OBJECTIVE: Recently, we have demonstrated that embryonic ventral spinal cord motor neurons(ESMNs), transplanted into the distal stump of the axotomized tibial nerve, can grow into the denervated gastrocnemius muscle and form neuromuscular junctions. Our interest in study was to see whether these newly formed neuronal connections are physiologically active, and to electrophysiologically characterize the reinnervated motor units. MATERIAL AND METHODS: Three to eight weeks after transplantation rats were prepared for electrophysiological recording. Motor unit (MU) action potential and gross EMG were monitored. In eleven out of sixteen transplanted animals single unit and gross EMG were recorded after electrical stimulation of the transplant site. Total of 63 motor units were analyzed for their stimulus threshold (ST), latency and stimulus intensity, which is required to produce maximum firing. RESULTS: ST intensities activating MUs were significantly higher in transplanted animals than in controls. Maximum firing of MUs occurred at less than 1.2×T in the control but greater variation was observed in the transplanted animals ranging from 1.1×T to 1.6×T. No significant differences were found in the latencies of MU's firing following stimulation. MU firing was reversibly blocked by infusion of succinylcholine. CONCLUSION: we characterized the temporal, morphological and electrophysiological parameters of denervated skeletal muscle reinnervated by dissociated grafts of embryonic ventral spinal cord cells. MUs reinnervated by the embryonic motoneuronal transplant were physiologically active, with some properties similar to the MUs of the normal.
Action Potentials ; Animals ; Electric Stimulation ; Fires ; Mice ; Motor Neurons ; Muscle, Skeletal ; Neuromuscular Junction ; Neurons ; Rats ; Spinal Cord ; Succinylcholine ; Tibial Nerve ; Transplants

In the summer of 1969 from July through October, authors carried out a study of susceptibility in adult female bed bug(Cimex lectularius) in order to ascertain any development of resistance to insecticides in Korea. The test to DDT and Dieldrin was performed in laboratory by the continuous exposure of residues method, with standard impregnated paper used for adult mosqitoes. Some results so far obtained can be summarised as follows: LC(50) were 2.839% in DDT and 0.167% in Dieldrin. The resistance has been arisen 2.4-2.9 times in DDT and 1.6-2.4 times in Dieldrin as compared with London laboratory strain, but they were susceptible 1.4 times in DDT and 180 times in Dieldrin as compared to Israel resistance strain.
parasitology-arthropodology-bed bug-Cimex lectularius ; prevention ; chemotherapy ; resistance ; DDT ; dieldrin

Three combinations of cloths were evaluated for the protective effects of different kinds of clothings in cold environments. Table 1 shows tile components of tile three models of clothings. A prototype was made by putting a sheet of vinyl at the middle layer of raw cotton in a fabric-quilt cloths. A glove mannequin was covered by each of these cloths. The globes contained 1,000 cc of hot water about 40 degrees C. Tele-thermisters were fixed in order to check the temperature of cloths space and water temperature for evaluation of caloric-loss and climate of clothings. Results are summarized as follows : 1) Without wind, there is no significant difference of air temperatures between ski-parka and quilt wear clothing. 2) The prototype with vinyl sheet best protects against wind, the next is the ski-parka. Quilt-wear protects the least. 3) It is well-known that a working-clothing needs not have any separate liners nor outers. 4) For innermost layer of a clothing preventing cold, a cotton-fabrics is recommended and a water-proof cloths for outer layer. 5) Heat-loss was calculated from the cooling degrees of water. Calorie-loss was 910ca1/m2/hr. when bared, but with the prototype of vinyl sheets the calorie-loss was 350cal/m2/hr. (38.5% of bared). Quilt-wear and ski-parka were 380(41.8%) and 440 cal/m2/hr. (48.4%) respectively.
Climate ; Clothing* ; Manikins ; Water ; Wind*

The authors evaluated the clinical significance of the bilirubin values as screening test means for predicting the occurrence of neonatal jaundice earlier after birth, by using the transcutaneous bilirubinometry which is known to measure the bilirubin values in a noninvasive, accurate and simple way. The results obtained were as follows: 1. In comparison between the test group(showing the symptom of a jaundice within 72 hours after birth) and the control group, there were found no statistically significant differences in terms of sex, delivery type, birth weight, gestational age and mother's age, while being found statistically significant differences in terms of transcutaneous bilirubin at birth(TcBbirth), transcutaneous bilirubin at 24 hours after birth(TcB24hr), increase in transcutaneous bilirubin per hour during the first 24 hours after birth(TcBin/hr) and transcutaneous bilirubin at 72 hours after birth(TcB72hr)(p<0,05). 2. The correlation test using the Pearson's coefficient produced statistically significant correlationship between each transcutaneous bilirubin index (TcBbirth, TcB24hr, TcBin/hr and TcB72hr) and serum bilirubin concentration at 72 hours after birth(B72hr)(p<0.05), while the result of the correlation test using the Spearman's roh showed statistically significant correlationship only between TcB24hr or TcB72hr and B72hr(p<0.05). As it was, the correlationship between TcB72hr and B72hr was highest in both Pearsons coefficient and Spearman's roh tests, followed by that between TcB24hr and B72hr. 3. In view of the ROC graph, the most effective means of predicting the occurrence of the neonatal jaundice was TcB72hr followed by TcB24hr, TcBbirth and TcBin/hr in their order. In particular, TcB24hr was conceived to be useful as screening test for determining an early discharge from the nursery within 48 hours. On the other hand, since the negative predictive value of TcBbirth, and TcB24hr is higher, the possibility that those infants showing a lower value of these indices may well be free later from a serious neonatal jaundice even if they should be discharged earlier from the nursery. In conclusion, those four indices predicting the neonatal jaundice in a simple, quick and noninvasive manner using the transcutaneous bilirubinometry were considered to be effective screening test means whereby any serious neonatal jaundice developed earlier after delivery can be successfully predicted.
Bilirubin ; Birth Weight ; Gestational Age ; Hand ; Humans ; Infant ; Infant, Newborn ; Jaundice ; Jaundice, Neonatal* ; Mass Screening* ; Nurseries ; Parturition

