immunogenic, broadly reactive epitopes of the HIV-1 envelope glycoprotein could serve as important targets of the adaptive humoral immune response in natural infection and, potentially, as components of an acquired immune deficiency syndrome vaccine. However, variability in exposed epitopes and a combination of highly effective envelope-cloaking strategies have made the identification of such epitopes problematic. Here, we show that the chemokine coreceptor binding site of HIV-1 from clade A, B, C, D, F, G, and H and circulating recombinant form (CRF)01, CRF02, and CRF11, elicits high titers of CD4-induced (CD4i) antibody during natural human infection and that these antibodies bind and neutralize viruses as divergent as HIV-2 in the presence of soluble CD4 (sCD4). 178 out of 189 (94%) HIV-1–infected patients had CD4i antibodies that neutralized sCD4-pretreated HIV-2 in titers (50% inhibitory concentration) as high as 1:143,000. CD4i monoclonal antibodies elicited by HIV-1 infection also neutralized HIV-2 pretreated with sCD4, and polyclonal antibodies from HIV-1–infected humans competed specifically with such monoclonal antibodies for binding. In vivo , variants of HIV-1 with spontaneously exposed coreceptor binding surfaces were detected in human plasma; these viruses were neutralized directly by CD4i antibodies. Despite remarkable evolutionary diversity among primate lentiviruses, functional constraints on receptor binding create opportunities for broad humoral immune recognition, which in turn serves to constrain the viral quasispecies.