Gyrotron experiments employing a field emission array cathode

The design and operation of a field emission array (FEA) cathode and the subsequent demonstration of the first FEA gyrotron are presented. Up to 10 mA from 30 000 tips was achieved reproducibly from each of ten chips in a gyrotron environment, namely, a vacuum 1 x 10(-8) mbar, -50 kV potential with multiple chip operation, The design parameters of the FEA gun were similar to those of a magnetron injection gun with an achievable electron beam current of 50-100 mA and measured power 720 W cw. Coherent microwave radiation was detected in both TE(02) at 30.1 GHz and TE(03) at 43.6 GHz, with a starting current of 1 mA

BOT expands UMaine anti-hazing rules

One black female student sits among 200 white students in an Introduction to Anthropology class and the professor is speaking on physical characteristics of races. He singles her out of the class and asks if she has trouble sleeping because of her braided, Bo Derek-style hairdo. She says no, and he replies, You must have a really soft pillow, but then, they don\u27t have pillows in Africa

Studies on the gene cluster for oxytetracycline biosynthesis from Streptomyces rimosus

Prior to the work described in this thesis, a great deal of the oxytetracycline cluster (otc) had been sequenced and the putative functions of deduced gene products assigned, based on similarity to known gene products in the databases. The 3.0 kb KpnI23-MluI26b fragment located between the otcD and otcX loci was sequenced. Three open reading frames with the same direction of transcription were found, otcD-ORF3, -ORF4 and -ORF5. OtcD-ORF3 has good similarity to oxidoreductases reported previously in other polyketide gene clusters. The biosynthesis of OTC requires three oxidoreductase steps, one at position C9 which removes the keto function, one at position C6 in the conversion of 4-keto-ATC to ATC and another at the last step [OTC dehydrogenase]. A ketoreductase has been reported previously within the otcY locus that shows stronger similarity to actIII of S.coelicolor. OtcD-ORF3 has been tentatively assigned as catalysing the last step of the pathway. OtcD-ORF4 shows good end-to-end similarity to a coding region of unknown function within the gene cluster for daunorubicin biosynthesis in S.griseus. OtcD-ORF5 is clearly defined as a potential protein coding region that shows good similarity to a small region of an open reading frame within the B.subtilis genome which again has unknown function. The B.subtilis coding region is very hydrophobic and carries a series of repeat sequences, the significance of which is not yet understood. Preliminary transcriptional analysis of this 3.0 kb KpnI23-MluI26b fragment using low-resolution S1 mapping has revealed a single transcript which encompasses OtcD-ORF3 and OtcD-ORF4. A stable stem-loop immediately after the translational stop codon of OtcD-ORF4 was located with high-resolution mapping. A potential promoter sequence was located immediately preceding OtcD-ORF5, however no transcript was detected with low-resolution mapping at the time point when the RNA was isolated

Roadmap to a PhD: Navigating the Application Process

https://scholarworks.moreheadstate.edu/student_scholarship_posters/1167/thumbnail.jp

How Sexual Abuse Interviews Go Astray: Implications for Prosecutors, Police, and Child Protection Services

This article argues that child sexual abuse interviews can go astray in two different ways: (a) improper interviewing has the potential to elicit false allegations from children, and (b) clumsy interviewing does not typically produce false allegations, but may have other negative consequences, particularly for child victims. The article clarifies the distinction between the two kinds of bad interviewing and suggests that clumsy interviewing is the more common of the two. The potential negative consequences of both improper and clumsy interviewing are described, along with implications for prosecutors, police, and child protection services. In the authors\u27 opinion, improper interviewing can probably be eliminated rather easily, but clumsy interviewing may be considerably more resistant to change