scholarly journals Propagation of desert moss Syntrichia caninervis in peat pellet: a method for rapidly obtaining large numbers of cloned gametophytes

2021 ◽  
Author(s):  
Xiujin Liu ◽  
Ping Zhou ◽  
Xiaoshuang Li ◽  
Daoyuan Zhang
Keyword(s):  
Desiccation Tolerance ◽  
Current Knowledge ◽  
Biological Soil Crust ◽  
Body Part ◽  
Regeneration Potential ◽  
Dominant Type ◽  
Syntrichia Caninervis ◽  
Large Numbers ◽  
Ability To Regenerate ◽  
Different Parts

Abstract Background Syntrichia caninervis is a typical desiccation tolerance moss, which is a dominant species forming biological soil crust in the Gurbantunggut Desert. This study investigated the effect of different explants on regeneration potential by propagating on peat pellet. Result Juvenile and green leaves can regenerate secondary protonema within one week and shoot in half a month in peat pellet. Rhizoid has strong ability to regenerate, like leaf regeneration, the secondary protonema is the dominant type of regenerant. The process of stem regeneration is similar with whole gametophyte. Stem is the most important integral body part when propagation. The whole gametophyte is the most optimal materials for rapidly propagating. Conclusion This article improves the state of our current knowledge in desiccation tolerance moss cultivation, highlighting efforts to effectively obtain large number of gametophytes through different parts of explant. This work provides a useful resource for the research of S. caninervis as well as biocrust restoration.

scholarly journals Propagation of desert moss Syntrichia caninervis in peat pellet: a method for rapidly obtaining large numbers of cloned gametophytes

Plant Methods ◽  
2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Xiujin Liu ◽  
Ping Zhou ◽  
Xiaoshuang Li ◽  
Daoyuan Zhang
Keyword(s):  
Dominant Species ◽  
Current Knowledge ◽  
Body Part ◽  
Regeneration Potential ◽  
Dominant Type ◽  
Great Ability ◽  
Syntrichia Caninervis ◽  
Soil Crusts ◽  
Large Numbers ◽  
Ability To Regenerate

Abstract Background Syntrichia caninervis is a typical desiccation tolerant moss that is a dominant species forming biological soil crusts in the Gurbantunggut Desert. This study investigated the effect of different explants on regeneration potential by propagating them on peat pellet. Result Juvenile and green leaves can regenerate secondary protonema within one week and shoots in one-half month in peat pellet. Rhizoids have a great ability to regenerate, and similar to leaf regeneration, secondary protonema is the dominant type of regenerant. The process of stem regeneration is similar to that of whole gametophytes. Stems are the most important integral body part during propagation. The whole gametophyte is the best materials for rapidly propagating gametophyte on peat pellet. Conclusion This article improves the state of our current knowledge of desiccation tolerant moss cultivation, highlighting efforts to effectively obtain a large number of gametophytes through different explant parts. This work provides a useful resource for the study of S. caninervis as well as biocrust restoration.

BIOASSAY CHARACTERISTICS OF INDIVIDUAL URINARY GONADOTROPHIN EXTRACTS

1963 ◽  
Vol 42 (2) ◽  
pp. 214-224
Author(s):  
Raymond C. Mellinger ◽  
Jalileh A. Mansour ◽  
Richmond W. Smith
Keyword(s):  
Reference Material ◽  
Young Women ◽  
Reference Standard ◽  
General Acceptance ◽  
Modifying Factors ◽  
Large Numbers ◽  
The World ◽  
Quantitative Bioassay ◽  
Different Parts ◽  
Age And Sex

ABSTRACT A reference standard is widely sought for use in the quantitative bioassay of pituitary gonadotrophin recovered from urine. The biologic similarity of pooled urinary extracts obtained from large numbers of subjects, utilizing groups of different age and sex, preparing and assaying the materials by varying techniques in different parts of the world, has lead to a general acceptance of such preparations as international gonadotrophin reference standards. In the present study, however, the extract of pooled urine from a small number of young women is shown to produce a significantly different bioassay response from that of the reference materials. Gonadotrophins of individual subjects likewise varied from the multiple subject standards in many instances. The cause of these differences is thought to be due to the modifying influence of non-hormonal substances extracted from urine with the gonadotrophin and not necessarily to variations in the gonadotrophins themselves. Such modifying factors might have similar effects in a comparative assay of pooled extracts contributed by many subjects, but produce significant variations when material from individual subjects is compared. It is concluded that the expression of potency of a gonadotrophic extract in terms of pooled reference material to which it is not essentially similar may diminish rather than enhance the validity of the assay.

