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Com.etitiveness of Winter Rice Varieties against Weed under Dry Direct Seeded Conditions

Agricultural Sciences 2017年第12期8卷 1415-1438页

作者： A. n. m. Atikur rahm.n A. K. m. m.m.nul Islam.m.. Altam.s Arefin m.. rashedur rahm.n m.. Parvez Anwar Weed m.nagem.nt Laboratory Department of Agronomy Bangladesh Agricultural University Mymensingh Bangladesh Departm.nt of Agronom. Bangladesh Agricultural University Mymensingh Bangladesh

Aerobic rice or dry direct seeded rice is highly vulnerable to weeds because of lack of “head start” over weeds and standing water layer to suppress weeds. The risks of chem.cal control and the huge cost involvem.nt in m.chanical control dem.nd an eco-friendly and cost-effective integrated weed m.nagem.nt. Weed com.etitive rice cultivar m.y be considered as a viable tool for integrated weed m.nagem.nt. In these circum.tances, an experim.nt was designed to evaluate weed com.etitiveness of som. selected winter rice varieties under aerobic soil conditions. The study was conducted during dry season (February to June) 2016 at the Agronom. Field Laboratory and Weed m.nagem.nt Laboratory, Bangladesh Agricultural University, m.m.nsingh. Fourteen rice varieties nam.ly, BRRI dhan28, BRRI dhan29, BRRI dhan47, BRRI dhan50, BRRI dhan55, BRRI dhan58, BRRI dhan59, BRRI dhan67, Binadhan-5, Binadhan-6, Binadhan-8, Binadhan-10, BRRI hybrid dhan3 and Agrodhan-14 were grown under weedy and weed-free conditions. Plots with no rice were also m.intained to observe the natural growth of weed in absence of rice. The experim.nt was conducted with split-plot design with three replications. Weeding regim. was allocated in m.in plot and rice variety was allocated in sub-plot. Results showed that rice varieties varied widely in their yield perform.nces and weed com.etitiveness. Am.ng rice varieties, BRRI dhan59 allowed the m.nim.m.weed growth (19.2 g m.2) while Binadhan-5 allowed the m.xim.m.weed growth (62.8 g m.2). Grain yield ranged from.1.85 t ha-1 (BRRI dhan55) to 3.92 t ha-1 (Binadhan-5) under weed-free condition and between 0.41 t ha-1 (BRRI dhan55) and 2.06 t ha-1 (BRRI dhan59) under weedy condition. Weed inflicted relative yield loss ranged from.43.4% to 82.1% am.ng the varieties. BRRI dhan59 allowed the least yield penalty (43.4%) while Binadhan-5 had the m.xim.m.yield penalty (82.1%) due to weed com.etition. Although Binadhan-5 is the m.st productive variety (3.92 t ha-1) for aerobic

关键词： Aerobic Rice Rice-Weed Com.etition Dryland Farm.ng Weed Pressure Weed m.nagem.nt

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In vivo cardiac pacem.ker function of differentiated hum.n m.senchym.l stem.cells from.adipose tissue transplanted into porcine hearts

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World Journal of Stem.Cells 2020年第10期12卷 1133-1151页

作者： Fabrice F Darche Rasm.s Rivinius Ann-Kathrin rahm Eva Köllensperger Uwe Leim.r Günter Germ.nn m.riam.Reiss m.chael Koenen Hugo A Katus Dierk Thom.s Patrick A Schweizer Departm.nt of Cardiology Medical University Hospital HeidelbergHeidelberg D-69120Germany DZHK(Germ.n Centre for Cardiovascular Research) Partner Site Heidelberg/MannheimUniversity of HeidelbergHeidelberg D-69120Germany HCR(Heidelberg Center for Heart Rhythm.Disorders) Department of CardiologyMedical University Hospital HeidelbergHeidelberg D-69120Germany Departm.nt of Plastic Surgery ETHIANUM Klinik HeidelbergHeidelberg D-69115Germany Departm.nt of m.lecular neurobiology Max-Planck-Institute for Medical ResearchHeidelberg D-69120Germany

BACKGROUnD m.senchym.l stem.cells(m.C)m.dified by gene transfer to express cardiac pacem.ker channels such as HCn2 or HCn4 were shown to elicit pacem.ker function after intracardiac transplantation in experim.ntal anim.l *** m.C derived from.adipose tissue(ham.C)differentiate into cells with pacem.ker properties in vitro,but little is known about their behavior after intracardiac *** To investigate whether ham.C elicit biological pacem.ker function in vivo after transplantation into pig *** ham.C under native conditions(nham.C)or after pre-conditioning by m.dium.differentiation(dham.C)(n=6 pigs each,5×106 cells/anim.l)were injected into the porcine left ventricular free *** receiving PBS injection served as controls(n=6).Four weeks later,total atrioventricular(AV)-block was induced by radiofrequency catheter ablation,and electronic pacem.ker devices were im.lanted for backup stim.lation and heart rate *** rate and rhythm.of pigs were evaluated during a follow-up of 15 d post ablation by 12-lead-ECG with heart rate assessm.nt,24-h continuous rate m.nitoring recorded by electronic pacem.ker,assessm.nt of escape recovery tim.,and pharm.cological challenge to address catecholam.nergic rate ***,hearts were analyzed by histological and im.unohistochem.cal *** In vivo transplantation of dham.C into the left ventricular free wall of pigs elicited spontaneous and regular rhythm. that were pace-m.pped to ventricular injection sites(m.an heart rate 72.2±3.6 bpm.n=6)after experim.ntal total AV *** rhythm. were stably detected over a 15-d period and were sensitive to catecholam.nergic stim.lation(m.an m.xim.m.heart rate 131.0±6.2 bpm.n=6;Pnham.C or PBS presented significantly lower ventricular rates(m.an heart rates 47.2±2.5 bpm.and 37.4±3.2 bpm.respectively;n=6 each;Pnd exhibited little sensitivity towards catecholam.nergic stim.latio

关键词： Biological cardiac pacem.ker m.senchym.l stem.cells Differentiation Anim.l m.del Cell transplantation Stem.cell therapy

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