In elucidating functionally important single-stranded loop regions derived mainly from three models in genomic hepatitis delta virus (HDV) ribozyme possessing self-cleavage activity, we have constructed several internal deletion variants of the HDV133 molecule (654-786 nt on genomic RNA) by oligonucleotide-directed mutagenesis. When self-cleavage activities were compared among variants, the HDV...

A method for measuring the real-time corrosion rates for Alloy 718, stainless steels (SS) 304L and 316L nuclear grade (NG), aluminum alloys 5052 (Al5052) and 6061 (Al6061), copper (Cu), tantalum (Ta), and tungsten (W) in two separate water systems that were irradiated by 800 MeV protons is presented. The ®rst water system was fabricated entirely of 304 SS, thoroughly cleaned before operation, a...

BACKGROUND AND METHODOLOGY In 2003, the Faculty of Family Planning and Reproductive Health Care (FFPRHC) of the Royal College of Obstetricians and Gynaecologists published guidance on emergency contraception (EC). A literature search revealed no published work describing doctors' actions when prescribing EC. In order to assess the extent to which the FFPRHC Guidance is being followed in general...

Powder injection molding of superalloys offer a potential route for the manufacture of small and geometrically complex components for the aircraft engine industry. In this investigation, 625 and 718 alloy powders with an average size below 10 pm were injection molded into tensile test bars which were then sintered in a hydrogen atmosphere at diverse temperatures after debinding. Other 718 alloy...

An experimental test was carried out to explosively clad solution annealed Inconel 718 superalloy on quench-tempered AISI H13 hot tool steel. A wavy with vortices interface geometry was obtained from this experiment. A gradual change in the wavelength along the direction of welding was observed which was due to a change in the impact angle, following the plate contacts. In this paper, the exper...

Components manufactured by laser powder bed fusion (LPBF) are limited their performance for use in critical applications. LPBF materials have microstructural defects, such as suboptimal grain size and morphology, macroscale anomalies, lack of fusion. This results components performing below wrought counterparts various mechanical properties, creep which has seldom been researched. To understand...

The lifetime of structural components of spallation targets (beam window, liquid metal container, return hull) is determined by the irradiation-induced changes of the mechanical properties of their materials. An extensive test program was initiated using specimens obtained from spent target components from operating spallation facilities (Los Alamos Neutron Science Center, LANSCE and the Spalla...

The binder plays the most important role in the metal injection molding (MIM) process. It provides fluidity of the feedstock mixture and adhesion of the powder to keep the molded shape during injection molding. The binder must provide strength and cohesion for the molded part and must be easy to remove from the molded part. Moreover, it must be recyclable, environmentally friendly and economica...

3 4 Maria Knikou 1, , Luke Dixon , Danielle Santora , and Mohamed M. Ibrahim 2 5 6 7 The Graduate Center and Department of Physical Therapy, City University of New York, NY 8 10016 9 10 11 *Correspondence to: 12 Maria Knikou, PhD 13 Graduate Center / City University of New York 14 2800 Victory Boulevard, 5N-207 15 Staten Island, NY 10314 16 Phone: 718-982-3316 17 Fax: 718-982-2984 18 E-mail: Ma...