Prehistoric aboriginal occupation of the rangelands: Interpreting the surface archaeological record of far western New South Wales, Australia.

2000 ◽  
Vol 22 (1) ◽  
pp. 44 ◽  
Author(s):  
SJ Holdaway ◽  
PC Fanning ◽  
DC Witter
Keyword(s):  
Arid Regions ◽  
Aboriginal People ◽  
New South ◽  
New South Wales ◽  
Landscape Archaeology ◽  
South Wales ◽  
Large Numbers ◽  
Different Parts ◽  
Stone Artefact

Recent erosion in arid regions of western NSW has exposed large areas that are scattered with stone artefacts manufactured by Aboriginal people in prehistory. These exposures offer an opportunity for archaeologists to study the artefacts abandoned by Aboriginal people through time and to compare those artefacts that accumulate in different parts of the landscape. To reconstruct the nature of prehistoric behaviour in the rangelands, two approaches are needed. First, the geomorphological context of the artefacts needs to be considered since exposure of the artefacts is a function of landscape history. Second, large areas (measured in thousands of square metres) and large numbers of artefacts need to be considered if patterns reflecting long-term abandonment behaviour by Aboriginal people are to be identified. This paper reports on the Western New South Wales Archaeological Program (WNSWAP) which was initiated in 1995 to study surface archaeology in the rangelands. Geomorphological studies are combined with artefact analysis using geographic information system software to investigate Aboriginal stone artefact scatters and associated features such as heat retainer hearths, in a landscape context. Results suggest that apparently random scatters of stone artefacts are in fact patterned in ways which inform on prehistoric Aboriginal settlement of the rangelands. Key words: Aboriginal stone artefacts; rangelands; landscape archaeology; geomorphology; GIs

scholarly journals Note: Recording of Some Beetles in Honey Bee Colonies

2018 ◽  
Vol 51 (2) ◽  
pp. 85-90 ◽  
Author(s):  
H.F. Abou-Shaara ◽  
M.E. Ahmad ◽  
J. Háva
Keyword(s):  
Honey Bee ◽  
Honey Bees ◽  
The Other ◽  
Beetle Species ◽  
Large Numbers ◽  
The World ◽  
Bee Bread ◽  
Small Hive Beetles ◽  
Bee Colonies ◽  
Different Parts

Abstract Honey bees are very valuable to human. These social insects contribute in the pollination of many crops. Also, the products from honey bee colonies have many nutritional and medicinal benefits. Thus, keeping honey bees are very valuable and can be considered as source of income to many families. There are many diseases and pests that attack honey bee colonies. The pests attack bee colonies include: hornets, wax moths, bee-eater birds, and beetles. Such challenges can impact the survival and productivity of honey bee colonies. In this study, some beetle species belong to Fam. Nitidulidae, Dermestidae and Mycetophagidae were detected in honey bee colonies in Egypt, during spring. Despite the presence of many beetle species in the agricultural environment, only few species preferred the invasion of the colonies for feeding. These beetles do not attack stages of honey bees. They only feed on stored pollen or bee bread, especially those fallen on the bottom of the beehives. This is an alarm to follow the feeding behavior and distribution of these beetles. These beetles’ species can be considered as potential pests to weak honey bee colonies, housed in old or damaged beehives. The presence of large numbers of these beetles in weak colonies may disturb the activities of the bees and may passively impact the survival of the colonies. Listing these beetles is very important to better understanding the interaction between honey bees and beetles. On the other side, small hive beetles were not detected in the colonies. These beetles are currently one of the major problems facing honey bees in different parts of the world. This study confirms the absence of small hive beetles from Egypt.

