计算机辅助设计大大简化了功率因素变换器的设计

由于能源调节的持续增长，电源变得越来越复杂。人们意识到需要一个更简单的方式进行设计时，出现了计算机辅助设计工具。这篇文章就论述了此工具如何很快产生一个连续导通模式升压功率因素校正设计的优势。全部设计已经得到证实，并且会提供一些相关的公式。     

The role of apitherapy in the combined treatment of patients with chronic nonspecific lung diseases]

The authors suggest that apitherapy should be used in the treatment of patients with chronic non-specific pulmonary diseases (ChNPD) in order that it might be more effective. Apitherapeutic complex (bee venom and bee keeping apiculture produce) has been applied to the treatment of 104 ChNPD patients. High effectiveness of apitherapy in a combined treatment of ChNPD patients was demonstrated as was their stimulating and normalizing influence on the function of the adrenals.     

The etiological and pathogenetic characteristics of duodenal peptic ulcer in adolescents

Studied by endoscopy were 100 adolescents with diagnosed duodenal ulcer, as were 100 essentially healthy subjects and 90 ones of the same age presenting with primary chronic gastroduodenitis together with 60 adults who had duodenal ulcer. The following items were etiologic risk factors for duodenal ulcer, if combined, in the above adolescent series: Frequent episodes nervous of tension, hereditary predisposition and helicobacteriosis. In juveniles with duodenal ulcer, secretion and motility of the stomach appeared to be subjected to changes to a higher degree than it was in adult subjects with duodenal ulcer, while functions of the psychovegetative and immune systems were found to be less changeable in the former. In adolescents presenting with duodenal ulcer and primary chronic gastroduodenitis, the etiologic risk factors and pathogenetic changes were found out to be identical.     

A four-year experience with laparoscopy in the management of appendicitis

BACKGROUND: The study was conducted to determine the influences of laparoscopy in the management and outcome of patients with appendicitis. METHODS: A retrospective analysis of 154 consecutive patients who were treated for suspected appendicitis. The pre-operative diagnosis included appendicitis, right lower quadrant pain of unknown etiology, and generalized peritonitis. RESULTS: Laparoscopy was used in 108 patients, including 70 laparoscopic appendectomies (LA) and 31 LAs converted to open appendectomy (OA). Forty-six patients had OA. The average operating time for LA was 74.3 minutes and 48.8 minutes with OA. Postoperative complications for LA (7%) included 1 trochar wound hemorrhage, 2 wound infections, and 2 intra-abdominal sepsis; and for OA (9%) were 1 post-operative intra-abdominal hemorrhage, 4 wound infections, 1 wound dehiscence, and 1 intra-abdominal sepsis. Post-operative stay for LA averaged 2.5 days and for OA averaged 4.5 days (P = .0049). LA patients had a considerably faster return to work and/or normal activity than OA patients (P = .00065). CONCLUSIONS: Laparoscopy influenced the management of 29% of patients presenting with suspected appendicitis. LA resulted in shorter hospitalization and a more rapid return to work and/or normal activity than OA.     

Evaluation of the adequacy of oxygen consumption by tissues using the "anionic burst" parameter

A cDNA encoding farnesyl diphosphate (FPP) synthase (FPPS) has been cloned from a cDNA library of Artemisia annua. The sequence analysis showed that the cDNA encoded a protein of 343 amino acid (aa) residues with a calculated molecular weight of 39420 kDa. The deduced aa sequence of the cDNA was highly similar to FPPS from other plants, yeast and mammals, and contained the two conserved domains found in polyprenyl synthases including FPPS, geranylgeranyl diphosphate synthases and hexaprenyl diphosphate synthases. The expression of the cDNA in Escherichia coli showed enzyme activity for FPPS in vitro.     

Should the presence of coiled blood flow in the left heart ventricle and aorta be taken into consideration when constructing artificial heart valves?]

This study presented the outcome of 92 EOC patients treated by platinum or platinum analogue with cyclophosphamide from January 1, 1993 to December 31, 1995. There were 77 evaluable patients. The follow-up ranged from 4-42 months (median 14 months). The over all 3-year survival was 64 per cent and the median progression-free interval was 16 months for the whole group. There was no significant difference in survival between patients who received cisplatin and those who received carboplatin (P = 0.093). Patients who underwent optimal debulking surgery had significantly longer progression-free interval (P = 0.001) than those who had sub-optimal surgery. Fifty four per cent of patients with clear cell carcinoma died of the disease. Patients who received cisplatin had a drop out rate while on therapy more often (24% vs 5.3%) than that of carboplatin. Toxicities from chemotherapy were moderate but manageable.     

Correlation of the production of gonadotropic and sex hormones in boys and girls during sex maturation

There is an early period of puberty in boys at the age of 10 to 13, accompanied by an increase in the level of follicle stimulating hormone and a low secretion of luteinizing hormone and testosterone, with no secondary sexual signs. The beginning of an increase in the luteinizing hormone and testosterone concentration in boys coincides with the development of secondary sexual signs. The stabilization of the level of luteinizing hormone takes place in boys already at the 2nd degree of the sexual development. The secretion of luteinizing hormone at this point corresponds already to the normal level in adult men. The level of testosterone in the blood continues to increase and does not reach its definitive level until after the age of 17, or at the 5th degree of sexual development. Like in boys, the increase of the follicle stimulating hormone in girls precedes the increase of the luteinizing hormone secretion. The beginning of the increase in the follicle stimulating hormone coincides with an increase in the level of estrogens and testosterone in the blood, and with the appearance of secondary signs of sexual maturation. The increase of the luteinizing hormone secretion takes place later in girls than in boys and is accompanied by a new and significant increase in the level of estrogens in the blood. At the 2nd degree of sexual development, the level of testosterone in the blood of girls is substantially higher than at the other stages.