achillea millefolium belonging to the astreaceae family is an endangered medicinal plant of jordan and of its neighboring countries. as an alternative to seed propagation, an efficient micropropagation of a. millefolium and its subsequent rooting were developed as an option for its in vitro conservation. a maximum of 5.9 shoots per microshoot were obtained on murashige and skoog agar medium sup...

Abstract—Liquid spray heat exchanger is the critical equipment of temperature regulating system by gaseous nitrogen which realizes the environment temperature in the range of -180 °C~+180 °C. Liquid nitrogen is atomized into smaller liquid drops through liquid nitrogen sprayer and then contacts with gaseous nitrogen to be cooled. By adjusting the pressure of liquid nitrogen and gaseous nitrogen...

BACKGROUND The rate of recurrence of giant cell tumor of bone is decreased by use of adjuvant treatments such as phenol, liquid nitrogen, or polymethylmethacrylate (PMMA) during curettage. We assessed recurrence and complication rates and functional outcome after curettage with use of phenol and PMMA, liquid nitrogen and PMMA, and liquid nitrogen and bone grafts. METHODS We retrospectively co...

Article history: Received: 09.06.2015. Received in revised form: 01.10.2015. Accepted: 08.10.2015. Liquid nitrogen is expected to be used as a jet medium in petroleum engineering because of its cryogenic and non-polluting characteristics. To identify the velocity distribution characteristics of liquid nitrogen jet, a computational fluid dynamics model was built by coupling the equations for nit...

PURPOSE To evaluate the effects of new treatments with liquid nitrogen cryotherapy on some external eye conditions. METHODS In this retrospective case study, 6 separate series from a single tertiary care referral center practice are described. Liquid nitrogen cryotherapy was used to treat conjunctival amyloidosis, primary pterygia, recurrent pterygia, advancing wavelike epitheliopathy (AWLE),...

Liquid nitrogen freezing is recommended for long-term preservation of Leptospira serovars. However, there is no standard protocol to follow for this methodology. We herein report a simple procedure to preserve well-characterized Leptospira serovars unaltered for long-term storage in liquid nitrogen. Forty-three (43) leptospira strains, cryoprotected with 10% (v/v) glycerol were rapidly frozen i...

The preparation and electrical properties of high-temperature superconductor nanowire arrays are reported for the first time. YBa2Cu3O(7-delta) nanowires with widths as small as 10 nm (much smaller than the magnetic penetration depth) and lengths up to 200 microm are studied by four-point electrical measurements. All nanowires exhibit a superconducting transition above liquid nitrogen temperatu...

By WILLIAM R. BRONSON AND M .iiy H. McGINNIs5 With the technical aid of Robert J. Eisel A PANEL of erythrocytes of known antigenic structure has become increasingly important not only in experimental immunohematology but also in routine blood banking procedures. Cells kept at 4 C.’2 and glycerolated cells stored at -20 C.3’4 are frequently used for this purpose. Recently Strumia5 described a te...

With the goal of creating faster and more efficient methods of generating unique Ac/Ds insertional mutants in a population of Fragaria vesca, various methods of seed germination, kanamycin screening, and the effects of varying nitrogen fertilization on diploid strawberry have been examined. Seed germination was improved to 42% in B5 liquid medium compared to _ on MS solid medium. Kanamycin scre...