Introduction

2017 ◽  
Author(s):  
Peter Gatrell
Keyword(s):  
Twentieth Century ◽  
Civil Wars ◽  
Major Part ◽  
Policy Makers ◽  
Internally Displaced ◽  
Large Numbers ◽  
The World ◽  
John Berger ◽  
Involuntary Displacement ◽  
Different Parts

The English writer and critic John Berger regarded the twentieth century as ‘the century of departure, of migration, of exodus, of disappearance: the century of people helplessly seeing others, who were close to them, disappear over the horizon’.1 Berger’s characterisation of ‘helplessness’ invites us to consider not only how people were rendered liable to sudden and involuntary displacement, but also how those processes were represented at the time and subsequently. Global conflicts, revolutions and civil wars have played a major part in these processes of movement and loss, exposing combatants and non-combatants to personal risk. Civilians have frequently been the chief actors in the dramas of ‘departure’ and ‘disappearance’. Massive displacement has not necessarily entailed movement across state borders, although it is only relatively recently that policy-makers have taken into account the large numbers of internally displaced persons in different parts of the world....

The case of recurrent abdominal pain in a girl

2013 ◽  
Vol 4 (4) ◽  
pp. 93-95
Author(s):  
Dmitry Vladimirovich Pechkurov ◽  
Evgeniya Nikolayevna Voronina ◽  
Yuliya Evgenyevna Allenova
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Abdominal Pain ◽  
Rare Disease ◽  
Surgical Procedures ◽  
Acute Intermittent Porphyria ◽  
Recurrent Abdominal Pain ◽  
Dominant Type ◽  
Different Parts

Abdominal pain is often occur in practice of the pediatrician and gastroenterologist. Recurrent, intense, intractable abdominal pain for several years should be a symptom of anxiety. In this article, we present a case of long-term recurrent abdominal pain in a girl, accompanied by neurological symptoms, as a symptom of a rare disease - acute intermittent porphyria. Acute intermittent porphyria - inherited by dominant type disease characterized by lesions of the peripheral and central nervous system, the most frequent symptom of which is pain in the abdomen. Abdominal pain with this disease are recurrent paroxysmal and may be localized in different parts of the stomach, leading to the setting false diagnoses, multiple hospitalizations and unjustified surgical procedures.

Studies concerning the Uptake of Contact Insecticides.

1954 ◽  
Vol 45 (4) ◽  
pp. 711-722 ◽  
Author(s):  
C. T. Lewis
Keyword(s):  
Sensory Nerve ◽  
Mechanical Damage ◽  
The Body ◽  
Tsetse Flies ◽  
Large Numbers ◽  
Gustatory Sense ◽  
Contact Chemoreceptors ◽  
Glossina Palpalis ◽  
Different Parts ◽  
Contact Insecticides

The anatomy of the tarsi and pretarsi of Phormia (Protophormia) terraenovae (R.-D.); Glossina palpalis (R.-D.) and Musca domestica L. is described with particular reference to structures possibly concerned in the action of deposits of contact insecticides. The numerous setae which cover the tarsal segments are distributed in a pattern which is common to all three species. Long spines situated at the distal extremity of each segment are the points of contact with which a fly engages a surface, and which take the thrust as the fly walks. Proximal to the primary spines are two ventral rows of chemoreceptors, protected from mechanical damage by smaller spines. In addition there are lateral and dorsal rows of bristles.Contact chemoreceptors, which have been identified by experiment, are present in large numbers on the tarsi of P. terraenovae and M. domestica. Each chemoreceptor is a differentiated hollow seta possessing an extremely thin frontal membrane of cuticle, in which a lipoid layer appears to be incorporated and through which a lipoid-soluble insecticide might readily penetrate to the sensory neurocytes.Receptors of this type are also present on the tarsi of G. palpalis, though tsetse flies have not been reported to possess a tarsal gustatory sense.The pulvilli of all three species are entirely filled with viscous endocuticle and possess neither nerves, sense organs nor gland cells. The pulvilli are probably less important sites of penetration of insecticide from deposits than are the tarsel chemoreceptors, articulating membranes of setae, and intersegmental joint membranes.Measurements of nerve diameters at different parts of the tarsi are used to interpret the results of Fisher (1952) concerning the action of DDT applied to limited areas of M. domestica. It is concluded that the relative toxicity of DDT at different parts of the body may be correlated with the number of sensory nerve fibres passing close to the site of penetration, but not with the number of sensory end organs directly affected.