No abstract available.
Child* ; Humans ; Pneumonia, Staphylococcal* ; Thorax*

Sacral perineural cyst is one group of extradural meningeal cyst at the sacral region. These lesions are distinguished from other spinal cysts because perineural cyst does not communicate with subarachnoidal space. Fluid filled cysts may compress adjacent nerve roots causing low back pain and sciatica which are dramatically improved by surgical excision. Differential diagnosis from other cysts can be accomplished by failure of collection of dye into cyst by initial myelography. C-T myelography rules out other mass lesions and often reveals communication of perineural cyst that filled with contrast medium. Magnetic resonance imaging well demonstrates three dimensinnal configures of an intraspinal cystic mass in initial study. However it is important to recognize that these cysts are one of causes of radiculopathy. We report three cases of sacral perineural cysts with radiculopathy.
Diagnosis, Differential ; Low Back Pain ; Magnetic Resonance Imaging ; Myelography ; Radiculopathy ; Sacrococcygeal Region ; Sciatica ; Tarlov Cysts*

The operative treatment of intraarticular calcaneal fractures has three principal aims; restoration of the height and width of the calcaneus, reconstruction of the subtalar and calcaneocuboid joint surfaces, and stable osteosynthesis. The purpose of this study is to demonstrate the effectiveness of the open reduction and internal fixation by the extended lateral approach for the treatment of the intraarticular calcaneal fractures. Twenty-one calcaneal fractures of 20 patients were treated by open reduction and internal fixation using an extended lateral approach from April, 1993 to March, 1994. The autogenous iliac bone graft was done in all patients. These patients were evaluated from 12 to 24 months (average 15.2 months) after surgery. The following results were obtained; 1. Seventecn cases (80%) out of 21 were estimated as good or excellent result. 2. Preoperative Bohler's angles, Gissane's angles and inclination angles were observed as average -0.5degrees, 101degrees and 38degrees respectively, and these were improved as average 23.3degrees, 117degrees and 54degrees, postoperatively. 3. There were two cases of skin necrosis as complication. In conclusion, the extended lateral approach is one of the good methods for the treatment of intraarticular calcaneal fractures. We think that accurate reduction of the posterior facet, acceptable recovery of Bohler's angle and early postoperative mobilization are the most important things for the best result of the intraarticular calcaneal fracture surgery.
Calcaneus ; Humans ; Intra-Articular Fractures ; Joints ; Necrosis ; Skin ; Transplants

Langerhans cell histiocytosis (LCH), previously called histiocytosis X, refers to a spectrum of disease characterized by idiopathic proliferation of histiocytes producing focal or systemic manifestations. Causes and pathogenesis remain unclear. The basic histopatholgic findings are identical in the three well-established clinical syndromes (eosinophilic granuloma, Hand-Shuller-Christian disease, Letterer-Siwe disease). The disease has a predilection for children, although it may occur in adults. We experienced two cases of adult onset Langerhans cell histiocytosis in the ribs. One case was associated with diabetes insipidus and the other case had a solitary lesion.
Adult* ; Child ; Diabetes Insipidus ; Granuloma ; Histiocytes ; Histiocytosis ; Histiocytosis, Langerhans-Cell* ; Humans ; Ribs*

Metaplastic carcinoma is a rare form of breast carcinoma in which a variety of metaplastic changes occur. These commonly involve squamous or spindle cells, but pure chondroid metaplasia is relatively uncommon. We report a case of metaplastic carcinoma of the breast which mainly involved chondroid metaplasia and in which chondroid calcifications were seen on mammograms.
Breast Neoplasms ; Breast* ; Cartilage ; Metaplasia

We experienced a patient of 13 days old female who was diagnosed with Ritter's disease and reported with brief review of literatures. 3 days before entry, she was suffered from fever, irritability and bullous skin lesions suddenly. And then coagulase-positive staphylococcus aureus was isolated from skin lesions and treated with systemic and local supportive measures.
Female ; Fever ; Humans ; Skin ; Staphylococcal Scalded Skin Syndrome* ; Staphylococcus aureus