Parthenium hysterophorus, an emergent weedy plant species expands its geographical ranges in Pakistan

Parthenium hysterophorus [commonly known as Carrot grass; native to American tropics; family Asteraceae] is a flowering, short-lived perennial or an annual invasive-weedy plant. In the recent few years, the plant is spread (in epidemic proportions) vigorously, at least, in the two provinces (KP and Punjab) and the twin capital cities (Islamabad and Rawalpindi). The weed came in the lame light soon after the monsoon rains and floods of September 2012 and August 2013 that hit larger areas of KP and Punjab provinces of Pakistan. The massive boom in the weed was witnessed in areas under floods of the river Kabul and the Indus Ocean. It is speculated that after initial entry into the flood zones, the seeds then germinated and dispersed into the near and farther areas in the country, including hilly areas. The plant is categorized as a poisonous weed, and a source of skin allergies and itching. It may be a cause of increased reports of asthma, cough, fever, and allergies related to eyes in these areas [1, 2]. Due to its vigorous growth and allelopathic effects, the plant soon dominated over all other weeds and crop plants. Furthermore, it has a tremendous potential to withstand abiotic and biotic stresses. Its vigorous growth has resulted in the loss of local floral biodiversity [3]. Specifically in Islamabad, it has dominated completely the wild cannabis (weeds). However, this year, the cannabis weed seems to overcome gradually the parthenium dominance. The coming years may witness the revival of other plant species suppressed by parthenium. Although the plant seems to be resistant/tolerant to biotic stresses, very few plants were identified with leaf rolling, vein yellowing, stunting and bunchy-top like diseases, indicative of begomovirus infection. PCR amplification and sequencing confirmed a symptomatic parthenium plant positive for the viral infection (unpublished observation; Figure 2). Previously, only a single report is available of parthenium being infected with geminiviruses [4]. Currently, no weedicide is available to eradicate the weedy plant. The only available alternative is to drag the plants out of soil along with their roots before they bear seeds. The presence of the plant everywhere on barren lands, streets, along the drains, hilly terraces, orchards, in lawn grass, and in crop fields makes complete eradication almost impossible (Figure 1a-c). Increased ailment linked with parthenium like – toxicity in the livestock and insect pollinators, skin allergies in humans and reduced agricultural productivity necessitates that the government and non-government stakeholders should take stringent measures to save human health, livestock and agricultural production.

Vaping Shadows Tobacco Control: Imperatives for Malaysia

Electronic cigarettes (e-cigarettes) have been the subject of numerous debates in the literature. (Bullen et al., 2013; Cressey, 2014; The Lancet, 2013) So much discussion has been on it this year alone to the extent that the word vape, which means ‘to inhale and exhale the vapour produced by an e-cigarette or similar device’, has become the Oxford Dictionaries Word of the year. E-cigarettes have gained popularity amongst the youth who are smokers and want to quit as well as among children and adult non-smokers who fancy it. (Centers for Disease Control and Prevention, 2013; Dawkins, Turner, Roberts & Soar, 2013; Emery, Vera, Huang & Szczypka, 2014; News & Angeles, n.d.; Serrie, 2014; US Drug and Food Administration, 2014) Even in rural communities in middle- and low-income countries, their availability in shopping centres and through multilevel marketing schemes is common (I.N.S., unpublished observation/data).

Gender differences in undergraduate performance in psychiatry

Earlier research reported that female undergraduates performed significantly better than their male counterparts in medical school examinations. Such findings were partly explained by biases in admission policies with women (who formed only 25% of the student body) being higher achievers than men prior to entry to medical school. While some recent studies provide evidence of higher achievement levels by women (Norcini et al, 1985), it is increasingly recognised that these differences do not apply to all specialities within medicine (unpublished observation, Ferrier & Scott, 1987).

Morphometric Analysis of Portal Hepatocytes from Rats Treated with Compound 48/80

Compound 48/80, a mast cell degranulating agent, produces marked hypotension in the rat. Thirty minutes after intravenous treatment with compound 48/80 there is a significant increase in blood-glucose with a concommitant decrease in hepatic glycogen similar to that observed in shock-like states. Electron microscopic observations of hepatocytes from rats treated with 48/80 have shown an apparent decrease in hepatic glycogen and increase in smooth endoplasmic reticulum (SER). Mitochondria in these cells seemed to contain fewer matrix granules. The present analysis was performed to quantify these observations. Since light microscopic observations of tissue from these rats revealed an apparent greater depletion of glycogen in the portal areas (unpublished observation), hepatic portal cells were analyzed in this initial study.

Intercellular communication in the rat anterior pituitary gland: an in vivo and in vitro study

The concept of "stimulus-secretion coupling" suggested by Douglas and co-workers to explain the events related to monamine discharge by the adrenal medulla (5, 7) may be applied to other endocrine tissues, such as adrenal cortex (36), pancreatic islets (4), and magnocellular hypothalamic neurons (6), which exhibit a similar ion-dependent process of hormone elaboration. In addition, they share another feature, that of joining neighbor cells via membrane junctions (12, 26, and Fletcher, unpublished observation). Given this, and the reports that hormone secretion by the pars distalis also involves a secretagogue-induced decrease in membrane bioelectric potential accompanied by a rise in cellular [Ca++] (27, 34, 41), it was appropriate to test the possibility that cells of the anterior pituitary gland are united by junctions.

Predation on Harbour Porpoise, Phocoena phocoena, by a White Shark, Carcharodon carcharias

A specimen of the white shark, Carcharodon carcharias, brought into Leonardville, Deer Island, N.B., on August 13, 1971, contained three harbour porpoises, Phocoena phocoena, in variable states of digestion. This record on predation is discussed in conjunction with literature reports of a similar nature and one other previously unpublished observation.

Evidence of self-fertilization in certain species of barnacles

Isolated individuals of certain species of cirripedes are known to remain unfertilized at the time when the majority of contiguous individuals are carrying egg masses. From a very large number of observations on both Balanus balanoides (L.) and Elminius modestus Darwin (Crisp, 1950, 1956) there remains little doubt that in these two species copulation is necessary before eggs are brought into the mantle cavity where they are fertilized. Though fewer field observations have been made, Balanus crenatus Bruguière appears to behave similarly, isolated specimens grown on raft-exposed panels never bearing fertilized egg masses (Crisp, 1950; Barnes, unpublished observation). B. balanus (L.) (= B. porcatus da Costa) is also in all probability an obligatory cross-fertilizing hermaphrodite, though the available evidence does not exclude the possibility of self-fertilization in rare instances (Crisp, 1954; Barnes & Barnes, 1954).