scholarly journals Changes in local distribution and numbers of staging and wintering Bean Geese Anser fabalis in Scania, south Sweden 1977/1978–2016/2017

Ornis Svecica ◽  
2017 ◽  
Vol 27 (2–4) ◽  
Author(s):  
Leif Nilsson
Keyword(s):  
Small Area ◽  
Coastal Region ◽  
Local Distribution ◽  
Southern Sweden ◽  
Large Numbers ◽  
Bean Goose ◽  
South Sweden ◽  
Anser Fabalis ◽  
Global Population ◽  
Different Parts

Scania in southern Sweden is an important staging and wintering province for the Bean Goose Anser fabalis, especially for the Taiga form A. f. fabalis. Based on counts in October, November and January 1977/1978–2016/2017, and observations of neck-banded individuals, the changes in local distribution are described. When the counts started, large numbers were counted already in October, but autumn numbers steadily decreased as the geese stayed further north in Sweden. The January counts on the other hand increased as the geese wintered in Scania in successively larger numbers rather than leaving Sweden. In January 2017, more than 40,000 or two-thirds of the global population of Taiga Bean Goose were counted in Scania. Within the province, more and more geese concentrated to inland areas and instead of using the Öresund coastal region as in earlier years. Birds from different breeding areas, e.g. from Finland and Sweden, used different parts of Scania. In recent years 3000–9000 of Tundra Bean Geese Anser f. rossicus have been wintering in a small area in northeast Scania.

Do the Sexes of the Desert Moss Syntrichia caninervis Differ in Desiccation Tolerance? A Leaf Regeneration Assay

2005 ◽  
Vol 166 (1) ◽  
pp. 21-29 ◽  
Author(s):  
Lloyd R. Stark ◽  
Lorenzo Nichols II ◽  
D. Nicholas McLetchie ◽  
Mary L. Bonine
Keyword(s):  
Desiccation Tolerance ◽  
Syntrichia Caninervis

scholarly journals Mesenchymal Stem Cells: Current Concepts in the Management of Inflammation in Osteoarthritis

Biomedicines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 785
Author(s):  
Asma Abdullah Nurul ◽  
Maryam Azlan ◽  
Muhammad Rajaei Ahmad Mohd Zain ◽  
Alphy Alphonsa Sebastian ◽  
Ying Zhen Fan ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Articular Cartilage ◽  
Current Knowledge ◽  
Cartilage Regeneration ◽  
Joint Inflammation ◽  
Symptomatic Treatment ◽  
Cell Based Therapy ◽  
Ability To Regenerate ◽  
Primary Focus

Osteoarthritis (OA) has traditionally been known as a “wear and tear” disease, which is mainly characterized by the degradation of articular cartilage and changes in the subchondral bone. Despite the fact that OA is often thought of as a degenerative disease, the catabolic products of the cartilage matrix often promote inflammation by activating immune cells. Current OA treatment focuses on symptomatic treatment, with a primary focus on pain management, which does not promote cartilage regeneration or attenuate joint inflammation. Since articular cartilage have no ability to regenerate, thus regeneration of the tissue is one of the key targets of modern treatments for OA. Cell-based therapies are among the new therapeutic strategies for OA. Mesenchymal stem cells (MSCs) have been extensively researched as potential therapeutic agents in cell-based therapy of OA due to their ability to differentiate into chondrocytes and their immunomodulatory properties that can facilitate cartilage repair and regeneration. In this review, we emphasized current knowledge and future perspectives on the use of MSCs by targeting their regeneration potential and immunomodulatory effects in the treatment of OA.

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