Metachronic Breast and Cerebellar Neoplasm in a Young Patient.

Several factors trigger the development of genetic mutations that are responsible for causing a neoplasm. Medulloblastoma is a malignant and invasive cerebellar neoplasm, that affects children and young adults. Mucinous carcinoma is a special type of breast cancer.

Differential effects of weather and natural enemies on coexisting aphid populations.

Study of mechanisms responsible for regulating populations of living organisms is essential for a better comprehension of the structure of biological communities and evolutionary forces in nature. Aphids (Hemiptera: Sternorrhyncha) comprise a large and economically important group of phytophagous insects distributed worldwide. Previous studies determined that density-dependent mechanisms play an important role in regulating their populations.

Applying systems engineering to implement an evidence-based intervention at a community health center.

Impressive results in patient care and cost reduction have increased the demand for systems-engineering methodologies in large health care systems. This Report from the Field describes the feasibility of applying systems-engineering techniques at a community health center currently lacking the dedicated expertise and resources to perform these activities.

Relation between index finger width and hand width anthropometric measures.

Measures of hand and finger anthropometry are very important for designing many hand held devices as well as understanding anthropometric effects on the operation of such devices. Many historical datasets have measured and recorded gross hand dimensions but do not often record the finer dimensions of the hand such as finger anthropometry. Knowing the size and mass of fingers across genders can be critical to the design and operation of hand held devices.

Relation between mouse button click duration and muscle contraction time.

Contraction and half relaxation times are important temporal measures of the physiological state of the muscle. We hypothesize that mouse button click durations may mirror muscle twitch contraction times (contraction time + half relaxation time). When comparing muscle twitch contraction times and mouse button-click durations between children, adult females and adult males only small differences in muscle twitch contraction times were observed across these groups whereas large differences in mouse button click durations were measured.

The effect of background spatial contrast on electroretinographic responses in the human retina.

The electroretinogram (ERG) was obtained to contrast modulation (CM). This stimulus is a product of temporal modulation of the contrast of a spatial sinusoid at constant mean luminance. Mean contrast (10-40%), and modulation depth (25-1.

Early detection of hepatic encephalopathy by recording visual evoked potential (VEP).

The visual evoked potential (VEP) record in response to a pattern stimulus is a non invasive and reliable method of detecting central and peripheral nerve system abnormalities. VEP recording have been used in animals with fulminant hepatic failure, and also in-patients with hepatic encephalopathy and acute severe hepatitis. Our aims were: a.

Astigmatism after penetrating keratoplasty using the Krumeich guided trephine system.

Background: The use of a suction trephine during penetrating keratoplasty has the potential to reduce trephination errors and astigmatism after suture removal.

Methods: In this study, we evaluated refractive astigmatism after suture removal in 26 eyes that had penetrating keratoplasty for keratoconus using refraction, keratometry, and videokeratography. Group I (11 eyes) had manual trephination with an open disposable blade of both the donor (8.

Differences in pattern visual evoked potential (PVEP) between hemodialysis and peritoneal dialysis patients.

The visual evoked potential was recorded in peritoneal and hemodialysis patients as compared to normal controls. By using the appropriate visual stimulus we were able to disclose specific VEP abnormalities for each of the two dialysis groups. The dissociation found between the latency of N70 and P100 in peritoneal dialysis patients suggests a possible postsynaptic visual abnormality not described previously.

Evidence for two distinct nonlinear components in the human pattern ERG.

We obtained the electroretinogram (PERG) in three observers to a 4.6 c/deg grating pattern with a sinusoidal luminance profile which was modulated in time simultaneously with two sinusoidal temporal frequencies (f1 and f2), or at a single frequency (either f1 or f2). Input temporal frequency ranged from 2.

[Concentration of p-aminohippuric acid in the serum and kidney tissue during stimulation of renal excretion of foreign materials].

The renal excretion of p-aminohippuric acid (PAH) can be stimulated in adult rats by repeated applications of probenecid, cyclopenthiazide, and phenobarbital. The present studies have shown that this pretreatment significantly shortens the half-life for PAH too. In pretreated animals the PAH concentration decreases in the renal tissue more rapidly than in the control animals.

[Extent and duration of drug-induced stimulation of renal excretion of p-aminohippuric acid].

Repeated pretreatment with p-aminohippuric acid (PAH), probenecide, cyclopenthiazide, and phenobarbital stimulates the renal excretion of PAH. For an interval of at least 6 hrs following i.p.

[Stimulation of renal excretion of p-aminohippuric acid by repeated administration of drugs in young and adult rats].

The velocity of renal excretion of p-aminohippuric acid (PAH) could be raised by repeated administration of phenol red, probenecid and penicillin, which are actively transported by the acid carrier into the urine like PAH. These drugs produced an effect in fairly lower doses than PAH. The renal excretion of PAH can be accelerated by repeated pretreatment with the lipid-soluble drugs sulfaclomide, sulfamethoxypyridazine and cyclopenthiazide.

[Stimulation of the renal excretion of p-aminohippuric acid by repeated application of phenobarbital].

The rate of renal excretion of p-aminohippuric acid can be accelerated by repeated administration of phenobarbital in adult rats. This stimulation could not be observed in newborn and young rats.