Look inside a resistor to see how it works. Increase the battery voltage to make more electrons flow though the resistor. Increase the resistance to block the flow of electrons. Watch the current and resistor temperature change.

U.S. Army Motor Transport Corps recruiting poster showing a man working in a machine shop, also lists several occupations with their current salaries.

Recruiting poster showing ten "photographs of classes receiving instruction" at the Raritan Arsenal, Metuchen, N.J. Ordnance recruiting poster no. 6. AGO. R.S. no. 215, 12-20-19.

U.S. Army recruiting poster showing a group of men carrying the tools of the engineering trades, also shown is a list of educational opportunities available to new recruits.

Poster showing a disabled man with a crutch standing in a doorway looking at landscape beyond, with Red Cross nurse and others in foreground. Exhibited: American Treasures of the Library of Congress, 2005.

U.S. Navy recruitment poster showing a sailor pointing to a billboard while encouraging a young man to "join the navy and see the world"; also includes list of occupations available in the navy, reasons for joining the navy, and recruiting stations in Pennsylvania and Delaware. Poster caption continues: Visit Japan - India - France - Asia - England - South America - Europe ; Important - read this: Become a self-reliant, capable man- ; Become an independent man- ; Become a master tradesman or mechanic- ; Don't wait, for this is your real chance ....

U.S. Army recruiting poster showing a map of the United States entitled "The work of the Construction Division of the Army" which identifies locations as "National Guard Camps", "Signal Corps Camps", "Tank Corps", "Nitrate Plant", "Chemical Warfare Camps", "Artillery Camps", "Ordnance Arsenals", and others; also lists a number of employments available to enlisted servicemen. Poster caption: Learn a trade while serving a one or three year enlistment with the Army builders ; Pay from $30 to $105 per month - Age limits 18 years to 45 years ; Food, clothing, quarters and medical attendance free. Where else can you find such an opportunity?

U.S. Army Motor Transport Corps recruiting poster showing two men working in an auto repair shop, also shows truck from the Army Motor Transport Corps. Poster caption continues: Become an expert mechanic ; Learn the auto trade.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

A 36-year-old man presented with a large nasal tumor following a long history of multiple meningiomas. At the age of 13, the patient underwent surgical resection and received a single course of radiation therapy for a left optic meningioma. He did well until age 33, when he was found to have multiple meningiomas in three new locations: falcine (Figure 1a), right petroclival and right anterior foramen magnum. These were surgically resected but no additional radiation was administered. Three years later, the patient presented with nasal symptoms, headaches, and seizures. Imaging studies revealed a large mass with intracranial and nasopharyngeal component measuring 4.1 x 5.4 x 6.8 cm in greatest dimensions and causing right frontal lobe compression (Figures 1b and 1c). A systemic workup, including PET CT, for other malignancies was unremarkable. A two-stage surgical resection was performed. The mass was initially biopsied by transsphenoidal endoscopic approach and then partially resected by bifrontal craniotomy, frontal sinus obliteration, en bloc ethmoidectomy, and nasal cavity resection.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

This is a patient with chronic normocytic normochromic anemia in the range of 8 to 10 g/dl. Further testing included Iron, TIBC, folate and B12 which were within normal range. Reticulocyte count was increased. Peripheral blood smear showed many target cells, nRBC and polychromasia.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

A 47 year old woman from Honduras presented with severe headache and left eye pain. An initial evaluation by a local ophthalmologist revealed no significant findings. Diagnostic imaging at the time demonstrated a sellar mass lesion. She was commenced on cabergoline, but this was ceased due to nausea, vomiting, and tumor progression. Her headaches persisted and she subsequently developed left eye exophthalmos, ptosis, and ophthalmoplegia. Follow-up CT demonstrated significant growth of the mass and involvement of the left orbital apex and cavernous sinus. She was started on corticosteroids and it was recommended she seek care of this lesion at our center.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

These 5-month-old female twins were referred to a Genetic Counselor shortly after birth for developmental delay and dysmorphic features.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

Nine year-old-boy presenting with left testicular swelling noticed 2-3 months prior to physician visit.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

