Proximally induced accommodation and accommodative adaptation

To determine the effect of proximally induced accommodation (PIA) on accommodative adaptation, this study has examined the posttask shift in tonic accommodation (TA) following 5-min monocular viewing of equivalent-sized targets located at distances of 0.33 and 5 m. The distal target was viewed through a negative lens to equate the dioptric stimuli (3 D). The steady-state accommodative response was measured subjectively in 10 subjects using a Hartinger coincidence optometer. A significant correlation was observed between the degree of adaptation following the two conditions, with the magnitude of adaptation for the distal target being approximately half that for the nearer target. Furthermore, adaptation magnitude was inversely correlated with pretask TA under both conditions. These results indicate that PIA can produce accommodative adaptation. The implications of this finding are discussed with regard to models of the accommodative mechanism.     

Computed tomography in obstetrics and gynecology.

Computed tomography (CT) has become essential in the diagnostic evaluation of the female pelvic. CT allows accurate delineation of neoplastic and inflammatory processes and provides an effective means of guiding percutaneous needle biopsy of masses and aspiration/drainage of fluid collections. In the pregnant woman, pelvimetry and excretory urography can be performed using the CT scout view with a radiation dose significantly lower than with conventional x-ray techniques. This paper covers the clinically relevant technical considerations involved in performing CT on women and follows with an overview of normal female pelvic anatomy and frequently encountered pathologic conditions.     

Single,mediastinal, unilobar lung -a rare form of subtotal pulmonary agenesis

We describe a case of a full-term infant with severe respiratory failure and pulmonary insufficiency caused by an anomaly consisting of a single, unilobar lung arising from the trachea and situated in the middle mediastinum. Plain film, echocardiogram, and surgical aspects will be described and correlated with the post mortem findings and embryologic considerations. We were unable to find a similar case reported in the literature and conclude that this rare lesion represent an intermediate form between total and unilateral pulmonary agenesis. Presented at the Society for Pediatric Radiology, Washington D.C. 12 April 1986     

Expression and functional activity of CXCR-4 and CCR-5 chemokine receptors in human thymocytes

In this paper we addressed the expression of the HIV co-receptors CXCR-4 and CCR-5 in human thymocytes by phenotypic, molecular and functional approaches. Cytofluorimetric analysis disclosed that CXCR-4 was constitutively expressed by freshly isolated thymocytes (~10 000 molecules/cell in about 30% of thymocytes); the receptor was endowed with functional activity, as it mediated polarization, migration and intracellular Ca2+ increase in response to its ligand, SDF-1. On the contrary, CCR-5 expression in freshly isolated thymocytes was significantly lower (<4000 molecules/cell in less than 5% of the cells), and no functional response to CCR-5 agonists could be documented. Northern blot analysis of freshly isolated thymocytes showed high CXCR-4 mRNA levels, whereas the message for CCR-5 was barely detectable. On the other hand, a modest increase in the expression of CCR-5 was associated with in vitro thymocyte stimulation, and CCR-5 density at the cell surface attained CXCR-4 figures in most cases. None the less, no functional response to CCR-5 agonists could be documented in in vitro stimulated thymocytes. In vitro infection of thymocytes by CAT-expressing recombinant HIV bearing the envelope glycoproteins from different isolates showed that T-tropic strains, which use CXCR-4 as a co-receptor, were more efficient in infecting thymocytes than M-tropic strains, which preferentially use CCR-5. Altogether, these data indicate that expression of the major co-receptors involved in infection by M-tropic HIV strains is very poor in human thymocytes, and would suggest that thymocyte infection by M-tropic HIV strains may be a rare event in vivo.     

Evaluation of a one-year Masters of Public Health program for medical students between their third and fourth years.

For physicians to better treat and advise their patients on the roles of behavioral and social factors in health and disease, greater levels of competency in social and behavioral sciences are needed. Physicians should also understand the structure, financing, and administration of the health care delivery system, so that they will be able to practice medicine effectively and participate in planning and managing the delivery of care. And, improving overall public health requires that physicians understand the basic tenets of population-based medicine. One way to achieve these goals is to develop education and training programs for integrating formal public health training with formal medical training.There are many models by which a medical student or practitioner can obtain a master of public health (MPH) degree. In this article, the authors describe an accelerated one-year MPH program for competitively selected New York City medical students who have completed their third year of training and enroll at the Mailman School of Public Health, Columbia University. The Macy Scholars Program, offered between 1999 and 2007 to 12 students per year, is completed between the third and fourth years of medical school. Under full-tuition scholarships, students complete a practicum experience, attend seminars, and write a master-level paper or thesis, among other requirements. Data from an evaluation of this program demonstrate participant satisfaction and support of the program, outstanding academic performance, and the effect of public health training on their residency and career choices.     

Renal aspergillosis: a report of two cases.

Two cases of opportunistic aspergillosis of the kidney are presented. One patient, a child with unsuspected chronic granulomatous disease of childhood, presented with a renal mass which proved to be an abscess secondary to aspergillosis. The other patient, a terminal leukemic, had a renal vein thrombosis secondary to invasion of the renal vein by aspergillosis. Aspergillosis and other fungal diseases of the kidney should be considered in debilitated patients with an abnormal urogram.     

Imaging of the testicle: the painful scrotum and nonpalpable masses.

Scrotal pain is initially evaluated by color Doppler ultrasonography providing information on the presence or absence of flow within the testis and B Scan imaging providing important complementary information about lesions such as torsion of the appendix testis and testicular abscess. While radioisotope scanning provides similar information to color Doppler about testicular flow, it does not demonstrate the anatomy. Testicular imaging is extremely sensitive for "silent masses" and useful to evaluate palpable ones. Characteristic findings may be seen with simple testicular cysts and epidermoid cysts. Homogeneously hyperechoic masses have a variety of etiologies but are virtually always benign. A major limitation of a ultrasonography is the large number of nonneoplastic lesions which may mimic tumors.