Modeling of magnetic loop antenna for an improved rockets/spacecraft communication operation

the magnetic loop antenna (MLA) is a compact hf antennas used transmitting signals within a fairly long distance. Its shape and size had metaphorsize from the usual analogue to a digital device-which is now used for experiments in space. In this paper, the resolution of the bearing angle errors of the antennas on a rocket or spacecraft was proposed to enhance improved application in signal transmission. A new concept was introduced -angular displacement theory which was used to mitigate fading in multipath propagation especially from Rocket or spacecraft orbit

Validation of Genome-Wide SSR Markers Developed for Genetic Diversity and Population Structure Study in Grain Amaranth (Amaranthus hypochondriacus)

Grain Amaranth is the most promising C4 dicotyledonous pseudocereal and is distributed globally. It has an excellent nutritional profile and adaptability against a broad range of environmental factors. These traits have renewed the interest of researchers and breeders in exploring this underutilized orphan crop. The present study aimed to validate the genome-wide SSR to assess the genetic diversity among 94 Amaranthus hypochondriacus accessions using 57 genomic SSR (g-SSR) markers developed in-house. A total of 36 g-SSRs were recorded as polymorphic and amplified 138 alleles, with an average of 3.83 alleles per locus. Major allele frequency ranged from 0.29 to 0.98, with an average of 0.63 per marker. The expected heterozygosity ranged from 0.03 to 0.81, with an average of 0.46 per locus. Polymorphism information content (PIC) ranged from 0.03 to 0.79, with an average of 0.40, indicating a high level of polymorphism across amaranth accessions. Population structure analysis resulted into two major genetic clusters irrespective of their geographical origin, which suggests there may be sharing of common genomic regions across the accessions. High allelic frequency and heterozygosity levels indicate significant genetic variability in the germplasm, which can be further used in future breeding programs

Isolation of Pyrrolocins A–C: <i>cis</i>- and <i>trans</i>-Decalin Tetramic Acid Antibiotics from an Endophytic Fungal-Derived Pathway

Three new decalin-type tetramic acid analogues, pyrrolocins A (<b>1</b>), B (<b>2</b>), and C (<b>3</b>), were defined as products of a metabolic pathway from a fern endophyte, NRRL 50135, from Papua New Guinea. NRRL 50135 initially produced <b>1</b> but ceased its production before chemical or biological evaluation could be completed. Upon transfer of the biosynthetic pathway to a model host, <b>1</b>–<b>3</b> were produced. All three compounds are structurally related to equisetin-type compounds, with <b>1</b> and <b>3</b> having a <i>trans</i>-decalin ring system, while <b>2</b> has a <i>cis</i>-fused decalin. All were active against <i>Mycobacterium tuberculosis</i>, with the <i>trans-</i>decalin analogues <b>1</b> and <b>3</b> exhibiting lower MICs than the <i>cis</i>-decalin analogue <b>2</b>. Here we report the isolation, structure elucidation, and antimycobacterial activities of <b>1</b>–<b>3</b> from the recombinant expression as well as the isolation of <b>1</b> from the wild-type fungus NRRL 50135