A 10 months old boy was admitted because of spasticity of both legs and a history of developmental arrest. He had problems with coordination of movements and particularly difficulty in holding position of his head. The head circumference was enlarged.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

The patient is a 10 month-old girl who was born after a full term pregnancy via cesarean section secondary to failure to progress. The pregnancy was notable for polyhydramnios, well-controlled gestational diabetes, and decreased fetal movements late in the third trimester. At birth the baby was found to have a cardiac murmur and was mildly hypotonic, with difficulty feeding. An echocardiogram at 3 months showed mild asymmetric septal hypertrophy with possible biventricular hypertrophy, which at the time was attributed to gestational diabetes. Laboratory tests at 6 months showed elevated liver enzymes. The patient's development over time was notable for delayed achievements of new motor milestones, as well as the loss of achieved milestones.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

The patient is a 10 year old female, active in dance classes. She is referred to rheumatology at UPMC following a week-long bout of malaise accompanied in the last several days by a pruritic lacy rash on her trunks and limbs (Figure 1). An anti-nuclear antibody (ANA) assay obtained by the outside physician at an outside laboratory was positive to a titer of 1:1,280.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

The patient is a 10 year old female, who underwent liver transplantation at the age of 2 for Alagille syndrome-related end-stage liver disease. Prior to transplantation, she received 36 mg of thymoglobulin followed by 24 mg post transplant, and tacrolimus 2 mg twice daily. Her immediate post transplant course was complicated by a pulmonary thromboembolism and acute cellular rejection which were treated with corticosteroids and antibiotics. Approximately one year after transplant, the patient presented with flu-like symptoms that included fever, rhinorrhea, body aches and an EBV titer of 30 million copies/ml. She was admitted for ganciclovir and CytoGam administration with EBV surveillance. An abdominal CT scan demonstrated a liver lesion along with cervical and axillary adenopathy. A liver biopsy demonstrated a hepatic Epstein-Barr virus-associated smooth muscle tumor. A lymph node biopsy revealed a CD20 positive infectious mononucleosis-like post transplant lymphoproliferative disorder (PTLD). Immunosuppression was suspended, and she was treated with ganciclovir, CMV-IGIV and rituximab. Despite the reduction in immunosuppression, her liver lesions increased in size. Chemotherapy was felt to be of no additional benefit in treating the CD20 negative liver lesion. The liver lesions were monitored with scans She received 4 doses of rituximab with decrease in size of her lymph node PTLD. At the age of 8 she was no longer receiving immunosuppression and her liver masses remained stable in size by CT scan evaluation. At 10 years of age, she presented to the hospital with abdominal pain. A CBC demonstrated the following:

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

Lab results from an outside hospital showed +3 blood in the urine. BUN and Cr were within the normal limit. Hematology work up revealed normocytic anemia and lymphopenia, and thyroid function tests showed only slightly elevated TSH at 5.9 U/ml.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

A 12-year-old male presented with a 14-month history of progressive weakness of his right arm and leg as well as a deviated mouth. Physical examination revealed a mild right-sided central facial palsy and mild right hemiplegia. MRI axial T1 images showed a mixed and ill-defined signal in left thalamus and cerebral peduncle with mild speckled enhancement (Figure 1a). The anterior horn of the left lateral ventricle and left lateral fissure were enlarged as compared with contralateral side (Figures 1a, 1b). The left cerebral peduncle was significantly smaller than that on the right (Figures 1c, 1d). A stereotactic needle biopsy was performed.

(This case study was added to OER Commons as one of a batch of over 700. It has relevant information which may include medical imagery, lab results, and history where relevant. A link to the final diagnosis can be found at the end of the case study for review. The first paragraph of the case study -- typically, but not always the clinical presentation -- is provided below.)

12 year-old boy without significant past medical history presented with substernal chest pain. He was diagnosed to have left lower lobe pneumonia and was receiving oral antibiotics for 2 days prior to this referral. His chest pain subsided after albuterol nebulizer treatment in a local hospital, but he was found to have elevations of cardiac troponin I (cTnI) and creatine kinase (CK)-MB with ST changes on electrocardiogram (ECG), and was referred for further evaluation.