Planetesimal formation by the streaming instability in a photoevaporating disk

Recent years have seen growing interest in the streaming instability as a candidate mechanism to produce planetesimals. However, these investigations have been limited to small-scale simulations. We now present the results of a global protoplanetary disk evolution model that incorporates planetesimal formation by the streaming instability, along with viscous accretion, photoevaporation by EUV, FUV, and X-ray photons, dust evolution, the water ice line, and stratified turbulence. Our simulations produce massive (60-130 $M_\oplus$) planetesimal belts beyond 100 au and up to $\sim 20 M_\oplus$ of planetesimals in the middle regions (3-100 au). Our most comprehensive model forms 8 $M_\oplus$ of planetesimals inside 3 au, where they can give rise to terrestrial planets. The planetesimal mass formed in the inner disk depends critically on the timing of the formation of an inner cavity in the disk by high-energy photons. Our results show that the combination of photoevaporation and the streaming instability are efficient at converting the solid component of protoplanetary disks into planetesimals. Our model, however, does not form enough early planetesimals in the inner and middle regions of the disk to give rise to giant planets and super-Earths with gaseous envelopes. Additional processes such as particle pileups and mass loss driven by MHD winds may be needed to drive the formation of early planetesimal generations in the planet forming regions of protoplanetary disks.Comment: 20 pages, 12 figures; accepted to Ap

The Socioeconomic and Ecological Impact of Cool Season Forage Production: A Case of Black Belt Counties, Alabama

Abstract Raising livestock during the lean season of forage production has become a great challenge for small and limited resource farmers because of a high cost involved in procuring supplementary feed. This study was conducted to assess the impact of cultivating cool-season forages on the feeding costs for meat goats and cattle. Three case studies were conducted in three Black Belt Counties of Alabama, Russell, Dallas, and Bullock. The socioeconomic and ecological impacts of developing cool-season pastures were evaluated using the before versus after assessment approach. The findings revealed that all three cooperator farmers reduced costs of procuring hay and supplementary feed after establishing cool-season forages, on average $917 for two goat farms and$4,152 for a beef cattle farm. It is believed that an extensive outreach on forage production would help small and limited resource livestock farmers boost their farm income. Keywords: Socioeconomic Impact, Ecological Impact, Cool-Season Forage, Year-round Pasture, Alabama Black Bel

Anthelmintic Activity of Trikatu Churna and its Ingredients

The alcoholic extract of Trikatu churna and its ingredients were evaluated for anthelmintic activity. The dried fruits of Piper nigrum L. (Piperaceae), Piper longum L. (Piperaceae) and rhizome of Zingiber officinale Roscoe. (Zingiberaceae) were powdered and mixed together in equiproportions to get a polyherbal formulation, Trikatu churna. All these three ingredients are spicy, commonly used in our daily diet, also well known for their tremendous therapeutic potential, since from the Vedic period. The alcoholic extract of Trikatu churna and its ingredients were screened for preliminary phytochemical studies and also tested for anthelmintic activity against Pheritima posthuma and recorded the time taken for induction of paralysis and death. Piperazine citrate (10 mg/ml) was included as standard reference and distilled water as control. The results demonstrated that, the extracts of Trikatu churna and its plant ingredients showed the presence of alkaloids, flavonoids, tannins, lignins and steroids, these test samples were also exhibited potent anthelmintic activity, but the highest activity was noticed in Trikatu churna, this might be due to the multifunctional effect of all the three plant ingredients of Trikatu churna. Based on the above results, it is confirmed that, combination of Piper nigrum, Piper longum and Zingiber officinale in Trikatu churna offered promising anthelmintic effect than using the ingredients alone

Invitro Antimicrobial Activity and Phytochemical Analysis of Ficus religiosa L. and Ficus bengalensis L. against Diarrhoeal Enterotoxigenic E. coli

The barks of Ficus religiosa L. and Ficus bengalensis L., which belongs to family Moraceae, were investigated for invitro antibacterial activity and phytochemical analysis. The various solvents extract like aqueous, methanol, chloroform, petroleum ether and hexane were screened for antibacterial activity against Enterotoxigenic E. coli isolated from diarrhoeal patients. The preliminary phytochemical analysis of the methanol extracts of both the plants showed the presence of carbohydrates, flavonoids, aminoacids, steroids, saponins and tannins. The extracts were subjected for antibacterial activity against Enterotoxignic E.coli (ETEC) at 200mg/ml concentration by disc diffusion method. The results of antibacterial activity revealed that methanol extracts of both the plants barks exhibits good activity compared to chloroform and aqueous extracts. Petroleum ether and hexane extracts did not show any activity. The antibacterial activities of extracts were compared with standard antibiotics

A STUDY OF ARTHAVAVAHA SROTAS WITH SPECIAL REFERENCE TO MAITHUNA ASAHISHNUTHA (DYSPAREUNIA)

Understanding the science of Ayurveda is based on proper concept of Tridosha – the Vata, Pitta and Kapha, as these form the physiological control factors. Prakruti, the biological or genetic constitution to a great extent influences each individual, in the way he is, the way he behaves, the way he reacts to certain things there by making a person unique and distinct from one-another. Acharya Sushruta the pioneer in the field of Shareera has gone through evaluating the anatomical structures under the name of Sroto-Shareera, which includes Srotas of Ahara, Dhatu, Mala and Upadhatu like Arthavavaha Srotas. Arthavavahasrotas gets originated from Garbashaya and Arthavavaha Dhamani injury to Arthavavahasrotas results in Vandhyathva, Nastarthava and Maitunaasahisnutha. In his purview it is the local injury to organs of reproductive system which may be due to excessive coitus, repeated curettage, LSCS and thereby, which may result in pelvic adhesions, local infections, tubal block, etc. ultimately leading to Maithunaasahishnutha (dyspareunia). In this study 20 women who were diagnosed as Maitunaasahisnutha selected for assessment of predominant Prakruti based on physiological and anatomical triats. From the statistical analysis it is evident that Kaphaprakruti were more prone for Maithunaashasinutha

Editorial : Genetics of familial hypercholesterolemia: New insight-Volume II

Non peer reviewe